russ_watters said:
Could you be more specific as to what the program said, Cliff_J - I studied the TMI incident in school and the conclusion I drew is that the incident shows how safe nuclear power is.
Sure, here's what I remember.
General maintenence ends up causing something to go wrong. Ok, no big problems.
Pressure builds up and a safety vent allows excess pressure to escape. Still no problem.
Safety vent sticks but light in control room goes out as computer merely tells them the signal was sent and not the position of the valve. The pressure drops allowing more coolant to evaporate and temperature rises.
Somewhere in the operator training to never let the reactor "go solid" by completely filling with water and the vibrating pumps from low water level the operators drop the control rods and completely shut off flow of water.
Designers are unreachable by phone, NRC is unable to get in as only one phone line exists and all they get are busy signals.
Power company lies to NRC and public (repeatedely) and downplays extent of problem (no idea on timing here, memory fuzzy). The lies told here seem to be only one step shy of the Soviet government's intial lies about Cherynobl but I digress.
Designers of reactor finally get through and tell operators to turn on water, forget the "go solid" or not just get some water in there to get temperature down. Temp gauges only go to 700F but reactor is at 4000F and reaches china syndrome at 5000F and has been sitting without coolant for 15 hours. Estimates are that 30-60 mins more without coolant would have been threshold for meltdown.
Carter sends out a direct person from NRC to run the show, finds that now the long running reaction has filled containment room with lots of H2 that could easily explode. Some NRC people thinks its nearly critical, others think its days away. Carter flies out and makes on-site visit since he trusts his man and has experience with nuclear subs in navy. Later NRC people find mistake in calculations and find H2 is days away from critical.
One person tries to go in and finds water inside reactor that is to be pure is actually green and bubbling, holding a beaker of it for a few minutes would have killed him and that he measured 10,000 REMs which they said was a lot. Nothing besides robots has gone into building since.
So here is my short list of issues I compiled from the show:
- Poor training where 'go solid' was placed above meltdown
- unclear control interface (light that goes out regardless of valve position)
- gauges that do not allow monitoring of temperature (although if its that hot shouldn't common sense overrule 'go solid'??)
- no CC cameras at all to see vent or inside the reactor or even the flooded basement as the vent leaked out the water
- one phone line
- no direct communication to designers
Obviously I've left stuff out and maybe got a couple things out of order but anyways it didn't paint a real safe picture of what happened. The message of the shows was that ignorance, complacence, and confidence in technology leaves us vulnerable to failures. They mentioned that the promise was that nuclear power was suppossed to produce electricity so cheap that it wouldn't make sense to meter it. The series of shows went on to feature the Kursk as the sign the russian military lacked the funds to maintain an advanced sub and the space shuttle as a sign that NASA implemented policies that placed frequent missions over the safety of the crew.
The NRC and all nuclear facilities are suppossed to have learned from the mistakes made and implemented changes to make things safer. But 3MI and Chernobyl are separated only be severity and luck in the historic TV shows I've seen and this show shocked me at how close we came to a meltdown.
Cliff