This is nothing to do with nuclear energy: see Wikipedia
Prophase is a stage of mitosis in which the chromatin condenses into a highly ordered structure called a chromosome (it is at this stage giemsa staining can be applied to elicit G-banding in chromosomes) in which the chromatin becomes visible. This process, called chromatin condensation, is mediated by the condensin complex. Since the genetic material has been duplicated in an earlier phase of the cell cycle, there are two identical copies of each chromosome in the cell. Identical chromosomes, called sister chromatids, are attached to each other at a DNA element present on every chromosome called the centromere.
In the Prophase. Nuclear envelope and nucleolus disappears.
The Nuclear membrane dissolves during prophase
Three problems associated with nuclear waste
late Prophase
Three problems associated with nuclear waste
In Prophase, the nuclear membrane disappears. In telophase, the nuclear membrane re-forms.
Nuclear
The area of technology associated with nuclear energy is nuclear technology. Forms of nuclear technology include nuclear reactors and nuclear weapons.
Nuclear energy
Three problems associated with nuclear waste
Cellular Division.
In the Prophase. Nuclear envelope and nucleolus disappears.