ML22227A130
| ML22227A130 | |
| Person / Time | |
|---|---|
| Site: | Turkey Point  |
| Issue date: | 08/17/2022 |
| From: | Florida Power & Light Co |
| To: | Michael Mahoney NRC/NRR/DORL/LPL2-2 |
| Mahoney, M. | |
| References | |
| EPID L-2022-LRM-0061 | |
| Download: ML22227A130 (7) | |
Text
1 Turkey Point Unit 3 and Unit 4 License Amendment Request Reactor Trip Breaker Completion Time Extension August 17, 2022
2 LAR Purpose Expedited Review Basis 3B RTB proposed maintenance Operability, System Capability Defense in Depth and Diversity LAR Strategies Considered Risk Informed Process for Evaluations One-Time CT Extension Risk Informed Completion Time Questions and Comments Non-proprietary information suitable for public disclosure Agenda
3 Purpose Non-proprietary information suitable for public disclosure Current Completion Time Tech Spec 3.3.1, Table 3.3-1, Functional Unit (FU) 19, RTBs Total No. of Channels = 2 Channels to Trip = 1 Minimum channels OPERABLE = 2 ACTION 8 for MODES 1 thru 4 For one channel less than Minimum Channels Operable requirement, be in HOT STANDBY within 6 hours6.944444e-5 days <br />0.00167 hours <br />9.920635e-6 weeks <br />2.283e-6 months <br />.
One channel may be bypassed up to 2 hours2.314815e-5 days <br />5.555556e-4 hours <br />3.306878e-6 weeks <br />7.61e-7 months <br /> for SR testing provided the other channel is OPERABLE.
Completion Time Extension Proposed ACTION 8 for MODES 1 thru 4 For one channel less than Minimum Channels Operable requirement, be in HOT STANDBY within 24 hours2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br />.
One channel may be bypassed up to 2 hours2.314815e-5 days <br />5.555556e-4 hours <br />3.306878e-6 weeks <br />7.61e-7 months <br /> for SR testing provided the other channel is OPERABLE.
Precedent Surry (ML19143A201)
Virgil C. Summer (ML17206A412)
4 Expedited Review Request Non-proprietary information suitable for public disclosure 3B RTB Issue One of two switches falsely indicating 3B RTB OPEN False input to Feedwater Isolation logic circuitry Proposed Maintenance Replace 3B RTB and temporarily bypass cell switch with Unit 3 online; 3B RTB OOS ~7 hours Maintenance Schedule
- 3B RTB corrective maintenance scheduled October 24, 2022 4
Operability / Safety Function 3B RTB is currently OPERABLE During maintenance, RTB and RPS systems remain fully capable Defense in Depth and Diversity Bypass RTBs Undervoltage or Shunt Coil AMSAC
5 LAR Strategies Considered Non-proprietary information suitable for public disclosure Options One-Time Completion Time Extension Risk Informed Process for Evaluations (RIPE)
Risk Informed Completion Time Extension (RICT)
Considerations Near term need date Very low PRA Risk (both delta CDF and LERF)
6 LAR Strategies Considered Non-proprietary information suitable for public disclosure Risk Informed Process for Evaluations (RIPE)
TSG-DORL-2021-01, Revision 2 Approved TSTF-505 and TSTF-425 programs Integrated Decision-Making process per TSG guidelines No immediate actions for safe operation or continued power production 3B RTB is modeled in PRA Meets RG 1.174 minimal risk significance guidelines (CDF and LERF)
One-Time Completion Time Extension
- Would only result in one-time use
- Additional NRC reviews Risk Informed Completion Time Extension (RICT)
Would result in greatest flexibility Likely would not be processed in time for planned use Additional NRC reviews
7 Questions?
Non-proprietary information suitable for public disclosure