Gas exhaustion system of reactor container

In a BWR type reactor, a connection pipe is disposed from a dry well and a wet well to a main steam pipeline, and a reactor container isolation valve is disposed to the pipeline. Excess pressure in the reactor container is released to a turbine condensator, to condensate steams in the condensator and remove water soluble radioactive materials. In addition, radioactive materials are reduced due to decay by temporarily storage in the turbine condensator. Radioactive materials in an incondensible gas are sufficiently removed by a gaseous waste processing system and the gas is released to the atmosphere through a main exhaustion tower. Pressure in the container is reduced by releasing the excess pressure to the turbine condensator, which prevents failure due to excessive pressure. (N.H.)