ML24136A168
| ML24136A168 | |
| Person / Time | |
|---|---|
| Issue date: | 05/29/2024 |
| From: | Joseph Kanney, Nebiyu Tiruneh NRC/NRR/DEX/EXHB, NRC/RES/DRA/FXHAB |
| To: | |
| Shared Package | |
| ML24136A124 | List: |
| References | |
| RG-1.113, Rev. 1 | |
| Download: ML24136A168 (2) | |
Text
Regulatory Guide Periodic Review Regulatory Guide Number:
1.113, Revision 1
Title:
Estimating Aquatic Dispersion of Effluents from Accidental and Routine Reactor Releases for the Purpose of Implementing Appendix I Office/Division/Branch:
NRR/DEX/EXHB, RES/DRA/FXHAB Technical Lead:
Nebiyu Tiruneh (EXHB), Joseph Kanney (FXHAB)
Staff Action Decided:
Reviewed with issues identified for future consideration
- 1.
What are the known technical or regulatory issues with the current version of the Regulatory Guide (RG)?
Revision 1 of Regulatory Guide (RG) 1.113 (Agencywide Documents Access and Management System (ADAMS) Accession No. ML003740390), Estimating Aquatic Dispersion of Effluents from Accidental and Routine Reactor Releases for the Purpose of Implementing Appendix I, was issued in April 1977. RG 1.113 provides guidance and discussion of analytic solutions to aquatic dispersion of liquid effluents for the sole purpose of implementing Appendix I to Title 10 of the Code of Federal Regulations (10 CFR) 50, Numerical Guides for Design Objectives and Limiting Conditions for Operation to Meet the Criterion As Low as is Reasonably Achievable for Radioactive Material in Light-Water-Cooled Nuclear Power Reactor Effluents. The last revision of the RG dates to 1977, which means that Section A, "Introduction," Section B, "Discussion," and Section D, "Implementation" are outdated. However, for the intended purpose, the technical guidance remains appropriate and can be used until the other sections are updated.
- 2.
What is the impact on internal and external stakeholders of not updating the RG for the known issues, in terms of anticipated numbers of licensing and inspection activities over the next several years?
There is no immediate impact on stakeholders of not updating the RG at this time. The Nuclear Regulatory Commission (NRC) staff and external stakeholders are currently using software that was developed by the NRC (e.g., LADTAP II) or functionally similar commercial software to implement their programs to meet the requirements of Appendix I to 10 CFR 50.
The American Nuclear Society (ANS) has initiated development of standard ANS-2.18, "Standards for Evaluating Radionuclide Transport in Surface Water for Nuclear Power Sites," that is expected to encompass the entire scope of the RG. The NRC will consider referencing or endorsing this standard in the next revision of the RG. There is no impact of not updating the RG prior to release of ANS-2.18
- 3.
What is an estimate of the level of effort needed to address identified issues in terms of full-time equivalent (FTE) and contractor resources?
The main effort in revising RG 1.113 to address the issues identified (see answer to Question 1) will be in reviewing the content of ANS-2.18 to determine which sections the NRC staff will endorse in whole, or in part, and implement necessary changes in a revised RG 1.113. Resources required are estimated to be 0.1 FTE of NRC staff time.
No contract dollars are anticipated to be needed.
- 4.
Based on the answers to the questions above, what is the staff action for this guide (Reviewed with no issues identified, Reviewed with issues identified for future consideration, Revise, or Withdraw)?
Reviewed with issues identified for future consideration.
- 5.
Provide a conceptual plan and timeframe to address the issues identified during the review.
ANS-2.18 is currently being drafted and the ANS aims to publish the standard in July 2027. If ANS-2.18 is published by July 2027, NRC staff plans to review the new standard and revise RG 1.113 by July 2028.
NOTE:
This review was conducted in April 2024 and reflects the staffs plans as of that date. These plans are tentative and subject to change.