ML26033A492
| ML26033A492 | |
| Person / Time | |
|---|---|
| Site: | Calvert Cliffs  |
| Issue date: | 02/02/2026 |
| From: | Para W Constellation Energy Generation |
| To: | Office of Nuclear Reactor Regulation, Document Control Desk |
| References | |
| Download: ML26033A492 (0) | |
Text
200 Energy Way Kennett Square, PA 19348 www.constellation.com 10 CFR 50.90 February 2, 2025 U.S. Nuclear Regulatory Commission ATTN: Document Control Desk Washington, DC 20555-0001 Calvert Cliffs Nuclear Power Plant, Unit 2 Renewed Facility Operating License No. DPR-69 NRC Docket No. 50-318
SUBJECT:
Supplement to License Amendment Request - Proposed Change to Technical Specification 3.8.1 Action D.3 to Extend the Offsite Circuit Inoperable Completion Time on a One-Time Basis
REFERENCE:
Letter from W. Para (Constellation) to U.S. Nuclear Regulatory Commission, License Amendment Request - Proposed Change to Technical Specification 3.8.1 Action D.3 to Extend the Offsite Circuit Inoperable Completion Time on a One-Time Basis, dated October 2, 2025 (ADAMS Accession No. ML25275A565)
In the referenced letter, Constellation Energy Generation, LLC (CEG) requested a change to the Technical Specifications (TS) of Renewed Facility Operating License No. DPR-69 for Calvert Cliffs Nuclear Power Plant (CCNPP), Unit 2. The proposed change is a one-time use extension to TS 3.8.1, AC Sources-Operating, Action D.3 Completion Time (CT) for an inoperable offsite circuit from 72 hours8.333333e-4 days <br />0.02 hours <br />1.190476e-4 weeks <br />2.7396e-5 months <br /> to 14 days in order to allow for electrical system hardening modifications and return to service testing of the 13.8 kV Service Bus 11 during the 2026 Unit 1 Refueling Outage. The modifications and associated bus outage cannot be accomplished within the CT of 72 hours8.333333e-4 days <br />0.02 hours <br />1.190476e-4 weeks <br />2.7396e-5 months <br />.
This supplement revises some of the compensatory measures in Section 3.4 of the referenced letter due to changes to the CCNPP 2026 Unit 1 Refueling Outage plan.
to this letter contains supplemental information to the referenced letter request describing the changes to compensatory measures and the impact of those changes. provides an updated listing of compensatory measures for affected sections.
Attachments 3 and 4 provide an updated markup of the affected TS page and the associated clean page, respectively. The updated TS page adds a reference to this supplement to document the updated compensatory measures.
CEG has reviewed the information supporting a finding of no significant hazards consideration and the environmental consideration provided to the NRC in the referenced
Supplement to License Amendment Request Proposed Change to Technical Specification 3.8.1 Action D.3 Docket No. 50-318 February 2, 2026 Page 2 letter. The information attached to this letter does not affect the bases for concluding that the proposed license amendment does not involve a significant hazards consideration.
Furthermore, the information attached to this letter does not affect the bases for concluding that neither an environmental impact statement nor an environmental assessment needs to be prepared in connection with the proposed amendment.
There are no regulatory commitments contained in this submittal.
Should you have any questions concerning this submittal, please contact Adam Donell at (267) 533-5156.
I declare under penalty of perjury that the foregoing is true and correct. Executed on the 2nd day of February 2026.
Respectfully, Wendi Para Sr. Manager - Licensing Constellation Energy Generation, LLC Attachments:
- 1.
License Amendment Request Supplemental Information
- 2.
Updated Compensatory Measures
- 3.
Updated Proposed Technical Specification Change (Markup)
- 4.
