Document: NRC Regulatory Guide
Document ID: 05969442-49ea-4f4a-a9e2-de3a14628b5e
Document Type: regulatory_guide
Title: Minimization of Contamination and Radioactive Waste Generation:  Life-Cycle Planning - HISTORY 07/2013 – Periodic Review of Revision 0 – No issues identified
Source: NRC Regulatory Guide Division 4
Source URL: https://www.nrc.gov/docs/ML0805/ML080500187.pdf
Revision Date: 2023-06
Chapter: 
Section ID: RG-4.21
CFR Part: 
CFR Title: 

Content:
ines in temporary and/or mobile systems should have self-sealing quick disconnects as well as a means to promptly isolate leaks. These systems should incorporate operational interlocks to minimize the possibility of leakage and contamination. Designs should ensure that spills and leaks from skid-mounted systems will be contained and routed to radioactive waste drains. s. Material selection for SSCs should consider the operating environment and intended means of disposal. The design and materials for reinforced concrete structures as well as piping, liners, bolts, and other items used for the storage and transport of radioactive liquids should be appropriate to mitigate cracking, adverse chemical reactions, and other degradation mechanisms that can result in leakage. The selection of radiation-damage-resistant materials for use in high- radiation areas can reduce the need for frequent replacement and can decrease the probability of contamination from leakage. Where appropriate, the surfaces of concrete structures and components should be sealed to facilitate cleaning and decontamination. t. Surfaces and expansion joints can be decontaminated more expeditiously if they are pretreated to provide a smooth, nonporous surface that is free of cracks, crevices, and sharp corners. These desirable features can be achieved by specifying appropriate design instructions, giving attention to finishing work during construction or manufacture, and using appropriate sealers on surfaces where contamination can be anticipated. Seals should be maintained over the life of the facility, and their integrity should be routinely inspected, to ensure that spills and leaks on the floors do not enter unmonitored areas beneath the floors and foundations. u. 10 CFR 20.1406 applicants should also ensure that concrete block walls designed to enable the future removal of large components for maintenance or replacement are completely sealed to prevent the intrusion of radioactive materials into the