Preparation process of fuel element pellets for hospital neutron irradiators
A technology for hospital neutron irradiation and fuel elements, which is applied in nuclear engineering, manufacturing reactors, reactors, etc., can solve the problems of waste products, small size, and low yield, and shorten the process flow
Process, improve the effect of yield
Active Publication Date: 2010-06-02
CHINA NORTH NUCLEAR FUEL
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Problems solved by technology
Reasonable, because the fuel element pellet size of hospital neutron irradiator is very small, it is easy to produce waste products during grinding, the yield rate is low, and it increases
Method used
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[0018] The fuel element pellet preparation process for hospital neutron irradiator of the present invention is further described in detail.
[0023]
[0025] The main purpose of the molding process is to obtain a green body with a certain size, uniform density distribution, and appearance quality that meets the requirements.
[0027] Molding pressure, pressing time and mold size can be designed and selected according to design requirements. The fuel element
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Abstract
The invention provides a pellet preparation process suitable for the design requirements of fuel elements of hospital neutron irradiators. The hospital neutron irradiator fuel element pellet preparation process includes pre-compression granulation, powder molding and pellet sintering processes, wherein, in the pre-compression granulation process, uranium dioxide powder is directly used for pre-compression molding and fork sieving without adding Any additives; when the pellets are sintered and cooled, the sintering chamber is vacuumed and kept at 1200°C to 1300°C for 1 to 2 hours. The present invention also adopts a stepped heating method during the pellet sintering process. The invention satisfies the technical requirement of narrow control range of the pellet density, ensures that the hydrogen content of the pellets after sintering meets the design requirements, and ensures that the small-sized pellets can meet the design requirements without grinding, avoiding the problems caused by grinding. The loss of waste products and nuclear materials improves the yield rate and shortens the process flow of pellet preparation.
Description
Technical field of fuel element pellet preparation technology for hospital neutron irradiator The invention belongs to the technical field of nuclear fuel element manufacturing, specifically a kind of hospital neutron irradiator fuel element pellet Preparation Process. Background technique The neutron irradiation technology of hospital is aimed at conquering current world by the organic combination of nuclear technology and pathology, medicine The last medical problem to be solved urgently - the treatment of malignant glioma. In October 2004, the neutron photo of my country's first hospital The design and construction plan of the injector was officially announced at the Eleventh International BNCT (Boron Neutron Capture Therapy) Conference, making the This technical research ranks among the international level, and it is also the latest research breakthrough in the medical field of our country. Hospital neutron irradiator The nuclear reactor uses low-enriched urani...
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Inventor 王玉岭田春雨李新华邹本慧韩志华聂皓白志勇王玉敏郭显凤房淑英魏东波郝新贵张宇郭繁林
Owner CHINA NORTH NUCLEAR FUEL
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