ML20097F807

Provides Response to GL 95-07, Pressure Locking & Thermal Binding of Safety-Related Power Operated Gate Valves

ML20097F807
Person / Time
Site:	Beaver Valley
Issue date:	02/13/1996
From:	George Thomas DUQUESNE LIGHT CO.
To:	NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM)
References
GL-95-07, GL-95-7, NUDOCS 9602200144
Download: ML20097F807 (14)

Text

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Teephone (410 39360 Nuclear Group Qp n February 13, 1996 eo PA 1%77M4 U. S. Nuclear Regulatory Commission Attention: Document Control Desk Washington, DC 20555-0001

Subject:

Beaver Valley Power Station,' Unit No. I and No. 2 BV-1 Docket No. 50-334, License No. DPR-66 BV-2 Docket No. 50-412, License No. NPF-73 180-Day Response to Generic Letter 95-07

References:

1.

"NRC Generic Letter 95-07: Pressure Locking and Thermal Binding of Safety-Related Power Operated Gate Valves," dated August 17, i

1995.

2.

DLC Submittal, " Sixty-Day Response to Generic Letter 95-07," dated October 16,1995.

3.

NRC Letter, " Pressure Locking and Thermal Binding Meeting," dated September 27,1995.

4.

NRC Letter, " Comments Regarding Duquesne Light Company's 60-Day 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 (TAC Nos. M93429 and M93430)," dated November 3,1995.

j 5.

DLC Submittal, " Additional Information in Response to Generic j

Letter 95-07," dated November 15,1995.

In response to Generic Letter (GL) 95-07, Duquesne Light Company (DLC) submitted its action plan (Reference 2) to evaluate power-operated gate valves for susceptibility to pressure locking and thermal binding.

The action plan was in l

accordance with the request of the generic letter to complete the evaluations within 180 days of the date of the generic letter. At the time of the DLC submittal, efforts to accomplish the action plan were underway.

i Based on DLC's submittal (Reference 2), the NRC staff determined that further information was required to ensure that DLC's previous evaluations had considered recent infonnation and that the specified 90-day actions would be completed.

In i

9602200144 960213 0

PDR ADOCK 05000334 P

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7 Beaver Villey Power Station, Unit No. I and No. 2 180-Day Response to Generic Letter 95-07 Page 2 response to the request (Reference 4), DLC notified the NRC that the 90-day actions had been completed as clarified at the Region I Meeting announced by Reference 3.

This letter provides the 180-Day Response as specified in GL 95-07.

If there are questions regarding this letter, please contact Roy K. Brosi, Manager, Nuclear Safety Department at (412) 393-5210.

Sincerely,

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=3 George S. Thomas Vice President Nuclear Planning and Development c:

Mr. L. W. Rossbach, Sr. Resident Inspector Mr. T. T. Martin, NRC Region I Administrator Mr. D. S. Brinkman, Sr. Project Manager

AFFIDAVIT COMMONWEALTH OF PENNSYLVANIA)

) SS:

COUNTY OF BEAVER

)

Subject:

Beaver Valley Power Station, Unit No. I and No. 2 BV-1 Docket No. 50-334, License No. DPR-66 BV-2 Docket No. 50-412, License No. NPF-73 180-Day Response to Generic Letter 95-07 Before me, the undersigned notary public, in and for the County and Commonwealth aforesaid, this day personally appeared George S. Thomas, to me known, who being duly sworn according to law, deposes and says that he is Vice President, Nuclear Planning and Development of the Nuclear Power Division, Duquesne j

Light Company, he is duly authorized to execute and Ble the foregoing submittal on behalf of said Company, and the statements set forth in the submittal are true and correct to the best of his knowledge, infonnation and belief.

6

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" George S. Thomas 1

Subscribed and sworn to before me Z @d4g, NN I

on this/

day of

\\ bad (ob)mI Notarv Piiblic NatW9ed hosrABuceekgPitte MyD Edes Aug.

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Attachment 180-Day Response to Generic Letter 95-07 for Beaver Valley Power Station Units No. I and No. 2 February 1996 l

Summary of Scope Duquesne Light Company (DLC) personnel of the Beaver Valley Power Station (BVPS) have completed a susceptibility evaluation of valves within the scope of NRC Generic Letter 95-07:

" Pressure Locking and Thermal Binding of Safety-Related Power-Operated Gate Valves" (POGVs).

