ML20071Q929
| ML20071Q929 | |
| Person / Time | |
|---|---|
| Site: | Vermont Yankee File:NorthStar Vermont Yankee icon.png |
| Issue date: | 08/03/1994 |
| From: | Tremblay L VERMONT YANKEE NUCLEAR POWER CORP. |
| To: | NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM) |
| References | |
| BVY-94-77, NUDOCS 9408120087 | |
| Download: ML20071Q929 (2) | |
Text
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V$RMONT YANKEE NUCLEA,R POWER CORPORATION Ferry Road, Brattleboro, VT 05301-7002
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REPLY 70 ENGINEERING OFFICE j
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580 MAIN STREET l
BOLTON, M A 01740 (508) 779 4 711
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August 3,1994 BVY 94-77 United States Nuclear Regulatory Commission ATIN: Document Control Desk Washington, DC 20555
References:
a.
License No. DPR-28 (Docket No. 50-271) b.
Letter, VYNPC to USNRC, BVY 90-044, dated April 8,1990.
c.
Letter, USNRC to VYNPC, NVY 90-161, dated August 23,1990
Subject:
Amendment No.125 to Facility Operating License regarding DC Power System In Reference (b) Vermont Yankee submitted a proposed change to the plant Technical Specifications with regard to the DC Power System at Vermont Yankee Nuclear Power Station.
This proposed change was approved by the NRC as License Amendment No.125 via Reference (c).
During a recenneview of the surveillance requirements. contained in the. Vermont Yankee Technical Spedrications, we have detected an apparent discrepancy between o'ur submittal of Reference (b) and wording contained in the' NRC Safety Evaluation ~ Rep' ort (SER) enclosed with Reference (c) regarding the use of the tenn " pilot cell" as it' pertains to batteries in the DC power system.
In the " Reason for Change" section of the Vermont Yankee proposed change submittal
[ Reference (b)], Paragraph 3 reads as follows:
"The present surveillance rec uirement to measure the temperature of cells adjacent to the pilot cells has been rep' aced with the requirement to measure the temperature of the allot cell itself..... The temperature of every sixth cell will be measured quarter; y for the purpose of specific gravity correction."
Paragraph 8 of the same sectic.n reads as follows:
"The electrolyte temperature and level and cell voltage are important parameters to be monitored during quarterly battery surveillance and is recommended by both the battery manufacturers and IEEE. IEEE recommends the temperature of every sixth cell be measured and recorded."
The revised Technical Specification pages contained a requirement to measure and log the specific gravity, temperature, level and voltage of the pilot cell weekly and a requirement to measure and log the voltage, temperature, level and specific gravity of each cell every threc months.
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VERMONT YANKEE NUCLEAR POWER CORPORATION United States Nuclear Regulatory Commission August 3,1994 Page 2 In the Safety Evaluation Report which accompanied Reference (c), Paragraph 2 reads as follows:
"The proposed SR 4.10.A.2.a adds a rec.uirement to measure and record pilot cell (every sixth cell) electrolyte level wee dy. It also requires measurement of the temperature of the pilot cell itself weekly. The proposed SR 4.10.A.2.b adds a requirement to measure and record electrolyte level and temperature for all the cells durmg quarterly battery surveillance."
The wording contained in the SER implies that Vermont Yankee treats every sixth cell as a pilot cell. The proposed change letter { Reference (b)] discusses using a measurement from every sixth cell for quarterly temperature averaging, but does not state that every sixth cell is a pilot cell.
Vermont Yankee, following common industry practice, has always designated one cell per battery bank as the pilot cell. Performing surveillance on every sixth cell on a weekly basis would mandate surveillance testing which would extend well beyond common industry practice and would represent a significant, unnecessary burden on Vermont Yankee.
We request that the Staff review References (b) and (c) and revise and/or amend as appropriate the SER enclosed with Reference (c) to clarify the definition of a pilot cell at Vermont Yankee.
Should you have any questions with regard to this request, please contact this office.
Sincerely, VERMONT YANKEE NUCLEAR POWER CORPORATION N
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Leonard A. Tremblay, Jr., P.E.
Senior Licensing Engineer cc:
USNRC Region I Administrator USNRC Resident Inspector-VYNPS USNRC Project Manager-VYNPS
.