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| | number = ML112450479 | | | number = ML112450479 |
| | issue date = 09/02/2011 | | | issue date = 09/02/2011 |
| | title = Nine Mile Point, Unit No. 2 - E-mail from J.Dosa to R.Guzman NMP2 EPU SLC Piping/Component Rerating Modification | | | title = E-mail from J.Dosa to R.Guzman NMP2 EPU SLC Piping/Component Rerating Modification |
| | author name = Dosa J J | | | author name = Dosa J |
| | author affiliation = Constellation Energy Nuclear Group, LLC, Nine Mile Point Nuclear Station, LLC | | | author affiliation = Constellation Energy Nuclear Group, LLC, Nine Mile Point Nuclear Station, LLC |
| | addressee name = Guzman R V | | | addressee name = Guzman R |
| | addressee affiliation = NRC/NRR/DORL | | | addressee affiliation = NRC/NRR/DORL |
| | docket = 05000410 | | | docket = 05000410 |
| | license number = NPF-069 | | | license number = NPF-069 |
| | contact person = Guzman R V, NRR/DORL, 415-1030 | | | contact person = Guzman R, NRR/DORL, 415-1030 |
| | case reference number = TAC ME1476 | | | case reference number = TAC ME1476 |
| | document type = E-Mail | | | document type = E-Mail |
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| =Text= | | =Text= |
| {{#Wiki_filter:From: Dosa, John J [John.Dosa@cengllc.com] Sent: Friday, September 02, 2011 3:56 PM To: Guzman, Richard Cc: Darling, Theresa H | | {{#Wiki_filter:From: Dosa, John J [John.Dosa@cengllc.com] |
| | Sent: Friday, September 02, 2011 3:56 PM To: Guzman, Richard Cc: Darling, Theresa H |
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| ==Subject:== | | ==Subject:== |
| RE: Quick Question - SLC piping/component rerating modification This was completed as stated. If there was a SAR change associated, it would have been discussed in the Fall 2010 50.59 report associated with the SAR update. I will need to review that document. | | RE: Quick Question - SLC piping/component rerating modification This was completed as stated. If there was a SAR change associated, it would have been discussed in the Fall 2010 50.59 report associated with the SAR update. I will need to review that document. |
| From: Guzman, Richard [mailto:Richard.Guzman@nrc.gov] | | From: Guzman, Richard [mailto:Richard.Guzman@nrc.gov] |
| Sent: Friday, September 02, 2011 3:47 PM To: Dosa, John J Cc: Darling, Theresa H | | Sent: Friday, September 02, 2011 3:47 PM To: Dosa, John J Cc: Darling, Theresa H |
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| ==Subject:== | | ==Subject:== |
| Quick Question - SLC piping/component rerating modification John - as we discussed, can you verify that the modification described below was indeed completed during the Spring 2010 outage? Is there a docketed document out there from NMPNS that states this. See below. | | Quick Question - SLC piping/component rerating modification John - as we discussed, can you verify that the modification described below was indeed completed during the Spring 2010 outage? Is there a docketed document out there from NMPNS that states this. See below. |
| | |
| NMPNS 2/19/11 RAI Response The SLCS pump relief valve setpoint maintains a 31.6 psi margin to relief valve lift, in addition to the 3% set pressure tolerance (42 psi). Therefore, the combined margin is 73.6 psi. | | NMPNS 2/19/11 RAI Response The SLCS pump relief valve setpoint maintains a 31.6 psi margin to relief valve lift, in addition to the 3% set pressure tolerance (42 psi). Therefore, the combined margin is 73.6 psi. |
| The overall combined accuracy of the test instrument is not accounted in the margin calculation. However, the instrument used for the set pressure determination meets the ASME OM CODE-2004, which is adopted in the NMP2 IST program. The gauge accuracy used in the set pressure determination is +/-0.5% compared to the code requirement of +/-1%. | | The overall combined accuracy of the test instrument is not accounted in the margin calculation. However, the instrument used for the set pressure determination meets the ASME OM CODE-2004, which is adopted in the NMP2 IST program. The gauge accuracy used in the set pressure determination is +/-0.5% compared to the code requirement of +/-1%. |
| The combined margin of 73.6 psi is recognized to provide minimally sufficient margin for SLCS pump relief valves, at both CLTP and EPU conditions. As such, the piping design pressure is being rerated and the relief valve set pressure increased to provide additional margin. | | The combined margin of 73.6 psi is recognized to provide minimally sufficient margin for SLCS pump relief valves, at both CLTP and EPU conditions. As such, the piping design pressure is being rerated and the relief valve set pressure increased to provide additional margin. |
