METHOD FOR CONTINUOUS MONITORING OF THE LEAKAGE IN THE STEAM GENERATOR OF THE WATER-WATER REACTOR AND DEVICE FOR ITS IMPLEMENTATION

摘要

1. Method for continuous monitoring of leakage in the steam generator of a pressurized water reactor, including measuring the activity of gaseous radionuclides in the second circuit, characterized in that, in order to increase the sensitivity and representativeness of the control by isolating and accumulating inert radioactive gases, the water sample of the secondary coolant is mixed with air , then degassed, and the released air is again used for mixing with the coolant, by organizing recirculation along the air circuit, which is produced from measurements, while the flow rate of the water sample is chosen from the condition: where G is the flow rate of the water sample of the coolant, l / h, V is the volume of the air circuit, including the measurement section, l, λ is the decay constant of the shortest radionuclide from the IGH, ρ - the volume fraction of air remaining in the coolant sample after its degassing. The method according to claim 1, characterized in that, in order to improve the accuracy of control by stabilizing the volume of the air circuit, degassing is performed at a constant pressure. The method according to claim 1, characterized in that, in order to improve the control accuracy by stabilizing the efficiency of degassing, the ratio of the air flow in the recirculation circuit to the flow rate of the coolant sample is kept constant. The method according to claim 1, characterized in that, in order to increase the representativeness of the control by determining the activity of radionuclide N-16, the total gas activity is measured in an aqueous coolant sample, and the contribution from inert radioactive gases is taken into account using a measurement made in the air recirculation circuit , while S = S =, where S is the sensor reading from the N-16 radionuclide, and / s; S- sensor reading from the total gas activity, a / s; S- sensor reading in the recirculation loop, and / s; K - coefficient accumulation of IRG in the recirculation box ur, 5. Device for continuous monitoring of leakage in the steam generator of a pressurized water reactor, containing a measuring section with an ionizing radiation detector, characterized in that, in order to increase the sensitivity and representativeness of the control, a recirculation air circuit with a water-to-air ejector and degasser to which it is connected is introduced into it the measuring section, with the outlet of the ejector connected to the inlet to the degasser, and the connection for the air injected into the ejector through the measuring section with the output of ear chamber degasser, degasser and the air chamber communicates with the atmosphere.