ML20126L144

RO 2-81-32/1P:on 810520,w/units in Shutdown Condition, re-evaluation of Concrete Block Walls Identified Four Walls Unstable Under Effects of Tornado Depressurization & Cardox Injection.Caused by Const or Design Error

ML20126L144
Person / Time
Site:	Peach Bottom
Issue date:	05/20/1981
From:	Ullrich W PECO ENERGY CO., (FORMERLY PHILADELPHIA ELECTRIC
To:	Grier B NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I)
References
RO-2-81-32-1P, RO-81-002, RO-81-2, NUDOCS 8106010307
Download: ML20126L144 (3)

Text

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           .# -                                                                       PHILADELPHIA ELECTRIC" COMPANY
                                       .'                                  Peach Bottom Atomic Power Station.

Delta, Pennsylvania 17314 .

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Offitte 'of Inspection, and Enforcement; , W;; . Dngion % United States Huclear Reguiatory Commi? sion . i't-4 O"

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SUBJECT:

REPORTABLE. OCCURRENCE - PROMPT NOTIFICATION , I '. Confirming R. S. Fleischmann's conversation with Mr. .C. s .

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Reference:

Docket No. " 50-277 a 50-a78

                                                                                                  ~ Peach 30ttom Units 2 and 3 Technical Specification Refeience: 6.9.2in.(3) 2a61-32/IP
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                                  .O.ccurrence.. Date: 5/20/31               -                             -

Idsntificati'on - of Occurrence: s R$ evaluation of concrete block walls identified four walls which were unstable urider the effects of tornado depressurization and ' cardox injection. , Canditions Prior g Ocentrence: ' Unit $ s. hut down.. for an. unrelated forced outage.. Unit'3 shut down for a refueling outage. . App.ah nt cause of occurrenee ~ m !r O, , construction- or design error. ,'< I' * ' . N .'

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M4', Boyce H. Orior Page 2

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Analysis of, Occurrence:- During the re-evaluation. of concrete block walls in response to IE Bulletin 60 11, four walls, identified as walls 6d.1 to 68.4,

!         were found to be unstable under the effects of tornado l          d gressurisation and cardox injection. These are the computer                                                                                                                      l room walls in the cable spreading room. Collapse of the walls could affect safety-related cables which pass through or are in cloce proximity to the walls.

05Frective Actiont- '. Until a permanent ~ modification. i's completed, the computer room doors will be- blocked open..approximately 3 inches. ':'his opening will prevent wall failure ,due ' to either tornado depressur12ation-or cardox injeotion. The permanent' design modification requires insta11'ation. of vente cbove the computer room doors with ducts added to raise the vent - opening to the t'op of 1Fhe computer room. This elevat'ed vent',- cponing is required to maintain,. air conditioning and cardox levols in the computer room. Previous-Cecurrences Xene. ,, t Very truly yours,. 1d, T. Ullrich Station Superintendent. . . Peach Bottom Atomic Power Station \. l 1 i t . l l .

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