ML120760034

Request for Additional Information Regarding Steam Generator Tube Inservice Inspection Report for End of Cycle 20

ML120760034
Person / Time
Site:	Millstone
Issue date:	03/29/2012
From:	Sanders C Plant Licensing Branch 1
To:	Heacock D Dominion Nuclear Connecticut
Sandeers, Carleen, NRR/DORL, 415-1603
References
TAC ME7352
Download: ML120760034 (3)

Text

UNITED STATES NUCLEAR REGULATORY COMMISSION WASHINGTON, D.C. 20555-0001 March 29, 2012 Mr. David A. Heacock President and Chief Nuclear Officer Dominion Nuclear Connecticut, Inc.

Innsbrook Technical Center 5000 Dominion Boulevard Glen Allen, VA 23060-6711 SUB..IECT: MILLSTONE POWER STATION, UNIT NO.2 - REQUEST FOR ADDITIONAL INFORMATION REGARDING STEAM GENERATOR TUBE INSERVICE INSPECTION REPORT FOR END OF CYCLE 20 (TAC NO. ME7352)

Dear Mr. Heacock:

By letter dated October 7,2011 (Agencywide Documents Access and Management System Accession No. ML11291A059), Dominion Nuclear Connecticut, Inc. (the licensee), submitted information summarizing the results of the end of cycle 20 steam generator tube inspections at Millstone Power Station, Unit No.2. The U.S. Nuclear Regulatory Commission staff has reviewed the information provided by the licensee and has determined that the enclosed additional information is needed in order to complete the review.

The draft questions were sent to Ms. Wanda Craft, of your staff, to ensure that the questions were understandable, the regulatory basis for the questions was clear, and to determine if the information was previously docketed. On March 15, 2012, Ms. Craft agreed that you would provide a response by May 17, 2012.

If you have any questions regarding this matter, please contact me at 301-415-1603.

Sit;, ~ ___

Carleen J. ders, Project Manager Plant Licensing Branch 1-2 Division of Operating Reactor Licensing Office of Nuclear Reactor Regulation Docket No. 50-336

Enclosure:

As stated cc w/encl: Distribution via Ustserv

OFFICE OF NUCLEAR REACTOR REGULATION REQUEST FOR ADDITIONAL INFORMATION STEAM GENERATOR TUBE INSERVICE INSPECTION REPORT FOR END OF CYCLE 20 MILLSTONE POWER STATION, UNIT NO.2 DOCKET NUMBER 50-336 By letter dated October 7,2011 (Agencywide Documents Access and Management System Accession No. ML11291A059), Dominion Nuclear Connecticut, Inc. (the licensee), submitted information summarizing the results of the end of cycle 20 steam generator (SG) tube inspections at Millstone Power Station, Unit No.2. The U.S. Nuclear Regulatory Commission staff has reviewed the information provided by the licensee and has determined that the following additional information is needed in order to complete the review:

1. There were a number of indications reported in Table 3 of the October 7,2011, submittal that appear to be in the free span region and are classified as foreign object wear.

Please discuss the basis for concluding that the indications were the result of foreign object wear (e.g., visual inspection confirming a wear scar).

2. Please discuss the results of the secondary side inspections and channel head inspections.

3. There were a number of newly reported dents and dings on both the hot-leg and cold-leg of both SGs. Please discuss the nature of these new dents and dings and what may have caused them.

Enclosure

March 29, 2012 Mr. David A. Heacock President and Chief Nuclear Officer Dominion Nuclear Connecticut, Inc.

Innsbrook Technical Center 5000 Dominion Boulevard Glen Allen, VA 23060-6711

SUBJECT:

MILLSTONE POWER STATION, UNIT NO.2 - REQUEST FOR ADDITIONAL INFORMATION REGARDING STEAM GENERATOR TUBE INSERVICE INSPECTION REPORT FOR END OF CYCLE 20 (TAC No. ME7352)

Dear Mr. Heacock:

By letter dated October 7,2011 (Agencywide Documents Access and Management System Accession No. ML11291A059), Dominion Nuclear Connecticut, Inc. (the licensee), submitted information summarizing the results of the end of cycle 20 steam generator tube inspections at Millstone Power Station, Unit No.2. The U.S. Nuclear Regulatory Commission staff has reviewed the information provided by the licensee and has determined that the enclosed additional information is needed in order to complete the review.

The draft questions were sent to Ms. Wanda Craft, of your staff, to ensure that the questions were understandable, the regulatory basis for the questions was clear, and to determine if the information was previously docketed. On March 15, 2012, Ms. Craft agreed that you would provide a response by May 17,2012.

If you have any questions regarding this matter, please contact me at 301-415-1603.

Sincerely,

/raj Carleen J. Sanders, Project Manager Plant Licensing Branch 1-2 Division of Operating Reactor Licensing Office of Nuclear Reactor Regulation Docket No. 50-336

Enclosure:

As stated cc wfencl: Distribution via Listserv Distribution:

RidsAcrsAcnw_MailCTR Resource RidsNrrDorlDpr Resource RidsNrrDorlLpl1-2 Resource RidsNrrDCIEsgb Resource RidsNrrLAABaxter Resource RidsNrrPMMilistone Resource RidsOgcRp Resource RidsRgn1 MailCenter Resource Branch Reading AJohnson, NRR PUBLIC ADAMS Accession No.: ML120760034 *via memo dated IOFFIC DCI/ESGB/BC LPL 1-2/BC LPL 1-2/PM I NAME I CSanders I ABaxter GKulesa MKhanna CSanders DATE 3/21/12 I 3/21/12 3/27112 3/27/12 3/27/12 OffiCial Record Copy