Document: NUREG-0800
Document ID: 52c595ba-bbc6-4bf7-8b9c-e72d77d3a95b
Document Type: srp
Title: AUXILIARY AND RADWASTE AREA VENTILATION SYSTEM
Source: NUREG-0800
Source URL: https://www.nrc.gov/docs/ML0520/ML052070543.pdf
Revision Date: 2023-06
Chapter: 9
Section ID: 9.4.3
CFR Part: 
CFR Title: 

Content:
oled nuclear power plants, Position C.2, and positions C.1 and C.2, respectively.44 Technical Rationale45 The technical rationale for application of these acceptance criteria to reviewing the ARAVS is discussed in the following paragraphs:46 1. Compliance with GDC 2, as related to the system being capable of withstanding the effects of earthquakes, requires that structures, systems, and components important to safety be designed to withstand the effects of a design basis earthquake without loss of capability to perform their safety functions. The function of the ARAVS is to maintain ventilation in the auxiliary and radwaste areas, to permit personnel access, and to control airborne radioactivity in the area during normal operation, during anticipated operational occurrences, and during and after postulated accidents, including loss of offsite power. This requirement is imposed to ensure that (a) in the event of a design basis earthquake, essential portions of the ARAVS will remain functional and (b) the failure of any nonessential portion of the system or of other systems not designed to seismic Category I standards will not result in offsite doses in excess of 5 mSv (0.5 rem) to the whole body or its equivalent to any part of the 47 body. Meeting the requirement of GDC 2 provides assurance that the ARAVS will operate as designed, thus protecting against release of radioactivity in excess of regulatory limits.48 2. Compliance with GDC 5 requires that structures, systems, and components important to safety shall not be shared among nuclear power units unless it can be shown that such sharing will not significantly impair their ability to perform their safety functions, including, in the event of an accident in one unit, an orderly shutdown and cooldown of the remaining units. With regard to the ARAVS, GDC 5 requires that the component parts of the ARAVS be essentially independent in order to ensure that an accident in one unit of a multiple-unit facility will not