05000277/LER-1981-032, Forwards LER 81-032/01T-0.Detailed Event Analysis Submitted

Forwards LER 81-032/01T-0.Detailed Event Analysis Submitted

ML20004D899
Person / Time
Site:	Peach Bottom
Issue date:	06/04/1981
From:	Cooney M PECO ENERGY CO., (FORMERLY PHILADELPHIA ELECTRIC
To:	Grier B NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I)
Shared Package
ML20004D900	List: 05000277/LER-1981-032, Forwards LER 81-032/01T-0.Detailed Event Analysis Submitted 05000277/LER-1981-032-01, /01T-0:on 810520,four Walls Identified Which Were Unstable Under Effects of Tornado Depressurization & Cardox Injection Per IE Bulletin 80-11.Caused by Design Error. Computer Room Doors Partially Blocked Open as Temporary Mo
References
NUDOCS 8106100282
Download: ML20004D899 (2)

LER-1981-032, Forwards LER 81-032/01T-0.Detailed Event Analysis Submitted

Event date:
Report date:
2771981032R00 - NRC Website

text

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PHILADELPHIA ELECTRIC COMPANY g

I 2301 MARKET STREET d..,,*.

P.O. BOX 8699

'l,,'il'NU PHILADELPHI A. PA.19101 i

12851 M4 t-4000 S\\

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June 4, 1981 g

JUN m

00198k ?'

Mr. Boyce 3-Grier, Director g

h Office of Inspection and Enforcement M

fs A

negion I US Nuclear Regulatory Commission D

4 631 Park Avenue King of Prussia, PA 19406

Dear Mr. Grier:

SUBJECT: Licensee Event Report Narrative Description The following occurrence was reported to Mr. C. Cowgill, Region I, Office of Inspection and Enforcement on May 20, 1981.

Reference:

Docket Nos. 50-277 50-278 Report No.:

LER 2-81-32/1T-0 Report Date:

June 4, 1981 Occurrence Date:

May 20, 1981 Pacility:

Peach Bottom Atomic Power Station RD #1, Delta, PA 17314 Technical specification Reference:

Technical Specification G.9.2.1.(9) requires prompt reporting of " Performance of structures, systems, or components that requires remedial action or corrective measures to prevent operation in a manner less conservative than assumed in the accident analyses in the safety analysis report or technical specifications bases; or discovery during plant life of conditions not specifically considered in the safety analysis report or technical speelfications that require remedial action or corrective measures to provent the existence or development of an unsafe condition."

h 0

I 510a y og p.*

• 9 Mr. Boyce H. Grier Prga 2 I

Descciation of the Event:

During re-evaluation of concrete block walls in ecsponse to IC Dulletin 80-11, four walls (68.1 to 68.4) were identified which were unstable under the effects of tornado depressurization and cardox injection.

These are the computer room' walls in the cable spreading room.

Probable Consequences of the Occurrence:

Collapse of the walls could affect safety-related cables which pass through or are in close proximity to the walls.

Cause of the Event

Cause of event is design error.

Corrective Actions

On May 22, 1981, the computer room doors wero blocked open by installing angle stops.

This opening will prevent wall failure due to tornado d pressurization or cardox injection.

9 Permanent design modification is to install vents in the walls at each end of the computer room.

Our prompt notification on May 20, 1981, indicated that ducts would be required to raise the effective vent level, however, further review has determined that the computer room vents can be located such that air conditioning and cardox levels will be maintained without the ducts.

Permanent modifications will ba completed as soon as possible.

Very truly yours, Y

sGl'%f4 M.

Uconey S

rintendent Generation Division - Nuclear cc:

Direc 3r, NRC - Office of Inspection and Enforcement Mr. Norman M.

Haller, NRC - Office of Management &

Program Analysis G

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