A total of 68 BVPS Unit No. I air operated, hydro-pneumatic and motc'-operated safety-related gate valves were reviewed and a total of 84 similar valves for BVPS Unit No. 2 were reviewed.

A Pressure Locking and Thermal Binding Matrix for these valves is attached. Each POGV was reviewed for susceptibility to four distinct events: stem-effect thermal binding, wedge-effect thermal binding, hydraulic pressure locking and thermally induced pressure locking. The POGVs were evaluated for operation during normal and emergency plant operation, shutdown operation and test configurations. Because of the expanded scope of GL 95-07, previous work performed to evaluate pressure locking and thermal binding was not utilized to exclude valves from consideration.

Stem-effect thermal binding (TB) is dermed as the additional load imposed upon a closed valve disc due to stem lengthening from internal or external heat sources. The lengthening of the stem pushes on the valve operator on one side and pushes on the valve wedge on the other. This load is expected to make it more dimcult to open the affected valve. Wedge-effect thermal binding develops from the compressive force imposed upon a valve wedge from its own valve body due to differential thermal expansion / contraction of the materials of both the valve and wedge. Wedge-effect thermal binding makes it more dimcult to open a closed gate valve due to the increased friction force imposed upon the wedge that the operator must overcome. Hydraulic pressure locking (PL) occurs when high pressure fluid leaks into the bonnet cavity of a closed gate valve and pressurizes it. If the high pressure fluid is unable to bleed out before the valve must open, it will be more di5 cult for the valve operator to open the valve as it now needs to pull the wedge against this additional pressure force. Thermally induced pressure locking occurs when a water filled bonnet cavity of a closed gate valve is heated by internal or external system heat sources which raises the pressure of the contained fluid. In a manner similar to hydraulic PL, the pressurized fluid imposes additional forces on the valve wedge making it more di5 cult for the valve operator to open the valve.

In order to determine the susceptibility of these valves to either PL or TB, a 3-page screening evaluation form was prepared for each valve. This screening methodology determined that 24 valves in Unit No. I and 36 valves in Unit No. 2 were potentially susceptible to the GL 95-07 concerns. _

O 9

DLC participated with the Westinghouse Owners Group (WOG) to develop specific GL 95-07 PL and TB susceptibility criterh. This criteria was used to evaluate the potentially susceptible valves A summary of this criteria follows.

Wedge-effect thermal binding is not considered credible for valves with operating temperatures less than 200 F, or if the expected change in temperature is less than 100*F for flex-wedge POGVs or 50 F for solid-wedge POGVs.

A parallel dise POGV is not considered susceptible to TB due to inherent design features.

A solid wedge POGV is not considered susceptible to PL due to inherent design features.

When thermally-induced pressure locking is analyzed, a pressure rise of 23 psi per F will be assumed. This value is conservative for moderate temperature rises.

POGVs susceptible to PL will bleed off the differential pressure between the pressurized bonnet and the valve body in 24 hours2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br />.

A valve stem leak-off does not provide a bonnet relief path for PL, unless it has physical features which provide a controlled leak path.

Check valves are assumed to leak pressure back to the POGV under review, even if there are as many as 3 or 4 check valves between the pressure source and the POGV.

Pressurized fluid which leaks back from a high pressure source through closed valves or check valves are limited in pressure to applicable relief valve set points.

Nine (9) valves in Unit No. I and seventeen (17) valves in Unit No. 2 were found susceptible in varying degrees to at least one criteria of the GL 95-07 PL or TB phenomena. Of these valves, four (4) valves in Unit No. I and ten (10) valves in Unit No. 2 had previously been determined to be susceptible to some form of PL or TB in earlier technical evaluations for the BVPS Units, and appropriate resolutions, as indicated in the matrix, have been implemented.

1 The valves that were determined susceptible to at least one of the' GL 95-07 PL or TB criteria, and the resolution of their susceptibility concerns, are described below.

BVPS Unit No.1 1

MOV-SI-867A, B, C, D l

1 These safety injection system (SIS) valves isolate the boron injection tank (BIT) from normal i

Unit operating systems. MOV-SI-867A & B isolate the BIT inlet from chemical and volume i

control system (CHS); MOV-SI-867C & D isolate the BIT outlet from the reactor coolant system (RCS). MOV-SI-867A & B were determined susceptible to hydraulic pressure i

locking during a previous evaluation in 1994 and have been modified through disc drilling to d

negate the PL susceptibility. MOV-SI-867C & D were determined susceptible to GL 95-07 pressure locking. The present operability of the C and D valves is assured by large thrust

]

margins as shown by dynamic testing at 100% of design differential pressure. MOV-SI-867C l

& D valves will be modified similar to the 867A & B valves during Unit No l's eleventh refueling outage and twelfth refueling outage, respectively, to prevent potential future degradation.

