Letter Sequence RAI |
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Initiation
- Request, Request, Request, Request, Request, Request, Request, Request, Request, Request, Request, Request
- Acceptance, Acceptance, Acceptance
- Supplement, Supplement, Supplement, Supplement, Supplement
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MONTHYEARAEP-NRC-2020-59, For Donald C. Cook Nuclear Plant (CNP) Unit 2 - Report Per Technical Specification 5.6.6, Lnoperability of Unit 2, Post Accident Monitoring, Containment Water Level2020-08-27027 August 2020
For Donald C. Cook Nuclear Plant (CNP) Unit 2 - Report Per Technical Specification 5.6.6, Lnoperability of Unit 2, Post Accident Monitoring, Containment Water Level
Project stage: Request
AEP-NRC-2020-76, Report Per Technical Specification 5.6.6, Inoperability of Unit 1, Post Accident Monitoring, Containment Water Level2020-11-24024 November 2020
Report Per Technical Specification 5.6.6, Inoperability of Unit 1, Post Accident Monitoring, Containment Water Level
Project stage: Request
AEP-NRC-2021-07, Supplement to Report Per Technical Specification 5.6.6, Lnoperability of Unit 1, Post Accident Monitoring, Containment Water Level2021-01-28028 January 2021
Supplement to Report Per Technical Specification 5.6.6, Lnoperability of Unit 1, Post Accident Monitoring, Containment Water Level
Project stage: Request
ML21090A1852021-03-31031 March 2021
Request for License Amendment and Regulatory Exemptions for a Risk-Informed Approach to Address GSI-191 and Respond to GL 2004-02 (LDCN 19-0014)
Project stage: Request
ML21125A0452021-05-0404 May 2021
NRR E-mail Capture - LIC-109 Acceptance Review (Unacceptable for Review with Opportunity to Supplement) - Callaway Plant, Unit 1 - License Amendment Request - Final Resolution to Address Concerns of GSI-191 - EPID L-2021-LLA-0059
Project stage: Acceptance Review
ML21130A5882021-05-11011 May 2021
Supplemental Information Needed for Acceptance of Requested Licensing Actions to Adopt a Risk-Informed Approach to Address GSI-191 and Respond to Generic Letter 2004 02
Project stage: Acceptance Review
ULNRC-06664, Supplement to Request for License Amendment and Regulatory Exemptions for a Risk-Informed Approach to Address GSI-191 and Respond to GL 2004-02 (LDCN 19-0014)2021-05-27027 May 2021
Supplement to Request for License Amendment and Regulatory Exemptions for a Risk-Informed Approach to Address GSI-191 and Respond to GL 2004-02 (LDCN 19-0014)
Project stage: Supplement
ML21160A1482021-06-10010 June 2021
Acceptance of Requested Licensing Actions License Amendment and Regulatory Exemptions for a Risk Informed Approach to Address Generic Safety Issue 191 and Respond to Generic Letter 2004-02
Project stage: Acceptance Review
ML21203A1932021-07-22022 July 2021
Request for License Amendment and Regulatory Exemptions for a Risk-Informed Approach to Address GSI-191 and Respond to GL-2004-02 (LDCN 19-0014)
Project stage: Request
ML21203A1922021-07-22022 July 2021
Request for License Amendment and Regulatory Exemptions for a Risk-Informed Approach to Address GSI-191 and Respond to GL-2004-02 (LDCN 19-0014)
Project stage: Request
ML21197A0632021-07-23023 July 2021
Audit Plan and Setup of Online Reference Portal for License Amendment Request Risk-Informed Approach for Closure of Generic Safety Issue-191
Project stage: Other
ML21237A1352021-08-23023 August 2021
Amendment Request Regarding Risk-Informed Approach to Closure of Generic Safety Issue 191
Project stage: Request
ML21237A1362021-08-23023 August 2021
Amendment Request Regarding Risk-Informed Approach to Closure of Generic Safety Issue 191
Project stage: Other
ML21238A1382021-09-14014 September 2021
Audit Summary for License Amendment Request and Regulatory Exemptions for a Risk-Informed Approach to Address GSI-191 and Respond to GL 2004-02
Project stage: Other
ML21280A3782021-10-0707 October 2021
Third Supplement to Request for License Amendment and Regulatory Exemptions for a Risk-Informed Approach to Address GSI-191 and Respond to GL-2004-02 (LDCN 19-0014)
Project stage: Request
ML21280A3792021-10-0707 October 2021
Third Supplement to Request for License Amendment and Regulatory Exemptions for a Risk-Informed Approach to Address GSI-191 and Respond to GL-2004-02 (LDCN 19-0014)