| The margin of 73.6 psi was defined based on nominal relief valve setpoint of 1400 psi minus the pump discharge pressure of 1326.4 psi. This margin is 1 psi less than the existing margin that has been demonstrated effective at eliminating relief valve lift during surveillance testing. However, for the current operating condition the 75 psi margin to SLCS relief valve nominal setpoint has not prevented relief valve seat seepage during SLCS pump surveillance testing. To resolve this issue the SLCS relief valve vendor has recommended maintaining approximately a 10% margin between the maximum SLCS pump pressure pulsation and the nominal relief valve setpoint. To achieve this margin the SLCS piping and components are being rerated to 1600 psig. The setpoint for the relief valve will be established to include at least a 10% margin between the maximum SLCS pump peak pressure pulsation and the relief valve minimum setpoint, (1459 psi) or approximately a 133 psi margin. The rerating of the piping to 1600 psig will provide the ability to increase the relief setting to a maximum of 1600 psi providing approximately a 20% margin above the pump discharge pressure of 1326.4 psi. This modification is currently planned for implementation during the spring 2010 refueling outage. | | The margin of 73.6 psi was defined based on nominal relief valve setpoint of 1400 psi minus the pump discharge pressure of 1326.4 psi. This margin is 1 psi less than the existing margin that has been demonstrated effective at eliminating relief valve lift during surveillance testing. |
| | However, for the current operating condition the 75 psi margin to SLCS relief valve nominal setpoint has not prevented relief valve seat seepage during SLCS pump surveillance testing. To resolve this issue the SLCS relief valve vendor has recommended maintaining approximately a 10% margin between the maximum SLCS pump pressure pulsation and the nominal relief valve setpoint. To achieve this margin the SLCS piping and components are being rerated to 1600 psig. The setpoint for the relief valve will be established to include at least a 10% margin between the maximum SLCS pump peak pressure pulsation and the relief valve minimum setpoint, (1459 psi) or approximately a 133 psi margin. The rerating of the piping to 1600 psig will provide the ability to increase the relief setting to a maximum of 1600 psi providing approximately a 20% |
| | margin above the pump discharge pressure of 1326.4 psi. This modification is currently planned for implementation during the spring 2010 refueling outage. |
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| >>> This e-mail and any attachments are confidential, may contain legal, professional or other privileged information, and are intended solely for the addressee. If you are not the intended recipient, do not use the information in this e-mail in any way, delete this e-mail and notify the sender. CEG-IP1}} | | >>> This e-mail and any attachments are confidential, may contain legal, professional or other privileged information, and are intended solely for the addressee. If you are not the intended recipient, do not use the information in this e-mail in any way, delete this e-mail and notify the sender. CEG-IP1}} |
Letter Sequence Other |
|---|
TAC:ME1476, Clarify Application of Setpoint Methodology for LSSS Functions (Approved, Closed) |
Administration
- Withholding Request Acceptance, Withholding Request Acceptance, Withholding Request Acceptance, Withholding Request Acceptance, Withholding Request Acceptance, Withholding Request Acceptance, Withholding Request Acceptance, Withholding Request Acceptance, Withholding Request Acceptance, Withholding Request Acceptance, Withholding Request Acceptance, Withholding Request Acceptance, Withholding Request Acceptance, Withholding Request Acceptance, Withholding Request Acceptance
- Meeting
Results
Other: ML092460553, ML092460595, ML092460596, ML100190073, ML100190074, ML100190075, ML100190076, ML100190077, ML101300006, ML101900448, ML101900449, ML101900450, ML101950497, ML101950498, ML103050187, ML110460160, ML110880302, ML11171A060, ML111920326, ML111950133, ML112031112, ML112081701, ML112160736, ML11221A013, ML112450479, ML112460008, ML112460009, ML113340186, ML120050150, ML120250137, ML12313A203, ML12313A204, ML12313A206, NRC-2010-0117, Final Environmental Assessment and Finding of No Significant Impact - Federal Register Notice - Related to the Proposed License Amendment to Increase the Maximum Reactor Power Level
|
MONTHYEARML1001900772004-03-31031 March 2004
GE-NE-0000-0024-6517-R0, Safer/Gestr Loss-of-Coolant Accident Analysis for GE14 Fuel.
