ML15229B008

NRR E-mail Capture - Final RAIs- Watts Bar 2 Relief Request SG Welds

ML15229B008
Person / Time
Site:	Watts Bar
Issue date:	08/17/2015
From:	Dion J Watts Bar Special Projects Branch
To:	Arent G Tennessee Valley Authority
References
TAC MF6474
Download: ML15229B008 (3)

Text

NRR-PMDAPEm Resource From: Dion, Jeanne Sent: Monday, August 17, 2015 2:02 PM To: Arent, Gordon <garent@tva.gov> (garent@tva.gov); rhbryan@tva.gov Cc: Poole, Justin; Sheng, Simon

Subject:

FINAL RAIs- Watts Bar 2 Relief Request SG Welds (TAC No. MF6474)

Attachments: FINAL RR WBN-2 PSI-3 RAI (MF6474).docx Bob and Gordon, On July 10, 2014 TVA submitted a request for relief for Watts Bar 2 Preservice Inspections pertaining to inaccessible steam generator welds. On Friday, August 14 a clarification call was held with your staff regarding requests for additional information (RAI) that is needed to complete the safety review. During this call you indicated that TVA would respond to the RAIs no later than August 28, 2015. Please let me know if you expect any delays in responding to these RAIs.

Thanks, Jeanne Dion Project Manager Watts Bar Special Projects Branch Division of Operating Reactor Licensing Office of Nuclear Reactor Regulation 301-415-1349 On Friday August 14, 1

Hearing Identifier: NRR_PMDA Email Number: 2301 Mail Envelope Properties (8c675b3a53f7422da3de029f22370208)

Subject:

FINAL RAIs- Watts Bar 2 Relief Request SG Welds (TAC No. MF6474)

Sent Date: 8/17/2015 2:01:39 PM Received Date: 8/17/2015 2:01:00 PM From: Dion, Jeanne Created By: Jeanne.Dion@nrc.gov Recipients:

"Poole, Justin" <Justin.Poole@nrc.gov>

Tracking Status: None "Sheng, Simon" <Simon.Sheng@nrc.gov>

Tracking Status: None "Arent, Gordon <garent@tva.gov> (garent@tva.gov)" <garent@tva.gov>

Tracking Status: None "rhbryan@tva.gov" <rhbryan@tva.gov>

Tracking Status: None Post Office: HQPWMSMRS08.nrc.gov Files Size Date & Time MESSAGE 697 8/17/2015 2:01:00 PM FINAL RR WBN-2 PSI-3 RAI (MF6474).docx 31884 Options Priority: Standard Return Notification: No Reply Requested: No Sensitivity: Normal Expiration Date:

Recipients Received:

REQUEST FOR ADDITIONAL INFORMATION BY THE OFFICE OF NUCLEAR REACTOR REGULATION REQUESTS FOR RELIEF WBN-2/PSI-3REGARDING INSPECTION OF CIRCUMFERENTIAL WELD SG-4B-5-2 TENNESSEE VALLEY AUTHORITY WATTS BAR NUCLEAR PLANT, UNIT 2 DOCKET NUMBER 50-391

RAI-1

Relief Request WBN-2/PSI-3 states that, Circumferential shell weld on steam generator number 2 (Weld SG-4B-5 lower shell-to-cone weld) is partially inaccessible for examination because of the upper steam generator support bracket. Describe what it takes to increase the volumetric examination coverage beyond 24 percent reported in the relief request. Also, without explanation,it is hard to confirm from Drawing ISI-2001-E-03 that your best effort will result in a coverage of only 24 percent. Please provide this explanation.

RAI-2

Provide the preservice inspection results and disposition of indications forWeld SG-4B-5-2 for Unit 2. If the steam generator of Unit 1 was fabricated by the same manufacturer around the similar time as Unit 2, provide corresoponding information of Unit 1 to supplement the limited inspection information for Unit 2.

RAI-3

Provide one or two more industry precedents regarding inspection of IWC-2500-1 Category C-A or C-B items for multiple vessels in a unit, with examination coverage less than 50 %.