METHOD AND DEVICE FOR CONTROL OF OXYGEN CONCENTRATION IN THE REACTOR PLANT AND NUCLEAR REACTOR PLANT

摘要

The method and system for control of oxygen concentration in the coolant of a reactor plant including a reactor, coolant in the reactor, gas system, mass-exchange apparatus, disperser and an oxygen sensor in the coolant have been disclosed. The method includes the following steps implemented by the system: estimation of the oxygen concentration; comparison of the oxygen concentration with the permissible value; if the oxygen concentration is reduced, comparison of the reduction value and/or rate with the corresponding threshold value; if the reduction value and/or rate of oxygen concentration is below the threshold value, activation of the mass-exchange apparatus; if the reduction value and/or rate of oxygen concentration is above the corresponding threshold value, supply of oxygen-containing gas from the gas system to the near-coolant space and/or activation of the disperser. Technical result: improvement of controllability of oxygen concentration in coolant, enhancement of safety and extension of reactor plant operating life.

主权项

1. A method for control of oxygen concentration in the coolant of a reactor plant including a reactor, a coolant located in the reactor, a gas system with an outlet to the near-coolant space of the reactor, a mass-exchange apparatus installed in the coolant, which contains solid-phase oxides of coolant and is adapted to flowing of the coolant through it, a disperser installed partially in the coolant and partially in the near-coolant space and adapted to supply gas from the near-coolant space to the coolant, and an oxygen sensor in the coolant, the method comprising:
estimating the oxygen concentration in the coolant based on the data received from the oxygen sensor in the coolant; comparing the estimated oxygen concentration in the coolant with the permissible value; estimating the change in oxygen concentration in the coolant; if the estimated change in oxygen concentration in the coolant shows reduction in concentration, comparing the reduction value and/or rate with the corresponding threshold value; if the estimated oxygen concentration in the coolant is below the permissible value and the estimated reduction value and/or rate of oxygen concentration is below the corresponding threshold value, activating the mass-exchange apparatus; if the estimated oxygen concentration in the coolant is below the permissible value and the estimated reduction value and/or rate of oxygen concentration is above the corresponding threshold value, supplying oxygen-containing gas from the gas system to the near-coolant space and/or activate the disperser.