Evaluation of Important Phenomena through the PIRT Process for a Sodium Fire Event

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  • PIRT 手法によるナトリウム火災時の重要現象評価

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Sodium fire is one of key issues in sodium-cooled fast reactor (SFR) plant. JAEA has developed sodium fire analysis codes to evaluate the consequence of sodium fire events. This paper describes a PIRT (Phenomena Identification and Ranking Table) process for sodium fire events. Rnaking table for important phenomena and an assessment matrix are completed. The ranking table has been established through both element- and sequence-based phenomena analyses in addition to the engeneering judgement. The assessment matrix comfirms sufficiency of experimental data for validation of models corresponding to the identified important phenomena in the sodium fire analysis codes. As a part of comprehensive validation, an experimnetal analysis for a large scale sodium spray fire experiment Run-E1 is conducted by using a zone model sodium fire analysis code SPHINCS. The analytical result shows good agreement with the experimental result of gas pressure.

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