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| | number = ML15090A139 | | | number = ML15090A139 |
| | issue date = 03/30/2015 | | | issue date = 03/30/2015 |
| | title = 2015/03/30 NRR E-mail Capture - Grand Gulf Nuclear Station, Unit 1, Request for Additional Information Regarding Fluence License Amendment Request (TAC No. MF5303) | | | title = NRR E-mail Capture - Grand Gulf Nuclear Station, Unit 1, Request for Additional Information Regarding Fluence License Amendment Request |
| | author name = Wang A | | | author name = Wang A |
| | author affiliation = NRC/NRR/DORL/LPLIV-2 | | | author affiliation = NRC/NRR/DORL/LPLIV-2 |
| | addressee name = Scarbrough R A | | | addressee name = Scarbrough R |
| | addressee affiliation = Entergy Nuclear Operations, Inc | | | addressee affiliation = Entergy Nuclear Operations, Inc |
| | docket = 05000416 | | | docket = 05000416 |
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| {{#Wiki_filter:1NRR-PMDAPEm ResourceFrom:Wang, AlanSent:Monday, March 30, 2015 4:24 PMTo:'SCARBROUGH, RICHARD A (RSCARBR@entergy.com)'; 'Nadeau, James'Cc:Blechman, Paula | | {{#Wiki_filter:NRR-PMDAPEm Resource From: Wang, Alan Sent: Monday, March 30, 2015 4:24 PM To: 'SCARBROUGH, RICHARD A (RSCARBR@entergy.com)'; 'Nadeau, James' Cc: Blechman, Paula |
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| ==Subject:== | | ==Subject:== |
| Grand Gulf Nuclear Station, Unit 1, Request for Additional Information Regarding Fluence License Amendment Request (TAC No. MF5303)Jeff and Jim, by letter dated November 21, 2014 (Agencywide Document Access and Management System (ADAMS) Accession No. ML14325A752), Entergy Operations, Inc. (Entergy, the licensee), submitted a license amendment request for the Grand Gulf Nuclear Station, Unit No. 1 (GGNS). The proposed amendment would revise its licensing basis to adopt a single fluence methodology. By letter dated February 18, 2015 (ADAMS Accession No. ML 15036A564), the US Nuclear Regulatory Commission (NRC) staff provided the results of the staff's acceptance review of this amendment request and requested supplemental information. Entergy responded to this request by letter dated February 18, 2015 (ADAMS Accession No. ML15049A536). The NRC staff has reviewed the licensee's February 18, 2015, submittal for regarding the fluence methodology and has determined that the following additional information is required to complete its review of the amendment request. | | Grand Gulf Nuclear Station, Unit 1, Request for Additional Information Regarding Fluence License Amendment Request (TAC No. MF5303) |
| RAI 1 Confirm that fluence corrections are applied appropriately (i.e. considering bias and uncertainty) for all calculated fluence results that exceed 20%. The supplementary information provided in the licensee's response dated February 8, 2015, to the acceptance review RAI 1b indicates that only calculated fluence results with uncertainties greater than 30% are appropriately treated; it is not stated how calculated fluence results with uncertainties between 20% and 30% are treated, if uncertainties in this range exist.
| | Jeff and Jim, by letter dated November 21, 2014 (Agencywide Document Access and Management System (ADAMS) Accession No. ML14325A752), Entergy Operations, Inc. (Entergy, the licensee), |
| RAI 2 The fluence uncertainties for upper regions of the reactor vessel are highly sensitive to the assumed above core void fraction distribution. What analysis has been performed in support of the assumed void fraction in the region above the core including consideration of the MELLLA+ operating domain?
| | submitted a license amendment request for the Grand Gulf Nuclear Station, Unit No. 1 (GGNS). The proposed amendment would revise its licensing basis to adopt a single fluence methodology. By letter dated February 18, 2015 (ADAMS Accession No. ML15036A564), the US Nuclear Regulatory Commission (NRC) staff provided the results of the staff's acceptance review of this amendment request and requested supplemental information. Entergy responded to this request by letter dated February 18, 2015 (ADAMS Accession No. ML15049A536). The NRC staff has reviewed the licensees February 18, 2015, submittal for regarding the fluence methodology and has determined that the following additional information is required to complete its review of the amendment request. |
| RAI 3 What is the potential for the high uncertainty outside-of-beltline reactor pressure vessel regions to be limiting with respect to pressure/temperature curve generation over the entire period of extended operation?
