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IMPACT ON RADIOLOGICAL BARRIERS AND CONTROLS AT FACILITIES
Radiological barriers and controls

FUEL MELT CRITERIA, POINTS TO NOTE

 

Before we move on to other types of criteria, here are a few key points to remember.

  • If fuel damage or degradation results in a release of less than 0.1% of the core inventory, the event should be rated at Below scale/LevelĀ 0 under this criterion and then considered under the defence-in-depth criteria.
  • When referring to the inventory, it means the whole core inventory of radioactive materials, not just the 'gap' inventory (i.e. the free fission product gases).
  • The rating based on these criteria does NOT depend on whether the primary circuit is intact.
  • To enable early rating, these criteria should be translated into measurable parameters if possible, noting that it is only necessary to estimate whether
    total release > 0.1% of total inventory