Document: NUREG-0800
Document ID: 04c894f5-e3ab-479e-8bca-0722777c79a7
Document Type: srp
Title: Revision 4 – January 2016
Source: NUREG-0800
Source URL: https://www.nrc.gov/docs/ML1502/ML15027A401.pdf
Revision Date: 2023-06
Chapter: 11
Section ID: 11
CFR Part: 
CFR Title: 

Content:
waste in tanks and components vary among plant systems. The LWMS tanks usually contain less liquid than condensate storage tanks and refueling water storage tanks. For LWMS, the amounts are typically on the order of a few to several thousand gallons, while the volumes of condensate storage tanks and refueling water storage tanks are typically on the order of several hundred thousand gallons. The volumes of tanks used in other plant systems are typically on the order of a few thousand gallons or less. Similarly, the inventories of radioactivity vary, with higher radionuclide concentrations found in LWMS tanks and components, and lower concentrations observed in condensate storage tanks and refueling water storage tanks. Finally, the use of skid-mounted processing equipment connected to permanently installed LWMS and possible failures associated with system interfaces should be evaluated to confirm whether the system tank and/or components selected for the analysis are conservatively bounding in terms of the total inventory of radioactive materials assumed in the failure scenario. The health physics staff should account for these aspects and their interrelationships when confirming whether the applicant has selected (a) a case that assumes the highest release of radioactivity to the environment, or (b) an event involving plant systems and inventories of radioactive materials associated with system designs that exclude the use of mitigating features. 2. Mitigating Design Features The health physics staff will consider the use of design features (e.g., steel liners or walls in areas housing components, dikes for outdoor tanks, and overflow and sump/drain provisions incorporated to mitigate the effects of a postulated tank and components failure). The types of failed system components typically are waste collection tanks or sample tanks, among others. However, the components selected for the analysis should reflect the specific design features of the plant, as described