non-fissionable

And this uranium then can be mixed with non-fissionable U238 to make it difficult to be used for bomb making.

What is the evidence against warmer MWP? « Climate Audit 2006

It relies upon thousands of linked separators, also known as "calutrons" to create U-238 from non-fissionable U-235.

Exultate Justi 2002

In a breeder reactor, "fast" neutrons are captured by non-fissionable U-238 - a process which results in the production of U-239, which, in turn, decays to Pu Plutonium-239.

Exultate Justi 2002

It relies upon thousands of linked separators, also known as "calutrons" to create U-238 from non-fissionable U-235.

Archive 2002-12-01 2002

In a breeder reactor, "fast" neutrons are captured by non-fissionable U-238 - a process which results in the production of U-239, which, in turn, decays to Pu Plutonium-239.

Archive 2002-12-01 2002

They can produce new nuclear fuel out of non-fissionable material, thus increasing the amount available to supplement the only naturally occurring fissionable element-the 0.7% of uranium which has atomic weight 235.

The Peacetime Applications of Atomic Energy 1955

Hence every uranium reactor produces this new fuel from the non-fissionable uranium 238.

The Peacetime Applications of Atomic Energy 1955

One of the remaining l. 5 neutrons might produce an atom of the new nuclear fuel out of the non-fissionable isotope to replace the atom consumed.

The Peacetime Applications of Atomic Energy 1955

Centrifuges do not remove impurities, they enrich the fuel by increasing the proportion of fissionable U-235 relative to the proportion of non-fissionable U-238.

Yahoo! Buzz US: Top Stories 2009

While the bomb described in the story didn’t exactly resemble that being constructed in Los Alamos, the story’s descriptions of difficulties in separating uranium into fissionable and non-fissionable isotopes did speak of one of the major problems currently under investigation at the Manhattan Project.

Boing Boing 2005