Neutron absorber rod
Description
Purpose: To extend mechanical and nuclear life time of neutron absorber rods. Constitution: Europium hexafluoride powder is filled as neutron absorbers to the inside of a fine diameter and great length cladding pipe made of stainless steels, and arranged at an equi-distance by means of stainless steel balls, and both of upper and lower ends of the pipe are closed tightly with end plugs to constitute a neutron absorber rod. When europium hexafluoride is used as the neutron absorber, neutrons are absorbed by B-10 and Eu. Among them, while B-10 forms He gas due to (n, α), Eu forms no He gas since most of Eu causes (n, γ) reaction. Accordingly, the amount of the He gas formed is reduced, as compared with the case of using boron carbide, thereby enabling to suppress the volumic expansion of the cladding pipe. (Sekiya, K.)
Availability note (English)
Available from JAPIO. Also available from INPADOC.Additional details
Publishing Information
- Imprint Pagination
- 3 p.
- IPC:
- Int. Cl. G21C7/24.
- IPC
- Int. Cl. G21C7/24.
- Patent number
- JP patent document 63-261194/A/
INIS
- Country of Publication
- Japan
- Country of Input or Organization
- Japan
- INIS RN
- 20037746
- Subject category
- S21: SPECIFIC NUCLEAR REACTORS AND ASSOCIATED PLANTS;
- Resource subtype / Literary indicator
- Non-conventional Literature
- Descriptors DEI
- BWR TYPE REACTORS; CONTROL ELEMENTS; CRACKS; EUROPIUM BORIDES; EXPANSION; FUEL CANS; HELIUM; IRRADIATION; NEUTRON ABSORBERS; REDUCTION; STAINLESS STEELS; STRESSES
- Descriptors DEC
- ALLOYS; BORIDES; BORON COMPOUNDS; CARBON ADDITIONS; CHEMICAL REACTIONS; ELEMENTS; ENRICHED URANIUM REACTORS; EUROPIUM COMPOUNDS; HIGH ALLOY STEELS; IRON ALLOYS; IRON BASE ALLOYS; NONMETALS; POWER REACTORS; RARE EARTH COMPOUNDS; RARE GASES; REACTOR COMPONENTS; REACTORS; STEELS; THERMAL REACTORS; WATER COOLED REACTORS; WATER MODERATED REACTORS
Optional Information
- Secondary number(s)
- JP patent application 62-95248.