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A Design Method for Hexagonal Accelerator-Driven Subcritical Reactor Fuel Assembly
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An accelerator-driven and fuel assembly technology, applied in the field of nuclear engineering, can solve the problems of low neutron performance and achieve the effect of improving economic efficiency and neutron multiplication performance
Active Publication Date: 2020-03-20
NAT UNIV OF DEFENSE TECH
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[0005] The invention provides a hexagonal accelerator-driven subcritical reactor fuel assembly and its design method, which are used to overcome the defects of low neutron performance of the fuel assembly in the prior art, and design constraint indicators according to the physical principles of the reactor to determine the accelerator-driven subcriticality. Optimum number of fuel rods for reactor fuel assembly to obtain high technical effect of economy and neutron performance
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Embodiment 1
[0032] The invention provides a method for designing a hexagonal accelerator-driven subcritical reactor fuel assembly, comprising the following steps:
[0033] Step 1, according to the arrangement of fuel rods, the number N of fuel rods is obtained as:
[0034]
[0035] Wherein, n is the number of layers of the fuel rod array;
[0036] For ADS, its core design mostly adopts a triangular arrangement at present, which can make the core structure compact. Thus, its fuel assembly is in the form of a hexagon. In view of the special structural form of the hexagonal fuel assembly, and regardless of external sources and control rods, the number of fuel rods contained in a single hexagonal fuel assembly can be referred to in formula (1).
[0037] Preferably, before said step 1, it also includes:
[0038] In step 10, the fuel rods are arranged in a triangular manner. The layout of the fuel rods inside the fuel assembly is compact, and the overall volume and weight of the fuel ass...
Embodiment 2
[0067] Please refer to figure 1 , figure 2 , the invention provides a hexagonal accelerator-driven subcritical reactor fuel assembly, comprising:
[0068] The base 100 is hexagonal, and several base units for installing the fuel rods 4 are arranged on the top surface; the size and shape of the base units are the same, one of the base units is located at the center P of the base, and the rest of the bases are The units are in a circular array around the base unit located in the center of the base, and the distances between adjacent base units are equal;
[0069] The housing 200 includes a hexagonal prism sleeve, the cross section of which is adapted to the shape of the base 100, and the bottom is installed on the base;
[0070] The inner sleeve (component wall area 2), including a hexagonal column sleeve, is located in the outer shell 200 and has a gap (component gap area 3) with the outer shell 200, and the bottom of the inner sleeve is also installed on the outer shell 200...
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Abstract
A hexagon accelerator driven subcritical reactor fuel assembly and a design method thereof are disclosed. The assembly includes a hexagon base the top surface of which is provided with a plurality ofbase units for fuel rod mounting, with one of the base units being at the center of the base, other base units surrounding the center base unit and being arranged in an annular array manner, distancesbetween adjacent base units being equal; a shell including a prismatic sleeve the cross section of which adapts to the shape of the base and the bottom of which is mounted on the base; an inner sleeve including a prismatic sleeve, disposed inside the shell with a gap between the inner sleeve and the shell, with the bottom of the inner sleeve being mounted on the base; and a plurality of fuel rods, wherein each fuel rod includes a cylindric casing and a core rod in the casing and made of fuel, the bottom of each casing is mounted in one base unit, and the number of the fuel rods is equal to the number of the base units. The assembly and the method are used for solving a problem that neutron performance is poor, and technical effects that economic performance and neutron performance are high are achieved.
Description
technical field [0001] The invention relates to the technical field of nuclear engineering, in particular to a hexagonal accelerator-driven subcritical reactor fuel assembly and a design method thereof. Background technique [0002] With the rapid growth of my country's economy, the demand for energy, especially the demand for nuclear energy, has increased sharply, which has led to the rapid growth of the installed capacity of pressurized water reactornuclear power plants in my country, and the accumulation of nuclear waste has increased rapidly. The problem of nuclear waste disposal, especially in spent fuel The handling of minor actinides has always been a worldwide problem. In order to solve this problem, an advanced closed fuel cycle, that is, the separation-transmutation (PT) strategy has been proposed internationally. Among them, the Accelerator Driven Sub-critical System (ADS) is an ideal device for transmuting nuclear waste and producing energy. , with good resource ...
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