Document: NRC Regulatory Guide
Document ID: cde52d5a-adf9-49be-9d1f-59449dfca895
Document Type: regulatory_guide
Title: TRIAL - Acceptability of Probabilistic Risk Assessment Results for Non-Light Water Reactor Risk-Informed Activities
Source: NRC Regulatory Guide Division 1
Source URL: https://www.nrc.gov/docs/ML2123/ML21235A008.pdf
Revision Date: 2023-05
Chapter: 
Section ID: RG-1.247
CFR Part: 
CFR Title: 

Content:
e. RG 1.247, Appendix A, Page A-76 Table A-18. Staff Position on ASME/ANS RA-S-1.4-2021, Technical Requirements for Radiological Consequence Analysis Index No. Issue Position Resolution HLR-RCDO-B and HLR-RCDO-C ------------------------ No objection ---------------------------------- Table 4.3.17.5-2 RCDO-A1 The list of exposure pathways does not include skin absorption. This could be a significant pathway for isotopes that may be important for some designs (e.g., tritium). This is an issue for PRA quality because omission of skin absorption could underestimate doses in such cases. Qualification … JUSTIFY excluding any of the following pathways: (a) cloudshine; (b) groundshine; (c) skin deposition; (d) inhalation; (e) ingestion; (f) skin absorption RCDO-A2 through RCDO-A5 ------------------------ No objection ---------------------------------- RCDO-A6 This supporting requirement conflicts with the requirements of RCDO-A1, which requires the analyst to justify exclusion of the skin absorption and deposition pathways. This is an issue for PRA quality because the exclusion of these pathways without justification may result in underestimation of exposures if the excluded pathways were risk-significant Qualification CC-I DO NOT INCLUDE skin deposition pathway in the model. CC-II INCLUDE skin deposition and beta exposure to the skin from the plume in the model CC-I and CC-II MODEL skin absorption and deposition pathways. RCDO-A7 ------------------------ No objection ---------------------------------- RCDO-A8 This supporting requirement conflicts with the requirements of RCDO-A1, which requires the analyst to justify exclusion of ingestion pathways. This Qualification CC-I DO NOT INCLUDE ingestion pathways in the model. CC-II USE generic intake quantities RG 1.247, Appendix A, Page A-77 Table A-18. Staff Position on ASME/ANS RA-S-1.4-2021, Technical Requirements for Radiological Consequence Analysis Index No. Issue Position Resolution is an issue for PRA quality because