Document: NUREG-0800
Document ID: f7c58873-6f34-4f88-8e26-90fc2e310d25
Document Type: srp
Title: PROCESS AND POST-ACCIDENT SAMPLING SYSTEMS
Source: NUREG-0800
Source URL: https://www.nrc.gov/docs/ML0706/ML070680137.pdf
Revision Date: 2023-06
Chapter: 9
Section ID: 9.3.2
CFR Part: 
CFR Title: 

Content:
d and the parameters to be determined through sampling (e.g., gross beta-gamma concentration, boric acid concentration). 2. The system descriptions for the PSS are reviewed at the OL stage. The review includes (a) piping and instrumentation diagrams, (b) provisions for obtaining representative samples, (c) the location of sampling points and sample stations, and (d) provisions for purging sampling lines. 3. The seismic design and quality group classifications of piping and equipment, and the bases for the classifications chosen are reviewed at the CP stage. At the OL stage, the review includes design and expected temperatures and pressures and the materials of construction of system components. 4. The isolation provisions for the system and the means provided to limit radioactive releases by minimizing reactor coolant losses are reviewed at the CP stage. 5. The PSS operational procedures for sampling the reactor coolant and containment atmosphere to determine the capability to promptly obtain samples for chemical and radiochemical analyses are reviewed. 6. The post-accident sampling system (PASS) is not mandatory. In some designs, such as the certified design for the AP1000 plant, approved by the NRC, PASS has been eliminated (NRC letter to Combustion Engineering (CE) Owners Group dated May 16, 2000). Although the PSS in the designs such as the AP1000 plant does not have a specific post-accident sampling capability, their design allows for the collection and analysis of highly radioactive samples for boron, containment pH, and containment atmosphere for hydrogen and other fission products. Subject to meeting the following conditions, the PSS could collect highly radioactive samples. In lieu of the PASS, the following actions are required to qualify process sampling for taking radioactive samples without having a specific post-accident sampling capability: A. Establish the capability for classifying a fuel damage event at the Alert level threshold B. Develop