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| | number = ML18249A193 | | | number = ML18249A193 |
| | issue date = 09/05/2018 | | | issue date = 09/05/2018 |
| | title = Summer TS 4.3.3.6 SR LAR - Request for Additional Information | | | title = TS 4.3.3.6 SR LAR - Request for Additional Information |
| | author name = Mahoney M | | | author name = Mahoney M |
| | author affiliation = NRC/NRR/DORL/LPLII-1 | | | author affiliation = NRC/NRR/DORL/LPLII-1 |
Letter Sequence RAI |
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EPID:L-2018-LLA-0226, License Amendment Request LAR-18-03422 Request for a One-Time Extension to the Surveillance Frequency 4.3.3.6 of the Core Exit Temperature Instrumentation (Approved, Closed) |
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MONTHYEARRC-18-0111, License Amendment Request LAR-18-03422 Request for a One-Time Extension to the Surveillance Frequency 4.3.3.6 of the Core Exit Temperature Instrumentation2018-08-24024 August 2018 License Amendment Request LAR-18-03422 Request for a One-Time Extension to the Surveillance Frequency 4.3.3.6 of the Core Exit Temperature Instrumentation Project stage: Request RC-18-0113, (Vcsns), Unit 1 - Supplement to License Amendment Request LAR-18-03422 Request for a One-Time Extension to the Surveillance Frequency 4.3.3.6 of the Core Exit Temperature Instrumentation2018-08-31031 August 2018 (Vcsns), Unit 1 - Supplement to License Amendment Request LAR-18-03422 Request for a One-Time Extension to the Surveillance Frequency 4.3.3.6 of the Core Exit Temperature Instrumentation Project stage: Supplement ML18250A3092018-09-0404 September 2018 NRR E-mail Capture - V. C. Summer, Unit 1 - Acceptance Review Results - License Amendment Request Related to Revision of Surveillance Requirement 4.3.3.6 Project stage: Acceptance Review ML18243A1162018-09-0505 September 2018 Exigent 14-day FRN Project stage: Other ML18243A0872018-09-0505 September 2018 Individual Notice of Consideration of Issuance of Amendment to Renewed Facility Operating License NPF-12, Proposed No Significant Hazards Consideration,(Exigent Circumstances) Project stage: Other ML18249A1932018-09-0505 September 2018 TS 4.3.3.6 SR LAR - Request for Additional Information Project stage: RAI RC-18-0116, (Vcsns), Unit 1 - Request for a One-Time Extension to the Surveillance Frequency 4.4.4.6 of the Core Exit Temperature Instrumentation - Response to Request for Additional Information2018-09-11011 September 2018 (Vcsns), Unit 1 - Request for a One-Time Extension to the Surveillance Frequency 4.4.4.6 of the Core Exit Temperature Instrumentation - Response to Request for Additional Information Project stage: Response to RAI RC-18-0119, (Vcsns), Unit 1 - Supplement to License Amendment Request LAR-18-03422, Request for a One-Time Extension to the Surveillance Frequency 4.3.3.6 of the Core Exit Temperature Instrumentation2018-09-19019 September 2018 (Vcsns), Unit 1 - Supplement to License Amendment Request LAR-18-03422, Request for a One-Time Extension to the Surveillance Frequency 4.3.3.6 of the Core Exit Temperature Instrumentation Project stage: Supplement ML18260A0272018-09-25025 September 2018 Issuance of Exigent Amendment One Time Extension to the Surveillance Frequency 4.3.3.6 of the Core Exit Temperature Instrumentation Project stage: Approval RC-18-0136, (Vcsns), Unit 1 - Request to Remove the Expired One-Time Extension to Surveillance Frequency 4.3.3.6 of the Core Exit Temperature Instrumentation and to Remove the Index from Technical Specifications (LAR-18-04683)2018-12-12012 December 2018 (Vcsns), Unit 1 - Request to Remove the Expired One-Time Extension to Surveillance Frequency 4.3.3.6 of the Core Exit Temperature Instrumentation and to Remove the Index from Technical Specifications (LAR-18-04683) Project stage: Other 2018-09-11
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Category:E-Mail