Project stage: Other
ML0916101032009-05-27027 May 2009
License Amendment Request (LAR) Pursuant to 10 CFR 50.90: Extended Power Uprate
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ML0918906662009-07-0808 July 2009
E-mail from R. Guzman to J. Dosa Acceptance Review Results of NMP2 Extended Power Uprate Application
Project stage: Acceptance Review
ML0919402542009-07-15015 July 2009
Acceptance Review of License Amendment Request Extended Power Uprate
Project stage: Acceptance Review
ML0924605502009-08-28028 August 2009
Response to Acceptance Review Comments License Amendment Request for Extended Power Uprate
Project stage: Request
ML0924605962009-08-28028 August 2009
Attachment 2 - CDI Report 09-26NP, Revision 0, (Non-Proprietary) Stress Assessment of Nine Mile Point, Unit 2 Steam Dryer at CLTP and EPU Conditions, Part 2 of 2
Project stage: Other
ML0924605952009-08-28028 August 2009
Attachment 2 - CDI Report 09-26NP, Revision 0, (Non-Proprietary) Stress Assessment of Nine Mile Point, Unit 2 Steam Dryer at CLTP and EPU Conditions, Part 1 of 2
Project stage: Other
ML0924605532009-08-28028 August 2009
Attachment 3 - CDI Report 08-08NP, Revision 2, (Non-Proprietary) Acoustic and Low Frequency Hydrodynamic Loads at CLTP Power Level on Nine Mile Point, Unit 2 Steam Dryer to 250 Hz
Project stage: Other
ML0924502742009-09-0202 September 2009
Acceptance Review Determination of Amendment Request and Supplemental Information Extended Power Uprate
Project stage: Acceptance Review
ML1019704202009-09-18018 September 2009
E-mail from R. Guzman to J. Dosa Request for Additional Information - Clarification of Applicability of GEH Methods
Project stage: RAI
ML0928100032009-10-0808 October 2009
Request for Additional Information Nine Mile Point Unit 2 (NMP2) Extended Power Uprate Application License Amendment Request
Project stage: RAI
ML0930800012009-11-13013 November 2009
Request for Additional Information Extended Power Uprate
Project stage: RAI
ML0931900032009-11-18018 November 2009
Request for Additional Information the License Amendment Request for Extended Power Uprate
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ML0934300032009-12-10010 December 2009
Request for Withholding Information from Public Disclosure - Proposed License Amendment for Extended Power Uprate Operation, Supplement Dated August 28, 2009 C.D.I Proprietary Documents - Nine Mile Point Nuclear Station Unit No. 2
Project stage: Withholding Request Acceptance
ML0932706132009-12-10010 December 2009
Request for Withholding Information from Public Disclosure - Proposed License Amendment for Extended Power Uprate Operation Dated May 27, 2009 C.D.I Proprietary Documents - Nine Mile Point Nuclear Station Unit No. 2
Project stage: Withholding Request Acceptance
ML0934106852009-12-10010 December 2009
Request for Withholding Information from Public Disclosure - Proposed License Amendment for Extended Power Uprate Operation Dated May 27, 2009 GEH Proprietary Documents - Nine Mile Point Nuclear Station Unit No. 2
Project stage: Withholding Request Acceptance
