A new-type passive decay heat exchanger has been put forward for the requirements of largetype size fast reactor,which can make little flux passing through the exchanger under normal condition and the exchanger inlet be opened passively to remove the core residual heat energy under accident condition.The structure and principle diagram of the heat exchanger is showed in A new-type passive decay heat exchanger has been put forward for the requirements of large type size fast reactor, which can make little flux passing through the exchanger under normal condition and the exchanger inlet be opened passively to remove the core residual heat energy under accident condition The structure and principle diagram of the heat exchanger is showed in