SAFETY EVALUATION OF DELAMINATED CONTAINMENT DOME REENGINEERING

摘要

Delamination of the inner (primary) containment dome of the Kaiga Atomic power project, Unit-1 occurred duringrnconstruction. The containment dome delamination was investigated in detail. Subsequent to the investigation of therndelamination phenomenon, re-engineering (re-design and re-construction) of the dome was initiated. Methodology for safetyrnevaluation of re-design and re-construction of the IC dome was suitably devised based on the outcome of the investigationrnwork and the same was implemented. Emphasis was laid, during safety evaluation, on the safety of existing ring beam,rndevelopment of review basis for re-engineered dome, design review and quality assurance in design, quality assurance ofrnmaterials used, examination of constructibility with the new design, and quality assurance of construction of the reengineeredrndome. The inner containment structure was accepted after the successful pre-commissioning proof (structuralrnintegrity) and leakage rate tests.