ML0935110252009-12-23023 December 2009
Request for Additional Information Extended Power Uprate License Amendment Request
Project stage: RAI
ML1001900722009-12-23023 December 2009
Response to Request for Additional Information, Regarding License Amendment Request for Extended Power Uprate Operation
Project stage: Response to RAI
ML1001900732009-12-31031 December 2009
C.D.I. Technical Note No. 09-17NP, Limit Curve Analysis with ACM Rev. 4 for Power Ascension at Nine Mile Point, Unit 2, Revision 0
Project stage: Other
ML1001900742009-12-31031 December 2009
C.D.I. Report No. 08-08NP, Acoustic and Low Frequency Hydrodynamic Loads at CLTP Power Level on Nine Mile Point Unit 2 Steam Dryer to 250 Hz, Revision 3
Project stage: Other
ML1001900752009-12-31031 December 2009
CDI Report No. 09-26NP, Stress Assessment of Nine Mile Point, Unit 2 Steam Dryer at CLTP and EPU Conditions, Cover to Page 62, Revision 1
Project stage: Other
ML1001900762009-12-31031 December 2009
CDI Report No. 09-26NP, Stress Assessment of Nine Mile Point, Unit 2 Steam Dryer at CLTP and EPU Conditions, Page 63 Through 130, Revision 1
Project stage: Other
ML1019704362010-01-12012 January 2010
E-mail from R. Guzman to T. Darling Request for Additional Information - Extended Power Uprate LAR Standby Liquid Control System
Project stage: RAI
ML1019704452010-01-27027 January 2010
E-mail from R. Guzman to T. Darling Request for Additional Information Extended Power Uprate - Clarification for Piping NDE Review
Project stage: RAI
ML1019704532010-02-0101 February 2010
E-mail from R. Guzman to T. Darling Request for Additional Information Extended Power Uprate LAR - Clarification in Fire Protection Review RAI D1, D3
Project stage: RAI
ML1005505992010-02-19019 February 2010
Response to Request for Additional Information Regarding License Amendment Request for Extended Power Uprate Operation
Project stage: Response to RAI
ML1006301122010-03-10010 March 2010
Request for Additional Information - Extended Power Uprate License Amendment Request Mechanical & Civil Engineering Review
Project stage: RAI
ML1006902762010-03-10010 March 2010
E-mail from R.Guzman to T.Darling Request for Additional Information - Containment & Ventilation Branch - Extended Power Uprate
Project stage: RAI
ML1006301082010-03-10010 March 2010
Request for Additional Information Steam Dryer Review of the License Amendment Request for Extended Power Uprate Operation
Project stage: RAI
ML1005508412010-03-16016 March 2010
Letter Transmitting the Draft Environmental Assessment for Nine Mile Point Nuclear Station Extended Power Uprate for Unit No. 2
Project stage: Draft Other
ML1006804292010-04-0202 April 2010
Request for Withholding Information from Public Disclosure - Proposed License Amendment for Extended Power Uprate Operation, Supplement Dated December 23, 2009 GEH Proprietary Documents - Nine Mile Point Nuclear Station Unit No. 2
Project stage: Withholding Request Acceptance
ML1006804412010-04-0202 April 2010
