ML20210G504

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Responds to NRC 990301 RAI Re GL 96-06, Assurance of Equipment Operability & Containment Integrity During Design- Basis Accident Conditions. Licensee Will Submit Info Re Proposed Sys Mod by 990916
ML20210G504
Person / Time
Site: Vermont Yankee File:NorthStar Vermont Yankee icon.png
Issue date: 07/27/1999
From: Leach D
VERMONT YANKEE NUCLEAR POWER CORP.
To:
NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM)
References
BVY-99-97, GL-96-06, NUDOCS 9908030112
Download: ML20210G504 (2)


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NUCLEAR POWER CORPORATION 185 Old Ferry Road, Brattleboro, VT 05301 7002 (802) 257-5271 July 27,1999 BVY 99-97 U.S. Nuclear Regulatory Commission ATTN: Document Control Desk Washington,DC 20555

References:

(a)

Letter, VYNPC to USNRC," Response to NRC RAI Related to GL 96-06 Response," BVY 98-153, dated October 30,1998 (b)-

Letter, USNRC to VYNPC, " Request For Additional Information Regarding Generic Letter 96-06 Program At Vermont Yankee Nuclear Power Station (TAC No. M96880)," NVY 99-25, dated March 1,1999 j

Subject:

Vermont Yankee Nuclear Power Station License No. DPR-28 (Docket No. 50-271)

I Response To Reauest For Additional information Concernine GL 96-06 l

Generic Letter 96-06, " Assurance of Equipment Operability and Containment Integrity During Design Basis Accident Conditions," dated September 30,1996, requested licensees to evaluate their cooling water systems that serve containment air coolers to assure that they are not vulnerable to water hammer induced failures. Vermont Yankee (VY) had previously stated that we would pursue modifications to our Reactor Building Closed Cooling Water (RBCCW) system to address the potential for water hammer, rather than pursuing an analytical solution. Reference (b) requested further details of our proposed modifications by July 31,1999. Our plan to modify the RBCCW system was based upon our view of the uncertainty in the analytical solutions we were aware of at the time. We have recently become aware of advancements in the analytical techniques in this area and are investigating if this approach can be used to evaluate VY's j

configuration.

As a result, we propose to respond to your Reference (b) request for additional information concerning our proposed system modifications by September 16, 1999. This will allow us to confirm that an analytical solution is applicable to the VY configuration, thus precluding the need for a physical system modification.

If you have any questions concerning this submittal, please contact Jeffrey T. Meyer at (802) 258-4105.

Sincerely, 030052

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cc USNRC Region 1 Administrator T

  1. cf USNRC Project Manager-VYNPS USNRC Resident inspector-VYNPS I

Vermont Department of Public Service 9900030112 990727 PDR ADOCK 05000271 P

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SUMMARY

OF VERMONT YANKEE COMMITMENTS BVY NO.: 99-97 l

The following table identifies commitments made in this document by Vermont Yankee. Any other actions discussed in the submittal represent intended or planised actions by Vermont Yankee. They are described to the NRC for the NRC's information and are not regulatory commitments. Please notify the Licensing Manager of any questions regarding this document or any associated commitments.

l COMMITMENT COMMITTED DATE l

OR " OUTAGE" Respond to Generic Letter 96-06 request for additional September 16,1999 information concerning proposed system modifications l

l VYAPF 0058.04 (Sample)

AP 0058 Original Page1 ofI a