ML19308A536

Abnormal Occurrence 74-32:on 741226,both Doors of Reactor Bldg Personnel Access Hatch Opened Simultaneously.Caused by Fault in Door Closing Mechanism.Relocation of Latching Bar Alarm & Interlock Switch Under Consideration

ML19308A536
Person / Time
Site:	Three Mile Island
Issue date:	12/26/1974
From:	Herbein J METROPOLITAN EDISON CO.
To:
References
NUDOCS 7910260534
Download: ML19308A536 (3)

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FRO:.': Metropolitan Edison Co. DATE O.; COC OATE REC'O LTR T'/.'X ' R PT CT:ER Lebanon, Pa. 17Ch2 -

J. A Herbein 12-2o-Th 12-30-Th X XX TO: CRIG CC OTHERI SENT AEC ?OR 1 SENT LCCAL ?D R -_. #

Mr. J.P. O'Reilly l UNCLASS P ROP !N.:C. INPUT l NO CYS REC'D DOCKET NO: .

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CCC< 1 co Mg DESCR!?TiCN: Ltr advising of Abnor=al occurrendNCLOSURES: mO D D A0-Th-32 on 12-25-7h involving the outer door of-the Reactor Bldg. Personnel Access Hatch being L. dW inadvertently left open..... ppg-- -

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W/ Copies W/ Copics W/ Copies W/4/ Copies PARR (S) VASS ALLO (S) ICIIGHTON (E) SPEIS (S)

W/ Copics W/ Copies W/ Copies W/ Copies /l ICIIEL (S) PURPLE (S) YOUNG 3LCCD (E)

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WCTROPOLITAN EDISON CCMPANY suwor.any or omnu run n:onuurscon;onenox f OPPICE 80% 24) 8.ESANQff, PE PN)Yt.V A*nA 17942 TELEPtK)fvt 717 - 272M6i Decerr.ber 26, 1974 .-

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Mr. J.P. O'Reilly. Director

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Directorate of Regulatory -

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631 Parit Avenue King of Prussia, Pa.

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Operating License DPR250' Doclutt 50-2t!9 D D

Subject:

Abnomal' Occurrence tio. A0 74-32 QO

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Dear Mr. O' Ret Ily:

1 - - a This tehgram is to confim the telecon between Mr. Fasuno (Pegion I-AEC),

and J.G. Herbein ( TMI-Station Superintendent) at 1500 hours0.0174 days <br />0.417 hours <br />0.00248 weeks <br />5.7075e-4 months <br /> 26 Decemtmr 1974. .

Tim follwimi report is submitted in acconlance with paragraph G.7.2.4.2 (page 6-11) of the technical specifications.

On 26 Decm.bar both doors of the Peactor Dullding Personnel Acenss Hatch were opaed sirasitaneously while the plant was at 99.35% pow 2r (2513,2 IWt).

The outer door of the Reactor Building Personnel Access Hatch was inadver-tently left open following personnel egress from the Ranctor Bui~ldirg after a routine intpectica, Tire outer door ws dt scovered ajor een th- Irmer door was opened on subscrivant personnel curess. Outh the inne.r and outer door of the lle*ctor Building Personnul Access Hatr.h wem s frultaneously open for approximately 8 mitwtes. .

Upon discovery that both doors werw open, both doors wre imediately cloud.

Subminent investigatien indicated that trough the outer door was open, ttm latching har associntM wt th the door closing ratchaniwt int.criock and alam was it7 the closed position.

W th the outer door latchin4 tar in. Lt.e closwd posi Licn; the cutor door oper alana was rat. actuated and the- irmer door irrterlock was satisfled, 13160

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' .P. O' Rollly l

.a r '26,~ 1974 1 Relocation of ttm latchirn bar alarn and interlock switch is being considered as a possible solution to the problem.

i In addition, appupriate personrwl will be instructed to visually verify thet Reactor Building doors are closed upon access and egress.

Very truly yours, l i

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.G, Herbein Station Superinteredent JGf/dmn D*9 D Oa O - -

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