05000321/LER-1981-068, Forwards LER 81-068/03L-0.Detailed Event Analysis Encl

Forwards LER 81-068/03L-0.Detailed Event Analysis Encl

ML20010A261
Person / Time
Site:	Hatch
Issue date:	08/04/1981
From:	Manry M GEORGIA POWER CO.
To:	James O'Reilly NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II)
Shared Package
ML18023A002	List: 05000321/LER-1981-068, Forwards LER 81-068/03L-0.Detailed Event Analysis Encl 05000321/LER-1981-068-03, /03L-0:on 810706,following Reactor Scram,Hpci Sys Auto Initiated,Tripped on High Reactor Water Level,Then Failed to Restart,Due to Failure of Turbine Stop Valve to Open.Caused by Overspeed Trip Sys Malfunction
References
PM-81-682, NUDOCS 8108110243
Download: ML20010A261 (2)

LER-1981-068, Forwards LER 81-068/03L-0.Detailed Event Analysis Encl

Event date:
Report date:
3211981068R00 - NRC Website

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• August 4, 1981 PM-81-682 PLANT E.1. IIATCli Licensee Event Report Docket No. $0-321 United States Nuclear Regulatory Commission Office of Inspection and Enforcement Region II Suite 3100 101 Marietta Street Atlanta, Georgia 30303 ATTENTION:

Mr. James P. O'Reilly Pursuant to section 6.9.1.9.b of llatch Unit 1 Technical Specifications, please find attached Reportable Occurrence Report # $0-321/1981-068.

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H. ManrP Plant Manager MM/CLC/pebe REGIONAL D' RECTOR xc: J.11. Miller, Jr.

R. J. Kelly DEPUTY DIRECTO3 W. A. Widner ASS;STANT TO D. RECTOR J. T. Beckha" DIRECTOR, RRPI k

DIRECTOR, EPOS DIRECTOR, ENF/lNV Control Room 1)ocument Control DIRECTOR, ET!

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LER 8:

50.-321/1981-D68...._.

Licensee:

Georgia Power Company

.-.--Facility Name: -Edwin I. -Hatch Docketji: ~50-321" "

- Narrative Report for LER 50-321/1981-068

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On 7-6-81, following a reactor scram from 2432 MW thermal the llPCI system auto started on low reactor water IcVel then

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.... 4 r ipped.. onc.high-rcur/ tor.:wa t er-1evel. ' The " opera t~o r'at t entifed' ~

...to manually restart-. IIPCI after water level.had. returned. to -- -

below normal, but ilPCI would not start because the turbine

.stop-valve f ailed to open.

Specs 6.9.1.9.b.

RCIC, ' ADS,. This_ event is reportabic. per Tech

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core spray, and LPCI were opera-ble,.

There were-no ef f ec-ts upon public health and safety due to. this. event.

There was. no impact on Unit 2.

This is -a- -

repetitive occurrence (ref. LER 50-321/1981-051).

The 11PCI stop.. valve. failed to open due ter nalfunction of the turbine overspeed tri.p systen.

Excessive clearance _ b.ctween.

the trip piston and the cylinder bore of the hydraulic trip assembly was _ca,u. sing the, t rip, pi s t.on to Ro to the. trip. po.si-

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' tion under~ t o ' t r i~.-- Oil leakage.through the valve. s. cat..of. the normal oil system pressures, thereby causing the

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' Robertshaw-~ diaphragm control valve. no. del #VC-21D wasL. prevent -

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ing the trip piston from resetting.

Both the Robertshow control valve and the hydraulic trip assembly were replaced.

.Th i s, _.cnab l ed,the. trip._ system. to. function _norwally... The.....

turbine overspeed trip was then cdjusted, and the turbine aas overspeed..testrd.- The 7turbir, perability test' was" performed, o

and itPCI was decl'ared operable.

The unit is now in full complianc.e with the requirements,- and no fur.ther.. reporting is required.

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