Nuclear power plant secondary loop flushing device and flushing method

Abstract

The invention discloses a flushing device and flushing method for a secondary loop of a nuclear power station. The flushing device comprises a water condensation system, a low-pressure water supply system and a high-pressure water supply system that are communicated successively. The water condensation system, the low-pressure water supply system and the high-pressure water supply system are respectively provided with temporary pipelines led to a catch basin arranged outside a plant; and valves are arranged at the temporary pipelines. Compared with the prior art, the flushing device and flushing method have the following beneficial effects: because the temporary pipelines and the valves are arranged to carry out open type mass-flow flushing, foreign matters left in the pipelines and equipment at the engineering building stage are driven by the large water flow to be flushed to all container holes and filter nets of the equipment, so that the foreign matters are cleaned before startingof a set and are prevented from entering a nuclear island vapor generator and thus the set works safely after being started. The flushing construction period is shortened substantially; and the energy-saving and economic effects are obvious.

Description

technical field [0001] The invention belongs to the field of nuclear power engineering construction and debugging, and more specifically, the invention relates to a nuclear power plant secondary circuit flushing device and a flushing method thereof. Background technique [0002] The secondary circuit of the pressurized water reactor nuclear power plant mainly includes condensate extraction system (CEX), low-pressure feedwater heater system (ABP), feedwater deaerator system (ADG), start-up feedwater system (APD), electric main feedwater pump system (APA), High pressure feed water heater system (AHP), feed water flow control system (ARE), feed water heater drainage recovery system (ACO), circulating water system (CRF), auxiliary cooling water system (SEN), conventional island closed cooling water system ( SRI), conventional island desalinated water distribution system (SER) and other systems, in the project construction stage, due to factors such as many systems, large enginee...

AI Technical Summary

Problems solved by technology

The design of the drainage pipelines of each system is designed according to the isolation and maintenance of the system. The diameter of the drainage pipelines is small and the drainage speed is slow; The net will also be often blocked, and the cleaning of the filter needs to be isolated and drained, making the flushing time very long

Moreover, the existing solutions cannot solve the problem of foreign matter that may be brought into the system during the construction stage, which brings hidden dangers to the safe operation of the unit

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