MOV-SI-860A, B These SIS valves open during the transition from SIS injection phase to SIS recirculation phase in order to provide a flowpath from the containment sump to the suction of the Low Head Safety Injection pumps. The valves were determined susceptible to hydraulic pressure locking during a previous evaluation, and determined potentially susceptible' to thermal binding during the GL 95-07 evaluation.

The hydraulic pressure locking concern was eliminated when the valves were confirmed to have an installed relief path between each valve's bonnet and its upstream pipe.

A containment sump temperature analysis in 1995 determined that differential temperatures which could potentially be experienced by the valves are within the screening criteria values; hence thermal binding will not occur.

MOV-RC-535, 536, 537 These reactor coolant system valves can be used to isolate the power operated relief valves (PORVs) during normal plant operation to isolate a leak. The valves' safety function is to close, but it may be necessary to open them to restore an isolated PORV to service. The valves are susceptible to GL 95-07 thermal binding. PORV block valve TB susceptibility will be negated by revising existing valve operating procedures to require an additional opening and closing stroke (prior to declaring the block valve operable) whenever a block valve has been closed to isolate' a leaking PORV. The procedure revision will be completed by April 30, 1996. This additional valve movement will occur after thermal stabilization, so that it will verify component operability and the absence of any GL 95-07 PL or TB phenomena. Note Hydrotest Boundary Valves Any closed power-operated flex-wedge gate valve used as a hydrotest pressure boundary is considered potentially susceptible to GL 95-07 hydraulic pressure locking. Therefore, in order to alleviate this potential concern, applicable hydrotest procedures will either confirm operability of such valves following any pressurized test or provide suflicient time for pressure bleed-off. The administrative guidelines which are used to prepare the hydrotest procedures i

will be revised by July 31, 1996, to include the appropriate instructions for procedure preparation.

BVPS Unit No. 2 2RHS-MOV701 A,701B,702A,702B These four residual heat removal valves provide redundant system isolation between the RCS loop A hot leg and the inlet to the residual heat removal system (RHS). The valves were determined susceptible to hydraulic pressure locking during a previous evaluation.

During the Unit's construction phase, the RHS inlet valves had the upstream side of their flexible wedges drilled through to allow a bonnet relief path. The drilled wedges relieve hydraulic pressure locking.

2RHS-MOV720A, B These residual heat removal discharge valves provide system isolation between the two RHS loops and RCS loop B and C cold legs. The valves are susceptible to GL 95-07 hydraulic pressure locking.

j Evaluation of system operation requirements determined that sufficient time will elapse between the occurrence of the hypothetical pressurized bonnet and the necessity to stroke the valve so that GL 95-07 hydraulic pressure locking will bleed away. Therefore, the RHS discharge valves will not be modified.

2 SIS-MOV867A, B, C, D These safety injection system valves provide redundant system isolation between the chemical and volume control system and the RCS during normal plant operation. 2 SIS-MOV867A &

B are system inlet isolation valves; 2 SIS-MOV867C & D are system outlet isolation valves.

Valves 867A & B were determined susceptible to hydraulic pressure locking during a previous evaluation. Valves 867C & D were determined susceptible to GL 95-07 pressure locking.

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i 2 SIS-MOV867A & B had the upstream side of their flexible wedges drilled through to allow a l

bonnet relief path during the Unit's construction phase.

System outlet isolation valves l

l 2 SIS-MOV867C & D, while presently operable based on existing valve operator margins, will l

have their discs modified in a similar manner during Unit No. 2's sixth refueling outage, i

presently scheduled for the fall of 1996.

{

2 SIS-MOV869A, B l

i These safety injection system valves provide system isolation between the CHS and the RCS i

hot legs. The valves would be manually opened 141 hours0.00163 days <br />0.0392 hours <br />2.331349e-4 weeks <br />5.36505e-5 months <br /> after a safety injection event to j

enable a transfer to hot leg recirculation. The valves were determined susceptible to hydraulic pressure locking during a previous evaluation.

i 1

i During the Unit's construction phase, these two SIS - valves had the upstream side of their flexible wedges drilled through to allow a bonnet relief path. The drilled wedges relieve i

hydraulic pressure locking.

l 2 SIS-MOV8889 This safety injection system valve isolates the RCS hot legs from the low pressure SI system.

