A system for plant-wide multi-channel backup of nuclear power plant auxiliaries

Abstract

The article proposes the use of permanent additional low-power steam turbines to back up the auxiliary units of nuclear power plants for removing decay heat from the reactor core. A study was carried out to develop a method of plant-wide multi-channel backup of nuclear power plant auxiliaries based on low-power steam turbines for a multi-unit station. In order to improve the efficiency of plant-wide auxiliary backup for a nuclear power plant having more than two power units, a method for controlled maintenance of the required reactor power at a lack of decay heat was developed based on the use of permanently operating low-power turbines for each power unit. Conditions for the removal of decay heat from one, two, and four reactors, which are demonstrated in the event of the nuclear power plant being disconnected from the power system, are based on the decay heat of one reactor and one low-power steam turbine. The study proved the possibility of creating a multi-channel plant-wide backup of nuclear power plant auxiliaries based on the equipping of each power unit with a low-power steam turbine.