Following up this article..Burnt motor of coolant system for reactor4
Tepco found a problem of insulation with the back up pump, they stopped it in the morning of 6/5/2012 as well.
Tepco states they will fix it within 6/6 2012, but Nuclear and Industrial Safety Agency commets it will take 3 days to fix.
Ms. Tanioka, a Democratic Party member of the House of Councilors tweeted like these below,
福一４号機の冷却機能について、今保安院と話しました。以下、報告です。６／４に警報でプールの２つの冷却ループ（１次、２次）をつなぐポンプが止まり、点検でモーターとケーブルの接合部に焼けこげが見つかる。このA系ポンプの修理のためにB系をスイッチオン。（続く）
— 谷岡郁子さん (@kunivoice) 6月 6, 2012
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Talked to NISA about the coolant system of reactor4. Here is the report..on 6/4 the pump to connect the first cooling circulation and the second cooling circulation alarmed to stop, they found burnt mark on the termina of motor and cable. To fix this circulation (A), they turned on the back up circulation (B).
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(Tanioka removed only this tweet. This tweet is the most important.)
They checked the back up circulation (B) just in case, then they found the weakness of insulation between the motor and cable as well. They could see the metal part through the insulation part. For the risk of short circuit, they stopped (B) to fix as well. They estimate 3 days to fix.
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続２）現在４号機の冷却は中断しています。水温は約３５度。１時間あたり0.3度の上昇を見込んでいる。３日では５７度程度になる可能性。保安規定によるクリティカルポイントは６５度に設定。単純な作業で修理にかkっているのでそれ以上にならないと思われると保安院。（続く）
— 谷岡郁子さん (@kunivoice) 6月 6, 2012
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The coolant system of reactor4 is stopped at this moment. The temperature of water is 35℃. They assume it increases by 0.3℃ hourly. It will be about 57℃ in 3 days. The safety regulation is 65℃. NISA explains, it’s simple work, it won’t take longer than 3 days.
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続３）この冷却停止に至った原因として保安院は、「設備が急ごしらえであるため」としている。これを本格的な設備に順次置き換えていく計画。１−３号機も同様で、同じ危険があるのでは、という質問に対し、肯定らしき返答。つまり、怖い話。引き続き状況を注視します。
— 谷岡郁子さん (@kunivoice) 6月 6, 2012
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NISA explained the reason of these troubles is because the coolant system is improvised preparation. They plan to replace them with better preparation. For the question that reactor 1 ~3 have the same risk. they did not deny the possibility. This is something to concern. I will keep my eyes on it.
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At 11:00 6/6/2012, the temperature of SFP4 is already 40℃.
Iori Mochizuki