Letter Sequence RAI |
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TAC:ME6789, Relocate Surveillance Frequencies to Licensee Control - RITSTF Initiative 5B (Approved, Closed) TAC:ME6790, Relocate Surveillance Frequencies to Licensee Control - RITSTF Initiative 5B (Approved, Closed) |
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MONTHYEARCP-201101108, Supplement to License Amendment Request 11-001, Application for Technical Specification Change Regarding Risk-Informed Justification for the Relocation of Specific Surveillance Frequency Requirements to a License..2011-08-17017 August 2011
Supplement to License Amendment Request 11-001, Application for Technical Specification Change Regarding Risk-Informed Justification for the Relocation of Specific Surveillance Frequency Requirements to a License..
Project stage: Supplement
ML1123509342011-08-23023 August 2011
Acceptance Review Email, License Amendment Request to Relocate Specific Surveillance Frequencies from Technical Specifications to a Licensee Controlled Program
Project stage: Acceptance Review
ML1129901462011-10-26026 October 2011
Request for Additional Information, Amendment Request to Adopt TSTF-425-A, Rev. 3, Relocate Surveillance Frequencies to Licensee Control - Risk Informed Technical Specification Task Force (RITSTF) Initiative 5b
Project stage: RAI
ML1129901252011-10-26026 October 2011
Email, Request for Additional Information, Amendment Request to Adopt TSTF-425-A, Rev. 3, Relocate Surveillance Frequencies to Licensee Control - Risk Informed Technical Specification Task Force (RITSTF) Initiative 5b
Project stage: RAI
CP-201101565, Response to Request for Additional Information, Risk Informed Justification for the Relocation of Specific Surveillance Frequency Requirements to Licensee Controlled Program - Tacs ME6789 and ME67902011-11-0909 November 2011
Response to Request for Additional Information, Risk Informed Justification for the Relocation of Specific Surveillance Frequency Requirements to Licensee Controlled Program - Tacs ME6789 and ME6790
Project stage: Response to RAI
ML12067A2442012-06-29029 June 2012
Issuance of Amendment Nos. 156 and 156, Adoption of TSTF-425-A, Rev. 3, Relocate Surveillance Frequencies to Licensee Control - Risk Informed Technical Specifications Task Force (RITSTF) Initiative 5b
Project stage: Approval
ML22208A1582022-07-29029 July 2022
Correction to Issuance of Amendment Nos. 156 and 156 Relocation of Surveillance Frequencies from the Technical Specifications to a Licensee-Controlled Document
Project stage: Approval
2011-08-17
[Table View] |
Text
Request for Additional Information
- 1. The summary of finding and observation (F&O) 2-13 for supporting requirement (SR) AS-A7 identifies that the documentation of assumptions and key sources of uncertainty for accident sequence modeling is incomplete, and two examples are provided by the peer reviewer. The disposition of this F&O was to specifically address these two examples, but there is no discussion of any review to identify other sources of uncertainty not documented. Since the peer review identifies the two specific items as examples, the U. S. Nuclear Regulatory Commission's (NRC) staff would not expect the licensee to close out this F&O until a more thorough review was conducted to assure all sources of uncertainty and assumptions are identified and discussed in the documentation.
Please discuss how this F&O was reviewed to determine the extent of condition for missing assumptions and key sources of uncertainty related to accident sequence modeling.
- 2. The summary of F&O 4-31 for SR QU-F4 states that the effect of sources of uncertainty on the Probabilistic Risk Assessment (PRA) model is not clear. The resolution states that the documentation identifies the application of an industry guidance document to the evaluation of uncertainties. This does not seem to address the underlying issue that the documentation should characterize sources of uncertainty and assumptions underlying the PRA model.
Please clarify how this F&O was addressed to assure characterization of sources of uncertainty and assumptions on the effects on the PRA model is described in the documentation.
