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2011-03-20

〔原発NEWS〕 「4号炉プール」 密封チューブ 停電で密封 破れる UCSが可能性を指摘

 「憂慮する核科学者たち(UCS)」原子力安全プロジェクトのデイヴィッド・ロクバウム氏は会見で、「4号炉」の「使用済み燃料プール」の側面についているとみられる、燃料棒出し入れ用の「ドア」(あるいは「ゲート」)の隙間を密閉している、自転車のゴムチューブのようなものに対する空気の注入が、事故に伴う停電で止まり、隙間の密封が破れて、冷却水の漏洩が起きたのではないか、との見方を語った。

 There were reports yesterday of a possible breach in the Unit 4 spent fuel pool. Water can leak from the pool from evaporation or boil-off. Water can also simply drain out of the pool. The spent fuel pools are large swimming pools but with one key difference: One side of the spent fuel pool has a large door that's about 20 feet tall and about three feet wide. This door, also called a gate, is removed during refuelling to allow spent fuel to be transferred underwater from the reactor core into the spent fuel pool and to allow fresh fuel to be transferred from the spent fuel pool back into the reactor core. We understand that these doors, also called gates, have been installed. When installed, there's a bicycle inner tube-like device that goes around each side and bottom of the gate where it connects with the spent fuel pool wall. The loss of power following the earthquake and tsunami meant that there was no air flowing to these inflatable seals. When inflated, these seals provide a leak-tight fit between the gate and the spent fuel pool wall so leakage does not occur. When deflated, water could be leaking past the edges of the gate out of the spent fuel pool, so that any make-up water would have to replenish the boil-off, the evaporation, and any leakage through this and other pathways. The primary problem on Unit 4 is the spent fuel pool and the need to get water back into it and restore cooling.

  ⇒ http://www.ucsusa.org/nuclear_power/nuclear_power_risk/safety/nuclear-crisis-japan-telepress-transcript-03-19-11.html 

 大沼:原発のメカに詳しくて書いているわけではありません。これはあくまでも参考用、ということです。

Posted by 大沼安史 at 12:21 午後 |

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