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Process for producing a wear-resistant and corrosion-resistant stainless steel part for a nuclear reactor, corresponding part and corresponding control cluster

A nuclear reactor and stainless steel technology, applied in the control of nuclear reactions, reactor fuel elements, reactors, etc., can solve problems such as insufficient corrosion resistance and rust

Active Publication Date: 2014-07-30
FRAMATOME ANP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0007] However, some surfaces so nitrided have been found to have insufficient corrosion resistance and may start to rust during transport after manufacture, during storage or when the control cluster is run

Method used

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  • Process for producing a wear-resistant and corrosion-resistant stainless steel part for a nuclear reactor, corresponding part and corresponding control cluster
  • Process for producing a wear-resistant and corrosion-resistant stainless steel part for a nuclear reactor, corresponding part and corresponding control cluster
  • Process for producing a wear-resistant and corrosion-resistant stainless steel part for a nuclear reactor, corresponding part and corresponding control cluster

Examples

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Embodiment Construction

[0038] exist figure 1 In , part of the nuclear fuel assembly 1 and part of the control cluster 3 can be seen, which control the reactivity of the core of the nuclear reactor in which the assembly 1 is loaded.

[0039] Conventionally, assembly 1 comprises a bundle of nuclear fuel rods (not shown) and a framework 5 that holds and supports the bundle. The skeleton 5 includes a lower end piece 7 , an upper end piece 9 and a conduit 11 connecting the lower end piece 7 and the upper end piece 9 . A single guide tube 11 is shown in figure 1 middle.

[0040] Control cluster 3 includes only the figure 1 A neutron absorbing rod 13 and a spider structure 15 are seen in the figure, which support and hold the absorbing rod 13 in position so that they are parallel to each other and along the same path as the conduit 11 of the assembly 1 The grid array is placed laterally with control clusters 3 on the assembly 1 .

[0041] The trivet structure 15 comprises a link body part 17, which co...

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Abstract

This process comprises steps of: providing a stainless steel preform, shaping the preform, finishing the preform in order to form the stainless steel part (21, 27), the finishing step making it possible to prevent the appearance of or to eliminate work hardening at the outer surface (29, 31) of the part (21, 27), and hardening of the outer surface (29, 31) of the part (21, 27) by diffusion of atomic species.

Description

technical field [0001] The present invention relates to the manufacture of components of stainless steel, the wear and corrosion resistance of which is improved via hardening by diffusion of one or more atomic species. [0002] The invention is particularly suitable for the manufacture of neutron absorbing rods intended for use in light water reactors (LWR) and in particular pressurized water reactors (PWR). Background technique [0003] Neutron absorbing rods are usually grouped into control clusters. Of these tufts, some tufts often move in and rub against the guides during operation. These clusters also vibrate under the influence of the water flow. Thus, the rods contained therein run the risk of becoming worn and losing some of their neutron-absorbing capacity, which is the essence of reactor safety. The cladding and end plugs of neutron absorbing rods are especially exposed to this wear risk. [0004] In particular, when using the reactor in load-following mode, th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C8/02C23C8/38C23C8/26C23C8/22C21D6/00C21D8/02C21D9/08G21C3/07
CPCC21D6/004C21D8/0257C21D9/08C23C8/02C23C8/22C23C8/26C23C8/38G21C7/10G21C21/18Y02E30/30C21D1/19C21D8/0278C21D8/0473C23C8/32G21C3/07G21C7/117C21D1/72
Inventor 多米尼克·赫兹
Owner FRAMATOME ANP