Request for Withholding Information from Public Disclosure - Proposed License Amendment for Extended Power Uprate Operation, Supplement December 23,2 009 C.D.I Proprietary Documents - Nine Mile Point Nuclear Station Unit No. 2
Project stage: Withholding Request Acceptance
ML1006804482010-04-0202 April 2010
Request for Withholding Information from Public Disclosure - Proposed License Amendment for Extended Power Uprate Operation, Supplement February 19, 2010 GEH Proprietary Documents - Nine Mile Point Nuclear Station Unit No. 2
Project stage: Withholding Request Acceptance
ML1008500412010-04-0202 April 2010
Summary of Audit Related to the Review of the Extended Power Uprate License Amendment Request of Nine Mile Point Nuclear Station, Unit No. 2
Project stage: Approval
ML1008500512010-04-0202 April 2010
Correction Notice to Draft Environmental Assessment for Nine Mile Point Nuclear Station Proposed Extended Power Uprate Amendment for Unit No. 2
Project stage: Draft Other
ML1008501072010-04-0202 April 2010
Letter Transmitting Correction to the Notice for the Draft Environmental Assessment and Finding of No Significant Impact for Nine Mile Point Nuclear Station, Unit No. 2
Project stage: Draft Other
ML1013000062010-04-14014 April 2010
Follow-Up Questions - EPU Vessels and Integrity Review
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ML1011206582010-04-16016 April 2010
Response to Request for Additional Information Re License Amendment Request for Extended Power Uprate Operation
Project stage: Response to RAI
ML1013803072010-05-0707 May 2010
Response to Request for Additional Information Regarding Steam Dryer Review of the License Amendment Request for Extended Power Uprate Operation
Project stage: Response to RAI
ML1013200242010-05-10010 May 2010
E-mail from R. Guzman to T. Darling/J. Dosa Request for Additional Information - LOCA Analysis, Extended Power Uprate
Project stage: RAI
ML1012504242010-05-11011 May 2010
Request for Additional Information Extended Power Uprate License Amendment Request - Reactor System Review
Project stage: RAI
ML1016101682010-06-0303 June 2010
Response to Request for Additional Information Regarding the License Amendment Request for Extended Power Uprate Operation- Reactor Systems Review
Project stage: Response to RAI
ML1015908092010-06-0808 June 2010
Request for Additional Information Extended Power Uprate - Probabilistic Risk Assessment Review
Project stage: RAI
ML1015906522010-06-10010 June 2010
Review of Extended Power Uprate Application and Revised Review Schedule
Project stage: Approval
ML1019604812010-06-15015 June 2010
E-mail from R.Guzman to T.Darling Request for Additional Information Follow-up RAI - Reactor Systems/Criticality Analysis
Project stage: RAI
ML1019004492010-06-30030 June 2010
C.D.I. Report No. 10-10NP, Acoustic and Low Frequency Hydrodynamic Loads at CLTP Power Level on Nine Mile Point Unit 2 Steam Dryer to 250 Hz Using ACM Rev. 4.1, Rev. 1
Project stage: Other
ML1019004502010-06-30030 June 2010
Calculation SIA 100632.301, Revision 0, May 2010 Nine Mile Point Unit 2 Main Steam Line Strain Gage Data Reduction.
