ML030800247
| ML030800247 | |
| Person / Time | |
|---|---|
| Site: | Mcguire, Turkey Point, McGuire  |
| Issue date: | 12/10/2002 |
| From: | George Adams, Glenn J Duke Power Co, Florida Power & Light Co |
| To: | Office of Nuclear Reactor Regulation |
| References | |
| Download: ML030800247 (29) | |
Text
Duke-FPL-NRC Meeting RackSaver Licensing Jimmy Glenn / Glenn Adams December 10, 2002 FPL
,Duke Power.
A Duke Energy Company
RackSaver Licensing
° Meeting Objectives
- Update NRC staff on Boraflex remedies
- Establish lines of communication
- Communicate RackSaver licensing plans
- Seek staff comments on licensing approach
- Followup action items 2
RackSaver Licensing
- Background
- Boraflex degradation (GL 96-04)
- Further degradation means lost cells
- McGuire
- Boraflex test performed 1997, 2000, and July 2002
- Turkey Point
"* Inoperable cells (-70 waterholes)
"* Next Boraflex test 2004
- FPL-NRC Meeting 1-15-02 on RackSavers 3
RackSaver Licensing l Current Situation
-Duke =-McGuire FPL - Turkey-Point Quantity Boraflex cells 286 (Region 1) / 1177 (Region 2) 2808 Rack Design Westinghouse Westinghouse Fuel Design Westinghouse 17 x 17 Westinghouse 15 xi15 Soluble Boron Credit Yes Yes Boraflex Credit Partial Partial Solution Rerack (Region 1)!/ Inserts (Region 2)
Rack Inserts Submittal Date 7/03 10/03 4
RackSaver Licensing
° Potential Boraflex Solutions
- RackSaver inserts
- Checkerboard - many fuel moves, lost cells
- Guide tube inserts - expensive
- disposal of existing inserts (BPs, TPs, CRs)
- Rerack - expensive, many fuel moves
- cask loadings (McGuire) 5
RackSaver Licensing
- RackSaverTM Inserts
-Borated stainless steel Metamic - borated aluminum
- First-of-a-kind
- Inserted over a fuel-assembly
- minimize fuel moves (V top nozzles)
- Install incrementally as-needed
- Removable 6
RackSaver Licensing Demonstrations
- Turkey Point demo 2002.:,!.
- 100 milAl 6Oosuccess e 80 mil Al 100% success
- McGuire demo 2002
- 89 mil stainless 100% success 7
RackSaver Licensing
° Nominal Clearance
- Turkey Point 9 80 mil RackSaver Fuel Assembly e Region I - 0.24 in.
o Region 2- 0.29 in.
- McGuire
- 80 mil RackSaver
- Region 2 - 0.43 in.
Fuel Assembly 1
+0 0.24" T
-0.01 I
Cell Wall '8
RackSaver Licensing
- License Amendment Content
- TS Design Features P Keff < 1.0 (unborated), < 0.95 (soluble boron)
- TS Administrative Controls 9 Fuel Storage Program
- TS LCO: Meet design features
- TS Action: Restore configuration
- TS Action for fuel /Icomponent movement
& Time restriction during fuel/!component movement o Verify pool boron concentration prior to movement and periodically 9
RackSaver Licensing
- Bases for Fuel /IComponent Action Statement
- Subcritical with soluble boron
- Low probability of dilution during fuel movement
- Ample time to re-insert RackSaver
- Ample time to re-establish acceptable configuration 10
RackSaver Licensing o Fuel Storage Program Precedent SONGs submittal (2/22/2002)
Program describes
"* Criticality codes
"* Methods to combine biases, uncertainties
"* RackSaver surveillar Spent fuel pool stora
- TS scope limited to methods, criteria loading rules 10 CFR 50.36 content Licensee-controlled-per 10 CFR 50.59 11
RackSaver Licensing
- Supporting Analyses
- Criticality analyses
- Boron dilution analyses
- Structural analyses with RackSavers installed
- Thermal analyses with RackSavers installed
- 10 CFR 50.36 review for Fuel Storage Program 12
RackSaver Licensing
- Licensing Plans
- Separate but similar submittals
- Duke submit July 2003 (approximate)
- FPL submit October 2003 (approximate)
° Differences Duke - FPL
- Insert material
"* McGuire - borated stainless
"* Turkey Point - borated stainless, Metamic, or Boral
- Fresh new fuel storage
"* McGuire - new Region 1 Boral racks
"* Turkey Point - new Boral Cask Area Rack 13
RackSaver Licensing
° Metamic Parameters
- Discussed previously with NRC staff 1/15/02
- Boron density
- Environmental performance
- corrosion resistance
- dimensional variations in service
° structural integrity
- Installation effects e potential material loss on-insertion 14
RackSaver Licensing
- Neutron transmission qualification testing
- Chemical /Ispectrometric analysis
- Macroscopic uniformity qualification testing
- Manufacturing process controls
- Surveillance testing
- Combination of testing and process controls ensures acceptable poison performance 15
RackSaver Licensing 0
Comparison of Metamic Performance Requirements Metamic Performance Requjirem"e-nts" I Dry Storage Wet Storage Functions Thermal Conductivity I_
Neutron Poison Structural Environment Boric Acid Hours Years High-Temp Dry Hours Dry, Inert Years 0
Metamic approved for use in dry storage cask
- NUHOMS-61 BT Safety Evaluation Report 16
RackSaver Licensing
° Metamic Environmental Performance
- 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 17
RackSaver Licensing
° Metamic Licensing
- ANO Topical Report
- EPRI Report
- FPL evaluation of report applicability 18
RackSaver Licensing
- Summary
- Comprehensive analyses
- Appropriate prototype demonstrations
- TS Program for fuel storage
- Questions / Followup Items 19
i Duke
'Power.
A Duke Energy Company McGuire Nuclear Station Spent Fuel Pool Boraflex Update Meeting with NRC December 10, 2002 1
Duke
'Power.,
A Duke Enei Company 12/11/2001 NRC - Duke Meeting re: MNS Boraflex
- Duke outlined the following initiatives:
-Accelerated options for dry storage
-Accelerated BADGER testing in pools
-Pursue physical/long-term rack solutions
"* Region 1
- Rerack or rack inserts
"* Region 2
- Revised soluble boron credit TS Amendment
- Rerack or rack inserts 2
Duke rPower.
A Duke Energy Company McGuire Dry Storage Status & Acceleration
- 5 TN-32's loaded and on the pad
- 5 additional TN-32's delivered/being delivered
- Scheduled loading 1st Q 2003
- Accelerated options for UMS system
- 48 systems being fabricated
- Deliveries have already begun
- Transition to UMS planned in late 2003
- Supports and provides flexibility in degradation addressing Boraflex
.".'.
3
i Duke
'Power.
A Duke Energy Compay BADGER Testing of McGuire Racks
- Initial demonstration in 1997 (Unit 2)
- First PWR demonstration
- Previous BWR demonstration at Peach Bottom e Testing of Unit 1 and 2 racks in 2000
- Soluble Boron TS Amendment committed to 3 year testing interval
- Duke elected to accelerate next BADGER campaign into Summer 2002
- Currently analyzing results 4
kDuke McGuire Region 1
'Power.
Rack Solution A Duke Energy Conpany
"* Region 1 in each pool
- Flux trap design-designed for storage of new and recently discharged fuel 2 rack modules per pool
- 286 cells per pool
"* Rerack project initiated for Region 1
- Contract signed with Holtec in May 2002
- Fabrication of 4 Region 1 modules underway D Neutron poison material - Boral
- Installation planned for April - July 2003
- Region 1 rerack implemented under 50.59 5
SDuke McGuire Region 2 OPower.E Power*
Rack Solution A Duke Energy CompanyRa kS lto
"* Region 2 in each pool Egg-crate design-designed for long-term storage of burned fuel 6 rack modules per pool 1,177 cells per pool
"* Near-Term Plan:
TS amendment to change threshold for Alpha to Bravo from 50% to 40%
"* Results in more restrictive storage requirements for Alpha cells
"* Reduces the number of Bravo cells (near-term)
"* Provides time needed to implement loqg-term solution
"* Long-term Solution:
Cell inserts (RACKSAVER)
Accelerated dry storage loadings Pu decay credit 6
k
, Duke
'Power.
A Duke Energ C*mpany McGuire Soluble Boron Credit TS Amendment
- Initially submitted April 1999-approved by NRC in November 2000
- Credit for soluble boron &
Soluble boron credit of 730 ppm)
Partial Boraflex credit by Region 1 partial Boraflex ppm (COLR 2,675 "sub-region" Reqion 2
- Alpha
- Bravo 25%
0%
'" 50%
0%
7
Pk er Revised Soluble Boron 7Power.E A DukeEnergyCompany Credit TS Amendment Submitted to NRC on April 18, 2002
- Changes threshold for Region 2 Alpha to Bravo from 50% to 40% remaining Boraflex
- All Region 2 cells remrain >40% through December 2004
- Avoids hundreds of fuel moves
- Provides more reasonable timeframe for implementing long-term Region 2 solution Needed to support Region I rerack effort in early 2003
- Tech Spec Amendment submittal package is identical in all other aspects to recently approved McGuire submittal 8
Duke APower.m A Duke EnVCo*any McGuire Region 2 Long-Term Solution
- Duke evaluated numerous options for long-term solution for Region 2
- Rerack (selected for-Region 1)
- Poison inserts
- Pu Decay 9 Inserts and Pu Decay credit selected for further evaluation I -F Integrated long-term solution may rely on both 9
Duke Summary EPower.
A Duke Energy Company
"* Duke continues to be proactive dealing with Boraflex degradation at McGuire
- Accelerated order of dry storage systems (48 UMS)
- Accelerated BADGER testing in pools
- Issuing specification/POs for rerack/inserts
"* Revised TS Amendment (50% to 40%) is essential Provides time needed to implement long-term solutions (i.e., rerack and inserts)
Eliminates hundreds of fuel moves
- Needed to support Region 1 rerack I1