Document: NUREG-0800
Document ID: c0c5657a-82df-46c2-8cb5-fad0fd37fb58
Document Type: srp
Title: GASEOUS WASTE MANAGEMENT SYSTEMS1
Source: NUREG-0800
Source URL: https://www.nrc.gov/docs/ML0520/ML052070610.pdf
Revision Date: 2023-06
Chapter: 11
Section ID: 11.3
CFR Part: 
CFR Title: 

Content:
as system storage tank or main decay position of the system., and It should further be assumed that the effluent resulting from the postulated event will be released to the environs without continuous effluent radiation monitoring to automatically isolate and/or terminate the effluent release. Also, gGround-level release without credit for a building wake factor should be assumed, and a conservative (5%) short-term diffusion estimate for the Value (X/Q) determined by a method outlined in the acceptance criteria in SRP Section 2.3.4, should be assumed. No deposition is assumed to occur during downwind transport.100 II. Staff Method for Analysis a) Pressurized Storage Tanks: The safety analysis for the radiological consequences, of a single failure of an active component in a waste gas system, with compressed gas storage (holdup or decay) tanks or cover gas tanks assumes that the tank being filled has a major leak to the environs. The radioactive noble gas inventory in the tank, at 100% capacity, should be determined based on the system design capacity source term using the parameters and principal components considered for pretreatment and collection of waste gas to the waste gas system tanks during normal operation, including anticipated operational occurrences. To determine the pressurized storage tank noble gas inventory, the staff method of calculation alters the PWR-GALE Code (NUREG-0017) and requires manual calculations to determine the radiological impact. 1) Enter a value of zero for the "Holdup Time, in days, for Xe." 2) Enter a value of zero for the "Holdup Time, in days, for YKr." 3) Check the value entered for "Fill Time, in days." This should be the average volume for all storage or cover gas tanks. If this is a cover gas system, calculate the effective fill time based on 20% of the liquid tank volumes. (Charcoal delay systems are not applicable.) The PWR-GALE Code limits the minimum fill time to 0.01 days. 4) Rerun the computer program for this analysis