Project stage: Supplement
ML21307A3352021-11-0303 November 2021
NRR E-mail Capture - D.C. Cook Nuclear Plant Unit Nos. 1 and 2 - Final RAI - License Amendment Request Regarding Containment Water Level Instrumentation
Project stage: RAI
ML22027A8042022-01-27027 January 2022
Fourth (Post-Audit) Supplement to Request for License Amendment and Regulatory Exemptions for a Risk-Informed Approach to Address GSI-191 and Respond to GL 2004-02 (LDCN 19-0014)
Project stage: Request
ML22027A8052022-01-27027 January 2022
Fourth (Post-Audit) Supplement to Request for License Amendment and Regulatory Exemptions for a Risk-Informed Approach to Address GSI-191 and Respond to GL 2004-02 (LDCN 19-0014)
Project stage: Supplement
ULNRC-06721, Fifth (Post-Audit) Supplement Request for License Amendment and Regulatory Exemptions for a Risk-Informed Approach to Address GSI-191 and Respond to GL 2004-02 (LDCN 19-0014)2022-03-0808 March 2022
Fifth (Post-Audit) Supplement Request for License Amendment and Regulatory Exemptions for a Risk-Informed Approach to Address GSI-191 and Respond to GL 2004-02 (LDCN 19-0014)
Project stage: Supplement
ML22068A0292022-03-0808 March 2022
Response to Audit Question/Item 23 in NRC Letter Dated September 14, 2021
Project stage: Other
ML22068A0272022-03-0808 March 2022
Fifth (Post-Audit) Supplement Request for License Amendment and Regulatory Exemptions for a Risk-Informed Approach to Address GSI-191 and Respond to GL 2004-02 (LDCN 19-0014)
Project stage: Request
ML22087A4022022-03-28028 March 2022
NRR E-mail Capture - Callaway - Draft RAIs - License Amendment and Regulatory Exemptions for a Risk-Informed Approach to Address Generic Safety Issue - 191 and Respond to Generic Letter 2004-02 (EPIDs L-2021-LLA-0059 and L-2021-LLE-0021)
Project stage: Draft RAI
ML22096A0232022-04-0505 April 2022
NRR E-mail Capture - Callaway Plant - Final RAIs - License Amendment and Regulatory Exemptions for a Risk-Informed Approach to Address Generic Safety Issue - 191 and Respond to GL 2004-02 (EPIDs L-2021-LLA-0059 and L-2021-LLE-0021)
Project stage: RAI
ML22146A3392022-05-26026 May 2022
Enclosure 1: Ameren Missouri Response to NRC RAIs
Project stage: Response to RAI
ML22146A3372022-05-26026 May 2022, 27 May 2022
Response to Request for Additional Information Regarding Request for License Amendment and Regulatory Exemptions for Risk-Informed Approach to Address GSI-191 and Respond to Generic Letter 2004-02 (LDCN 19-0014)
Project stage: Request
ULNRC-06735, Response to Request for Additional Information Regarding Request for License Amendment and Regulatory Exemptions for Risk-Informed Approach to Address GSI-191 and Respond to Generic Letter 2004-02 (LDCN 19-0014).2022-05-27027 May 2022
Response to Request for Additional Information Regarding Request for License Amendment and Regulatory Exemptions for Risk-Informed Approach to Address GSI-191 and Respond to Generic Letter 2004-02 (LDCN 19-0014).
Project stage: Response to RAI
ML22182A4012022-08-23023 August 2022
Callaway - Environmental Assessment & Finding of No Significant Impact Requests for Amendment & Regulatory Exemptions for a Risk-Informed Approach to Address GSI-191 and Respond to GL 2004-02 (EPID L-2021-LLA-0059 & L-2021-LLE-0021)
Project stage: Request
ML22182A4112022-08-23023 August 2022
Letter - Environmental Assessment & Finding of No Significant Impact Requests for Amendment & Regulatory Exemptions for a Risk-Informed Approach to Address GSI-191 and Respond to GL 2004-02 (EPID L-2021-LLA-0059 & L-2021-LLE-00021)
Project stage: Other
ML22182A4062022-08-23023 August 2022
FRN - Environmental Assessment & Finding of No Significant Impact Requests for Amendment & Regulatory Exemptions for a Risk-Informed Approach to Address GSI-191 and Respond to GL 2004-02 (EPID L-2021-LLA-0059 & L-2021-LLE-0021)
Project stage: Other
ULNRC-06766, Correction of Text Contained in Enclosures Provided with Supplements to Request for License Amendment and Regulatory Exemptions for a Risk-Informed Approach to Address GSI-191 and Respond to GL 2004-02 (LDCN 19-0014)2022-09-0808 September 2022
Correction of Text Contained in Enclosures Provided with Supplements to Request for License Amendment and Regulatory Exemptions for a Risk-Informed Approach to Address GSI-191 and Respond to GL 2004-02 (LDCN 19-0014)