The valve would be manually opened approximately 14 hours1.62037e-4 days <br />0.00389 hours <br />2.314815e-5 weeks <br />5.327e-6 months <br /> after an SI event to enable the recirculation spray system (RSS) pumps to inject directly into the RCS. The valve was determined susceptible to hydraulic pressure locking during a previous evaluation.

During the Unit's construction phase, this SIS valve had the upstream side of its' flexible f

wedge drilled through to allow a bonnet relief path. The drilled wedge relieves hydraulic pressure locking.

2 SIS-MOV836 This safety injection system valve is manually opened after the completion of the Unit's transfer from SIS injection phase to SIS recirculation phase to establish a redundant cold leg injection flowpath. The valve was found susceptible to hydraulic pressure locking during a previous evaluation.

During the Unit's construction phase, this SIS valve had the upstream side of its flexible wedge drilled through to allow a bonnet relief path. The drilled wedge relieves hydraulic l:

pressure locking.

i I -

2RCS-MOV535, 536, 537 These reactor coolant system valves can be used to isolate the power operated relief valves (PORVs) during normal plant operation to isolate a leak. The valves' safety function is to close, but it may be necessary to open them to restore an isolated PORV to service. The heat tracing installed on and about these block valves can produce potential pressure locking or thermal binding conditions, depending upon the operational conditions at the time. Note that all these valves are presently open and operable.

The potential for pressure locking occurs if a PORV block is isolated and its associated heat tracing is de-energized. Prior to re-opening the valves, normal operational procedures require the heat tracing to be re-energized. Since the valve bonnet could have become water filled while it was closed, the potential for pressure locking could be created. The fact that these valves are normally open and their primary safety function is to close and isolate the reactor coolant system suggests that it would not be prudent to attempt to mitigate potential pressure locking through establishment of vent paths. If a closed valve failed to reopen to restore its associated PORV to normal service, then it would be necessary to enter applicable Tech Spec action statements. The Tech Specs would require resolution of such an event within 72 hours8.333333e-4 days <br />0.02 hours <br />1.190476e-4 weeks <br />2.7396e-5 months <br />.

Because differential pressure in a valve's bonnet is expected to bleed offin 24 hours2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br /> or less, the possibility of a pressure locked block valve interfering with normal plant operation is considered a low and acceptable risk.

The potential for thermal binding occurs only in the case in which a PORV block valve is closed in response to a leaking PORV which is still useful and necessary as a vent path. In this case, the heat tracing is de-energized after the block valve is closed, and remains de-energized. Since the heat tracing is de-energized after the block valve is closed, the potential for wedge-effect thermal binding could be created. Therefore, procedures will be revised by April 30,1996, to require an opening / closing stroke (prior to declaring the block valve operable) whenever a block valve has been closed to isolate a PORV. This stroke will occur after thermal stabilization, so that it will verify component operability and the absence of GL 95-07 thermal binding. In normal plant operating circumstances, the heat tracing is re-energized prior to re-opening a block valve. This action will return the valve to the same j

thermal state which existed when it was closed.

l Hydrotest Boundary Valves Any closed power-operated flex-wedge gate valve used as a hydrotest pressure boundary is considered potentially susceptible to GL 95-07 hydraulic pressure locking. Therefore, in order to alleviate this potential concern, applicable hydrotest procedures will confirm operability of such valves following any pressurized test, or provide suflicient time for pressure bleed-off.

The administrative guidelines which are used to prepare the hydrotest procedures will be revised by July 31,1996, to include the appropriate instructions for procedure preparation.

6-

Prassurs Locking and Thermal Binding M:trix Pege 1 STEM WEDGE THERMALLY UNIT 1 EFFECT -

EFFECT HYDRAUUC INDUCED VALVEIDENT.

