Russian rocket accident releases radiation

[gleem]

Radiation monitoring stations near the accident have stopped reporting their measurements suggesting that the accident may be more serious. Russia remains paranoid about releasing information about uncontrolled discharges of radioactive material. There is even a report that workers in the hospital that treated survivors were not told that the patients were contaminated. They were also asked to sign non disclosure agreements.

https://www.businessinsider.com/russia-covering-up-nuclear-accident-at-nyonoksa-2019-8

 

[berkeman]

There is even a report that workers in the hospital that treated survivors were not told that the patients were contaminated.

If true, that is just plain wrong, IMO.

 

[Astronuc]

Radiation monitoring stations near the accident have stopped reporting their measurements suggesting that the accident may be more serious.

I heard about that this afternoon. Apparently the accident was Aug 8, and by Aug 10, two of the CTBTO monitoring stations were turned off, then three more further away were turned off.

https://www.reuters.com/article/us-...ent-offline-after-mystery-blast-idUSKCN1V9183
https://www.rferl.org/a/russian-nuc...fuels-fears-extent-deadly-blast/30119174.html

 

[mfb]

Russia to nuclear test ban monitor: Test accident not your business

https://www.reuters.com/article/us-...test-accident-not-your-business-idUSKCN1VA0OL
One of the the dead stations is transmitting again.

Radiation monitoring stations near the accident have stopped reporting their measurements suggesting that the accident may be more serious.

Not necessarily. It can also mean that studying the nuclide distributions could give some indications how the weapon was designed and tested.
Reported levels outside Russia are really small, the radiation levels outside the testing site are probably not that high.

 

[artis]

@berkeman not telling someone something that they should otherwise under any normal circumstances know is exactly how everything is done in this part of the world. Trust me I know, same thing only on a larger level was back in the USSR, now it has decreased simply because the global information exchange capabilities have skyrocketed compared to the 1980's for example, thanks to internet and capable cell phones. So say this happened back in 1986, unlike Chernobyl which was simply too big to hide this would have been hidden better than a needle in a haystack, there would never be a thread of this type.
I believe China has the same exact policy towards secrecy and maybe some other countries do as well.
It's a philosophical issue because the value of human life is very low as seen here unlike seen in the western world

 

[artis]

If indeed the missile is a torpedo like mentioned here before I suppose then the reactor could be very simple and not have to use any liquid metal cooling etc?
But even for an surface to air missile if it had a nuclear reactor as the heat source why would one want to use liquid metal as coolant? Doesn't that simply add an unnecessary weight and complexity given that the final product which needs heating is air so why not heat it directly by some heat exchange from the core to the by passing air?
Given it's a missile that carries a warhead meant for a thermonuclear detonation does one really worry about some minor radioactive pollution along the way to the target?

 

[Baluncore]

But even for an surface to air missile if it had a nuclear reactor as the heat source why would one want to use liquid metal as coolant?

The liquid metal is a heat exchange fluid. It cools the core while it heats the jet air.

 

[artis]

yes I know it's a heat exchange fluid but again why not use air directly to cool the fuel? they did that in Windscale

The only reason I can think up at the moment is that a highly enriched core has rather small surface area so the passing air probably couldn't keep the temps low enough for safe operation of the reactor so that it lasts long enough so maybe the liquid metal then circulates through a much larger heat exchanger wit large surface, could this be the case?

 

[Baluncore]

could this be the case?

That is the case. It permits different contact areas for the two heat exchangers.

 

[geoelectronics]

I heard about that this afternoon. Apparently the accident was Aug 8, and by Aug 10, two of the CTBTO monitoring stations were turned off, then three more further away were turned off.

https://www.reuters.com/article/us-...ent-offline-after-mystery-blast-idUSKCN1V9183
https://www.rferl.org/a/russian-nuc...fuels-fears-extent-deadly-blast/30119174.html

Help me out here, I'm a little confused. Someone posted this link in this thread earlier:
https://www.abc.net.au/news/2019-08...-arms-depot-at-russian-military-base/11386418

https://www.abc.net.au/news/2019-08...-kills-two-sparks-radiation-concerns/11398604

Inside is a video with this caption:
Video: The rocket explosion comes days after a fire at a military ammunition depot in Siberia. (ABC News)

Is this the same incident? The video shows a populated town and metnions the accident was at a military ammunition depot?

