ML050350086
| ML050350086 | |
| Person / Time | |
|---|---|
| Site: | Cook  |
| Issue date: | 02/07/2005 |
| From: | Indiana Michigan Power Co |
| To: | Office of Nuclear Reactor Regulation |
| Lyon C, NRR/DLPM, 415-1292 | |
| References | |
| Download: ML050350086 (16) | |
Text
INDIAN AEP/W NRC Meeting DEC. Cook Unit 1 Fuel Upgrade February 3,2005 1
Agenda / Alignment ARE
- Cook Unit 1 15x1 5 fretting wear issues
- Proposed 15x15 Upgrade fuel design
- LOCA re-analysis commitments
- Past experience / lessons learned
- Analyses and methodology changes
- Technical Specification changes / submittals required
- Schedule / options
- NRC feedback 2
Fretting Wear Issues
- Past Unit 1 fuel rod failures
- Current 15x1 5 fuel assembly design
- Proposed 15x15 fuel assembly design Benefit: Design to eliminate (significantly reduce) grid-to-rod fretting as a potential failure mechanism 3
INDIALMA MICHIGAN POWER*
Fuel Design Description
@ Key features of 1 5x1 5 Upgrade design compared to current Cook 15x15 design Modified ZIRLOTM structural mid-grids (line contact vs point
- contact),
Modified ZIRLOTM IFM grids, and Tube-in-Tube ZIRLOTM guide thimbles 4
J 4z NDSAR POMWELL Licensing Precedence
- 15x1 5 Upgrade design Licensed under the Westinghouse Fuel Criteria Evaluation Process (FCEP), WCAP-12488-A Per the SER requirements for FCEP, NRC notification required Detailed design aspects in LTR-NRC-04-8, dated February 6, 2004 5
Design Precedence and
-R07 Application
@ Design aspects:
Applicable DNB correlation - WRB-1
- no change-currently usedl5xl5 V5HN+ Cook Unit 1 Slight decrease in fuel assembly loss coefficients No new methodology required to support the fuel design
- Current use for full region application
- Indian Point Unit 2
- Indian Point Unit 3 6
9NDIANA MICHIGAN BOWER*
Lessons Learned
@ Past fuel transition experience / lessons learned Early dialogue is very beneficial Face-to-face discussions w/ Staff Technical Reviewers is very positive for LAR development I process
- W / NRC Fuel Performance Meeting (12/7/04)
Only load core with NRC approved fuel design and analyses Schedule pre-application meeting Secure regulatory concurrence with the plan 7
Impact Assessment
- Minimize changes to current licensing bases
@ Complete assessment of plant impacts
- Assessment results define the required Analyses/Evaluations Thermal / Hydraulic Analyses Anticipated Operation Occurrence (AOO) Transient Analyses Accident Analyses Special Analyses 8
Analyses / Methodology Changes INDIAim MICHIGAN POWER 9:
- Opportunity to re-analyze with state-of-the-art LOCA methodology Unit 1 LBLOCA analysis using ASTRUM (WCAP-16009-P-A)
WCAP-1 6009-P-A NRC-approved 11/5/2004 Limited Technical Specification change
- COLR changes expected
- Balance Cook near-term & long-term goals 9
-8NDEANA Planned NRC Submittals
- License Amendment Request
- LBLOCA analysis using the NRC-approved ASTRUM methodology
-Add WCAP-16009-P-A (ASTRUM) to Tech Spec reference list for methods used to determine Thermal Limits in COLR
- Current TS Section 6.9.1.9.2
- Improved TS Section 5.6.5.b
- 10 CFR 50.46 commitment
- SBLOCA re-analysis using NOTRUMP
- Currently used, NRC-approved, Appendix K methodology 10
Options Cycle 21 (Fall '06) implementation - interim Appendix K assessment Preferable for timely resolution of fuel fretting wear WCOBRA/TRAC-based PCT assessment to current Appendix K LBLOCA AOR (BASH Evaluation Model)
ASTRUM analysis of LBLOCA & COLR TS change for WCAP-1 6009-P-A submitted for NRC approval Approval mid-Cycle 21 Cycle 22 (Spring '08) implementation Fuel fretting issue resolution delayed 18 months Approval mid-Cycle 21 Not preferred option - inconsistent with AEP/W standards 11
Transition Core Assessment
- Use WCOBRA/TRAC to assess transition core effects Line item on BASH Evaluation Model (EM) PCT rack-up sheet
- Justification
- WCOBRA/TRAC can explicitly model transition effects
- Loss coefficients
- Grid heat transfer
- Code applicability
- Temporary PCT assessment for a fuel cycle 12
INDIAN Schedule - Fall '06 (Cycle 21, interim App K assessment)
- Interim Appendix K assessments
- Fuel reload 50.59 complete
- Startup U1C21 with 1st reiion Upgraded fuel
- SBLOCA re-analysis (10CFR50.46)
- NRC approval of LAR
- Startup U1C22 with 2nd region Upgraded fuel
- May-Aug Aug Fall Jan
< Mar
'- Jan Spring 2006 2006 2006 2007 2007 2008 2008 13
INDIAMA MICMIGAM POWERe Schedule - Spring '08 (Cycle 22, ASTRUM LBLOCA)
- Startup U1 C21 with current fuel product
- SBLOCA re-analysis (10CFR50.46)
- LAR approval Fall 2006 Jan 2007
< Mar 2007
-Jan 2008
- Startup U 1 C22 with 1 st Upgraded fuel product region Spring 2008 14
NRC Feedback a Presentation addressed:
Fuel design description
- Analyses and methodology changes Technical Specification changes
- Options Schedule 15
INDIANA MICHIGAN POLIVERM Objectives
- Describe 15x1 5 Upgrade fuel
@ Discuss analyses / methodology to implement
- Understand NRC submittals required
- Discuss submittal schedule and options
- Obtain NRC feedback 16