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Water squeeze rod assembly driven by driving mechanism in pressure shell and water stack using the assembly

A driving mechanism and water-squeezing rod technology, which is applied in the field of nuclear reactor engineering technology, to achieve the effects of reducing fuel cycle costs, improving conversion ratio, and saving uranium resources

Inactive Publication Date: 2011-11-30
张育曼 +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Judging from this incident, for the current pressurized water reactor that adjusts the concentration of boric acid in water to compensate for reactivity, it is very risky to install a large number of water-squeezing rod drive mechanisms outside the pressure shell head to implement "spectrum shift control"

Method used

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  • Water squeeze rod assembly driven by driving mechanism in pressure shell and water stack using the assembly
  • Water squeeze rod assembly driven by driving mechanism in pressure shell and water stack using the assembly
  • Water squeeze rod assembly driven by driving mechanism in pressure shell and water stack using the assembly

Examples

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Effect test

Embodiment 1

[0037] In the pressure shell of a 1000Mwe pressurized water reactor, water-squeezing rod bundles with zirconium alloy cladding on the outside and depleted uranium dioxide core inside are installed in the hexagonal bundle fuel assembly of the core and on the six corner points And the cross-section is Y-shaped water squeezing rods, which are respectively connected to the dynamic cylinder of the built-in hydraulic drive mechanism in the pressure shell, and the static cylinder is fixed on the guide tube support plate, and the depleted uranium dioxide is squeezed out of the water rod at the beginning of the fuel cycle Insert the fuel assembly into the core, and extract it step by step during the burnup process. By changing the average water-uranium ratio of the core, the reactivity spectrum shift control of the reactor can be realized, thereby greatly reducing the boron concentration in the primary circuit water of the PWR during operation. (It is only necessary to increase the conc...

Embodiment 2

[0042]In the pressure shell of a 1000Mwe pressurized water reactor that has been in operation, a cross-shaped water squeeze rod assembly driven by a hydraulic drive mechanism is installed at the four corners of the core square rod bundle fuel assembly. The water squeeze rod is composed of zirconium cladding and its inner Composed of depleted uranium dioxide core body, the reactivity spectrum shift control of the reactor is realized, and at the same time, the original solid control rod assembly and its electromagnetic drive mechanism are retained. The core is composed of 157 square fuel assemblies of 21.45cm×21.45cm, with a grid pitch of 1.26cm, 289 (17×17) rod positions, and fuel assemblies with control rods, including 264 fuel rods, 1 measuring tube, and 24 Each of the Zr-4 control rod conduits occupies the position of one fuel rod, and the cross-section is set at the four corners of the fuel assembly as a cross-shaped water squeeze rod assembly. The thickness of the water squ...

Embodiment 3

[0045] In a supercritical water nuclear reactor with a net electric power of 100Mwe (thermal power of 250Mwt) using sleeved fuel assemblies (the structure of a supercritical water nuclear reactor using sleeved fuel assemblies can be found in Chinese Patent 200510055365.5), a low-carbon ferrite pressure vessel with an inner diameter of 245cm The inner wall is surfacing with stainless steel cladding, the wall thickness is 20.0cm, it can withstand the design pressure of 27.5Mpa, the operating pressure of supercritical water is 25Mpa, the equivalent diameter of the active area of ​​the core is 133cm, and the core has 19 casing fuel assemblies arranged in a triangle , the structure of the casing fuel assembly is as follows Figure 9 As shown, it includes a coaxial Zr-2.5% Nb outer casing 21, an alloy material (stainless steel, nickel-based alloy or aluminum-based niobium-containing alloy and other materials) middle casing 22 and center tube 23, the outer radius of the outer casing i...

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Abstract

The invention belongs to the field of nuclear reactor engineering, in particular to a follower component driven by a driving mechanism in a pressure shell and a water reactor adopting the same. The invention realizes the spectral shift control of a reactor and compansates the decrease of reactivity in a burn-up process by a depleted uranium (or thorium) compound follower, and adopts a dense weir and residential uranium compound fuel postprocessed by partially utilizing natural uranium and spent fuel, thereby greatly saving nuclear fuel and decreasing fuel cycle cost. A driving mechanisms driving a great amount of follower components are arranged in the pressure shell, so as to prevent the joint sections of the driving mechanism from penetrating through the upper sealing head of the pressure shell, carry out the spectral shift control under the condition without influencing the reliability of the pressure shell, lower the boron concentration of the water reactor in water in an operation process, avoid the occurrence of the problem of serious corrosion of the joint sections and the upper sealing head of the driving mechanism due to the penetration of boric acid through the upper sealing head of the pressure shell, reduce the possibility of elastic rod accidents and improve the safety.

Description

technical field [0001] The invention belongs to the technical field of nuclear reactor engineering, in particular to a water squeeze rod assembly driven by a drive mechanism in a pressure vessel and a water reactor using the water squeeze rod assembly. The "spectrum shift control" of the reactor is realized by using the water squeeze rod assembly, and The use of "dense water fence" and partial use of natural uranium and residual uranium compound fuel after spent fuel reprocessing can greatly save nuclear fuel, reduce fuel cycle costs, and improve safety. Background technique [0002] "Spectrum shift control" is a method to adjust and control the reactivity of the reactor. When used to compensate for the decrease in reactivity caused by burnup, it is obviously superior to the three methods of adjusting the concentration of boric acid in water, neutron absorber control rods and combustible poisons. , which can save a lot of nuclear fuel consumption in nuclear power plants and ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G21C7/27G21C1/00
CPCY02E30/31Y02E30/32Y02E30/39Y02E30/30
Inventor 张育曼李玉崙赵翊民
Owner 张育曼
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