ML19209B432

RO 2-79-43/1P:on 790906,in Response to IE Bulletin 79-07, Failure in One Support Associated W/High Pressure Svc Water Sys Piping in RHR Room 2A Identified.Larger Anchor Bolts Will Replace 7/8 Inch Bolts W/Installation of Plate Washers

ML19209B432
Person / Time
Site:	Peach Bottom
Issue date:	09/07/1979
From:	Ullrich W PECO ENERGY CO., (FORMERLY PHILADELPHIA ELECTRIC
To:
References
NUDOCS 7910090708
Download: ML19209B432 (2)

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-s PHILADELFNIA ELECTRIC COMPANY Fesch Bottom Atomic Fewer Station Delta. Femasylvania

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j 5eptember 7 197-Nr. Soyce N.

Crier i

Office of Taspection and Enforcement l

Region 1 l

Omited States Naciese Regulatory Commission 631 Park Avenue

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King of Prussim, FA 19406 50RJECT:

RE70RTABLE OCCURRENCE - FROMPT NOTIFICATIGN Confirming J.

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Davenport's conversation with Mr. Greenman.

Region E. United States-Nuclear Regulatory Cennission en September 7, 1979.

Reference:

Dechet No. 50-277 4

Fesch setten Unit 2 j

Teckmical Specification

Reference:

6.9.2.n(9) l Report me. 2-79-43/IP occurrence Date:

September 6 1979 2

Identification of Occurrence:

}i The centimwing seismic macher inspection program being performed j

in response to 1.E.

au11etin 79-02 kas identified a failure in 3

ene support associat6d with the high pressure service water system plylag in the 2A AMR room.

Ayyarent Cause:

5 Emproper instastation of ancher botts.

Analysis of Occurrence:

i pering the inspection of hanger number 32-GR-541 two belts failed due to shell projecties from the estl of greater than I/R inch.

4 Failure of this support anchor.may not have remmited in fafIure of the. supported piping system during a seismic event since alt four bolts in the sucher still meet the torque requirements.

Nomever, even if this pip 5mg system wantd have failed, only two containment.cet ting subsystems wonto be affected and both LFCI subsystems would still remain operable.

%h M Co rre ct ive A c.t i o n :-

Fresently, the original 7/8" she11 type anchors are being re-ydaced mith 1 1/4"~hilti kwin bolts.

Also.

4" s 4" piste mashers are being installed en the plate to assure the proper lJl7 gpg 7 910 0 00 7CP f

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piste edge to anchor bolt hole distance.

Previous Failures 2-79-33/1F

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2-79-35/1F-3-79-19/1F J

3-79-23/1F 3-79-25/1F 3-79-26/1F Yery truly yours.

W. 7. W11 rich. Supwrintendent Fesch 9etten Atomic Fower Station WFJ/JED:1ja t*

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