What if it happens again?

Sometimes the government gets concerned about nuclear safety, especially after a disaster happens. Hence, this perhaps unusual request.

複数の断層、連動の揺 れ評価へ 東海第２原 発

経済産業省原子力安全・保安院は１７日、日 本原子力発電に対し、同社の東海第２原発（茨 城県）周辺にある複数の断層が連動することを 想定し、地震の揺れを再評価するよう指示し た。

連動の想定を求めたのは東海第２原発の海側 にある「Ｆ１断層」や原発北方の陸側にある 「車断層」。再評価後の揺れが、耐震設計で想 定する最大の揺れ（基準地震動）を上回れば、 原子炉の重要施設がそうした揺れに耐えられる かについても評価を求める。

福井県の美浜原発や高速増殖炉「もんじゅ」 周辺の断層についても、これまでに連動の想定 を求めた断層とは別の複数の断層についても連 動を評価するように求めた。

http://www.47news.jp/CN/201208/CN2012081701002267.html

Towards an estimate of shaking of multiple fault lines moving together at Tokai #2 Reactor

The Ministry of Economy, Trade, and Industry’s Nuclear Safety and Security Agency directed Japan Nuclear Power Company to re-evaluate earthquake impacts based on hypothetical linked tremors in multiple fault lines around the Tokai #2 Reactor in Ibaraki Prefecture. The scenario that was requested is the linked movement of the F1 Fault which is on the seaward side of the #2 Reactor and the Wheel Fault on the shore to the north.

After re-evaluation of the tremors, if the largest hypothetical tremor (for a standard earthquake) exceeds the design limits of resistance to seismic activity of the reactor, NSSA is also seeking an evaluation of the ability of the reactor’s critical facilities to withstand such a tremor.

The ministry is also seeking similar evaluations of the impact of linked movement in multiple fault lines not previously hypothesized of fault lines around the Mihama Reactor and the Fast-breeder reactor “Monju” in Fukui Prefecture.