ML18192C171

NRR E-mail Capture - Preliminary Request for Additional Information Regarding Braidwood Station, Units 1 and 2, Relief Request IR4-03

ML18192C171
Person / Time
Site:	Braidwood
Issue date:	07/11/2018
From:	Joel Wiebe Plant Licensing Branch III
To:	Simpson L Exelon Corp
References
L-2018-LLR-0033
Download: ML18192C171 (3)

Text

NRR-DMPSPEm Resource From: Wiebe, Joel Sent: Wednesday, July 11, 2018 2:16 PM To: Lisa Simpson (Lisa.Simpson@exeloncorp.com)

Cc: Vaidya, Bhalchandra

Subject:

Preliminary Request for Additional Information Regarding Braidwood Station, Units 1 and 2, Relief Request IR4-03

Lisa, The purpose of providing a preliminary request for additional information is to ensure the request is clear and understandable. If a clarification call is needed, let Bhalchandra Vaidya (301-415-3308) know within one week of the date of this e-mail. I will be out of the office 7/16 through 7/30, returning on 7/31. A response is requested within 30 days.

Joel REQUEST FOR ADDITIONAL INFORMATION PROPOSED ALTERNATIVE REQUEST NUMBER I4R-03 REVISION 1 CONTROL ROD DRIVE MECHANISM CANOPY SEAL WELD REPAIR BRAIDWOOD STATION UNITS 1 AND 2 EXELON GENERATION COMPANY, LLC DOCKET NOS. 50-456 AND 50-457 EPID: L-2018-LLR-0033 By letter dated March 19, 2018 (Agencywide Documents Access and Management System (ADAMS)

Accession No. ML18078A185), as supplemented by letter dated May 3, 2018 (ADAMS Accession No. ML18124A154), Exelon Generation Company, LLC (the licensee), submitted a request in accordance with Paragraph 50.55a(z)(2) of Title 10 of the Code of Federal Regulations (10 CFR) for a proposed alternative to the requirements of Section XI, "Rules for lnservice Inspection of Nuclear Power Plant Components," of the American Society of Mechanical Engineers Boiler and Pressure Vessel Code (ASME Code) at Braidwood Station, Units 1 and 2. The proposed alternative would permit the licensee to perform an alternative repair of leaking control rod drive mechanism canopy seal welds in lieu of specified ASME Code requirements.

To complete its review, the NRC staff requests the following additional information.

Section 5 Proposed Alternative and Basis for Use of the licensees proposed alternative states The CRDM canopy seal weld flaws will not be removed, but an analysis of the repaired weldment will be performed, prior to entering Mode 4, to assure that the remaining flaw will not propagate unacceptably. In a previous relief request dated September 19, 2013 (ADAMS Accession No. ML13263A372), with a supplement dated January 24, 2014 (ADAMS Accession No. ML14024A588), the licensee stated that it will use applicable portions of ASME Code Case N-504-4, "Alternative Rules for Repair of Class 1, 2, and 3, Austenitic Stainless Steel Piping,Section XI, Division 1," for repair by weld overlay to provide a new leakage barrier and that the remaining flaw analysis would be using Paragraph (g) of ASME Code Case N-504-4. Provide a description of 1

methods to be used for the current design of the weld overlay and perform the flaw growth analysis and a basis for why the chosen methods are acceptable.

2

Hearing Identifier: NRR_DMPS Email Number: 464 Mail Envelope Properties (Joel.Wiebe@nrc.gov20180711141600)

Subject:

Preliminary Request for Additional Information Regarding Braidwood Station, Units 1 and 2, Relief Request IR4-03 Sent Date: 7/11/2018 2:16:20 PM Received Date: 7/11/2018 2:16:00 PM From: Wiebe, Joel Created By: Joel.Wiebe@nrc.gov Recipients:

"Vaidya, Bhalchandra" <Bhalchandra.Vaidya@nrc.gov>

Tracking Status: None "Lisa Simpson (Lisa.Simpson@exeloncorp.com)" <Lisa.Simpson@exeloncorp.com>

Tracking Status: None Post Office:

Files Size Date & Time MESSAGE 2551 7/11/2018 2:16:00 PM Options Priority: Standard Return Notification: No Reply Requested: No Sensitivity: Normal Expiration Date:

Recipients Received: