ML20114B751
| ML20114B751 | |
| Person / Time | |
|---|---|
| Site: | Vermont Yankee File:NorthStar Vermont Yankee icon.png |
| Issue date: | 01/24/1985 |
| From: | Capstick R VERMONT YANKEE NUCLEAR POWER CORP. |
| To: | Eisenhut D Office of Nuclear Reactor Regulation |
| References | |
| RTR-NUREG-0737, RTR-NUREG-737, TASK-2.K.3.28, TASK-TM FVY-85-07, FVY-85-7, NUDOCS 8501290471 | |
| Download: ML20114B751 (2) | |
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VERMONT YANKEE NUCLEAR POWER CORPORATION RD 5. Box 169 Ferry Road, Brattleboro, VT 05301 y
ENGINEERING OFFICE FVY-85-07 1071 WORCESTER ROAD FRAMINGHAM, MASSACHUSETTS 01701 January 24, 1985 "f*"""
United States Nuclear Regulatory Conmission Washington, D. C. 20555 Attention:
Office of Nuclear Reactor Regulation Mr. D. C. Eisenhut, Director Division of Licensing
References:
(a) License No. DPR-28 (Docket No. 50-271)
(b) Letter, USNRC to VYNPC, NVY-84-166, dated July 16, 1984 (c) Letter, VYNPC to USNRC, FVY83-123, dated December 5, 1983 (d) Letter, VYNPC to USNRC, dated May 15, 1981 (e) Letter, VYNPC to USNRC, FVY84-107, dated September 7, 1984
Subject:
NUREG-0737. Item II.K.3.28, Request for Additional Information on the Qualification of ADS Accumuletors
Dear Sir:
In a recent phone conversation, your staff requested additional information concerning the qualification of Vermont Yankee's ADS accumulators. Our capabilities for long-term cooling, considering different scenarios, were described in our letter of September 7, 1984 [ Reference (c)].
As we stated, Vermont Yankee believes:
that the long-term cooling requirement as defined by 10CFR50.46 has been satisfied; that the ADS accumulators are capable of performing their intended functions as defined in the FSAR; and that the "100 day" capability is not required.
This letter provides the requested written summary of some additional information we discussed during our phone conversation, specifien11y, information regarding potential sources of nitrogen gas to the ADS accumulators.
In the event that the initial accumulator gas volume is exhausted, nitrogen gas' supply capability for the ADS accumulators could be supplied by the Liquid Nitrogen Storage Tank and Backup Nitrogen cas Cylinder Station discussed below, i
I The Liquid Nitrogen Storage Tank is described in Section 5.2 of the Vermont Yankee Final Safety Analysis Report. This storage tank is located outside the Reactor Building, has a capacity of 15,000 gallons and provides system operating pressure of 90-110 psig. The process piping and i
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United States Nuclear Regulatory Commission January 24, 1985 Attention:
Mr. D. C. Eisenhut Page 2 FVY-85-07 instrumentation for the nitrogen supply subsystem of the Primary Containment Atmosphere Control System is provided on Figure 5.2-7 of the VY FSAR. The Backup Nitrogen Gas Cylinder Station is shown on Figure 5.2-7 of the VY FSAR.
This station is located outside the Reactor Building and is comprised of 18 high pressure cylinders. Further, an additional potential backup supply to the accumulators is a compressed air source which can be cross-connected to the Nitrogen Supply System Piping. Flow diagrams of the Instrument Air System are provided on Figures 10.14-3 and 10.14-4 of the VY FSAR.
We trust this information is acceptable; however, should you have any questions or require any additional information, please contact me.
Very truly yours, Zad/
7 R. W. C pstick Licensing Engineer RWC/tja s
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