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:
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 only. DRAFT Rev. 3 - April 1996 11.3-20 5) Multiply each noble gas printout given, under "Gas Stripping - Continuous" by 7 the ratio of the noble gas concentration in the reactor coolant corresponding to 1% failed fuel to that noble gas concentration in the coolant given by GALE printout. This adjustment is to account for the design capacity source term correction.101 6) Divide the values in step 5 above by the number of tanks filled per year (equal to 365/value in step 3 above). This gives to the tank inventory Ai for each nuclide. 7) Calculate the radiological impact by the following equation: Dose (mrem) = E K A (X/Q)(10 pCi/Ci)/3.15X10 sec/year i i 12 7 where, A = The noble gas nuclide activity determined in i step 6 above, in curies/event. K = The total-body dose factor given as DFB in i i Table B-1 of Regulatory Guide 1.109, mrem-m /pCi/yr. 3 (X/Q) = The relative concentration at the nearest exclusion boundary given in Figure 1 of Regulatory Guide 1.24 for ground-level releases, in sec/m . 3 8) The sum dose shall be less than 25 mSv (2.5 rem) 500 mrem. Using the same parameters, the technical specifications will set a curie limit on a tank, based on the maximum of 25 mSv (2.5 rem) 500 mrem at the nearest exclusion boundary and using the same noble gas mixture.102 b) Charcoal Delay Units: The safety analysis for the radiological consequences of a single failure of an active component in a waste gas system with charcoal delay units assumes that the charcoal unit is bypassed with a 1-hour release to the environs. The staff considers that either a line bypass valve malfunction, control error, or bed bypass would require the remedial action by isolation, and that starting an alternate charcoal unit, if available, or reducing reactor power could take up to 2 hours. The