VALVE TYPE TYPE FUNCTIONAL DESCRIPTION THERMAL' THERMAL PRESSURE PRESSURE RESOLUTION BINDING BINDING LOCKING LOCKING HTV.AS.101A PLEX 9MIGE 9 HY V aux sismanesotATuossg

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MOV-CH-1158 FLEX WEDGE MOV RWST TO CH PUMP SUCTtDN HDR MOV-CH-115C FLEX WEDGE MOV VCT TO CH PUMP SUCTION HOR MOV-CH-115D FLEX WEDGE MOV RWST TO CH PUMP SUCTION HOR MOV CH-115E FLEX WEDGE MOV VCT TO CH PUMP SUCTION HDR MOV-CH-289 FLEX WEDGE MOV CHARO900 MtET ISOL POTENTIALLY Satisfactory try Evolumeen MOV-CH-310 FLEX WEDGE MOV REGEN MX DtSCH ISOL POTENTIALLY POTENTIALLY Satisfactory by Evaluseen MOV-CH-350 SPUT WEDGE MOV EMER 90 RATION ISOL gy@gygMKW43ggghgggWJ?ggygggM'Ogd 9#"F

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MOV-CH-378 SPLIT WEDGE MOV RCP SW RETURN ISOL MOV-CH-381 SPUT WEDGE MOV RCP SW RETURN ISOL MOV-MS-105 SOUD WEDGE MOV aux FEED PUMP TURS STM SUPPLY POTENTIALLY POTENTIALLY Seesfactory by Evaluecen MOV-OS-100A SOLID WEDGE MOV QS P 1 A SUCTeON tSOL MOV-OS-1008 SOUD WEDGE MOV OS P'te SUCTa0N ISOL MOV-OS-101 A SOUD WEDGE MOV QSP-1A DISCH ISOL MOV-OS-1018 SOUD WEDGE MOV QS-P is OfSCH ISOL MOV-OS-103A FLEX WEDGE MOV OSP-1 A MifdFLOW1 CUTBACK MOV-OS-1038 FLEX WEDGE MOV QS P'in Mw&FtowiCUTsACK MOV-RC-535 FLEX WEDGE MOV PORv PCv-RC-45sc STOCK SUSCEPTIBLE Procedure Change MOV-RC-536 FLEX WEDGE MOV PORv PCv-RC ase BLOCK SUSCEPTIBLE Procedure Change MOV-RC-537 FLEX WEDGE MOV PORV PCV-AC-4650 BLOCK SUSCEPTIBLE Procedure Change MOV-RC-590 PARALLEL DISK MOV RCS LOOP A HOT LEO ISOL MOV-RC-591 PARALLEL DISK MOV RCS LOOP A COLD LEG ISOL MOV-RC-592 PARALLEL DISK MOV RCS LOOP B HOT LEO ISOL MOV-RC-593 PARALLEL DtSK MOV RCS LOOP B COLD LEO ISOL MOV-RC-594 PARALLEL DISK MOV RCS LOOP C HOT LEG ISOL MOV-RC-595 PARALLEL DISK MOV RCS LOOP C COLD LEO ISOL MOV-RH-700 PARALLEL DISK MOV RH FROM RCS iSOt POTENTIALLY POTENTIALLY Satisfactory by Evalustsen MOV-RH-701 PARALLEL DISK MOV RH FROM RCS ISOL POTENTIALLY Setiefectory by Evetuation l

MOV-RH-720A PARALLEL DISK MOV RH RETURN TO RCS ISOL POTENTIALLY Senefectory by Evaeustion MOV-RH-7208 PARALLEL DISK MOV RH RETURN TO RCS ISOL POTENTIALLY Satisfactory by Evatustion MOV-RS-155A SOUD WEDGE MOV OUTSfDE RS P-1 A SUCTION ISOL MOV-RS-1558 SOUD WEDGE MOV OUTSIDE RSP-19 SUCTION ISOL MOV-RS-156A SOUD WEDGE MOV OUTSIDE RS-P'1 A DISCH ISOL MOV-RS-1568 SOUD WEDGE MOV OUTSIDE RS P 18 DISCH ISOL MOV-RW-113A SOUD WEDGE MOV EE-E-1 A RW SUPPLY tSOL b

MOV-RW-1138 FLEX WEDGE MOV EE-E-1 A RW SUPPLY ISOL MOV-RW-113C FLEX WEDGE MOV EE-E-18 RW SUPPLY ISOL MOV-RW-113D1 FLEX WEDGE MOV EE-E 1B RW SUPPLY ISOL MOV-St-836 FLEX WEDGE MOV ACL COLO LEO SuPPtY rROM CH PUMP POTENTIALLY POTENTIALLY Satisfactory by Evatustian MOV-St-860A SPUT WEDGE MOV SFP'1 A SUCTEDN ISOL POTENTIALLY SUSCEPTIOLE TB-Set by Evaluation /PL Bonnet vent MOV-SI-8608 SPUT WEDGE MOV SFPL1B SUCTION ISOL POTENTIALLY SUSCEPTIBLE TB-Sat. by Evaluation /PL Bennet vent MOV-SI-862A SPLIT WEDGE MOV SFP 1 A RWST SUCT90N ISOL POTENTIALLY Sotiefectory by Evalueteen mee ees =

NOTE: Shaded valves have *NO Safety Related Function to Open*.

