Document: NRC Regulatory Guide
Document ID: d812c779-c17b-4eb3-9d66-b532cd68bd03
Document Type: regulatory_guide
Title: Decommissioning Planning During Operations + HISTORY - HISTORY 12/2011 – DG-4014 , Proposed New Guide
Source: NRC Regulatory Guide Division 4
Source URL: https://www.nrc.gov/docs/ML1115/ML111590642.pdf
Revision Date: 2023-06
Chapter: 
Section ID: RG-4.22
CFR Part: 
CFR Title: 

Content:
n to meet the unrestricted release criteria of 10 CFR 20.1402. However, records of surveys performed that demonstrate that the residual radioactivity has not exceeded the level of significant residual radioactivity may be useful in demonstrating compliance. 6. All licensees must document the results of the surveys required by 10 CFR 20.1501(a) in records important to decommissioning in accordance with 10 CFR 20.1501(b). The DPR modifies the recordkeeping provisions of 10 CFR 20.1501. It requires that licensees maintain survey results with records important to decommissioning until license termination. Licensees may do this either by physical colocation or by reference to other readily available record files. It does not require licensees to submit reports of survey results. 7. The DPR does not require licensees to perform any dose analyses; however, licensees can use dose assessments on a site-specific basis to determine whether the amount of residual radioactivity is significant with respect to meeting the radiological criteria for unrestricted use in § 20.1402. Alternatively, a licensee should make a reasonable effort to estimate the amount of the identified residual radioactivity that would require remediation to meet the release for unrestricted use criteria of 10 CFR 20.1402 at the time it intends to terminate the license. Consideration should be given to the following: a. the radionuclides in the source term, b. actual and potential migration, both vertical and horizontal, c. dilution and natural attenuation, and d. radioactive decay. DG-4014, Page 14 Licensees can estimate the amount of significant residual radioactivity by comparing the concentrations and exposure rates they measure with readily available data to determine if they may need to conduct remediation to meet release for unrestricted use criteria for license termination. Available sources for this comparison include the following: a. Table 2 of Appendix B to 10 CFR Part 20, “Annual Limits on