MONTHYEARML24232A1812024-08-19019 August 2024 Summer_2024-04_RP Information Request ML24190A0412024-07-0505 July 2024 Notification of Inspection and Request for Information ML24170A3892024-06-18018 June 2024 NRR E-mail Capture - Acceptance Review for VC Summer Containment Tendon Relief Request (L-2024-LLR-0035) ML24165A1912024-06-13013 June 2024 003 Radiation Safety Baseline Inspection Information Request ML24156A0022024-06-0303 June 2024 VC Summer SLRA - Requests for Additional Information - Set 2 - Email from Marieliz Johnson to Eric Carr ML24129A0722024-05-0808 May 2024 VC Summer SLRA - Requests for Confirmation of Information - Set 1 - Email from Marieliz Johnson to Eric Carr ML24075A1872024-03-15015 March 2024 NRR E-mail Capture - Draft RAIs for Alternative Request RR-5-V2 (L-2023-LLR-0068) ML24067A0672024-03-0707 March 2024 NRR E-mail Capture - Draft RAIs for Inverter CT License Amendment Request TS 3.8.3.1, Onsite Power Distribution - Operating, (L-2023-LLA-0157) ML24061A1892024-03-0101 March 2024 NRR E-mail Capture - Request for Additional Information (RAI) for VC Summer Inverter License Amendment Request (LAR) to Revise the Emergency Plan ML24052A0102024-02-16016 February 2024 NRR E-mail Capture - Draft RAIs for Emergency Plan (EP) Changes License Amendment Request (LAR) (L-2023-LLA-0083) ML24026A2802024-01-25025 January 2024 Acceptance Review for Virgil C. Summer Relief Requests RR-5-V1, RR-5-V2, and RR-5-V3 (EPIDs L-2023-LLR-0067, L-2023-LLR-0068, and L-2023-LLR-0069) (Email) ML23270B8712023-09-27027 September 2023 NRR E-mail Capture - Draft RAIs for License Amendment Request (LAR) to Revise the Virgil C. Summer Nuclear Station (VCSNS) Unit 1 Emergency Plan (L-2023-LLA-0083) ML23193A9552023-07-12012 July 2023 NRR E-mail Capture - Acceptance Review for VC Summer and Surry Relief Request (L-2023-LLR-0029) ML23186A1392023-07-0505 July 2023 NRR E-mail Capture - Acceptance Review for VC Summer Emergency Plan (EP) License Amendment Request (LAR) (L-2023-LLA-0083) ML23131A1492023-05-10010 May 2023 2023 V.C. Summer Commercial Grade Dedication Inspection Information Request ML23044A3392023-02-13013 February 2023 NRR E-mail Capture - Acceptance Review for Change to Reactor Vessel Surveillance Capsule Schedule (L-2023-LLL-0002) ML23027A0122023-01-26026 January 2023 002 Radiation Safety Baseline Inspection Information Request ML23026A0152023-01-23023 January 2023 NRR E-mail Capture - Feb 14, 2023 Public Meeting with the Dominion Energy to Discuss a Planned Emergency Preparedness Submittal to Relocate the Emergency Operations Facility for the VC Summer Power Station - Dominion Slides ML22263A0502022-09-19019 September 2022 NRR E-mail Capture - Draft Request for Additional Information for Proposed Alternative Request RR-4-26 Extension of Steam Generator Primary Inlet Nozzle Dissimilar Metal Weld Inspection Interval V.C. Summer Unit 1 ML22194A9422022-07-13013 July 2022 NRC 50.59 Inspection (IP 71111.17T) Information Request ML22174A3552022-06-23023 June 2022 NRR E-mail Capture - Acceptance Review for Dominion Fleet LAR to Implement TSTF-554 (L-2022-LLA-0078) ML22173A0292022-06-17017 June 2022 NRR E-mail Capture - Acceptance Review for Summer to Defer Weld Examinations (L-2022-LLR-0052) ML22139A2302022-05-19019 May 2022 NRR E-mail Capture - Acceptance Review for Summer TS 4.6.2.1.d LAR (L-2022-LLR-0060) ML22139A2322022-05-19019 May 2022 NRR E-mail Capture - Acceptance Review for Summer TSTF-491 LAR (L-2022-LLR-0059) ML22084A4052022-03-25025 March 2022 NRR E-mail Capture - Acceptance Review for Summer Dissimilar Metal Weld Inspection Interval (L-2022-LLR-0033) ML22018A0272022-01-18018 January 2022 2022 All RFI Responses - Exercise and Program Inspections - Revl ML21333A1892021-11-29029 November 2021 NRR E-mail Capture - Draft RAI for Summer LAR Relocate Surveillance Frequencies to Licensee Control - RITSTF Initiative 5b, (TSTF-425) ML21253A1352021-09-0808 September 2021 Document Request for VC Summer Nuclear Station - Radiation Protection Inspection - Inspection Report 2021-04 ML21197A0432021-07-15015 July 2021 VCS ISI 2021004 RFI - Combined