Document: NUREG-0800
Document ID: e1c5261f-4ef6-4478-8cf0-015611057574
Document Type: srp
Title: and 9.3.2, “Process and Post-accident Sampling Systems.”  The review addresses
Source: NUREG-0800
Source URL: https://www.nrc.gov/docs/ML1502/ML15029A039.pdf
Revision Date: 2023-06
Chapter: 11
Section ID: 11.5
CFR Part: 
CFR Title: 

Content:
Ls of Part 20, Appendix B and doses to members of the public. 4. The review of the GWMS design capacity will encompass the following major areas: A. The capability of the GRS to process gaseous wastes in the event of a single major equipment item failure. For nonredundant equipment or components, a 3-week downtime every other year will be assumed (10 days per year average). B. The total system capability to process gaseous wastes at design-basis source term levels is evaluated based on information discussed in SRP Section 11.1, and in this SRP section. The source term is based on a combination of assumptions of failed fuel fractions, BWR offgas release rates, TS limits for halogens and noble gases, presence of activation and corrosion products, and steam generator TS limits on allowable primary-to-secondary leakage rates. The design basis of the reactor coolant and reactor steam source terms is based on: 1) an offgas system noble gas release rate of 3.7 megabecquerels per second per megawatt thermal (MBq/s per MWt) (100 microcuries (μCi)/s per MWt) measured or estimated after a 30-minute delay for BWRs; 2) an assumed 1 percent fuel cladding defects for PWRs; and 3) technical specification limits for halogens (I-131 dose equivalent) and noble gases (Xe-133 dose equivalent), as defined in plant-specific TS. C. The operational flexibility designed into the GRS (e.g., cross-connections between systems, redundant or reserve processing equipment, and reserve storage capacity, including the use of mobile processing and treatment systems). D. In the evaluation of charcoal delay systems for radioactive gas decay, the number of beds or tanks, bed or tank volumes and dimensions, mass of charcoal in each bed or tank, charcoal mesh size and bulk density, processing flow rates, temperatures, pressures, humidity, and dynamic adsorption coefficients are used to calculate the effective holdup times meeting or exceeding the performance criteria of RG 1.112 and guidance of NUREG-0016