| 摘要 |
<p>A control system and method for a nuclear steam supply system for continuously predicting the pending violation of one of the system's design limits. The prediction is made far enough into the future to allow corrective or protective action to be implemented in a timely manner in order to avoid violation of a design limit even on the occurrence of a worst case accident, or, restated, the occurrence of an accident which causes a most rapid approach to the design limit. Various parameters of the nuclear steam supply system are monitored and fed to a calculating mechanism. Samples of these parameters are periodically taken for the periodic detailed calculation of an index representative of the proximity of violation of the appropriate design limit. Continuous readings of these same parameters are taken for the purpose of making continuous updates of the last calculated index. Also, on a continuous basis, continuous readings of the rate of change (slope) of selected parameters are taken and calculations made on the basis of the rate of change of those parameters to obtain a prediction of the parameter a certain time (T) into the future. Modifications to the index are continuously made to the last calculated value of the index to give a prediction of the index (T) seconds into the future. When this predicted index violates a preselected set point, indicating the impending actual violation of a design limit, a signal may be generated to institute protective action which can be accomplished in the T seconds over which the prediction was made.</p> |
