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| REQUEST FOR ADDITIONAL INFORMATION AMENDMENT REQUEST REGARDING UTILIZATION OF TVEL TVS-K LEAD TEST ASSEMBLIES EXELON GENERATION COMPANY, LLC BRAIDWOOD STATION, UNITS 1 AND 2 DOCKET NOS. 50-456 AND 50-457 Proprietary information pursuant to Title 10 of the Code of Federal Regulations Section 2.390 has been redacted from this document. | | REQUEST FOR ADDITIONAL INFORMATION AMENDMENT REQUEST REGARDING UTILIZATION OF TVEL TVS-K LEAD TEST ASSEMBLIES EXELON GENERATION COMPANY, LLC BRAIDWOOD STATION, UNITS 1 AND 2 DOCKET NOS. 50-456 AND 50-457 Proprietary information pursuant to Title 10 of the Code of Federal Regulations Section 2.390 has been redacted from this document. |
| Redacted information is identified by blank space enclosed within double brackets as shown here [[ ]]. | | Redacted information is identified by blank space enclosed within double brackets as shown here (( )). |
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| REQUEST FOR ADDITIONAL INFORMATION AMENDMENT REQUEST REGARDING UTILIZATION OF TVEL TVS-K LEAD TEST ASSEMBLIES EXELON GENERATION COMPANY, LLC BRAIDWOOD STATION, UNITS 1 AND 2 DOCKET NOS. 50-456 AND 50-457 | | REQUEST FOR ADDITIONAL INFORMATION AMENDMENT REQUEST REGARDING UTILIZATION OF TVEL TVS-K LEAD TEST ASSEMBLIES EXELON GENERATION COMPANY, LLC BRAIDWOOD STATION, UNITS 1 AND 2 DOCKET NOS. 50-456 AND 50-457 |
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| ]] and address DNB propagation during accident conditions. Discuss how the updates will be validated against relevant measurements from experiments or post-irradiation examination.}}
| | )) and address DNB propagation during accident conditions. Discuss how the updates will be validated against relevant measurements from experiments or post-irradiation examination.}} |
Latest revision as of 21:38, 16 March 2020
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Category:Request for Additional Information (RAI)
MONTHYEARML24263A1272024-09-23023 September 2024 – Request for Additional Information (EPID 2023-LLA-0136) - Non-Proprietary ML24197A0162024-07-12012 July 2024 NRR E-mail Capture - Final RAI - Constellation Energy Generation, LLC - Fleet Request - License Amendment Request to Adopt TSTF-591 ML24142A3352024-05-21021 May 2024 Quad Cities—Information Request to Support the NRC Annual Baseline Emergency Action Level and Emergency Plan Changes ML24053A3382024-02-22022 February 2024 NRR E-mail Capture - Final RAI - Constellation Energy Generation, LLC - Fleet Request - Proposed Alternative for Examination of Pressurizer Circumferential and Longitudinal Shell-to-Head Welds and Nozzle-to-Vessel Welds (L-2023-LLR-0062) ML24039A0412024-01-30030 January 2024 NRR E-mail Capture - Request for Additional Information Regarding Braidwood Request for Alternative (I4R-18) ML23339A0452023-12-0505 December 2023 Request for Information for an NRC Post-Approval Site Inspection for License Renewal Inspection Report 05000546/2024010 ML23191A8442023-07-10010 July 2023 05000456; 05000457 Notification of an NRC Biennial Licensed Operator Requalification Program Inspection and Request for Information ML23110A3202023-04-21021 April 2023 Information Request to Support the NRC Annual Baseline Emergency Action Level and Emergency Plan Changes Inspection ML23094A1352023-04-0404 April 2023 Request for Information for Nrc Commercial Grade Dedication Inspection Inspection Report 05000456/2023010 05000457/2023010 ML23069A0342023-03-0606 March 2023 Unit 1 Lr Commitment 10 RAI Set 1 - (Non-Proprietary) ML23069A0332023-03-0606 March 2023 Email to K. Lueshen Byron and Braidwood Commitment 10 - Request for Additional Information Set 1 ML23018A1632023-01-18018 January 2023 Notification of NRC Baseline Inspection and Request for Information ML22241A0522022-08-29029 August 2022 Notification of NRC Baseline Inspection and Request for Information Inspection Report 05000456/2022004 05000457/2022004 ML22129A0132022-05-0606 May 2022 NRR E-mail Capture - Draft RAIs for Requests for Alternatives I4R-17, I4R-23, ISI-05-018, I6R-10 ML22271A0772022-05-0606 May 2022 NRR E-mail Capture - Final RAIs 9.1.2021 Constellation Relief Request ML22091A0852022-04-0101 April 2022 NRR E-mail Capture - Braidwood and Byron - Final RAI Regarding Proposed Alternative for Various Pressurizer Welds (EPID L-2021-LLR-0035 and 0036) ML22041B5362022-02-10010 February 2022 NRR E-mail Capture - Constellation Energy Generation, LLC - Request for Additional Information Regarding