ML22168A164

Summary of June 9, 2022, Meeting with TVA Regarding a Proposed License Amendment Request Related to Low Temperature Overpressure System and Cold Overpressure Mitigation System for Sequoyah and Watts Bar Nuclear Plants

ML22168A164
Person / Time
Site:	Watts Bar, Sequoyah
Issue date:	06/27/2022
From:	Kimberly Green NRC/NRR/DORL/LPL2-2
To:	Tennessee Valley Authority
Green K, NRR/DORL/LPL2-2
References
EPID L-2022-LRM-0040
Download: ML22168A164 (4)

Text

June 27, 2022

LICENSEE: Tennessee Valley Authority

FACILITY: Sequoyah Nuclear Plant, Units 1 and 2 Watts Bar Nuclear Plant, Units 1 and 2

SUMMARY

OF JUNE 9, 2022, MEETING WITH TENNESSEE VALLEY AUTHORITY REGARDING A PROPOSED LICENSE AMENDMENT REQUEST RELATED TO LOW TEMPERATURE OVERPRESSURE SYSTEM AND COLD OVERPRESSURE MITIGATION SYSTEM FOR SEQUOYAH AND WATTS BAR NUCLEAR PLANTS (EPID L-2022-LRM-0040)

On June 9, 2022, the U.S. Nuclear Regulatory Commission (NRC) staff conducted an observation meeting with representatives of the Tennessee Valley Authority (TVA). The purpose of the meeting was to discuss TVAs proposed license amendment request related to the low temperature overpressure system at Sequoyah Nuclear Plant (Sequoyah), Units 1 and 2, and the cold overpressure mitigation system at Watts Bar Nuclear Plant (Watts Bar), Units 1 and 2.

The meeting notice and agenda, dated May 19, 2022, are available at Agencywide Documents Access and Management System (ADAMS) Acce ssion No. ML22139A021. TVAs presentation slides for the meeting are available in ADAMS (ML22157A413). A list of participants is enclosed.

TVA stated that it plans to request an amendment to the operating licenses for Sequoyah, Units 1 and 2, and Watts Bar, Units 1 and 2, to revise Technical Specification 3.4.12, Low Temperature Overpressure Protection (LTOP) System, and Technical Specification 3.4.12, Cold Overpressure Mitigation System (COMS), respectively. The proposed amendments will add a note to the respective technical specifications to allow the operation of one safety injection pump (SIP) capable of injecting into the reactor coolant system (RCS) during Modes 5 or 6 with the pressurizer manway cover removed. The reasons for the request are to provide flexibility in critical path scheduling during outages and to enable specialized outage resources to be released from the outage project more rapidly since outage resources are often shared between the two plants.

TVA explained that to preclude the need for a redesign of the LTOP/COMS, which would require reanalysis and possibly a change in setpoints for the power-operated relief valves (PORVs), the RCS can be vented to the containment atmosphere via the pressurizer manway for the duration that the SIP will be capable of injecting into the RCS. TVA performed an analysis to demonstrate that the pressurizer manway opening is capable of relieving the mass input transient of the charging pump and SIP. TVA concluded that the proposal to operate the safety injection pump during the applicable modes for LTOP/COMS will not require a redesign of the systems nor the PORV setpoints.

TVA plans to submit the license amendment request by July 21, 2022, and will request approval by July 2023.

No regulatory decisions were made at this meeting.

Please direct any inquiries to me at 301-415-1627 or by e-mail to Kimberly.Green@nrc.gov.

/RA/

Kimberly J. Green, Senior Project Manager Plant Licensing Branch II-2 Division of Operating Reactor Licensing Office of Nuclear Reactor Regulation

Docket Nos. 50-327 and 50-328 50-390 and 50-391

Enclosure:

List of Participants

cc: Listserv LIST OF PARTICIPANTS

JUNE 9, 2022, PUBLIC MEETING WITH TENNESSEE VALLEY AUTHORITY

REGARDING SEQUOYAH NUCLEAR PLANT AND WATTS BAR NUCLEAR PLANT

PROPOSED LICENSE AMENDMENT REQUEST FOR LOW TEMPERATURE

OVERPRESSURE SYSTEM AND COLD OVERPRESSURE MITIGATION SYSTEM

Name Affiliation

Kim Green U.S. Nuclear Regulatory Commission (NRC)

Perry Buckberg NRC Santosh Bhatt NRC Steve Smith NRC

Andy Taylor Tennessee Valley Authority (TVA)

Dean Baker TVA Mike Bruchey TVA Chris Carey TVA Duke Dang TVA Kasey Decker TVA Shawna Hughes TVA Dave Porter TVA Earl Ridgell TVA Russ Wells TVA Gordon Williams TVA

Enclosure

ML22168A164 *by email OFFICE DORL/LPL2-2/PM DORL/LPL2-2/LA* DORL/LPL2-2/BC* DORL/LPL2-2/PM NAME KGreen RButler DWrona KGreen DATE 06/16/2022 06/27/2022 06/27/2022 06/27/2022