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:
sidered for evaluating gross failures of the fortified systems. Accordingly, higher dose criteria have been considered appropriate for evaluating gross failure of these fortified systems. Initially, a 5-rem criterion was used, but more recently the value has been 2.5 rem. For systems not designed to withstand explosions and earthquakes, the criterion has been 0.5 rem.94 This dichotomy in having different dose criteria for systems designed to withstand explosions and earthquakes and systems not designed to withstand such events had led to a problem in that system malfunctions appear to be the controlling failure mode and resistance to explosions and earthquakes provide no protection against operator error and system malfunction. No system-malfunction type failures have been designated as representative. However it appears that an event, such as valve misalignment or overpressure could give a release approximating that from the rupture of a tank or pipe. Therefore, it was considered that for future safety evaluations the waste gas system failures analyzed could be limited to tank or pipe ruptures but that the dose criterion in every case should be 0.5 rem 25 mSv (2.5 rem) at the exclusion boundary.95 The purpose of this BTP is to provide guidelines on postulated radioactive releases due to a radioactive waste gas system leak or failure. The goal is to minimize potential radiation exposures to workers and the public, and to provide reasonable assurance that the radiological consequences of a single failure of an active component in the waste gas system would not result in exceeding the guidelines of 10 CFR Part 20 for a unique unplanned release and would, therefore, be substantially below the guidelines a small fraction (i.e., 10%) of 10 CFR Part 100 limit for whole body dose to any offsite individual for a postulated event.96 The criteria in Section B, below, provide adequate and acceptable design solutions for the concerns outlined above. This position paper sets