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| RAI 4 In GNRO-2015/00011, Attachment 1, it is stated that "this letter contains no new commitments." However, the response to RAI 1a in the same document states: | | ===RAI 1=== |
| Installing dosimetry capsules and/or taking scrapings in specified areas outside of the beltline region would provide dosimetry data for a future benchmark analysis outside of the beltline region. The uncertainty in the fluence calculations at locations above the top of the core is dominated by uncertainty in the water density. Taking scrapings and/or inserting dosimetry in 2these locations (during future refueling outages) would not only provide benchmarking data, but it would also provide the data needed to check the output from thermal hydraulics codes that can be used in future improvements of the upper region water density modeling. The NRC staff request that Entergy provide a regulatory commitment to install dosimetry capsules and/or scrapings, to qualify the 3D fluence method for fluence calculations outside of the beltline region. Provide details regarding the plans and schedule for installing dosimetry capsules and/or scrapings including the proposed locations for dosimetry capsule installation.
| | Confirm that fluence corrections are applied appropriately (i.e. considering bias and uncertainty) for all calculated fluence results that exceed 20%. The supplementary information provided in the licensees response dated February 8, 2015, to the acceptance review RAI 1b indicates that only calculated fluence results with uncertainties greater than 30% are appropriately treated; it is not stated how calculated fluence results with uncertainties between 20% and 30% are treated, if uncertainties in this range exist. |
| Also, provide a regulatory commitment to confirm that future calculated-to-measured (C/M) fluence values at the dosimetry location(s) are reasonably close to one including explicit definition of "reasonably close to one" (e.g. C/M greater than 0.8) and plans to address any substantial disagreements.
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| | ===RAI 2=== |
| | The fluence uncertainties for upper regions of the reactor vessel are highly sensitive to the assumed above core void fraction distribution. What analysis has been performed in support of the assumed void fraction in the region above the core including consideration of the MELLLA+ operating domain? |
| | |
| | ===RAI 3=== |
| | What is the potential for the high uncertainty outside-of-beltline reactor pressure vessel regions to be limiting with respect to pressure/temperature curve generation over the entire period of extended operation? |
| | |
| | ===RAI 4=== |
| | In GNRO-2015/00011, Attachment 1, it is stated that this letter contains no new commitments. |
| | However, the response to RAI 1a in the same document states: |
| | Installing dosimetry capsules and/or taking scrapings in specified areas outside of the beltline region would provide dosimetry data for a future benchmark analysis outside of the beltline region. The uncertainty in the fluence calculations at locations above the top of the core is dominated by uncertainty in the water density. Taking scrapings and/or inserting dosimetry in 1 |
| | |
| | these locations (during future refueling outages) would not only provide benchmarking data, but it would also provide the data needed to check the output from thermal hydraulics codes that can be used in future improvements of the upper region water density modeling. |
| | The NRC staff request that Entergy provide a regulatory commitment to install dosimetry capsules and/or scrapings, to qualify the 3D fluence method for fluence calculations outside of the beltline region. Provide details regarding the plans and schedule for installing dosimetry capsules and/or scrapings including the proposed locations for dosimetry capsule installation. |
| | Also, provide a regulatory commitment to confirm that future calculated-to-measured (C/M) fluence values at the dosimetry location(s) are reasonably close to one including explicit definition of reasonably close to one (e.g. C/M greater than 0.8) and plans to address any substantial disagreements. |
