System and method for starting and stopping a reactor

Abstract

The invention provides a system and method for starting and stopping a sodium-cooled reactor. The input ends of each steam-water pipe network of the system are connected to multiple steam generators, and the output ends are connected to expansion vessels. Each steam-water pipe network is equipped with a parallel The pressure-reducing regulating valve group and the steam pressure-reducing valve group, the expander are respectively connected with the high-pressure auxiliary steam header, condenser and deaerator; The hot water output by the steam generator is discharged into the expansion vessel through the pressure-reducing regulating valve group; the expansion vessel separates the water and steam, the steam is discharged into the high-pressure auxiliary steam header, and the water is discharged into the condenser or deaerator; the steam pressure reducing valve The group is used to open when the steam is in the process of starting and stopping, so that the steam output by the steam generator is discharged into the expansion vessel and then discharged into the high-pressure auxiliary steam header. The invention can maintain the pressure under the water / steam working condition during the start-up and stop of the reactor, and the requirement of flow change, and is very suitable for the reactor of a large unit.

Description

technical field [0001] The invention belongs to the technical field of nuclear reactors, in particular to a reactor start-stop system and a reactor start-stop method. Background technique [0002] bombardment with fast neutrons 235 U and 239 The reactor built by Pu can achieve a breeding ratio greater than 1, that is, the nuclear fuel produced is more than the nuclear fuel consumed. This kind of reactor is called a "fast neutron reactor". The sodium-cooled fast reactor is a fast neutron reactor with liquid sodium as the coolant. It is the most mature and most experienced reactor type among the fourth generation reactors. The main heat transfer system of the sodium-cooled fast reactor adopts a sodium-sodium-water three-circuit design form. Different from pressurized water reactor nuclear power plants, fast reactors use once-through steam generators, and a start-up and shutdown cooling system (hereinafter referred to as start-stop system) is required to ensure the normal st...

AI Technical Summary

Problems solved by technology

[0003] However, the current start-stop system is generally only used in nuclear reactors with relatively small generator power and relatively simple structure.

However, for nanocooled reactors containing multiple sets of steam generators, there is no mature solution for how to isolate the faulty modules, maintain the pressure under water / steam conditions, and the requirements for flow changes during start-up. Therefore, it is urgent to design a Start-stop system suitable for large units and high-power reactors

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