E000-97-011, Discusses Revised Schedule for Completion of MOV Program Review

Discusses Revised Schedule for Completion of MOV Program Review

ML20137G584
Person / Time
Site:	Crane
Issue date:	03/26/1997
From:	Keaten R GENERAL PUBLIC UTILITIES CORP.
To:	NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM)
References
6710-97-2119, E-97-11, E000-97-011, NUDOCS 9704010435
Download: ML20137G584 (2)

Text

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l Robert O Kosten Vice President Engineering l

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GPU Nuclear,Inc.

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One Upper Pond Road NUCLEAR Parsippany, NJ 07054-1095 Tel 201316-7112 Fax 201-316-7431 March 26,1997 E000-97 011 6710-97-2119 U.S. Nuclear Regulatory Commission Attn: Document Control Desk Washington, D.C. 20555

SUBJECT:

TIIREE MILE ISLAND NUCLEAR STATION, UNIT 1 (TMI-1)

OPERATING LICENSE NO. DPR-50 DOCKET NO. 50-289 i

REVISED SCIIEDULE FOR COMPLETION OF MOV PROGRAM REVIEW In previous correspondence GPU Nuclear committed to completing the motor operated valve program review by March 28,1997. As discussed with the NRC on March 17 and 19,1997, substantial progress has been made to date.110 wever, the work will not be comple:M by March 28,'1997. Detailed below is the status of the work performed to date and a summary of the plans for completing the program review.

The status of the work performed for the MOV program review is'. The topical report on stem factor and rate ofloading has been issued. All differential pressure calculations have been completed by the preparer. The weak link calculations for all MOVs have been revised using a more rigorous methodology. The thrust requirements for all applicable gate valves have been calculated using the Electric Power Research Institute (EPRI) Performance Prediction Methodology. A topical report on valve factor selection has been completed by the preparer.

The thrust and setpoint calculations for all gate valves have been revised. All operability issues identified in the thrust and setpoint calculations for gate valves have been resolved. All MOVs have been risk ranked for periodic verification using the BWROG methodology approved by the NRC. Three (3) MOVs have been modified to increase the margins. Modification packages to increase the margins on additional MOVs are being prepared.

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' Unicss stated otherwisc, calculations and reports are still undergoing review and approval and have not been issued for use

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Pr'or to the NRC engineering inspection scheduled for the weeks of May 12 and May 19,1997, i

we plan to complete and issue all of the items discussed in the above paragraph. In addition, the following tasks will still be in progrecs during the inspection: (1) globe and butterfly valve calculations will be completed by the preparer but may still be in the review and approval process.

Ilowever, all operability issues identified by the preliminary calculations will have been resolved.

(2) the preparation and review of modification packages required to improve margins will still be in progress, In addition to the above tasks, some activities will not be completed until the end of the 12R outage. Those activities include revising the MOV program description and completion of modifications required to improve margins.

Please contact John Schork, TM1 Regulatory Affairs at (717) 948-8832 if you have any questions regarding this matter.

Sincerely, R.W. Keaten Vice President i

Engineering i

/JSS cc:

M. G. Evans - TMI Senior Resident Inspector it J. Miller - Administrator, Region I B. C. Buckley - TMI-l Project Manager 1