| This RAI was discussed with Mr. Richard Scarbrough on March 30, 2015, and it was agreed that a response would be provided within 30 days of receipt of this email. If circumstances result in the need to revise the requested response date, please contact me at (301) 415-1445 or via e-mail at Alan.Wang@nrc.gov. | | This RAI was discussed with Mr. Richard Scarbrough on March 30, 2015, and it was agreed that a response would be provided within 30 days of receipt of this email. If circumstances result in the need to revise the requested response date, please contact me at (301) 415-1445 or via e-mail at Alan.Wang@nrc.gov. |
| Alan Wang Project Manager (Grand Gulf Nuclear Station) Nuclear Regulatory Commission Division of Operating Reactor Licensing Alan.Wang@NRC.gov Tel: (301) 415-1445 Fax: (301) 415-1222 | | Alan Wang Project Manager (Grand Gulf Nuclear Station) |
| | Nuclear Regulatory Commission Division of Operating Reactor Licensing Alan.Wang@NRC.gov Tel: (301) 415-1445 Fax: (301) 415-1222 2 |
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| Hearing Identifier: NRR_PMDA Email Number: 1959 Mail Envelope Properties (C0A338EE37A11447B136119705BF9A3F02881272B920) | | Hearing Identifier: NRR_PMDA Email Number: 1959 Mail Envelope Properties (C0A338EE37A11447B136119705BF9A3F02881272B920) |
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| ==Subject:== | | ==Subject:== |
| Grand Gulf Nuclear Station, Unit 1, Request for Additional Information Regarding Fluence License Amendment Request (TAC No. MF5303) Sent Date: 3/30/2015 4:24:18 PM Received Date: 3/30/2015 4:24:00 PM From: Wang, Alan Created By: Alan.Wang@nrc.gov Recipients: "Blechman, Paula" <Paula.Blechman@nrc.gov> Tracking Status: None | | Grand Gulf Nuclear Station, Unit 1, Request for Additional Information Regarding Fluence License Amendment Request (TAC No. MF5303) |
| "'SCARBROUGH, RICHARD A (RSCARBR@entergy.com)'" <RSCARBR@entergy.com> Tracking Status: None "'Nadeau, James'" <jnadea1@entergy.com> | | Sent Date: 3/30/2015 4:24:18 PM Received Date: 3/30/2015 4:24:00 PM From: Wang, Alan Created By: Alan.Wang@nrc.gov Recipients: |
| Tracking Status: None Post Office: HQCLSTR02.nrc.gov Files Size Date & Time MESSAGE 4201 3/30/2015 4:24:00 PM Options Priority: Standard Return Notification: No Reply Requested: No Sensitivity: Normal Expiration Date: Recipients Received: | | "Blechman, Paula" <Paula.Blechman@nrc.gov> |
| }} | | Tracking Status: None |
| | "'SCARBROUGH, RICHARD A (RSCARBR@entergy.com)'" <RSCARBR@entergy.com> |
| | Tracking Status: None |
| | "'Nadeau, James'" <jnadea1@entergy.com> |
| | Tracking Status: None Post Office: HQCLSTR02.nrc.gov Files Size Date & Time MESSAGE 4201 3/30/2015 4:24:00 PM Options Priority: Standard Return Notification: No Reply Requested: No Sensitivity: Normal Expiration Date: |
| | Recipients Received:}} |
Letter Sequence RAI |
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MONTHYEARML14325A7522014-11-21021 November 2014 License Amendment Request Application to Revise Current Fluence Methodology Project stage: Request ML15036A5642015-02-18018 February 2015 Updated Fluence Methodology License Amendment Request Unacceptable with Opportunity to Supplement Project stage: Other ML15090A1392015-03-30030 March 2015 NRR E-mail Capture - Grand Gulf Nuclear Station, Unit 1, Request for Additional Information Regarding Fluence License Amendment Request Project stage: RAI GNRO-2015/00021, Follow-up Response to U.S. Nuclear Regulatory Commission Letter, Updated Fluence Methodology License Amendment Request Unacceptable with Opportunity to Supplement, Dated February 18, 2015, to Provide.2015-03-30030 March 2015 Follow-up Response to U.S. Nuclear Regulatory Commission Letter, Updated Fluence Methodology License Amendment Request Unacceptable with Opportunity to Supplement, Dated February 18, 2015, to Provide. Project stage: Supplement NRC-2015-0073, Comment (1) of Anonymous Individual Opposing on Applications and Amendments to Facility Operating Licenses and Combined Licenses Involving No Significant Hazards Considerations2015-04-30030 April 2015 Comment (1) of Anonymous Individual Opposing on Applications and Amendments to Facility