Document: NRC Regulatory Guide
Document ID: c0dbb594-6262-4b83-96b1-366758ad9676
Document Type: regulatory_guide
Title: Interim Licensing policy on as low as Practicable for Gaseous Radiodine Releases from Light-Water-Cooled Nuclear Power Reactors (Rev. 1)
Source: NRC Regulatory Guide Division 1
Source URL: https://www.nrc.gov/docs/ML1229/ML12298A137.pdf
Revision Date: 2023-06
Chapter: 
Section ID: RG-1.42
CFR Part: 
CFR Title: 

Content:
s on a modified Appendix I and five draft regulatory guides which provide models and parameters acceptable to the Regulatory staff for calculating average expected releases of radioactive materials in liquid and gaseous effluents from normal operations, and calculational models and parameters used to estimate doses for purposes of implementing the guidance on design objectives and limiting conditions of operation in Appendix I. Those five guides will be issued by the Regulatory staff at some time following the adoption of a final rule by the Commission. At that time Regulatory Guide 1.42 will be withdrawn. Pending conclusion of the proposed Appendix I rule making proceeding and the Commission's decision on an effective rule, Regulatory Guide 1.42, Q Revision 1, provides interim guidance to aid applicants in implementing §§20.1(c), 50.34a, and 50.36a of the Commission's regulations with respect to keeping radioactive iodine releases in gaseous effluents from LWR plants as low as practicable. The revision of this guide reflects the position of the Regulatory staff with respect to radioiodine released in gaseous effluents as presented in its Concluding Statement of Position in the rule making proceeding. This guide may be used for LWR plants currently in the construction permit and operating licensing review stages as well as plants for which construction permit applications are received in the immediate future. B. DISCUSSION The experience of the Regulatory staff in administering §§20.1(c), 50.34a, and 50.36a of 10 CFR Parts 20 and 50 has shown that, in most cases, the calculated limiting dose in achieving as low as practicable releases of radioactive material in gaseous effluents from LWR plants 1.42-2 is the potential dose to a child's thyroid due to radioactive iodine taken into the body of the child by ingestion of locally produced milk. Features of the five draft guides appended to the Concluding Statement of Position which are germane to guidance for