Thanks

Geo

 

[Baluncore]

Is this the same incident?

No, two different events.

5 Aug 2019. Ammunition and explosives storage, Lat 56.173310° Long 90.399937°. Kamenka, 10 km south of Achinsk. No radiation. Many pictures, some wrongly attributed. When google Earth updates that area, the storage facility will look different.

8 Aug 2019. Platform in Dvinskiy Gulf, White Sea. No pictures or details available. 5 people reported dead. Radiation released. It appears that Nyonoksa was the closest military test facility to the accident, but Nyonoksa was not involved in the trials, nor could it have provided access to the platform. The Nyonoksa reference appears to be Russian misinformation.

 

[geoelectronics]

No, two different events.

5 Aug 2019. Ammunition and explosives storage, Lat 56.173310° Long 90.399937°. Kamenka, 10 km south of Achinsk. No radiation. Many pictures, some wrongly attributed. When google Earth updates that area, the storage facility will look different.

8 Aug 2019. Platform in Dvinskiy Gulf, White Sea. No pictures or details available. 5 people reported dead. Radiation released. It appears that Nyonoksa was the closest military test facility to the accident, but Nyonoksa was not involved in the trials, nor could it have provided access to the platform. The Nyonoksa reference appears to be Russian misinformation.

Thanks for clarification.

Geo

 

[artis]

yup that link was a bit fake news, they write about one story and put a video from a totally different one and unrelated , I assume to make the whole story sensational.
They do that with ordinary things like car crashes everyday, putting a deadly wreck when writing about a traffic bump.

 

[Astronuc]

Russian President Vladimir Putin speaks during a joint news conference with Finnish President Sauli Niinisto in the Presidental Palace in Helsinki, Finland, August 21, 2019
https://www.reuters.com/article/us-...red-during-weapons-systems-test-idUSKCN1VB1YC
Apparently Putin acknowledged that "a deadly blast at a military site in northern Russia earlier this month had taken place during the testing of what he called promising new weapons systems." Of course, he will not elaborate on the system, but simply minimize the consequences, especially concerning the release of radioactive substances.

 

[mfb]

A more detailed analysis by Norway: Probably two explosions two hours apart, the second one was in the air and that's what released the radiation.

https://www.reuters.com/article/us-...-says-idUSKCN1VD1DR?__twitter_impression=true

 

[anorlunda]

Probably two explosions two hours apart

Oh wow. Now we have a real mystery. If a missile exploded in the air, what was the earlier explosion? If the first explosion was the missile, what was still in the air an hour later?

The Russians are good at concealment, but most of their secrets leak out eventually.

 

[artis]

@anorlunda , oh trust me most of their secrets are lost to history and no one is talking about them, I know because only the ones who live "here" and have had a common past in the USSR know, the ones that leak are the really nefarious ones, sadly so many atrocities are still unknown.

This on the bright side was just a technical mishap and both Russians and Americans as well as others have had plenty of them, I guess trying to conceal them is a standard practice. The real crimes are the ones against humanity and sadly on this side of the pond we have had too many.as for the thread topic, well wasn't it the case that these nuclear ramjets need to get to some minimum airspeed first in order to generate a strong enough thrust?because I can't imagine how one could start a rocket that has no expanding hot gasses but simply a very hot heat exchanger sitting in ambient air, in that case maybe the chemical propellant that was used to give the rocket it's firs boost exploded when it launched and some of the rocket got away and then exploded in air together with the secondary nuclear engine, or is this completely wrong?

PS. quite frankly with as little info as we have all we can do is speculate

 

[Rive]

If a missile exploded in the air, what was the earlier explosion?

... and how got the staff contaminated?

maybe the chemical propellant that was used to give the rocket it's firs boost exploded when it launched and some of the rocket got away and then exploded in air together with the secondary nuclear engine...

I had a similar speculation a bit back here, but the time difference seems to be two hours (!). At any relevant flight speed that's quite a big distance.

 

[Borg]

There is even a report that workers in the hospital that treated survivors were not told that the patients were contaminated.