Operating Licenses and Combined Licenses Involving No Significant Hazards Considerations Project stage: Request GNRO-2015/00031, Response to Request for Additional Information Regarding Fluence License Amendment Request2015-05-0808 May 2015 Response to Request for Additional Information Regarding Fluence License Amendment Request Project stage: Response to RAI GNRO-2015/00038, Response to Request for Additional Information Regarding Fluence License Amendment Request, Request for Commitment2015-06-11011 June 2015 Response to Request for Additional Information Regarding Fluence License Amendment Request, Request for Commitment Project stage: Response to RAI ML15141A1852015-07-15015 July 2015 Request for Withholding Information from Public Disclosure Project stage: Withholding Request Acceptance GNRO-2015/00046, Provides Clarification to Fluence Methodology License Amendment Request Letter GNRO-2014/00080 Dated November 21, 2014 to Include Draft marked-up UFSAR Pages and a Regulatory Commitment to Revise the GGNS UFSAR Upon NRC Approval.2015-08-10010 August 2015 Provides Clarification to Fluence Methodology License Amendment Request Letter GNRO-2014/00080 Dated November 21, 2014 to Include Draft marked-up UFSAR Pages and a Regulatory Commitment to Revise the GGNS UFSAR Upon NRC Approval. ML15229A2182015-08-18018 August 2015 Redacted, Issuance of Amendment Adoption of Single Fluence Methodology Project stage: Approval GNRO-2015/00058, Response to License Renewal Application (LRA) Request for Additional Information (RAI) Set 47, Question 4.2.1-2c (5) (a) I2015-09-0101 September 2015 Response to License Renewal Application (LRA) Request for Additional Information (RAI) Set 47, Question 4.2.1-2c (5) (a) I Project stage: Request 2015-05-08
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Category:E-Mail
MONTHYEARML23348A1222023-12-14014 December 2023 NRR E-mail Capture - Grand Gulf, River Bend, and Waterford, Unit 3 - 2nd Round of Official RAIs for RR EN-RR-22-001, Use ASME Code Case N-752, Risk Informed Categorization for Class 2 and 3 Systems ML23335A0652023-12-0101 December 2023 NRR E-mail Capture - GGNS - Audit Questions for LARs Associated with TSTF-505, Provide Risk-Informed Extended Completion Times - RITSTF Init. 4b and 50.69, Risk-Informed Cat. and Treatment of SSCs for Nuclear Pwr Rx (L-2023-LLA-0081/0080) ML23240A3412023-08-28028 August 2023 NRR E-mail Capture - ANO-2, Grand Gulf, and River Bend - Acceptance Review of LAR Revising TSs to Adopt TSTF-205, Revision of Channel Calibration, Channel Functional Test, and Related Definitions ML23191A2802023-07-10010 July 2023 NRR E-mail Capture - Grand Gulf - Acceptance Review for LAR Adopting TSTF-505, Rev. 2, Provide Risk-Informed Completion Times - RITSTF Initiative 4b ML23191A8662023-07-10010 July 2023 NRR E-mail Capture - Grand Gulf - Acceptance Review of LAR Adopting 10 CFR 50.69, Risk-Informed Categorization and Treatment of SSCs for Nuclear Power Reactors ML23116A1462023-04-26026 April 2023 NRR E-mail Capture - Entergy Fleet (Grand Gulf and River Bend) - Final RAI for Request to Update ASME Code Relief Request Safety Evaluations with NRC-Approved Revision of BWRVIP Guidelines (GG-ISI-020, and RBS-ISI-019) ML23072A3672023-03-0909 March 2023 NRR E-mail Capture - Entergy Fleet - Acceptance Review of Quality Assurance Program Manual Reduction in Commitment ML23009B6912023-01-0909 January 2023 NRR E-mail Capture - Grand Gulf, Unit 1 and River, Unit 1 - Acceptance of Requested Licensing Action Request to Update ASME Code RR SE with NRC-Approved Revision of BWRVIP Guidelines ML22353A6122022-12-19019 December 2022 March 2023 Emergency Preparedness Exercise Inspection - Request for Information ML22206A0152022-07-21021 July 2022 NRR E-mail Capture - Entergy (Grand Gulf, River Bend, and Waterford-3) - Acceptance Review of the RR EN-RR-22-001, Case N-752, Risk-informed Cat & Treatment for Repair/Replacement Activities in Class 2 & 3 Systems ML22173A0372022-06-21021 June 2022 NRR E-mail Capture - Entergy (Grand Gulf and River Bend) - Acceptance Review of the License Amendment Request to Revise Technical Specifications to Adopt TSTF-580, Provide Exception from Entering Mode 4 with No Operable RHR