ML16265A023

Request for Additional Information, North Anna Power Station, Unit 2, Spring 2016 Steam Generator Tube Inspections

ML16265A023
Person / Time
Site:	North Anna
Issue date:	09/20/2016
From:	V Sreenivas Plant Licensing Branch II
To:	Heacock D Dominion Generation
References
Download: ML16265A023 (2)

Text

NRR-PMDAPEm Resource From: Sreenivas, V Sent: Tuesday, September 20, 2016 6:47 PM To: david.heacock@dom.com Cc: Diane Aitken (Generation - 6); Craig D Sly (Generation - 6); Jay Leberstien; Johnson, Andrew

Subject:

Request for additional information, North Anna Power Station, Unit 2, Spring 2016 steam generator tube inspections By letter dated July 12, 2016 (Agencywide Documents Access and Management System (ADAMS) Accession No. ML16202A066), Virginia Electric & Power Co. (the licensee) submitted information summarizing the results of the spring 2016 steam generator tube inspections at North Anna Power Station, Unit 2, which were performed during refueling outage 24. The U.S. Nuclear Regulatory Commission (NRC) staff has reviewed the licensee provided information and determined that additional information is needed. In order to complete its review, the NRC staff requests the following additional information:

1. Please discuss the scope and results of the channel head video examinations.

2. Please discuss the results of the secondary side inspections.

3. Please provide the location and sizes of the eight new dents reported in steam generator (SG) A. Also, please provide any insight you have into the cause of these new service induced indications.

4. The circumferential extent (i.e., arc length) of the two wear indications in SG C, created by contact with tube support plates (TSP), were listed as 49 degrees and 42 degrees. Please provide the arc lengths of the TSP lands. If the tube wear indications have arc lengths larger than the TSP lands, please discuss any insights.

5. The arc length of the foreign object wear indication in SG C was listed as 56 degrees. Please provide the arc length of the broached opening in this TSP and discuss how the arc length of the TSP broached opening compares to the size of the foreign object wear indication.

Please submit the response by October 20, 2016. If you have any questions please contact me at 301-415-2597.

___________________________

V. Sreenivas, PM for North Anna NRR/DORL/LPL2-1 1

Hearing Identifier: NRR_PMDA Email Number: 3075 Mail Envelope Properties (V.Sreenivas@nrc.gov20160920184700)

Subject:

Request for additional information, North Anna Power Station, Unit 2, Spring 2016 steam generator tube inspections Sent Date: 9/20/2016 6:47:10 PM Received Date: 9/20/2016 6:47:00 PM From: Sreenivas, V Created By: V.Sreenivas@nrc.gov Recipients:

"Diane Aitken (Generation - 6)" <diane.aitken@dom.com>

Tracking Status: None "Craig D Sly (Generation - 6)" <craig.d.sly@dom.com>

Tracking Status: None "Jay Leberstien" <jay.leberstien@dom.com>

Tracking Status: None "Johnson, Andrew" <Andrew.Johnson@nrc.gov>

Tracking Status: None "david.heacock@dom.com" <david.heacock@dom.com>

Tracking Status: None Post Office:

Files Size Date & Time MESSAGE 1756 9/20/2016 6:47:00 PM Options Priority: Standard Return Notification: No Reply Requested: No Sensitivity: Normal Expiration Date:

Recipients Received: