ML17265A809
| ML17265A809 | |
| Person / Time | |
|---|---|
| Site: | Watts Bar  |
| Issue date: | 09/26/2017 |
| From: | Burzynski M, Robert Schaaf Tennessee Valley Authority |
| To: | Andrew Hon Plant Licensing Branch II |
| Hon A | |
| References | |
| Download: ML17265A809 (24) | |
Text
Watts Bar Unit 2 Tritium Production License Amendment Pre-Application Meeting Mark Burzynski September 26, 2017
Agenda Purpose Introduction and Background Project Scope Licensing Amendment Request Technical Specification Changes Interface Items with New Analyses Licensing Schedule Closing l 2 Tritium Production License Amendment Pre-Application Meeting l September 26, 2017
Purpose Pre-submittal meeting to describe the Unit 2 license amendment request (LAR) to authorize tritium production Summarize LAR content and key results Explain where the Unit 2 LAR differs from the Unit 1 precedents Identify key schedule milestones to support Department of Energy (DOE) National Nuclear Security Administration (NNSA) production requirements PLACE THE TITLE OF THE PRESENTATION HERE l 3
Introduction and Background (1/3)
Tritium Production Program Watts Bar Unit 1 tritium production began in October 2003 DOE-NNSA identified need to expand production, which requires a second reactor In December 2015, DOE-NNSA notified TVA of future tritium needs In June 2016, TVA agreed to assess potential for tritium production for Watts Bar Unit 2 l 4 Tritium Production License Amendment Pre-Application Meeting l September 26, 2017
Introduction and Background (2/3)
Watts Bar tritium production target Steady ramp-up of tritium production to approximately 2800 grams every 18 months by December 2025 July 2016 Unit 1 license amendment authorized 1792 TPBAR production September 13, 2016 planning meeting held with NRC to discuss Unit 2 TPBAR production l 5 Tritium Production License Amendment Pre-Application Meeting l September 26, 2017
Introduction and Background (3/3)
Unit 2 LAR to be submitted in December 2017 with requested approval by May 31, 2019 Approval needed to support tritium production beginning in Unit 2 Cycle 4 (currently scheduled for November 2020) l 6 Tritium Production License Amendment Pre-Application Meeting l September 26, 2017
Project Scope (1/2)
Plant Modifications Replacing seven CCS and ERCW relief valves to address post-LOCA subcriticality margin Increasing the required minimum dilution flowrate setpoint during radioactive effluent releases from 20,000 gpm to 30,000 gpm Reverse osmosis unit Impact on liquid radioactive effluents determined not to be required for 10 CFR Part 20 compliance Adding to Liquid Radwaste System to provide additional operational capabilities for effluent management l 7 Tritium Production License Amendment Pre-Application Meeting l September 26, 2017
Project Scope (2/2)
TVA Engineering Documentation Westinghouse analyses PNNL engineering documentation Holtec analyses S&L revisions to affected dose calculations, FSAR, and System Descriptions LAR to operate with 1792 TPBARs at Watts Bar Unit 2 l 8 Tritium Production License Amendment Pre-Application Meeting l September 26, 2017
License Amendment Request (1/3)
Watts Bar Unit 2 LAR for tritium production based on Watts Bar Unit 1 precedents Addresses 17 plant-specific interface items from NUREG 1672 Safety Evaluation Report for DOE Tritium Production Core Topical Report Addresses post-LOCA subcriticality for lithium leaching effects Updates information for two-unit tritium production for environmental assessment Effect on thermal conductivity degradation would be treated in same manner as for Unit 1 PAD4TCD licensing issue for Unit 2 License Condition would not be coupled with Unit 2 TPBAR LAR l 9 Tritium Production License Amendment Pre-Application Meeting l September 26, 2017
License Amendment Request (2/3)
Watts Bar Unit 2 LAR for tritium production addresses lessons learned from emergent industry issues Interface Item #4 includes new reactor vessel fluence evaluations that address issues documented in RIS 2014-11 Interface Item #10 includes results of new spent fuel rack criticality analyses that uses the latest version of NEI 12-16 l 10 Tritium Production License Amendment Pre-Application Meeting l September 26, 2017
License Amendment Request (3/3)
Watts Bar Unit 2 LAR for tritium production addresses lessons learned from the NRC review of the Unit 1 application and the Unit 2 LAR preparation Interface Item #5 includes results of new accident analyses updated to bound the use of original and replacement steam generators and updated primary and secondary radionuclide concentrations Interface Item #14 includes results of new radioactive effluent assessments that address effects of two unit tritium production on radioactive effluent management l 11 Tritium Production License Amendment Pre-Application Meeting l September 26, 2017
Technical Specification Changes (1/3)
Proposed change revises the Unit 2 Technical Specification (TS) 4.2.1, "Fuel Assemblies," to add a limit on the number of Tritium Producing Burnable Absorber Rods (TPBARs) that can be irradiated Change is analogous to changes implemented in Watts Bar Unit 1 l 12 Tritium Production License Amendment Pre-Application Meeting l September 26, 2017
Technical Specification Changes (2/3)
Proposed change revises the Units 1 and 2 TSs affected by the new spent fuel rack criticality analysis TS 3.7.15, Spent Fuel Assembly Storage, revised to simplify the fuel storage limitations on fuel assemblies by eliminating burnup-related criteria TS 3.7.18, Fuel Storage Pool Boron Concentration, added to specify minimum fuel storage pool boron concentration when fuel is stored in the pool TS 3.9.9, Spent Fuel Pool Boron Concentration, revised to modify the minimum fuel storage pool boron concentration during refueling operations when fuel is stored in the pool l 13 Tritium Production License Amendment Pre-Application Meeting l September 26, 2017
Technical Specification Changes (3/3)
Proposed change revises the Units 1 and 2 TSs affected by the new spent fuel rack criticality analysis (continued)
TS 4.3, Fuel Storage, revised to replace the storage limitations on fuel assembly initial enrichment, burnup, and storage location limitations with a single requirement to maintain a specified boron concentration in the spent fuel pool TS 5.7.2.21, Spent Fuel Storage Rack Neutron Absorber Monitoring Program, added to incorporate the NRC-approved NEI 16-03-A guidance l 14 Tritium Production License Amendment Pre-Application Meeting l September 26, 2017
Interface Item #4 - Reactor Vessel Integrity New heatup and cooldown P-T limit curves generated using limiting Adjusted Reference Temperature values for WBN Unit 2 P-T limit curves generated for 32 effective full-power years using the KIc methodology detailed in the 1998 through the 2000 Addenda Edition of the ASME Code,Section XI, Appendix G Methodology is consistent with the NRC-approved methodology documented in WCAP-14040-A, Revision 4.
