Document: NUREG-0800
Document ID: c37e8c68-ed08-434b-b15c-438f1915858a
Document Type: srp
Title: PROCESS AND POST-ACCIDENT SAMPLING SYSTEMS
Source: NUREG-0800
Source URL: https://www.nrc.gov/docs/ML0520/ML052070526.pdf
Revision Date: 2023-06
Chapter: 9
Section ID: 9.3.2
CFR Part: 
CFR Title: 

Content:
g an accident provides important information necessary to the operators efforts to assess and control the plant during the course of an accident. Critical information regarding core damage and coolant 9.3.2-11 DRAFT Rev. 3 - April 1996 characteristics can be obtained through radiological and chemical analysis of primary coolant liquid and gas samples. Additional information concerning core damage and the potential for a hydrogen reaction in containment can be obtained from an analysis of a containment atmosphere sample. Meeting the guidance of TMI Action Plan Item II.B.3 as clarified in NUREG-0737, as it relates to the design of the post-accident sampling systems, ensures that important sample information can be obtained and analyzed promoting rapid accident diagnosis, improving operator control and enhancing public safety. 12. TMI Action Plan Item III.D.1.1 of NUREG-0737 requires a program and provisions for leakage control and detection for systems outside containment that contain (or might contain) source term radioactive materials following an accident. 10 CFR 50.34(f)(2)(xxvi) establishes equivalent requirements for those applicants subject to 10 CFR 50.34(f). The process and post accident sampling systems provide a means for sampling the reactor coolant systems and containment atmosphere to provide information necessary to assess and control the plant under accident conditions. Because these systems draw samples directly from the reactor coolant systems or from the containment atmosphere they have a potential for containing source term radioactive material during the course of an accident. To prevent unnecessarily high exposures to workers and the public and to maintain control and use of the systems during an accident a program should be implemented to minimize leakage from these systems to as low as practical levels. Meeting the guidance of TMI Action Plan Item III.D.1.1 as clarified in NUREG-0737, as it relates to the process and post accident sampling