Shutdown Cooling ML22110A1172022-04-19019 April 2022 (GG) 2022 Emergency Preparedness (EP) Program Inspection RFI Sdh 041922 ML22075A3692022-03-0303 March 2022 Email Grand Gulf 2022 PI&R Request for Information ML21312A4792021-11-0505 November 2021 Email: NRC Staff Preliminary Questions Regarding X Energy LLC Xe-100 Topical Report: Risk-Informed Performance-Based Licensing Basis Development ML21308A5602021-11-0404 November 2021 NRR E-mail Capture - Arkansas Nuclear One, Units 1 and 2, Grand Gulf, River Bend, and Waterford, Unit 3 - Acceptance Review of LAR to Adopt TSTF-554, Revise Reactor Coolant Leakage Requirements ML21292A0112021-10-18018 October 2021 NRR E-mail Capture - ANO, 1 and 2, Grand Gulf, River Bend, Waterford, 3 - Acceptance Review of LAR to Adopt TSTF-541, Add Exceptions to Surveillance Requirements for Valves and Dampers Locked in the Actuated Position ML21174A0342021-06-22022 June 2021 NRR E-mail Capture - Entergy Fleet (ANO, Ggulf, Rbend, & Waterford) - Acceptance Review for Relief Request to Use a Provision of a Later Edition of the ASME Code, Section XI for Periodic System Pressure Tests Exemptions ML21165A1352021-06-14014 June 2021 NRR E-mail Capture - Grand Gulf - Acceptance Review for Inserice Testing Program Relief Request VRR-GGNS-2021-1, Pressure Isolation Valve Testing Frequency ML21119A2152021-04-28028 April 2021 NRR E-mail Capture - Energy Harbor Fleet, Beaver Valley Units 1 and 2 and DAVIS-BESSE Unit 1 - Acceptance of Relief Request Proposed Alternative to Use ASME OM Code Case OMN-27 ML21109A2142021-04-19019 April 2021 NRR E-mail Capture - Entergy Fleet (Grand Gulf and River Bend) - Rev. Est Hours for Review of Relief Request (RR) - ASME Code RR Safety Eval with NRC-Approved Rev of BWRVIP Guidelines (GG-ISI-020 and RBS-ISI-019) ML21109A2132021-03-23023 March 2021 NRR E-mail Capture - Entergy Fleet (Grand Gulf and River Bend) - Relief Request (RR) Associated with ASME Code RR Safety Evaluations with NRC-Approved Revision of BWRVIP Guidelines (GG-ISI-020 and RBS-ISI-019) ML21068A4092021-03-0909 March 2021 NRR E-mail Capture - Entergy Fleet (GGNS and RBS) -Approval of TSTF-501 LAR, Relocate Sored Fuel Oil and Lube Oil Volume Values to Licensee Control ML21015A3452021-01-14014 January 2021 NRR E-mail Capture - Grand Gulf and River Bend - Revised Estimated Hours for Relief Request Associated with ASME Code RR SEs with NRC-Approved Revision of BWRVIP Guidelines (GG-ISI-020 and RBS-ISI-019) ML20363A1462020-12-22022 December 2020 Request for Information: Grand Gulf EP Exercise Inspection - March 2021 ML20352A1192020-12-10010 December 2020 Email from Thomas Saporito 12-10-20 ML20329A1442020-11-20020 November 2020 Terrapower QAPD Preliminary Questions Email ML20323A4162020-11-18018 November 2020 Response to Choice Letter (EA-20-094) ML20337A2712020-11-0909 November 2020 Email - Grand Gulf Nuclear Station 050-00416, Requested Regulatory Conference ML20289A3542020-10-14014 October 2020 NRR E-mail Capture - Entergy Fleet (Grand Gulf and River Bend) - Acceptance Review of TSTF-563 LAR, Revise Instrument Testing Definitions to Incorporate the Surveillance Frequency Control Program ML20258A0202020-09-0909 September 2020 EP Program Inspection RFI, Request for Information to Support and Prepare for Emergency Preparedness (EP) Program Inspection Scheduled to Occur the Week of November 16, 2020 ML20260H4422020-09-0808 September 2020 NRR E-mail Capture - Entergy Fleet (Grand Gulf and River Bend) - Official RAIs for RR Associated with Updating ASME Code RR SEs with NRC-Approved Revision of BWRVIP Guidelines (GG-ISI-020 and RBS-ISI-019) ML20176A4832020-06-22022 June 2020 NRR E-mail Capture - Entergy Fleet (Grand Gulf and River Bend) - Acceptance Review of Relief Request Associated with ASME Code RR SE with NRC-Approved Revision of BWRVIP Guidelines (GG-ISI-020 and RBS-ISI-019) ML20150A6012020-05-29029 May 2020 NRR E-mail Capture - Grand Gulf - Official RAI for LAR Associated with Containment ILRT Interval Change from 10 Years to 15 Years ML20097B8032020-04-0303 April 2020 NRR E-mail Capture - Grand Gulf - Acceptance Review for the Exigent LAR Associated with One-Time Extension of Appendix J Type a Integrated Leakage Rate Test Frequencies