Shutdown margin

{
  "id": "MLC-T-NUC-000477",
  "term": "Shutdown margin",
  "field": "Nuclear energy and radiation",
  "definition": "The instantaneous amount of reactivity by which the reactor is subcritical or would be subcritical from its present condition assuming all full-length rod cluster assemblies (shutdown and control) are fully inserted except for the single rod cluster assembly of highest reactivity worth that is assumed to be fully withdrawn.",
  "references": [
    "NRC Glossary"
  ],
  "url": "https://mlchart.com/terminology/nuclear/shutdown-margin/"
}