METHOD AND DEVICE FOR MONITORING STRESS CORROSION CRACKS

摘要

PPROBLEM TO BE SOLVED: To provide a method of monitoring stress corrosion cracks capable of accurately determining the occurrence probability of stress corrosion cracks. PSOLUTION: Electrodes 1a, 1b and 2 of the stress corrosion cracking monitor 18 are arranged in core water near a structural member coming into contact with the core water of a nuclear power plant. Stress is applied to the electrode 2. An electrometer 5 for inputting a voltage signal between the electrode 1a and electrode 2 determines potential noise. A zero shunt ammeter 6 for inputting a current signal flowing between the electrode 1b and electrode 2 determines current noise. The potential noise and current noise are converted into digital signals by an A/D converter 7, and are input into a personal computer 8. The personal computer 8 determines void moving speed Jm' of an oxide film on the surface of the electrode 2 based on both noise information. Using the void moving speed Jm', and the correlation between the previously determined void moving speed Jm' and SCC occurrence probability, the SCC occurrence probability of the structural member coming into contact with the core water of the nuclear power plant is determined. PCOPYRIGHT: (C)2009,JPO&INPIT