Document: NRC Regulatory Guide
Document ID: 96baa826-d3bb-478b-8f38-e74500f6d433
Document Type: regulatory_guide
Title: 06/2009 (Rev. 2)
Source: NRC Regulatory Guide Division 1
Source URL: https://www.nrc.gov/docs/ML0911/ML091170109.pdf
Revision Date: 2023-06
Chapter: 
Section ID: RG-1.21
CFR Part: 
CFR Title: 

Content:
ectiveness of the radioactive effluent control program is not reduced, should be maintained in site documentation. Regardless of the surveillance frequencies, if activity is detected when monitoring a less-significant release point, the licensee must (per 10 CFR Part 50.36a and 10 CFR Part 50, Appendix I, Section III.A.1) report the cumulative activity in the effluent totals (i.e., in Table A-1 or Table A-2) in the ARERR (provided that the amount discharged is significant to the three-digit exponential format required for the ARERR). Rev. 2 of RG 1.21, Page 11 Site documentation should identify less-significant release points, to the extent reasonable, but it is not necessary to list all possible release points in site documentation. Releases from a less-significant release point may be assessed (see section 5.1, “Bounding Assessments”) to the extent reasonable using assumptions and bounding calculations (in lieu of, or in addition to, sampling and analysis). When plant conditions change, and such changes may reasonably affect the status of a less-significant release point (e.g., significant change in primary-to-secondary leakage in PWRs or substantial cross-contamination between systems), sampling and analysis of the affected less-significant release points should be conducted. These sample results should be evaluated to (1) confirm the continued validity of the bounding calculations (if used) regarding effluent accountability and (2) determine the impact (if any) on effluent accountability. The guidance in this regulatory guide regarding monitoring less-significant release points for purposes of accountability (via the ARERR) does not replace, supersede, or otherwise modify any responsibility for monitoring systems normally not contaminated, as outlined in NRC Inspection and Enforcement (IE) Bulletin 80-10, “Contamination of Nonradioactive System and Resulting Potential for Unmonitored, Uncontrolled Release of Radioactivity to Environment,” dated May 6,