METHODOLOGY ON AGEING MANAGEMENT REVIEW FOR MAINCOMPONENTS AND STRUCTURES OF A PWR NPP

摘要

According to the requirements of NNSA, for Chinese operational NPPs periodical safety review (PSR) shouldbe carried out every 10 years. Ageing management is one of the important safety factors to be reviewed. Entrustedby Qinshan Nuclear Power Plant (QNPP), Shanghai Nuclear Engineering Research and Design Institute (SNERDI)carried out the ageing management review (AMR), as a part of the first PSR of QNPP, from 2001 to 2003. Thispaper summarizes the methodology of the AMR process, including screening of critical components and structures,identification of main ageing mechanisms and their indicators and the tabulated review process, etc. 15components and structures, hereafter referred as equipments, were selected as review objects based on theirsignificance of safety, replaceability and cost-benefit considerations. To these objects, the main ageingmechanisms and relevant ageing indicators were identified according to specific working and environmentalcondition, design and manufacture information, operation and maintenance history, etc. The review can be dividedinto two parallel parts, the review for specific equipment and the review for overall management procedures andtheir implementation. To typical components, such as RPV and SG, fatigue analysis based on operational transientaccounting was carried out to observe the actual safety margins. Through the review, the weaknesses in ageingmanagement and potential threats to structural integrity were identified and thus continued improvement can bemade in the next period of 10 years.