Standard study of the technology and safety performance evaluation on Emergency Core Cooling System Strainer

Emergency Core Cooling System (ECCS) strainer is the important equipment to ensure the effective and safe operation of ECCS, Containment Spray System (CSS) and the Cavity Injection System (CIS) etc. after PWR NPP accidents. Strainer equipment design technology, test technology and relevant core cooling safety evaluation technology are important design and research work of nuclear power projects, and also one of the important contents of nuclear safety review. In the past decades years, many countries have done a lot of research work in this field, and made great efforts to solve related nuclear safety issues. However, there is still a lack of a complete set of international standards to guide research, design and safety performance evaluation work related to ECCS strainer. Therefore, it is necessary to establish a set of standards covering the performance evaluation of ECCS strainer in accordance with the requirements of nuclear safety regulation, combined with the research results and engineering practices of NPPs owners. The standards can be the basis and reference for the nuclear regulatory authorities and the NPP owners to have unified standards to carry out nuclear safety work, greatly improving work efficiency and reducing unnecessary contradictions in nuclear safety review work. Based on the research results of the ECCS strainer and its nuclear safety performance evaluation and the nuclear engineering practice research conducted by the author, this paper proposes to establish a set of standards on ECCS strainer which covering debris source work down, upstream analysis, debris pressure drop test, chemical effect test, downstream effect (in-vessel) test and downstream effect (ex-vessel) analysis, and finally give out preliminary research results. Keywords: design and performance evaluation of Emergency Core Cooling System Strainer,; debris source; upstream analysis; debris head loss test. (author)