RA-21-0028, Submittal of Information Related to Pressurizer Surge and Spray Nozzle Thermal Sleeves Attachment Welds for License Renewal

Submittal of Information Related to Pressurizer Surge and Spray Nozzle Thermal Sleeves Attachment Welds for License Renewal

ML21074A266
Person / Time
Site:	Catawba
Issue date:	03/15/2021
From:	Simril T Duke Energy Corp
To:	Document Control Desk, Office of Nuclear Reactor Regulation
References
RA-21-0028
Download: ML21074A266 (2)

Text

( ~ DUKE Tom Simril ENERGY Vice President Catawba Nuclear Station Duke Energy CN01VP / 4800 Concord Road York, SC 29745 803-701-3340 Tom.Simril@duke-energy.com Serial: RA-21-0028 March 15, 2021 U.S. Nuclear Regulatory Commission ATTN: Document Control Desk Washington, DC 20555-0001 CATAWBA NUCLEAR STATION, UNIT NOS. 1 AND 2 DOCKET NOS. 50-413 AND 50-414 RENEWED LICENSE NOS. NPF-35 AND NPF-52

SUBJECT:

SUBMITTAL OF INFORMATION RELATED TO PRESSURIZER SURGE AND SPRAY NOZZLE THERMAL SLEEVES ATTACHMENT WELDS FOR LICENSE RENEWAL The Catawba Nuclear Station, Units 1 and 2 (CNS) Updated Final Safety Analysis Report (UFSAR) Section 18.2.1.1 contains the original commitment to submit to the Nuclear Regulatory Commission (NRC) the results of the susceptibility ranking for the pressurizer surge and spray nozzle thermal sleeves attachment welds following issuance of renewed operating licenses for CNS and prior to December 6, 2024 (the end of the initial license of CNS Unit 1).

As currently described in the UFSAR, the original Alloy 600 Aging Management Review (AMR) was completed with the issuance of the renewed operating licenses. The purpose of the Alloy 600 AMR was to ensure that nickel-based alloy locations would be adequately inspected. Since that time, the program description has been revised to reflect the requirements imposed and commitments made subsequent to the issuance of the renewed operating licenses. The intent of the original Alloy 600 AMR is now met by the more comprehensive Alloy 600 Aging Management Program (AMP). The following are the results of the susceptibility ranking for the pressurizer surge and spray nozzle thermal sleeves attachment welds:

The pressurizer surge nozzle thermal sleeves attachment welds were ranked the same as the pressurizer surge nozzle to safe end welds.

The pressurizer spray nozzle thermal sleeves attachment welds were not fabricated from Alloy 82/182 material and were thus removed from the susceptibility ranking.

U.S. Nuclear Regulatory Commission RA-21-0028 Page2 There are no new regulatory commitments contained in this letter. Should you have any questions conceming this letter, or require additional information, please contact Art Zaremba, Director - Nuclear Fleet licensing, at 980-373-2062.

Sincerely, Tom Simril Site Vice President Catawba Nuclear Station NOE cc:

L. Dudes, Regional Administrator USNRC Region II J.D. Austin, USNRC Senior Resident Inspector K. Cotton, NRR Project Manager L. Gamer, Manager, SCDHEC