Representatives of the State Scientific and Technical Center for Nuclear and Radiation Safety have participated in the fourth (final) working meeting within Task A4.3 of project BY3.01/13 (BE/RA/08) “Support to the regulator in reviewing the PSA documentation”, which was to provide support to the regulatory body of the Republic of Belarus (GAN) in expert assessments of deliverables on the probabilistic safety analysis (PSA) of the Belarusian NPP.
Project BY3.01/13 (BE/RA/08) was initiated by international organization INSC. It involves European technical safety and support organizations (ETSON member organizations). They include SSTC NRS (Ukraine), GRS (Germany), IRSN (France), VTT/STUK (Finland), LEI (Lithuania). The project coordinator is RISKAUDIT. The Ukrainian party, jointly with other ETSON member organizations involved in the project, provides support and assistance to GAN experts and its technical support organizations (SSTC NRS, JIPNR Sosny) in comprehensive assessment and NRS review of safety justification documents for the Belarusian NPP.
“The main objective of the meeting was to present European practices and approaches to PSA related to internal and external hazards, as well as to present and discuss the results of reviewing the safety analysis report for the Belarusian NPP by European experts in these areas”, head of the laboratory of the Nuclear Installation Seismic Resistance and Equipment Qualification Department Oleksandr Sakhno says.
Within Task A4.3 of BY3.01/13 (BE/RA/08), experts of the SSTC NRS Nuclear Installation Seismic Resistance and Equipment Qualification Department performed expert assessment of PSA documents for the Belarusian NPP regarding seismic impact analysis (Seismic PSA), the used approaches were reviewed and, as a result, conclusions were made.
In turn, head of the NPP Probabilistic Safety Analysis Laboratory of the SSTC NRS NPP Thermohydraulic and Probabilistic Safety Analysis Department Oleh Ponochovnyi reviewed the methodology used during PSA development for internal flooding and presented the results of flooding PSA assessment.
In general, SSTC NRS experts outlined a number of methodological and technical aspects of PSA documents for the Belarusian NPP on seismic impact and internal flooding, which require close attention of GAN, provided comprehensive, reasoned explanations and answers to comments and questions regarding the presented analysis results.
The meeting participants developed a number of recommendations for GAN aimed at ensuring high technical quality of PSA documents, improving its completeness, justification of input data and results.
Summing up the working meeting within Task A4.3 of BY3.01/13 (BE/RA/08), the participants noted its high professional level and efficiency. The representatives of the Belarusian party expressed gratitude to the European experts for their fruitful work. Recommendations and proposals on further cooperation within the next INSC project were also made.