Question

How many percentage of fissionable U-235 occurring in uranium?

(a) 0.1%

(b) 0.5%

(c) 0.7%

(d) 1.5%

This question was addressed to me during an interview for a job.

This is a very interesting question from Nuclear Hazards and Accidents topic in chapter Social Issues and the Environment of Energy Management

Answer 1

Correct option is (c) 0.7%

To explain: Naturally occurring uranium contains only 0.7% of fissionable U-235, which is not enough for most types of rectors. It is necessary to increase the amount of U-235 by enrichment, although it is a difficult and expensive process.