ML19225C800

Forwards LER 79-033/01T-0

ML19225C800
Person / Time
Site:	Peach Bottom
Issue date:	07/26/1979
From:	Cooney M PECO ENERGY CO., (FORMERLY PHILADELPHIA ELECTRIC
To:	Grier B NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I)
Shared Package
ML19225C802	List: ML19225C800 ML19225C803
References
NUDOCS 7908020465
Download: ML19225C800 (2)

Text

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PH 8 LAD ELPHI A ELECTRIC COM PANY 2301 M A RK ET STREET P.O. BOX 8699 PHILADELPHI A. PA 19101 121si e .i 4cco July 26, 1979

f r . Soyce H. Grier, Director Office of Inspection and Enforcement R e r,i o n I United States Nuclear kegulatery Commission 631 Park Avenue King of Prussia, Pennsylvanta 19406

Dear '! r . Grier:

SU3 JECT Licen,ee Eveat Report Narrative Descriotion The following occurrence was reported to Mr. Mc. me, Region I, Office of Inspection and Eaforcement on July 13, 1 '79.

Reference:

Docket Numbe 50-277 50-273 3eport No: LER 2-79-3s/IT 2eport Date. July 26, 1979 Occurrence Date: July 12, 1979 Facility: Peach Botton Atomic Power Station R.D. 1, Delta, PA 17314 Technical Soecification ?.eference:

Technical Specification 6.9.a(9) requires reporting

" performance of structures, systems, or components that require remedial action or corrective measures to prevent operation in a manner less conservative than assumed in the accident analysis in the safety analysis report..."

D e.s_c r.i.p t i o n of the Event:

The continuing seismic anchor inspection p r o 7. r a m being performed in response to II Bulletin 79-02 identified two shell tyne an cit or s on a four anchor support which failed to torque properly. These anchors on a single support (hanzer) vere associated with the emergency cooll'z water piping in the area of the e m e r 7 e n c :. coolina teuer valve room. Q,/

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'/37 30F p wasonoM;5

Mr. 3oyce H. Grier Page 2 July 26, 1979 IZR 2-79-33/IT Consequences of Event:

The emergency cooling water pioing supported by this hanger is placed in service only during usual events such as extreme flood or loss of Conowingo Pond. The operability of the emergency service water system and emergency cooling water system is not diminished during normal opera rions.

The likelihood of a seismic event occurrence coincident with the unusual environmental events is considered to be highly unlikely. Therefore, the safety sienificance of these anchor test failures is considered to be minimal.

Cause of Event:

Investigation indicates the most probable cause of the test failure for these two anchor bolts was improper installation.

Corrective Actionr One anch or b olt (shell type) failed to meet the test criteria and was immediately replaced with a wedge type anchor bolt. In accordance with the approved testin; procedure, the other bolts on this anchs - plate were then torque testad. This identified a second anch or bolt torqr.e test failure. Due to interferences in the area of the second resc failure, twe wedge type anchors were installed on tb. same plate approximat .y 3 1/2" lower than the original bolt locations. This modification of the a3chor was performed in accordance with the inspection program. Corrective action nas been c omp le t e d .

The anchor inspection program, as required by IE Bulletin 79-02, is continuing and will serve to ensure that all seismic anchors are satisfactorily installed.

Yours truly,

-r 1 ,

i

/lL{ n G .,

MgJ. Cooney Superintende.:

Ceneration Division-Nuclear Attachment cc: Directer, NRC - Office of Inspection and Enforcement Mr. lcr an '

. ? aller, M'C - Office of Management &

Prcoram .\ n a l y s i s