ML103260142
| ML103260142 | |
| Person / Time | |
|---|---|
| Site: | LaSalle  |
| Issue date: | 11/10/2010 |
| From: | Hansett P Exelon Nuclear |
| To: | Office of Nuclear Reactor Regulation |
| David Marshall NRR/DORL/LPL3-2 415-154 | |
| Shared Package | |
| ML103260148 | List: |
| References | |
| Download: ML103260142 (10) | |
Text
1 LaSalle County Station Unit 2 Spent Fuel Storage Racks November 10, 2010
2 Phil Hansett Manager, Reactor Engineering SFP Management Strategy Proposed Actions
3 Proposed Actions Categorize Unit 2 locations into three groups
- UNUSABLE (>52.27% Degradation)
- RESTRICTED (>29.97% Degradation)
- UNRESTRICTED (<29.97% Degradation)
Fuel will have >27.5% margin to allowable degradation limit No fuel can be stored in UNUSABLE locations Low reactivity fuel (Cycle 1 and GE14) can be stored in RESTRICTED locations All fuel can be stored in UNRESTRICTED locations Criteria is applied to cells on each side of the panel in question Continue use of RACKLIFE Version 2.0
4 Discharged Fuel at LaSalle 0.9500 96.9%
Cycle 1 GE (8x8)
(Maximum 2.32 wt% enrichment) 0.9499 79.8%
GE14 (10x10) 0.9500 68.1%
ATRIUM-9B (9x9) 0.9499 65.3%
Legacy (Cycle 2+) GE (8x8) 0.9499 57.5%
ATRIUM-10(XM) (10x10)
Resultant In-Rack Keff Maximum Allowable Panel Thickness Reduction Fuel Type in SFP
5 Impact of Proposed Actions July 1, 2011, projection with three racks complete
- 1017 UNUSABLE locations
- 1138 RESTRICTED locations 2104 assemblies on-site meet the low reactivity definition for storage in RESTRICTED locations Approximately 2000 moves are required to reconfigure SFP to new criteria
6 Proposed Insert Implementation Schedule Required to perform Spring 2011 refueling outage (L2R13)
- NRC issues license amendment prior to L2R13
- Install inserts in three most-degraded racks
- 626 inserts required for three racks
- Recover 408 cell locations Pool reconfiguration will be complete within 120 days following L2R13 Dry cask campaign is moving forward in parallel with insert installation activities
- Gain 68 operable locations per cask
- Anticipate three casks loaded prior to L2R13
7 Proposed Insert Implementation Required Resources Target completion of three racks before L2R13
- Dedicated Reactor Services crew for pool configuration and insert installation
- Scope includes additional rechanneling and movement of blade guides and fuel to facilitate insert installation Projected to complete insert installation in all racks by December 31, 2014
8 NRC Feedback
9 Ken Nicely Licensing Next Steps
10 Next Steps Incorporate NRC feedback Submit supplement to license amendment request to document proposed actions (planned November 19, 2010)
Actions will be proposed as license conditions associated with the amendment
- Categorize locations into three groups
- Reconfigure SFP to new criteria within 120 days following L2R13
- Complete insert installation in all racks by December 31, 2014