ML21187A1242021-06-28028 June 2021 10CFR Part 21 Update - Deviation Identified in the Bolting Utilized to Maintain Seismic Qualification ML21173A1782021-06-22022 June 2021 NRR E-mail Capture - Acceptance Review - Summer LAR Unit Staff Qualification Relocation TS to Quality Assurance Program Description (QAPD) ML21145A0222021-05-24024 May 2021 003 Radiation Safety Baseline Inspection Information Request ML21131A0402021-05-11011 May 2021 NRR E-mail Capture - V.C. Summer, Unit 1 - Final RAI for the Spring 2020 RFO Sgtir Review ML21125A1942021-05-0505 May 2021 NRR E-mail Capture - Virgil C. Summer Nuclear Station, Unit 1 - Acceptance Review (L-2021-LLA-0064) ML21020A0562021-01-20020 January 2021 Email Capture Upcoming V.C. Summer POV Inspection (IP71111.21N.02) Information Request ML20342A1822020-12-0707 December 2020 NRR E-mail Capture - Final RAI for Summer LAR - TS 3.6.4 ML20342A3822020-12-0707 December 2020 NRR E-mail Capture - Final RAIs for Summer Fs LOCA LAR ML20321A2112020-11-16016 November 2020 NRR E-mail Capture - Summer, Unit 1 - Final RAIs for the SG Tube Inspection Report Review ML20316A0122020-11-0404 November 2020 NRR E-mail Capture - V.C. Summer Nuclear Station, Unit 1 - Acceptance Review (L-2020-LLR-0141) ML20302A2032020-10-28028 October 2020 NRR E-mail Capture - V.C. Summer Nuclear Station, Unit 1 - Acceptance Review (L-2020-LLR-0141) ML20260H4262020-09-0303 September 2020 NRR E-mail Capture - Acceptance Review for Fleet Relief Request for Code Case N-885 ML20178A5892020-06-26026 June 2020 NRR E-mail Capture - Virgil C. Summer Nuclear Station, Unit 1 - Acceptance Review of the Fsloca LAR (L-2020-LLA-0124) ML20178A5912020-06-23023 June 2020 NRR E-mail Capture - VC Summer Unit Alternate Request RR-4-21 ML20178A5932020-06-23023 June 2020 NRR E-mail Capture - VC Summer Unit Alternate Request RR-4-19 ML20149K4262020-05-21021 May 2020 NRR E-mail Capture - V. C. Summer, Unit 1 - Acceptance of License Amendment Request (LAR-20-142) Related to TS 3.6.4, Containment Isolation Valves (L-2020-LLA-0092) ML19218A3742019-08-0606 August 2019 NRR E-mail Capture - Virgil C. Summer, Unit 1 -Acceptance of Relief Request (RR-4-20), Use of Encoded Phased Array Ultrasonic Examination Techniques in Lieu of Radiography ML19214A2732019-08-0202 August 2019 NRR E-mail Capture - Virgil C. Summer, Unit 1 - Acceptance of License Amendment Request to Change Company Name ML19211D5102019-07-30030 July 2019 NRR E-mail Capture - Virgil C. Summer Nuclear Station, Unit No. 1 - Request for Additional Information LAR-16-01490 NFPA-805 (Supplement to PRA RAI 03) ML19179A1262019-06-27027 June 2019 NRR E-mail Capture - Virgil C. Summer Nuclear Station, Unit No. 1 - Request for Additional Information LAR-16-01490 NFPA-805 Program Revisions ML19155A2752019-06-0404 June 2019 VC Summer 2019003 Rad Safety Inspection Document Request 2024-08-19
[Table view] Category:Request for Additional Information (RAI)
MONTHYEARML24232A1812024-08-19019 August 2024 Summer_2024-04_RP Information Request ML24190A0412024-07-0505 July 2024 Notification of Inspection and Request for Information ML24156A0032024-06-0303 June 2024 VC Summer SLRA - Requests for Additional Information - Set 2 ML24075A1872024-03-15015 March 2024 NRR E-mail Capture - Draft RAIs for Alternative Request RR-5-V2 (L-2023-LLR-0068) ML24067A0672024-03-0707 March 2024 NRR E-mail Capture - Draft RAIs for Inverter CT License Amendment Request TS 3.8.3.1, Onsite Power Distribution - Operating, (L-2023-LLA-0157) ML24052A0102024-02-16016 February 2024 NRR E-mail Capture - Draft RAIs for Emergency Plan (EP) Changes License Amendment Request (LAR) (L-2023-LLA-0083) ML23270B8712023-09-27027 September 2023 NRR E-mail Capture - Draft RAIs for License Amendment Request (LAR) to Revise the Virgil C. Summer Nuclear Station (VCSNS) Unit 1 Emergency Plan (L-2023-LLA-0083) ML22263A0502022-09-19019 September 2022 NRR E-mail Capture - Draft Request for Additional Information for Proposed Alternative Request RR-4-26 Extension of Steam Generator