Session: 01-05: Nuclear Plant Operation, Modification, Life Extension, Maintenance and Life Cycle - V
Paper Number: 134982
134982 - Key Technologies Research for the Implementation of In-Service Inspection Strategies Optimizing for the Reactor Coolant System of M310 Unit Nuclear Power Plants
Abstract:
At present, the construction code for in-service M310 units nuclear power plants in China is RCC-M, and the in-service inspection code is RSE-M. According to the code requirements, a periodic hydrostatic test of reactor coolant system is required every ten years. The implementation of periodic hydrostatic test increases the time of refueling and overhaul, and reduces the economic efficiency of the nuclear power plant. The feasibility study of implementing system leakage testing instead of the periodic hydrostatic test in M310 unit nuclear power plant has been completed in the early stage. The integrity of the pressure boundary can be verified by combining system leakage testing after refueling overhaul combined with appropriate in-service inspection strategies. Based on the previous research results, this paper focuses on the application research of periodic hydrostatic test and in-service inspection strategy optimization for a M310 unit nuclear power plant. Key technical research during the application implementation process has been carried out and completed. By carrying out a comparative analysis between the RCC-M and ASME codes for nuclear power plant construction, the applicability analysis study of the in-service inspection code switching from RSE-M to ASME has been completed. According to the material, the structure and other characteristic parameters of the main equipment of the nuclear power plant, the applicability analysis of the ASME Volume XI acceptance criteria has been carried out. The analysis of pressure boundary differences between the system leakage test and periodic hydrostatic test of the reactor coolant system has been completed, and the alternative testing scheme for nuclear safety class 1 components that cannot be verified by the leakage test has been determined. The strength and fatigue analysis of the nuclear safety class 1 pipelines of the reactor coolant system and related systems has been carried out, and the in-service inspection scope and specific requirements of the pipeline welds has been determined. The analysis and evaluation of the effect of the cancellation of periodic hydrostatic tests on power plant operation documents has been carried out. The analysis and evaluation of the impact of the cancellation of periodic hydrostatic tests and the optimization of the application and implementation of in-service inspection strategies on related system equipment has been carried out and completed. Finally, the optimization of the in-service inspection strategy for the M310 nuclear power unit reactor coolant system has been implemented, and the periodic water pressure test for the reactor coolant system is cancelled. The in-service inspection strategy for the reactor coolant system equipment has been determined in accordance with ASME Section XI and relevant regulatory requirements.
Presenting Author: Feng Deng Chengdu Hezong Nuclear Power Engineering Co., Ltd
Presenting Author Biography: Deng Feng is a senior engineer at Chengdu Hezong Nuclear Power Engineering Co., Ltd. He obtained a master's degree. His research focuses on the design of nuclear power plant system and equipment and related technical services.
Authors:
Yunhai Shen Chengdu Hezong Nuclear Power Engineering Co., LtdFeng Deng Chengdu Hezong Nuclear Power Engineering Co., Ltd
Yongqiang Duan Chengdu Hezong Nuclear Power Engineering Co., Ltd
Xiaoquan Yu Chengdu Hezong Nuclear Power Engineering Co., Ltd
Shuixiang Ye Chengdu Hezong Nuclear Power Engineering Co., Ltd
Key Technologies Research for the Implementation of In-Service Inspection Strategies Optimizing for the Reactor Coolant System of M310 Unit Nuclear Power Plants
Submission Type
Technical Paper Publication