ML22124A148
| ML22124A148 | |
| 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: |
| References | |
| Download: ML22124A148 (4) | |
Text
Calvert Cliffs Nuclear Power Plant Control Element Assembly Recovery Time Improvement Project LAR NRC Pre-submittal Meeting May 10, 2022 Proprietary (Redacted Version)
- Framatome performed calculations that validate extended operation at reduced power level with a single misaligned regulating rod.
- [ The Framatome analysis considered the following conditions:
- Hot Full Power Initial-State (most limiting)
- Five (5) times in life (BOC, Early-MOC, MOC, Late-MOC and EOC)
- Location of the misaligned CEA
- Time spent at full power before power reduction (COLR Limit)
- Time at reduced power condition
- Analysis through duration of CEA recovery ]
Supporting Framatome Analysis Summary CEA Recovery Time Improvement Privileged and Confidential 1
FRAMATOME PROPRIETARY
Supporting Framatome Analysis Summary (cont.)
CEA Recovery Time Improvement Privileged and Confidential 2
- Analysis validated a reduction to 60% Reactor Thermal Power (RTP) provided adequate margin for safe operation
- [ FR T behavior for the analyzed conditions meet FR T LCO during operation at 60%
- Extended operation for up to 7 days
- 60% RTP must be maintained until the dropped CEA is fully recovered. ]
- After the recovery of the misaligned CEA
- [ Reactor can return to full power using vendor supported ramp rate limits
- Evaluation of FR T until the return of steady state conditions ]
- [ All LCOs must be met, including required actions, during the CEA misalignment and recovery ]
FRAMATOME PROPRIETARY
LAR Acceptance and Review CEA Recovery Time Improvement Privileged and Confidential 3