Control system for boiling-water reactor

Details Control system for boiling-water reactor Control system for boiling-water reactor

1975-07-11

1978-08-22

Bentley, Stephen C.

176 24, 176 54, G21C 700

Patent

active

041087208

ABSTRACT:
A plurality of local power range monitors are provided in the core of a nuclear reactor and the total output of the reactor is obtained from the outputs of the monitors. The output of the reactor, if it reached its equilibrium state, will normally keep a constant value, but after the load is changed, the output is also varied by the influence of the neutron absorbing property of the fission products generated as a result of the load change, and especially after the reactor output has been increased, it is spontaneously increased over its setting value to cause the reactor to overheat. The minimum allowable recirculating flow which prevents the overheat at a given total output, is obtained on the basis of the total output. If the actual recirculating flow is larger than the minimum allowable flow, the recirculating flow is freely controlled, but if the actual flow is smaller than the minimum value, the control of the recirculating flow is prohibited and the control rods are inserted for the control of the reactor output. The insertion begins with one of the control rods near the local power range monitor whose output is the maximum.

REFERENCES:
patent: 3042600 (1962-07-01), Brooks
patent: 3197376 (1965-07-01), Bulent et al.
patent: 3202804 (1965-08-01), Schlein
patent: 3551289 (1970-12-01), Eich et al.
patent: 3565760 (1971-02-01), Parkos et al.
patent: 3630839 (1971-12-01), Podolsky
patent: 3671390 (1972-06-01), Hogle
patent: 3778347 (1973-12-01), Giras et al.
patent: 3931500 (1976-01-01), Berkebile et al.
Nuclear Engineering International, (1/75), pp. 43-47.

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