Process for the production of a neutron absorbing pellet, the pellet obtained and the use thereof
US5242622A · kind A · utility
Assignees
Inventors
Key dates
| Filing date | Feb 15, 1991 |
| Grant date | Sep 7, 1993 |
| Priority date | — |
| Expiry date | Feb 15, 2011 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY02E30/30
- WIPO fieldEngines, pumps, turbines
- WIPO sectorMechanical engineering
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: PA0 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.; PA0 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; PA0 c) a sintering treatment is optionally carried out on said pellet; PA0 d) the pellet is or has been extracted from the mould; PA0 e) the pellet is optionally ground.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.