ML20196J701

Forwards Second Request for Addl Info Re GL 95-07, Pressure Locking & Thermal Binding of Safety-Related Power-Operated Gate Valves

ML20196J701
Person / Time
Site:	Seabrook
Issue date:	06/30/1999
From:	Harrison J NRC (Affiliation Not Assigned)
To:	Feigenbaum T NORTH ATLANTIC ENERGY SERVICE CORP. (NAESCO)
References
GL-95-07, GL-95-7, TAC-M93517, NUDOCS 9907070401
Download: ML20196J701 (6)

Text

r 5, 3 ' Mr. Ted C. Falg:nbrurn Juna 30, 1999

. Extcutivs Vics Pruidant end .

Chist Nucl:ar Officsr North Atlantic Energy Service Corporation

c/o Mr. James M. Peschel -

P.O.- Box 300 l Seabrook, NH 03874

SUBJECT:

- SECOND REQUEST FOR ADDITIONAL INFORMATION - GENERIC LETTER 95-07, " PRESSURE LOCKING AND THERMAL BINDING OF SAFETY-L RELATED POWER-OPERATED GATE VALVES," SEABROOK STATION, l: UNIT 1 (TAC NO. M93517)

Dear Mr. Feigenbaum:

On August 17,1995, the NRC issued Generic Letter (GL) 95-07, " Pressure Locking and Thermal Binding of Safety-Related Power-Operated Gate Valves," to request that licensees take actions to ensure that safety-related power-operated gate valves that are susceptible to pressure locking or thermal binding are capable of performing their safety functions.

L in a letter dated February 13,1996, North Atlantic Energy Service Corporation (North Atlantic) submitted its 180-day response to GL 95-07 for Seabrook Station, Unit 1. The NRC staff

,  : reviewed the licensee's submittal and requested additional information in a letter dated July 17, 1996. In a letter dated August 15,1996, you provided the requested information.

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l The staff has reviewed North Atlantic's GL 95-07 submittals for Seabrook Station, Unit 1, and

~ has determined that additional information is necessary to complete its safety evaluation. The enclosed request for additional information (RAI) was discussed with Jeff Sobotka of your staff i on May 20,1999, and it was agreed that your response would be submitted within 45 days of

- the dato of this letter GL 95-07 includes a description of the regulatory basis for this request. ,

if you have any questions regarding this matter, or if circumstances result in the need to revise j the target date, please call me at the earliest opportunity. I may be reached at (301) 415-3199.

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Sincerely, ORIGINAL SIGNED BY: l John T. Harrison, Project Manager, Section 2 Project Directorate i Division of Licensing Project Management <

l Office of Nuclear Reactor Regulation Docket No.: 50-443 5

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p 4- . UNITED ITATES j j- 'dUCLEAR REGULATORY COMMISSION WASHINGTON, D.C. 20066-0001 N June 30, 1999

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Mr. Ted C. Feigenbe am .. _

Executive Vice Prer dent and

' Chief Nuclear O'icer North Atlantic Ene gy Service Corporation Je/o Mr. James M. Peschel -

P.O. Box 300 -

Seabrook, NH I 3874 -

SUBJECT:

1ECOND REQUEST FOR ADDITIONAL INFORMATION - GENERIC LETTER )

95-07, " PRESSURE LOCKING AND THERMAL BINDING OF SAFETY-  ;

RELATED POWER-OPERATED GATE VALVES," SEABROOK STATION, j UNIT 1 (TAC NO. M93517)

Dear Mr. Fe ,

genbaum: l On Augus' 17,1995, the NRC issued Generic Letter (GL) 95 07, " Pressure Locking and Thermal Fanding of Safety-Related Power-Operated Gate Valves," to request that licensees

' take acti(j is to ensure that safety-related power' operated gate valves that are susceptible to pressure Qocking or thermal binding are capable of performing their safety functions.

In a lett' r dated February 13,1996, North Atlantic Energy Service Corporation (North Atlantic) .

submittsd its 180-day response to GL 95-07 for Seabrook Station,' Unit 1. The NRC staff {

review ld the licensee's submittal and requested additional information in a letter dated July 17, 1996./In a letter dated August 15,1996, you provided the requested information.

~ The t!.aff has reviewed North Atlantic's GL 95-07 submittals for Seabrook Ration, Unit 1, and has determined that additional information is necessary to complete its safety evaluation. The encfhsed request for additionalinformation (RAl) was discussed with Jeff Sobotka of your staff on // lay 20,1999, and it was agreed that your response would be submitted within 45 days of th(r.iate of this letter. GL 95-07 includes a description of the regulatory basis for this request.

If Au have any questions regarding this matter, or if circumstances result in the need to revise the target date, please call me at the earliest opportunity. I may be reached at (301) 415-3199.

Sincerely. -

><W lohn T. Harrison, Project Manager, Section 2 P oject Directorate I' Division of Licensing Project Management Office of Nuclear Reactor Regulation Docket No.: 50-443

Enclosure:

RAI cc w/encif See next page s :- 3

.I!

m Seabrook Station, Unit No.1 cc:

Lillian M. Cuoco, Esq. Mr. Peter LaPorte, Director Senior Nucle'ar Counsel ATTN: James Muckerneide

' Northeast Utilities Service Company Massachusetts Emergency Management L P.O.' Box 270 Agency Hartford, CT 06141-0270. 400 Worcester Road P.O. Box 1496 Mr. Peter Brann _ Framingham, MA 01701-0317-l Assistant Attomey General State House, Station #6 Philip T. McLaughlin, Attorney General Augusta, ME 04333 _ Steven M. Houran, Deputy Attorney General Resident inspector 33 Capitol Street U.S. Nuclear Regulatory Commission Concord, NH 03301 i Seabrook Nuclear Power Station i

P.O. Box 1149 Mr. Woodbury Fogg, Director Seabrook, NH 03874 _ New Hampshire Office of Emergency Management Jane Spector State Office Park South L Federal Energy Regulatory Commission 107 Pleasant Street l 825 North Capital Street, N.E. Concord, NH 03301 l

Room 8105 i Washington, DC 20426 Mr. Roy E. Hickok  !

l Nuclear Training Manager Town of Exeter Seabrook Station l 10 Front Street - North Atlantic Energy Service Corp.  !

