ML20073C951
| ML20073C951 | |
| Person / Time | |
|---|---|
| Site: | Farley  |
| Issue date: | 09/16/1994 |
| From: | Dennis Morey SOUTHERN NUCLEAR OPERATING CO. |
| To: | NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM) |
| References | |
| NUDOCS 9409260251 | |
| Download: ML20073C951 (24) | |
Text
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Southern Nvetear Operatmg Company ;
Post Office Box 1295 Birrmngnam. Atabama 35201 ;
Telephcne (205) 668 5131 L Q l i
omymy v,ce mesem Southern Nudear Operating Company 1 i
FMey Prcject h w , dhern 6ectrtC S)sferr I l
September 16, 1994 Docket No.: 50-364 U. S. Nuclear Regulatory Commission ATTN: Document Control Desk Washington, DC 20555 Joseph M. Farley Nuclear Plant Unit 2 Pump and Valve Insenice Testing Program Proposed Revisions to Relief Reauests for the Containment Sorav System Southern Nuclear Operating Company (SNC) herein submits revisions to the attached relief requests for the insenice testing of the Farley Nuclear Plant (FNP) Unit 2 containment spray system pumps and valves. The current relief requests contain statements referencing a proposed design modification which would install a test line to support full flow testing of the containment spray header check valves, refueling water storage tank (RWST) to containment spray pump suction line check valve, and contamment spray pumps. SNC has reevaluated this design modification and has determined that the marginal increase in testing capability associated with this change does not justify the expense and burden ofimplementing the modification. Therefore, the modihcation has been canceled.
The following factors were considered in the reevaluation of this modifi:ation:
- Safety - The safety / risk significance of this issue was evaluated using the FNP probabilistic risk assessment results. Containment spray system failure has no impact on the frequency of core danmge and only a minor impact on containment failure at FNP. In order to have a failure of containment, FNP would have to experience a large break loss of coolant accident followed by the loss of all four containment cooling fans and both trains of contaimnent spray.
Even in this highly unlikely event (less than 2 E-06 probability), containment failure would not occur until 35 hours4.050926e-4 days <br />0.00972 hours <br />5.787037e-5 weeks <br />1.33175e-5 months <br /> into the event and would result in minimal release of radioactisity to the atmosphere. Herefore, the reduction in overall safety at FNP resulting from the reduced testing capabilities associated with canceling this modification is negligible.
- Cost - The total design change cost is estimated to be $330,000 while the savings that would be produced by implementing the modification would be less than $3000 per year. Herefore, 9409260251 940916 y I PDR ADOCK 05000364 ' il P PDR i
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the net overall savings over the lifetime of the plant produced by canceling this modification is in excess of $200,000.
- Reliability - The reliability of these components is high based on the actual inspection and test results of the current FNP Unit 2 inservice testing program and preventative maintenance program. Additional assurance is provided by the satisfactory results of the full flow testing that is performed each refueling on the same type components in FNP Unit 1. These components are not in a problem location nor subjected to severe sersice conditions.
Implementing the modification would increase the number of system penetrations and welds, and therefore possibly reduce the overall system's reliability. A search of the NPRDS database showed an extremely low failure rate for the same type check valves as used in the FNP containment spray system.
- Test Options - A review of the current test practices, testing options, and potential design modifications showed that continuing the current test program is the most beneficial to Faricy Nuclear Plant based upon an overall evaluation of safety, cost, and reliability. SNC will continue to investigate future upgrades in technology that could provide additional capabilities for detecting component degradation in a cost-effective manner.
All of the attached relief requests are in compliance with the applicable ASME Section XI requirements and the positions delineated by the NRC in Attachment 1 of Generic Letter (GL) 89-
- 04. Disassembly and inspection of the RWST to containment spray pump suction line check valve is perfonned in accordance with NRC GL 89-04 Position 2. This position provides guidance which is to be considered when extending inspection frequency beyond each refueling outage. This guidance was considered and a disassembly and inspection frequency of every third refueling outage isjustified.
Attachment I contains the marked up versions of the current relief requests. Attachment 2 contains the revised relief requests.
This licensing action is estimated to save over $100,000 over the lifetime of the plant while having a marginal impact on safety. Therefore, this issue should be given priority as a Cost Beneficial Licensing Action (CBLA).
If you have any questions, please advise.
