High Burnup Data Project

Size: px

Start display at page:

Download "High Burnup Data Project"

Dominic Lloyd
5 years ago
Views:

1 High Burnup Data Project Keith Waldrop Principal Technical Leader Tribal Caucus Midyear Meeting Charlotte, NC January 25, 2017

2 Background For low burnup fuel, sufficient data exist to support licensing Based on demo with low burnup fuel No evidence of degradation after 14 years No visual evidence of additional assembly/cladding degradation or bowing Little to no detachment of crud Still significant creep life left in cladding Provided basis for license renewal for low burnup fuel 2

Background High burnup fuel technical basis from laboratory testing Lab tests show hydrides in clad can reorient though heatup and cooldown during dry storage loading operations Circumferential

3 Background High burnup fuel technical basis from laboratory testing Lab tests show hydrides in clad can reorient though heatup and cooldown during dry storage loading operations Circumferential hydrides (before heatup) Radial hydrides (after heatup/cooldown) Hydride reorientation causes shift in ductile to brittle transition temperature (DBTT) May become brittle at temperatures fuel will reach during storage Loss of ductility is primarily a concern for transport conditions, not storage 3

4 Background Lab data provided basis for loading HBU fuel in dry storage Technical basis provided in US NRC ISG-11 Rev 3 (Nov-2003) Creep will not cause gross rupture until the effects of reorientation are better understood, the hoop stress on the cladding should be controlled to preclude the formation of radially oriented hydrides. Limit hydride reorientation Limit cladding temperature to 400 C to limit hoop stress and soluble hydrogen Limitations of ISG-11 Rev 3 Limited to initial license period (20 yrs) Not applicable to transport 4

Background Why We Need Data From HBU Data Project Limited data on HBU fuel in dry storage Storage licenses for HBU fuel need to be extended Transport licenses for HBU fuel are very limited

5 Background Why We Need Data From HBU Data Project Limited data on HBU fuel in dry storage Storage licenses for HBU fuel need to be extended Transport licenses for HBU fuel are very limited and restricted Data available are from lab testing Need to collect data on HBU fuel real fuel, in a real cask, under real conditions Repeat earlier low burnup demo using high burnup fuel 5

6 High Burnup Data Project Big Picture Load cask with High Burnup fuel Select fuel to provide best scientific data Obtain t=0 data from sister rods (non-destructive and destructive examinations) Instrument cask to acquire data (temperature and gas composition) Use standard industry loading process Collect data After ~10 years in storage: Ship to examination facility Open cask and inspect fuel Examine rods to compare to t=0 Re-close and continue storage and measurements 6

7 Fuel Selection 1 2 (TC Lance) 3 4 6T0 3K7 3T6 6F2 Zirlo, 54.2 GWd M5, 53.4 GWd Zirlo, 54.3 GWd Zirlo, 51.9 GWd 4.25%, 3cy, 11yr 4.55%, 3cy, 8yr 4.25%, 3cy, 11yr 4.25%, 3cy, 13yr 1013/818W 1167/837W 1015/820W 909/756W DRAIN PORT 5 6 (TC Lance) F6 30A 22B 20B 5K6 5D5 Zirlo, 52.1 GWd M5, 52.0 GWd M5, 51.2 GWd M5, 50.5 GWd M5, 53.3 GWd Zirlo, 55.5 GWd 4.25%, 3cy, 13yr 4.55%, 3cy, 6yr 4.55%, 3cy, 5 yr 4.55%, 3cy, 5 yr 4.55%, 3cy, 8yr 4.2%, 3cy, 17yr 914/761W 1276/832W 1503/841W 1477/827W 1163/834W 906/796W 11 Vent P o rt (TC Lance) D9 28B F40 57A 30B 3K4 Zirlo, 54.6 GWd M5, 51.0 GWd Zirc-4, 50.6 GWd M5, 52.2 GWd M5, 50.6 GWd M5, 51.8 GWd 4.2%, 3cy, 17yr 4.55%, 3cy, 5 yr 3.59%, 3cy, 30yr 4.55%, 3cy, 6yr 4.55%, 3cy, 5 yr 4.55%, 3cy, 8 yr 885/778W 1496/837W 699/?W 1281/834W 1482/830W 1120/803W (TC Lance) K7 50B 3U9 0A4* 15B 6K4 M5, 53.3 GWd M5, 50.9 GWd Zirlo, 53.1 GWd Low-Sn Zy-4, 50 GWd M5, 51.0 GWd M5, 51.9 GWd 4.55%, 3cy, 8yr 4.55%, 3cy, 5 yr 4.45%, 3cy, 10yr 4.0%, 2cy, 22yr 4.55%, 3cy, 5 yr 4.55%, 3cy, 8 yr 1165/835W 1492/835W 1037/805W 725/664W 1496/837W 1121/804W (TC Lance) (TC Lance) 3T2 3U4 56B 54B 6V0 3U6 Zirlo, 55.1 GWd Zirlo, 52.9 GWd M5, 51.0 GWd M5, 51.3 GWd M5, 53.5 GWd Zirlo, 53.0 GWd 4.25%, 3cy, 11yr 4.45%, 3cy, 10yr 4.55%, 3cy, 5 yr 4.55%, 3cy, 5 yr 4.4%, 3cy, 8yrs 4.45%, 3cy, 10yr 1036/837W 1031/801W 1495/837W 1511/846W 1178/843W 1035/803W (TC Lance) 32 4V4 5K1 5T9 4F1 High Priority Assys M5, 51.2 GWd M5, 53.0 GWd Zirlo, 54.9 GWd Zirlo, 52.3 GWd 4.40%, 3cy, 8yr 4.55%, 3cy, 8yr 4.25%, 3cy, 11yr 4.25%, 3cy, 13yr 1073/787W 1155/828W 1031/832W 918/764W KEY Location (Thermocouple) Assy ID (high priority) Clad, BU Enr, #cycles, Yrs cooled Decay Heat (loading), (transport) Burnup Clad Type Qty Range Zr low tin Zr Zirlo M

