ML19309F135

RO 50-366/1980-045:on 800405,during Cold Shutdown,Leak Rate Test on Automatic Depressurization Sys Valve Air Supply Accumulator Check Valves Indicated Unacceptable Leakage Rates.Cause Under Investigation.No Immediate Action Taken

ML19309F135
Person / Time
Site:	Hatch
Issue date:	04/07/1980
From:	Manry M GEORGIA POWER CO.
To:
References
NUDOCS 8004280531
Download: ML19309F135 (2)

Text

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'I 01 BAXLEY, GEORGIA 31513 PMS MR. JAMES P. O'REILLY

'/ l2 ' l ,- l g UNITED STATES NUCLEAR REGULATORY COMMISMION DIRECTOR OF INSPECTION AND ENFORCEMENT REGION II SUITE 3100 101 MARIETTA STREET ATL A'IT A , GEORGIA 30303

SUBJECT:

Hatch Unit 2, Docket No. 50 S46, Notification of Repo" table Occurrence No. 50-366/1080-045.

NOTIFIED: Arthur Ox cuath DATE: 4 7-80 DATE: h-9 90 TIME: 19: 45 CST DESCRIPTION OF REPORTABLE OCCURRENCE Initial Condition With Unit 2 in c o 1. d shutdown, a leak

• ate test was pe"formad on the ADS valves' air supply accumulator check valves.

Results of this test were relayed to the A/E for analysis.

Nature of Occue"ence The A/E determined that the leakage rates that ware found were unacceptable and that a loss of air supply to the ADS valves could "esult in inope-ability of ADS within one half houa.

The p"ocedure that dealt with the opeaator's response to an air supply low pressure alaam did not address this condition.

Immediata Co-rective Action Since taken.

Unit 2 is in cold shutdown no immediate action has been Cause j

The cause of this event is unknown at this time.

investigation.

It is under Supplemental Corrective Action Supp'emental action will be taken as required by the r e s u '. t s of the investigation or cause.

Status of Redundant on Backuo Systems No backup systems exist for these accumulator / check valve subsystems.

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UFFICLE COPY S " " * *

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Imoact to Other Unit Leakage aates of the Unit 1 accumulator check valves are not known; howevea, a leak rate test is scheduled for the next cold shutdown of sufficient duaation. In addition, the Unit 1 p"ocedure has been aevised to call for a declaration of AD9 inoperability upon an drywell pneumatic air supol.v low pressure alarm.

Justi*1 cation for continued Ooeration Unit 2 is present1v in cold shutdown.

M. Manav Plant '4anagea t

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