ML15133A082

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ISFSI Presentation Slides - TN-32 High Burnup Dry Storage Research Project, May 13, 2015 (Tom Brookmire)
ML15133A082
Person / Time
Site: North Anna  Dominion icon.png
Issue date: 05/13/2015
From: Brookmire T
Dominion, Virginia Electric & Power Co (VEPCO)
To: Janice Nguyen
Spent Fuel Licensing Branch
Nguyen J
References
Download: ML15133A082 (24)
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Text

North Anna ISFSI TN-32 High Burnup Dry Storage Research Project Tom Brookmire May 13, 2015

Agenda g

  • Background
  • Fuel Selection Update & Project Milestones
  • HBU Cask Specifics & Confinement
  • License Changes
  • In Situ Gas Sampling

North Anna ISFSI Research Project

Background

Storage of a TN-32 cask with high burnup fuel Referred to as the TN-32 HBU Cask North Anna ISFSI Cask monitoring to provide valuable data for storage of high burnup fuel

(>45,000 MWd/MtU)

High Burnup Dry Storage Research Project - May 13, 2015 3

North Anna ISFSI Research Project Finalized Fuel Selection Initial I iti l enrichment i h t ranges fromf 3.59 3 59 w/o / tot 4.55 4 55 w/o /

Average assembly burnup ranges from 50.0 GWd/MtU to 55.5 GWd/MtU As of July 1, 2017 Payload heat load is just under 37 kW Decay times range from 5.31 years to 30.2 years Assembly decay heat values range from 696 Watts to 1511 Watts Average assembly decay heat is 1155 Watts Peak cladding best estimate temperatures during drying expected to be approximately 340 °C C High Burnup Dry Storage Research Project - May 13, 2015 4

North Anna ISFSI Research Project Design Loading Plan 1 2 (TC Lance) 3 4 Zirlo M5 Zirlo Zirlo 54.2 GWd/MtU 53.4 GWd/MtU 54.3 GWd/MtU 51.9 GWd/MtU 4.25%, 3cy, 11yr 4.55%, 3cy, 8yr 4.25%, 3cy, 11yr 4.25%, 3cy, 13yr 1013 W 1167 W 1015 W 909 W 5 6 (TC Lance) 7 8 9 10 Zirlo M5 M5 M5 M5 Zirlo 52.1 GWd/MtU 52.0 GWd/MtU 51.2 GWd/MtU 50.5 GWd/MtU 53.3 GWd/MtU 55.5 GWd/MtU 4 25% 3cy 4.25%, 3cy, 13yr 4 55% 3cy 4.55%, 3cy, 6yr 4 55% 3cy 4.55%, 3cy, 5 yr 4 55% 3cy 4.55%, 3cy, 5 yr 4 55% 3cy 4.55%, 3cy, 8yr 4 2% 3cy 4.2%, 3cy, 17yr 914 W 1276 W 1503 W 1477 W 1163 W 906 W 11 12 13 14 (TC Lance) 15 16 Zirlo M5 Zirc-4 M5 M5 M5 54.6 GWd/MtU 51.0 GWd/MtU 50.6 GWd/MtU 52.2 GWd/MtU 50.6 GWd/MtU 51.8 GWd/MtU 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 W 1496 W 696 W 1281 W 1482 W 1120 W 17 18 19 (TC Lance)

L ) 20 21 22 M5 M5 Zirlo Low-Sn Zirc-4 M5 M5 53.3 GWd/MtU 50.9 GWd/MtU 53.1 GWd/MtU 50 GWd/MtU 51.0 GWd/MtU 51.9 GWd/MtU 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 W 1492 W 1037 W 725 W 1496 W 1121 W 23 24 (TC Lance) 25 26 27 28 (TC Lance)

Zirlo Zirlo M5 M5 M5 Zirlo 55.1 GWd/MtU 52.9 GWd/MtU 51.0 GWd/MtU 51.3 GWd/MtU 53.5 GWd/MtU 53.0 GWd/MtU 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 W 1031 W 1495 W 1511 W 1178 W 1035 W 29 30 31 (TC Lance) 32 M5 M5 Zirlo Zirlo 51.2 GWd/MtU 53.0 GWd/MtU 54.9 GWd/MtU 52.3 GWd/MtU 4.40%,, 3cy, y, 8yr y 4.55%,, 3cy, y, 8yr y 4.25%,, 3cy, y, 11yr y 4.25%,, 3cy, y, 13yr y

