ML19341B227
| ML19341B227 | |
| Person / Time | |
|---|---|
| Site: | Vermont Yankee File:NorthStar Vermont Yankee icon.png |
| Issue date: | 01/27/1981 |
| From: | Heider L VERMONT YANKEE NUCLEAR POWER CORP. |
| To: | Ippolito T Office of Nuclear Reactor Regulation |
| References | |
| FVY-81-15, NUDOCS 8101300487 | |
| Download: ML19341B227 (2) | |
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VERMONT Y AN N EE NUCLEAR POWJCR CORPOR ATION SEVENTY SEVEN GROVE STREET 2.C.2.1 RUTLAND. VF.RMONT 05701 FVY 81-15 REPLY TOs ENGINEERING OFFICE 1671 WORCESTER HOAD F R A kuNGH A M. M ASS ACHUS ETTs ot 7of itLEPHONt et7 872-8tOO
-3 January 27, 1981 wJ 23 United States Nuclear Regulatory Commission Washington, DC 20555 n;
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Attention:
Office of Nuclear Reactor Regulation Thomas A.
Ippolito, Chief Operating Reactor Branch #2 Division of Licensing Re ferences : (1) License No. DPR-28 (Docket No. 50-271)
(2) VYNPC Letter to l'ONRC dated October 11, 1978, WVY 78-92 (3) VYNPC Letter to USNRC dated July 27, 1979, WVY 79-83' (4) USNRC Letter to VYNPC dated September 24, 1980 (5) USNRC Letter to GE dated February 23, 1979 (6) USNRC Letter to VY dated August 7, 1978
Dear Sir:
Subject:
Reactor Protection System (RPS) Power Supply In References (2) and (3) Vermont Yankee committed to perform increased' surveillance and additional testing of the RPS Motar-Generator sets.
It was, and still is, our opinion that these changes, coupled with minor equipment-modifications, would satisfy the concerns regarding operability of the RPS Motor-Generator Sets.
However, Reference (4) states that the use of alarms or shift surveillance is only acceptable as an interim measure and not-adequate for the long-term solution.
For the long-term solution, modifications should be made to provide fully redundant Class IE protecti'on at the interface of the non-Class 1E power supplies and the RPS.
Consequently, as required by Reference'(4), Vermont Yankee proposes to install the required Class _-1E protective circuitry by the end of the next
~
refueling outage.
This commitment ~is made assuming that no unforeseen difficulties will be encountered in procuring the necessary equipment. Design information and proposed Technical Specifications for the-modified protective system will be submitted prior-to start up.
The protective circuitry packages we plan to use are similar to those which were found acceptable in References (4) and (5)..
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U.S. Nuclear Regulatory Commission January 27, 1981 Attention:
Mr. Thomas A.
Ippolito, Chief Page 2 k'e t ru s t that the information provided is adequate; however, should you have any questions, do not hesitate to call.
Very truly yours, VERMONT YANKEE NUCLEAR P0h'ER CORPORATION N
Y L. 11. He id e r Vice President SFU/kab l
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