Primary water stress corrosion cracking (PWSCC) has been concerned in Bottom Mounted Instrumentation (BMI) of Reactor Pressure Vessel with alloy 600 for the last two decades. Generally the Rules on Fitness for Service for Nuclear Power Plants of JSME are applied for flaw evaluation after detecting defects in the operating nuclear plants. However in the case that a crack is detected in a complex configuration area such as J-groove weld, it is needed to perform a fracture mechanics approach using FE ana...
英字タイトル:
Approach for Improvement of maintenance technology of BMI

This paper introduces a recent activity for revision from 2008 ed. of JSME Rules for Fitness for Service, mainly Evaluation chapter. The main revision points are 1) Introduction of the flaw acceptance rule of Class 1 components into Class 2 and 3 piping, 2) Introduction and arrangement of new K-solution equations, and 3) Development of a new code case for a flaw acceptance rule and K-calculation guideline for J-grooved weld of a bottom mounted instrument nozzle for cap-repair. These revisions and devel...
英字タイトル:
Recent activity for revision of JSME Rules on Fitness for Service (Evaluation chapter)

When Repair and Replacement Process (RRP) for maintenance of facilities of operating nuclear power plants is applied based on the construction code, many difficulties may arise because of spatial or radioactive restriction compared to doing for facilities under construction. For this reason, industries have been developed maintenance technologies and provided guidelines and codes for the repair for the facilities of operating plants under those restricted conditions. But, in fact, these guidelines and ...
英字タイトル:
Codes and Standards in Repair and Replacement Process : Status and Issues