Reactor Cavity Cooling System (RCCS) having passive safety features

Takamatsu, Kuniyoshi  ; Matsumoto, Tatsuya*; Morita, Koji*

After the accident at the Fukushima NPPs, measures to prevent core damage in terms of defense in depth had become more and more important. Researches regarding cooling system having novel safety features are crucially essential subjects. Therefore, a new Reactor Cavity Cooling System (RCCS) having passive safety features is proposed. The RCCS does not require active cooling systems and never lost heat sink in the same way as the accident at the Fukushima NPPs. The RCCS can become a base load cooling system like a base load power station and remove a part of emissive heat in rated operation and a part of decay heat after reactor shutdown, constantly, stably and passively.