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Forwards LER 99-004-00 re 990701 discovery of pressure setpoint drift of thirteen MSS SRV due to corrosion induced bonding within SRVs.

Accession Number: ML20210D577

Date Released: Tuesday, August 11, 2020

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• ML20210D571 - Forwards LER 99-004-00 re 990701 discovery of pressure setpoint drift of thirteen MSS SRV due to corrosion induced bonding within SRVs. (1 page(s), 7/23/1999)
• ML20210D582 - LER 99-004-00:on 990701,determined that thirteen MSRVs failed to meet 1% setpoint tolerance due to setpoint drift.Caused by corrosion induced bonding between pilot disc & seat.All fourteen SRVS pilot valves were replaced. (4 page(s), 7/23/1999)