If true, that is just plain wrong, IMO.

Looks like the Russians are going back to their old playbook. When all else fails, make up something - no matter how ridiculous.
Russian officials blame cesium exposure on 'Fukushima crabs'

Despite the doctor's exposure to patients from an area where a short-term radiation spike was recorded, the local health ministry blamed the trace amounts of the isotope on bad seafood.

"Cesium-137... has the feature of accumulating in fish, mushrooms, lichens, algae," the statement posted on the local government's website reads. "With a certain degree of probability, we can assume that this element got into the human body through the products of food."

 

[etudiant]

It is very difficult to tie these two accidents together, especially given the Norwegian assessment that the second explosion was airborne. The claim that the radioactivity was detected after the second explosion is unhelpful. There is quite a distance between the test site and the Norwegian sensors, so we would need wind speeds and direction to give some plausible time line.
We know at least 5 senior researchers were killed and that their bodies were contaminated. That indicates a ground based accident, perhaps a reactor burping because a pipe gave way. Whether a reactor with that kind of damage could still power a flight vehicle for a couple of hours is doubtful, but not impossible, as Russia's military greatly prefers robust and overdesigned gear. It is unlikely that the initial failure was just a booster issue, because of the contamination of the victims. However, it is also difficult to understand why a leak in metal cooled reactor would cause an explosion sufficient to contaminate and blow overboard the observers.

 

[mfb]

There is quite a distance between the test site and the Norwegian sensors, so we would need wind speeds and direction to give some plausible time line.

That's what they did, I guess. Otherwise the statement would be silly.

No matter where radiation was released the two explosions are strange. If a large explosion happens you stop testing unless you are absolutely sure the explosion has nothing to do with the test. Two independent accidents on the same day at the same place? Sounds unlikely. Maybe the second explosion was caused by an attempt to contain the damage of the first one.

 

[Baluncore]

Does anyone have wind data for the White Sea for the 8 August, and for the region since then?

There is some confusion over the light wind direction at the time. Was it blowing south, a south-wind or a southerly wind? From the delayed and then canceled order to evacuate Nyonoksa I got the feeling that, at the time of the accident the wind at the test platform was blowing towards the NW, away from Nyonoksa and Severodvinsk. An expected wind change did not occur, or radiation products did not continue to be released, so the evacuation was cancelled.

My current hypothesis is that a static test on a platform in the middle of Dvinskiy Gulf continued normally for about two hours. The four times increase in gamma background over Severodvinsk was generated by the reactor, unshielded, (apart from the molten lead alloy coolant that screened some gamma radiation). I guess the radiation monitors in Severodvinsk that did not register the increase were screened by local topography from the the radiation source low on the NW horizon.
A critical explosion ended the experiment. It generated the burst of over 16 times normal background in Severodvinsk. It destroyed the operator / observer shelter on the platform.

That is the simplest explanation I can see for the radiation levels monitored, with the two distinct phases of operation, or modes of release, ending in one physical explosion due to a reactor accident.

 

[mfb]

Air is a great shield against gamma radiation over distances of kilometers, the radiation length is about 300 meters. Direct radiation shouldn't be relevant anywhere outside the test site, it is all about released radioactive materials.

 

[artis]

Now this morning I thought about something I think hasn't been mentioned here.
Any missile ever that has taken off from land or sea has gone somewhere right? So if you launch a missile you also have to recover it or let it fall down as is usually done when testing new missiles with the latest exceptions of Falcon etc where they try to reuse it to increase it's commercial viability.
Now suppose you have a chemically launched nuclear in flight powered ramjet type of a missile , so you launch the missile and what then? You essentially have a speeding nuclear "dirty bomb" even without a warhead in place that flies at mach 2 or greater speeds , where do you land such a test missile??
You can't let it crash in international waters or neighboring countries for the risk of giving away your secrets and pollution and an international scandal, so you crash it somewhere silent and remote in your own territory and which country in the world has the biggest luxury of having a place like that... Russia ofcourse.

You see where I am going with this?

Now I will try to give some links later, but right now here is my thinking.
The Russians already have a working chemically launched nuclear missile but they are tweaking it and probably testing a good enough recovery mechanism for the rocket. Because having a rocket like this also requires some way of recovering it if used in peacetime.

