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Category:E-Mail
MONTHYEARML24250A1062024-09-0606 September 2024 NRR E-mail Capture - Final RAI - Constellation Energy Generation, LLC - Fleet Request - Proposed Alternative to Utilize Code Case OMN-32 (L-2024-LLR-0030) ML24249A1362024-09-0404 September 2024 EN 57304 - Westinghouse Electric Company, LLC, Final Report - No Embedded Files. 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Constellation Energy Generation, LLC - Fleet Request - Acceptance of License Amendment Request to Adopt TSTF-591, Revision 0 ML23328A0132023-11-22022 November 2023 Supplement - Security Rule Exemption Request ISFSI Docket No. Reference (L-2023-LLE-0028) ML23304A0162023-10-30030 October 2023 NRR E-mail Capture - Final RCI - Constellation Energy Generation, LLC - LaSalle 1 & 2 - Exemption from Security Rule (L-2023-LLE-0028) ML23268A0022023-09-22022 September 2023 NRR E-mail Capture - Constellation Energy Generation, LLC - Fleet Request - Acceptance of License Amendment Request to Adopt TSTF-264-A, Revision 0 ML23264A7992023-09-21021 September 2023 NRR E-mail Capture - Final RAI - Constellation Energy Generation, LLC Fleet Request License Amendment Request to Adopt TSTF-580, Revision 1 ML23237B3972023-08-24024 August 2023 NRR E-mail Capture - Constellation Energy Generation, LLC - Fleet Request - Acceptance of Alternative Request to Use Updated BWRVIP Guidelines ML23163A2292023-06-12012 June 2023 NRR E-mail Capture - 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Lasalle 1 and 2 - (RAI) License Amendment Request Regarding New Fuel Storage Vault and Spent Fuel Storage Pool Criticality Methodologies, with Changes to TS Sections 4.3.1 and 5.6.5 (EPID-L-2021-LLA-0124) ML22126A0392022-05-0606 May 2022 NRR E-mail Capture - Lasalle 1 and 2 Draft (RAI) License Amendment Request Regarding New Fuel Storage Vault and Spent Fuel Storage Pool Criticality Methodologies, with Proposed Changes to TS Sections 4.3.1 and 5.6.5 ML22066A7622022-03-0707 March 2022 NRR E-mail Capture - Verbal Authorization - EPID-L-2022-LLR-0028, LaSalle Unit 1 Request for Alternative Examination for Repairs of Flow Control Valves 1B33-F060A and 1B33-F060B ML22062B0232022-03-0303 March 2022 NRR E-mail Capture - EPID-L-2022-LLR-0028, LaSalle Unit 1, Request for Additional Information (Rai), LaSalle Unit 1, Relief Request I4R-13 Relief from Code Examinations for 1B33-F060A and 1B33-F060B Repairs ML22041B5362022-02-10010 February 2022 NRR E-mail Capture - Constellation Energy Generation, LLC - 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Exelon Generation Company, LLC - Fleet Alternative Request for Repair of Water Level Instrumentation Partial Penetration Nozzles ML21215A3502021-08-0303 August 2021 NRR E-mail Capture - Exelon Generation Company, LLC - Acceptance of License Amendment Request to Adopt TSTF-554 ML21210A0942021-07-29029 July 2021 NRR E-mail Capture - La Salle, 1 & 2 - Acceptance of Licensing Action License Amendment Request New Fuel Storage Vault and Spent Fuel Pool Criticality Methodologies, with Changes to TS Sections 4.3.1 and 5.6.5 (EPID-L-2021-LLA-0124) ML21207A0072021-07-26026 July 2021 NRR E-mail Capture - La Salle Units 1 and 2 - Request for Additional Information (RAI) License Amendment Request to Incorporate Licensing Topical Report NEDE-33885P-A, Revision 1, GNF CRDA Application Methodology(EPID-L-2021-LLA-0016) ML21190A0192021-07-0808 July 2021 NRR E-mail Capture - Exelon Fleet - Request for Additional Information Regarding Adoption of TSTF-582 and TSTF-583-T ML21154A0132021-05-28028 May 2021 NRR E-mail Capture - Extension of Comment Period for the Exelon Generation Company, LLC License Transfer Application ML21154A0142021-05-28028 May 2021 NRR E-mail Capture - Extension of Comment Period for the Exelon Generation Company, LLC License Transfer Application ML21154A0112021-05-28028 May 2021 NRR E-mail Capture - Extension of Comment Period for the Exelon Generation Company, LLC License Transfer Application ML21144A2132021-05-24024 May 2021 NRR E-mail Capture - Exelon Generation Company, LLC - Request for Additional Information Regarding License Transfer Application ML21120A0552021-04-29029 April 2021 NRR E-mail Capture - LaSalle County Station, Units 1 and 2 - Closeout of Bulletin 2012-01, Design Vulnerability in Electric Power System ML21119A2282021-04-29029 April 2021 NRR E-mail Capture - Request for Additional Information (RAI) - LaSalle, EPID-L-2020-LLA-0018, License Amendment Request (LAR) TSTF-505 ML21117A0442021-04-26026 April 2021 NRR E-mail Capture - Exelon Generation Company, LLC - Proposed Fleet Alternative to Documentation Requirements for Pressure Retaining Bolting ML21089A0562021-03-30030 March 2021 NRR E-mail Capture - LaSalle Unit 2 - Verbal Authorization of LaSalle Unit 2 Request for an Alternative I4R-12, Revision 2 Valve Repairs on Valves 2B33-F060A and 2B33-F060B ML21084A2532021-03-24024 March 2021 NRR E-mail Capture - Exelon Generation Company, LLC - Acceptance of License Transfer Application 2024-09-06
