Process for the production of a neutron absorbing pellet, the pellet obtained and the use thereof
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United States of America Patent
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Sep 7, 1993
Issued Date -
N/A
app pub date -
Feb 15, 1991
filing date -
Sep 15, 1988
priority date (Note) -
Expired
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Abstract
The invention relates to a process for the production of a neutron absorbing pellet for use in a nuclear reactor control device, comprising the following stages: a) compactable products are prepared incorporating as % by weight electrolytic crystals or chips of Hf and optionally boron carbide powder with a total weight (HF+B.sub.4 C) of 40 to 100%, the Hf:(Hf+B.sub.4 C) ratio being 0.20 to 1 and optionally other metallic elements melting at above 400.degree. C.; b) these products are mixed and compressed in a mould in one or more filling and compression operations until a pellet is obtained with an apparent density higher than 80% of its average density in the solid state; c) a sintering treatment is optionally carried out on said pellet; d) the pellet is or has been extracted from the mould; e) the pellet is optionally ground.
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