報告書番号

383010

タイトル（和文）

地下式原子力発電所における原子炉建屋および機器配管系の耐震性の検討－その１ＢＷＲ型炉－

タイトル（英文）

STUDY ON EARTHQUAKE RESISTANCE OF REACTOR BUILDING, EQUIPMENT AND PIPING SYSTEM OF UNDERGROUND NUCLEAR POWER PLANT (1) -BWR TYPE REACTOR-

概要 （図表や脚注は「報告書全文」に掲載しております）

地表面下１００ｍの地下空洞に建設されたＢＷＲ型炉１１０万ＫＷ級の地下式原子力発電所の原子炉建屋および機器配管系の耐震性を評価する目的で，地下空洞周辺地盤と原子炉建屋・機器配管系との連成振動応答解析を行った。そして，原子炉空洞壁と原子炉建屋外壁とを剛結させることによって，フリーにした場合に比較して，岩盤側壁の制震効果のため，外壁，シェル壁，格納容器の地震時応答が著しく減少することがわかった。以上，地下式原子力発電所における原子炉建屋および機器配管系の耐震上，特に問題はないと判断された。今後，更にＰＷＲ型炉についても検討し，現在の地上式原子力発電所に比較して地下式原子力発電所が耐震性に有利であることを実証していく予定である。

概要 （英文）

THE SEISMIC INTERACTION ANALYSIS BETWEEN THEREACTOR BUILDING IN THE CAVERN AND THE ROCK MASS AROUND THE UNDERGROUND CAVERN HAVE BEEN CARRIED, FOR THE PURPOSE OF ESTIMATING THE EARTHQUAKE PROOF OF THE REACTOR BUILDING, EQUIPMENTS AND PIPING SYSTEMS OF THE UNDERGROUND NUCLEAR POWER PLANT WITH 1100MWE BWR TYPE REACTOR WHICH IS INSTALLED IN THE UNDERGROUND CAVERN AT 100M DEPTH UNDER THE GROUND SURFACE. AND THE FOLLOWING RESULTS WERE OBTAINED. 1) FIXING THE OUTER WALL OF THE REACTOR BUILDING TO THE UNDERGROUND CAVERN DECREASES REMARKABLY THE RESPONSE OF THE OUTER WALL OF THE REACTOR BUILDING, THE SHELL WALL AND THE REACTOR VESSEL BY THE EFFECT OF THE SURROUNDING ROCK MASS. 2) THE DESIGNS OF THE REACTOR BUILDING HAVE NO PROBLEM, BECAUSE SHEAR STRESSES AND AXICAL STRESSES OF THE MAIN ELEMENTS ARE LESS THAN THE ALLOWABLEVALUES. 3) MOST OF THE RESPONSE VALUES OF THE MAIN EQUIPMENTS ARE LESSTHAN THE ALLOWABLE VALUES. THE OTHER HAND, SOME OF THEM ARE A LITTLE MORE THAN THE ALLOWABLE VALUES. BUT, AS THE COUNTERMEASURE FOR THIS SITUATION IS EASY, IT IS CONSIDERED THAT THERE ARE NO PROBLEMS FOR THE EARTHQUAKE PROOF DESIGN. 4) IT WAS OBTAINED THAT CONSIDERABLE HEAVY EARTHQUAKE LOADS ACT TO THE PIPING SYSTEM IN THE REACTOR VESSEL OF THE MAIN PIPING SYSTEMS. BUT IT IS CONSIDERED THAT THE PROBLEMS CAN BE COPED WITH BY CHANGING PIPING SUPPORTS, SUPPORT CAPACITIES ETC.

報告者

キーワード