ＢＷＲ・ＬＯＣＡ条件下の４ｉｎ．口径パイプホイップ試験 オーバーハング長さの効果

Abstract

Pipe whip tests or jet discharge tests have been performed at the Japan Atomic Energy Research Institute, which simulate the instantaneous guillotine break of primary coolant piping in nuclear power plants. This paper describes the results of the 4-inch pipe whip tests (RUN 5407, 5501, 5504, 5603), under the BWR LOCA conditions, which were performed from 1979 to 1981. The test pressure was 6.8MPa and test temperature 285°C. In these tests, clearance was kept constant at the value of 100mm and overhang lengths were 250, 400, 550 and 1, 000mm, respectively.The main purpose of these tests is to investigate the effect of overhang length on pipe whip behavior. From the tests results, the pipe movement is effectively limited by the restraints if the overhang length is 250mm or 400mm. The deformation of the test pipe and restraints becomes large with increasing overhang length. It is clarified that the test pipe collapses at the setting point of the restraints with the overhang length more than 900mm.