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Provides supplemental info to 711209 rept re failure of relief valves on secondary side of steam generator of PWR. Caused by failure to consider reaction forces of discharging valves in design of nozzles.

Accession Number: ML20090D642

Date Released: Sunday, November 8, 2020

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• ML20090D637 - Provides supplemental info to 711209 rept re failure of relief valves on secondary side of steam generator of PWR. Caused by failure to consider reaction forces of discharging valves in design of nozzles. (1 page(s), 4/21/1972)
• ML20090D644 - Notifies of possible deficiency re Westinghouse PWR NSSS header assemblies.Response requested as to whether headers installed in facility steam lines,within 10 days. (2 page(s), 12/10/1971)