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Chemical processes in the reactor coolant system under accident conditions

Conference ·
OSTI ID:7051815
;

Uncertainty analyses of the potential revaporization of radionuclides in the reactor coolant system are presented. These results indicate deposited Cs, I, Te and to some extent Ru and Ba have significant probabilities of revaporizing from the reactor coolant system once the reactor coolant system has been breached and natural convection causes a flow from the reactor containment building through the coolant system. The magnitude of the revaporization depends critically on the chemical form of the deposited material. Experimental studies of CsI transport behavior in high temperature steam indicate CsI may decompose yielding a volatile form of iodine and leaving cesium bound to structural surfaces in a form substantially less volatile than CsI or CsOH. A factorial design test series considering the variables of flow velocity, surface area, cesium iodide-to-steam concentration ratio, and oxygen potential has been conducted to establish the kinetics of cesium iodide decomposition. A model of the kinetic processes is suggested. 14 refs., 4 figs., 2 tabs.

Research Organization:
Sandia National Labs., Albuquerque, NM (USA)
DOE Contract Number:
AC04-76DP00789
OSTI ID:
7051815
Report Number(s):
SAND-88-2290C; CONF-881014-4; ON: DE88015691
Country of Publication:
United States
Language:
English

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Related Subjects

22 GENERAL STUDIES OF NUCLEAR REACTORS
220502 -- Nuclear Reactor Technology-- Environmental Aspects-- Radioactive Effluents
220900* -- Nuclear Reactor Technology-- Reactor Safety
ACCIDENTS
ALKALI METAL COMPOUNDS
ALKALI METALS
ALKALINE EARTH METALS
BARIUM
CESIUM
CESIUM COMPOUNDS
CESIUM IODIDES
CHEMICAL REACTION KINETICS
CONTAINMENT
COOLING SYSTEMS
DEPOSITION
ELEMENTS
ENERGY SYSTEMS
FLUIDS
GASES
HALIDES
HALOGEN COMPOUNDS
HALOGENS
INORGANIC PHOSPHORS
IODIDES
IODINE
IODINE COMPOUNDS
ISOTOPES
KINETICS
METALS
NONMETALS
PHOSPHORS
PLATINUM METALS
RADIOISOTOPES
REACTION KINETICS
REACTOR ACCIDENTS
REACTOR COMPONENTS
REACTOR COOLING SYSTEMS
REACTOR SAFETY
RUTHENIUM
SAFETY
SEMIMETALS
TELLURIUM
TRANSITION ELEMENTS
VAPORS