from 11.5 Years to 13.5 Years ML20093C3072020-04-0101 April 2020 NRR E-mail Capture - (External_Sender) Entergy Fleet - Performance-Based Cyber Security Testing Plan Fee Waiver Response Letter (EPID P-2020-PRF-0000; CAC No. 001648) ML20079D9302020-03-19019 March 2020 NRR E-mail Capture - Entergy Fleet (Grand Gulf and River Bend) - Acceptance Review of LAR Associated with Adopting TSTF-501, Relocate Stored Fuel Oil and Lube Oil Volumes to Licensee Control ML20076B6322020-03-16016 March 2020 NRR E-mail Capture - Grand Gulf - Acceptance Review for the LAR Associated with Permanent Extension of Appendix J Type a Integrated Leakage Rate Test Frequencies ML20057G1752020-02-24024 February 2020 NRR E-mail Capture - Entergy Fleet (Grand Gulf and River Bend) - Acceptance Review of LAR Associated with TSTF-566, Revise Actions for Inoperable RHR-Shutdown Cooling Subsystems ML20057G1592020-02-24024 February 2020 NRR E-mail Capture - Entergy Fleet (Grand Gulf and River Bend) - Acceptance Review of LAR Associated with TSTF-439, Eliminate Second Completion Times Limiting Time from Discovery of Failure to Meet an LCO ML19242C0122019-08-29029 August 2019 2.206 Petitioner (No Public Meeting Required) ML19339H4362019-08-26026 August 2019 Request for Information IR 05000416/2019-004 ML19115A3512019-04-25025 April 2019 LTR-19-0177 Tom Gurdziel, E-mail a Matter of Fairness Entergy Grand Gulf Seems to Be Running Rather Steadily at 100 Percent ML19151A3312019-04-0303 April 2019 (OEDO-19-00053)10 CFR 2.206 Petition Involving Grand Gulf Nuclear Station ML19095B7622019-04-0303 April 2019 Acceptance Review Results for License Amendment Request to Adopt TSTF-564, Revision 2, Safety Limit MCPR (Minimum Critical Power Ratio), for Grand Gulf Nuclear Station, Unit 1 and River Bend Station, Unit 1 (EPID L-22019-LLA-0051) ML19078A3772019-03-19019 March 2019 NRR E-mail Capture - Grand Gulf - Official Rais for Relief Request GG-ISI-023, Inservice Inspection Impracticality, Limited Coverage Examinations During the Third 10-Year Inservice Inspection Interval ML19059A1782019-02-28028 February 2019 Acceptance Review Results for Relief Request No. EN-19-RR-1 to Use ASME Code Case N-831-1 for Entergy Fleet ML19059A0292019-02-27027 February 2019 NRR E-mail Capture - Acceptance Review Results for License Amendment Request to Adopt TSTF-529, Revision 4, Clarify Use and Application Rules, for Entergy Fleet ML19053A7622019-02-22022 February 2019 NRR E-mail Capture - Grand Gulf - Acceptance of the LAR Associated with Revising TS 3.3.1.1 (RPS Instrumentation) and TS 3.3.4.1 (EOC-RPT Instrumentation) ML19044A7352019-02-13013 February 2019 NRR E-mail Capture - 10 CFR 2.206 Petition Involving Grand Gulf Nuclear Station - Acknowledgement Email (OEDO-19-00053) ML19045A0072019-02-13013 February 2019 NRR E-mail Capture - 10 CFR 2.206 Petition Involving Grand Gulf Nuclear Station - Acknowledgement Email (OEDO-19-00053) 2023-08-28
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NRR-PMDAPEm Resource From: Wang, Alan Sent: Monday, March 30, 2015 4:24 PM To: 'SCARBROUGH, RICHARD A (RSCARBR@entergy.com)'; 'Nadeau, James' Cc: Blechman, Paula
Subject:
Grand Gulf Nuclear Station, Unit 1, Request for Additional Information Regarding Fluence License Amendment Request (TAC No. MF5303)
Jeff and Jim, by letter dated November 21, 2014 (Agencywide Document Access and Management System (ADAMS) Accession No. ML14325A752), Entergy Operations, Inc. (Entergy, the licensee),
submitted a license amendment request for the Grand Gulf Nuclear Station, Unit No. 1 (GGNS). The proposed amendment would revise its licensing basis to adopt a single fluence methodology. By letter dated February 18, 2015 (ADAMS Accession No. ML15036A564), the US Nuclear Regulatory Commission (NRC) staff provided the results of the staff's acceptance review of this amendment request and requested supplemental information. Entergy responded to this request by letter dated February 18, 2015 (ADAMS Accession No. ML15049A536). The NRC staff has reviewed the licensees February 18, 2015, submittal for regarding the fluence methodology and has determined that the following additional information is required to complete its review of the amendment request.
