Japan Earthquake: nuclear plants

nikkkom

Betas do not penetrate fuel cladding.

zapperzero

So, in your considered opinion spent fuel rods do not give off beta?

nikkkom

Spent fuel rods certainly emit beta particles.
Even my desk emits beta particles.
I probably need to run away in terror?

zapperzero

You probably need to educate yourself a bit (just how many beta particles? what yields?) and maybe just maybe consider a change of tonality. This one is rather grating.

I_P

Thanks for that translation Tustsuji, I hope they make some progress with their inquiry and are able to resolve some of those outstanding questions - or at least shed some additional light.

Regarding the earthquake damage - I recall reading that there were radiation alarms set off before the tsunami arrived and as the "remaining questions" list shows the state of the cooling apparatus immediately following the earthquake remains in doubt.

Clearly also there are unresolved issues about the source of hydrogen that fueled the explosion at unit 4.

I_P

dbl post again - must remember to explicitly log in before trying to post a reply. Any help on guidelines/tips for posting images to the thread would be appreciated.

tsutsuji

http://www3.nhk.or.jp/news/genpatsu-..._chikasui.html Heeding to a remark by a Nuclear Regulaton Agency officer, Tepco performed a more precise measurement of the groundwater intended for release into the sea. In the past, Tepco said that the cesium 137 concentration was lower than the detection threshold. Now Tepco is providing a measurement of 0.39 Bq/l . This is lower than Tepco's internal standard of 1 Bq/l and lower than the legal requirement of 90 Bq/l. There is no prospect of starting the releases as the local fishermen have been resisting. Tepco said "we are going to politely explain to the local inhabitants that this is lower than our internal standard".

What do you want to know ? If the picture is on your computer, you may use the "manage attachments" button below the edit box. If the picture is online you may type the image URL and insert it between [ I M G] [/ I M G] tags (or click on the icon above the edit box).

I_P

This is the image I tried to post on the previous page showing the spike in emissions after march 20th:

Attached Thumbnails

 

I_P

"manage attachments" worked. I tried the url and [ I M G ] tags last time and it didn't seem to work for me. Thank you Tsutsuji

tsutsuji

http://www.asahi.com/national/update...306040838.html The NRA released two pictures of the inspection on unit 1's 4th floor.

http://www3.nhk.or.jp/news/genpatsu-...10_koukai.html They took hundreds of pictures and a 40 minute long video. Maximum exposure was 4.8 mSv. Results of this inspection will be announced at the second study group meeting.

http://www3.nhk.or.jp/news/genpatsu-...10_koukai.html A patrol found a leak from an above-ground tank at 00:15 PM today. The rate was about one drop every 3 or 4 seconds. The leak was stopped about 4 hours later as a result of tightening bolts and transferring part of the water to another tank. The total amount is about 1 l.

http://www.tepco.co.jp/nu/fukushima-...30605_08-j.pdf Leakage from flange of G6 area tank (cylindrical metallic tank)

turi

Wooo. Yet another visit and video of unit one's 4th floor. I still don't know what they were looking for during the last two visits but I find them fascinating.

a.ua.

What can you learn in 15 minutes.?

Sorry, but this is ridiculous.
No one checked the availability of water in the tanks themselves, checked only tool the water.

In addition, it is clear that the valve (outside) need to be opened by hand, very quickly.
03.11.2011. Just 1.5 hours was in stock.
then on top of the reactor accumulated non-condensable gases and end all.
the condenser air pocket, it does not work.............
.

I_P

I think the idea was to photograph and record video of relevant areas and to analyze the pictures after the fact. They had specific questions so the photography should have been well targeted.

We will see what they come up with.

tsutsuji

http://www3.nhk.or.jp/news/genpatsu-...kenshutsu.html Tritium and strontium were found above the legal levels set for sea releases, in measurement wells on the sea side of unit 2. Tepco says the cause could be the April 2011 high radioactive water leaks. Tepco will reinforce the sea bank so that the water doesn't pour into the sea, and dig additional monitoring wells.

http://www3.nhk.or.jp/news/genpatsu-...619/index.html nearby seawater radiation levels are stable.

http://www3.nhk.or.jp/news/genpatsu-...920_okure.html The disclosure of this well contamination problem has been two weeks late, as Tepco was aware of it as soon as 31 May 2013. However the Tepco headquarters in Tokyo learnt about it only on 11 June. The time taken to reach the management and to wait for the strontium analysis results (strontium analysis requires time) resulted in the disclosure on 19 June.

http://www3.nhk.or.jp/news/genpatsu-...moushiire.html Fukushima prefecture sent a formal request to Tepco to analyse the cause and prevent sea release.

http://www.tepco.co.jp/en/nu/fukushi...30619_03-e.pdf Results of Groundwater Quality Survey at the East Side of the Turbine Building at Fukushima Daiichi NPS