ML20205R907

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Forwards Second Request for Addl Info Re Response to GL 95-07, Pressure-Locking & Thermal-Binding of Safety-Related Power-Operated Gate Valves, for Beaver Valley Power Station,Units 1 & 2
ML20205R907
Person / Time
Site: Beaver Valley  FirstEnergy icon.png
Issue date: 04/20/1999
From: Dan Collins
NRC (Affiliation Not Assigned)
To: Cross J
DUQUESNE LIGHT CO.
References
GL-95-07, GL-95-7, TAC-M93429, TAC-M93430, NUDOCS 9904230371
Download: ML20205R907 (7)


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% *a... April 20,1999 Mr. J. E. Cross President-Generation Group Duquesne Light Company Post Office Box 4 Shippingport, P/.15077

SUBJECT:

SECOND REQUEST FOR ADDITIONAL INFORMATION (RAl) REGARDING RESPONSE TO GENERIC LETTER (GL) 95-07, " PRESSURE-LOCKING AND THERMAL BINDING OF SAFETY-RELATED POWER-OPERATED GATE VALVES," BEAVER VALLEY POWER STATION, UNITS 1 AND 2 (BVPS-1 AND .

BVPS-2)(TAC NOS. M93429 AND M93430)

Dear Mr. Cross:

On August 17,1995, the Nuclear Regulatory Commission (NRC) issued 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 and thermal binding are capable of performing their safety functions.

On February 13,1996, DLC submitted its 180-day response to GL 95-07 for Beaver Valley Power Station, Units 1 and 2 (BVPS-1 and BVPS-2). The NRC staff reviewed the licensee's submittals and requested additional information in a letter dated June 24,1996. DLC provided  ;

a response to the request for additional information (RAI) by letter dated July 24,1996.

The NRC staff has been reviewing your submittals, however, we have determined that additionalinformation is required to complete our review. The requested information was discussed with Messrs. J. Maracek, S. Loehlein, F. Gardner, and S. Hovanec of your staff during a March 10,1999, conference call. The NRC requests that you provide your response to the enclosed RAI within 60 days of receipt of this letter. This was discussed with Mr.

J. Mi. acek of your staff, and was established as a mutually agreeable timetable for your response. If circumstances result in the need to revise the target date, please call me at the ;

earliest possible opportunity. I oI E [$5,bd0b M

-m4 9904230371 990420 PDR ADOCK 05000334 P PDR

J. Cross 2 If you have any questions regarding this request, please contact me at (301) 415-1427.

Sincerely,

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Daniel S. Collins, Project Manager, Section 1 Project Directorate l Division of Licensing Project Management Office of Nuclear Reactor Regulation Docket Nos. 50-334 and 50-412

Enclosure:

Request for Additional Information cc w/ encl: See next page l..

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April 21,1999 l

l J. Cross  !

I If you have any questions regarding this request, please contact me at (301) 415-1427.

l Sincerely, Original sir;ned by:

Daniel S. Collins, Project Manager, Section 1 Project Directorate i Division of Licensing Project Management Office of Nuclear Reactor Regulation Docket Nos. 50-334 and 50-412

Enclosure:

Request for Additional Information cc w/ encl: See next page DISTRIEUTION:

Docket File ACRS

'UBLIC DCollins PEselgroth, RGN-l PDI-1 R/F OGC DTerao JZwolinski/SBlack STingen SBajwa DOCUMENT NAME
G:\ BEAVER \RAIA9605.WPD To receive a copy of this document, indicate in the box: "C" = Copy without attachment / enclosure "E" = Copy with attachment / enclosure "N" = No copy 0FFICE PDI 1/Petypf lE PDI 1/LA , % f /, l PDI-1/SC ,, d l l l NAME DCollinsQbe M0'Brien ll" " SBajwa /b7 M DATE 04/10/99 04/ k//99 04/fD/99 Officia1' Record Copy l

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April 21,1999 J. Cross If you have any questions regarding this request, please contact me at (301) 415-1427.

Sincerely, Original signed by:

l Daniel S. Collins, Project Manager, Section 1 Project Directorate 1

, Division of Licensing Project Management

! Office of Nuclear Reactor Regulation l

1 Docket Nos. 50-334 and 50-412 l

Enclosure:

Request for Additional l Information i

i l cc w/ encl: See next page l

l DISTRIBUTION:

Docket File ACRS PUBLIC DCollins PEselgroth, RGN-l  !

, PDI-1 R/F OGC DTerso JZwolinski/SBlack STingen SBajwa l

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! DOCUMENT NAME: G:\ BEAVER \RAIA9605.WPD To receive a copy of this document, indicate in the box: "C" = Copy without attachment / enclosure "E" = Copy with rttachment/ enc!asure "N" = No copy OFFICE P01 1/PIb3 pf lE PDI 1/LA My'4//Yl PDI 1/SC ,,,g h l l l )

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Seelwa /li3 M OATE 04/ F /99 06/!(//99 04/4D/99 Official' Record Copy l

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Beaver Valley Power Station, Units 1 and 2 Jay E. Silberg, Esquire Duquesne Light Company Shaw, Pittman, Potts & Trowbridge Beaver Valley Power Station 2300 N Street, NW. PO Box 4 4 Washington, DC 20037 Shippingport, PA 15077 -

ATTN: Kevin L. Ostrowski, Division Vice Duquesne Light Company President, Nuclear Operations Group Safety and Licensing Department and Plant Manager (BV SOSB-7)

Mark S. Ackerman, Manager (2 Copies)

Beaver Valley Power Station Bureau of Radiation Protection PO Box 4, BV-A Pennsylvania Department of Shippingport, PA 15077 Environmental Protection ATTN: Michael P. Murphy Commissioner Roy M. Smith Post Office Box 2063 West Virginia Department of Labor Harrisburg, PA 17120 Building 3, Room 319 Capitol Complex Mayor of the Borough of Charleston, WV 25305 Shippingport Post Office Box 3 Director, Utilities Department - Shippingport, PA 15077 Public Utilities Commission 180 East Broad Street Regional Administrator, Region l l Columbus, OH 43266-0573 U.S. Nuclear Regulatory Commission  !

