ML19209A531

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Forwards LER 79-043/01T-0
ML19209A531
Person / Time
Site: Peach Bottom Constellation icon.png
Issue date: 09/20/1979
From: Cooney M
PECO ENERGY CO., (FORMERLY PHILADELPHIA ELECTRIC
To: Grier B
NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I)
Shared Package
ML19209A532 List:
References
NUDOCS 7910040288
Download: ML19209A531 (2)


Text

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PHILADELPHIA ELECTRIC COMPANY 2301 MARKET STREET P.O. BOX 8699 PHILADELPHI A, PA.19101 12 t si 841-4000 September 20, 1979 Mr. Boyce H. Grier, Director Office of Inspection and Enforcement Region I United States Nuclear Regulatory Commission 631 Park Avenue King of Prussia, PA 19406

Dear Mr. Grier:

SUBJECT:

Licensee Event Reoort Narrative Descriotion The following occurrence was reported to Mr. Greenman, Region I, Office of Inspection and Enforcement on September 6, 1979

Reference:

Docket No. 50-277 Report No. LER 2-79-43/1T-0 Report Jace: September 20, 1979 Occurrence Date: September 6, 1979 Facility: Peach 3ottom Atomic Power Station R.D. 1, Del a, PA 17314 Technical Soecification

Reference:

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..."

Descriotion of the Event?

uring the inspection program being done in response to IE Bulletin 79-02, two of four bolts on hanger number 32-GE-S41 Y failed due to contact between the bolt anchor shells and the eg support plate. The hanger is associated with the high pressure $

service water system in the Unit 2 A RHR room.

7010 040 2Lf75?

~ .

Mr. Boyce H. Grier Page 2 September 20, 1979 LER 2-79-43/1T-0 Consouences of Event:

Even though the possible failure of this high pressure service water line during a seismic event could affect two HPSW containment cooling subsystems, the safety significance is considered minimal because both the low pressure coolant injection system and the redundant RHR shutdown ecoling subsystems are available.

Cause of Event:

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

Corrective Action:

The defective bolt shells have been removed and replaced by vedge type anchor bolts and have been successfully torque tested.

The resulting anchor bolt safety factor attained is greater than S.

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.

Previous Similar Occurrences:

2-79-32/1T, 2-79-33/1T, 2-79-3S/1T, 3-79-19/1T, 3-79-23/1T, 3-79-24/1T, 3-79-25/1T, 3-79-26/IT Very 'ruly yours,

/

.. J. Coone S erinten ent Generation Division -

Nuclear Attachment ec: Director, NRC - Office of Inspection and Enforcement Mr. Norman M. Haller, NRC - Office of Management &

Program Analysis 1090 241