ML22124A149

(Ccnpp) Control Element Assembly (CEA) Recovery Time Improvement Project LAR Pre-Submittal Non-Proprietary (Public)

ML22124A149
Person / Time
Site:	Calvert Cliffs
Issue date:	05/10/2022
From:	Constellation Energy Nuclear Group
To:	Jason Paige NRC/NRR/DORL/LPL1
Marshall M, NRR/DORL/LPL1, 415-2781
Shared Package
ML22124A157	List: ML22124A148 ML22124A149 ML22159A227
References
Download: ML22124A149 (11)

Text

Calvert Cliffs Nuclear Power Plant Control Element Assembly Recovery Time Improvement Project LAR NRC Pre-submittal Meeting May 10, 2022 Non-Proprietary

• Introductions

• Background

• Current Calvert Cliffs Nuclear Power Plant (CCNPP) Technical Specifications (TS)

• Proposed Change to TS 3.1.4

• Associated License Amendment Request (LAR) and Engineering Modifications

• Submittal Schedule Agenda CEA Recovery Time Improvement 1

Licensing Darani Reddick, Director Licensing Dave Helker, Senior Manager Licensing Wendi Croft, Principal Regulatory Engineer Larry Smith, Manager Site Regulatory Assurance Art Simpson, Principal Regulatory Engineer Nuclear Fuels Tamara Stathes, Manager Nuclear Fuels Seth Spooner, Senior Manager Nuclear Fuels Lewis Wells, Senior Staff Fuels Engineer Chris Staum, Senior Staff Fuels Engineer Tim Schearer, Senior Staff Fuels Engineer Reactor Engineering Ken Conner, Manager Reactor Engineering Alex Broderick, Reactor Engineer Introductions - Constellation Team CEA Recovery Time Improvement 2

Framatome

• Rachel Love, Project Manager

• CJ Markum, Neutronics Engineer

• Morris Byram, Licensing and Regulatory Affairs

• Fernando Cortazar, Neutronics Engineer

• Mohsin Reza, Neutronics Engineer

• John Adams, Safety Analysis Supervisor

• Jeff Moore, Safety Analysis Engineer

• Jim Hoerner, Thermal Mechanics Engineer Introductions - Framatome Team CEA Recovery Time Improvement 3

• CCNPP has observed a trend with the current configuration where a single-point vulnerability caused a Control Element Assembly (CEA) to become misaligned in the core at full power.

- CCNPP is replacing the current CEA drive system on both Units (2023/2024)

• Under the current TS, if a CEA is misaligned > 15 inches in Modes 1 and 2, the site is required to:

- Restore CEA in accordance with the Core Operating Limits Report (COLR) (0 to 2 hours2.314815e-5 days <br />5.555556e-4 hours <br />3.306878e-6 weeks <br />7.61e-7 months <br /> based on Fr T) OR

- Reduce Reactor Thermal Power (RTP) to < 70% within 1 hour1.157407e-5 days <br />2.777778e-4 hours <br />1.653439e-6 weeks <br />3.805e-7 months <br /> AND

- Restore CEA within 2 hours2.314815e-5 days <br />5.555556e-4 hours <br />3.306878e-6 weeks <br />7.61e-7 months <br />, OR

- Be in Mode 3 within 6 hours6.944444e-5 days <br />0.00167 hours <br />9.920635e-6 weeks <br />2.283e-6 months <br />.

Background

CEA Recovery Time Improvement 4

Current CCNPP Technical Specifications CEA Recovery Time Improvement 5

Proposed Change to TS 3.1.4 CEA Recovery Time Improvement 6

• Under the proposed TS change, if a CEA is misaligned > 15 inches in Modes 1 and 2, the site is required to:

- Restore CEA in accordance with the COLR OR

- Reduce RTP to < 60% within 1 hour1.157407e-5 days <br />2.777778e-4 hours <br />1.653439e-6 weeks <br />3.805e-7 months <br /> AND

- Restore CEA within 7 days

- Be in Mode 3 within 6 hours6.944444e-5 days <br />0.00167 hours <br />9.920635e-6 weeks <br />2.283e-6 months <br />.

• The recently withdrawn Studsvik LAR is not associated/linked with this planned LAR Constellation is planning to separately submit documentation to meet Generic Letter 83-11 demonstration / verification requirements (not under 50.90)

The Studsvik Topical Report SSP-14-P01/028-TR is NOT an input in the Framatome analysis Associated LAR and Engineering Modifications CEA Recovery Time Improvement 7

• The GARDEL Engineering Modification will

- Install new core monitoring software

- Be completed in December 2023

• Constellation is strategically submitting the CEA Recovery Time Improvement Project LAR in 4Q2022 to permit implementation shortly after the GARDEL Engineering Modification is complete to provide the maximum misaligned CEA recovery benefit

- COLR change will be implemented after GARDEL is installed

- TS Changes will be implemented during startup from CCNPP U1 2024 Spring RFO (mid-cycle U2)

Associated LAR and Engineering Modifications CEA Recovery Time Improvement 8

Submittal Schedule CEA Recovery Time Improvement 9

Action Date

• Submittal of CEA Recovery Time Improvement Project LAR 4Q2022

• CCNPP replacing the CEA drive system on Unit 2 02/2023 CCNPP U2 Spring RFO

• GARDEL Engineering Modification Complete 12/2023

• Projected NRC approval of CEA Recovery Time Improvement Project LAR 4Q2023

• CCNPP replacing the CEA drive system on Unit 1 and CEA Recovery Time Improvement Project LAR Implementation for both CCNPP Units 02/2024 CCNPP U1 Spring RFO

CEA Recovery Time Improvement 10 End of Public Portion