Outboard heat exchanger passive heat removal system from the reactor plant

Abstract

After the accident at the Fukushima-1 NPP, the requirements for the safety of reactor facilities became more stringent, which led to the improvement of safety systems due to the transition from active principles of operation to safety systems with passive principles. An example of such a system is a passive heat removal system (hereinafter PHRS), which should transfer heat from the core of a nuclear steam generating unit to the final absorbers (sea water and/or atmospheric air) during normal and emergency cooling down, as well as when operating at low power static modes. without the participation of a steam turbine unit. Moreover, the process of heat removal should be carried out without using additional energy sources. This means that the PHRS must convert part of the removed heat energy into work on moving the coolant in it. Without the cost of electricity, this process can be carried out using natural circulation (EC) and/or steam-water jet devices (PVSA).