Using mechanical control rods as the core of the second shutdown system

Abstract

Belonging to the technical field of nuclear reactor design, the invention specifically relates to a core using machinery control rods as a second reactor shutdown system. The core comprises fuel assemblies, first control rods, second control rods and beryllium assemblies. The plurality of fuel assemblies are in annular compact arrangement; the plurality of first control rods are arranged among the fuel assemblies at intervals; two second control rods are horizontally arranged close to the external side of the annular area of the fuel assemblies; two second control rods in 45 DEG opposite angles to a horizontal direction are arranged close to the internal side of the annular area of the fuel assemblies; and the plurality of hexagon beryllium assemblies are arranged among the above composition parts to form a complete circular core. According to the core using the machinery control rods as the second reactor shutdown system provided by the invention, when the first control rods are stuck at a critical rod position and can not realize reactor shutdown motion, the second control rods can realize rapid reactor shutdown and maintain long-term cold shutdown, so as to guarantee security of the core.

Description

technical field [0001] The invention belongs to the technical field of nuclear reactor design, and in particular relates to a reactor core using mechanical control rods as a second shutdown system. Background technique [0002] Reactor-related safety regulations require that the shutdown means must consist of two different systems. The second shutdown system is a defense-in-depth means to prevent failure of the reactor protection system shutdown. At least one of the two systems can independently perform the function of bringing the reactor from operating conditions and accident conditions to subcriticality with sufficient depth rapidly under single failure conditions. Even with the maximum back-up reactivity of the core, at least one of the two systems can independently bring the reactor into subcriticality from normal operating conditions and maintain the subcriticality with sufficient depth and high reliability. [0003] The core needs to be equipped with a second shutdo...

AI Technical Summary

Problems solved by technology

However, when an ATWS accident occurs, or even due to possible misuse, once the boric acid solution is injected into the core, the entire reactor, including the fuel assemblies in the core, is in danger of being completely scrapped

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