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| | number = ML18166A187 | | | number = ML18166A187 |
| | issue date = 06/14/2018 | | | issue date = 06/14/2018 |
| | title = EPID-L-2018-LLR-0012, LAR CSCS, Request for Additional Information (RAI) | | | title = NRR E-mail Capture - LaSalle 1 and 2, EPID-L-2018-LLR-0012, LAR CSCS, Request for Additional Information (RAI) |
| | author name = Vaidya B | | | author name = Vaidya B |
| | author affiliation = NRC/NRR/DORL/LPLIII | | | author affiliation = NRC/NRR/DORL/LPLIII |
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| =Text= | | =Text= |
| {{#Wiki_filter:Code of Federal RegulationsDesign bases for protection against natural phenomena,}} | | {{#Wiki_filter:NRR-DMPSPEm Resource From: Vaidya, Bhalchandra Sent: Thursday, June 14, 2018 2:27 PM To: david.gullott@exeloncorp.com; Sprengel, Ryan:(GenCo-Nuc) |
| | |
| | ==Subject:== |
| | LaSalle 1 and 2, EPID-L-2018-LLR-0012, LAR RE: CSCS, Request for Additional Information (RAI) |
| | |
| | ==Subject:== |
| | LaSalle County Station, Units 1 and 2 - License Amendment Request for Temporary Extensions to Technical Specifications Supporting Maintenance on Portions of the Core Standby Cooling System. |
| | EPID- L-2018-LLA-0012 (CAC NOS. 000976/05000373/ L-2018-LLA-0012, and 000976/05000374/ L-2018-LLA-0012) |
| | Docket Nos. 50-373 and 50-374 David and Ryan, By application dated January 24, 2018 (Agencywide Documents Access and Management System (ADAMS) Accession No. ML18024A275), Exelon Generation Company, LLC (EGC), the licensee requested an amendment to Renewed Facility Operating License Nos. NPF-11 and NPF-18 for LaSalle County Station (LSCS), Units 1 and 2, respectively. The license amendment request (LAR) is related to temporary extensions to technical specifications supporting maintenance on portions of the core standby cooling system. The proposed changes modify Technical Specifications (TSs) 3.7.2, "Diesel Generator Cooling Water (DGCW) System," 3.8.1, "AC Sources-Operating" and the associated TS Bases. The proposed changes allow an extended period to install isolation valves to support replacing degraded Core Standby Cooling System piping. |
| | The NRC staff has determined that additional information is necessary to complete its review regarding the requested amendment. |
| | The NRC Staffs request for additional information (RAIs) are provided below: |
| | ==================================================================== |
| | REQUEST FOR ADDITIONAL INFORMATION BY THE CONTAINMENT AND PLANT SYSTEMS BRANCH LICENSE AMENDMENT REQUEST FOR TEMPORARY EXTENSIONS TO TECHNICAL SPECIFICATIONS SUPPORTING MAINTENANCE ON PORTIONS OF THE CORE STANDBY COOLING SYSTEM EXELON GENERATION - LASALLE COUNTY STATION, UNITS 1 AND 2 DOCKET NOS. 50-373 and 50-374 EPID Number L-2018-LLA-0012 RAI- SCPB 1 Applicable Regulatory Requirements Appendix A, General Design Criteria for Nuclear Power Plants, to Title 10 of the Code of Federal Regulations (10 CFR) |
| | Part 50, General Design Criterion (GDC) 2, Design bases for protection against natural phenomena, states: |
| | Structures, systems, and components important to safety shall be designed to withstand the effects of natural phenomena such as earthquakes, tornadoes, hurricanes, floods, tsunami, and seiches without loss of capability to perform their safety functions. The design bases for these structures, systems, and components shall reflect: (1) |
| | Appropriate consideration of the most severe of the natural phenomena that have been historically reported for the site and surrounding area, with sufficient margin for the limited accuracy, quantity, and period of time in which the historical data have been accumulated, (2) appropriate combinations of the effects of normal and accident conditions with the effects of the natural phenomena and (3) the importance of the safety functions to be performed. |
| | 10 CFR Part 50.36, "Technical specifications," establish the requirements related to the content of the TSs. Section 50.36(c)(2)(ii) states: |
