ML23347A049

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Technical Specification Bases Changes Updated Through November 2023
ML23347A049
Person / Time
Site: Summer South Carolina Electric & Gas Company icon.png
Issue date: 12/12/2023
From: Haselden R
Dominion Energy South Carolina
To:
Office of Nuclear Reactor Regulation, Document Control Desk
References
23-340
Download: ML23347A049 (1)


Text

V.C. Summer Nuclear Station ed Dominion Bradham Blvd & Hwy 215. Jenkinsville, SC 29065 Mailing Address:

P.O. Box 88, Jenkinsville. SC 29065 Energy DominionEnergy.com December 12, 2023 Attn: DocumentControlDesk Serial No.23-340 U. S. Nuclear Regulatory Commission VCS LIC/HK/Rev0 Washington, DC 20555-0001 DocketNo. 50-395 LicenseNo. NPF-12 DOMINIONENERGY SOUTH CAROLINA (DESC)

VIRGIL C. SUMMER NUCLEAR STATION (VCSNS) UNIT 1 TECHNICAL SPECIFICATION BASES CHANGES UPDATED THROUGH NOVEMBER 2023 In accordancewith Virgil C. Summer Nuclear Station (VCSNS) Unit 1 Technical Specifications (TS) 6.8.4.i.4, Dominion Energy South Carolina (DESC), acting for itself and as agent for South Carolina Public Service Authority, submits annual changes to the TS Bases.

This update includes changes to the TS Bases since the previous submittal in November 2022.

The enclosed changes were incorporated with License Amendment 224. Changes are annotated by vertical revision bars and the amendment number at the bottom of the affected TS Basespages.

Should you have any questions, please call Michael S. Moore at (803) 345-4752.

RobinR. Haselden Director, Nuclear Station Safety and Licensing V.C. SummerNuclearStation Commitmentscontained in this letter: None : Summary of TS Bases Changes Through November2023 : Technical Specification Bases Changes Updated Through November 2023 CC G. J. Lindamood - Santee Cooper L. Dudes- NRCRegionII G.E. Miller - NRC Project Manager NRC Resident Inspector

Serial No.23-340 Enclosure 1: Page 1 of 1 Enclosure 1 Summary of TS Bases Changes Through November 2023 License Amendment No. 224 Descriptionof Change:

Amendment 224 (ML23012A015) revised TS 4.6.2.1 .d to change the frequency at which each reactor building spray nozzle must be verified to be unobstructed. TS Bases for SR 4.6.2.1 were revised to add applicable spray nozzle testing information and information that prompts performanceof an evaluationto determine the appropriate test method if it is determined that performance of the surveillance is required. Examples of possible test methods were also includedin the TS Bases, and include, but not limited to, visual inspection, air or smoke or equivalentflow test, and draining and flushing the filled portions of the system inside containment. Specifically, the following insertion was implemented as indicated in VCSNSs applicationdated April 22, 2022 (ML22115A104),as supplemented by letter dated June 27, 2022 (ML22179A368):

SurveillanceRequirement4.6.2.1.d requires verification that each spray nozzle is unobstructedfollowing activitiesthat could cause nozzle blockage. Due to the passive design of the nozzle, confirmation of operability following activities that could result in nozzle blockage is consideredadequate to detect obstruction of the nozzles. Normal plant operation and maintenanceactivities are not expected to trigger performanceof this surveillance requirement. However, activities, such as an inadvertent spray actuation that causes fluid flow through the nozzles, a major configuration change, or a loss of foreign material control when working within the respective system boundary may require surveillance performance. An evaluation, based on the specific situation, will determinethe appropriate methodfor performing the surveillance. Examples of possible test methods include, but are not limited to, visual inspection, air or smoke or equivalent flow test, and draining and flushing the filled portion of the system inside containment.

Reasonand Basis for Change:

The reason for the change was to eliminate unnecessary testing of the spray nozzles by only requiringverification that each nozzle is unobstructed following activities or conditions that could potentiallycause nozzle blockage. Prior to this change the surveillance required workers to verify air flow at each nozzle. The nozzles are located at high elevations insidethe Reactor Building and in a potentially elevated temperature environment. Limiting the exposure to such conditions will reduce the risk to personnel safety. VCSNS has determined that this change more accurately reflects situations where spray nozzle testing should be performedto verify system operability.

Serial No.23-340 Enclosure 2: Page 1 of 1 Enclosure 2 Technical Specification Bases Changes Updated Through November 2023 Pages Affected

[Mmi

CONTAINMENTSYSTEMS BASES REACTORBUILDINGSPRAYSYSTEM (Continued)

Surveillance Requirement 4.6.2.1.d requires verification that each spray nozzle is unobstructed following activities that could cause nozzle blockage. Due to the passive design of the nozzle, confirmation of operability following activities that could result in nozzle blockage is considered adequate to detect obstruction of the nozzles. Normal plant operation and maintenance activities are not expected to trigger performance of this surveillance requirement. However, activities, such as an inadvertent spray actuation that causes fluid flow through the nozzles, a major configuration change, or a loss of foreign material control when working within the respective system boundary may require surveillance performance. An evaluation, based on the specific situation,will determine the appropriate method for performing the surveillance. Examples of possible test methods include, but are not limited to, visual inspection, air or smoke or equivalentflow test, and draining and flushing the filled portion of the system inside containment.

SUMMER- UNIT1 B 3/4 6-3b Amendment No.224