Reactor core of nuclear reactor with fast neutron converting area

Abstract

The invention belongs to a reactor core of nuclear reactor, specifically to a reactor core of nuclear reactor with fast neutron converting area. The reactor core comprises a fast neutron converting area, a basic reactor core area and a reflecting layer area. The fast neutron converting area is positioned at the center of the nuclear reactor; the basic reactor core area is positioned at the periphery of the fast neutron converting area; and the reflecting layer area is positioned at the periphery of the basic reactor core area. The fast neutron converting area comprises a central lattice cell, a second circle of lattice cells and a third circle of lattice cells; the basic reactor core area comprises a fourth circle of lattice cells; and the reflecting layer comprises a fifth circle of lattice cells and a sixth circle of lattice cells. The reactor core is hexagonal; a short fuel subassembly is arranged in the lattice cell of the fast neutron converting area; and a long fuel subassembly is arranged in the lattice cell of the basic reactor core area. The flow speed of the water flow of the short fuel subassembly is high under same pressure difference of the reactor core, thereby being helpful to discharge heat and having higher power density and higher fast neutron fluency rate.

Description

technical field [0001] The invention belongs to a nuclear reactor core, in particular to a nuclear reactor core with a fast neutron conversion zone. technical background [0002] Since nuclear material tests require fast neutron fluence rates, while nuclear fuel tests and isotope production require thermal neutron fluence rates, engineering test nuclear reactors that focus on fuel material tests pursue compact cores and high fast neutron fluence rates. flux rate or thermal neutron flux rate. In addition, it is also necessary to create conditions for carrying out various experimental studies or having a large irradiation space. [0003] The core of the Russian PIK reactor is cylindrical, and the thermal neutron fluence rate is 4.56×10 15 n / (cm 2 s), fast neutron fluence rate 7.2×10 14 n / (cm 2 • s) (En > 0.8 MeV). The fuel is UO with 90% enrichment 2 -Mo-Cu dispersion. The fuel element is a "cross-twisted fuel needle", and the maximum core power density is 6000W / cm ...

AI Technical Summary

Problems solved by technology

[0004] The French JHR stack arranges 90 "cross-twisted fuel needles" in a cell, and there is a hole with a diameter of 32mm in the center, where test pieces are placed, and the fast neutron fluence rate is 10.5×10 14 n / (cm 2 s), the power density in the module is quite high, but the heat transfer capacity of the "cross-twisted fuel needle" is very poor, zirconium or stainless steel is used as the cladding, and the core needs high pressure and high flow rate to export heat

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