Method of evaluating the integrity of the outer carbon layer of

Details Method of evaluating the integrity of the outer carbon layer of Method of evaluating the integrity of the outer carbon layer of

1979-06-13

1980-10-07

Smith, Alfred E.

Radiant energy

Automatic/serial detection of similar sources

250323, 2504751, 176 19LD, G03B 4116, G03C 1516, G21C 1700

Patent

active

042270812

ABSTRACT:
This invention relates to a method for determining defective final layers of carbon on triso-coated fuel particles and the like. Samples of the particles are subjected to a high temperature treatment with gaseous chlorine and thereafter radiographed. The chlorine penetrates through any defective carbon layer and reacts with the underlying silicon carbide resulting in the volatilization of the silicon as SiCl.sub.4 leaving carbon as a porous layer. This porous carbon layer is easily detected by the radiography.

REFERENCES:
patent: 2851338 (1958-09-01), Johns et al.
patent: 4172224 (1979-10-01), Lapinski et al.
Foster et al., "Measurement of Carbon Coating Thickness on Microspheres of Nuclear Fuels," Materials Evaluation, 1-70, pp. 13-16.
Pechin et al., "Inspection of High-Temperature Gas-Cooled Reactor Recycle Fuel," ORNL-S16S, Jun. 1977, p. 25.

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