1073 W 1155 W 1031 W 918 W High Burnup Dry Storage Research Project - May 13, 2015 5

North Anna ISFSI Research Project Milestone Schedule 6/15: Completion of sister rod retrieval 7/31/15: Dominion submits LAR to NRC 1Q16: Sister rods shipped to laboratory 1/31/17: Target for NRC review completion 6/30/17: Dry run and functional tests complete 7/31/17: Cask loading complete - begin thermal soak period 8/21/17: Cask emplaced p at ISFSI pad p High Burnup Dry Storage Research Project - May 13, 2015 6

North Anna ISFSI Research Project TN-32 HBU Cask Specifics No significant changes to the cask body or basket are anticipated TN-32B-81 (original nameplate) cask fabricated and certificate of conformance issued by Areva TN Nameplate will be modified Cask exterior will be recoated No changes will be made to the pressure monitoring system, pressure switches, or alarm hookups The pressure monitoring system will monitor additional thermocouple lance penetrations High Burnup Dry Storage Research Project - May 13, 2015 7

North Anna ISFSI Research Project TN-32 HBU Cask Specifics Physical changes to the TN-32 HBU Cask include:

Seven thermocouple ports will be added to the lid Confinement maintained by dual metallic seals very similar to the port cover dual metallic seals described in the original TN-32 FSAR Additional helium lines will be used to connect the thermocouple port seals to the Overpressure System (OP) for seal integrity monitoring Top neutron shield elevated approximately one inch to provide space for thermocouple wiring and OP system tubing An additional handhand-way way will be added to the Protective Cover (environmental cover) to permit access to the vent port for subsequent gas sampling at the pad Upgraded lid closure bolt connections High Burnup Dry Storage Research Project - May 13, 2015 8

North Anna ISFSI Research Project TN-32 HBU Cask Specifics Confinement boundary Maintained from original TN-32 design, with the following additions:

Thermocouple sleeve inserts, head, and lance Thermocouple is based on the design used in B&W reactors Dual seal configuration with same Tech Spec monitoring equipment - connected at the ISFSI pad High Burnup Dry Storage Research Project - May 13, 2015 9

North Anna ISFSI Research Project TC Lance Confinement Boundary High Burnup Dry Storage Research Project - May 13, 2015 10

North Anna ISFSI Research Project TN-32 HBU Cask Specifics Additional materials included in the design Thermocouple/fuel p assembly y interface g guides Neutron absorber rods for future transport considerations Similar to absorber assemblies used during operation High Burnup Dry Storage Research Project - May 13, 2015 11

North Anna ISFSI Research Project TN-32 HBU Cask Specifics TN-32B HBU cask fabricated to CoC 72-1021 requirements Not initially licensed for high burnup fuel Seek to amend North Annas site specific ISFSI license SNM-2507 for TN-32 storage casks to add the HBU Cask High Burnup Dry Storage Research Project - May 13, 2015 12

North Anna ISFSI Research Project License Changes Requested changes to the license will include:

Allowable fuel parameters

  • Initial Enrichment 4.60 wt. % (Areva Advanced Mark BW) 3.64 wt. % (Westinghouse Standard) 4 50 wt.

4.50 wt % (Westinghouse Vantage 5H)

  • Average Burnup 60 GWD/MTU
  • Minimum Cooling Time 5 years
  • Decay Heat 36.96 36 96 kW
  • Fuel Assembly Designs Areva Advanced Mark BW Westinghouse Standard Westinghouse Vantage 5H High Burnup Dry Storage Research Project - May 13, 2015 13

North Anna ISFSI Research Project License Changes Requested changes to the license will include:

Allowable fuel parameters

  • Fuel Assembly Inserts Unirradiated Poison Rod Assemblies (six total)
  • Fuel Assembly Weight, Including PRAs 1551 pounds
  • Fuel Assembly Initial Uranium Content 469.0 kgU/assembly High Burnup Dry Storage Research Project - May 13, 2015 14

