ML19290B859
| ML19290B859 | |
| Person / Time | |
|---|---|
| Site: | Vermont Yankee File:NorthStar Vermont Yankee icon.png |
| Issue date: | 10/30/1979 |
| From: | Moody D VERMONT YANKEE NUCLEAR POWER CORP. |
| To: | Grier B NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I) |
| References | |
| IEB-79-24, NUDOCS 7912140260 | |
| Download: ML19290B859 (1) | |
Text
ceWoaer VERMONT Y AN KEE NUCLEAR POWER CORPORATION 4
B.4.2.1 U
SEVENTY SEVEN GROVE STREET WVY 79-128 RUTLAND, VERMONT 05701 October 30, 1979 EN EERING OFFICE TURNPIKE RO AD WEST 00RO, M ASSACHUSETTS 01581 United States Nuclear Regulatory Commission Region I 631 Park Avenue King of Prussia, PA 19406 Attention:
Office of Inspection and Enforcement Mr. Boyce H. Grier, Director
References:
(1) License No. DPR-28 (Docket No. 50-271)
(2) USNRC Letter to VYNPC dated September 27, 1979
Dear Sir:
Subject:
Response to IE Bulletin 79-24; Frozen Lines Reference (2) requested that all licensees review their plants to determine that adequate protective measures have been taken to assure that safety-related process, instrument, and sampling lines do not freeze during extremely cold weather.
We have performed the required review of our facility and conclude that adequate protective measures have previously been taken to assure that safety-related process, instrument and sampling lines do not freeze during extremely cold weather.
Although we found no evidence at all of frozen lines associated with the High Pressure Coolant Injection System (HPCI), we have previously experienced cold weather difficulties at our intake structure, cooling tower deep basin, external fire protection system, exposed Reactor Building ventilation valves, diesel generator rooms, and fuel oil transfer pumps.
Each of these areas has been satisfactorily resolved during the seven years of operation of our facility.
As a result of our protective measures, Vermont Yankee experienced no operational difficulties during a record breaking cold weather period in February 1979 when local temperatures remained below 00F at night and never rose above 15.60F during the daytime for nine consecutive days.
We trust that you find this information satisfactory; however, if you should require additional information, please contact us.
Very truly yours, VERMONT YANKEE NUCLEAR POWER CORPORATION
%. C.
D. E. Moody 3g
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