The role of natural circulation level to the inherent safety performance of Pb-Bi or Pb cooled fast reactors

Pb/Pb-Bi cooled fast reactors area among generation IV Nuclear Power Plant which have important feature such as inherent safety capability, ability to burn their own radioactive waste, ability to optimally utilize uranium resources, and economically more competitive. In this paper the important roles of natural circulation level in the primary system to the safety performance especially during unprotected loss of flow (ULOF) accident are discussed. Important results from quasistatic safety analysis as well as full scale accident analysis are presented and discussed.