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Abstract

OF THE FISSION PRODUCTS WHICH WOULD BE RELEASED FROM THE CORE OF AN LWR IN THE EVENT OF A SEVERE ACCIDENT, ONLY THE NOBLE GASES AND POSSIBLY SOME OF THE IODINE (DEPENDING ON CHEMICAL FORM) ARE LIKELY NOT TO BE IN THE FORM OF AEROSOLS WHEN THEY REACH THE CONTAINMENT BUILDING ATMOSPHERE. FOLLOWING A SEVERE ACCIDENT IN AN LWR, A MAJOR COMPONENT OF THE CONTAINMENT ATMOSPHERE WILL BE STEAM. IF THE THERMODYNAMIC CONDITIONS ALLOW CONDENSATION OF THIS STEAM, THIS IS MOST LIKELY TO OCCUR ON THE AEROSOL PARTICLES. A MAJOR COMPONENT OF THE AEROSOL FORMED DURING THE IN-VESSEL RELEASE WILL BE FISSION PRODUCT CAESIUM. MUCH OF THIS WILL ENTER THE CONTAINMENT IN THE FORM OF THE HYDROXIDE WHICH HAS A GREAT AFFINITY FOR WATER, SO PARTICLE GROWTH DUE TO STEAM CONDENSATION IS LIKELY TO BE A VERY IMPORTANT MECHANISM FOR RETAINING RADIOACTIVE CAESIUM WITHIN THE CONTAINMENT BUILDING. THE REPORT PROVIDES A SYSTEMATIC REVIEW OF THE BASIC CHEMICAL AND PHYSICAL ISSUES WHICH MUST BE ADDRESSED IF THE PHENOMENA ARE TO BE MODELLED ACCURATELY, AND GIVES RECOMMENDATIONS ON HOW COMPUTER MODELS OF CONDENSATION ON TO SOLUBLE AEROSOLS SHOULD BE CONSTRUCTED.

Additional information

Authors: DUNBAR I H UKAEA, UK, UKAEA, UK
Bibliographic Reference: EUR 11807 EN (1988) FS, PP 47, ECU 12.50, AVAILABILITY: EUROFFICE, LUXEMBOURG, BP 1003, GDL
Availability: Can be ordered online
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