Respectfully submitted, 6)0 lll l Dave Morey ,
EFInk:q2el3rvi.&c
/dirtizuiw cc: Mr. S. D. Ebneter Mr. B. L. Siegel Mr. T. M. Ross
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ATTACilMENT I Marked-Up Versions of Current Relief Requests
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WITHDRAWN (Unit 2 modification of the containment spray system was canceled) i 4
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FNP-2-M4)67 PUMP RELIEF REQUEST PR-194 Version-1) l l
System: Residual IIcat Removal, Auxiliary Fcedwater (TDAFW)
Pump: P001 A-A, P001B-B, P002 l
l Class: 2, 3 Test Requirement: IWP-3100 requires that cach measured test quantity be enpared to the reference value of the same quantity. Any deviation dedenined shall be compared to the limits given in Table IWP-3100-2 as specified by IWP-3210.
Basis for Relief: Sectiun IWP-3100 requires quarterly pump testing to be performed by varying the system resistance until either the measured differential pressure or the measured flow rate equals the corresponding reference value, or by using a fixed resiasnce test flow path. The test flow paths used to test these pumps do not contain flow control provisions sufficiently accurate to repeat an exact reference condition.
/1 ernate Testing: Pump testing will be performed at conditions as close to the reference conditions as can be reasonably achieved and the test data compared with a curve of reference values that has been confirmed to represent a purnp in good operating condition. Alert and Action Ranges will be consistent with Table IWP-3100-2. Reference vibration levels will be established for discrete portions of the curve, as necessary.
Note: This-relief-teqMs-epplicable- tentiWi@ithification-whicWis-full-flow containmenspray-pumpfesting-irrimplemented:
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WITHDRAWN (Unit 2 modification of the containment sprav system was canceled) l i
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FNP-2-M-067 RELIEF REQUEST Q2El3-RV-1-(V:n;ica !) l System: Containment Spray Valve: QV002A, QV002B Category: C Class: 2 Function: Containment spray system inside containment isolation check salves ASME Section XI Quarterly Test Requirements: Verify forward-flow operability quarterly. (IWV-3521) ,
l Basis for Relief: The only way to verify full forward-flow operability during normal operating or cold shutdown would be by using the pumps and injecting a large quantity of water into the containment. Spraying the containment would result in extensive damage to safety-related equipment located inside the containment.
Partial exercising using air as a test medium is not possible during normal operation because Technical Specifications require primary containment integrity in operating modes 1 - 4 and attachment of test connections would violate containment integrity.
Alternate Testing: One of these valves will be disassembled and manually full stroke tested at each refueling on a staggered test basis. The valve internals will be verified as structurally sound (no loose or corroded parts) and the disk manually exercised to verify full stroke capability. If the disassembled valve is not capable of being full-stroke exercised or there is binding or failtre of valve internals, the remaining valve must also be disassembled, inspected, and manually full-stroke exercised during the same outage.
The disassembled valves will be part stroked with air flow after reassembly.
Flow indication will be through installed instrumentation, observed pressure 1 changes, level changes or through the use of ultrasonic (or similar) flow
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Additionally, these valves will be partially exercised using air as a test medium during cold shutdown. If multiple shutdowns occur, testing frequency is not to exceed quarterly.
Nc:e: Thinelief eque::i 0, p!!ableentil4he Un:: 2 :nodification-whichsupport fu!! f'cw .
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WITHDRAWN (Unit 2 modification (4 the containment spray system was canceled)
FNP-2-M-067 RELIEF REQUEST Q2E13-RV-3 (Venien !) l System: Containment Spray Valve: QV007A, QV007B Category: C Class: 2 Function: Spray additive tank to eductor line check valves.
ASME Section XI Test Requirements: Verify full forward-flow operability quarterly or at cold shutdown. (IWV-3521)
Basis for Relief: The only way to verify forward-flow operability is by measuring for design flowrate through the line while operating the containment spray pumps under design flow conditions. There are no system design provisions for performing full-flow pump testing. Quarterly pump testing is through a small 2-inch line from the pump discharge back to the RWST, With this test configuration, there is no flow through the valves, and testing for flow through the check valves is not possible without opening additional valves which will introduce sodium hydroxide into the RWST (ECCS water supply).
Alternate Testing: Valves will be partial flow tested quarterly during flushing in preparation for quarterly containment spray pump testing.
One of these vah es will be disassembled and manually full stroke tested at each refueling on a staggered test basis. The valve internals will be verified as structurally sound (no loose corroded parts) and the disk manually exercised to verify full stroke capability. If the disassembled valve is not capable of being ,
full-stroke exercised or there is binding or failure of valve internals, the remaining valve must also be disassembled, inspected, and manually full-stroke exercised during the same outage.
The disassembled valves will be part stroked with flow after reassembly. Flow indication will be through installed instrumentation, observed pressure changes, level changes or through the use of ultrasonic (or similar) flow measuring desices.
