The dependence of pressure and water level in a nuclear steam generation unit type "BETA" from load
In the steam generation unit type "Beta" the circulation of the primary coolant is provided by jet devices. However, the interaction of the jet devices with the boiling core has its own characteristics. One of them is the reduction of pressure in the pressurizer in the part-load operations of the unit. The change in pressure in the primary circuit affect the operation of the steam generators, and also causes a redistribution of the primary coolant between the water and vapor phases and a change in the level in the pressurizer. The change in the water level in the pressurizer significantly affects the operation of the separators and the start of the jet devices. In the present work, the results of a theoretical calculation of the influence of the geometric parameters of an integral reactor and the thermophysical parameters of the primary coolant at nominal power on the change in pressure and water level on part-load operations of the unit are presented. An example is given that illustrates the physical meaning of the effect of changing the ratio of the water and vapor phases of the primary coolant under the nominal power to the level change in the pressurizer under fractional loads.