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:
ific procedures) and (2) update the ODCM within a reasonable timeframe (e.g., yearly). Releases from a significant release point should be assessed based on an appropriate combination of actual sample analysis results, radiation monitor responses, flow rate indications, tank level indications, and system pressure indications as necessary to ensure that the amount of radioactive material released, and the corresponding doses, are not substantially underestimated (see 10 CFR Part 50, Appendix I, Section III, “Implementation”). If activity is detected when monitoring a significant release point, the radionuclides detected should be reported in the effluent totals (including those with half-lives less than 8 days) in the ARERR (i.e., in Table A-1 or Table A-2), provided that the amount discharged is significant to the three-digit exponential format required for the ARERR. 1.4 Monitoring a Less-Significant Release Point NUREG-1301/1302 provides tables designating sampling and analysis frequencies for release points. Historically these tables together with the guidance from Revision 1 of RG 1.21 provided the sampling and analysis frequencies. Licensees may continue to use this guidance from NUREG-1301 and NUREG-1302 and Revision 1 of RG 1.21. This method of assigning sample frequencies is simple to implement, but in certain cases, it may entail an inappropriately large number of samples for less- significant release points which have no – or extremely low – impact on the parameters reported in the ARERR. As a result, for less-significant release points, licensees may evaluate and assign more appropriate sample frequencies. If a licensee wishes to deviate from the sample frequencies listed in NUREG-1301 and NUREG-1302, the licensee’s evaluation, showing that the effectiveness 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