The analysis of the purge system of a steam generator and the system of hydrotests and purging of sensors of control and measuring devices at the Rivne NPP.
Students Name: Ivanov Vadym Borysovych
Qualification Level: magister
Speciality: Heat and Power Engineering
Institute: Institute of Power Engineering and Control Systems
Mode of Study: part
Academic Year: 2022-2023 н.р.
Language of Defence: ukrainian
Abstract: Ivanov V.B., Lys S.S. (head). The analysis of the purge system of a steam generator and the system of hydrotests and purging of sensors of control and measuring devices at the Rivne NPP. Master’s thesis. - Lviv Polytechnic National University, Lviv, 2022. The steam generator purge system is designed to maintain the boiler water quality of steam generators in accordance with the norms of water-chemical regime and for GHG drainage. Boiler water purification is carried out by ion exchange and mechanical method on SVO-5. The system operates in the modes of continuous purge, periodic purge and drainage of GHG. The steam purge system is a system of normal operation, important for safety. The system of hydraulic tests of the primary circuit and purge of KVP sensors is intended for hydraulic tests of the primary circuit and for purging of pulse lines of KVP sensors. The primary circuit hydraulic test and instrumentation purge system is a safety-critical system of normal operation. The system periodically operates in normal operation with the power unit stopped. Purge of instrumentation sensors is carried out if necessary, according to the instructions of the NRC. Purge of pulse lines of KVP sensors is carried out for the purpose of elimination of "contamination" of pulse lines with radioactive products, removal of mechanical impurity and air, filling of equalizing vessels. Hydraulic test of the first circuit for density is carried out after each separation of the RU before its start. In addition, hydraulic testing of RU for strength and density is carried out at least once every four years, after repair or reconstruction of equipment or pipelines with the use of welding, after an earthquake equal to or greater than the design scale. The object of research is GHG purge systems and hydraulic test and purge systems of instrumentation sensors. The subject of research is the modernization of the GHG purge system and the system of hydraulic tests and purge of instrumentation sensors. The purpose and objectives of research. The aim of the work is to analyze the GHG purge system and the system of hydraulic tests and purge of RNPP instrumentation sensors. To achieve this goal it was necessary to perform the following tasks: - to analyze the GHG purge system; - to describe the design and technological scheme of the GHG purge system; - to select the construction materials of the GHG purge system; - to analyze the control and testing during operation of the GHG purge system; - to analyze the systems of hydraulic tests and purge of instrumentation sensors; - to describe the design and technological scheme of hydraulic testing systems and purge of instrumentation sensors; - select structural materials for hydraulic test systems and purge of instrumentation sensors; - to carry out the analysis of control and tests at operation of systems of hydraulic tests and purge of sensors of KVP. In this master’s qualification work, the analysis shows that the GHG purge system meets the requirements: • maintaining the quality of boiler water in the GHG, provided by the capacity of the throttle washers with continuous and periodic purge of GHG; • in all modes of operation of the system the permissible strength characteristics of the equipment provided by the installation of safety valves on purge expanders, heat exchangers, pipelines are not exceeded; • system elements have the ability to test and verify performance. The measures taken to modernize the GHG purge system help to increase its efficiency, efficiency, reliability and safe operation. The analysis allows us to conclude that the system of hydraulic tests of the primary circuit and purge of instrumentation sensors meets the requirements for it - providing the necessary pressure on the purge lines of instrumentation sensors and equipment test lines It is shown that the main way to further increase the economic efficiency of nuclear power plants is to reduce annual production costs by improving the use of nuclear fuel. However, due to the specifics of NPPs, all measures related to changes in the cost of electricity have little effect on the overall efficiency of NPPs. Therefore, for the most effective impact on the thermal power plant, it is necessary, first of all, to take measures aimed at reducing operating costs and component cost. In this master’s thesis a deaerator control system at a nuclear power plant is developed. The deaerator with its work provides reduction of corrosive-active gases in the feed water of the steam-water tract, which allows to increase the service life of structural materials of the core of nuclear reactors. Key words: steam generator purge system, hydraulic test system, instrumentation purge system, high pressure steam pipelines, feed water, power unit.