What are V1 and V2? How they are connected? What is the harm in opening F/M vault door during reactor operation?

What are V1 and V2? How they are connected? What is the harm in opening F/M vault door during reactor operation? 
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1 Answer

Answer :

The reactor building is divided into two areas. They are V1 and V2.

V1 – Dry volume area.

V2 – Wet volume area.

V1 area includes F/M vault, boiler room, and entire dome area. Rest of the areas in the reactor building is V2 area. V1 and V2 are connected by vent shaft through

suppression pool.

F/M vault is a V1 area and F/M maintenance bay is a V2 area. Usually when there is an accident in F/M vault the pressure is relieved through boiler room through suppression pool and the uncondensed gases to V2 area. When the reactor is in operation and if we open the F/M vault door, suppose of there is an accident in F/M vault the pressure released directly goes to F/M maintenance area, which is a V2 area. Thus pressurizing the entire building. 


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