Net:: This+elief+equest is app!!:;h!: unti!4h: Unit 2 mcdificatica e.hich :;uppe-t: ful! '!cw contamrnent :;pmy pump te:: ting-isi np!:m:nt:.d.
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WITHDRAWN (Unit 2 modification of the containment sprav system was canceled)
1 FNP-2-M-067 RELIEF REQUEST Q2E13-RV1 (Vemien !) l System: Containment Spray Valve: QV014 Category: C Class: 2 Function: RWST to containment spray pump suction line check valve.
ASME Section XI Quarterly Test Requirements: Verify forward-flow operability. (IWV-3521)
Basis for Relief: The only way to verify forward-flow operability using flow would be by using the pumps and injecting a large quantity of water into the containment.
Spraying the containment would result in extensive damage to safety-related equipment located inside the containment.
There are no valves between QV014 and the RWST to shut off flow during valve disassembly. The vaht has been disassembled, inspected and manually full-stroke exercised fnIthree times since 1985 by freeze plugging the M-inch l linejust upstream of the valve. This has been done at refueling outages with the RWST drained to minimum level. In each case the valve was found to be in excellent condition, with no visible signs of degradation. The disassembly and insocction interval has been extended based on the hardship invohrd in oerforming a freeze seah excellent inspection results: low failure rates in the industry for this troe valve: and the valve's cood location. emironment. and gnice conditions.
Alternate Testing: The valve will bs, disassembled and manually full-stroke exercised once every three refueling outages using the freeze plug method described above. The valve internals will be verified as structurally sound (no loose or corroded parts) and the disk manually exercised to verify full stroke capability.
The disassembled valve will be part stroked with flow after reassembly. Flow indication will be through installed instrumentation, obsen'ed pressure changes, level changes or through the use of ultrasonic (or similar) flow measuring desices.
Additionally, this check vahr is partially exercised quarterly during containment spray pump surveillance testing when flow is recirculated to the RWST.
Nc::: niwelief requ:245 app!!: ble until4h Un t : 2 nelification*hich ::cpport:4ul! Pew : ing cf tiecontainment+ pray-pumpsh imp!:=ented.
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i FNP-2-M-067 1 RELIEF REQUEST 1
Q2E13-RV-4 (Version 2) i DELETED l
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Note-This =?!:f::qu=: b :pp!!;ik until the Uni 2 med!E : ! n ^.bh =ppe-:: ful! S0 ;::r.in;; cf the contai ==: p=y p=np:i:i nph=: ':f.
WITHDRAWN (Unit 2 modification of the containment sprav system was canceled)
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ATTACHMENT 2 Revised Relief Requests
FNP-2-M-067 PUMP RELIEF REQUEST PR-3 Intentionally Len Blank
(' Unit 1 Relief Request Not Applicable to Unit 2)
FNP-2-M-067 PUMP RELIEF REQUEST PR-3 (Version 2)
WITHDRAWN (Unit 2 modification of the containment spray system was canceled) f 5
FNP-2-M-067 PUMP RELIEF REQUEST PR-19 System: Residual Heat Removal, Auxiliary Feedwater (TDAFW)
Pump: P001 A-A, P001B-B, P002 Class: 2, 3 1 l
Test Requirement: IWP-3100 requires that each measured test quantity be compared to the reference value of the same quantity. Any deviation determined shall be compared to the limits given in Table IWP-3100-2 as specified by IWP-3210. ;
Basis for Relief: Section IWP-3100 requires quarterly pump testing to be performed by varying the system resistance until either the measured differential pressure or the measured flow rate equals the corresponding reference value, or by using a fixed resistance test flow path. The test flow paths used to test these pumps do not contain flow control provisions sufficiently accurate to repeat an exact reference condition.
Alternate Testing: Pump testing will be performed at conditions as close to the reference conditions as can be reasonably achieved and the test data compared with a curve of reference values that has been confirmed to represent a pump in good j operating condition. Alert and Action Ranges will be consistent with Table IWP-3100-2. Reference vibration levels will be established for discrete portions of the curve, as necessary.
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FNP-2-M-067 PUMP RELIEF REQUEST PR-19 (Version 2)
WITHDRAWN
- (Unit 2 modification of the containment spray system was canceled) 1.
t FNP-2-M-067 RELIEF REQUEST Q2E13-RV-1 System: Containment Spray Valve: QV002A, QV002B Category: C Class: 2 Function: Contamment spray system inside containment isolation check valves ASME Section XI Quarterly Test Requirements: Verify forward-flow operability quarterly. (IWV-3521)
Basis for Relief: The only way to verify full forward-flow operability during normal operating or cold shutdown would be by using the pumps and injecting a large quantity of water into the containment. Spraying the containment would result in extensive damage to safety-related equipment located inside the containment.
