ML020280172
| ML020280172 | |
| Person / Time | |
|---|---|
| Site: | Turkey Point  |
| Issue date: | 01/15/2002 |
| From: | NRC/NRR/DLPM/LPD2 |
| To: | NRC/NRR/DLPM/LPD2 |
| References | |
| Download: ML020280172 (28) | |
Text
FPL Turkey Point Spent Fuel Storage January 15, 2002
Turkey Point Spent Fuel Storage
- Agenda
- Objectives / Background
- Spent fuel storage status
- Cask pit racks
- Poison insert material - MetamicTM
- Discussion
- Summary 2
Turkey Point Spent Fuel Storage
- Objectives
- FPL share information on:
"* Short-Term storage plans
- Cask pit racks
- Poison inserts
"* Schedule for license amendments, NRC reviews
"* Analysis methods
"* Metamic for neutron poison material
- NRC-FPL discussion of these items 3
Turkey Point Spent Fuel Storage e Background
- High density BoraflexTM unit storage pools for each
- 1404 cells in each pool
- 286 cells in Region I (fresh 4.5 wt% fuel)
- 1118 cells in Region 11(4.5 wt%, >36,746 MWD/MTU) 4
Turkey Point Spent Fuel Storage Turkey Point 3 Spent Fuel Storage
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-SFP Capacity - No Boraflex Degradation LOFCR
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Turkey Point Spent Fuel Storage
- Background
- Current licensing bases
"* License Amendments 206 (Unit 3) and 200 (Unit 4)
"* Approved July 19, 2000
"* Criticality analysis uses partial credit for Boraflex 6
Turkey Point Spent Fuel Storage
- Background
- Unit 3 Boraflex surveillance using BADGER
"° Test performed in Fall 2000, completed Jan 2001
"* Non-uniform axial degradation observed in Region II
"* Test results analyzed and corrective actions taken FPL submitted report May 16, 2001 (L-2001-115)
- Next Boraflex areal density test planned for 2004 FPL does not plan to rely on Boraflex for long-term 7
Turkey Point Spent Fuel Storage
- Spent Fuel Storage Strategy
- Maintain nuclear safety margins e Eliminate reliance on Boraflex
- Maintain current spent fuel storage capacity
- Maintain full core offload reserve
-Provide fiscally-responsible solutions
- Commonality with St. Lucie
- Predictable and acceptable regulatory solution 8
Turkey Point Spent Fuel Storage
- Spent Fuel Storage Proposed Plan
- Evaluated options to maintain current spent fuel storage capacity
- Selected option is:
"* Cask pit racks
"* Poison inserts
- Preliminary analysis requires 550 rack inserts 9
Turkey Point Spent Fuel Storage
- Cask Pit Racks Region I cask pit racks selected:
"* Accommodates full core discharges
"* Boral used as poison material
"* Prolongs life of Boraflex racks
"* Reduces scope of poison inserts
- existing Region I will store twice-burned discharged fuel
- will reduce poison requirements in Region II 10
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Turkey Point Spent Fuel Storage
- Cask Pit Racks
- Region I design (121 cells) for each rack
- Extends loss of full core reserve by 2 cycles
- Cask pit area can be restored for cask loading
- Similar to Waterford cask pit racks
"* Licensed in 1998
"* Operational success loading fuel discharges 12
Turkey Pe nt Spent Fuel Storage
- Cask Pit Racks
-Schedule targets
"* Submit proposed license amendment (PLA) Fall 2002
"* FPL plans to proceed in parallel with NRC review
"* Request NRC approval by Fall 2003
"* Install both racks in Spring 2004 13
Turkey Point Spent Fuel Storage
- Cask Pit Rack PLA
-Analyses
"* Criticality criteria per 10 CFR 50.68
"* Thermal-hydraulic analysis using 3-D modeling
"* Radiological analyses - standard methods, criteria
"* Seismic using stand-alone cask pit rack
- Decoupled from existing racks
-Comparable to Improved Standard Tech Specs
"* Maximum initial enrichment
"* Keff < 0.95 in unborated water
"* Burnup / enrichment curve for Region II racks
"* Nominal rack cell pitch 14
Turkey Point Spent Fuel Storage
- Neutron Poison Inserts
-Metamic as a neutron poison
-Rack inserts (RackSaver)
-Poison fuel inserts (rodlets)
-Multi-regioning I checkerboarding
- optimizes the quantity of poison inserts 15
Turkey Point Spent Fuel Storage