Project stage: Supplement
ML22220A1322022-10-21021 October 2022
Issuance of Amendment No. 228 Re; Revise Technical Specifications to Address Generic Safety Isusue-191 and Respond to Generic Letter 2004-02 Using Risk-Informed Approach
Project stage: Approval
ML22220A1302022-10-21021 October 2022
Exemptions from the Requirements of 10 CFR 50.46 and 10 CFR Part 50 Appendix a, General Design Criteria 35, 38, and 41 (EPID L-2021-LLE-0021) (Cover Letter)
Project stage: Other
ML22220A1312022-10-21021 October 2022
Exemptions from the Requirements of Title 10 of the Code of Federal Regulations (10 CFR) Section 50.46, 10 CFR 50 Appendix a General Design Criteria 35, 38, and 41 (EPID L-2021-LLE-0021) (Exemptions)
Project stage: Other
ML22220A1292022-10-25025 October 2022
Exemptions from the Requirements of Title 10 of the Code of Federal Regulations (10 CFR) Section 50.46, 10 CFR 50 Appendix a General Design Criteria 35, 38, and 41 (EPID L-2021-LLE-0021) (FRN)
Project stage: Other
2021-07-23
[Table View] |
Text
From:
Chawla, Mahesh Sent:
Tuesday, April 5, 2022 11:38 AM To:
'Elwood, Thomas B' Cc:
Smith, Steve; Russell, Andrea; Klein, Paul; Yoder, Matthew; Tsao, John; Vettori, Robert; Lehman, Bryce; Parks, Benjamin; Ma, John; Hoffman, Robert; Dixon-Herrity, Jennifer
Subject:
Callaway Plant, Unit 1 - Final RAIs - License Amendment and Regulatory Exemptions for a Risk-Informed approach to address Generic Safety Issue -
191 and Respond to Generic Letter 2004-02 ( EPIDs L-2021-LLA-0059 and L-2021-LLE-0021)
Dear Mr. Elwood,
By letter dated March 31, 2021 (Agencywide Documents Access and Management System (ADAMS) Accession No. ML21090A184), as supplemented by letters dated May 27, 2021 (ADAMS Accession No. ML21147A222), July 22, 2021 (ADAMS Accession No. ML21203A192), August 23, 2021 (ADAMS Accession No. ML21237A135), October 7, 2021 (ADAMS Accession No. ML21280A378), January 27, 2022 (ADAMS Accession No. ML22027A804), and March 8, 2022 (ADAMS Accession No. ML22068A027), Union Electric Company, dba Ameren Missouri (the licensee), pursuant to Title 10 of the Code of Federal Regulations (10 CFR) Section 50.90, Application for amendment of license, construction permit, or early site permit, requested an amendment for the licensees final resolution to addressing the concerns of Generic Safety Issue (GSI)-191, Assessment of Debris Accumulation on PWR [Pressurized-Water Reactor] Sump Performance, and for responding to Generic Letter 2004-02, Potential Impact of Debris Blockage on Emergency Recirculation During Design Basis Accidents at Pressurized-Water Reactors. Additionally, in accordance with the provisions of 10 CFR 50.12, Specific exemptions, the licensee requested exemptions from certain requirements of 10 CFR 50.46(a)(1), and Appendix A, General Design Criteria for Nuclear Power Plants, to 10 CFR Part 50, specifically General Design Criterion (GDC) 35, Emergency core cooling, GDC 38, Containment heat removal, and GDC 41, Containment atmosphere cleanup. The U.S. Nuclear Regulatory Commission (NRC) staff is reviewing the application and has determined that the following additional information is required in order to complete review of the subject license amendment and the regulatory exemptions.
REQUEST FOR ADDITIONAL INFORMATION (RAI):
RAI No.: 1
Regulatory Requirement: Section 51.30(a) of Title 10 of the Code of Federal Regulations requires, in part, that an environmental assessment include a brief discussion of the environmental impacts of the proposed action and alternatives, as appropriate.
Background:
In reviewing Ameren Missouris Callaway, Unit 1, Fourth (Post-Audit) Supplement to Request for License Amendment and Regulatory Exemptions for Risk-Informed Approach to Address GSI-191 and Respond to GL 2004-02 dated January 27, 2022 (ADAMS accession no.
ML22027A804), NRC staff has determined that environmental impacts (specifically, additional worker dose and radiologically contaminated waste) could occur in association with the No Action Alternative (i.e., complete compliance with the existing provisions in 10 CFR 50.46(a)(1) and the relevant General Design Criteria), should the subject exemptions and associated license amendment request not be granted. NRC requires this dose and waste information to inform its environmental review.
