BVY 10-047, Revision of Technical Specifications Bases Page
| ML102360179 | |
| Person / Time | |
|---|---|
| Site: | Vermont Yankee File:NorthStar Vermont Yankee icon.png |
| Issue date: | 08/18/2010 |
| From: | Wanczyk R Entergy Nuclear Operations |
| To: | Document Control Desk, Office of Nuclear Reactor Regulation |
| References | |
| BVY 10-047 | |
| Download: ML102360179 (4) | |
Text
'0 Entergy Entergy Nuclear Operations, Inc.
Vermont Yankee 320 Governor Hunt Rd Vernon, VT 05354 Tel 802 257 7711 Robert J. Wanczyk Licensing Manager BVY 10-047 August 18, 2010 ATTN: Document Control Desk U.S. Nuclear Regulatory Commission Washington, DC 20555
SUBJECT:
REFERENCE:
Revision of Technical Specifications Bases Page Vermont Yankee Nuclear Power Station Docket No. 50-271 License No. DPR-28 Letter USNRC to Entergy, "Vermont Yankee Nuclear Power Station -
Issuance of Amendment RE: Primary Containment Isolation Valves (TAC No. MB3431)," dated August 21, 2002
Dear Sir or Madam:
This letter provides a revised Vermont Yankee (VY) Technical Specification (TS) Bases page. The VY TS Bases were revised to relocate the basis for the main steam isolation valve (MSIV) closure time surveillance to the VY Technical Requirements Manual (TRM). TS Table 4.7.2 "Primary Containment Isolation Valves," which contains the MSIV closure time, was relocated to the TRM by the referenced letter.
These changes, processed in accordance with our TS Bases Control Program (TS 6.7.E), were determined not to require prior NRC approval. The revised Bases page is provided for your information and for updating and inclusion with your copy of the VY TS. No NRC action is required in conjunction with this submittal.
There are no new regulatory commitments being made in this submittal.
Should you have any questions concerning this submittal, please contact me at 802-451-3166.
Sincerely,.
RJW/PLC A coll'
BVY 10-047 / Page 2 of 2
Attachment:
- 1.
Revised Technical Specifications Bases Page cc:
Regional Administrator, Region 1 U.S. Nuclear Regulatory Commission 475 Allendale Road King of Prussia, PA 19406-1415 Mr. James S. Kim, Project Manager Division of Operating Reactor Licensing Office of Nuclear Reactor Regulation U.S. Nuclear Regulatory Commission Mail Stop 08C2A Washington, DC 20555 USNRC Resident Inspector Entergy Nuclear Vermont Yankee, LLC 320 Governor Hunt Rd.
Vernon, Vermont 05354 Mr..David O'Brien, Commissioner VT Department of Public Service 112 State Street - Drawer 20 Montpelier, Vermont 05620-2601
BVY 10-047 Docket No. 50-271 Vermont Yankee Nuclear Power Station Revised Technical Specifications Bases Page
VYNPS BASES:
4.7 (Cont'd)
D.
Primary Containment Isolation Valves Those large pipes comprising a portion of the reactor coolant system whose failure could result in uncovering the reactor core are supplied with automatic isolation valves (except those lines needed for emergency core cooling system operation or containment cooling).
The closure times specified herein and per Specification 4.6.E are adequate to prevent loss of more cooling from the circumferential rupture of any of these lines outside the containment than from a steam line rupture.
Therefore, the isolation valve closure times are sufficient to prevent uncovering the core.
Purge and vent valve testing performed by Allis-Chalmers has demonstrated that all butterfly purge and vent valves installed at Vermont Yankee can close from full open conditions at design basis containment pressure.
However, as an additional conservative measure, limit stops have been added to valves 16-19-7/7A, limiting the opening of these valves to 500 open while operating, as requested by NRC in their letter of May 22, 1984.
(NVY 84-108)
The main steam isolation valves are primary containment isolation valves and are tested in accordance with the requirements of the Inservice Testing program.
The containment is penetrated by a large number of small diameter instrument lines.
The flow check valves in these lines are tested for operability in accordance with Specification 4.6.E.
E.
Reactor Building Automatic Ventilation System Isolation Valves (RBAVSIVs)
In the event that there are one or more RBAVSIVs inoperable when secondary containment integrity is required, the affected penetrations that have been isolated must be verified to be isolated on a periodic basis.
This is necessary to ensure that those penetrations required to be isolated following an accident, but no longer capable of being automatically isolated, will be in the isolated position should an event occur.
The verification frequency of once per 31 days is appropriate because the valves are operated under administrative controls and the probability of their misalignment is low.
Verification of isolation does not require any testing or device manipulation.
- Rather, it involves verification that the affected penetration remains isolated.
The RBAVSIVs covered by this surveillance requirement, along with their test requirements, are included in the Inservice Testing Program.
Amendment No.
4-,
4-2-2, 4-8-5, 4-94, 2-2-3, BVY 10-047 171