Exeter, NH 03823 P.O. Box 300 l Seabrook, NH 03874 l

Regional Administrator, Region I U.S. Nuclear Regulatory Commission Mr. James M. Peschel L475 Allendale Road ~ Manager of Regulatory Compliance King of Prussia, PA 19406 Seabrook Station North Atlantic Energy Service Corp. 1

' Office of the Attomey General P.O. Box 300 One Ashburton Place Seabrook, NH 03874 20th Floor Boston, MA 02108 Mr. W. A. DiProfio Station Director Board of Selectmen Seabrook Station  !

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- Town of Amesbury North Atlantic Energy Service Corporation Town Hall' P.O. Box 300 Amesbury, MA 01913 Seabrook, NH 03874 Mr. Dan McElhinney Mr. Frank W. Getman, Jr.

Federal Emergency Management Agency 20 Intemational Drive Regior3 i Suite 301

' J.W. McCormack P.O. & Portsmouth, NH 03801-6809 Courthouse Building, Room 401 Boston, MA 02109 -

4 k

r Mr. B. D. Kenyon President - Nuclear Group Northeast Utilities Service Group _

P.O. Box 128 Waterford, CT 06385 Mr. David E. Carriere ,

Director, Production Services Canal Electric Company 2421 Cranberry Highway - '

Wareham, MA 02571 Mr. David A. Lochbaum Nuclear Safety Engineer Union of Concerned Scientists

- 1616 P Street, NW, Suite 310, Washington, DC 20036-1495 i

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SECOND REQUEST FOR ADDITIONAL INFORMATION SEABROOK STATION. UNIT 1 RESPONSE TO GENERIC LETTER 95-07.

" PRESSURE LOCKING AND THERMAL BINDING OF SAFETY-RELATED POWER-OPERATED GATE VALVES"

1. Your August 15,1996, submittal states that the charging pump discharge to the cold leg valves, SI-V138 and SI-V139, are not susceptible to pressure locking because a charging pump is operating when the valves receive a signal to open. The staff requests that North Atlantic Energy Service Corporation reevaluate the potential for valves SI-V138 and SI-V139 l to pressure lock in the event that a charging pump is not operating when the valves receive l a signal to open and discuss the results of the evaluation. The evaluation should explain (1) when the valves are sequenced to au'omatically open in relationship to the automatic restart of a charging pump on a loss of off-site power concurrent with a loss of coolant accident, (2) if there are any pressure locking scenarios where the valves will operate at locked rotor conditions until a charging pump develops full discharge pressure, and (3) if applicable, long-term corrective action, and any short-term corrective action to ensure operability if long-term corrective action is not complete.

The NRC has approved the operation of motor-operated valve motor actuators for approximately 1 second at locked rotor conditions as acceptable corrective action for Generic Letter (GL) 95-07 because testing performed by Idaho National Engineering &

Environmental Laboratory (NUREG/CR-6478) demonstrated that the capability of the actuator does not degrade for that period of time. If applicable, explain how long valves SI-V138 and SI-V139 would operate at locked rotor conditions. If greater than approxirrately 1 second, then explain how any reduction in actuator capability due to operation at locked rotor was accounted for or describe any testing that demonstrates that actuator capability will or will not degrade after operating at locked rotor for greater than approximately 1 second.

During a telephone conversation conducted on May 20,1999, you stated that you were considering the use of the Commonwealth Edison (Comed) pressure locking thrust prediction methodology to demonstrate that the valves would operate during pressure-locking conditions. Comed recommends that, when using its pressure locking thrust prediction methodology, minimum margins snould be applied between calculated pressure locking thrust and actuator capability. These margins along with diagnostic equipment accuracy and methodology limitations are defined in a letter from Comed to the NRC dated May 29,1998 (Accession Number 9806040184). The NRC considers the use of the Comed pressure locking methodology an acceptable long-term correctivd action provided these margins, diagnostic equipment accuracy requirements and methodology limitations are incorporated into the pressure locking calculations, if applicable, discuss how you implemented the Comed pressure locking thrust prediction methodology guidelines discussed in the May 29,1998, letter.

2. Your GL 96-07 submittals do not address if the residual heat removal (RHR) to safety injection and charging pump suction valves, RH-V35 and RH-V36, are susceptible to pressure locking. The NRC staff requests that North Atlantic Energy Service Corporation discuss the potential for valves RH-V35 and RH-V36 to pressure lock in the event that ENOLOSURE L

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.(1) the bonnets of these valves become pressurized during shutdown cocling or RHR pump surveillance evolutions, and then required to operi tater at a lower RHR pump discharge pressure, (2) if the temperature of these valves increases when operating the RHR system during a plant heatup, and (3) if applicable, long-term corrective action, and any short-term corrective action to ensure operability if long-term corrective action is not complete.

During a telephone conversation conducted on May 20,1999, you stated that you were considering the use of the Comed pressure locking thrust prediction methodology to demonstrate that the valves would operate during pressure-locking conditions. If applicable and not previously addressed, discuss how you implemented the Comed pressure locking thrust prediction methodology guidelines discussed in the May 29,1998, letter.

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