Subsequently, relative distribution of burnup is measured by calculating relative burnup using the radiation signals thus measured.

Nuclear burning in the centre of stars is accompanied by shell-burning.

Russia has developed the whole nuclear fuel chain.

A traveling wave nuclear fission reactor, fuel assembly, and a method of controlling burnup therein.

A traveling wave nuclear fission reactor, fuel assembly, and a method of controlling burnup therein.

That means, it fully possesses the whole nuclear fuel cycle.

That means, it fully possesses the whole nuclear fuel cycle.

During this phase of peaceful nuclear combustion, their luminosity remains quite stable.

Not so with a star massive enough to sustain nuclear burning.

The nuclear fission of hydrogen yields a million times more energy than its chemical combustion; but it is much harder to control.

As other normal stars, these stars transformed their hydrogen into helium by nuclear burning.

As other normal stars, these stars transformed their hydrogen into helium by nuclear burning.

The main aim of said group of inventions is to obtain maximum uniformity of the power density field of a reactor and a maximum nuclear fuel burnup.

The invention provides fuel assemblies and reactor cores assembled from them which offer improved reactor performance and/or burnup rates and/or ease of manufacture.

With such an arrangement, relative distribution of specific burnup of the fuel assembly can be measured while ensuring reliability of measurement.