REACTOR CORE MOLTEN MATERIAL HOLDING DEVICE AND NUCLEAR REACTOR CONTAINMENT VESSEL

PROBLEM TO BE SOLVED: To provide a reactor core molten material holding device and a nuclear reactor containment vessel which are capable of much more stably cooling and holding reactor core molten materials.SOLUTION: A reactor core molten material holding device 15A, which is provided in a pedestal 12, and cools reactor core molten materials M resulting from melting of a reactor core 13 in a nuclear reactor pressure vessel 14 while retaining them on a holding surface 32, includes: a cooling passage 35 through which a coolant 25 passes so as to cool the reactor core molten materials M; first risers 34A, connected to a supply side of the coolant 25, of the cooling passage 35; and second risers 34B, connected to a discharge side of the coolant 25, of the cooling passage 35. The first risers 34A and the second risers 34B are arranged circumferentially along an inner peripheral surface of a pedestal sidewall 17 so that positions in a circumferential direction of the first risers 34A are different from those of the second risers 34B.SELECTED DRAWING: Figure 2 【課題】炉心溶融物をさらにより安定して冷却し、保持することができる炉心溶融物保持装置および原子炉格納容器を提供する。【解決手段】炉心溶融物保持装置１５Ａは、ペデスタル１２内に設けられ、原子炉圧力容器１４内の炉心１３が溶融して生じた炉心溶融物Ｍを保持面３２で保持して冷却する炉心溶融物保持装置であって、炉心溶融物Ｍを冷却するために用いる冷却材２５が通過する冷却通路３５と、冷却通路３５の、冷却材２５の供給側に連結された第１ライザー３４Ａと、冷却通路３５の、冷却材２５の排出側に連結された第２ライザー３４Ｂと、を具備してなり、複数の第１ライザー３４Ａおよび第２ライザー３４Ｂがペデスタル側壁１７の内周面に沿って、第１ライザー３４Ａおよび第２ライザー３４Ｂの周方向における位置が異なるように周状に配列されてなる。【選択図】図２