Document: NRC Regulatory Guide
Document ID: 5cdd8024-5f0a-4a1b-8e14-1026125c5667
Document Type: regulatory_guide
Title: Assumptions Used for Evaluating the Potential Radiological Consequences of a Pressurized Water Reactor Radioactive Gas Storage Tank Failure (Rev. 0)
Source: NRC Regulatory Guide Division 1
Source URL: https://www.nrc.gov/docs/ML0833/ML083300020.pdf
Revision Date: 2023-06
Chapter: 
Section ID: RG-1.24
CFR Part: 
CFR Title: 

Content:
nents, to an extent consistent with their importance to safety… The program shall take into account the need for special controls, processes, test equipment, tools, and skills to attain the required quality, and the need for verification of quality by inspection and test. The program shall provide for indoctrination and training of personnel performing activities affecting quality as necessary to assure that suitable proficiency is achieved and maintained.” In the following paragraphs, some potential problem areas are noted which are considered to merit special attention in the design of a radioactive gas storage system: 1. If there is a potential for hydrogen to build up in the gas storage system, special care should be taken to prevent air in-leakage to assure that an explosive mixture of hydrogen and oxygen does not accumulate in the decay tanks. 2. The gas storage system should be designed so that the tanks are isolated from each other during use to limit the quantity of gas released in the event of an accident by preventing the flow of radioactive gas between tanks. 3. A special effort should be made in the design of the overpressure relief system to minimize the likelihood of an inadvertent release occurring because of operator error or valve malfunction and to route piping to minimize any possible radiation exposure to onsite personnel from any gas vented from the system. 4. The gas storage system components should be located so as to minimize the likelihood of any system damage that could result in the release of stored gas due to the occurrence of a common industrial accident such as a vehicle out of control, a maloperating crane, a dropped object, etc. RG-1.24, Page 3 5. Since missiles generated externally by high winds are a potential cause of gas storage system damage, they should be considered even though the radiological consequences of such an accident would be mitigated by the high wind speed required to generate such missiles. C. REGULATORY