| | Limiting conditions for operation. Limiting conditions for operation are the lowest functional capability or performance levels of equipment required for safe operation of the facility. When a limiting condition for operation of a nuclear reactor is not met, the licensee shall shut down the reactor or follow any remedial action permitted by the technical specifications until the condition can be met. |
| | Issue The licensee stated: |
| | The portion of DGCW return piping to be replaced is directly connected to the lake and below normal cooling lake level, replacement will require isolation. Isolation will be accomplished by hot tapping, installing temporary line stops (stopples), and then installing new isolation valves. |
| | 1 |
| | |
| | The associated carbon steel piping surfaces and the nature of impurities in lake water could make leak tight seating of the stops difficult. Additionally, the hot tap hardware during the hot tap process would add temporary additional seismic weight and moment loads to the pipe and pipe joints. |
| | Request for Additional Information a) Identify and discuss the possible impact on plant safety caused by expected leakage past the line stops. |
| | b) What precautions will be needed and implemented to mitigate the effects of leakage? |
| | c) Considering the added weight and moment of the hot tap hardware, what actions will be taken or analysis will be performed to ensure plant safety during a seismic event, including a seismic induced loss of offsite power? |
| | d) Since the pipes to be replaced are not isolable and below lake level, what contingency plans are there to combat flooding caused by possible gross failure of line stops or pipe? |
| | =================================================================== |
| | Subsequent to the discussion with your staff on June 14, 2018, you have provided the confirmed date of response as COB July 16, 2018. |
| | The NRC staff considers that timely responses to requests for additional information help ensure sufficient time is available for staff review and contribute toward the NRCs goal of efficient and effective use of staff resources. |
| | If you have any questions, please contact me at (301) 415-3308. |
| | Bhalchandra K. Vaidya Licensing Project Manager NRC/NRR/DORL/LPL3 (301)-415-3308 (O) bhalchandra.vaidya@nrc.gov 2 |
| | |
| | Hearing Identifier: NRR_DMPS Email Number: 418 Mail Envelope Properties (Bhalchandra.Vaidya@nrc.gov20180614142600) |
| | |
| | ==Subject:== |
| | LaSalle 1 and 2, EPID-L-2018-LLR-0012, LAR RE: CSCS, Request for Additional Information (RAI) |
| | Sent Date: 6/14/2018 2:26:57 PM Received Date: 6/14/2018 2:26:00 PM From: Vaidya, Bhalchandra Created By: Bhalchandra.Vaidya@nrc.gov Recipients: |
| | "david.gullott@exeloncorp.com" <david.gullott@exeloncorp.com> |
| | Tracking Status: None "Sprengel, Ryan:(GenCo-Nuc)" <Ryan.Sprengel@exeloncorp.com> |
| | Tracking Status: None Post Office: |
| | Files Size Date & Time MESSAGE 5407 6/14/2018 2:26:00 PM Options Priority: Standard Return Notification: No Reply Requested: No Sensitivity: Normal Expiration Date: |
| | Recipients Received:}} |
|
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Category:E-Mail
MONTHYEARML24197A0162024-07-12012 July 2024 NRR E-mail Capture - Final RAI - Constellation Energy Generation, LLC - Fleet Request - License Amendment Request to Adopt TSTF-591 ML24156A0082024-05-31031 May 2024 NRR E-mail Capture - Constellation Energy, LLC - Fleet Request - Acceptance of Proposed Alternative Concerning Extension of Permanent Relief from Ultrasonic Examination of Reactor Pressure Vessel Circumferential Shell Welds (L-2024-LLR-0031 ML24131A0612024-05-10010 May 2024 NRR E-mail Capture - Constellation Energy Generation, LLC - Fleet Request - Acceptance of Proposed Alternative to Utilize Code Case OMN-32 (L-2024-LLR-0030) ML24122B5072024-05-0101 May 2024 NRR E-mail Capture - 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 - Constellation Energy Generation, LLC - Fleet Request - Acceptance of License Amendment Request to Adopt TSTF-580, Revision 1 ML23153A1562023-06-0202 June 2023 NRR E-mail Capture - RAI LaSalle pressure-temperature Limits Report (PTLR) Amendment Request ML23151A6602023-05-31031 May 2023 NRR E-mail Capture - LaSalle County Station, Units 1 and 2 - Acceptance of I4R-14 ML23150A2482023-05-25025 May 2023 NRR E-mail Capture - RAI Re LaSalle Downcomer Analysis Amendment Request ML23095A1892023-04-0505 April 2023 NRR E-mail Capture - LaSalle County Station, Units 1 and 2 - Audit Plan PTLR Amendment Request ML23074A0372023-03-14014 March 2023 NRR E-mail Capture - (External_Sender) Implementation of Exigent Amendment ML23044A0452023-02-13013 February 2023 NRR E-mail Capture - LaSalle County Station, Units 1 and 2 - Acceptance of Requested Licensing Action License Amendment Request to Revise Lower Downcomer Braces Analysis ML23046A1132023-02-13013 February 2023 Transmittal Email, Paul Bessette to Gibson, 2/13/23, Filing of Formal Opposition to PG&E Exemption Request ML23052A2042023-01-10010 January 2023 E-mail from Paul Bessette Dated 01/10/2023 Regarding Diablo Canyon ML22357A0382022-12-23023 December 2022 NRR E-mail Capture - LaSalle County Station, Units 1 and 2 - Acceptance of Requested Licensing Action License Amendment Request to Relocate the Pressure and Temperature Limit Curves ML22354A2622022-12-20020 December 2022 NRR E-mail Capture - Constellation Energy Generation, LLC - Fleet Request - Acceptance of Request to Use Certain Provisions of the 2019 Edition of the ASME BPV Code, Section XI ML22301A0902022-10-28028 October 2022 NRR E-mail Capture - Constellation Energy Generation, LLC - Fleet Request - Acceptance of License Amendment Request to Adopt TSTF-301, Revision 2 ML22256A0112022-09-12012 September 2022 NRR E-mail Capture - Request for Additional Information LaSalle County Station, Units 1 and 2 and Quad Cities Nuclear Power Station, Units 1 and 2 License Amendments Related to Fuel Storage ML22200A0782022-07-19019 July 2022 NRR E-mail Capture - Constellation Energy Generation, LLC - Fleet Request to Use Honeywell Mururoa V4F1 R Supplied Air Suits ML22138A4112022-05-18018 May 2022 NRR E-mail Capture - 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 - Request for Additional Information Regarding Fleet License Amendment Request to Adopt TSTF-541 ML22020A0692022-01-14014 January 2022 NRR E-mail Capture - (External_Sender) IEMA Response: State Consultation - LaSalle 1 and 2: License Amendment Request Re; Revision of Technical Specifications to Incorporate GNF CRDA Methodology ML22020A0642022-01-13013 January 2022 NRR E-mail Capture - Exelon Generation Company, LLC - Request for Additional Information Regarding Proposed Fleet Alternative for Repair of Water Level Instrumentation Partial Penetration Nozzles ML21361A2982021-12-0606 December 2021 NRR E-mail Capture - (External_Sender) Control Rod Drop Accident (CRDA) Implementation Schedule ML21301A0672021-10-28028 October 2021 NRR E-mail Capture - Exelon Generation Company, LLC - Acceptance of License Amendment Request to Adopt TSTF-541 ML21256A1902021-09-10010 September 2021 NRR E-mail Capture - Exelon Generation Company, LLC - Request for Additional Information Regarding License Transfer Application ML21252A0482021-09-0707 September 2021 NRR E-mail Capture - 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 ML21084A1292021-03-22022 March 2021 NRR E-mail Capture - Delay in Issuance of the LaSalle TSTF-505 LAR (L-2020-LLA-0018) ML21082A0252021-03-22022 March 2021 Email to Licensee for Delay in Completion of LAR LAR TSTF-505 ML21077A1902021-03-18018 March 2021 NRR E-mail Capture - Lasalle Units 1 and 2 - Request for Additional Information (RAI) Request for License Amendment Regarding Ultimate Heat Sink, (EPID-L-2020-LLA-0165) 2024-07-12
[Table view] Category:Request for Additional Information (RAI)
