RECIRCULATING FLOW RATE CONTROL DEVICE

PURPOSE:To make stable reactor operation with high reliability by automatically averting respectively specific hunting phenomena at the time of parallel operation of two systems of MG set which control the recirculating flow of a coolant. CONSTITUTION:The respective hunting regions possessed by two systems of the MG sets with respect to the speed signals of the MGs inputted from a main controller 3 are detected by a comparing means 12 of an unbalance operating device 11. The positive or negative biases for averting hunting are outputted to respective speed controllers 5a, 5b and further, the operations of the speed controllers 5a, 5b and bias setters 13a, 13b are selected to apply the biases to the outputs of the respective speed controllers 5a, 5b, by which the hunting regions possessed by the respective MG sets are averted and the fluctuations in the recirculating flow are eliminated. The reactor is, therefore, operated stably with the high reliability.