RAI 1
Confirm that fluence corrections are applied appropriately (i.e. considering bias and uncertainty) for all calculated fluence results that exceed 20%. The supplementary information provided in the licensees response dated February 8, 2015, to the acceptance review RAI 1b indicates that only calculated fluence results with uncertainties greater than 30% are appropriately treated; it is not stated how calculated fluence results with uncertainties between 20% and 30% are treated, if uncertainties in this range exist.
RAI 2
The fluence uncertainties for upper regions of the reactor vessel are highly sensitive to the assumed above core void fraction distribution. What analysis has been performed in support of the assumed void fraction in the region above the core including consideration of the MELLLA+ operating domain?
RAI 3
What is the potential for the high uncertainty outside-of-beltline reactor pressure vessel regions to be limiting with respect to pressure/temperature curve generation over the entire period of extended operation?
RAI 4
In GNRO-2015/00011, Attachment 1, it is stated that this letter contains no new commitments.
However, the response to RAI 1a in the same document states:
Installing dosimetry capsules and/or taking scrapings in specified areas outside of the beltline region would provide dosimetry data for a future benchmark analysis outside of the beltline region. The uncertainty in the fluence calculations at locations above the top of the core is dominated by uncertainty in the water density. Taking scrapings and/or inserting dosimetry in 1
these locations (during future refueling outages) would not only provide benchmarking data, but it would also provide the data needed to check the output from thermal hydraulics codes that can be used in future improvements of the upper region water density modeling.
The NRC staff request that Entergy provide a regulatory commitment to install dosimetry capsules and/or scrapings, to qualify the 3D fluence method for fluence calculations outside of the beltline region. Provide details regarding the plans and schedule for installing dosimetry capsules and/or scrapings including the proposed locations for dosimetry capsule installation.
Also, provide a regulatory commitment to confirm that future calculated-to-measured (C/M) fluence values at the dosimetry location(s) are reasonably close to one including explicit definition of reasonably close to one (e.g. C/M greater than 0.8) and plans to address any substantial disagreements.
This RAI was discussed with Mr. Richard Scarbrough on March 30, 2015, and it was agreed that a response would be provided within 30 days of receipt of this email. If circumstances result in the need to revise the requested response date, please contact me at (301) 415-1445 or via e-mail at Alan.Wang@nrc.gov.
Alan Wang Project Manager (Grand Gulf Nuclear Station)
Nuclear Regulatory Commission Division of Operating Reactor Licensing Alan.Wang@NRC.gov Tel: (301) 415-1445 Fax: (301) 415-1222 2
Hearing Identifier: NRR_PMDA Email Number: 1959 Mail Envelope Properties (C0A338EE37A11447B136119705BF9A3F02881272B920)
Subject:
Grand Gulf Nuclear Station, Unit 1, Request for Additional Information Regarding Fluence License Amendment Request (TAC No. MF5303)
Sent Date: 3/30/2015 4:24:18 PM Received Date: 3/30/2015 4:24:00 PM From: Wang, Alan Created By: Alan.Wang@nrc.gov Recipients:
"Blechman, Paula" <Paula.Blechman@nrc.gov>
Tracking Status: None
"'SCARBROUGH, RICHARD A (RSCARBR@entergy.com)'" <RSCARBR@entergy.com>
Tracking Status: None
"'Nadeau, James'" <jnadea1@entergy.com>
Tracking Status: None Post Office: HQCLSTR02.nrc.gov Files Size Date & Time MESSAGE 4201 3/30/2015 4:24:00 PM Options Priority: Standard Return Notification: No Reply Requested: No Sensitivity: Normal Expiration Date:
Recipients Received: