ML20207Q342

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Forwards Justification for Multi-Cycle Operation for Vermont Yankee Core Spray Nozzle Weld Overlays, Demonstrating Replacement of Safe Ends During Cycle 12 Unwarranted.Replacement Will Be Based on Future Insps
ML20207Q342
Person / Time
Site: Vermont Yankee Entergy icon.png
Issue date: 01/12/1987
From: Murphy W
VERMONT YANKEE NUCLEAR POWER CORP.
To: Muller D
Office of Nuclear Reactor Regulation
Shared Package
ML20207Q343 List:
References
RTR-NUREG-0313, RTR-NUREG-313 FVY-87-07, FVY-87-7, NUDOCS 8701270189
Download: ML20207Q342 (2)


Text

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? 't VERMONT YANKEE NUCLEAR POWER CORPORATION RD 5, Box 169. Ferry Road, Brattleboro, VT 05301 VY 87-07 3 y ENGINEERING OFFICE 1671 WORCESTER ROAD

  • FRAMINGHAM MASSACHUSETTS 01701 January 12, 1987 United States Nuclear Regulatory Commission Washington, DC 20555 Attention: Office of Nuclear Reactor Regulation Mr. Daniel R. Muller, Director BWR Project Directorate No. 2 Division of Licensing

References:

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

(b) Letter, VYNPC to USNRC, FVY 86-36, dated May 5, 1986 (c) Letter, VYNPC to USNRC, FVY 86-49, dated June 2, 1986 (d) Letter, USNRC to VYNPC, NVY 86-113, dated June 16, 1986

Subject:

Core Spray Safe-Ends Replacement

Dear Sir:

By letter, dated June 16, 1986 [ Reference (d)], NRC approved Vermont Yankee's 1986 outage weld overlay design and repair methodology for the two core spray nozzle-to-safe end welds. Your letter further recommended that Vermont Yankee seriously consider replacing both core spray safe ends during the next refueling outage. The purpose of this letter is to provide you with our current plans with regard to this matter.

Vermont Yankee has considered replacing both core spray safe ends during the 1987 (Cycle 12) refueling outage and determined that the replacement during this outage is not presently warranted. The basis for this determination is provided in the enclosed report (Enclosure 1) which demonstrates that acceptable overlay service can be expected through to the end of the next operating cycle (Cycle 13) and beyond, even when factoring in the conservative assumptions of draft NUREG-0313, Revision 2. Vermont Yankee does, however, recognize the weld overlays as an interim solution and will schedule replacement of the safe ends based upon future inspection results.

As stated in our letter of June 2, 1986 [ Reference (c)], we intend to inspect the weld overlays at the conclusion of this operating cycle in accordance with EPRI/NRC weld overlay inspection criteria. The techniques utilized will be capable of detecting flaws in the weld overlay and lack of bond between the weld overlay and the nozzle of safe end. These ultrasonic examinations will be conducted consistent with the methods and requirements of the EPRI training prograu for weld overlay examination. This program will be 0

8701270189 870112 R ADOCK 05000271 PDR i hf

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r r l United States Nuclear Regulatory Commission January 12, 1987 Attention: Mr. Daniel R. Muller, Director Page 2 reviewed by Vermont Yankee to determine if any adjustments to the program, procedures, or qualifications are required for use with Inconel weld overlay material. With regard to our commitment of June 2,1986, we will provide the detailed plans for inspecting these weld overlays in early May 1987.

We trust that our plans and schedule with respect to this matter are acceptable; however, should you have any questions cr require additional information concerning this matter, please contact us.

Very truly yours, VERMONT YANKEE NUCLEAR POWER CORPORATION f

WarrenP.MurphyG 1 Vice President and Manager of Operati s RWC/jmk Enclosures

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