ML20239A726

Supplemental Information Needed for Acceptance of Requested Licensing Action Regarding Request for a License Amendment to Technical Specification 3.7.3, Ultimate Heat Sink

ML20239A726
Person / Time
Site:	LaSalle
Issue date:	08/27/2020
From:	Bhalchandra Vaidya Plant Licensing Branch III
To:	Bryan Hanson Exelon Nuclear
Vaidya B
References
EPID L-2020-LLA-0165
Download: ML20239A726 (4)

Text

August 27, 2020 Mr. Bryan C. Hanson Senior Vice President Exelon Generation Company, LLC President and Chief Nuclear Officer (CNO)

Exelon Nuclear 4300 Winfield Road Warrenville, IL 60555

SUBJECT:

LASALLE COUNTY STATION, UNITS 1 AND 2 - SUPPLEMENTAL INFORMATION NEEDED FOR ACCEPTANCE OF REQUESTED LICENSING ACTION REGARDING REQUEST FOR A LICENSE AMENDMENT TO TECHNICAL SPECIFICATION 3.7.3, "ULTIMATE HEAT SINK" (EPID L-2020-LLA-0165)

Dear Mr. Hanson:

By letter to the U.S. Nuclear Regulatory Commission (NRC) dated July 17, 2020 (Agencywide Documents Access and Management System (ADAMS) Accession No. ML20204A775), Exelon Generation Company, LLC (EGC, the licensee) submitted a request to amend Technical Specification (TS) 3.7.3, "Ultimate Heat Sink [UHS]," for the LaSalle County Station, Units 1 and 2, to expand the TS temperature limit of the cooling water supplied to the plant from the UHS to vary with the diurnal cycle by changing the average sediment level limit in the UHS to 6 inches.

The purpose of this letter is to provide the results of the NRC staffs acceptance review of this amendment request. The acceptance review was performed to determine if there is sufficient technical information in scope and depth to allow the NRC staff to complete its detailed technical review. The acceptance review is also intended to identify whether the application has any readily apparent information insufficiencies in its characterization of the regulatory requirements or the licensing basis of the plant.

Consistent with Section 50.90 of Title 10 of the Code of Federal Regulations (10 CFR),

whenever a holder of a license, including a construction permit and operating license under this part, and an early site permit, combined license, and manufacturing license under 10 CFR Part 52 of this chapter, desires to amend the license or permit, application for an amendment must be filed with the Commission, as specified in Sections 50.4 or 52.3 of this chapter, as applicable, fully describing the changes desired, and following as far as applicable, the form prescribed for original applications. Section 50.34 of 10 CFR addresses the content of technical information required. This section stipulates that the submittal address the design and operating characteristics, unusual or novel design features, and principal safety considerations.

The NRC staff has reviewed your application and concluded that the information delineated in the enclosure to this letter is necessary to enable the staff to make an independent assessment

B. Hanson regarding the acceptability of the proposed amendment/relief request in terms of regulatory requirements and the protection of public health and safety and the environment.

In order to make the application complete, the NRC staff requests that the licensee supplement the application to address the information requested in the enclosure by September 14, 2020.

This will enable the NRC staff to begin its detailed technical review. If the information responsive to the NRC staffs request is not received by the above date, the application will not be accepted for review pursuant to 10 CFR 2.101, and the NRC will cease its review activities associated with the application. If the application is subsequently accepted for review, you will be advised of any further information needed to support the staffs detailed technical review by separate correspondence.

The information requested and associated time frame in this letter were discussed with Mr. Jason Taken of your staff on August 25, 2020.

If you have any questions, please contact me at (301) 415-3308 or at Bhalchandra.Vaidya@nrc.gov .

Sincerely,

/RA/

Bhalchandra K. Vaidya, Project Manager Plant Licensing Branch III Division of Operating Reactor Licensing Office of Nuclear Reactor Regulation Docket Nos. 50-373 and 50-374

Enclosure:

Supplemental Information Needed cc: Listserv

ML20239A726 (*) by email OFFICE NRR/DORL/LPL3/PM(*) NRR/DORL/LPL3/LA(*) NRR/DSS/SCPB/BC(*)

NAME BVaidya SRohrer BWittick DATE 8/26/2020 8/26/2020 8/26/2020 OFFICE NRR/DORL/LPL3/BC(*) NRR/DORL/LPL3/PM(*)

NAME NSalgado BVaidya DATE 8/27/2020 8/27/2020 SUPPLEMENTAL INFORMATION NEEDED FOR ACCEPTANCE OF LICENSE AMENDMENT REQUEST TO RENEWED FACILITY OPERATING LICENSE NOS. NPF-11 AND NPF-18 LICENSE AMENDMENT REQUEST RELATED TO CHANGES IN TECHNICAL SPECIFICATION 3.7.3, ULTIMATE HEAT SINK EXELON GENERATION COMPANY, LLC LASALLE COUNTY STATION, UNITS 1 AND 2 DOCKET NOS. 50-373 AND 50-374 The licensee application dated July 17, 2020 (Agencywide Documents Access and Management System (ADAMS) Accession No. ML20204A775), does not provide sufficient information with respect to any reference, calculation or basis, for how the reduction of sedimentation and increase in UHS volume corresponds to the resulting development of temperatures in the proposed curve shown in Figure 3.7.3-1 and Figure 1 of application.

Please provide all necessary references, calculations, or bases, to support staff technical review of the revision to the proposed figure.

Enclosure