[Analysis] The sudden blackout revealed the weakness of Fukushima plant, “Reactor4 has 4 days to go”[Analysis] The sudden blackout revealed the weakness of Fukushima plant, “Reactor4 has 4 days to go”
In the evening of 3/18/2013, Fukushima plant had the power blackout and the coolant system of reactor1, 3 and 4 lost power.
(cf, [Breaking] Power blackout in Fukushima plant, coolant system of the pools in reactor 1,3,4 lost power [URL 1])
Here I would like to explain what the problem is and what was newly revealed.
What exactly happened ?
At 18:57, the plant lost power. Even the seismic isolation building, where is the managing office of the entire plant lost power temporarily. The reason of the blackout is not identified yet.
Tepco is receives the power from Tohoku-epco, but they can’t send it to the spent fuel pools.
■ Systems out of power
Kurion -a cesium adsorption system
Coolant system of the spent fuel pool in reactor1, 3, 4
Coolant system of the common spent fuel pool
■ Systems not out of power
Reactor coolant system for reactor1, 2 and 3
Monitoring posts
Gas monitoring systems for reactor1, 2 and 3
Coolant system of the spent fuel pool in reactor2
(Source)
At 5AM in JST, the power is not back on yet.
What is the concern ?
“According to Tepco”, the water temperature of the pool of reactor4 was 25℃ at 16:00 of 3/18/2013. It increases at 0.1 ~ 0.3 ℃/h, so it takes 4 days to reach 65℃, which is the safety regulation.
However, the common pool also lost the power, where has 6377 fuel assemblies. From the research of Fukushima Diary, the temperature increases the second fastest to follow reactor4. [URL 2]
Tepco didn’t announce how long it takes to reach the safety regulation.
Source:
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