Document: NUREG-0800
Document ID: 3263aa5f-b2bf-46fe-b625-e0ffd142404d
Document Type: srp
Title: TURBINE AREA VENTILATION SYSTEM
Source: NUREG-0800
Source URL: https://www.nrc.gov/docs/ML0520/ML052070557.pdf
Revision Date: 2023-06
Chapter: 9
Section ID: 9.4.4
CFR Part: 
CFR Title: 

Content:
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 TAVS, GDC 5 requires that the component parts of the TAVS be essentially independent in order to ensure that an accident in one unit of a multiple-unit facility will not propagate to other units. Therefore the TAVS for each unit should be designed to accommodate the load resulting from accident conditions. At the same time, the operating environment of equipment associated with unaffected units must be maintained within specified limits. Meeting the requirements of GDC 5 provides added assurance that failure or accident in one unit will not affect additional units of a multiple-unit site.50 3. Compliance with GDC 60 requires that provisions be included in the nuclear power unit design to ensure suitable controls on the release of radioactive materials in gaseous effluents during normal reactor operation, including anticipated operational occurrences. The requirements of GDC 60 are applicable to the design of the TAVS because its function is to control the quantities of radioactive materials in gaseous effluents released to the environment from normal ventilation systems. Regulatory Guides 1.140 and 1.52 offer design, testing, and maintenance criteria acceptable to the staff for air filtration and adsorption units of normal ventilation exhaust systems and for engineered safety feature atmospheric cleanup systems in light-water-cooled nuclear power plants. Meeting the requirements of GDC 60 provides added assurance that release of radioactive materials entrained in gaseous effluents will not exceed the limits specified in 10 CFR Part 20 for normal operation and anticipated operational occurrences.51 III. REVIEW