Also what strikes as odd is the place of test because the Russians have even more remote areas like the famous "Nowaya Zemlya" or "New Land" which is a large very far north located land mass that is virtually empty of humans or other "intruders" , also the place where they tested the largest thermonuclear bomb ever the "Tsar" bomb.
It has been reported that they have made some tests of this same 9M730 missile there and close by among other things have been a special nuclear waste and radiology ship named "Serebryanka"

Now guess what? I found on some Russian blogs that at the latest spot in the Dvinsky gulf the same ship has been spotted hours before reports of any explosion took place. Now thinking logically the Russian scientists are among the best in the world surely they would take some backup precautions while testing a nuclear powered missile.
PS. a flashback they would have also told the operators of the RBMK units of how dangerously unsafe they were when used in a low power range but they were not allowed to do so.

Also someone there posted a link to a police escort of some 3 and more ambulances with drivers in full bio-suits and the cars themselves wrapped in plastic film. Now this doesn't seem like an accident to me but a planned emergency in case the rocket dumping goes wrong.
So here is what I think they did, another test fire of the rocket, but as in all other cases they needed a safe spot where to dump the rocket after flight tests were done, probably something went wrong in the trajectory of the rocket and they now had a nuclear missile heading for civillian territory so they activated the emergency self destruct function of the missile and it blew up in mid air near the towns where the short spike in radiation was noticed. (I suppose they have such controls built in such a rocket as it would only seem logical)
I think they probably would have wanted to dump the rocket in sea originally and do it in a controlled fashion and then the specialists could pick up the remains (why the special purpose ship Serebryanka was there)
but as they blew it up the remains of it crashed near the platform (not sure what it's purpose was) and in the result some people were killed.
As @mfb and others said here earlier the only radiation that could travel far enough from source for a short time is gamma, so maybe the gamma background was elevated because of the disintegration of the rocket some 40km from the shore , as the fragments fell into sea the gamma background dropped as the source of radiation was now not only far away but mostly underwater or covered.Surely without any normal information this is just speculation but to me it seems highly probable.

 

[artis]

The information about the vessel "Serebryanka" is very scarce , the only thing know about it is that it belongs or has to do with the Russian official state owned nuclear energy company Rosatom's nuclear ship fleet, as most things in Russia they serve dual purposes , a civilian one and a clandestine military one, such is also Rosatom as it operates both civilian power reactors and arctic ice-breakers as well as takes part in military drills such as this one.

It is called a "nuclear fuel carrier" but reportedly has also carried radioactive waste and contaminants from secret military experiments that involve nuclear materials like the tests of the 9M730 missile.
No surprise this ship was spotted near this latest test site.

 

[Astronuc]

There is some confusion over the light wind direction at the time. Was it blowing south, a south-wind or a southerly wind? From the delayed and then canceled order to evacuate Nyonoksa I got the feeling that, at the time of the accident the wind at the test platform was blowing towards the NW, away from Nyonoksa and Severodvinsk. An expected wind change did not occur, or radiation products did not continue to be released, so the evacuation was cancelled.

The wind may have been blowing eastward, and possibly NE to SE. I went looking for some archive wind data, but it's not easy to find. I did find some data on the jet stream, but it only goes as far as Finland.

http://virga.sfsu.edu/archive/jetstream/jetstream_atl/big/1908/19080812_jetstream_atl_anal.gifhttp://virga.sfsu.edu/archive/jetstream/jetstream_atl/big/1908/
Apparently, satellites image the atmosphere, and there are archives of wind/cloud motion over much of the earth. Ostensibly, there is satellite imagery from UK, Norway, Sweden, and/or Finland, and perhaps Germany. I have seen satellite imagery from NOAA, but I can't find the specific satellite at present.

On August 8/9, there was a low pressure system over Sweden and Finland, so if the pressure was greater over White Sea, then the winds would probably blow westward or to SW.

 

[gleem]

Just a reminder the specification for wind direction is the direction of origin. So a north wind is blowing south, and east wind is blowing to the west.

 

[Astronuc]

Western media report that a Russian agency, Rosgidromet, has reported finding several radioactive isotopes in samples it took following a recent accident at a northern military base during a weapons test.