Fleet License Amendment Request to Adopt TSTF-541 ML22034A9862022-02-0404 February 2022 Information Request for the Cyber-Security Baseline Inspection, Notification to Perform Inspection 05000456/2022402 05000457/2022402 ML21350A4372021-12-16016 December 2021 Request for Information for an NRC Triennial Baseline Design Bases Assurance Inspection (Team) Inspection Report 05000456/2022010 and 05000457/2022010 ML21256A1902021-09-10010 September 2021 NRR E-mail Capture - Exelon Generation Company, LLC - Request for Additional Information Regarding License Transfer Application ML21228A2352021-08-17017 August 2021 Notification of NRC Baseline Inspection and Request for Information Inspection Report 05000457/2021004 ML21193A0942021-07-12012 July 2021 Notification of an NRC Biennial Licensed Operator Requalification Program Inspection and Request for Information ML21189A1602021-07-0808 July 2021 NRR E-mail Capture - Request for Additional Information - Braidwood, Byron, and Ginna - Amendment to Address the Issues in Westinghouse NSALs ML21144A2132021-05-24024 May 2021 NRR E-mail Capture - Exelon Generation Company, LLC - Request for Additional Information Regarding License Transfer Application ML21117A0342021-05-0505 May 2021 Request for Additional Information Regarding Proposed Alternative to Use ASME Code Case N-893 ML21062A0652021-03-0101 March 2021 NRR E-mail Capture - Exelon Generation Company, LLC - Request for Additional Information Regarding Proposed Fleet Alternative to Documentation Requirements for Pressure Retaining Bolting ML21057A1022021-02-25025 February 2021 Notification of NRC Fire Protection Team Inspection Request for Information; Inspection Report 05000456/2021010; 05000457/2021010 ML21049A2572021-02-18018 February 2021 Request for Additional Information Byron/Dresden Proposed Changes to Site Emergency Plans to Support Post-Shutdown and Permanently Defueled Conditions (EPID-2020-LLA-0240 & EPID-2020-LLA-0237) ML21029A3302021-01-29029 January 2021 NRR E-mail Capture - Exelon Generation Company, LLC - Request for Additional Information Regarding Fleet Alternative Request to Use ASME Code Case N-885 ML21020A1292021-01-20020 January 2021 Notification of NRC Baseline Inspection and Request for Information; Inspection Report 05000456/2021002; 05000457/2021002 ML21004A1452020-12-30030 December 2020 NRR E-mail Capture - Request for Additional Information Regarding Relief Requests Braidwood I4R-11 and Byron I4R-18 ML20289A1142020-10-0909 October 2020 NRR E-mail Capture - Preliminary RAIs for LAR Regarding Non-conservative TS EDG Frequency Tolerance ML20153A7042020-06-0101 June 2020 NRR E-mail Capture - Preliminary RAI for Fleet Request to Use Alternative OMN-26 ML20104C1452020-04-10010 April 2020 NRR E-mail Capture - Preliminary RAIs for Exelon'S April 6, 2020, Application to Defer Braidwood, Unit 2, Steam Generator Inspections ML20023A0812020-01-23023 January 2020 NRR E-mail Capture - RAIs for L-2019-LLA-0201 - Braidwood, Units 1 and 2, LAR to Revise TS 3.7.9, Ultimate Heat Sink ML19350B2952019-12-16016 December 2019 NRR E-mail Capture - Draft Request for Additional Information Regarding Braidwood Station, Units 1 and 2, Impractical Inservice Inspection Requirements (L-2019-LLA-0081) ML19275H1362019-10-0202 October 2019 NRR E-mail Capture - Exelon Generation Company, LLC - Request for Additional Information Regarding Request to Use ASME Code Case N-879 ML19252C1542019-08-22022 August 2019 NRR E-mail Capture - Issuance of the Remainder of Preliminary RAIs for Braidwood/Byron TSTF-505 Application ML19232A2242019-08-0707 August 2019 NRR E-mail Capture - Partial Issuance of Final RAIs for Braidwood/Byron TSTF-505 Application ML19207A0672019-07-26026 July 2019 NRR E-mail Capture - Partial Issuance of Preliminary RAIs for Braidwood/Byron TSTF-505 Application ML19179A0612019-07-19019 July 2019 Three Mile Point 1 - Supplemental Information Needed to Proposed Alternative to Use ASME Code Case N-879 ML19128A2362019-05-0202 May 2019 NON- PROPRIETARY- Request for Additional Information- Amendment Request Regarding Utilization of Tvel TVS-K Lead Test Assemblies Braidwood Station, Units 1 and 2 ML19066A0432019-03-0707 March 2019 NRR E-mail Capture - Preliminary RAIs for Quality Assurance Review of Braidwood Tvel LTA Application ML18324A8072018-12-12012 December 2018 Supplemental Information Needed for Acceptance of Requested Licensing Action One-Time Extension of Technical Specification 3.8.1, AC Sources-Operating, A2 Completion Time ML18192C1712018-07-11011 July 