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

Bare metal visual examination (BMV) is required for dissimilar metal welds of class 1 component for PWR (Pressurized Water Reactor) in inspection and evaluation guidelines published by Japan Nuclear Safety Institute (JANSI). However, there have been no guidelines which specify the procedures for BMV. In 2021, the guideline stipulating specific procedures for BMV were established by JANSI. This guideline includes both lessons-learned related to the boric acid corrosion on reactor pressure vessel upper head a...
英字タイトル:
Establishment of Bare Metal Visual Examination Guideline for Class 1 Pressure Vessels such as Reactor Pressure Vessel