Rosgidromet said a cloud of inert radioactive gases formed as a result of a decay of the isotopes and was the cause of the brief spike in radiation in Severodvinsk.

The isotopes were Strontium-91, Barium-139, Barium-140, and Lanthanum-140, which have half-lives of 9.3 hours, 83 minutes, 12.8 days, and 40 hours respectively, it said.

From https://www.rferl.org/a/russian-wea...e-isotopes-found-after-accident/30129439.html

https://www.cbsnews.com/news/russia...isotopes-government-reveals-today-2019-08-26/
https://www.foxnews.com/world/russia-nuclear-missile-explosion-radioactive-isotopes-test-samples.amp

 

[Baluncore]

Rosgidromet is the Russian meteorological bureau.

Put yourself in the position of having to test a nuclear powered jet cruise missile and a nuclear powered torpedo. The submarine needed to launch the torpedo is not available yet so you need test facilities. I expect a nuclear powered missile would initially be tested on a static stand with a modified turbojet engine to provide the ram airflow. The combined thrust would require the test rig be fixed.

We can see with Google Earth (6/23/2010 attached), increased activity in the Severodvinsk shipyards during 2010 and 2011. A jack up platform is being modified. Wind the clock back to see (in front of the unrelated refit of the aircraft carrier Admiral Kuznetsov), a wide floating platform being progressively assembled from modular units. The floating platform outer edge has a white glacis plate, with cut corners. Judging by the length of the shadows you can see the superstructure on the floating platform is higher than the deck of the aircraft carrier. The middle section was assembled first, covered with a central structure.

I think the jack up platform was being modified for testing the 9M730 Burevestnik cruise missile, and became the site of the recent explosion. I think the floating platform is the accommodation and facilities for testing the sister project, the Poseidon nuclear powered torpedo and the launch system.

Where are those platforms now? My best guess is based on marine navigation charts that show three special purpose buoys located at 65.225135°, 38.814129°. That is out in the middle of the Dvinskiy Gulf, White Sea, an area not imaged by Google Earth. That area is ideal for testing both of those weapons systems.

 

[mfb]

US intelligence suggests Russia was fishing Putin's doomsday missile out of the sea when it mysteriously exploded

That sounds plausible. They test the missile, an explosion is recorded (intentional or not), the missile ends up in the ocean. Two hours later they recover it, something goes wrong, there is another explosion that releases some radioactive material.

 

[artis]

Well this (if true) would confirm my previous speculation that Russians already have a flying 9M730 cruise missile and have flown this missile multiple times before only in different locations (Novaya zemlya) , so this time they launched the missile as usual and something (unknown reason at this point) caused it to explode in mid air or as it was being dumped int he ocean/sea. After all test missiles just like other ones need to land somewhere eventually.
So they probably then went on to the recovery of the missile which is the reason why the special radiological ship Serebryanka was there.
Again what happened exactly after they tried to recover it is again an unknown at this point.

 

[Baluncore]

Ship tracking shows SEREBRYANKA in Murmansk, not in the White Sea.
Last movement reported was cryptic and short;
MMK ATD : 2019-08-30 08:57 LT (UTC+3)
KYT ETA : 2019-08-30 11:00 LT (UTC)

 

[artis]

Well I know we are in the age of information but I don't think that you can track the movement of Russian military hardware from a typical end user accessible internet site that easily. The information could be wrong.
By this I am not saying that it was definitely Serebryanka , maybe it was some other specialized ship they have , but one is clear they had to have some marine equipment there because they intentionally dumped the rocket after flight into water.

I would think spy agencies like CIA and Mossad etc know more about what happened but it seems this is none of our business so far given how little has been made public about the incident.

 

[BillTre]

Here is a more detailed report, similar to what @mfb posted.
They mention that:

• there were two explosions: one on board the ship that was retrieving the missile from the bottom and one after that involving the item being retrieved
• a cause and effect relationship is implied between the two explosions: the ship board explosion disrupted the retrieval, which in turn is hypothesized to have caused a control rod to fall out of the reactor core, leading to a fissile "event".
• a column of water raising from the ocean was seen by some fisherman near the presumed retrieval craft.
• locals told to stay away from flotsam that might wash ashore.

