ML24317A003
| ML24317A003 | |
| Person / Time | |
|---|---|
| Site: | Vogtle  |
| Issue date: | 11/12/2024 |
| From: | John Lamb NRC/NRR/DORL/LPL2-1 |
| To: | Southern Nuclear Operating Co |
| References | |
| EPID L-2024-LRM-0129 | |
| Download: ML24317A003 (1) | |
Text
Planned License Amendment Request Vogtle Electric Generating Plant - Units 3&4 Move Surveillance Requirements from Technical Specifications (TS) 3.3.15 and 3.3.16, Engineered Safety Feature Actuation System (ESFAS) Actuation Logic Presubmittal Meeting: November 18, 2024
Agenda Background Design PMS Logic vs Actuated Component Proposed Technical Specifications (TS) Changes Current TS 3.3.15 & 3.3.16 and Component Surveillance Requirements (SR)
Relocating TS 3.3.15 & 3.3.16 SRs Summary Discussion
Revise TS 3.3.15 / 16 To Move SRs
Background:
Examples of PMS Logic vs Actuated Component 3
Instrument Channels (TS 3.3.8 - 14)
Coincidence Logic (TS 3.3.15/16 a)
Actuation Logic (TS 3.3.15/16 b)
Actuated Component (Non-I&C LCOs)
Revise TS 3.3.15 / 16 To Move SRs Proposed Changes:
Move to Appropriate LCOs TS 3.4.18 (new LCO) for Pressurizer Heater Circuit Breakers TS 3.5.9 (new LCO) for Reactor Coolant Pump Breaker
- TS 3.7.7 (new SR) Startup Feedwater Pump Breaker 3.4.19 (new LCO) for Auxiliary Spray and Purification Line Isolation Valves 3.4.20 (new LCO) for CVS Letdown Isolation Valves 4
Current Surveillances:
TS 3.3.15/16 Surveillances for ESF Logic OPERABILITY SR 3.3.15.1 Verify pressurizer heater circuit breakers trip open SR 3.3.15.2 Verify reactor coolant pump breakers trip open SR 3.3.16.1 Verify reactor coolant pump breakers trip open SR 3.3.15.3 Verify main feedwater and startup feedwater pump breakers trip open SR 3.3.15.4 Verify auxiliary spray and purification line isolation valves actuate to the isolation position SR 3.3.16.2 Verify CVS letdown isolation valves actuate to the isolation position
Revise TS 3.3.15 / 16 To Move SRs Retain Current Applicability and Actions Completion Times Proposed Default Action Changes Align with Preserving the Assumed Safety Function Pressurizer Heater Circuit Breakers (TS 3.4.18)
Retain Action for One Circuit Breaker (i.e., Division) to Restore to OPERABLE status in 6-hours Retain Action for Two Circuit Breakers (i.e., Divisions) & Default Action to Exit the Applicability Include Actions Note Allowing Separate Condition Entry for each Pressurizer Heater Moved SR Adds Exception for Breaker Maintained in the Tripped Condition Reactor Coolant Pump Breakers (TS 3.5.9)
Retain TS 3.3.15 & 3.3.16 Actions to Restore to OPERABLE status in 6 hours6.944444e-5 days <br />0.00167 hours <br />9.920635e-6 weeks <br />2.283e-6 months <br /> and 72 hours8.333333e-4 days <br />0.02 hours <br />1.190476e-4 weeks <br />2.7396e-5 months <br /> (Respectively)
MODES 1, 2, 3, and 4: Retain Two RCP Breakers (i.e., Divisions) & Default Action to Exit the Applicability MODES 5 and 6: Revise Two RCP Breakers (i.e., Divisions) & Default Action to Immediate Trip Affected RCP Breaker(s) (Accomplish the Safety Function)
Include Actions Note Allowing Separate Condition Entry for each RCP Moved SRs Add Exception for Breaker Maintained in the Tripped Condition Main & Startup Feedwater Pump Breaker (TS 3.7.3 & TS 3.7.7)
Retain Action to Restore to OPERABLE in 6-hours Retain Default Action to Exit the Applicability Apply Actions Note Allowing Separate Condition Entry for each Pump Moved SR Adds Exception for Breaker Maintained in the Tripped Condition 5
Revise TS 3.3.15 / 16 To Move SRs Retain Current Applicability and Actions Completion Times Proposed Default Action Changes Align with Preserving the Assumed Safety Function Auxiliary Spray & Purification Line Isolation (TS 3.3.19)
Retain Action For One or Two Valves (i.e., One Division) to Restore to OPERABLE in 6-hours Revise Action for Three Valves (i.e., Two Divisions) & Default Action to Include Option to Isolate the Flow Path (Accomplishes the Assumed Safety Function)
Include Actions Notes (2) to allow flow paths to be unisolated intermittently under administrative control & Separate Condition Entry for each flow path CVS Letdown Isolation Valves (TS 3.4.20)
Retain TS 3.3.16 Action For One Valve to Restore to OPERABLE status in 72-hours Revise Action For Two Valves (i.e., Two Divisions) & Default Action to Initiate Action Immediately to isolate the CVS letdown flow path (Accomplishes the Assumed Safety Function)
Include Actions Notes (2) to allow flow paths to be unisolated intermittently under administrative control & Separate Condition Entry for each flow path 6
Revise TS 3.3.15 / 16 To Move SRs Regulatory Evaluation 10 CFR 50.36(c)(2) - Limiting conditions for operation (LCO):
Each actuated component moved from TS LCO 3.3.15 and TS LCO 3.3.16 are retained within new or existing LCOs.
When any or these new or existing LCOs are not met the TS provide for associated remedial actions until the condition can be met.
10 CFR 50.36(c)(3) - Surveillance requirements (SR):
Existing SRs are retained to continue to assure that the necessary quality of systems and components is maintained, facility operation will be within safety limits, and the limiting conditions for operation will be met.
10 CFR Part 50, Appendix A, General Design Criteria (GDC):
Criterion 20 Protection system functions, Criterion 21 Protection system reliability and testability, and Criterion 22 Protection system independence PMS design and operation is unaffected by the change and continues to initiate automatically the operation of appropriate systems, provide the necessary redundancy and independence, and prevent loss of the protection function under assumed conditions 7
Revise TS 3.3.15 / 16 To Move SRs Summary This Request Is Deterministic - Not Risk Informed Current TS 3.3.15 & TS 3.3.16 for ESF Actuation Logic Contains Surveillance Requirements for Actuated Components Leading to the Potential to Inappropriately Declare ESF Actuation Logic Inoperable Current Surveillance Requirements Retained in New or Other Existing TS with Exceptions Added When Component is Performing the Assumed Safety Function Current Applicability and Actions Completion Times Retrained - Default Actions Appropriate for the Actuated Components Replace the Actuation Logic Default Actions in Some Cases Amendment Would Reduce the Likelihood of an Unnecessary Plant Shutdown, While Retaining Appropriate Requirements to Assure the Assumed Safety Function for Actuated Component Inoperability 8
Revise TS 3.3.15 / 16 To Move SRs Schedule
- Target Transmittal to NRC:
4th Quarter 2024
- SNC Request NRC Issuance of Amendment:
12 Months After NRC Acceptance of LAR Submittal Discussion 9