Updated Proposed Technical Specification Change (Clean) cc:
USNRC Region I, Regional Administrator USNRC Senior Resident Inspector - Calvert Cliffs Nuclear Power Plant USNRC Project Manager, NRR - Calvert Cliffs Nuclear Power Plant Para, Wendi E 2026.02.02 17:13:31 -05'00'
ATTACHMENT 1 Supplement to License Amendment Request Calvert Cliffs Nuclear Power Plant, Unit 2 Renewed Facility Operating License No. DPR-69 NRC Docket No. 50-318 License Amendment Request Supplemental Information
Supplement to License Amendment Request Proposed Change to Technical Specification 3.8.1 Action D.3 Page 1 of 2 By letter October 2, 2025 (Reference, ML25275A565), Constellation Energy Generation, LLC (CEG), requested a change to the Technical Specifications (TS) of Renewed Facility Operating License No. DPR-69 for Calvert Cliffs Nuclear Power Plant (CCNPP), Unit 2. The proposed change is a one-time use extension to TS 3.8.1, AC Sources-Operating, Action D.3 Completion Time (CT) for an inoperable offsite circuit from 72 hours8.333333e-4 days <br />0.02 hours <br />1.190476e-4 weeks <br />2.7396e-5 months <br /> to 14 days in order to allow for electrical system hardening modifications and return to service testing of the 13.8 kV Service Bus 11 during the 2026 Unit 1 Refueling Outage. The modifications and associated bus outage cannot be accomplished within the CT of 72 hours8.333333e-4 days <br />0.02 hours <br />1.190476e-4 weeks <br />2.7396e-5 months <br />.
Refer to Reference Attachment 3, Updated Final Safety Analysis (UFSAR) Fig. No. 8-1, which is the Electrical Main Single Line Diagram for CCNPP, to facilitate the following discussion.
At the time the Reference was transmitted, 4.16 kV ESF Bus 11 was planned to be removed from service for part of the extended CT period. Additional compensatory measures were specified as only applicable during the 4.16 kV ESF Bus 11 out of service period. The current outage plan does not include the removal of 4.16 kV ESF Bus 11. Therefore, compensatory measures that were required only during the 4.16 kV ESF Bus 11 out of service period have been removed from the updated compensatory measures as reflected in Attachment 2 of this submittal.
At the time the Reference was transmitted, 500 kV breakers 552-21, 552-22, 552-23, and 552-43 (and control room hand switches) were planned to be protected during the extended CT period. The current outage plan includes a period where equipment in the 500 kV system is removed from service to support required maintenance. Breakers 552-21, 552-22, 552-23, and 552-43 will be removed from service during this maintenance period. This maintenance is necessary to ensure the continued reliability of the 500 kV system.
The updated outage protection scheme includes the additional protection of 500 kV breakers 552-11, 552-13, 552-61, and 552-63 (and control room hand switches), as well as the P-13000-3 service transformer. With the updated protection scheme, there will be protected offsite sources through the Red Bus to both the P-13000-2 and P-13000-3 service transformers. This protection scheme provides redundant 13.8 kV transformers supporting 13.8 kV Bus 21. These changes to 500 kV system protection are included in the updated protected equipment listing in of this submittal.
Additional changes were also made to the Reference protected equipment listing and associated note. Areas in the 500 kV switchyard control house are now specified since there are portions of the control house that do not require protection. The 4.16 kV ESF Buses 11, 21, and 24 buses are now explicitly called out as sub-items in the list of protected equipment. The 13.8 kV Bus 21 metal clad enclosure sub-item was corrected to specify Unit 2 instead of Unit 1.
Finally, the note following the list of protected equipment was updated to include the potential for Operational Risk in addition to Elevated Risk per the integrated risk management procedure.
Operational Risk Activities are tasks that have the potential to result in a >20 MWe load reduction from the power level(s) committed to the electric operations dispatcher or entry into a 12 hour1.388889e-4 days <br />0.00333 hours <br />1.984127e-5 weeks <br />4.566e-6 months <br /> or shorter shutdown LCO action statement with no contingency plan for immediately exiting the 12 hour1.388889e-4 days <br />0.00333 hours <br />1.984127e-5 weeks <br />4.566e-6 months <br /> shutdown LCO action statement. Elevated Risk Activities are tasks that may not fall into the Operational Risk category, but still have risk that warrants additional oversight and attention.
Supplement to License Amendment Request Proposed Change to Technical Specification 3.8.1 Action D.3 Page 2 of 2 of this submittal provides a complete updated list of operator actions to be briefed, protected fire areas, and protected equipment for the extended CT period. All other compensatory measures described in the Reference remain unchanged.
