SU439227A1 - NUCLEAR POWER REACTOR POWER REGULATOR - Google Patents

Description

one

This invention relates to automatic regulators of nuclear power reactors.

Multichannel power regulators for a water-cooled power reactor are known, including a control unit, a second circuit pressure sensor, a measuring unit, a relay unit, a podromic feedback device, a period meter, and an actuator.

The regulator provides satisfactory quality of transients in the automatic regulator system at instantaneous load shedding by the power unit turbogenerators and at load sets at a constant speed.

However, in some situations, the reactor power increases too quickly. In this case, the emergency protection of the reactor is triggered.

In order to limit the rate of increase in reactor power in the proposed controller, a switch is connected between the output relay unit and the actuator, the control input of which is connected to the output of the threshold device.

By setting the threshold device, blocking the signal “More regulator until the dangerous periods of reactor acceleration is reached, than the emergency protection is prevented.

The drawing shows a block diagram of the proposed controller.

The regulator contains a setting device 1, a pressure sensor 2, a measuring unit 3, a relay unit 4, an isodromic feedback device 5, a control key 6, an actuator 7, a neutron flux sensor 8 in the reactor, a logarithm unit 9, a differentiating unit 10, a threshold device 11, additional controlled key 12.

If the pressure in the second circuit deviates from the setpoint by an amount exceeding the dead zone of the relay

block 4, at the output of "More or" less

relay unit 4 appears to control

signal. This signal is fed to the control input of the keys 6, translating them into a closed state, allowing the charge of the isodromic feedback 5 in the channels with activated relay blocks 4, as well as to the actuator 7, which causes a change

power (neutron flux) of the reactor and the change in the controlled parameter — pressure in the secondary circuit.

To increase reactor power and achieve a relative rate of change

neutron flux - the setpoint level of the threshold device 11 is last triggered, -.transfering additional control key 12 to the open state. Accordingly, the regulator movement is stopped, the neutron flux increase rate is reduced, the threshold device 11 is reset, permitting a further increase in the power of the regulator. The control process is terminated when a predetermined pressure value is reached.

To reduce the reactor power, the rate of change of the neutron flux does not affect the operation of the regulator.

Subject invention

The power regulator of a nuclear power reactor, comprising a pressure control channel in a circulation loop with an output relay unit, a measurement channel for an increase in reactor power with a threshold device and an actuator, characterized in that, in order to limit the rate of increase in reactor power, between the output relay unit and the actuator includes a key, the control input of which is connected to the output of the threshold device.

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