ML052930317
| ML052930317 | |
| Person / Time | |
|---|---|
| Site: | Turkey Point  |
| Issue date: | 10/19/2005 |
| From: | Moroney B NRC/NRR/DLPM/LPD2 |
| To: | Florida Power & Light Co |
| Moroney B, NRR/DLPM, 415-3974 | |
| Shared Package | |
| ML052930043 | List: |
| References | |
| TAC MC8424, TAC MC8425 | |
| Download: ML052930317 (24) | |
Text
FPL NRC-FPL Meeting Turkey Point License Amendment Request Spent Fuel Pool Boraflex Remedy (Metamic Inserts and Storage Rules)
October 19, 2005 Enclosure 2
FPL Fuel Storage Organization
- Fuel Storage Projects
- Carl Bible - Manager
- Glenn Adams - Project Licensing
- Yuan Kao - Project Engineer
- Pete Sharp - Project Engineer, nuclear criticality
- Carl O'Farrill - Supervisor, Nuclear Fuels
- Plant Staff
- Paul Czaya - Turkey Point licensing
- Bob Tomonto - Reactor Engineering 2
Spent Fuel Storage Status Loss of Full Core Reserve (LOFCR)
Y LOFCR ISFSI Date Start Const First Load PSL Unit 1 2008 2006 2007 PSL Unit 2 2010 2006 2009 PTN Unit 3 2010 2007 2009 PTN Unit 4 2012 2007 2010 Seabrook 2009 2006 2008 3
Turkey Point Boraflex Remedy lW
- Meeting Objectives
- Brief NRC Staff on license amendment request
- Facilitate review
- Preliminary Staff comments
- Reduce RAIs, rules of engagement
- Address current SFP Boraflex status
- Staff concurrence on review schedule 4
Turkey Point Background
- Gamma-induced Boraflex degradation
- Potential loss of reactivity hold-down
- 2nd Areal density (BADGER) test in 2004
- Racks continue to meet design basis reqmts
- Administrative controls to manage dose on high duty racks
- Next BADGER test in 2007
- New Cask Area Racks (Boral) not affected 5
Project Objectives
- Maintain spent fuel pool storage capacity
- Eliminate reliance on Boraflex
- Ensure rack reactivity margin
- Eliminate Boraflex surveillance testing
- Minimize fuel moves
- Westinghouse fuel assembly top nozzle issue
- Flexibility in reactivity management
- Variety of storage patterns, inserts 6
Project Scope
- License Amendment Request
- New rack loading patterns o disperses high-reactivity fuel
- Metamic inserts (neutron absorber)
- TS Program to evaluate other configurations
- Fuel movement campaign
- Several hundred fuel moves per pool
- Approximately 500 Metamic inserts per pool 7
Metamic Inserts
- Metamic panels
- formed or welded
- chevron shape
- Aluminum head
- Full length
- 24 lbs each
- Inserted around fuel 8
Metamic Inserts N-
- Supplier Holtec
- Metamic LLC
- Quality Assurance
- Mill oxidized finish 9
Fuel Loading Patterns FIGURE 5.5-2 ALLOWABLE REGION 11STORAGE PATTERNS I
DEFINITION1. 4 ILLUSTRATIO N12-34 Region 112x2 Array 1IA Category 11-1 assembly in three of every four cells:
One of every four cells is empty (water-filled).
Region 112x2 Array Il-B Category 11-2 assembly in every cell: Two of every four cells contain a Metamic insert (or full length RCCA in the assembly).
112 11-2 II 11 l.2 11-2 Region 112x2 Array Il-C Checkerboard pattern of Category 11-3 and 11-E assemblies:
One of every four cells contains a Metamic insert (or full length X Metamic inserts (or RCCAs) may be in Rftj 11-3 or 11-E cells.
Region 112x2 Array ll-D Category 11-4 assembly in every cell: One of every four
&#U contains a Metamic insert (or full length RCCA in the 1V1 Lfj14
=vOW.
