System for determining power generated by a nuclear core assembly

A method for determining a power generated by an assembly for a nuclear reactor, using a system comprising:

• a subsystem for measuring a flow rate of the heat-transfer fluid, including
• a body comprising at least one inlet, at least one outlet, and at least one passage for a flow of the heat-transfer fluid from the at least one inlet to the at least one outlet, the at least one passage extending from the at least one inlet to the at least one outlet in a longitudinal direction,
• at least one rotor disposed inside the at least one passage and configured to be rotated, by the flow of the heat-transfer fluid, about an axis substantially parallel to a flow direction of the heat-transfer fluid in the at least one passage, the flow direction of the heat-transfer fluid in the at least one passage being parallel to the longitudinal direction of the at least one passage, and
• a device for measuring a rotation speed of the at least one rotor, wherein the device for measuring the rotation speed of the at least one rotor comprises
• an emission module for emitting an incident light radiation having a wavelength greater than 1200 nm,
• an optical module configured to
• transmit the incident light radiation from the emission module on blades of the at least one rotor, such that the incident light radiation is incident on the blades of the at least one rotor in a direction substantially perpendicular to the axis of a rotation of the at least one rotor, and
• receive a reflected light radiation, the reflected light radiation coming from a reflection, on the blades of the at least one rotor, of the incident light radiation, and
• a first conversion module configured to determine the rotation speed of the at least one rotor according to the reflected light radiation and determine the flow rate of the heat-transfer fluid according to the rotation speed of the at least one rotor, and
• the system further comprises
• a subsystem for measuring a temperature of the heat-transfer fluid at the at least one inlet of the assembly and a temperature of the heat-transfer fluid at the at least one outlet of the assembly, and
• a second conversion module configured to determine a power generated by the assembly according to at least the flow rate of the heat-transfer fluid determined by the first conversion module and a difference between the temperature of the heat-transfer fluid at the at least one inlet of the assembly and the temperature of the heat-transfer fluid at the at least one outlet of the assembly,
• the method comprising:
• measuring the flow rate of the heat-transfer fluid comprising at least
• emitting, by the emission module, the incident light radiation having the wavelength greater than 1200 nm,
• transmitting, by the optical module, the incident light radiation from the emission module on the blades of the at least one rotor, such that the incident light radiation is incident on the blades of the at least one rotor in the direction substantially perpendicular to the axis of rotation of the at least one rotor,
• reflecting the incident light radiation on the blades of the at least one rotor,
• receiving, by the optical module, the reflected light radiation,
• converting, by the first conversion module, the reflected light radiation to determine the rotation speed of the at least one rotor, and
• determining the flow rate of the heat-transfer fluid according to the rotation speed of the at least one rotor,
• measuring the temperature of the heat-transfer fluid at the at least one inlet of the assembly and the temperature of the heat-transfer fluid at the at least one outlet of the assembly, and
• converting into power generated by the assembly from at least the flow rate of the heat-transfer fluid, and the difference between the temperature of the heat-transfer fluid at the at least one inlet of the assembly and the temperature of the heat-transfer fluid at the at least one outlet of the assembly.