ML25330A089
| ML25330A089 | |
| Person / Time | |
|---|---|
| Site: | 05000025, 05000026 |
| Issue date: | 12/04/2025 |
| From: | Southern Nuclear Operating Co |
| To: | Division of Operating Reactor Licensing |
| Lamb J, NRR/DORL/LPL2-1 | |
| References | |
| EPID L-202-LRM-0142 | |
| Download: ML25330A089 (0) | |
Text
Vogtle Electric Generating Plant Units 3 & 4 Proposed License Amendment Request Adopt Changes based on TSTF-490, Rev. 0, RCS Specific Activity Pre-submittal Meeting
Agenda Introductions & Meeting Purpose Background Information Applicability of TSTF-490 Variations from TSTF-490 Specific Changes Proposed Schedule / Q&A
Vogtle 3&4 Adoption of changes based on TSTF-490
Introductions
Southern Nuclear Operating Company (SNC)
Nuclear Regulatory Commission (NRC)
Meeting Purpose SNC intends to submit an application to modify the Combined Licenses (COLs) for Vogtle Electric Generating Plant, Units 3 and 4 (Vogtle 3&4). The proposed amendment would revise the Completion Time for Condition B in Technical Specification 3.4.10 from 6 hours6.944444e-5 days <br />0.00167 hours <br />9.920635e-6 weeks <br />2.283e-6 months <br /> to 48 hours5.555556e-4 days <br />0.0133 hours <br />7.936508e-5 weeks <br />1.8264e-5 months <br /> based on TSTF-490, Rev. 0, RCS Specific Activity The purpose of this meeting is to discuss some background information, the licensing approach, the proposed change, contents of the submittal, and a preliminary timeline.
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Vogtle 3&4 Adoption of Changes Based on TSTF-490 Background Information
- The proposed change revises TS 3.4.10 Required Action B from shutdown in 6 hours6.944444e-5 days <br />0.00167 hours <br />9.920635e-6 weeks <br />2.283e-6 months <br /> to restore in 48 hours5.555556e-4 days <br />0.0133 hours <br />7.936508e-5 weeks <br />1.8264e-5 months <br />.
- These changes are based on TSTF-490, Rev. 0 and NUREG-1431, Standard Technical Specifications Westinghouse Plants, Revision 5.0.
Variations to TSTF-490 are described later.
- The new Completion Time provides additional time to correct or evaluate the condition in lieu of a plant shutdown.
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Vogtle 3&4 Adoption of Changes Based on TSTF-490 Applicability of TSTF-490 to AP1000 TSTF-490 was issued prior to issuance of the STS for the AP1000 The proposed change will establish the appropriate requirements for VEGP Units 3&4 that are consistent with current PWR STS as modified by TSTF-490 Since TSTF-490 does not directly address the AP1000 design, the request for VEGP 3&4 is being submitted as a normal LAR 5
Vogtle 3&4 Adoption of changes based on TSTF-490 Changes Based on TSTF-490 The STS changes identified in TSTF-490 have been reviewed for applicability to AP1000 and specifically the Vogtle Units 3 and 4 TS A significant difference between the Completion Time for Required Action B.1 was identified Specifically, the Completion Time in the current Vogtle Units 3 and 4 TS 3.4.10, Required Action B.1, with DOSE EQUIVALENT XE-133 > 280 Ci/gm, is 6 hours6.944444e-5 days <br />0.00167 hours <br />9.920635e-6 weeks <br />2.283e-6 months <br /> to be in MODE 3 with Tavg < 500°F The STS required action for the same condition, based on TSTF-490, is 48 hours5.555556e-4 days <br />0.0133 hours <br />7.936508e-5 weeks <br />1.8264e-5 months <br /> to restore DOSE EQUIVALENT XE-133 to within the allowed limit The 48-hour Completion Time for Required Action B.1, as provided in TSTF-490, is less restrictive and would be beneficial for operation of Vogtle Units 3 and 4 Specifically, this additional time allowed to restore DOSE EQUIVALENT XE-133 to within the allowed limit during transient noble gas spike conditions, could avoid an unnecessary shutdown of the unit 6
Vogtle 3&4 Adoption of changes based on TSTF-490 Discussion of Variations from TSTF-490
- TS 1.1, Definitions already include changes consistent with the TSTF
- TS 3.4.10, RCS Specific Activity
- LCO Description change is not necessary since the LCO requirements are not changed
- Applicability change is not necessary since the current TS acceptable - it is not warranted to change to a more restrictive Applicability
- Condition A and B changes are editorial when removing the Dose Equivalent I-131 and Xe-133 limits which are already in the SRs
- Action B and C changes are limited to those needed to adopt the 48-hour Completion Time for Dose Equivalent XE-131
- SR changes are already included in the VEGP 3&4 TS with the exception of adding NOTE to SR 3.4.10.1
- Action C Required Action and Completion Time changes are not included since Applicability changes are not included as discussed above
- TS Bases 3.4.10, RCS Specific Activity, changes are consistent with the proposed TS changes 7
Vogtle 3&4 Adoption of changes based on TSTF-490 Specific changes proposed:
Revise TS 3.4.10 Required Action B.1, which is for XE-133 greater than the limit of 280 Ci/gm, to state, "Restore DOSE EQUIVALENT XE-133 to within limit" Revise TS 3.4.10 Required Action B.1 Completion Time from 6 hours6.944444e-5 days <br />0.00167 hours <br />9.920635e-6 weeks <br />2.283e-6 months <br /> to 48 hours5.555556e-4 days <br />0.0133 hours <br />7.936508e-5 weeks <br />1.8264e-5 months <br /> A note is added to Required Action B.1 to state that LCO 3.0.4 is not applicable Reference to Condition B is added in Condition C to apply the Required Action and associated Completion Time not met 8
Vogtle 3&4 Adoption of changes based on TSTF-490 9
Vogtle 3&4 Adoption of changes based on TSTF-490 Remaining Actions and Schedule
- Submit LAR to NRC - Q4 2025
- Approval requested - Q3 2026
- Implementation - within 90 days following issuance of the amendment Discussion / Q&A 10