One Aspect of the Application of Disturbance Analysis to Nuclear Reactor Safety (PWR)

摘要

A possible application of disturbance analysis to the diagnosis of control system failure is presented. A method is developed which permits detailed diagnosis of the disturbance arising from failure of one or more pressurizer pressure sensor channels in a PWR, starting from normal operating conditions. The more difficult problem of analyzing a disturbance in which the pressure sensor channel failures occur during a transient caused previously by some other initiating event is examined only in a preliminary and conceptual way. For the case analyzed in detail, it is found that combinations of failure ranges in all pressure sensor channels can be clustered into groups according to the induced system behavior. The prediction of system behavior corresponding to each failure group is obtained partly by means of qualitative deductive analysis and partly by means of a reactor thermal-hydraulic simulation code. (ERA citation 07:043542)