Resolution of Generic Safety Issues: Item C-2: Study of Containment Depressurization by Inadvertent Spray Operation to Determine Adequacy of Containment External Design Pressure ( NUREG-0933, Main Report with Supplements 1–34 )
Inadvertent operation of containment sprays can result in a rapid depressurization of the containment building. Where containment external design pressure may be exceeded, many plants have been provided with vacuum breakers or control system interlocks to prevent the containment external design pressure from being exceeded. The depressurization of the containment is a transient behavior and can take place in a short time period. This NUREG-04713 task involves the development of a code to be used for the analysis of containment pressure response (both with and without the effects of vacuum breakers or control systems) for the inadvertent spray accident.
Licensees are required to perform analyses of containment depressurization due to inadvertent spray operation.412 These analyses are reviewed by the NRC in accordance with SRP11 Section 22.214.171.124. Thus, this item has been RESOLVED.