Nuclear fuel pellet and its manufacturing method
A manufacturing method and fuel area technology, applied in the direction of processing and manufacturing, fuel elements, manufacturing reactors, etc.
Active Publication Date: 2019-12-31
X ENERGY LLC
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- Application Information
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Problems solved by technology
Moreover, the negative temperature feedback reactivity properties of HTGR fuel lead to the automatic shutdown of the nuclear fission chain reaction when the temperature exceeds a safe level
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[0020] Various embodiments will be described in detail with reference to the accompanying drawings. Wherever possible, the same reference numbers will be used throughout the drawings to refer to the same or like parts. Reference to specific examples and implementations is for illustrative purposes, and is not intended to limit the scope of the invention or the claims.
[0021] Various embodiments provide methods of mass-producing fuel elements for use in high temperature gas-cooled reactor (HTGR) cores that achieve higher productivity, lower cost, and higher levels of production than are available in conventional manufacturing methods quality. Example methods include: forming fuel elements (eg, fuel pellets) using additive manufacturing methods, such as three-dimensional (3D) printing methods; and precisely placing particles of fuel, combustible poisons, and / or breeding materials on the fuel of the fuel element structure area.
[0022] Particles placed in the fuel region of...
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Abstract
A method of manufacturing a nuclear fuel element may comprise: forming a graphite substrate of the fuel element; depositing a first graphite and / or graphite sphere layer on the substrate portion; depositing a first graphite and / or graphite sphere layer on the first graphite and / or graphite sphere layer First fuel, combustible poison and / or multiplication particle layer; Form second graphite and / or graphite ball layer on described first particle layer; Deposit second fuel, on described second graphite and / or graphite ball layer, a layer of burnable poison and / or breeding particles; and a portion of the graphite cap forming said fuel element. Adjacent fuel, burnable poisons, and / or breeding particles of the first layer are separated by substantially the same distance, and adjacent fuels, burnable poisons, and / or breeding particles of the second layer are separated by substantially the same distance. The fuel elements may be spherical fuel pellets. The fuel particles may be triple-structured isotropic particles without an outer coating.
Description
Background technique [0001] High temperature gas-cooled reactors (HTGRs) hold great expectations for the efficient and inherently safe production of electrical power. HTGR designs typically feature fuel sequestered within a layer of graphitic moderators, and along with multiple physical barriers are constructed to minimize the potential for fission product release. Moreover, the negative temperature feedback reactivity characteristic of HTGR fuel results in an automatic shutdown of the nuclear fission chain reaction when the temperature exceeds a safe level. These inherent properties of HTGR enable the design of an inherently safe reactor that relies on minimal emergency core cooling systems. [0002] One type of HTGR is called a "pebble bed" reactor. In this HTGR design, the fissionable fuel is encapsulated within multilayer ceramic particles, which themselves are encapsulated within multilayer graphite spheres (referred to as "pellets"). The spherical nature of the fuel p...
Claims
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IPC IPC(8): G21C3/62G21C3/42G21C3/58
CPCG21C1/07B29C64/165G21C3/42G21C3/58G21C3/28G21C21/14B33Y80/00G21C3/62Y02E30/30G21C21/02B33Y10/00
Inventor P·帕帕诺M·P·范·施塔登
Owner X ENERGY LLC