Fission product release from LWR fuel defected in steam in the temperature range 500 to 1600/sup 0/C

Conference · Mon Jan 01 04:00:00 EST 1979

OSTI ID:5855333

Lorenz, R. A.; Collins, J. L.; Osborne, M. F.; Malinauskas, A. P.

For practical purposes the release of cesium and iodine from LWR fuel rods in the temperature range 500 to 1600/sup 0/C can be considered to originate from three sources: (1) the gap inventory with release by both burst (vented gas) and diffusion; (2) grain boundary with release by tunnel formation; and (3) UO/sub 2/ matrix with release by solid state diffusion. The chemical behavior of released iodine and cesium (at least after contact with steam) is predominantly that of CsI and CsOH. Fission gas release is the sum of the plenum inventory, gas embedded in the fuel and cladding surface layers and that released by tunnel formation, and solid state diffusion from the UO/sub 2/ matrix. A small amount of large particle-sized fuel dust is ejected at time of rupture.

• Research Organization: Oak Ridge National Lab., TN (USA)
• DOE Contract Number: W-7405-ENG-26
• OSTI ID: 5855333
• Report Number(s): CONF-790935-3
• Country of Publication: United States
• Language: English

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210200 -- Power Reactors
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Light-Water Moderated
Nonboiling Water Cooled
ACCIDENTS
BWR TYPE REACTORS
FISSION PRODUCT RELEASE
FUEL ELEMENT FAILURE
FUEL ELEMENTS
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LOSS OF COOLANT
PWR TYPE REACTORS
REACTOR ACCIDENTS
REACTOR COMPONENTS
REACTORS
SIMULATION
WATER COOLED REACTORS
WATER MODERATED REACTORS