ML111540275
| ML111540275 | |
| Person / Time | |
|---|---|
| Site: | Millstone  |
| Issue date: | 06/03/2011 |
| From: | Office of Nuclear Reactor Regulation |
| To: | Dominion Nuclear Connecticut |
| Hughey J, NRR/DORL, 301-415-3204 | |
| Shared Package | |
| ml111540267 | List: |
| References | |
| RR-04-11, TAC ME5962 | |
| Download: ML111540275 (1) | |
Text
DRAFT DRAFT 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. (DNC or 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 (ISI) program for MPS2 during the entire fourth 10-year ISI interval. The Nuclear Regulatory Commission (NRC) 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.
, Table 1.1, PRA [probabilistic risk assessment] Quality Gap Analysis: MPS2, of the licensees 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 ISI program risk assessment for any shared systems not modeled in the flooding PRA.
RAI -01: Please provide an explanation for why multi-unit flood areas and scenarios are not relevant for MPS2, and discuss implications to the ISI program risk assessment for any shared systems not modeled in the flooding PRA.