North Anna ISFSI Research Project License Changes Requested changes to the license will include:

Changes to LCOs A surveillance will be added to LCO 3.1.2 3 1 2 for SSSC seal integrity to allow for cavity testing during Loading Operations (extended period of time before final closure - thermal soak period)

Frequency period for LCO 3.1.3 moved to Table 3 3-1 1 to allow for cavity testing during Loading Operations No change to the limits in Table 3-1 for existing TN-32 design Surface dose rates for the top of the cask will increaseincrease, but no change to the side surface dose rate is necessary Additional minor changes needed to account for the use of the TN-32 HBU Cask High Burnup Dry Storage Research Project - May 13, 2015 15

North Anna ISFSI Research Project Design Basis A Design and Licensing Basis Document (DLBD) will be submitted with the License Amendment Request (LAR) (proprietary submittal)

The DLBD will provide the analytical bases and conclusions for departures from the existing approved analyses in the TN-32 TN 32 FSAR For example:

Criticality safety analysis, higher enrichment Thermal safety analysis, higher heat loading Shielding analysis, higher source term High Burnup Dry Storage Research Project - May 13, 2015 16

North Anna ISFSI Research Project In Situ Cavity Gas Sampling Method Install scaffold building over cask, remove vent port cover, fill gas sample bottles, analyze contents Vent p port cover will be reseated using g same seal design g as the original g

(i.e., bolts, lubricant, torque technique, and o-ring will be same design)

Planned frequency Once before 2020 (target 1 year after loading)

Once ~ 3 years after first sample Once prior to transport Basis Aligns with station resource requirements and ALARA principles Supports industry license renewal timing needs High Burnup Dry Storage Research Project - May 13, 2015 17

North Anna ISFSI Research Project I Situ In Sit Cavity C it Gas G Sampling S li - Licensing Li i SNM SNM-2507 2507 license does not describe in situ cavity gas sampling Confinement integrity g y assured by y Tech Spec p leak rate verification and continuous seal monitoring via overpressure system However However, cannot verify original Tech Spec leak rate criterion is met after vent port cover is replaced In situ cavity gas sampling will be addressed in a separate licensing action following LAR submittal High Burnup Dry Storage Confirmatory Data Project - May 13, 2015 18

North Anna ISFSI Research Project Questions?

High Burnup Dry Storage Research Project - May 13, 2015 19

North Anna ISFSI SNM-2507 License Renewal Rich Ridder May 13, 2015

North Anna ISFSI License Renewal Plan Site-Specific License SNM-2507 expires June 2018 Li License Renewal R l (LR) application li ti scheduled h d l d for f

submittal April 2016 Includes the TN-32 TN 32 casks presently on Pad 1 NUREG-1927 Rev. 0, use expanded guidance (draft) from Rev. 1 Aging Management guidance from NEI 14-03 TLAAs 40 year renewal period 2016 LR application will not contain information about the HBU Cask High Burnup Dry Storage Research Project - May 13, 2015 21

North Anna ISFSI License Renewal Application and LAR Timing HBU C Cask kA Activities ti iti Submit License HBU Cask placed at LAR review Amendment Request North Anna ISFSI complete p

f HBU Caskk for Pad 1 April 2016 Spring 2017 June 2018 July 2015 January 2017 August 2017 Submit SNM-2507 Submit supplement Scheduled License Renewal to LR application with HBU completion of LR application Cask information application review License Renewal Activities High Burnup Dry Storage Research Project - May 13, 2015 22

North Anna ISFSI License Renewal Plan - Summary License Amendment Request for the HBU Cask to be submitted July 2015, prior to the ISFSI License Renewal application in 2016 Needed N d d to t supportt HBU C Cask k lloading di schedule h d l Submittal letter for the License Amendment Request will explain the plan for the License Renewal application Inclusion of HBU Cask information in a Supplement to the LR application once LAR review is completed HBU Cask is planned to be loaded and placed at the ISFSI during the License Renewal application review period High Burnup Dry Storage Research Project - May 13, 2015 23

North Anna ISFSI License Renewal Questions?

High Burnup Dry Storage Research Project - May 13, 2015 24

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