8 Fuel Selection Peak cladding temperatures too low for hydride reorientation Current best estimate using detailed decay heat calculation predicts peak cladding temperature of 271 C Good news story: This is typical of HBU casks, not bounding Hydride reorientation not a concern for most casks considering actual temperatures PNNL plans to do additional analysis for other systems loaded with high heat load Sister rod testing to address gap for higher clad temperatures than in this cask 8

Thermocouples Technical goals: Determine true

thermal models Design considerations: Thermocouple

emplacement (radial and axial) Temperature measurement

9 Thermocouples Technical goals: Determine true temperature distribution Provide benchmark data for thermal models Design considerations: Thermocouple penetrations and confinement Thermocouple lance emplacement (radial and axial) Temperature measurement reliability/longevity Thermocouple calibration Fabrication complete Thermocouple testing 9

10 Gas Sampling Collect gas sample from cask cavity Attach sample bottle to vent port Fission gas, oxygen, hydrogen analyzed in site lab Moisture measured with Moisture Vapor Isotope Analyzer Take gas samples while cask is still in decon building No unmonitored release Dominion can pass leak test after gas sampling Dominion proposed approach for sampling during storage period using temporary enclosure Licensing risk with this approach Not included in initial license amendment 10

11 Sister Rods Extracted 9 AREVA M5 rods from 2 assemblies Extracted 14 Westinghouse rods from 4 assemblies 12 Zirlo, 2 low-tin Zr-4 2 additional Zr-4 rods Rods shipped to ORNL DOE developed draft sister rod test plan Non-destructive testing underway 11

12 Cask Modification Lid machining Initial cask fit-up test Thermocouples Data acquisition system Lid machining Thermocouple testing Data acquisition system Fit-up test 12

High Burnup Data Project Schedule 2017: Complete lid and cask modification and testing Ship cask, lid and instrumentation to North Anna Obtain storage license from NRC (pending NRC review) Perform

13 High Burnup Data Project Schedule 2017: Complete lid and cask modification and testing Ship cask, lid and instrumentation to North Anna Obtain storage license from NRC (pending NRC review) Perform dry runs Load Demonstration Cask and begin temperature and gas data collection Submit amendment for taking gas samples at the ISFSI Complete non-destructive examinations of sister rods Complete test plan for destructive sister rod testing Begin destructive examinations of sister rods 13

High Burnup Data Project Schedule (con t) 2018 - ~2027: Obtain storage license amendment from NRC for gas sampling at pad Continue taking periodic temperature

14 High Burnup Data Project Schedule (con t) ~2027: Obtain storage license amendment from NRC for gas sampling at pad Continue taking periodic temperature measurements Continue taking periodic gas samples at pad Submit and obtain transportation Certificate of Compliance (CoC) from NRC (tentative, pending NRC review) 14

15 High Burnup Data Project Schedule (con t) ~2027 Return Demonstration Cask to the North Anna Power Station Prepare cask for transport to an off-site Fuel Examination Facility Ship cask to a Fuel Examination Facility (to be provided by DOE) Open cask and visually examine the fuel Extract high burnup rods for subsequent examination Conduct non-destructive and destructive examinations of the rods at the national lab(s) Same exams as t=0 exams Compare end-of-storage and t=0 fuel properties Re-close cask and continue storage; re-open again later 15

16 Together Shaping the Future of Electricity 16

High Burnup Dry Storage Cask Research and Development Project. Final Test Plan. Prepared by: the Electric Power Research Institute REVISION LOG

High Burnup Dry Storage Cask Research and Development Project Final Test Plan Prepared by: the Electric Power Research Institute REVISION LOG Rev. Date Affected Pages Revision Description 0 February 27,