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Przssure Locking and Thermil Binding Matrix Page 2 /

STEM WEDGE THERMALLY UNIT 1 EFFECT EFFECT HYDRAUllC INDUCED VALVEIDENT.

VALVE TYPE TYPE FUNCTIONAL DESCRIPTION THERMAL THERM /L L PRESSURE PRESSURE RESOLUTION BINDING BINDING LOCKING LOCKING MOV-SI-862B SPLIT WEDGE MOV SFP 1B RWST SUCTION ISOL POTENTIALLY Satisfactory by Evolustion MOV-SI-863A SOUD WEDGE MOV SFP-1 A TO CH IMJMP SUCTION HDR MOV-SI-863B SOLID WEDGE MOV S&P 1B TO CH PUMP SUCTION HDR MOV-SI-864A FLEX WEDGE MOV S -P te m; TO RCS COLD LEO POTENTIALLY Setiefectory by Evolueten MOV-SI-8648 FLEX WEDGE MOV S&P.in mj TO RCS COto tEo POTENTIALLY Satisfactory by Evoluetmn

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NOTE: Shaded valves have "No Safety Related Function to Open".

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L PresSura Locking and Therrnal Binding M;trix Page 1 e

STEM WEDGE THERMALLY UNIT 2 EFFECT EFFECT HYDRAULIC INDUCED VALVE IDENT.

VALVE TYPE TYPE FUNCTIONAL DESCRIPTION THERMAL THERMAL PRESSURE PRESSURE RESOLUTION BINDING BINDING LOCKING LOCKING 2CHS-LCV115B FLEX WEDGE MOV 2CHS*P21 HEADER SUPPLY FROM RWST POTENTIALLY Satisf actory by Evaluation 2CHS-LCV115C FLEX WEDGE MOV 2CHS*P21 HEADER SUPPLY FROM VCT POTENTIALLY Satisfactory by Evolustion 2CHS-LCV115D FLEX WEDGE MOV 2CHS*P21 HEADER SUPPLY FROM RWST POTENTIALLY Satisfactory by Evolustion 2CHSLCV115E FLEX WEDGE MOV 2CHS*P21 HEADER SUPRV FROM VCT POTENTIALLY Satisfactory by Evolustion 2CHS.MOViiI iFLEX WEDGE

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""*W **"N" 2CHS-MOV289 FLEX WEDGE MOV CHARGING tlNE ISOLATION POTENTIALLY Satisf actory by Evolustion 2CHSMOV310 FLEX WEDGE MOV CHARGING TO RCS ISOLATION POTENTIALLY POTENTIALLY POTENTIALLY Satisfactory by Evaluation MOVf 2CHs r2iA.sgsnettFtowIsolitse5 9MI "W

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2CHSMOV378 FLEX WEDGE MOV 2RCS*P21 SEAL WATER HEADER ISOL 2CHSMOV381 FLEX WEDGE MOV 2RCS*P21 SE AL WATER HEADER ISOL 2CHS-MOV8130A FLEX WEDGE MOV CHARGING PUMP SUCTION ISOLATION POTENTIALLY Satisfactory by Evaluation 2CHSMOV8130B FLEX WEDGE MOV CHARGING NMP SUCTION ISOLATION POTENTIALLY Satisfactory by Evaluation 2CHS-MOV8131 A FLEX WEDGE MOV 2CHS*P21 SUCTION HE ADER ISOLATION POTENTIALLY Satisfactory by Evolustion 2CHS-MOV81318 FLEX WEDGE MOV 2CHS*P21 SUCTION HEADER ISOLATION POTENTIALLY Satisfactory by Evolustion 2CHS MOV8132A FLEX WEDGE MOV 2CHS*P21 DISCHARGE HE ADER ISOt POTENTIALLY POTENTIALLY Satisfactory by Evaluation 2CHSMOV8132B FLEX WEDGE MOV 2CHS*P21 DISCHARGE HEADER ISOt POTENTIALLY POTENTIALLY Satisfactory by Evolustion 2CHS-MOV8133A FLEX WEDGE MOV 2CHS*P21 DtSCHARGE HEADER ISOL POTENTIALLY POTENTIALLY Satisf actory by Evaluation 2CHS-MOV81338 FLEX WEDGE MOV 2CHS*P21 DISCHARGE HEADER ISOL '

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HYV :2tC 80 FEEDWATER ISOL.