10
Schedule Objectives
- Timely restoration of SFP reactivity margin
- Currently meets reqmts, but degrading
- Preclude next Boraflex test (2007)
- If possible
- Continue to meet storage requirements
- Not affecting full core reserve at this time 11
Schedule Submit LAR Early 2006 RAI (if needed) 8 mos after submittal Amendment 12 mos after submittal Implementation During 2007 *
- Date negotiable. Interim configurations comply with old and new TS.
12
LAR Preparation
. Modeled after St. Lucie Boraflex Remedy
- Unit 1 amendment 193 (9/23/2004)
- Applied other precedent e RAI historical review
. Holtec -QA vendor
LAR Structure
- Wraparound Evaluation by FPL
- Roadmap of evaluation, analysis
- Information to supplement Holtec Report
- FPL (non-Holtec) evaluations
- Specific discussion of precedent
- Specific discussion of related RAls
- Holtec Report
- NSHC, EIC, TS Markup, Bases 14
Applicable Precedent
- Administrative controls - loading patterns
- St. Lucie Unit 1, Unit 2
- Use of Metamic in Spent Fuel Pools
-Topical Evaluation 6/17/2003
- Use of rack inserts in Spent Fuel Pools ANO submittal review 15
Affected Tech Specs
- LCO - Refueling Boron Concentration
. LCO - Spent Fuel Storage
- Establish new fuel loading reqmts per TS 5.5
- Relocate max fuel enrichment to TS 5.5
- Remove applicability of TS 3.0.3
- Design Featu res Fuel Storage Criticality
- Describe new fuel loading patterns
- Describe use of rack and fuel inserts
- Alternative loading patterns per NRC methodology 16
Physical Changes Evaluated
- More complex loading patterns
- Significant fuel movement campaign
- Metamic inserts reduce water inventory
- Metamic inserts reduce local convective flow
- Metamic inserts change seismic response
- Metamic potential for adverse chem reaction
- Metamic insertion may damage fuel
- Metamic surveillance requirements 17
Structural Evaluation
. Metamic inserts into racks
- contribute < 0.1% of gross wt on slab
- Whole Pool Multi-Rack WPMR Analysis
- (DYNARACK)
- Previously-NRC-accepted method 18
Thermal-Hydraulic Evaluation
- Bulk THA - displaced water within margins
- Local THA
- Metamic insert blocks two side flow channels
- Computational Fluid Dynamics analysis
- Local water temp peak is 206°F (<241 OF sat.)
- Peak clad temp is 2509 F (>241 OF sat.)
- insufficient heat flux for DNB 19
Criticality M
- Experienced vendor (Holtec International)
- Acceptance criteria per 10 CFR 50.68(b)
- Soluble boron credit for Keff 0.95 is 560 ppm or less
- Previously-accepted codes, uncertainty methods
- Explicit 3D analysis of fuel/rack geometry (MCNP4a)
- Fuel burnup isotopics calculated (CASMO-4) 20
Criticality Review
- Loading patterns, correlation table
- Previous RAls incorporated:
- Criticality criterion 10 CFR 50.68(b)
- Sample Keff calculation
- Quality controls on fuel, materials
- Verification of calculated burnup
- Integrity of RCCAs for neutron absorption
- Configuration control on inserts
- Unit differences
- Managing new fuel types
- Boron Dilution Event (bounded) 21
Materials - Metamic Guidance
- Metamic Surveillance Program
- Inspect inservice inserts, not coupons
- B-1 0 composition, distribution assured by QA/QC
- Simulation of scratches (monitor actual scratches)
- Frequency (start within 48 mos. of service)
- Tests (visual)
- Mill oxidized finish, not anodized
- Cleaning technique - glass beading e Limitation of 31 wt percent boron carbide 22
Proposed Rules of Engagement
- FPL extensive use of precedent
- FPL consideration of previous RAls
- FPL points of contact for Staff questions
- Example - Metamic insert tolerance
- One RAI within 8 months
- LIC-1 01 threshold for formal questions 23
Summary
- Summary
- Comprehensive analyses per guidance
- Previously-approved methods, precedent
- One-year review schedule
- Potential for future TS Program for fuel storage
- Proposed rules of engagement
- Questions / Followup Items 24