ML18032A331

Presubmittal Meeting Regarding Inverters AOT Slides - February 1, 2018

ML18032A331
Person / Time
Site:	Salem, Hope Creek
Issue date:	02/01/2018
From:	Carleen Parker Plant Licensing Branch 1
To:	Public Service Enterprise Group
Parker C, NRR/DORL/LPLI, 415-1603
References
Download: ML18032A331 (11)

Text

PSEG Pre-Submittal Meeting with NRC, February 1, 2018 Salem and Hope Creek Inverter Allowed Outage Time Extension

PSEG Pre-Submittal Meeting with NRC, February 1, 2018 Meeting Purpose Describe future license amendment requests Establish common understanding of scope of requests Establish a common understanding of schedule Obtain NRC feedback 2

PSEG Pre-Submittal Meeting with NRC, February 1, 2018 Current Licensing Basis Salem

• With one inverter inoperable,

- Energize associated vital instrument bus within 8 hours9.259259e-5 days <br />0.00222 hours <br />1.322751e-5 weeks <br />3.044e-6 months <br />

- Restore inoperable A, B, or C inverter within 24 hours2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br />

- Restore inoperable D inverter within 72 hours8.333333e-4 days <br />0.02 hours <br />1.190476e-4 weeks <br />2.7396e-5 months <br /> Hope Creek

• With one or both inverters in one channel inoperable

- Energize associated 120 volt AC distribution panel(s) within 8 hours9.259259e-5 days <br />0.00222 hours <br />1.322751e-5 weeks <br />3.044e-6 months <br />

- Restore inverter(s) within 24 hours2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br /> 3

PSEG Pre-Submittal Meeting with NRC, February 1, 2018 Proposed Change Salem

• With one inverter inoperable,

- Energize associated vital instrument bus within 8 hours9.259259e-5 days <br />0.00222 hours <br />1.322751e-5 weeks <br />3.044e-6 months <br />

- Restore inverter within 7 days Hope Creek

• With one or both inverters in one channel inoperable

- Energize associated 120 volt AC distribution panel(s) within 8 hours9.259259e-5 days <br />0.00222 hours <br />1.322751e-5 weeks <br />3.044e-6 months <br />

- Restore inverter(s) within 7 days 4

PSEG Pre-Submittal Meeting with NRC, February 1, 2018

Background

Salem

• Four 115 Vac vital instrument buses supplied from individual Uninterruptible Power Supplies (UPS) for each unit

• UPS power sources

- Normal 230 Vac

- Backup 125 Vdc battery

- Alternate 230 Vac (line regulator and static switch)

Norm AC Supply DC Supply Alt AC Supply A 'A' 230V vital A 125V 'A' 230V vital B 'B' 230V vital B 125V B' 230V vital C 'C' 230V vital C 125V C' 230V vital D 'B' 230V vital B 125V B' 230V vital 5

PSEG Pre-Submittal Meeting with NRC, February 1, 2018

Background

Hope Creek

• Four independent Class 1E power system channels

• Two 120 Vac vital instrument buses per channel each supplied by UPS

• UPS power sources

- Normal 480 Vac

- Backup 125 Vdc battery

- Backup 480 Vac (voltage regulator and static switch) 6

PSEG Pre-Submittal Meeting with NRC, February 1, 2018 Need for proposed changes On-line corrective maintenance and post-maintenance testing has challenged current AOTs Proposed AOT extensions

• Allow more rigorous troubleshooting and application of human performance tools for emergent issues

• Can reduce risk associated with shutting down to respond to emergent issues without significant change in at-power risk 7

PSEG Pre-Submittal Meeting with NRC, February 1, 2018 License Amendment Request Scope Traditional Engineering Assessment

• Adequate defense-in-depth maintained

- Each defense-in-depth consideration to be addressed

• Required inverters maintained OPERABLE

• Operator response to LOOP with inverter(s) out of service

• Procedures to start and load EDGs if required

• Safety margins not affected - within current design basis

• Continued monitoring under the M-rule program and PSEG performance and predictive monitoring programs 8

PSEG Pre-Submittal Meeting with NRC, February 1, 2018 License Amendment Request Scope Probabilistic analysis

• Applicable guidance and criteria

- RG 1.174, Rev. 3

- RG 1.200, Rev. 2

- RG 1.177, Rev. 1

• Salem

- Quantitative analyses for internal events and flood

- Qualitative analyses for fire and external events

• Hope Creek

- Quantitative analyses for internal events, fire and internal flood

- Qualitative analyses for external events

• Uncertainty addressed using NUREG-1855, Rev. 1 and supporting EPRI documents 9

PSEG Pre-Submittal Meeting with NRC, February 1, 2018 Precedent Palo Verde Nuclear Generating Station, ML10270352 Clinton Power Station, ML061160181 10

PSEG Pre-Submittal Meeting with NRC, February 1, 2018 Schedule Submit by March 30, 2018 Request review per normal NRC timeline 11