Active and passive nuclear steam supply system based on 177 core and its nuclear power plant

Abstract

The invention relates to an active and passive nuclear steam supplying system based on 177 reactor core. The nuclear steam supplying system comprises a nuclear reactor core and a reactor coolant system, and is characterized in that the nuclear reactor core comprises 177 nuclear fuel assemblies with the active length of 12-14 feet; and the reactor coolant system comprises a reactor pressure vessel, a main pipe connecting an inlet and an outlet of a reactor coolant, a main pump, a steam generator, a pressure stabilizer and a pressure relief tank. The invention also relates to a nuclear power station employing the above active and passive nuclear steam supplying system based on the 177 reactor core. The power of the assembling unit of the nuclear power station is 1000-1400 MWe, the average availability is more than or equal to 90%, the maximum ground acceleration is 0.3 g, and a containment has a double-layer steel-made structure for resisting bump of large business airplanes. The active and passive nuclear steam supplying system based on the 177 reactor core has the functions of alleviating and preventing severe accidents, and a core measuring meter penetrates into the reactor pressure vessel from top to bottom, so that the active and passive nuclear steam supplying system possesses an active manner and passive manner combined residual heat removal system and a digitalizer control diversity protection system.

Description

technical field [0001] The invention relates to the technical field of third-generation nuclear power, in particular to an active plus passive nuclear steam supply system based on a 177 core and a nuclear power plant thereof. Background technique [0002] Nuclear reactor core design is one of the key design contents of nuclear power plants. Fuel assemblies are an important part of a nuclear reactor core. The main task of nuclear reactor core design is to provide a nuclear reactor core that meets the overall design requirements of PWR nuclear power plants from the perspective of nuclear reactor physics, including determining the number of fuel assemblies and the arrangement of fuel assemblies in the nuclear reactor core. The current 1 million kilowatt-level three-loop pressurized water reactor nuclear power plant reactor core is composed of 157 fuel assemblies, the core power density is relatively high, and the thermal safety margin is relatively low. [0003] In the past, ...

AI Technical Summary

Problems solved by technology

However, software common cause failure (SWCCF) may occur in the main protection system of the reactor based on digitalization, which will lead to the complete failure of the main protection system

If a software common mode failure occurs and a hypothetical expected transient or design basis accident (hereinafter referred to as: software common mode superposition accident) occurs superimposed at the same time, the accident cannot be mitigated and will cause serious consequences

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