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:
monitor variables and systems to assure adequate safety, including those variables and systems that can affect the fission process, the integrity of the reactor core, and the reactor coolant pressure boundary. The process sampling system is relied upon to provide water and gaseous samples from the reactor coolant system and associated auxiliary systems during all normal modes of operation. The post-accident sampling system provides the capability to obtain and analyze reactor coolant and containment atmosphere samples to determine the extent of core degradation following an accident. Satisfying the requirements of GDC 13 for the process and post-accident sampling systems ensures important information is provided for evaluating whether safety systems and other systems important to safety are performing their intended safety functions i.e., reactivity control, fuel cladding integrity, maintaining reactor coolant system integrity, and maintaining containment integrity. 5. GDC 14 requires that the reactor coolant pressure boundary be designed, fabricated, erected, and tested so as to have an extremely low probability of abnormal leakage, of rapidly propagating failure, and of gross rupture. The process and post-accident sampling systems are relied upon during normal operating, transient and postulated accident conditions to provide primary and secondary water chemistry data. Verification that key chemistry parameters, such as chloride, hydrogen and oxygen concentrations, are within prescribed limits and that impurities are properly controlled provides assurance that the many mechanisms for corrosive attack will be mitigated and will not adversely affect the reactor coolant pressure boundary. Minimizing the potential for corrosive chemical attack increases plant safety by decreasing the probability that the 9.3.2-9 DRAFT Rev. 3 - April 1996 reactor coolant pressure boundary will be compromised due to degradation from corrosive chemical attack. 6. GDC 26 establishes