05000245/LER-1979-036-03, /03L-0:on 791219,during Shutdown Following Reactor Scram,Water hammer-type Movement Detected in Isolation Condenser Piping.Caused by Introduction of Water Into Isolation Condenser Steam Supply Line.Instructions Revised

/03L-0:on 791219,during Shutdown Following Reactor Scram,Water hammer-type Movement Detected in Isolation Condenser Piping.Caused by Introduction of Water Into Isolation Condenser Steam Supply Line.Instructions Revised

ML20148C002
Person / Time
Site:	Millstone
Issue date:	01/18/1980
From:	Young R NORTHEAST UTILITIES
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I)
Shared Package
ML20148C000	List: 05000245/LER-1979-036, Forwards LER 79-036/03L-0 05000245/LER-1979-036-03, /03L-0:on 791219,during Shutdown Following Reactor Scram,Water hammer-type Movement Detected in Isolation Condenser Piping.Caused by Introduction of Water Into Isolation Condenser Steam Supply Line.Instructions Revised
References
LER-79-036-03L-01, LER-79-36-3L-1, NUDOCS 8001240442
Download: ML20148C002 (1)

LER-1979-036, /03L-0:on 791219,during Shutdown Following Reactor Scram,Water hammer-type Movement Detected in Isolation Condenser Piping.Caused by Introduction of Water Into Isolation Condenser Steam Supply Line.Instructions Revised

Event date:
Report date:
2451979036R03 - NRC Website

text

1.lCENSEE EVENT REPORT

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8 60 El DGCKET NUMiiER 68 03 EVENT D ATE 74 75 flEPOH T DATE SO EVENT DESCHIPTION AND PnOBADLE CONSEQUENCES h lo l2l l On December 19,1979, at 1635 hours0.0189 days <br />0.454 hours <br />0.0027 weeks <br />6.221175e-4 months <br />, during a shutdown followinq a reactor scram.

l Io j a 11 water hammer type movement was detected in the isolation condenser pipi'ng. 'The

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water hammer terminated when the isolation condenser was valved out.

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33 34 35 3G 31 40 41 42 43 44 47 CAUSE DESCniPTION AND COHHECTIVE ACTIONS li l o i 1 Af ter investigation, it was determined that the water harrer was caused from the 1;

li lil I introduction of water into the isolation condenser steam sunniv line.

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