| 摘要 |
A protection and control system for a nuclear reactor which monitors a variable operating parameter indicative of the state of reactor operation and identifies an abnormal rate of change in reactor operating conditions. The operating parameter monitored at a given time after the abnormal change in operating conditions is identified and is employed as a base for a variable setpoint defining a design limit within which the reactor can continue to operate. At a preselected time following the identification of the abnormal rate of change of the reactor operating conditions, control of the reactor is automatically modified to establish a reactor working environment in which the reactor can continue to operate. Should the established setpoint be exceeded, the reactor will automatically be tripped. In one embodiment the negative rate of change of neutron flux of the nuclear core is monitored and compared to a preselected reference. If the reference is exceeded, following a preestablished time interval the flux monitored within the reactor core will be stored and employed as a base for the setpoint design limit below which reactor operation may continue. At the same time, control rod withdrawal from the core is blocked and load requirements are reduced compatible with the new operating level of the core. Should core power subsequently increase above its flux setpoint limit the reactor will automatically be tripped.
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