2018 NRR E-mail Capture - Preliminary Request for Additional Information Regarding Braidwood Station, Units 1 and 2, Relief Request IR4-03 ML18190A4072018-07-0505 July 2018 NRR E-mail Capture - Preliminary Request for Additional Information Regarding Braidwood Station, Units 1 and 2, Relief Request IR4-06 ML18150A6902018-05-30030 May 2018 NRR E-mail Capture - Preliminary RAIs Regarding Braidwood TORMIS Amendment Request ML18149A2842018-05-24024 May 2018 NRR E-mail Capture - B/B 50.69 RAI - Potential Typo ML18135A2202018-05-15015 May 2018 NRR E-mail Capture - Preliminary RAIs for Braidwood Relief Request IR4-05 ML18129A1082018-05-0909 May 2018 NRR E-mail Capture - Preliminary RAIs for Braidwood and Byron Stations 50.69 Amendment 2024-09-23
[Table view] |
Text
ENCLOSURE 1 (NON-PROPRIETARY)
REQUEST FOR ADDITIONAL INFORMATION AMENDMENT REQUEST REGARDING UTILIZATION OF TVEL TVS-K LEAD TEST ASSEMBLIES EXELON GENERATION COMPANY, LLC BRAIDWOOD STATION, UNITS 1 AND 2 DOCKET NOS. 50-456 AND 50-457 Proprietary information pursuant to Title 10 of the Code of Federal Regulations Section 2.390 has been redacted from this document.
Redacted information is identified by blank space enclosed within double brackets as shown here (( )).
REQUEST FOR ADDITIONAL INFORMATION AMENDMENT REQUEST REGARDING UTILIZATION OF TVEL TVS-K LEAD TEST ASSEMBLIES EXELON GENERATION COMPANY, LLC BRAIDWOOD STATION, UNITS 1 AND 2 DOCKET NOS. 50-456 AND 50-457
- 1. In its letter dated July 19, 2018 (Agencywide Documents Access and Management System (ADAMS) Accession No. ML18204A169), Exelon discussed power margin calculations that were performed to determine the cutback in the enthalpy rise hot channel factor (FH) needed to ensure the requested TVS-K lead test assemblies (LTAs) will not be limiting with respect to critical heat flux (CHF) during anticipated operational occurrences (AOOs) and normal operation. The letter stated that the power margin calculations used the CRK CHF correlation, which was developed by TVEL specifically for TVS-K fuel. By letter dated October 19, 2018 (ADAMS Accession No. ML18296A288), Exelon provided additional information on the CRK correlation and its development.
In its letter dated July 19, 2018, Exelon also stated that the prior LTA experience at the Ringhals 3 nuclear power plant in Sweden prompted changes to the TVS-K LTA design for Braidwood. One of the listed changes includes a new mixing vane next to the guide thimble to improve flow mixing. During its audit, the NRC staff learned that the CRK correlation was developed based on CHF testing performed prior to the spacer grid changes made for the Braidwood LTAs. Since changes to the spacer grid configuration can substantially affect the thermal-hydraulic performance of a fuel assembly, the NRC staff requests the following information to ensure the adequacy of the assembly power cutback calculations.
Provide a more detailed description of the spacer grid updates that were made for the TVS-K lead LTAs proposed for use at Braidwood relative to the spacer grids irradiated in TVS-K LTAs at Ringhals and tested to support development of the CRK CHF correlation. Discuss any additional testing that may have been done to validate that the CRK correlation provided adequate or conservative predictions of CHF for the updated spacer grid. If new CHF testing using the updated spacer grids was performed at a facility other than those already discussed in letters dated July 19 and October 19, 2018, provide a description of the test facility consistent with the level of detail provided for the two facilities already described.
- 2. The NRC staffs initial look at the qualification and validation of PRIME models for the TVEL LTAs and the Braidwood fuel rod thermal mechanical evaluation reveals sufficient information to demonstrate acceptable results for the first cycle. However, information is currently not available that demonstrates acceptability for additional cycles as allowed by the requested license condition. Provide information regarding the controls that are in place to require obtaining this additional information and verification that acceptable performance is demonstrated prior to continuing use of the TVEL LTAs in additional
cycles. In particular, explain how the PRIME models and application methodology will be updated to accommodate
((
)) and address DNB propagation during accident conditions. Discuss how the updates will be validated against relevant measurements from experiments or post-irradiation examination.