Project stage: Other
ML1019004482010-06-30030 June 2010
C.D.I. Report No. 10-09NP, ACM Rev. 4.1: Methodology to Predict Full Scale Steam Dryer Loads from In-Plant Measurements, Rev. 1 (Non-Proprietary)
Project stage: Other
ML1019004472010-06-30030 June 2010
Response to Request for Additional Information Regarding the License Amendment Request for Extended Power Uprate Operation - Steam Dryer and Probabilistic Risk Assessment
Project stage: Response to RAI
ML1019504952010-07-0909 July 2010
Response to Request for Additional Information Regarding the License Amendment Request for Extended Power Uprate Operation, Non-Proprietary Version of Continuum Dynamics, Inc. Report 10-11
Project stage: Response to RAI
2010-02-01
[Table View] |
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Category:E-Mail
MONTHYEARML24312A1662024-11-0707 November 2024
Request for Additional Information (11/7/2024 E-mail) - LAR to Revise TSs to Adopt TSTF-230, Revision 1, Add New Condition B to LCO 3.6.2.3
ML24250A1062024-09-0606 September 2024
NRR E-mail Capture - Final RAI - Constellation Energy Generation, LLC - Fleet Request - Proposed Alternative to Utilize Code Case OMN-32 (L-2024-LLR-0030)
ML24249A1362024-09-0404 September 2024
EN 57304 - Westinghouse Electric Company, LLC, Final Report - No Embedded Files. Notification of the Potential Existence of Defects Pursuant to 10 CFR Part 21
ML24234A2772024-08-21021 August 2024
NRR E-mail Capture - Final RAI - Constellation Energy, LLC - Fleet Request - Proposed Alternative Concerning Extension of Permanent Relief from Ultrasonic Examination of Reactor Pressure Vessel Circumferential Shell Welds (L-2024-LLR-0031)
ML24240A1902024-08-12012 August 2024
E-mail (8/12/2024) from R. Reynolds (CEG) to R. Guzman (NRC) - Corrected TS Pages for LAR TS Design Features Section to Remove the Nine Mile Point Unit 3 Nuclear Project, LLC
ML24213A2202024-07-31031 July 2024
Updated Change in Estimated Review Schedule Revision to TS Design Features Section to Remove the Nine Mile Point Unit 3 Nuclear Project, LLC
ML24197A0092024-07-15015 July 2024
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ML24197A0162024-07-12012 July 2024
NRR E-mail Capture - Final RAI - Constellation Energy Generation, LLC - Fleet Request - License Amendment Request to Adopt TSTF-591
ML24156A0082024-05-31031 May 2024
NRR E-mail Capture - Constellation Energy, LLC - Fleet Request - Acceptance of Proposed Alternative Concerning Extension of Permanent Relief from Ultrasonic Examination of Reactor Pressure Vessel Circumferential Shell Welds (L-2024-LLR-0031
ML24131A0612024-05-10010 May 2024
NRR E-mail Capture - Constellation Energy Generation, LLC - Fleet Request - Acceptance of Proposed Alternative to Utilize Code Case OMN-32 (L-2024-LLR-0030)
ML24122B5072024-05-0101 May 2024
NRR E-mail Capture - Constellation Energy Generation, LLC - Fleet Request - Acceptance of License Amendment Request to Adopt TSTF-591, Revision 0
ML24008A0592024-01-0808 January 2024
E-mail Dated 1-8-2024 from R. Guzman to R. Reynolds Correct TS Page 204 for License Amendment No. 250 Adoption of TSTF-505
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Acceptance Review Determination for Relief Request I5R-12, Concerning Installation of a FSWOL on RPV Recirculation Inlet Nozzle N2E Safe End-to-Nozzle Dissimilar Metal Weld
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NRR E-mail Capture - Constellation Energy Generation, LLC - Fleet Request - Acceptance of License Amendment Request to Adopt TSTF-264-A, Revision 0
ML23264A7992023-09-21021 September 2023
NRR E-mail Capture - Final RAI - Constellation Energy Generation, LLC – Fleet Request – License Amendment Request to Adopt TSTF-580, Revision 1
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NRR E-mail Capture - Constellation Energy Generation, LLC - Fleet Request - Acceptance of Alternative to Use the Successive Inspection Requirements of BWRVIP-75-A
ML23237B3972023-08-24024 August 2023
NRR E-mail Capture - Constellation Energy Generation, LLC - Fleet Request - Acceptance of Alternative Request to Use Updated BWRVIP Guidelines
ML23205A2432023-07-19019 July 2023
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ML23207A0762023-07-14014 July 2023
EN 56557 - Update to Part 21 Report Re Potential Defect with Trane External Auto/Stop Emergency Stop Relay Card Pn: XI2650728-06
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ML23205A2422023-07-11011 July 2023
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ML23209A7692023-06-14014 June 2023