 

[artis]

Ok, let's assume the missile flies, they test it several times this time in this region, but according to the article it happened some time earlier not this august, ok fine. So they dump the missile in the sea at the end and then go after it. Even though why can't they use a parachute or something like that? Maybe they dump it into sea because dumping it on land would pose the risk of destruction and contamination.Maybe someone more informed about nuclear maths here could elaborate, if the explosion was indeed caused by the missile reactor (seems most likely) then could it have been as strong as the few assumed eyewitnesses say?
They probably use highly enriched U for the reactor much like in the small research reactors (90 something %)
So if the reactor design is such that it can keep itself together under high pressures for long enough in the event of criticality it could blast off much like a small A bomb right?PS. the article also says that it could be a warhead but I highly doubt that as why would they needed to dump a warhead in the sea in the first place as I assume in testing ranges for missiles they don't equip them with actual bombs, the bombs are tested elsewhere on their own.

Another interesting moment is if the missile exploded due to a nearby explosion disrupting the reactor in the missile then what could have been there on a recovery platform that can explode with such force.

 

[mfb]

A nuclear reactor won't become prompt critical for any relevant amount of time. It might be able to explode, but only with energies of the order of a chemical explosion at most.

So they dump the missile in the sea at the end and then go after it. Even though why can't they use a parachute or something like that?

Maybe they did?

 

[Baluncore]

The picture at the head of the link in post #84, shows a damaged container on a platform. One end of the container has been destroyed by a relatively small explosion, less than 100 kg TNT equivalent. The pictures in that article appears to come from the shore just north of the Nyonoksa test site. I see no evidence that they have been faked.
Lat: 64.654958° Long: 39.155973°

The closest Nyonoksa launch pad near there had a large tower removed and has a new shed with what appears to be a sliding cover. Again there are also a couple of blue shipping containers. Maybe that is now the launch site for the cruise missile. It seems to be aimed to the west, over land.
Lat: 64.651221° Long: 39.173062°
It is only 2.5 km from Nyonoksa village.

 

[artis]

Well given the platform haven't sunk and seem only partly damaged I would also agree that indeed maybe the reactor went prompt and caused a small scale explosion. The height of the water column reported by the fisherman are probably exaggerated if not entirely false and there is no realistic way of confirming most of the information presented in the link anyway so I'll assume that the platforms are real and some explosion happened near them.
I wonder apart from a reactor going critical what else could explode on a recovery platform like that, I doubt they bring extra explosive/flammable substances with them just for fun.

such a nuclear missile would need probably a chemical startup fuel, I wonder what kind of fuel they use for that because in the past Soviets used hypergolic rocket fuels in a lot of their missiles.

 

[anorlunda]

Ok, let's assume the missile flies, they test it several times this time in this region,

My assumption would be that such a cruise missile is not reusable. So tested several missiles, but not several tests with the same missile.

such a nuclear missile would need probably a chemical startup fuel, I wonder what kind of fuel they use for that because in the past Soviets used hypergolic rocket fuels in a lot of their missiles.

In today's world, wouldn't it make more sense to use solid boosters analogous to NATO's JATO? It would also make sense to jettison the startup stage as soon as it was spent.

 

[Baluncore]

My assumption would be that such a cruise missile is not reusable. So tested several missiles, but not several tests with the same missile.

That appears to be the case as there seems to be no direct or simple way of returning missiles from the recovery platform to the launch site.

Recovery of test units for material diagnosis, reactor material salvage and cleanup is necessary. The planned landing zone must be in the water close to the launch site and control centre, or the recovery platforms would not have been beached nearby.

I expect recovery and salvage is managed through Severodvinsk.

 

[Rive]

My assumption would be that such a cruise missile is not reusable. So tested several missiles, but not several tests with the same missile.

In this particular case I think it is possible to design the test device to be reusable (with limits, of course). It is just the matter of mass spent on a biological shield. As long as the burnup of the onboard reactor is (very) low the radiation might be within manageable limits (after a cooldown period, spent underwater?).

