ML14120A003

Draft RAI for McGuire 1 Steam Generator Report

ML14120A003
Person / Time
Site:	Mcguire, McGuire
Issue date:	04/28/2014
From:	Ed Miller Division of Operating Reactor Licensing
To:	Crane K Duke Energy Corp
References
Download: ML14120A003 (3)

Text

1 NRR-PMDAPEm Resource From: Miller, Ed Sent: Monday, April 28, 2014 3:17 PM To: 'kay.crane@duke-energy.com'

Subject:

Draft RAI for McGuire 1 Steam Generator Report Attachments:Draft RAI.docxKay, The NRC staff's draft RAI for the subject report is attached to this e-mail. The draft RAI is not an official NRC staff request and is being provided to you to facilitate a subsequent conference call to determine: 1) If the questions clearly convey the NRC staff information needs; 2) Whether the regulatory basis for the questions is understood; and 3) Whether the information is already available in existing, docketed, correspondence. After you've had a chance to review the draft information request, please contact me to schedule the conference call. Thanks.

Ed Miller

(301) 415-2481

Hearing Identifier: NRR_PMDA Email Number: 1258 Mail Envelope Properties (9C2386A0C0BC584684916F7A0482B6CAF9BC2D492B)

Subject:

Draft RAI for McGuire 1 Steam Generator Report Sent Date: 4/28/2014 3:17:03 PM Received Date: 4/28/2014 3:17:00 PM From: Miller, Ed Created By: Ed.Miller@nrc.gov Recipients: "'kay.crane@duke-energy.com'" <kay.crane@duke-energy.com> Tracking Status: None

Post Office: HQCLSTR02.nrc.gov Files Size Date & Time MESSAGE 624 4/28/2014 3:17:00 PM Draft RAI.docx 27717 Options Priority: Standard Return Notification: No Reply Requested: No Sensitivity: Normal Expiration Date: Recipients Received:

DRAFT REQUEST FOR ADDITIONAL INFORMATION MCGUIRE NUCLEAR STATION, UNIT 1 STEAM GENERATOR INSPECTION REPORT EOC 22 DOCKET NO. 50-369

By letter dated July 11, 2013, (Agenc ywide Documents Access and Management System (ADAMS) Accession No. ML13205A469), Duke Energy Carolinas (Duke) submitted an in-service inspection report for the McGuire Unit 1 end of cycle 22 steam generator inspection. In order for the NRC staff to complete its review of the report, the following additional information is requested.

1. Please discuss the scope and results of any inspections (other than the steam generator tube plug inspections) performed in the SG primary channel heads. 2. In section "a" of the report, the acronym TWD is used; please define and clarify if this is referring to new wear indications. 3. In section "g" of the report, seven indications of wear due to foreign objects were noted, four with no evidence of a foreign object remaining and three with evidence of a foreign object remaining. Please reconcile these numbers against what was provided in the Attachment 1 tables of the report, which seem to indicate that there are four indications of wear with possible loose parts present (LPIs). 4. Please clarify the statement in section "e" of your report. Did all the tubes that were plugged have wear attributed to a loose part that could not be removed?

Please clarify which tubes were plugged. Also, please discuss whether a visual inspection was performed at the location of the LPIs in SG D (since all four indications appear to be in the same general vicinity). 5. Please provide the effective full power years of operation for each refueling outage since 2008.