ML021510020
| ML021510020 | |
| Person / Time | |
|---|---|
| Site: | Palo Verde  |
| Issue date: | 05/30/2002 |
| From: | Arizona Public Service Co |
| To: | Office of Nuclear Reactor Regulation |
| References | |
| Download: ML021510020 (14) | |
Text
I Nuclear Fuel Update Palo Verde Nuclear Generating Station May 30,2002 Meeting with US NRC Review of 2001
- March 2001 Meeting with NRR
+ Approval of new MDNBR Limit
- Progress with Clad Performance
+ Alloy A LFA Approved For 4th Burn
- CENTS Code Added to COLR
- Begin Transition to Westinghouse Rod
- Zirlo Tech Spec Submitted 7.
2 Agenda Today
+ Review of Unit 2 Cycle 11
- CENTS Implementation & Licensing
- Integrated Clad Performance Strategy
+ Update on CEA Investigation
+ Dry Cask Storage Update Unit 2 Cycle 11 Activities Incorporated in the Reload Safety Analyses 4
3 U2C1 1 Reload Analyses
+ Implementation of New MDNBR Limit
- Manufacturing Transition to Columbia
- Implementation of Zirlo Clad & New LOCA Methodology
- Implementation of New CENTS AORs CENTS System Code Implementation & Licensing
CENTS Implementation Plan
+ Generic Letter 83-11 Supplement 1
- All UFSAR Chapter 15 Analyses
+ Two Events Remain In Progress
- Steam Generator Tube Rupture
- CEA Ejection Dose Consequences Steam Generator Tube Rupture
- Consequences Increase > Minimal
- Principal Contributors
- Timing of Aux FW & ADV opening
- New Limiting SG Level
- Retain Current CESEC AOR Until CENTS Analysis Reviewed & Approved
- Consistent With RSG/PUR Submittal 8
10 CEA Ejection Dose Consequences
- Evaluating CENTS Applicability
+ Will Submit if Required
+ Retain Current CESEC AOR Until CENTS Implemented
- Will Not Impact RSG/PUR Submittal 9I Palo Verde Integrated Clad Performance Strategy Review of Recent Capabilities U2 Uprate Corrosion Strategy
Integrated Fuel Clad Strategy
- Advanced Clad Alloys
- Primary System Chemistry
- Higher Order Modeling
- Low Duty Core Designs Advanced Clad Alloys
- Full Batch Zirlo starting U2C1 1 (Spring 2002)
- Alloy A LTA in U3C1 0 (Spring 2003)
- Continuing Discussions with Westinghouse 12 6
"7 Primary Chemistry
- Early Lithium Injection During Startups
- Elevated-Coordinated Lithium Strategy
- Currently 7.1 pH
- Inspection U1 R1 0 (Fall 2002)
- Gradual Increase to > 7.2 pH 13 Higher Order Modeling
- Uncertainty in Behaviors
- Multiple Models
- Steaming Rate Function in Design Tools
- U3C9 Benchmark
+ APS CRUD/Oxide Model
- Pin x Pin Colorset and Coarse Mesh Octant
+ Vendor Fuel Duty Model
- Oxide and FDI for all Clads 14
8 Low Duty Core Designs
- Increase Feed Batch Size
- 104 vs 96 Assemblies
- Minimal Feed-Face-Feed
+ U2 Uprate Corrosion Strategy
- 3% Power and 22F Coolant Temperature
- Zirlo Clad
- Re-design Lattice Pattern 15
Review of CEA Replacement
+ CEA Finger Failures Observed - all Units
- Significant Cracks in High Fluence CEAs
- Some Medium Fluence CEA Cracking
- U2R8 CEA Found Cracked (Jan. 2002)
- All Full Length CEAs Replaced
- Two Different Tip Designs
- Replaced by Design with Smallest Pellet 9
10 Apparent Cause of Failures
- IASCC of Cladding
- Irradiation Sensitized Inconel
- Swelling-induced Strain
- Less than Adequate Design Testing
- Feltmetal Properties Unverified at High Duty
- Pellet-Feltmetal Interaction
- Lifetime Predictive Software
- Models Not Fully Benchmarked 19 Remaining Actions
- Determine Conservative Estimate of Life
- 2 Cycle Fingers OK
- Possible YGN Inspections
- Possible Hot Cell Exams
- 2x1 021 n/cm2 Threshold?
+ CEA re-Design for the Future 20
11
Project Schedule
- Concrete Cask fab completed 3/31/02
- First Canister delivery 6/28/02
+ ISFSI Construction complete 8/19/02
- Security features installed 9/15/02
+ Dry run practice begins 8/1/02
- NRC dry run observations mid Noverm
- First system on the pad by Christmas
- t2Ž
t.*'44g
U iber
Co pleted VCCs
Palo Verde Dry Cask Storage Principal Components (Cut-away View)
Dimensions:
Dimensions:
Transfer cask Loaded canister vCC Weight:
Transfer cask Loaded canister vCC Loaded system I
Adapter Plate with Hydraulic Actuated Doors 4 Vertical Concrete Storage Cask Ht. 16 ft. 11 in.
Dia. 7 ft. 1 in.
Ht. 15ft. 11 in.
Dia. 5 ft. 7 in.
Ht. 18ft. 10 in.
Dia. 11ft. 4 in.
60 tons 35 tons 119 tons 154 tons