 

[Steelwolf]

From what I have been seeing on this all, I do not think they were using 'Ramjet' tech as that is tricky enough, even though they are the leaders in that area, but consider a solid, closed permanent heat source for a turbine driven jet, mass of fissiles with a singe moderating rod. One may need to use a normal fuel to get initial takeoff speed, but once in the air it becomes a constant temperature adjustment for the speed, but other than that no fuel needed other than the fissile materials and the air going through, being compressed and then heated by the heat exchanger rather than burning fuel to expand the air.

Dirty bomb just being, let alone in use.

 

[anorlunda]

In this particular case I think it is possible to design the test device to be reusable (with limits, of course). It is just the matter of mass spent on a biological shield. As long as the burnup of the onboard reactor is (very) low the radiation might be within manageable limits (after a cooldown period, spent underwater?).

I was thinking of the non-nuclear factors that might make a very short life. For example,

Separately, the Russians have had extensive experience with liquid metal cooled reactors, which can operate at much higher temperatures than any water cooled design. Such a reactor would be a plausible heat source for a nuclear powered missile. Afaik, one of their main problem is that the metal coolant, usually lead or some lead/bismuth alloy, is prone to dissolve the pipes in which it runs.

The mission of a cruise missile needs only a few hours lifetime. Making the design lifetime several times longer for the purpose of test flights is a big change. See the comparison to Saturn V in #49.

 

[mfb]

See the comparison to Saturn V in #49.

For reference:

The main fuel pumps in the Saturn V rocket had a design life of 200 seconds. 120 seconds of that was used in two pre-flight tests, and 60 seconds during the actual launch, leaving 20 seconds spare lifetime. My point is that components considered permanent in ordinary applications, can be considered consumable in short life applications like a missile.

The first stage of Saturn V burned for ~150 seconds and the other stages burned even longer, so I have some doubts about these numbers. Can you try to find the sources? Because I didn't find anything.

 

[Rive]

The mission of a cruise missile needs only a few hours lifetime. Making the design lifetime several times longer for the purpose of test flights is a big change.

That's okay, but:
- military hardware is expected to be sturdy by default. Not a Saturn which was just erected there and fired: you (your ship) should be able to carry it around in battle
- especially so that this case it's not that easy to clean up the mess if something goes wrong, so extra reserve is expected
- and, most importantly: a test flight in this case (with the displayed distances) is likely around a few (few dozen at most) minutes, compared to the expected few hours lifetime.

 

[artis]

I see no reason why the nuclear missile that the Russians seem to have (we can only guess at what point of readiness) can't stay up in air for a prolonged time, because a nuclear reactor can last a rather long time (at least conventional ones do) and so long as the temperatures don't exceed material limits and the rocket doesn't hit it's target why couldn't it buzz over in the sky given it has it's heat source and due to its large speed has it's cooling in place all the time.

@anorlunda I wasn't implying that it's the same rocket, I simply meant that based on the info we have so far it seems they have done multiple test flights with such rockets.

I would suppose that they are working on a safe landing/dumping of the missile given under operational conditions it would have not only an active reactor but also nuclear warheads on board I'd say safely landing the thing is even more important than having it in the first place.Imagine it lifts off to its target in a war situation but suddenly west declares peace with east and now you need to quickly get rid of your flying apocalypse, landing on foreign territory is too dangerous and landing in your own if something goes wrong has the risk of "friendly fire" or blowing up your own country by accident, so they better get the cancel button damn right.

 

[essenmein]

Bit late to this thread, but been following this semi keenly via news.

Re the Poseidon torpedo, I would have thought this would be more or less based on conventional nuclear sub technology?, ie nuclear electric drive? I would think "silent running" would be key to avoid detection, so would have thought any sort of direct boiling of sea water would be too noisy? Didn't they also have a nuclear accident on a submersible or was that something else.

Re the nuke ramjet, I am not certain they would be ready to risk actual flight tests? I kind of assumed it was a stationary test. Perhaps the double explosion could be something went wrong, they failed to contain it properly, then something really went wrong?

 

[Astronuc]

Foreign Policy examines A Mysterious Explosion Took Place in Russia. What Really Happened?
https://foreignpolicy.com/2019/08/12/russia-mysterious-explosion-arctic-putin-chernobyl/