| 摘要 |
PROBLEM TO BE SOLVED: To provide a monitoring test piece of a reactor pressure vessel which has a characteristic that when stress of a specific level corresponding to the operation state works in high temperature region not causing brittle fracture and when temperature lowers to a region possible to cause brittle fracture, stress lowers to a level not causing brittle fracture, and a method for monitoring/evaluating the degradation in the reactor pressure vessel by using the test piece. SOLUTION: A recess part 23 is provided to one side of a test piece body 16a, a notch 24 is continuously provided on the bottom of the recess part 23. A stress adding function member 26 is inserted in the recess part 23. The test piece body 16a and the stress adding function member 26 are arranged in this state in a reactor, so that a load works on the test piece body 16a during temperature elevation in the reactor and thus degradation of materials used in the reactor pressure vessel 1 can be historically monitored. COPYRIGHT: (C)2005,JPO&NCIPI
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