ML20212J294
| ML20212J294 | |
| Person / Time | |
|---|---|
| Site: | Vermont Yankee File:NorthStar Vermont Yankee icon.png |
| Issue date: | 01/19/1987 |
| From: | Capstick R VERMONT YANKEE NUCLEAR POWER CORP. |
| To: | Rooney V Office of Nuclear Reactor Regulation |
| References | |
| FVY-87-12, NUDOCS 8701280131 | |
| Download: ML20212J294 (2) | |
Text
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4 a
VERMONT YANKEE
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NUCLEAR POWER CORPORATION RD 5, Box 169, Ferry Road, Brattleboro, VT 05301
,,,,L,, o ENGINEERING OFFICE i
1671 WORCESTER ROAD FRAMINGHAM, MASSACHUSETTS 01701 TELEPHONE 617-872-6100 January 19, 1987 FVY 87-12 United States Nuclear Regulatory Commission Washington, DC 20555 Attention:
Office of Nuclear Reactor Regulation Mr. V. L. Rooney, Senior Project Manager BWR Project Directorate No. 2 Division of BWR Licensing
References:
(a) License No. DPR-28 (Docket No. 50-271)
(b) Letter, VYNPC to USNRC, FVY 86-62, dated July 11, 1986
+
Subject:
Vermont Yankee Program Regarding RHR Pump Impeller Wear Rings Manufactured by Bingham-Willamette
Dear Sir:
The purpose of this letter is to provide you with an updated status of Vermont Yankee's efforts associated with the above subject and notify you of a schedular delay in initiating our planned inspection program.
In accordance with commitments made in Reference (b), Vermont Yankee is proceeding with plans for inspection of the four RHR pumps at the Vermont Yankee plant. These plans include the procurement of four new impellers from the pump vendor, Bingham-Willamette (BW). As a result of NRC staff concerns with the integrity of the wear rings on the present design impellers, Vermont Yankee proceeded with a long-term solution involving the procurement of impellers with a one-piece casting design with integral wear rings. This integral impeller design also employs a material which is not susceptible to Intergranular Stress Corrosion Cracking (IGSCC).
As stated in Reference (b), Vermont Yankee's planned inspection schedule is contingent upon receipt of the replacement impellers from BW.
Accordingly, Vermont Yankee has followed the design and fabrication process very closely at the vendor's production facility. As we recently informed you (January 9, 1987 telecon), several casting and machining problems associated with the fabrication process were identified whi.ch led to Vermont Yankee's rejection of tt.o first two sets of castings. The third set of castings for Vermont Yankee is in process at this time with the fabrication problems believed to be resolved. As a result, the delivery schedule for shipment of the replacement impellers to Vermont Yankee has been revised to mid-February 1987.
8701280131 870119 PDR ADOCK 05000271 g
I G
I United States Nuclear Regulatory Commission January 19, 1987 Attention:
Mr. V. L. Rooney Page 2 The schedular delay associated with the delivery of the impellers to the Verntont Yankee plant results in a corresponding delay to the overall RHR pump inspection schedule. The impact on the overall program is that Vermont Yankee-now expects to begin disassembly and inspection of the first RHR pump the first week of March 1987.
I Should you have any questions or require additional technical details, j
please contact this office.
Very truly yours, VERMONT YANKEE NUCLEAR POWER CORPORATION Y.
I R. W. Capstick Licensing Engineer RWC/bam l