- Metamic Poison Insert Material
- AI/B 4C metal matrix composite material
- Effective neutron poison material
- May be extruded, rolled into various shapes
"* Storage rack inserts (RackSaverTM)
"* Fuel assembly inserts (rodlets)
- Anodized for corrosion protection 16
Turkey Point Spent Fuel Storage 0.95
_---_----_$6,000 Effectiveness of Poison Materials
$5,000 0.9
$4,000 L,,_,, 0.85 D
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u Control Rod Hafnium BSS Cadmium Boral Metamic 1 7 Poison Materials
Turkey Point Spent Fuel Storage
- RackSaver Rack Inserts
- Metamic
- Simple installation
-Incremental installation
- No top-nozzle interference
- Avoids rodlets for W assembly Prototype tested at PWR/BWR 18
Turkey Point Spent Fuel Storage
- Pentaform Rodlets
- Metamic
- Asymmetric pentaform o improves surface area
- Simple installation
-Incremental installation
- Up to 20 per assembly
- Spiders/hubs AI
.875' 0 S 4CT O80' SECTIO3N A-A 154.0'
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19
Turkey Point Spent Fuel Storage 9 Comparison of Metamic Performance Requirements Metamic Performance Requirements Dry Storaae Wet Storage Functions Thermal Conductivity Neutron Poison V
V Structural Environment Boric Acid Hours Years High-Temp Dry Hours Dry, Inert Years
- Metamic approved for use in dry storage cask
- NUHOMS-61 BT Safety Evaluation Report 20
Turkey Point Spent Fuel Storage
- Metamic PLA Parameters
- Boron density
- Environmental performance
"° corrosion resistance
"* dimensional variations in service
"* structural integrity
- Installation effects
"* installation / removal with no damage to fuel
"* thermal-hydraulic performance
"* seismic response 21
Turkey Point Spent Fuel Storage
- Neutron transmission qualification testing
- Chemical / spectrometric analysis
- Macroscopic uniformity qualification testing
- Manufacturing process controls
- Surveillance testing
- Combination of testing and process controls ensures acceptable poison performance 22
Turkey Point Spent Fuel Storage e Metamic PLA Content - Environmental
- EPRI test demonstrates acceptable environmental performance
- Laboratory testing results (EPRI-1 003137)
"* accelerated neutron and gamma radiation testing
"° accelerated corrosion testing
"* acceptable dimensional variations in service
"* acceptable structural integrity
- Borated aluminum (e.g., Boral) has extensive operating history 23
Turkey Point Spent Fuel Storage
- Metamic PLA Content - Installation Effects
- Thermal-hydraulic analysis
- Seismic analysis
- RackSaver installation with no damage to fuel
"* Prototype trials at PWR and BWR
"* Planning prototype trials at Turkey Point in 2002 24
Turkey Point Spent Fuel Storage
- Metamic Licensing
- Site-specific PLA
"* Include use of Metamic poison inserts
"* Include proposed spent fuel pool reconfiguration
"* Comparable to Improved Standard Tech Specs
"* Criticality Analysis Method
- KENO-Va or KENO-VI for criticality analysis
- KENO-VI for criticality study of non-symmetrical shape
"* Comply with 10 CFR 50.68 criticality criteria
"* Plan to submit proposed license amendment in 2003 25
Turkey Point Spent Fuel Storage
- Spent Fuel Storage Plan
- Monitor Boraflex
- Install Region I cask pit racks
- Proposed license amendment planned for Fall 2002
- Evaluate / Optimize poison inserts
"* Fuel assembly inserts - Metamic, Boral, borated SS
"* Rack inserts (RackSaverTM) - Metamic
"° Multi-regioning, checkerboarding
- Plan to install poison inserts in 2004
- Plan to submit PLA in 2003 26
Turkey Point Spent Fuel Storage
- Discussion
- Summary of Meeting Objectives
"* Storage plans (cask pit racks, poison inserts)
"* Schedule for license amendment reviews
"* Analysis methods
"* Metamic for neutron poison material
- Followup action items 27
Turkey Point Spent Fuel Storage
- Boraflex
- Boraflex degradation dependent on
" dose
"* pool temperature
" flow rate
- EPRI RACKLIFE software
"* Calculates radiation dose to Boraflex panels
"* Predicts Boraflex dissolution