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From: Stephen Sands Sent: Monday, March 09, 2009 4:14 PM To: 'timothy.byam@exeloncorp.com'
Subject:
Follow-on RAIs with respect to LPRM amendment request Tim, This e-mail is to inform Exelon Generation Company (Exelon) that the questions below are being placed in the Agencywide Document Access and Management System (ADAMS) as an official record transmitting additional information the NRC staff is requesting. In order for the NRC staff to continue with the review, it is requested that your responses be sent within 30 days from the e-mail transmitting these questions. The additional questions below were supplied by the NRC technical review staff after reviewing Exelon's response to the NRC staff initial request for additional information (RAI), dated February 17, 2009.
Stephen Sands Division of Operating Reactors Clinton & LaSalle Project Manager Licensing Project Branch 3-2 Phone: 301-415-3154 E-mail: Stephen.Sands@nrc.gov SRXB-1 RAI-1 requested the licensee to provide an uncertainty analysis using decay constants specific to the LRPM detectors at the LSCS. The results should demonstrate that the uncertainties based on a fixed decay factor bound that based on the LRPM specific decay factors for the LSCS. In the response, the licensee did not provide the requested analysis. Instead, it summarized the results of its analysis and indicated that: (1) the analysis used in support of the LAR was based on a fixed decay factor of -.0092, which is based on manufacture's data; and (2) the decay constant used in the CMS will be adjusted to -0.100 to assure that the evaluated LPRM uncertainty is within the bounds of SLMCPR analysis.
With the results of the analysis with the fixed decay constants of either -0.0092 or -.0.100, the NRC staff is not sure whether the results are adequate to represent the actual data with values of the decay constants specific to various LRPM detectors at the LSCS. To resolve this RAI satisfactorily, the licensee should provide a discussion or an analysis (such as the requested detector specific decay constant analysis) to show that the assumption used in the analysis in support of the LAR is valid, i.e., the uncertainties based on a fixed decay factor bound that based on the LRPM specific decay factors for the LSCS. If the licensee uses an existing analysis to support the RAI response, it should address applicability of the existing analysis to the LAR. The RAI response should identify the effects of any plant specific deviations, such as the LRPM exposure data that may be collected from different models of LRPM detectors, or methods for the uncertainty analysis that may be based on different ranges of the LRPM exposures to represent a nominal exposure value.
SRXB-2 In the RAI-2 response, the licensee indicated that it would modify the decay constant to -0.100 in its CMS so that the evaluated LPRM uncertainty is within the bounds of the SLMCPR analysis.
Discuss adequacy of the use of the LPRM uncertainty in the SLMCPR to bound the evaluated LPRM uncertainty, which is the difference between standard deviations (underlined for emphasis) calculated at two different exposure intervals (i.e., 1000 MWd/MTU and 2675 MWd/MTU). If applicable, clarify that the LRPM uncertainty limit used in the SLMCPR analysis is the maximum value of one standard deviation (which captures 67% of the data points) allowed for the relative LRPM errors. Explain that the LRPM uncertainty limit is appropriately used in the SLMCPR analysis to assure that the determined SLMCPR is the core-wide critical power ratio at which 99.9% (equivalent to more than 3 standard deviations) of the fuel rods would not be expected to experience boiling transition during normal condition.
SRXB-3 In the RAI-3 response, the licensee indicated that a 3D nodal simulator was used to calculate the accumulated exposure values.
Identify the name of the simulator (or computer code) if it has one, and discuss acceptability of the simulator used for determination of accumulated exposure values. If the simulator was previously approved by the NRC, reference the title and the date of the safety evaluation report that approved the simulator for licensing applications.