475 Allendale Road i Director, Pennsylvania Emergency King of Prussia, PA 19406 Management Agency Post Office Box 3321 Residerit Inspector Harrisburg, PA 17105-3321 U.S. Nuclear Regulatory Commission i Post Office Box 298 i Ohio EPA-DERR Shippingport, PA 15077 ATTN: Zack A. Clayton 1 Post Office Box 1049 Duquesne Light Company l Columbus, OH 43266-0149 Beaver Valley Power Station PO Box 4 Dr. Judith Johnsrud Shippingport, PA 15077 National Energy Committee ATTN: S. C. Jain, Senior Vice President Sierra Club Nuclear Services (BV-A) 433 Orlando Avenue State College, PA 16803 Mr. J. A. Hultz, Manager l Projects & Support Services l First Energy l 76 South Main Street Akron, OH 44308

SECOllD REQUEST FOR ADDITIONAL INFORMATION REGARDING RESPONSE TO GENERIC LETTER 95-07 FOR BEAVER VALLEY POWER STATION UNIT NOS.1 AND 2 DOCKET NOS. 50-334 AND 50-412

1. The Nuclear Regulatory Commission (NRC) request for information dated June 24,1996, asked if the pressurizer power operated relief valve block valves were susceptible to pressure locking during a steam generator tube r#ure accident. Duquesne Light Company's (DLC's) response dated July 24,1996, stat'.sd that the valves were sized to open with primary pressure

, on one side and ambient pressuro on the other side. Your reasoning that the valves will operate during pressure locking conditions becacse the actuators are sized to operate during differential pressure conditions does not appear tc >rovide a sound basis to preclude pressure locking in these valves. Either clarify your basis or provide appropriate actions to ensure that pressure locking is not a concem for these valves.

2. DLC's submittal dated July 24,1996, states that Unit 1 charging to reactor coolant system hot leg injection valves, MOV-SI-869A/B, are not susceptible to pressure locking because there are redundant hot leg flow paths, the valves leak and that the valves are not required to be opened until 14.5 hours5.787037e-5 days <br />0.00139 hours <br />8.267196e-6 weeks <br />1.9025e-6 months <br /> after initiation of the accident. The NRC considers that if the plant's licensing basis requires redundant hot leg flow paths then all the flow paths must be evaluated for pressure locking. Explain the plant's licensing basis requirements for valves MOV-SI-869A/B to open. Valve leakage can be used to demonstrate that valves will not pressure lock provided that the valves are periodically leak checked. Discuss if valves MOV-St-869A/B are periodically leak checked. The NRC has accepted that pressure will decay from a valve's bonnet after approximately 12 hours1.388889e-4 days <br />0.00333 hours <br />1.984127e-5 weeks <br />4.566e-6 months <br /> provided that the temperature of the valve does not increase during the 12-hour period. Describe the temperature of valves MOV-SI-869A/B during the 14.5 hour5.787037e-5 days <br />0.00139 hours <br />8.267196e-6 weeks <br />1.9025e-6 months <br /> period after initiation of an accident. Either clarify your basis or provide appropriate actions to ensure that pressure locking is not a concem for these valves.
3. DLC's submittal dated February 13,1996, states that an evaluation concluded that Unit 1 charging to reactor coolant system alterncte cold leg injection valve, MOV-SI-836, was not susceptible to pressure locking. Discuss why MOV-SI-836 is not susceptible to pressure locking and include in the discussion the plant's licensing basis requirements for the valve to open and if the valve is periodically leak checked.

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4. DLC's submittal dated February 13,1996, states that valve leakage will prevent Unit 2 l residual heat removal system retum line to safety injection isolation valves,2RHS-MOV720A/B l from pressure locking. Valve leakage can be used to demonstrate that valves will not pressure j lock provided the valves are periodically leak checked. Discuss when the plant's licensing  ;

basis requires the valves to open and if the valves are periodically leak checked. The NRC J has accepted that pressure will decay from a valve bonnet after approximately 12 hours1.388889e-4 days <br />0.00333 hours <br />1.984127e-5 weeks <br />4.566e-6 months <br /> j provided that the temperature of the valve does not increase during the 12-hour period.  ;

Describe the temperature of valves 2RHS-MOV720A/B if applicable. Either clarify your basis {

or provide appropriate actions to ensure that pressure locking is not a concem for these l valves. I l

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5. Explain why Unit 2 recirculation system spray to safety injection valves,2 SIS-MOV8811A/B, l

safety injection to charging system valves,2 SIS-MOV863A/B, and safety injection pump i recirculation valves,2 SIS-8890A/B, are not susceptible to pressure locking.

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