Partial exercising using air as a test medium is not possible during normal operation because Technical Specifications require primary containment integrity in operating modes 1 - 4 and attachment of test connections would violate containment integrity.
Alternate Testing: One of these valves will be disassembled and manually full stroke tested at each refueling on a staggered test basis. The valve internals will be verified as structurally sound (no loose or corroded parts) and the disk manually exercised to verify full stroke capability. If the disassembled valve is not capable of being i full-stroke exercised or there is binding or failure of valve internals, the j remaining valve must also be disassembled, inspected, and manually full-stroke exercised during the same outage. j The disassembled valves will be part stroked with air flow after reassembly. 1 Flow indication will be through installed instrumentation, observed pressure changes, level changes or through the use of ultrasonic (or similar) flow measuring devices.
Additionally, these valves will be partially exercised using air as a test medmm during cold shutdown. If multiple shutdowns occur, testing frequency is not to exceed quarterly.
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FNP-2-M 067 RELIEF REQUEST Q2E13-RV-1 (Version 2)
WITHDRAWN (Unit 2 modification of the containment spray system was canceled) i 1
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FNP-2-M-067 RELIEF REQUEST Q2E13-RV-3 System: Containment Spray Valve: QV007A, QV007B Category: C Class: 2 Function: Spray additive tank tu eductor line check valves.
ASME Section XI Test Requirements: Verify full forward-flow operability quarterly or at cold shutdown. (IWV-3521)
Basis for Relief: The only way to verify forward-flow operability is by measuring for design flowrate through the line while operating the containment spray pumps under design flow cmditions. There are no system design provisions for performing full-flow pump testing. Quarterly pump testing is through a small 2-inch line from the pump discharge back to the RWST. With this test configuration, there is no flow through the valves, and testing for flow through the check valves is not possible without opening additional valves which will introduce sodium hydroxide into the RWST (ECCS water supply).
Alternate Testing: Valves will be partial flow tested quarterly during flushing in preparation for quarterly containment spray pump testing.
One of these valves will be disassembled and mamially full stroke tested at each refueling on a staggered test basis. The valve internals will be verified as structurally sound (no loose corroded parts) and the disk manually exercised to verify full stroke capability, If the disassembled valve is not capable of being full-stroke exercised or there is binding or failure of valve internals, the remaining valve must also be disassembled, inspected, and manually full-stroke exercised during the same outage.
The disassembled valves will be part stroked with flow after reassembly. Flow indication will be through installed instrumentation, observed pressure changes, level changes or through the use of ultrasonic (or similar) flow measuring desices.
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FNP-2-M-067 RELIEF REQUEST Q2E13-RV-3 (Version 2)
WITHDRAWN (Unit 2 modification of the containment spray system was canceled) l
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FNP-2-M-067 RELIEF REQUEST Q2E13-RV-4 System: Containment Spray Valve: QV014 Category: C Class: 2 Function: RWST to containment spray pump suction line check valve.
ASME Section XI Quarterly Test Requirements: Verify forward-flow operability. (IWV-3521)
Basis for Relief: The only way to verify forward-flow operability using flow would be by using the pumps and injecting a large quantity of water into the containment.
Spraying the containment would result in extensive damage to safety-related equipment located inside the containment.
There are no valves between QV014 and the RWST to shut off flow during valve disassembly. The valve has been disassembled, inspected and manually full-stroke exercised five times since 1985 by freeze plugging the linejust upstream of the valve. This has been done at refueling outages with the RWST drained to minimum level. In each case the valve was found to be in excellent condition, with no visible signs of degradation. The disassembly and inspection intenn! has been extended based on the hardship imolved in performing a freeze scal; excellent inspection results; low failure rates in the industry for this type valve; and the valve's good location, emironment, and senice conditions.
Alternate Testing: The valve will be disassembled and manually full-stroke exercised once every three refueling outages using the freeze plug method described above. The valve internals will be verified as structurally sound (no loose or corroded parts) and the disk manually exercised to verify full stroke capability.
The disassembled valve will be part stroked with flow after reassembly. Flow indication will be through installed instrumentation, obsened pressure changes, level changes or through the use of ultrasonic (or similar) flow measuring devices.
Additionally, this check valve is partially exercised quarterly during containment spray pump surveillance testing when flow is recirculated to the RWST.
a FNP-2-M-067 RELIEF REQUEST Q2E13-RV-4 (Version 2)
WITHDRAWN (Unit 2 modification of the containment spray system was canceled) l l
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