Automatic motion inhibit system for a nuclear power generating s

Details Automatic motion inhibit system for a nuclear power generating s Automatic motion inhibit system for a nuclear power generating s

1975-08-18

1977-10-25

Pendegrass, Verlin R.

176 20R, G21C 700

Patent

active

040554635

ABSTRACT:
An automatic motion inhibit system for a nuclear power generating system for inhibiting automatic motion of the control elements to change the reactor power in response to turbine load changes. A final reactor power level setpoint is continuously compared with reactor power and a setpoint-greater-than-power signal is generated when the final reactor power level setpoint is greater than the reactor power. The final reactor power level setpoint is a setpoint within the capacity of a steam relief valve system which in no event is lower in value than the lower limit of automatic operation of the automatic motion control means. Also the reactor power demand or turbine load is continuously compared with a predetermined power demand threshold and a demand-less-than-threshold signal is generated when the reactor power demand is less than the demand threshold. Then if both the setpoint-greater-than-power and demand-less-than-threshold signals are present an inhibit signal is generated which inhibits the automatic motion control means from responding to turbine load changes. Also an automatic lock-in system is disclosed for preventing premature termination of the inhibit signal as the turbine load is increased above the predetermined demand threshold.

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