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Forwards Reactor Sys Branch & Containment Sys Branch assessments of safety significance of simultaneous failure of MSIV & nonreturn valve.Recommends that util verify proper closure of nonreturn valves at each opportunity.

Accession Number: ML20104A605

Date Released: Sunday, October 27, 2024

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• ML20104A601 - Forwards Reactor Sys Branch & Containment Sys Branch assessments of safety significance of simultaneous failure of MSIV & nonreturn valve.Recommends that util verify proper closure of nonreturn valves at each opportunity. (7 page(s), 1/25/1985)
• ML20106J270 - Review re core thermal-hydraulic response to postulated blowdown of two steam generators.Proper operation of check valves can significantly reduce post-reactor trip return to power. (3 page(s), 1/25/1985)
• ML20106J295 - Safety evaluation rept re containment response to postulated blowdown of two steam generators.Containment design pressure would not have been exceeded & containment integrity not jeopardized during main steam line break. (2 page(s), 1/25/1985)