ML23110A062

Transmittal of Final Quad Cities Nuclear Power Plant, Unit 1 Accident Sequence Precursor Report (Licensee Event Report 254-2022-001)

ML23110A062
Person / Time
Site:	Quad Cities
Issue date:	04/25/2023
From:	Robert Kuntz Plant Licensing Branch III
To:	Rhoades D Constellation Energy Generation
Kuntz R
References
LER 254-2022-001
Download: ML23110A062 (1)

Text

April 25, 2023 Mr. David P. Rhoades Senior Vice President Constellation Energy Generation, LLC President and Chief Nuclear Officer Constellation Nuclear 4300 Winfield Road Warrenville, IL 60555

SUBJECT:

TRANSMITTAL OF FINAL QUAD CITIES NUCLEAR POWER PLANT, UNIT 1, ACCIDENT SEQUENCE PRECURSOR REPORT (LICENSEE EVENT REPORT 254-2022-001)

Dear Mr. Rhoades:

By letter dated January 26, 2022, Constellation Energy Generation, LLC submitted licensee event report 254-2022-001, High Pressure Coolant Injection System Inoperable Due to Gland Seal System Malfunction, (Agencywide Documents Access and Management System (ADAMS) Accession No. ML22026A288) for Quad Cities Nuclear Power Plant, Unit 1, to the U.S. Nuclear Regulatory Commission (NRC) staff pursuant to Title 10 of the Code of Federal Regulations Section 50.73. As part of the accident sequence precursor (ASP) program, the NRC staff reviewed the event to identify potential precursors and to determine the probability of the event leading to a core damage state. The results of the analysis are provided in the enclosure to this letter.

The increase in core damage probability (CDP) for this event is greater than or equal to 1x10-6. The NRC does not request a formal analysis review, in accordance with Regulatory Issue Summary 2006-24, Revised Review and Transmittal Process for Accident Sequence Precursor Analyses (ML060900007), because the analysis resulted in a CDP of less than 1x10-4.

D. Rhoades If you have any questions, please contact me (301) 415-3733.

Sincerely,

/RA/

Robert F. Kuntz, Senior Project Manager Plant Licensing Branch III Division of Operating Reactor Licensing Office of Nuclear Reactor Regulation Docket No. 50-254

Enclosure:

Final Accident Sequence Precursor Analysis cc: Listserv

ENCLOSURE Final Accident Sequence Precursor Analysis - Quad Cities Nuclear Plant, Unit 1, High Pressure Coolant Injection Inoperable Due to Gland Seal System Malfunction (LER 254-2022-001) -

Precursor Enclosure

Package ML23110A067; Letter ML23110A062; ASP Report ML23087A086 OFFICE NRR/DORL/LPL3/PM NRR/DORL/LPL3/LA NAME RKuntz SRohrer DATE 4/20/23 4/20/20 OFFICE NRR/DORL/LPL3/BC NRR/DORL/LPL3/PM NAME VSreenivas RKuntz DATE 4/24/23 4/25/23