ML20084A390

AO 3-2-12:on 730913,during Maint of Closure Mechanism of 80-ft Elevation Outer Door of Vapor Container,Inner Door Partially Opened for Short Period.Cause Unknown.Procedures Revised & Supplemented to Prevent Recurrence

ML20084A390
Person / Time
Site:	Indian Point
Issue date:	09/27/1973
From:	Cobean W CONSOLIDATED EDISON CO. OF NEW YORK, INC.
To:	Oleary J US ATOMIC ENERGY COMMISSION (AEC)
Shared Package
ML20084A392	List: ML20084A390 ML20084A423
References
AO-3-2-12, NUDOCS 8304050176
Download: ML20084A390 (2)

Text

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9 9 Consolidated Edmon Company of New York,Inc.

_. 4 Irving Place, New York, N Y 10003 September 27, 1973 Indian Point Unit No. 2 Docket No. 50-247 A.O. 3-2-12 Of N

G G gf t Mr. John F. O' Leary, Director Directorate of Licensing s i

[f T Office of Regulation 0- OCTJ U. S. Atomic Energy Commission 1 4, IO 7 h '3 Washington, D. C. 20545 $4;r 9

s unpW: i N

Dear Mr. O' Leary:

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on September 13, 1973 during maintenance of the closure mech-anism of the 80' elevation outer door of the vapor container, and while the reactor was in a shutdown condition, the inner door was partially opened for a short period. An investiga-tion was undertaken to determine the cause of the occurrence.

This investigation included discussions with personnel in-volved as well as a review of station procedures relating to the maintenance of those doors and other safety interlocks at Indian Point Unit No. 2.

As a result of this investigation, we have revised and supple-mented our procedures so as to prevent not only a recurrence of this particular condition but also to prevent similar con-ditions in the facility.

Our corrective action includes several tiers of precautions.

The first tier is designed to minimize the need for mainten-ance of the doors of the vapor container. This will be ac-complished by having a member of the operating force open and close the doors when passage by non-operating personnel is required, and the facility is not in a cold shutdown con-dition as defined by the Technical Specifications. At such times, the door operator will also maintain surveillance of the interlock mechanism to assure its continued operability.

The second tier includes specific precautions to prevent re-currence of this condition. Signs have been posted in the entrance chamber in those places where the interlock can be i overriden requiring that the mechanical interlock not be de sd,, 1 0304050 PDR ADO 6Q0 47 PDR COPY SENT ICION /

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, s U O Mr. John F. O' Leary -

2-feated without prior approval by the Watch Foreman. The pro-cedures further require that prior to commencement of main-tenance on these doors, or the interlock mechanism, signs must be posted notifying persons not to attempt to use these doors. In addition to such signs, the procedures require that prior to the commencement of maintenance, an individual must be stationed to prevent the improper use of these doors during the period required for maintenance.

The third tier is designed to prevent similar conditions in the facility. 7.pproved procedures set forth instructions for the controlled defeat of any electrical or mechanical interlocks in the facility for maintenance purposes.

As previously indicated, at the time of the reported condi-tion, the reactor was in a shutdown conditiontherefore, (190oF with con-a shutdown margin > 41 Ak/k). There are ,

sidered to be no safety implications to the occurrence.

Our Ctation Muclear Safety Committee and the Nuclear Facili-ties Safety Coanittee have reviewed this occurrence andeap-prove the corrective actions taken.

Very truly yours, 00ce m c,CSe:m a ~.

Warren R. Cobean, Jr.

Manager - Nuclear Power Generation Department cc/ Mr. James P. O'Reilly 1

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