Evolution Charts

After 12 Days

The evolution of the waste stream becomes apparent when we analyze the relative contribution of groups of isotopes over time.  The Time_Bin characteristic aggregates the 1322 nuclides into nine groups.  Here’s an Excel chart that shows the composition of the waste getting proportionally more stable as the reactor gets older.  After a MegaSec, the hot isotope population (HL < 1 day) is no longer growing.  Their proportional contribution to the whole (normalized yield) is dropping.  Their population has leveled out,  but their daughters continue to grow.  Stable isotopes will only grow in population, unless they capture neutrons.

The Mass is 2Meg atoms at MSec and 2Gig atoms at GSec.  “Mass” is approximate.

Yikes! A bit of sensitivity testing— Average AtWt varies a lot!

  • Day: 122
  • Year: 129
  • Millenia: 111
  • Primordial: 123
  • Stable: 118

Guess I should change the Y-axis title to Population, or rather relative population.

The Full Span

The chart above focuses on the last ten (eleven) time steps.  A chart of the entire sim run is more colorful.

Evolution to Stability

Each chart is tailored to color the shorter-lived isotopes in hot colors, fading to black as the nuclei become stable.

These charts are still in development.  The y-axis isn’t quite right yet.  Normalized Yield runs from 0 to 2.0 atoms, not 0-100%.  The x-axis of the upper chart is more descriptive but,

  1. Not all of the TimeSteps have names, and
  2. They wouldn’t fit if they did.