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:
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 requirements regarding reliably controlling the rate of reactivity changes. In PWRs, the sampling systems are utilized to verify the boron concentration, necessary for the control of the rate of reactivity changes, by sampling the reactor coolant, the boric acid storage tanks, and the refueling water storage tank. In BWRs, the sampling systems are used to verify the boron concentration in the standby liquid control system which may be used to maintain the reactor subcritical under cold conditions in the event that the control rod system is inoperable. Meeting the requirements of GDC 26, as it relates to the sampling systems, ensures sampling and evaluation of boron concentrations used to control the rate of reactivity changes through the injection of borated water into the RCS, enhancing plant safety by: 1) meeting the combined reactivity control system redundancy and capability requirements, and 2) not exceeding acceptable fuel design limits. 7. GDC 41 requires that systems to control fission products, hydrogen, oxygen, and other substances that may be released into the reactor containment be provided as necessary to reduce the concentration and quality of fission products released to the environment following postulated accidents. This requirement is met, in part, by using the process sampling system to determine the chemical concentration in the containment spray chemical additive tank. Determination that the chemical additive concentration is within limits ensures that a sufficient chemical supply is available during postulated accidents to meet elemental iodine removal requirements and material compatibility requirements. In addition, the process and post-accident sampling systems are relied upon to sample and evaluate the conditions inside containment resulting