2OSS-MOV100A FLEX WEDGE MOV OSS PUMP SUCTION ISOLATION 20SS-MOV1008 FLEX WEDGE MOV OSS NMP SUCTION ISOLATION 20SS-MOV101 A FLEX WEDGE MOV OSS PUMP DISCHARGE tSotATION 2QSS-MOV1018 FLEX WEDGE MOV OSS PUMP DfSCHARGE tSOLATION 2OSS-MOV102 A FLEX WEDGE MOV QSS CHEM INJECTION PUMPISOLATION 20SS-MOV1028 FLEX WEDGE MOV OSS CHEM INJECTION PUMP fSOLATION 2RCS-MOV535 FLEX WEDGE MOV RCS PORV ISOLATION BLOCK SUSCEPTIBLE SUSCEPTIBLE TB Proc. change /PL-Set. by Evolustion 2RCS-MOV536 FLEX WEDGE MOV RCS PORV TSOLATION BLOCK SUSCEPTIBLE SUSCEPTIBLE TB-Proc. change /PL-Set. by Eeelustion 2RCS-MOV537 FLEX WEDGE MOV RCS PORV ISOL ATION BLOCK SUSCEPTIBLE SUSCEPTIBLE TB-Proc. change /PL-Set, by Evaluation 2RCS-MOV590 PARALLEL DISK MOV RCS LOOP A HOT LEG ISOLATION 2RCS-MOV591 PARALLEL DISK MOV RCS tOOP A COLD LEO ISOLATION 2RCS-MOV592 PARALLEL DISK MOV RCS LOOP B HOT LEG iSOL ATION 2RCS-MOV593 PARALLEL DISK MOV RCS LOOP B COtD LEG ISOLATION 2RCSMOV594 PARALLEL DISK MOV RCS LOOP C HOT LEG ISOLATION 2RCS-MOV595 PARALLEL DISK MOV RCS LOOP C COLD LEO ISOLATION 2RHS-MOV701 A FLEX WEDGE MOV RHS PUMP SUPPLY tSOL ATION SUSCEPTIBLE Modified 2RHS-MOV 7018 FLEX WEDGE MOV RHS PUMP SUPPLY lSOLATION SUSCEPTIBLE Modified 2RHS-MOV702A FLEX WEDGE MOV RHS PUMP SUPPLY tSOLATION SUSCEPTIBLE Modified 2RHS-MOV702B FLEX WEDGE MOV RHS PUMP SUPPLY ISOLATION SUSCEPTIBLE Modified 2RHSMOV720A FLEX WEDGE MOV RHS TO StS RETURN LINE ISOLATION SUSCEPTIBLE Procedures allow time for bleshown.

2RHS-MOV7208 FLEX WEDGE MOV RHS TO SFS RETURN LINE ISOLATION SUSCEPTIBLE Procedures effow time for bleed-down.

2RSS-MOV154C FLEX WEDGE MOV RSS PUMP MINI FLOW ISOLATION POTENTIALLY Satisf actory by Evolustion 2RSSMOV1540 FLEX WEDGE MOV RSS PUMP MINI-FLOW tSOLATION POTENTIALLY Satisfactory by Evolustion 2RSS-MOV156A FLEX WEDGE MOV RSS PUMP DISCHARGE ISOLATlON eme e n am NOTE: Shaded valves have "NO Safety Related Function tO Open" nmem ms

F Pressure Locking and Thermal Binding Mitrix Page 2 e

STEM WEDGE THEftMALLY UNIT 2 EFFECT EFFECT HYDRAULIC INDUCED VALVEIDENT.

