ML121180159

Email, Request for Additional Information Regarding the 2011 Steam Generator Tube Inspections

ML121180159
Person / Time
Site:	Waterford
Issue date:	04/27/2012
From:	Kalyanam N Plant Licensing Branch IV
To:	Steelman W Entergy Operations
Kalyanam N, NRR/DORL/LPL4, 415-1480
References
TAC ME7601
Download: ML121180159 (2)

Text

From: Kalyanam, Kaly Sent: Friday, April 27, 2012 10:29 AM To: STEELMAN, WILLIAM J Cc: Lent, Susan; Burkhardt, Janet

Subject:

Request for Additional Information Regarding the 2011 Steam Generators Tube Inspections (TAC No. ME7601)

Plant: Waterford Steam Electric Station Unit 3 Docket No.: 50-382

Subject:

Request for Additional Information Regarding the 2011 Steam Generators Tube Inspections (TAC No. ME7601)

TAC Nos.: ME7601 SUNSI Review Done: Yes. Publicly Available, Normal Release, Non-sensitive, From: N. Kalyanam To: W. Steelman

Billy, By letter dated November 3, 2011 (Agencywide Documents Access and Management System (ADAMS) Accession Number ML113080090), Entergy Operations, Inc. (the licensee) submitted information pertaining to the steam generator (SG) tube inspections performed during refueling outage 17 (spring 2011) at the Waterford Steam Electric Station Unit 3. In addition to this report, the U.S. Nuclear Regulatory Commission staff summarized two conference calls held with the licensee, concerning the 2011 SG tube inspections, in a letter dated May 23, 2011 (ADAMS Accession Number ML111380641). Information the licensee provided in support of these calls is located in ADAMS under Accession Number ML11137A201. In order to complete its review, the staffs need the following additional information:

Thanks Kaly REQUEST FOR ADDITIONAL INFORMATION REGARDING STEAM GENERATOR TUBE INSPECTION REPORT FOR THE 2011 REFUELING OUTAGE WATERFORD STEAM ELECTRIC STATION UNIT 3 DOCKET NUMBER 50-382

1. Please clarify the following, since the staff is unable to reconcile information in Section B and Table E-1 (Attachment 1), and Tables E-2 and E-3 (Attachment 2) of your November 3, 2011, letter.

a) Please identify the tubes with axially oriented outside diameter stress corrosion cracks in the freespan region in SG 31 not associated with dings (refer to Section B).

b) Please identify the tubes with axially oriented outside diameter stress corrosion cracks in the freespan region in SGs 31 and 32 associated with dings (refer to Section B).

c) Please identify the three tubes with U-bend indications (refer to Table E-1).

d) Please clarify the number of tubes with axial indications in the freespan region of the hot leg since three tubes are reported in Table E-1, but there are five listed in Tables E-2 and E-3.

e) In light of the above, please fully reconcile Section B and Tables E-1, E-2, and E-3.

2. For the indications associated with dings, please provide the magnitude of the ding and discuss whether the indications were initially reported with the bobbin coil probe. If not initially identified with the bobbin probe, please discuss the basis for not expanding your inspections of dings greater than 5 volts (and/or expanding to dings less than 5 volts).

3. For the indications in the U-bend, please discuss the nature of the indications. If the indications are crack-like, please discuss how they were detected (e.g.,

bobbin probe). If initially detected with the rotating probe, discuss the basis for not expanding the scope of rotating probe inspections in the U-bend region.