Primary Inlet Nozzle Dissimilar Metal Weld Inspection Interval V.C. Summer Unit 1 ML22194A9422022-07-13013 July 2022 NRC 50.59 Inspection (IP 71111.17T) Information Request ML22075A0482022-03-16016 March 2022 V.C. Summer Nuclear Station - Information Request for the Cyber-Security Baseline Inspection, Notification to Perform Inspection 05000395/2022401 ML21333A1892021-11-29029 November 2021 NRR E-mail Capture - Draft RAI for Summer LAR Relocate Surveillance Frequencies to Licensee Control - RITSTF Initiative 5b, (TSTF-425) ML21253A1352021-09-0808 September 2021 Document Request for VC Summer Nuclear Station - Radiation Protection Inspection - Inspection Report 2021-04 ML21154A2792021-06-0303 June 2021 Requalification Program Inspection 05000395/2021003 - Virgil C. Summer Nuclear Station, Unit 1, ML21145A0222021-05-24024 May 2021 003 Radiation Safety Baseline Inspection Information Request ML21131A0402021-05-11011 May 2021 NRR E-mail Capture - V.C. Summer, Unit 1 - Final RAI for the Spring 2020 RFO Sgtir Review ML21020A0562021-01-20020 January 2021 Email Capture Upcoming V.C. Summer POV Inspection (IP71111.21N.02) Information Request ML20342A1822020-12-0707 December 2020 NRR E-mail Capture - Final RAI for Summer LAR - TS 3.6.4 ML20342A3822020-12-0707 December 2020 NRR E-mail Capture - Final RAIs for Summer Fs LOCA LAR ML20321A2112020-11-16016 November 2020 NRR E-mail Capture - Summer, Unit 1 - Final RAIs for the SG Tube Inspection Report Review ML20196L7782020-07-13013 July 2020 Notification of Virgil C. Summer Nuclear Station Design Bases Assurance Inspection U.S. Nuclear Regulatory Commission Inspection Report 05000395/2020010 ML20106E8902020-04-15015 April 2020 Program Inspection RFI ML20056E3042020-02-25025 February 2020 VC Summer 2020-002 Radiation Safety Baseline Inspection Information Request ML19211D5102019-07-30030 July 2019 NRR E-mail Capture - Virgil C. Summer Nuclear Station, Unit No. 1 - Request for Additional Information LAR-16-01490 NFPA-805 (Supplement to PRA RAI 03) ML19179A1262019-06-27027 June 2019 NRR E-mail Capture - Virgil C. Summer Nuclear Station, Unit No. 1 - Request for Additional Information LAR-16-01490 NFPA-805 Program Revisions ML19095A6532019-04-0404 April 2019 NRR E-mail Capture - Virgil C. Summer Nuclear Station, Unit No. 1 - Request for Additional Information NFPA-805 Program Revisions LAR ML19072A1442019-03-13013 March 2019 NRR E-mail Capture - Virgil C. Summer Nuclear Station, Unit No. 1 - Request for Additional Information LAR-16-01490 NFPA-805 Program Revisions ML19009A1052019-01-0909 January 2019 NRR E-mail Capture - Virgil C. Summer Nuclear Station, Unit No. 1 - Request for Additional Information LAR-10-02395, TS 3.8.2, D.C. Sources - Operating ML18249A1932018-09-0505 September 2018 TS 4.3.3.6 SR LAR - Request for Additional Information ML18225A0932018-08-13013 August 2018 Notification of Inspection and Request for Information ML18218A2622018-08-0101 August 2018 Emergency Preparedness Program Inspection Request for Information ML18066A0002018-03-0808 March 2018 Request for Additional Information Integrated Leak Rate Test Peak Calculated Containment Internal Pressure Change ML18023B0692018-02-15015 February 2018 Request for Additional Information Relief Request (RR-4-13), Use of Risk-Informed Process as an Alternative for the Selection of Class 1 and Class 2 Piping Welds ML17095A2842017-05-11011 May 2017 Request for Additional Information License Amendment Request for Implementation of TSTF-411 (WCAP-15376-P-A), Revision 1 ML17067A5322017-03-0808 March 2017 Notification of Radiation Protection Baseline Inspection and Request for Information ML17059C5382017-02-23023 February 2017 Notification of Inspection and Request for Information ML16302A1252016-11-0808 November 2016 Request for Additional Information License Amendment Request for Implementation of TSTF-411 and WCAP-15376-P-A, Revision 1 RC-16-0112, NRC Request Information Baseline Radiation Safety Inspection2016-07-0707 July 2016 NRC Request Information Baseline Radiation Safety Inspection ML16111A0912016-05-0303 May 2016 Request for Additional Information Regarding the Station Physical Security Plan, Revision 14 ML16097A0812016-04-0808 April 2016 Request for Additional Information ML16064A0332016-03-0303 March 2016 NRR E-mail Capture - Request for Additional Information Related to the March 1, 2016, Exigent Amendment Request ML16042A4712016-02-18018 February 2016 Request for Additional Information ML15320A3382015-12-0101 December 2015 Request for Additional Information Regarding License Basis Changes in Steam Generator Tube Rupture Analysis RC-15-0177, Submits LAR-12-04269, License Basis Changes in Steam Generator Tube Rupture Analysis Response to Response for Additional Information2015-11-0505 November 2015 Submits LAR-12-04269, License Basis Changes in Steam Generator Tube Rupture Analysis Response to Response for Additional Information ML15261A0512015-09-22022 September 2015 Request for Additional Information Regarding License Basis Changes in Steam Generator Tube Rupture Analysis ML15118A4592015-05-19019 May 2015 Request for Additional Information Regarding Alternative Request ML15118A3802015-05-0505 May 2015 Request for Additional Information Regarding Snubber Program Alternative Request ML15076A1182015-04-13013 April 2015 Request for Additional Information Regarding License Basis Changes in Steam Generator Tube Rupture Analysis ML15079A0992015-03-26026 March 2015 Request for Additional Information ML14339A0302015-01-0909 January 2015 Request for Additional Information Regarding License Basis Changes in Steam Generator Tube Rupture Analysis ML14268A5162014-10-23023 October 2014 Request for Additional Information Associated with Near-Term Task Force Recommendation 2.1, Seismic Re-evaluation Related to Southeastern Catalog Changes 2024-08-19
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Text
From: Mahoney, Michael To: "MOORE, MICHAEL S" Cc: BENNETT, BRUCE ALLEN
Subject:
Summer TS 4.3.3.6 SR LAR - Request for Additional Information Date: Wednesday, September 05, 2018 11:35:50 AM Attachments:
image002.png Michael, By letter dated August 24, 2018 (ADAMS Accession No. ML18236A383), as supplemented by letter dated August 31, 2018 (ADAMS Accession No. ML18243A392), Virgil C. Summer Nuclear Power Plant, Unit 1 (Summer) submitted a license amendment request (LAR) to change the surveillance interval of Technical Specification (TS) 4.3.3.6 from 18 to 19 months. The NRC staff has reviewed the application and, based upon this review, determined that additional information is needed to complete our review. Please provide a response on the docket by September 11, 2018. Extending the TS 4.3.3.6 required surveillance interval from 18 months to 19 months effectively means that the plant could operate the core exit thermocouple monitoring system for longer than previously assumed, without performing certain existing required surveillance actions. US NRC Generic Letter (GL) 91-04, Changes in Technical Specification Surveillance Intervals to Accommodate a 24-Month Fuel Cycle, dated April 2, 1991, provides US NRC guidance regarding what licensees should evaluate in support of a longer fuel cycle. Although there are several areas requiring review, instrument drift during the longer interval is the key consideration to be discussed here. Generic Letter 91-04 provides the following overview regarding instrument drift issues: Licensees must address instrument drift when proposing an increase in the surveillance interval for calibrating instruments that perform safety functions including providing the capability for safe shutdown. The effect of the increased calibration interval on instrument errors must be addressed because instrument errors caused by drift were considered when determining safety system setpoints and when performing safety analyses-Licensees must evaluate the effects of an increased calibration interval on instrument errors that exceed the assumptions of the safety analysis.
Instrument drift affects the capability of a system to perform its safety function and is a consideration for determining safety system setpoints.
The magnitude of instrument drift is also one of the uncertainties, when combined with all other instrument channel uncertainties, used to determine the required allowance for overall instrument loop accuracy to support the channel's designated design functions.
(i.e., the instrument channel must be sufficiently accurate to meet the requirements of each of the functions and applications the channel serves.) During calibration activities, the performance of the instrument channel is measured under calibration conditions to determine if the measured output of the channel has deviated beyond its expected performance.
This information is used in the decision making as to whether the channel has been found to be operable or inoperable from a technical specification standpoint, as well as whether it is sufficiently accurate to support the performance requirements for any non-technical specification functions.
Request for Additional Information (RAI)-1 Based on the information provided in the license amendment, the staff determined that the licensee did not demonstrate there is no adverse impact of the increased channel drift uncertainty on the current licensing basis allowances assumed in the channel accuracy calculations.
Specifically, the license amendment does not quantify the estimated additional drift uncertainty associated with the requested surveillance extension.
This information is necessary to assess its impact on the existing design basis. Such information is needed to determine whether the overall loop accuracy assumptions continue to be protected.
This additional information is requested to support compliance with 10 CFR 50.36(c)(3).
Addressing regulatory guide (RG) 1.105, and GL 91-04 provides one acceptable approach for meeting regulatory requirements associated with instrument channel performance.
a) Provide a summary of the methodology used for establishing the limiting instrument loop uncertainty associated with the design functions served by these core exit temperature monitoring channels.
b) Describe the methodology used and the limiting acceptable calibration tolerance for periodic surveillance testing. Indicate whether there are any related Analytical Limits (AL) or other limiting design values (and the sources of these values) that may serve as the basis for any protective setpoints associated with the design functions served by the instrument channels affected by the LAR. c) Provide evidence that adequate margin exists to accommodate the additional drift within the design basis.(Note: The licensee can provide a loop accuracy calculation summary identifying the limiting loop uncertainty values needed to support the required design functions, or methodology summary and calculation summary, if applicable, in lieu of calculation.)
RAI-2 Section 50.36(c)(3) of 10 CFR Part 50 states: "Surveillance requirements are requirements relating to test, calibration, or inspection to assure that the necessary quality of systems and components is maintained, that facility operation will be within safety limits, and that the limiting conditions for operation will be met."Please provide a summary of the determination of the expected instrument channel drift calculated to be present at the end of the 19 month + 25% interval. RAI-3 On page 5 of the LAR, it is stated: Historical review of the last two performances of this surveillance have shown that 6 of 24 and 7 of 24 thermocouples were required to be adjusted back into tolerance due to as found values being out of tolerance.
Therefore 18 and 17 thermocouples, respectively, were in tolerance and would have remained operable if no adjustment were performed.
a) Provide the recorded "As-Found" and "As-Left" values from the last surveillances associated with these core exit temperature monitoring channels. b) UFSAR Section 7.5.5 states, in part, "The Incore Temperature Monitoring System consists of 51 thermocouples positioned in the reactor vessel above the core to measure reactor coolant temperature at the fuel assembly outlets," explain why only 24 were surveilled during the last two surveillances.
RAI-4 If the surveillance frequency is increased one month, as proposed in the LAR, the thermocouple accuracy would be expected to incur additional drift. Given the number of core exit thermocouples found out of tolerance during performance of the last two surveillances, provide a discussion on the impact to the computed parameters (such as saturation margin, core relative fuel assembly power distribution, core enthalpy rise nuclear hot-channel factors, core radial tilting factors).
The discussion should consider both the assumed uncertainty as well as the actual as-found uncertainties during the last two performances of the surveillance and any additional drift that would be expected to occur during the proposed additional month, including the +25% grace period. Once this email is added to ADAMS, I will provide the accession number for your reference.
Thanks Mike Michael Mahoney McGuire and Catawba Project Manager, Division of Operating Reactor Licensing Office of Nuclear Reactor Regulation U. S. Nuclear Regulatory Commission Desk: (301)-415-3867 Email: Michael.Mahoney@NRC.GOV