Element immersed in coolant of nuclear reactor

Details Element immersed in coolant of nuclear reactor Element immersed in coolant of nuclear reactor

1984-01-13

1986-08-19

Bentley, Stephen C.

Metal working

Method of mechanical manufacture

Shaping by direct application of fluent pressure

29517, 376209, 376327, B23P 1700

Patent

active

046061096

ABSTRACT:
The zirconium cladding of a coolant-displacement rod of a nuclear reactor is precollapsed in the zirconium oxide stack of pellets which supports the cladding. Current is conducted through the cladding in an atmosphere at reduced pressure containing residual oxygen, to heat the cladding to a temperature at which its yield strength is reduced. Then, while the rod remains at this temperature, it is subjected to isostatic pressure which collapses the cladding uniformly. The formation, by reason of exposure to neutron flux, of a long unsupported gap in the cladding which might be collapsed under the pressure of the coolant is precluded. In addition, the rod retains its symmetry. The outer surface of the cladding is oxidized, facilitating the movement of the rod into its thimbles of the core and improving the resistances of the cladding to reaction with the coolant.

REFERENCES:
patent: 3192621 (1965-07-01), Bauer et al.
patent: 3619810 (1971-11-01), Mefferd
patent: 3657793 (1972-04-01), Scharf et al.

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