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Part 21 rept re atmospheric dump valves.Cause of failure speculative but result of piston ring that failed to seal. Resolution to problem requires increasing pilot valve capacity & reworking of plug to enlarge pilot flow area.

Accession Number: ML20247P804

Date Released: Thursday, September 17, 2020

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• ML20247P799 - Part 21 rept re atmospheric dump valves.Cause of failure speculative but result of piston ring that failed to seal. Resolution to problem requires increasing pilot valve capacity & reworking of plug to enlarge pilot flow area. (2 page(s), 4/4/1989)
• ML20247P807 - Forwards ltr in which concerns for potential significant deficiency under 10CFR21 expressed. (1 page(s), 4/4/1989)