l 15 Tritium Production License Amendment Pre-Application Meeting l September 26, 2017
Interface Item #5 - Control Room Dose Analyses Main steam line break and steam generator tube rupture analyses updated Bounds use of original and replacement steam generators Correct some errors affecting primary and secondary radionuclide concentrations Tritium assumptions remain the same as for Watts Bar Unit 1 Dose results remain well within 10 CFR Part 100 and 10 CFR Part 50 Appendix A GDC 19 dose limits.
l 16 Tritium Production License Amendment Pre-Application Meeting l September 26, 2017
Interface Item #10 - Fuel Rack Criticality Analyses (1/2)
Watts Bar spent fuel pool contains a single type of BORALTM racks with flux traps designed for storage of pressurized water reactor fuel.
Criticality control in the BORALTM storage racks rely on the following:
Fixed neutron absorbers: BORALTM panels Storage cell spacing, i.e., flux traps between storage cells Soluble boron l 17 Tritium Production License Amendment Pre-Application Meeting l September 26, 2017
Interface Item #10 - Fuel Rack Criticality Analyses (2/2)
Criticality calculations qualify the BORALTM storage racks uniformly loaded with fresh fuel assemblies with an initial enrichment up to 5 weight percent 235U Bounding fuel density of all types of fuel assemblies is considered Bounding approach provides analysis simplicity and adequate margin Neutron absorber monitoring program, will be implemented following the NRC-approved guidance in NEI 16-03-A l 18 Tritium Production License Amendment Pre-Application Meeting l September 26, 2017
Interface Item #14 - Radioactive Liquid Effluents (1/4)
New analysis of liquid and gaseous radioactive effluents performed:
Included effects of tritium production in Watts Bar Units 1 and 2 Updated primary and secondary radionuclide concentrations Minimum dilution flow required for discharge of radioactivity into the Cooling Tower Blowdown lines increased from 20,000 gpm to 30,000 gpm Results demonstrate that both 10 CFR Part 20 effluent concentration limit values and 10 CFR Part 50 Appendix I dose limits are met l 19 Tritium Production License Amendment Pre-Application Meeting l September 26, 2017
Interface Item #14 - Radioactive Liquid Effluents (2/4) l 20 Liquid Release, Mobile Demineralizer Processing Dual Unit Operation Design C/ECL Total (no TPC) 5.65E-01 Total (with TPC) 8.35E-01 Liquid Release, Direct SGBD Release at Maximum Appendix I Dual Unit Operation Design C/ECL Total (no TPC) 5.79E-01 Total (with TPC) 8.47E-01 Tritium Production License Amendment Pre-Application Meeting l September 26, 2017
Interface Item #14 - Radioactive Liquid Effluents (3/4) l 21 Annual Radioactive Liquid Emissions Non-TPC Dose TPC Dose Incremental Increase from TPC NRC Annual Effluent Exposure Guideline Maximally Exposed Individual (mrem) Total Body 0.34 0.37 0.03 3.00 Total Body Maximally Exposed Individual (mrem) Organ 0.47 (Liver) 0.49 (Liver) 0.02 10.00 Any Organ 50-mile Population Dose (person-rem) 6.9 (Thyroid) 11.0 (Thyroid) 4.1 NA Tritium Production License Amendment Pre-Application Meeting l September 26, 2017
Interface Item #14 - Radioactive Liquid Effluents (4/4) l 22 Annual Radioactive Gaseous Emissions Non-TPC Dose TPC Dose Incremental Increase from TPC NRC Annual Effluent Exposure Guideline Maximally Exposed Individual (mrem) Total Body 0.63 0.63 0
5.00 Total Body Maximally Exposed Individual (mrem) Organ 11.9 (Bone) 12.7 (Bone) 0.8 15.00 Any Organ 50-mile Population Dose (person-rem) 16.0 (Thyroid) 21.4 (Thyroid) 5.4 NA Tritium Production License Amendment Pre-Application Meeting l September 26, 2017
Licensing Schedule l 23 Tritium Production License Amendment Pre-Application Meeting l September 26, 2017
Closing LAR is scheduled to be submitted in December 2017 requesting approval to operate with 1792 TPBARs at Watts Bar Unit 2 Based on DOE need to expand tritium production Watts Bar Unit 2 LAR for tritium production based on Watts Bar Unit 1 precedents Includes new analyses to address lessons learned from emergent industry issues and NRC review of the Unit 1 application to simplify NRC review TVA requests approval of the proposed License Amendment by May 31, 2019, to support TPBAR irradiation starting in Watts Bar Unit 2 Cycle 4 l 24 Tritium Production License Amendment Pre-Application Meeting l September 26, 2017