BVY-97-146, Documents Revised Submittal Date of 980630 for Vermont Yankee Ipeee.Addl Time Will Allow Plant to Complete close- Out & Documentation Activities While at Same Time Avoid Impact to Mar 1998 Refueling Outage

Documents Revised Submittal Date of 980630 for Vermont Yankee Ipeee.Addl Time Will Allow Plant to Complete close- Out & Documentation Activities While at Same Time Avoid Impact to Mar 1998 Refueling Outage

ML20198P559
Person / Time
Site:	Vermont Yankee File:NorthStar Vermont Yankee icon.png
Issue date:	11/04/1997
From:	Reid D VERMONT YANKEE NUCLEAR POWER CORP.
To:	NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM)
References
BVY-97-146, GL-88-20, NUDOCS 9711070203
Download: ML20198P559 (2)

Text

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'VE*RMONT YANKEE g

NUCLEAR POWER CORPORATION

- 185 Old Ferry Road, Brattleboro,VT 05301 7002 (802) 257-5271 November 4,1997 BW 97-146 United States Regulatory Commission ATTN: Document Control Desk Washington, DC 20555

References:

(a) Ucense No. DPR-28 (Docket No. 50-271)

(b) Letter, WNPC to USNRC, BW 94-38, April 13,1994 (c) Letter, WNPC to USNRC, BW 95 88, August 21,1995 (d) Letter, WNPC to USNRC, BW 96160, December 18,1996 (e) Generic Letter 88-20, Supplement 4, " Individual Plant Examination of External c

Events (IPEEE) for Severe Accident Vulnerabilities

Subject:

Revised IPEEE Schedule for Vermont Yankee This letter documents a revised submittat date of June 30,1998 for the Vermont Yankee IPEEE. The additional time la necessary due to the support provided by our IPEEE analysts to our Maintenance Rule implementation activities and our Design Basis Document development program. In addition, modeling of fire hazards has been more difficult than anticipated based on use of the FIVE methodology. More detailed modeling o' heat release rates and fire propagation are being performed to adequately model the plant response to fire initiators. Also, while performing IPEEE flood analysis, a number of design basis internal flood issues were identified. Evaluation and correction of these design basis issues has delayed the beyond-design basis flood analysis required by the IPEEE.

Significant progress toward completing our IPEEE has been made thus far, in addition to completion of the Internal flooding issues discussed above, work already completed includes evaluations addressing aircraft crashes, onsite and offsite chemical releases, external flooding, and high winds and tornadoes. Work to develop fire initiating event frequencies is also nearing completion. The remainder of the work to be completed includes seismic / fire Interaction walkdowns, fire area screening, and the assessment of seismic vulnerabilities.

In order to gain the maximum organizational benefit, we have maintained a policy of keeping IPEEE expertise internal by using dedicated, in-house resources rather than rely on contractors. Accordingly, we have developed a revised schedule that will ensure IPEEE related vulnerabiliiles are identified by December 31,1997 and that our report will be submitted by June 30,1998. This additional time will

' allow us to complete close-out and documentation activities while at the same time avoiding an impact to our March 1998 refueling outage.

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Should you have further questions with regard to this schedular extension, please contact this offios.

Sincefsly, ,

VERMONT YANKEE NUCLEAR POWER CORPORATON Donald A. Reid Senior Vice President, Operations

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- cc: USNRC Region 1 Administrator -

- USNRC Resident inspector WNPS USNRC Project Manager - WNPS V 4 b-QMIp i NOTARY g l

I STATE OF VERMONT )

WINDHAM COUNTY f -

Then personally appeared before me, Donald A. Reid, who, being duly sworn, di ,M N r Vice Proeident Operations, of Vermont Yankee Nuciaer Power Corporation, that he is duly authorir WomeeUWand file the foregoing document in the name and on the behalf of Vermont Yankee Nuclear Power Corporation, and that the statements i

therein are true to the best of his knowledge and belief.

Ah ov  %

Elly A.8andstrum, Notary Public 7

My Commission expires February 10,1999 i

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