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NRR E-mail Capture - Constellation Energy Generation, LLC - Fleet Request - Acceptance of License Amendment Request to Adopt TSTF-580, Revision 1
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56557-EN 56557 - Paragon - Redlined
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Acceptance Review Determination License Amendment Requets to Adopt TSTF-505
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Acceptance Review Determination Proposed Alternative for Weld Overlay Repair to the Torus
ML22354A2622022-12-20020 December 2022
NRR E-mail Capture - Constellation Energy Generation, LLC - Fleet Request - Acceptance of Request to Use Certain Provisions of the 2019 Edition of the ASME BPV Code, Section XI
ML22342B1462022-11-21021 November 2022
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(E-mail Dated 7/26/2022) Setup of Online Reference Portal for Revision to Alternative Source Term Calculation for MSIV and Non-MSIV Leakage
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Acceptance Review Determination Revision to Alternative Source Term Analysis for Containment Leakage
ML22200A0782022-07-19019 July 2022
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Acceptance Review Determination - Relief Request CS-PR-02 Associated with Pump Periodic Verification Test of Core Spray System Pumps, E-mail Dated 3/16/2022
ML22041B5362022-02-10010 February 2022
NRR E-mail Capture - Constellation Energy Generation, LLC - Request for Additional Information Regarding Fleet License Amendment Request to Adopt TSTF-541
2024-09-06
[Table view] |
Text
From: Dosa, John J [John.Dosa@cengllc.com]
Sent: Friday, September 02, 2011 3:56 PM To: Guzman, Richard Cc: Darling, Theresa H
Subject:
RE: Quick Question - SLC piping/component rerating modification This was completed as stated. If there was a SAR change associated, it would have been discussed in the Fall 2010 50.59 report associated with the SAR update. I will need to review that document.
From: Guzman, Richard [1]
Sent: Friday, September 02, 2011 3:47 PM To: Dosa, John J Cc: Darling, Theresa H
Subject:
Quick Question - SLC piping/component rerating modification John - as we discussed, can you verify that the modification described below was indeed completed during the Spring 2010 outage? Is there a docketed document out there from NMPNS that states this. See below.
NMPNS 2/19/11 RAI Response The SLCS pump relief valve setpoint maintains a 31.6 psi margin to relief valve lift, in addition to the 3% set pressure tolerance (42 psi). Therefore, the combined margin is 73.6 psi.
The overall combined accuracy of the test instrument is not accounted in the margin calculation. However, the instrument used for the set pressure determination meets the ASME OM CODE-2004, which is adopted in the NMP2 IST program. The gauge accuracy used in the set pressure determination is +/-0.5% compared to the code requirement of +/-1%.
The combined margin of 73.6 psi is recognized to provide minimally sufficient margin for SLCS pump relief valves, at both CLTP and EPU conditions. As such, the piping design pressure is being rerated and the relief valve set pressure increased to provide additional margin.
The margin of 73.6 psi was defined based on nominal relief valve setpoint of 1400 psi minus the pump discharge pressure of 1326.4 psi. This margin is 1 psi less than the existing margin that has been demonstrated effective at eliminating relief valve lift during surveillance testing.
However, for the current operating condition the 75 psi margin to SLCS relief valve nominal setpoint has not prevented relief valve seat seepage during SLCS pump surveillance testing. To resolve this issue the SLCS relief valve vendor has recommended maintaining approximately a 10% margin between the maximum SLCS pump pressure pulsation and the nominal relief valve setpoint. To achieve this margin the SLCS piping and components are being rerated to 1600 psig. The setpoint for the relief valve will be established to include at least a 10% margin between the maximum SLCS pump peak pressure pulsation and the relief valve minimum setpoint, (1459 psi) or approximately a 133 psi margin. The rerating of the piping to 1600 psig will provide the ability to increase the relief setting to a maximum of 1600 psi providing approximately a 20%
margin above the pump discharge pressure of 1326.4 psi. This modification is currently planned for implementation during the spring 2010 refueling outage.
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