A Probability Safety Assessment of MACSTOR/KN-400 during The Air Inlet Blockage

Abstract

A framework for assessing the safely of an interim spent fuel storage facility in Korea has been developed and applied in the air inlet blockage accident. It uses the PSA technology to be classified into three phases, which involve first the failure probability assessment phase for a basket and a cylinder. And secondly the possible accident scenarios in the spent fuel dry storage facility are identified. Lastly the accident consequence analysis has been done by the MACCS code. The phase of the analysis includes the quantitative assessment for the failure probability by modeling of the basket and the cylinder, which is the major element of containing radioactive substances. It also evaluates the probability that radioactive substances are released to outside when the initial event happens by applying the construction of the event tree methods. It describes a various heading elements that affect the air inlet blockage accident mitigation. And also using the released radioactive substances, the radiation damage to affect neighborhood and workers, is quantitatively evaluated. It is shown that this framework developed in this study can be applied to assess the synthetic safety for any other dry storage facilities.