ML19305A926

Forwards Revised LER 80-001/01X-01

ML19305A926
Person / Time
Site:	Peach Bottom
Issue date:	03/13/1980
From:	Cooney M PECO ENERGY CO., (FORMERLY PHILADELPHIA ELECTRIC
To:	Grier B NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I)
Shared Package
ML19305A927	List: ML19305A926 ML19305A933
References
NUDOCS 8003180586
Download: ML19305A926 (3)

Text

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PHILADELPHIA ELECTRIC COMPANY 2301 MARKET STREET P.O. BOX 8699 PHILADELPHI A. PA.19101 (2:51 e414ooo ila r c h 13, 1930 Hr. Boyce ll . Grier, Director R e ;t io n I Office of Inspection & L.n f o r c e me n t US Huclear Regulatory Commission 631 Park Avenue King of Prussia, PA 19406 ,

Dea r tar . Grier:

SUbJ6CT: R e,v i,s e d Licens,ee, Event Report N a r r a,t i_v e, Descript, ion This report revises the ten day response submitted on January 17, 1980. The event date, orginally stated as January 3, 1980, has been corrected to reso December 31, 1979.

Reference:

Docket Ho. 50-277 Report No.. LER 2-60-1/lX-1 Report Date: lia rc h 13, 1980 occurrence Date: December 31, 1979 Facility: Peacu do t t oia Atomic Power Station RD 1, Delta, Pennsylvania 17314 Te c n n i.c a l Specific _ation

Reference:

Technical Jpecification 6.9.2a(6) requires r e p o r t i n ;;

" personnel error or procedural inadequacy which prevents or could prevent, by itself, t ii e lulfillment of the functional requirements of systems required to cope with accidents analyzed in the SAh "~

Descri,ptiony of the,hvent:

un December 31, 1979, with Unit 2 at 92% power and the drywell beinn deinerted in preparation for a planned outage, two drywell ventilation isolation valves (AO-2521A 6 A0-2521h) were inund to be fully opened instead of being limited to 37 degrees

.open which in pos ;ttted durin:t reactor operation. Tne valves were i.nme d ia t e ly readjusted to less than 37 degrees open. The 8003180fgh j .

s Hr. hoyce 11 . Grier Page 2 valves had ocen in the full open position for approximately eight hours. It was not until January 3, 1980, that the event was identified as reportable at which time LER 2-80-1/IP was submitted.

C_ q n s e q u_e n,c_e_s, o,f E v e_n t Reactor operation with the isolation valves at more than a 37-degree opening could have resulted in a closure time greater than the maximum allowable five seconds for the drywell ventilation isolation valves.

gause qf, Eyegt Tne valves were in the full open* position because the air supply regulator output pressuress to the valves had been incorrectly set. The most probable cause of the event was inadequate procedural control.

Corrective Action:

Discussions have taken place between Philadelphia Electric Company (PECO) and NRC personnel concerning the operation of the drywell ventilation isolation system at PBAPS. Also, a meeting between PECO and the NRC was held in Bethesda, Maryland on August 24, 1979 to review operational aspects of this system.

Recommendations for long term rao d i f ic a t i o n s to the containment ventilation isolation valves are being developed oy che'PECO Engineering Department and the valve manu f acturer . The short term solution, as discussed at the referenced meeting with the NRC, has been to place administrative controls on valve

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operation to ensure the five second c1osure time.

In this case, immediately after the valves were found full open the corrective action was to reduce the opening to less tnan 37 der,rees. In addition, e .autionary tag stating the correct operating pressure has been placed on the air supply regulator for each drywell ventilation isolation valve on Unit 2 and Unit 3.

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'ni. boyce si . G rie r Page 3 A l s o , -- p r o c e d u r a l revisions will be r.ia d o to include a requirement to maintain the output of the air supply r e g u l a t in t; valve at zero psig~(the isolation valves requirp air to open) during reactor operation except wit i l e inerting or deinerting t it e utjwell. It, therefore, will take two deliberate and separate actions to operate the isolation valves (solenoid actuation and

{- regulator-adjustment). The procedural changes are being made to ensure the proper operation oL the drywell ventilation isolation valves.

Very truly yours,

/f.

, p j & A 4 u, -

X. J. Cooney Superintendent Ge'neration Division - Huclear Attachment cc: Director, HRC - Office of Inspection and Enforcement Hr. Norman H. lia l l e r , NRC - Office of tlanagement 5 Program Analysis A

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