ML111590890
| ML111590890 | |
| Person / Time | |
|---|---|
| Site: | Millstone  |
| Issue date: | 06/14/2011 |
| From: | Sanders C Plant Licensing Branch 1 |
| To: | Heacock D Dominion Nuclear Connecticut |
| Sandeers, Carleen, NRR/DORL, 415-1603 | |
| References | |
| TAC ME5962 | |
| Download: ML111590890 (3) | |
Text
UNITED STATES NUCLEAR REGULATORY COMMISSION WASHINGTON, D.C. 20555-0001 June 14. 2011 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 RELIEF REQUEST FOR IMPLEMENTATION OF A RISK-INFORMED INSERVICE INSPECTION PROGRAM (TAC NO. ME5962)
Dear Mr. Heacock:
By letter dated March 30, 2011 (Agencywide Document Access and Management System (ADAMS) Accession No. ML110900670), Dominion Nuclear Connecticut, Inc. submitted Relief Request RR-04-11 for Millstone Power Station, Unit No.2 (MPS2). Relief Request RR-04-11 proposes to implement a risk-informed/safety-based inservice inspection (lSI) program for MPS2 during the entire fourth 1 O-year lSI interval. In order to complete its review, the Nuclear Regulatory Commission staff requests a response to the enclosed question.
The draft question was sent to Ms. Wanda Craft, of your staff, to ensure that the question was understandable, the regulatory basis for the question was clear, and to determine if the information was previously docketed. On June 7, 2011, Ms. Craft agreed that you would provide a response by July 8, 2011.
If you have any questions regarding this matter, please contact me at 301-415-1603.
Sincerely, c~nJ\\ ;nders,~anager Plant LiCen~ing 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 Listserv
OFFICE OF NUCLEAR REACTOR REGULATION REQUEST FOR ADDITIONAL INFORMATION IMPLEMENTATION OF A RISK*INFORMED INSERVICE INSPECTION PROGRAM FOR THE FOURTH 10*YEAR INSPECTION INTERVAL MILLSTONE POWER STATION. UNIT NO.2 DOCKET NUMBER: 50-336 By letter dated March 30, 2011 (Agencywide Document Access and Management System (ADAMS) Accession No. ML110900670), Dominion Nuclear Connecticut, Inc. (the licensee),
submitted Relief Request RR-04-11 for Millstone Power Station, Unit No.2 (MPS2). Relief Request RR-04-11 proposes to implement a risk-informed/safety-based inservice inspection (lSI) program for MPS2 during the entire fourth 10-year lSI interval. The 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.
RAI-01:, Table 1.1, "PRA [probabilistic risk assessment] Quality Gap Analysis: MPS2," of the licensee's March 30, 2011, submittal indicates that multi unit flood areas and scenarios were not modeled for the MPS2 internal flooding PRA (item IFPP-A3). Please provide an explanation for why multi-unit flood areas and scenarios are not relevant for MPS2, and discuss implications to the lSI program risk assessment for any shared systems not modeled in the flooding PRA.
Enclosure
June 14, 2011 Mr. David A. Heacock President and Chief Nuclear Officer Dominion Nuclear Connecticut, Inc.
Innsbrook Technical Center SOOO Dominion Boulevard Glen Allen, VA 23060-6711 SUB~IECT:
MILLSTONE POWER STATION, UNIT NO.2 - REQUEST FOR ADDITIONAL INFORMATION REGARDING RELIEF REQUEST FOR IMPLEMENTATION OF A RISK-INFORMED INSERVICE INSPECTION PROGRAM (TAC NO. MES962)
Dear Mr. Heacock:
By letter dated March 30, 2011 (Agencywide Document Access and Management System (ADAMS) Accession No. ML110900670), Dominion Nuclear Connecticut, Inc. submitted Relief Request RR-04-11 for Millstone Power Station, Unit No.2 (MPS2). Relief Request RR-04-11 proposes to implement a risk-informed/safety-based inservice inspection (lSI) program for MPS2 during the entire fourth 10-year lSI interval. In order to complete its review, the Nuclear Regulatory Commission staff requests a response to the enclosed question.
The draft question was sent to Ms. Wanda Craft, of your staff, to ensure that the question was understandable, the regulatory basis for the question was clear, and to determine if the information was previously docketed. On June 7,2011, Ms. Craft agreed that you would provide a response by July 8, 2011.
If you have any questions regarding this matter, please contact me at 301-41S-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. SO-336
Enclosure:
As stated cc w/encl: Distribution via Listserv Distribution:
RidsAcrsAcnw_MailCTR Resource RidsNrrDorlDpr Resource RidsNrrDorlLpl1-2 Resource RidsNrrDCICpnb Resource RidsNrrLAABaxter Resource RidsNrrPMMillstone Resource RidsOgcRp Resource RidsRgn1 MailCenter Resource Branch Reading PUBLIC ADAMS Accession No*.. ML111590890
- Memo dated I OFFICE LPL1-2/PM LPL 1-2/LA DRAlAPLAlBC LPL1-2/BC i NAME CSanders ABaxter DHarrison HChernoff
- DATE 6/13/11 6/13/11 05/10/2011
- 6114/11 OffiCial Record Copy