Request: a) Enclosure 1 of Ameren Missouris Fourth Supplement, i.e., Request for Exemptions for Callaway Risk-Informed Approach to Resolution for Generic Letter 2004-02, states that the minimum dose associated with replacement of insulation in containment is estimated to be greater than 50 person-rem. In order to support the staffs evaluation of potential worker dose impacts, NRC requests that Ameren Missouri provide a more definitive value or upper range for this estimate.
b) Enclosure 1 also states that compliance with 10 CFR 50.46(a)(1) and the relevant General Design Criteria would entail removal and disposal of significant amounts of insulation. In order to support the staffs evaluation of potential waste management impacts, NRC requests that Ameren Missouri provide the estimated volume (cubic feet) of radiologically contaminated waste that would be generated from the replacement of the existing insulation addressed in Enclosure 1.
RAI No: 2 Regulatory Requirement: 10 CFR 40.46 requires that plants maintain the ability to provide long-term core cooling following any initial LOCA response. To ensure that this cooling is available, licensees demonstrate that flashing will not occur at the ECCS strainer so that flow to the ECCS pumps is not interrupted.
Background:
In Enclosure 3 of submittal dated March 31, 2021, the licensee provided the methodology used to demonstrate that flashing would not occur. The NRC discussed this information with the licensee during an audit conducted virtually from August 10 to August 12, 2021 (ADAMS Accession No. ML21238A138) and the licensee submitted additional information regarding the flashing analysis in submittal dated January 27, 2022 (ADAMS Accession No.ML22027A804). In this submittal the licensee stated that approximately 10 percent of the available pressure in containment is required to prevent flashing at the strainer for the large break loss of coolant accident (LBLOCA). The NRC staff agrees that the need to credit only 10 percent of the available pressure, based on a design basis calculation, demonstrates that there is large margin to flashing. However, the long-term cooling period spans a period during which the pool temperature and containment pressure change significantly. The NRC staff could not determine how the 10 percent value was derived.
Request: Clarify whether the 10 percent value is based on the time at which the minimum margin to flashing occurs and that it is based on the pressure predictions for the LBLOCA, not the main steam line break. If it is not based on the time of minimum margin, provide the margin to flashing based on the time at which the margin to flashing is at its minimum.
A clarification call was held between your representatives and the NRC staff today (4/5/2022). During the call you requested 45 days to provide supplemental response on the docket. The NRC staff has agreed to this time period and therefore we will be looking forward to your response on the docket, no later than May 20, 2022. Thanks Sincerely, Mahesh Chawla, Project Manager Plant Licensing Branch IV Division of Operating Reactor Licensing Office of Nuclear Reactor Regulation U.S. Nuclear Regulatory Commission ph: 301-415-8371 Docket No. 50-483 OFFICE DORL/LPL4/PM DORL/LPL4/BC NAME MChawla JDixon-Herrity DATE 03/24/22 03/25/22
Hearing Identifier:
NRR_DRMA Email Number:
1589 Mail Envelope Properties (SA1PR09MB84154096C6C8E7890909E88BF1E49)
Subject:
Callaway Plant, Unit 1 - Final RAIs - License Amendment and Regulatory Exemptions for a Risk-Informed approach to address Generic Safety Issue - 191 and Respond to Generic Letter 2004-02 ( EPIDs L-2021-LLA-0059 and L-2021-LLE-0021)
Sent Date:
4/5/2022 11:38:20 AM Received Date:
4/5/2022 11:38:21 AM From:
Chawla, Mahesh Created By:
Mahesh.Chawla@nrc.gov Recipients:
"Smith, Steve" <Stephen.Smith@nrc.gov>
Tracking Status: None "Russell, Andrea" <Andrea.Russell@nrc.gov>
Tracking Status: None "Klein, Paul" <Paul.Klein@nrc.gov>
Tracking Status: None "Yoder, Matthew" <Matthew.Yoder@nrc.gov>
Tracking Status: None "Tsao, John" <John.Tsao@nrc.gov>
Tracking Status: None "Vettori, Robert" <Robert.Vettori@nrc.gov>
Tracking Status: None "Lehman, Bryce" <Bryce.Lehman@nrc.gov>
Tracking Status: None "Parks, Benjamin" <Benjamin.Parks@nrc.gov>
Tracking Status: None "Ma, John" <John.Ma@nrc.gov>
Tracking Status: None "Hoffman, Robert" <Robert.Hoffman@nrc.gov>
Tracking Status: None "Dixon-Herrity, Jennifer" <Jennifer.Dixon-Herrity@nrc.gov>
Tracking Status: None
"'Elwood, Thomas B'" <TElwood@ameren.com>
Tracking Status: None Post Office:
SA1PR09MB8415.namprd09.prod.outlook.com Files Size Date & Time MESSAGE 6164 4/5/2022 11:38:21 AM Options Priority:
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