ML062570479
| ML062570479 | |
| Person / Time | |
|---|---|
| Site: | Fort Calhoun, 07201004  |
| Issue date: | 09/07/2006 |
| From: | Omaha Public Power District |
| To: | Office of Nuclear Reactor Regulation |
| Sebrosky J, NRC/NMSS 301-415-1132 | |
| Shared Package | |
| ML062570158 | List: |
| References | |
| Download: ML062570479 (16) | |
Text
Omaha Public Power District (OPPD)
Fort Calhoun Station Dry Cask Storage Meeting with NRC Spent Fuel Project Office September 7, 2006 W/7 OPPO Agenda
" Introduction
" Background
" Options
" Discussion of timeframes for decisions
" Identification of action items
" Public questions
" Closing remarks 9T71 OPPO 2
1
Introductory Comments
- NRC W7~6OPPO
3 Background
Pre-Exemption
" Loading 10 canisters was the original Fort Calhoun Station (FCS) dry cask campaign scope
" 75-ton capacity auxiliary building crane addressed by use of lighter weight transfer cask
" Use of lighter cask was believed to be allowable without NRC approval under 10 CFR 72.48 01706 PPD 4
2
=
Background===
Pre-Exemption
" NRC challenged use of lighter cask during FCS inspection prior to fuel movement
" OPPD determined that processing of exemption request and approval was best way to allow campaign to continue W710 OPPD
Background
Exemption Basis
" Maintain full core off-load capability after fall 2006 refueling
" Allow receipt and storage of new fuel
" Allow better management of decay heat loads within spent fuel pool m including minimizing fuel handling
" Inadequate time to process amendment request wt'm/e OPPI S
3
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Background===
Exemption Limits/Conditions
" Exemption issued on July 21, 2006
" Limit of 4 canisters loaded using lightweight cask
" Decay heat limited to 11 kW per canister
" Minimum 16.2 years cooling time for fuel
" Dose limits of 170 mR/hr axial and 110 mR/hr radial with supplemental shielding (24 kW)
W7V6OMP T
Background
Need for Loading Additional Canisters
" Next FCS refueling outage is spring 2008
" Loading remaining 6 canisters will:
m allow better management of decay heat loads within spent fuel pool m minimize fuel handling
" Personnel with experience from loading first 4 canisters should be available
" Better efficiency, lower exposure
'WPP S
4
Options Crane Upgrade Discussion
" Background
" Evaluation of 100-Ton Capability
" 100-ton vs. 75-Ton Evaluation
" Dose Impact
" Upgrade Costs
" Schedule Issues
" Conclusions WgIM 0M Crane Upgrade Background
" Original Auxiliary Building crane was 100-ton non-single failure proof
" NUREG-0612 (July 1980) required upgrade to single failure proof design ga/O OPPD 10 5
Crane Upgrade Background (Continued)
" Original seismic analysis did not include loads on the crane hook
" New 75-ton trolley (single failure proof) heavier than 100-ton trolley
" 75-ton fuel cask weight projected W7106 OPPD 11 Evaluation of 100-Ton Capability
" Trolley frame and wheels are adequate a brakes and gearing require modification
" Crane bridge girders are questionable
" Crane runway girders and building structure require modification
" Rail bay floor is adequate 9I7M6 04'PO 12 6
100-ton vs. 75-ton Cask Evaluation
" Three vendors provided 75-ton option
" Evaluation criteria
" Dose impact
- Crane modifications
" Upgrade
" Remote operation
- Schedule for crane modification
" Installation
" Reliability
" Licensing wft OPPO 13 Total Dose Impact
" Dose for 75-ton design estimated at
-400 mR
" Dose for 100-ton design estimated at
-200 mR
" Industry doses for 100-ton cask estimated from 200 to 1000 mR
" FCS initial campaign averaged -250 mR per canister w9/(
OPPD 14 7
Upgrade Cost
" Auxiliary Building and crane analysis
" Engineering design package preparation
" Materials/equipment
" Bridge support installation
