ML20199J654

Forwards Request for Addl Info Re 960208,0621 & 26 Response to 950817 GL 95-07, Pressure-Locking & Thermal-Binding of Safety-Related Power-Operated Gate Valves

ML20199J654
Person / Time
Site:	Vermont Yankee
Issue date:	11/24/1997
From:	Jabbour K NRC (Affiliation Not Assigned)
To:	Reid D VERMONT YANKEE NUCLEAR POWER CORP.
References
GL-95-07, GL-95-7, TAC-M93533, NUDOCS 9711280187
Download: ML20199J654 (3)

Text

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j. ^ Mr. Donald A. Reid November.24. 1997 L Senicr Vice President, Operations:

Vermont Yankee Nuclear Power Corporation 185 Old Ferry Road Brattleboro, VT 05301

SUBJECT:

- M QUEST FOR ADDITIONAL INFORMATION - GENERIC LETTER 95-07, YRESSURE-LOCKING .AND THERMAL-BINDING OF SAFETY-RELATED POWER-0PERATED GATE VALVES" - VERMONT YANKEE NUCLEAR POWER-STATION (TAC NO. M93533)

Dear Mr. Reid:

On August 17, 1995, the NRC issued Generic Letter (GL) 95-07, " Pressure-Locking and Thern.al-Binding of Safety-Related Power-0perated Gate Valves,"

to request that licensees take actions to ensure that safety-related power-operatii gate valves that are susceptible to pressure-locking or thermal-binding are capable of performing their safety functions.

The NRC :.taff has reviewed your GL 95-07 submittals dated February 8, and June 21 and 26, 1996, for the Vermont Yankee Nuclear Power Station. Based on its review, the staff finds that respor.ses to.the enclosed request for additional-information are needed before we can complete our review.

Please )rovide your responses within 30 days from the date of this letter.

If you lave any questions regarding this matter, please contact me at (301) 415-1496.

Sincerely, Criginal signed by Kahtan N. Jabbour, Sr. Project Man:

Project Directorate I-3 Division of Reactor Projects - I/II Office of Nuclear Reactor Regula+ >on l Docket No. 50-271

Enclosure:

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Mr. Dsnald A. Reid Vermont Yankee' Nuclear Power Vermont Yankee Nuclear Power Station -!

Corporation-cc:- _

Mr. Peter LaPorte, Director 2 -Regional Administrator,-Region I ATTN: James Muckerheide

U. S.-Nuclear Regulatory Commission - Massachusetts Emergency Management-g 475 Allendale Road Agency

King of Prussia, PA- 19406 400 Worcester Rd.

1 P.O. Box 1496

- Mr. David-R._ Lewis

Framingham, MA 01701-0317' Shaw Pittman, Potts L Trowbridge 2300 N Street,-N.W. Mr. Raymond N. McCandless-Washington, DC~ 20037-1128 Vermont Division of Occu)ational and Radhlogical Healt)

--Mr. Richard P. Sedano, Commissioner Administ;ation Building Vermont Department' of Public Service Montpelier, VT 05602 120 State Street, 3rd Flo>r

- Montpelier, VT 05602- Mr. J. J. Duffy

- Licensing Engineer Public Service Board Vermont Yankee Nuclear Power

, State of Vermont Corporation

' 120 State _ Street 580 Main Street Montpelier, VT 05602' Bolton, MA 01740-1398 Chairman.--Board of Selectmen Mr. Robert J. Wanczyk

. Town of Vernon Director of Safety and Regulatory

: P.O. Box Il6 Affairs Vernon,-VT 05354-0116 Vermont Yankee Nuclear Power Corp.

185 Old Ferry Road

, Mr. Richard E. McCullough- Brattleboro, VT 05301

-Operating Experience Coordinator

. Vermont: Yankee Nuclear Power Station Mr. Ross B. Barkhurst, President P.O.cBox 157 Vermont Yankee Nuclear Power Governor Hunt = Road Corporation Vernon, VT 05354 185 Old Ferry Roa.1 Brattlaboro,-VT- 05301 G.-Dana Bisbee, Esq.

[ Deputy Attorney General Mr. Gregory A. Maret, Plant Manager 33 Capitol Street Vermont Ynkee Nuclear Power Station Concord, NH 03301-6937' P.O. Bcx 157 Governor hunt Road 1 Resident Inspector Vernon, *T 05354

~ Vermont-Yankee Nuclear Power Station U.S..Nuciear Regulatory Commission Ms. Deborah'B. Katz

,- - P.O. Box:176 Box 83

, -Vernon,.YT 05354 Shellburne Falls, MA :01370 i Chief, - Safety. Unit Mr. Jonathan M. Block, Esq.

_ Office of the Attorney General - Main Street One: Ashburton Place,19th-Floor- - P.O. Box 566

- Boston, MA 02108- Putney, VY 05346-0566-i i

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i RE00EST FOR ADDITIONAL INFORMATION VERMONT YANKEE NUCLEAR POWER STATION RESPONSES TO GENERIC LETTER 95-07.

" PRESSURE-LOCKING AND THERMAL-BINDING OF SAFETY-RELATED POWER-OPERATED GATE VALVES" Docket No. 50-271

1. The February 8,1996 submittal states that valves V10-15A/B/C/D, V10-17, and V10-18, Residual Heat Removal Pump Suction, have a safety function to i close and do not have a safoty function to open. Therefore, Vermont Yankee Nuclcar Power Corporation did not include these valves in the scope of GL 95-07. These valves are opened to initiate shutdown cooling in order to cooldown the unit following a reactor shutdown. Does the licensing basis for Vermont Yankee Nuclear Power Station require that the unit be cooled down following a reactor shutdown? If so, what safety-related systems are used to accomplish the cooldown7 Valves that are required to open in order to meet 10 CFR 50, Appendix R, requirements are not in the scope of GL 95-07. The NRC staff is not requesting that you address Appendix R shutdown /cooldown requirements when responding to this request for additional information.

2. The February 8,19s6 submittal states that valves V10-26A, Residual Heat Pemoval Drywell Spray, V23-14, High Pressure Coolant Injection Steam Admission, and V23-20, High-Pressure Coolant Injection Test, would be modified to prevent pressure locking during the 1996 refueling outage.

Please confirm that these modifications were completed as scheduled.

3. The February 8, submittal states that valves V10-31A/B, Residual Heat Removal Containment Spray, are not susceptible to pressure locking.

Discuss why these valves are not susceptible to pressure locking. If your oressure locking evaluation assumes that upstream valves V10-26A/B do not leak by the seat, describe seat leakage test results that demonstrate that-the valves do not leak. l i

i Enclosure

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