Method of operating a nuclear reactor
Method of controlling nuclear power plant
Power controlling apparatus for boiling water atomic reactor
Operating method for nuclear power plants Patent #: 4605530
ApplicationNo. 935655 filed on 08/26/1992
US Classes:376/210, By coolant flow376/216, Plural sensed different conditions or measured variables correlated376/217Control programs
ExaminersPrimary: Walsh, Donald P.
Assistant: Voss, Frederick H.
Attorney, Agent or Firm
International ClassG21C 007/32
Foreign Application Priority Data1989-07-14 JP
AbstractDecreasing the speed of a pump supplying cooling water to the core in the boiling water type nuclear reactor based on a trip signal that is generated when a pump supplying feed water is tripped. This performs a first operation to decrease the nuclear reactor power to a first fixed value. A second operation lowers the nuclear reactor power to a second fixed value that is lower than the first fixed value and that prevents run-out of other first pumps in operation. The first fixed value is lower than the reactor power at the moment when the first pump is tripped. The steam flow is decreased substantially simultaneously with the decrease of the feed water flow. Thereby, the decrease of the steam flow is carried out in an early stage when the feed water pump is tripped and the possibility of nuclear reactor scram is reduced.