" Building support installation
- Qualification & licensing
" Industry OE on crane upgrades is $3-10M 9*176 oPPO 15 Schedule Issues
" Long lead time for crane upgrade n Pit Rack
" Negative OE on crane reliability after modifications
" Additional time required for requalification and inspection WAIS On 18 8
Crane Upgrade Conclusions
- Crane capacity upgrade is not cost-effective
" Structural issues
" Licensing uncertainty
" Long lead times
" Reliability issues
- Very low dose can be achieved with existing crane and lightweight cask o7ff=
OPPO if Options of Lightweight Cask Future Use
" Experience at Fort Calhoun
" NRC Inspection of TN
" TN Amendment to CoC 1004 W/M6 0PPO 1a 9
Experience at Fort Calhoun
" Exemption issued on July 21
" Four canisters loaded between July 24 and August 17
" Average total exposure was approximately 250 mR per canister
- Dose per canister decreased through campaign WINQ pOM Is Total Doses for Loading Four Canisters Total Dose Expended (tirern) 600 500 400 300 200 0
0 1
2 3
4 Canel., Number SOMiV OPPD 20 10
NRC Inspection of TN
" Inspection performed August 28 and 29 in TN's Columbia, MD offices
" Inspection addressed the remaining issues identified during previous NRC pre-load inspection of OPPD, and one new issue
" No safety issues identified
" Inspection still ongoing, with TN and NRC actively working toward a conclusion W7/06 OPPO 21 TN Amendment to CoC 1004
" TN committed to submit a Technical Specification (TS) cleanup amendment before April 2007
" Reformat all TS to Improved TS format
" TS 1.2.1 to be revised to remove any reference to cask or HSM dose rates for fuel qualification (no technical change)
" Basis to be revised to clearly state how the qualification tables are developed BWMfi OPPO 22 11
TN Amendment to CoC 1004 (Continued)
- TS 1.2.7 (HSM Dose Rates) to be removed or clarified:
" Remove reference to detection of misload
" Dose rate limits specified for each system
" Measurement location and configuration will be specified and tied to specific analysis WTM OPPO 23 TN Amendment to CoC 1004 (Continued)
- TS 1.2.11 (Transfer Cask Dose Rates) to be removed or clarified:
" Remove reference to detection of misload
" Dose rate limits specified for each system
- Measurement location and configuration will be specified and tied to specific analysis W7=
OPPO 24 12
TN Amendment to CoC 1004 (Continued)
" TS 1.2.17a to be removed:
" Provide change to operations chapter of the UFSAR requiring use of helium as backfill gas
" Demonstrate no time limit is required for vacuum drying
" Issues addressed by amendment request will depend on outcome of NRC inspection W7/M OPFV 25 Other Options
" Re-rack of spent fuel pool is not feasible
" Any other vendor system would have similar limitations VV'O8 OPPD 25 13
/
Staff Requirements Memo
" Issued August 31, 2006
" FCS exemption is not precedent for similar exemption requests based on insufficient crane capacity
" Generic communications to be issued
" All licensing actions to be processed well in advance of fuel movement
" Inform Commission of insufficient crane capacity WM aPP 27 Summary
- 4 canisters loaded at FCS s Lightweight cask used m Average dose consistent with industry performance m ALARA met
- OPPD prefers to load remaining 6 canisters before 2008 outage W7=~
OPPO 26 14
Summary (continued)
" NRC inspection of TN is in progress
" TN will submit an amendment request before April 2007 to resolve NRC inspection issues WINo 2M Suggested Items for Discussion
" Complexity of TN amendment and review process
" Adequacy of industry guidance for implementing 10 CFR 72.48 contained in NEI 96-07
" Rules of Engagement WOPP 3M 15
Discussion of Timeframes for Decisions 9I7M0 OPPO 31 Identification of Action Items WM'06 OPPO 32 16