MONTHYEARML24197A0162024-07-12012 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 ML23360A6082023-12-27027 December 2023 County Station Request for Information for NRC Commercial Grade Dedication Inspection: Inspection Report 05000373/2024010 and 05000374/2024010 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 ML23208A3182023-07-27027 July 2023 Notification of an NRC Biennial Licensed Operator Requalification Program Inspection and RFI ML23153A1562023-06-0202 June 2023 NRR E-mail Capture - RAI LaSalle pressure-temperature Limits Report (PTLR) Amendment Request ML23150A2482023-05-25025 May 2023 NRR E-mail Capture - RAI Re LaSalle Downcomer Analysis Amendment Request ML23110A3202023-04-21021 April 2023 Information Request to Support the NRC Annual Baseline Emergency Action Level and Emergency Plan Changes Inspection ML22361A0792022-12-27027 December 2022 Notification of NRC Baseline Inspection and Request for Information (05000374/2023001) ML22256A0112022-09-12012 September 2022 NRR E-mail Capture - Request for Additional Information LaSalle County Station, Units 1 and 2 and Quad Cities Nuclear Power Station, Units 1 and 2 License Amendments Related to Fuel Storage ML22138A4112022-05-18018 May 2022 NRR E-mail Capture - 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 ML22097A0832022-04-0707 April 2022 County Station Information Request for the Cyber-Security Baseline Inspection, Notification to Perform Inspection 05000373/2022403 and 05000374/2022403 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 - Request for Additional Information Regarding Fleet License Amendment Request to Adopt TSTF-541 ML22020A0642022-01-13013 January 2022 NRR E-mail Capture - Exelon Generation Company, LLC - Request for Additional Information Regarding Proposed Fleet Alternative for Repair of Water Level Instrumentation Partial Penetration Nozzles ML21292A1782021-10-19019 October 2021 Information Request for a NRC Post-Approval Site Inspection for License Renewal 05000373/2022010 ML21256A1902021-09-10010 September 2021 NRR E-mail Capture - Exelon Generation Company, LLC - Request for Additional Information Regarding License Transfer Application 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 ML21187A2972021-07-0707 July 2021 Information Request for an NRC Triennial 10 CFR 50.59 (Evaluation of Changes, Tests, and Experiments) Baseline Inspection 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 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 ML21077A1902021-03-18018 March 2021 NRR E-mail Capture - Lasalle Units 1 and 2 - Request for Additional Information (RAI) Request for License Amendment Regarding Ultimate Heat Sink, (EPID-L-2020-LLA-0165) ML21068A2762021-03-0909 March 2021 NRR E-mail Capture - La Salle Units 1 and 2 - Request for Additional Information (RAI) Relief Request I4R-12 Relief from Code Surface Examinations for 2B33-F060B Valve Repair (EPID-L-2020-LLA-0016) ML21067A6752021-03-0808 March 2021 NRR E-mail Capture - La Salle Units 1 and 2 - Request for Additional Information (RAI) UHS Amendment Request (EPID-L-2020-LLA-0165) ML21060B4352021-03-0101 March 2021 NRR E-mail Capture - Second Round - Request for Additional Information (Rais) EPID-L-2020-LLA-0018, LaSalle License Amendment Request to Adopt Risk Informed Completion Times TSTF-505, Revision 2 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 ML21053A0252021-02-20020 February 2021 NRR E-mail Capture - Request for Additional Information (Rais) - LaSalle Request for Exemption from Pre-Access Drug and Alcohol Testing 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) ML21048A0432021-02-16016 February 2021 County Station - Notification of NRC Design Bases Assurance Inspection (Programs) and Initial Request for Information - Inspection Report 05000373/2021011 and 05000374/2021011 ML20364A2452020-12-29029 December 2020 Notification of an NRC Triennial Heat Sink Performance Inspection and Request for Information; Inspection Report 05000373/2021002; 05000374/2021002 ML20346A1042020-12-11011 December 2020 NRR E-mail Capture - LaSalle County Station, Units 1 and 2 - Request for Additional Information Regarding the License Amendment Request to Adopt 10 CFR 50.69 ML20330A1892020-11-25025 November 2020 Request for Information for an NRC Post-Approval Site Inspection for License Renewal; Inspection Report 05000374/2021010 ML20321A0852020-11-16016 November 2020 Notification of NRC Baseline Inspection and Request for Information (05000374/2021001) ML20247J4082020-09-29029 September 2020 Apla Request for Additional Information LAR 50.69 and TSTF-505 (Epids L-2020-LLA-0017) and ML20253A3422020-09-17017 September 2020 Correction to Request for Additional Information Request to Adopt 10 CFR 50.69, Risk-Informed Categorization and Treatment of Structures, Systems, and Components for Nuclear Power Reactors (EPID-2020-LLA-0017) ML20253A2272020-09-16016 September 2020 Correction to Request for Additional Information Application to Adopt Risk-Informed Completion Times TSTF-505, Revision 2, Provide Risk-Informed Extended Completion Times - RITSTF Initiative 4b ML20240A2182020-09-0303 September 2020 Request for Additional Information Regarding Amendment Request for Amendments to Renewed Facility Operating Licenses to Adopt 10 CFR 50.69, Risk-Informed Categorization and Treatment of Structures, Systems, and Co ML20239A7262020-08-27027 August 2020 Supplemental Information Needed for Acceptance of Requested Licensing Action Regarding Request for a License Amendment to Technical Specification 3.7.3, Ultimate Heat Sink ML20239A7982020-08-25025 August 2020 NRR E-mail Capture - Exelon Generation Company, LLC - Fleet License Amendment Request to Adopt TSTF-568, Revision 2 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 ML19179A0612019-07-19019 July 2019 Three Mile Point 1 - Supplemental Information Needed to Proposed Alternative to Use ASME Code Case N-879 ML19120A2302019-04-29029 April 2019 Ltr. 04/29/19 LaSalle County Station, Units 1 and 2 - Request for Information for an NRC Triennial Baseline Design Bases Assurance Inspection (Team); Inspection Report 05000373/2019012; 05000374/2019012 (DRS-M.Jones) ML19087A2682019-03-28028 March 2019 NRR E-mail Capture - Request for Additional Information (RAI) - LaSalle 1 and 2, EPID-L-2018-LLA-0162, LAR Removal of Operating Mode Restrictions for Performing Surveillance Testing of the Div 3 Battery and HPCS DG ML19065A0902019-03-0505 March 2019 NRR E-mail Capture - LaSalle 1 and 2, EPID-L-2018-LLR-0162, LAR Removal of Operating Mode Restrictions for Performing Surveillance Testing of the Div 3 Battery and HPCS DG, Additional Draft Request for Additional Information (RAI) ML19058A2392019-02-27027 February 2019 Information Request to Support Upcoming Problem Identification and Resolution Inspection at LaSalle County Station, Units 1 and 2 ML19036A6562019-02-0505 February 2019 NRR E-mail Capture - LaSalle 1 and 2, EPID-L-2018-LLR-0123, Relief Request I3R-15, Third Inservice Inspection Interval, Request for Additional Information (RAI) ML19022A2552019-01-22022 January 2019 NRR E-mail Capture - LaSalle Units 1 and 2, EPID-L-2018-LLA-0035, Amendment Request to Adopt TSTF-334-A, Status of Revised Draft RAIs Sent to You on December 13, 2018 2024-07-12
[Table view] |
Text
NRR-DMPSPEm Resource From: Vaidya, Bhalchandra Sent: Thursday, June 14, 2018 2:27 PM To: david.gullott@exeloncorp.com; Sprengel, Ryan:(GenCo-Nuc)
Subject:
LaSalle 1 and 2, EPID-L-2018-LLR-0012, LAR RE: CSCS, Request for Additional Information (RAI)
Subject:
LaSalle County Station, Units 1 and 2 - License Amendment Request for Temporary Extensions to Technical Specifications Supporting Maintenance on Portions of the Core Standby Cooling System.
EPID- L-2018-LLA-0012 (CAC NOS. 000976/05000373/ L-2018-LLA-0012, and 000976/05000374/ L-2018-LLA-0012)
Docket Nos. 50-373 and 50-374 David and Ryan, By application dated January 24, 2018 (Agencywide Documents Access and Management System (ADAMS) Accession No. ML18024A275), Exelon Generation Company, LLC (EGC), the licensee requested an amendment to Renewed Facility Operating License Nos. NPF-11 and NPF-18 for LaSalle County Station (LSCS), Units 1 and 2, respectively. The license amendment request (LAR) is related to temporary extensions to technical specifications supporting maintenance on portions of the core standby cooling system. The proposed changes modify Technical Specifications (TSs) 3.7.2, "Diesel Generator Cooling Water (DGCW) System," 3.8.1, "AC Sources-Operating" and the associated TS Bases. The proposed changes allow an extended period to install isolation valves to support replacing degraded Core Standby Cooling System piping.
The NRC staff has determined that additional information is necessary to complete its review regarding the requested amendment.
The NRC Staffs request for additional information (RAIs) are provided below:
========================================================
REQUEST FOR ADDITIONAL INFORMATION BY THE CONTAINMENT AND PLANT SYSTEMS BRANCH LICENSE AMENDMENT REQUEST FOR TEMPORARY EXTENSIONS TO TECHNICAL SPECIFICATIONS SUPPORTING MAINTENANCE ON PORTIONS OF THE CORE STANDBY COOLING SYSTEM EXELON GENERATION - LASALLE COUNTY STATION, UNITS 1 AND 2 DOCKET NOS. 50-373 and 50-374 EPID Number L-2018-LLA-0012 RAI- SCPB 1 Applicable Regulatory Requirements Appendix A, General Design Criteria for Nuclear Power Plants, to Title 10 of the Code of Federal Regulations (10 CFR)
Part 50, General Design Criterion (GDC) 2, Design bases for protection against natural phenomena, states:
Structures, systems, and components important to safety shall be designed to withstand the effects of natural phenomena such as earthquakes, tornadoes, hurricanes, floods, tsunami, and seiches without loss of capability to perform their safety functions. The design bases for these structures, systems, and components shall reflect: (1)
Appropriate consideration of the most severe of the natural phenomena that have been historically reported for the site and surrounding area, with sufficient margin for the limited accuracy, quantity, and period of time in which the historical data have been accumulated, (2) appropriate combinations of the effects of normal and accident conditions with the effects of the natural phenomena and (3) the importance of the safety functions to be performed.
10 CFR Part 50.36, "Technical specifications," establish the requirements related to the content of the TSs. Section 50.36(c)(2)(ii) states:
Limiting conditions for operation. Limiting conditions for operation are the lowest functional capability or performance levels of equipment required for safe operation of the facility. When a limiting condition for operation of a nuclear reactor is not met, the licensee shall shut down the reactor or follow any remedial action permitted by the technical specifications until the condition can be met.
Issue The licensee stated:
The portion of DGCW return piping to be replaced is directly connected to the lake and below normal cooling lake level, replacement will require isolation. Isolation will be accomplished by hot tapping, installing temporary line stops (stopples), and then installing new isolation valves.
1
The associated carbon steel piping surfaces and the nature of impurities in lake water could make leak tight seating of the stops difficult. Additionally, the hot tap hardware during the hot tap process would add temporary additional seismic weight and moment loads to the pipe and pipe joints.
Request for Additional Information a) Identify and discuss the possible impact on plant safety caused by expected leakage past the line stops.
b) What precautions will be needed and implemented to mitigate the effects of leakage?
c) Considering the added weight and moment of the hot tap hardware, what actions will be taken or analysis will be performed to ensure plant safety during a seismic event, including a seismic induced loss of offsite power?
d) Since the pipes to be replaced are not isolable and below lake level, what contingency plans are there to combat flooding caused by possible gross failure of line stops or pipe?
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Subsequent to the discussion with your staff on June 14, 2018, you have provided the confirmed date of response as COB July 16, 2018.
The NRC staff considers that timely responses to requests for additional information help ensure sufficient time is available for staff review and contribute toward the NRCs goal of efficient and effective use of staff resources.
If you have any questions, please contact me at (301) 415-3308.
Bhalchandra K. Vaidya Licensing Project Manager NRC/NRR/DORL/LPL3 (301)-415-3308 (O) bhalchandra.vaidya@nrc.gov 2
Hearing Identifier: NRR_DMPS Email Number: 418 Mail Envelope Properties (Bhalchandra.Vaidya@nrc.gov20180614142600)
Subject:
LaSalle 1 and 2, EPID-L-2018-LLR-0012, LAR RE: CSCS, Request for Additional Information (RAI)
Sent Date: 6/14/2018 2:26:57 PM Received Date: 6/14/2018 2:26:00 PM From: Vaidya, Bhalchandra Created By: Bhalchandra.Vaidya@nrc.gov Recipients:
"david.gullott@exeloncorp.com" <david.gullott@exeloncorp.com>
Tracking Status: None "Sprengel, Ryan:(GenCo-Nuc)" <Ryan.Sprengel@exeloncorp.com>
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