Attachments 3 and 4 of this submittal provide an updated markup of the affected TS page and the associated clean page, respectively. The update adds a reference to this supplement to document the updated compensatory measures for the extended CT.
ATTACHMENT 2 Supplement to License Amendment Request Calvert Cliffs Nuclear Power Plant, Unit 2 Renewed Facility Operating License No. DPR-69 NRC Docket No. 50-318 Updated Compensatory Measures
Supplement to License Amendment Request Proposed Change to Technical Specification 3.8.1 Action D.3 Page 1 of 2 Brief Operator Actions RCP Trip Strategy Align AFW for Long-Term Flow Align AFW for Once-Through-Core-Cooling Transfer AFW Control from Control Room to Aux Shutdown Panel Identify and Diagnose Steam Generator Tube Rupture Identify and Diagnose Steam Generator Level Refill Refuel Water Tank Control AFW Flow Protect Fire Areas Unit-1 Cable Spreading Room Unit-2 Cable Spreading Room Unit-2 27 Switchgear Room Protect Equipment*
500 kV Breakers 552-11, 552-13, 552-41, 552-51, 552-61, 552-63, and control room hand switches 500 kV Switchyard Control House o
Relay Room o
Control Panel P-13000-2 Service Transformer o
Transformer o
Feeder Breaker o
Control Room console P-13000-3 Service Transformer o
Transformer o
Feeder Breaker o
Control Room console 13.8 kV Bus 21 o
Unit 2 Metal Clad Enclosure and all enclosed breakers, including feeder breaker o
Control Room Feeder Breaker Hand Switch U-4000-21 13.8/4.16 kV Transformer o
Transformer o
Feeder Breaker o
Control Room Feeder Breaker Hand Switch U-4000-22 13.8/4.16 kV Transformer o
Transformer o
Feeder Breaker o
Control Room Feeder Breaker Hand Switch 4.16 kV ESF Bus 11 o
Bus o
Feeder Breaker o
Control Room Feeder Breaker Hand Switch
Supplement to License Amendment Request Proposed Change to Technical Specification 3.8.1 Action D.3 Page 2 of 2 4.16 kV ESF Bus 21 o
Bus o
Feeder Breaker o
Control Room Feeder Breaker Hand Switch 4.16 kV ESF Bus 24 o
Bus o
Feeder Breaker o
Control Room Feeder Breaker Hand Switch 1A, 1B, 2A, 2B, and 0C DGs o
Control Room Console o
Diesel Generator Room 21 and 22 AFW Steam Trains, Pumps and Control Valves 11 and 12 CR HVAC o
Fan housing o
Fan breaker o
Compressor breaker o
Fan Hand Switch
- Note: During the extended CT, limited work will be performed on systems and components identified as protected equipment. This work will be approved by the protected equipment procedure (OP-AA-108-117) and will require a targeted pre-job brief, supervisor oversight in the field, and periodic monitoring by an Operations Supervisor. Additionally, if this work screens as Operational or Elevated Risk per the Integrated Risk Management procedure (OP-AA-107), a risk mitigation plan will also be required to specify actions required to mitigate any potential errors. Work will not be allowed on both 11 and 12 CREVS/CRETS power supplies at the same time.
ATTACHMENT 3 Supplement to License Amendment Request Calvert Cliffs Nuclear Power Plant, Unit 2 Renewed Facility Operating License No. DPR-69 NRC Docket No. 50-318 Updated Proposed Technical Specification Change (Markup)
TS Page 3.8.1-5
AC Sources-Operating 3.8.1 CALVERT CLIFFS - UNIT 1 3.8.1-5 Amendment No. 328 CALVERT CLIFFS - UNIT 2 Amendment No. 306 CONDITION REQUIRED ACTION COMPLETION TIME D.
LCO 3.8.1.c offsite circuit inoperable.
NOTE -----------
Enter applicable Conditions and Required Actions of LCO 3.8.9, "Distribution Systems-Operating," when Condition D is entered with no AC power source to a train.
D.1 Perform SR 3.8.1.1 or SR 3.8.1.2 for required OPERABLE offsite circuit(s).
AND D.2 Declare, CREVS or CRETS with no offsite power available inoperable when the redundant CREVS or CRETS is inoperable.
