Development of Accident Event Trees and Evaluation of Safety System Failure Modes for the Nuclear Ultra Large Crude Carrier (ULCC).

摘要

Various ship accidents which have the potential of causing damage to the nuclear power systems of the nuclear powered Ultra Large Crude Carrier (ULCC) are identified. For each ship accident,an event tree is developed which shows the possible causal relationship between ship accident and derangement of nuclear safety-related systems. System state diagrams are developed which define the degree of availability of each safety-related system. As an example of the use of the methodology,availability state tables are derived for each safety-related system for all potential results of a collision accident. Further,an analytic set of probability equations are derived relating the probability of loss-of-function,either partial or complete,of the low pressure safety injection system to the various consequences of a collision.