05000321/LER-1981-069-03, /03L-0:on 810706,torus Water Level Was Below Tech Spec Limit Following Scram.Caused by Level Being Lowered & Level Gauges Oscillating Due to Perturbations Caused by RHR Sys Running in Cooling Mode.Water Added to Torus

/03L-0:on 810706,torus Water Level Was Below Tech Spec Limit Following Scram.Caused by Level Being Lowered & Level Gauges Oscillating Due to Perturbations Caused by RHR Sys Running in Cooling Mode.Water Added to Torus

ML20009G295
Person / Time
Site:	Hatch
Issue date:	07/23/1981
From:	GEORGIA POWER CO.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II)
Shared Package
ML20009G291	List: 05000321/LER-1981-069, Forwards LER 81-069/03L-0 05000321/LER-1981-069-03, /03L-0:on 810706,torus Water Level Was Below Tech Spec Limit Following Scram.Caused by Level Being Lowered & Level Gauges Oscillating Due to Perturbations Caused by RHR Sys Running in Cooling Mode.Water Added to Torus
References
LER-81-069-03L-01, LER-81-69-3L-1, NUDOCS 8108040101
Download: ML20009G295 (2)

LER-1981-069, /03L-0:on 810706,torus Water Level Was Below Tech Spec Limit Following Scram.Caused by Level Being Lowered & Level Gauges Oscillating Due to Perturbations Caused by RHR Sys Running in Cooling Mode.Water Added to Torus

Event date:
Report date:
3211981069R03 - NRC Website

text

U. S. NUCLEAR REGULATORY COMMISSION iRC FORM 366 7-77)

LICENSEE EVENT REPORT CONTROL BLOCK: l l

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(PLEASE PRINT OR TYPE ALL REQUIRED INFORMATION)

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bJ 61 DOCKET NUMBER 68 69 EVENT DATE 74 75 REPORT DATE 80 EVENT DE',CRIPTION AND PROB A8LE CONSEQUENCES iO lWhile the Plant was in Hot Shutdown, following a scram, the torus water level was I

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focnd to be 145.7 inches.

Tech. Specs. Section 3.7.A.1.a requires minimum water level l g,3, to be greater than 146 inches. The Health and Safety of the public was not affected. l o i,,, i lg,,,

This event was non-repetitive.

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9 10 11 12 13 18 19 20 SEQUENTI AL OCCURRENCE REPORT REv'SION LER RO EVENTYEAR REPORT NO.

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33 34 35 31 40 di 42 43 44 47 CAUSE DESCRIPTION AND CORRECTIVE ACTloNS h li10ll Torus water level was beina lowered and level cauces were oscillatine due to I

li li l l perturbations caused bv RHR System runnina in the containment cooline modo.

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iii,, ipumps were stopped, level was found to be unacceptable.

Water was innlediately added l

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.i 9 9 11 12 LOSS OF OR DAMAGE TO FACILITY TYPE

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,j" PDR ADOCK 05000321 68 69 go g

LER #: 50-321/1981-069 Licensee:

Georgia Power Company Facility Name:

Edwi., I. Hatch Docket #:

50-321

Narrative

Report for LER 50-321/1981-069 While Unit I was recovering from a scram, the water level in the suppression pool was approaching the upper limit for normal operation.

Because of operation of safety relief valves, the water was hot and the RHR system was operating in the suppression cooling mode.

Due to the perturbation caused from this, both level indicators were oscillating and level was hard to determine. When the level stabilized, it was three tenths of an inch below acceptable limits.

Water level was innediately restored to normal limits by normal makeup procedure.

This is not a repetitive occurrence and there was no effect on public health or safety due to this event.

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