AND D.3 Declare CREVS and CRETS supported by the inoperable offsite circuit inoperable.
1 hour1.157407e-5 days <br />2.777778e-4 hours <br />1.653439e-6 weeks <br />3.805e-7 months <br /> AND Once per 8 hours9.259259e-5 days <br />0.00222 hours <br />1.322751e-5 weeks <br />3.044e-6 months <br /> thereafter 24 hours2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br /> from discovery of no offsite power to one train concurrent with inoperability of redundant required feature(s) 72 hour8.333333e-4 days <br />0.02 hours <br />1.190476e-4 weeks <br />2.7396e-5 months <br />s*
- Or 14 days, once during each applicable 2019 and 2020 Refuel Outage, for the connection of the new P-13000 Service Transformer.
Prior to entry into the 14-day Completion Time, the OC DG and the SMECO 69 kV Line shall be verified available. During the 14-day Completion Time, the OC DG and SMECO 60 kV Line shall be verified available once per shift.
If both the OC DG and SMECO 69 kV Line become un-available during the 14-day Completion Time, either the OC DG or the SMECO 69 kV Line shall be restored to available status within 24 hours2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br />, or the Unit shall be brought to MODE 3 within 6 hours6.944444e-5 days <br />0.00167 hours <br />9.920635e-6 weeks <br />2.283e-6 months <br /> and MODE 5 within 36 hours4.166667e-4 days <br />0.01 hours <br />5.952381e-5 weeks <br />1.3698e-5 months <br />.
ACTIONS (continued)
Replace with Insert 1
Insert 1:
- Or 14 days, once during the Unit 1 2026 Refuel Outage, for electrical modifications and restoration work associated with the 13.8 kV Service Bus 11. Compensatory measures detailed within Constellation Energy Generation, LLC letters dated October 2, 2025, and February 2, 2026, shall be implemented and shall remain in effect during the extended Completion Time period.
Prior to entry into the extended Completion Time, the 0C DG shall be verified available.
During the extended Completion Time, the 0C DG shall be verified available once per 12-hour shift.
If the 0C DG becomes un-available 9 or more days following entry into this Action statement, the 0C DG shall be restored to available status within 24 hours2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br />, or the Unit shall be brought to MODE 3 within 6 hours6.944444e-5 days <br />0.00167 hours <br />9.920635e-6 weeks <br />2.283e-6 months <br /> and MODE 5 within 36 hours4.166667e-4 days <br />0.01 hours <br />5.952381e-5 weeks <br />1.3698e-5 months <br />.
ATTACHMENT 4 Supplement to License Amendment Request Calvert Cliffs Nuclear Power Plant, Unit 2 Renewed Facility Operating License No. DPR-69 NRC Docket No. 50-318 Updated Proposed Technical Specification Change (Clean)
TS Page 3.8.1-5
AC Sources-Operating 3.8.1 CALVERT CLIFFS - UNIT 1 3.8.1-5 CALVERT CLIFFS - UNIT 2 Amendment No. 328 Amendment No.
ACTIONS (continued)
CONDITION REQUIRED ACTION COMPLETION TIME D.
LCO 3.8.1.c offsite circuit inoperable.
NOTE -----------
Enter applicable Conditions and Required Actions of LCO 3.8.9, "Distribution Systems-Operating," when Condition D is entered with no AC power source to a train.
D.1 Perform SR 3.8.1.1 or SR 3.8.1.2 for required OPERABLE offsite circuit(s).
AND D.2 Declare, CREVS or CRETS with no offsite power available inoperable when the redundant CREVS or CRETS is inoperable.
AND D.3 Declare CREVS and CRETS supported by the inoperable offsite circuit inoperable.
1 hour1.157407e-5 days <br />2.777778e-4 hours <br />1.653439e-6 weeks <br />3.805e-7 months <br /> AND Once per 8 hours9.259259e-5 days <br />0.00222 hours <br />1.322751e-5 weeks <br />3.044e-6 months <br /> thereafter 24 hours2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br /> from discovery of no offsite power to one train concurrent with inoperability of redundant required feature(s) 72 hour8.333333e-4 days <br />0.02 hours <br />1.190476e-4 weeks <br />2.7396e-5 months <br />s*
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