VALVE TYPE TYPE FUNCTIONAL DESCRIPTION THERMAL THERMAL PRESSURE PRESSURE RESOLUTION BINDING BINDING LOCKING LOCKING 2RSS-MOV1568 FLEX WEDGE MOV RSS PUMP DISCHARGE ISOLATION 2RSS-MOV156C FLEX WEDGE MOV RSS PUMP D:SCHARGE ISOLAT90N 2RSS-MOV156D FLEX WEDGE MOV RSS PUMP DISCHARGE ISOLATION 2 SIS-MOV836 FLEX WEDGE MOV CHS TO RCS COLD LEG NJECTION ISOL SUSCEPTIBLE Modified 2StS-MOV841 FLEX WEDGE MOV CHS TO RCS COLD t FG NKCTION ISOt POTENTIALLY POTENTIALLY Satisfactory by Evolustion 2 SIS-MOV863A FLEX WEDGE MOV SlS PUMP DtSCHARGE ISOLATION POTENTIALLY Satisf actory by Evolustion 2 SIS-MOV8638 FLEX WEDGE MOV SIS PUMP DtSCHARGE ISOLATsON POTENTIALLY Setiefectory by Evolustion yggn 3y y

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2"""FG W i FLEX WEDGE J 2 SIS-MOV867A FLEX WEDGE MOV BORON NJECTION INLET ISOLATION SUSCEPTIBLE Modified 2 SIS-MOV867B FLEX WEDGE MOV BORON NKCTION NLET ISOLATION SUSCEPTIBLE Modified 2 SIS-MOV867C FLEX WEDGE MOV BORON INJECTDON ISOLATION SUSCEPTIBLE SUSCEPTIBLE To be Modified 2 SIS-MOV867D FLEX WEDGE MOV BORON INECTION ISOLATION SUSCEPTIBLE SUSCEPTIBLE To be Modified 2 SIS-MOV869A FLEX WEDGE MOV SrS TO RCS HOT LEO HE ADER ISOLATION SUSCEPTIBLE Modified 2 SIS-MOV8698 FLEX WEDGE MOV S S TO R",S HOT LEG HE ADER ' SOLATION SUSCEPTIBLE Modified 2Sts-MOV8809A FLEX WEDGE MOV SG PUMP SUCTION GOLATION 2Sts-MOV88098 FLEX WEDGE MOV sis PUMP SUCTtDN ISOLA 710N 2 SIS-MOV8811 A FLEX WEDGE MOV RSS IUMP OfSCH TO StS PIPING ISOL 2 SIS-MOV8811 B FLEX WEDGE MOV RSS PUMP DtSCH TO SIS PIPING ISOL 2 SIS.MOV888 7A FLEX WEDGE MOV S S PUMP DtSCH TO RCS HOT LEG iSOL 2 SIS-MOV8887B FLEX WEDGE MOV sis PUMP DtSCH TO RCS HOT LEO tSOL 2 SIS-MOV8888A FLEX WEDGE MOV StS PUMP DISCHARGE ISOLATION 2 SIS-MOV88888 FLEX WEDGE MOV StS PUMP DISCHARGE ISSLAT90N 2 SIS-MOV8889 FLEX WEDGE MOV SIS NMP DISCHARGE ISOLATtON SUSCEPTIBLE Mornfied 2StS-MOV8890A FLEX WEDGE MOV SIS PUMP MINI FLOW 2 SIS-MOV88908 FLEX WEDGE MOV SIS PUMP MINI-FLOW 2SWS-MOV104 A SOUD WEOGE MOV SWS SUPPLY TO RSS HX A GOL 2SWS-MOV104B SOLID WEDGE MOV SWS SUPPLY TO RSS HX B ISOL 2SWS MOV104C SOLID WEDGE MOV SWS SUPPLY TO RSS HX C GOL 2SWS-MOV104D SOLID WEDGE MOV SWS SUPPLY TO RSS HX D ISOL 2SWS-MOV105A SOLID WEDGE MOV SWS DtSCHARGE FROM RSS HX A ISOL 2SWS-MOV105B SOLID WEDGE MOV SwS DrSCHARGE FROM RSS HX B tSOL 2SWS-MOV105C SOLID WEDGE MOV SWS DtSCHARGE FROM RSS HX C ISOL 2SWS-MOV105D SOLID WEDGE MOV SWS DISCHARGE FROM RSS HX D ISOL 2SWS-MOV113 A SOUD WEDGE MOV SWS SUPPLY TO D/G HX tSOLATBON 2SWS-MOV113B SOUD WEDGE MOV SWS SUPPLY TO DIG HX ISOL 2SWS-MOV113C SOUD WEDGE MOV SWS SUPPLY TO D/G HK GOL 2SWS-MOV113D SOLID WEDGE MOV SWS SUPPLY TO D/G HX ISOLATION ww e., an.

NOTE: Shaded valves have "No Safety Related Function 10 Open".

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