JP2016003955A5

JP2016003955A5 -

Info

Publication number: JP2016003955A5
Application number: JP2014124412A
Authority: JP
Filing date: 2014-06-17
Publication date: 2016-08-18
Anticipated expiration: 2034-06-17

Description

（２）非常時
原子炉格納容器８内の温度が通常運転時より上昇するとともに原子炉圧力容器１内の水位が通常運転時より低下するような非常時は、バランス弁１２及び仕切り弁１３Ａ，１３Ｂを開状態に切換える。具体的には、例えば原子炉圧力容器１内の水位が有効燃料頂部（ＴＡＦ）近傍まで低下するか、若しくは原子炉格納容器８における基準圧力導管４Ａの貫通部（ペネトレーション）の高さまで低下したときに、バランス弁１２及び仕切り弁１３Ａ，１３Ｂを開状態に切換える。そして、図２で示すように、原子炉圧力容器１内の水位が基準圧力導管４Ａの分岐部９の高さより低下すれば、基準圧力導管４Ａの分岐部９より上端部側の水がバランス管１１及び水位圧力導管５Ａを介し原子炉圧力容器１に流出して、基準圧力導管４Ａの分岐部９での水面高さｈ２となる。基準圧力導管４Ａの分岐部９から基準圧力導管４Ｃの下端部（言い換えれば、差圧計７）までの部分は、原子炉格納容器８の外側に位置するので、原子炉格納容器８内の高温による影響をほとんど受けない。そのため、基準圧力導管４Ａの分岐部９の水面高さｈ２を一定に保つことが可能である。 (2) Emergency In the case of an emergency in which the temperature in the reactor containment vessel 8 is higher than in normal operation and the water level in the reactor pressure vessel 1 is lower than in normal operation, the balance valve 12 and the gate valve 13A, Switch 13B to the open state. Specifically, for example, when the water level in the reactor pressure vessel 1 drops to the vicinity of the effective fuel top (TAF) or to the height of the penetration portion (penetration) of the reference pressure conduit 4A in the reactor containment vessel 8 The balance valve 12 and the gate valves 13A and 13B are switched to the open state. Then, as shown in FIG. 2, if the water level in the reactor pressure vessel 1 falls below the height of the branch portion 9 of the reference pressure conduit 4A, the water on the upper end side from the branch portion 9 of the reference pressure conduit 4A is balanced with the balance pipe. 11 and the water level pressure conduit 5A to the reactor pressure vessel 1 to reach the water surface height h2 at the branch portion 9 of the reference pressure conduit 4A. Since the portion from the branch portion 9 of the reference pressure conduit 4A to the lower end portion (in other words, the differential pressure gauge 7) of the reference pressure conduit 4C is located outside the reactor containment vessel 8, it depends on the high temperature in the reactor containment vessel 8. Little affected. Therefore, it is possible to keep the water surface height h2 of the branch part 9 of the reference pressure conduit 4A constant.