Impact of Zr metal and coking reactions on the ex-vessel source term predictions of CORCON/VANESA
During a core meltdown accident in a LWR, molten core materials (corium) could leave the reactor vessel and interact with concrete. In this paper, the impact of the zirconium content of the corium pool and the coking reaction on the release of fission products are quantified using CORCON/Mod2 and VANESA computer codes. Detailed calculations show that the total aerosol generation is proportional to the zirconium content of the corium pool. Among the twelve fission product groups treated by the VANESA code, CsI, Cs/sub 2/O and Nb/sub 2/O/sub 5/ are completely released over the course of the core/concrete interaction, while an insignificant quantity of Mo, Ru and ZrO/sub 2/ are predicted to be released. The release of BaO, SrO and Ce/sub 2/O increase, while the releases of Te and La/sub 2/O/sub 3/ are relatively unaffected by the Zr content of the corium pool. The impact of the coking reaction on the radionuclide release and aerosol production was found to be insignificant.
- Research Organization:
- Brookhaven National Lab., Upton, NY (USA); Nuclear Regulatory Commission, Washington, DC (USA)
- DOE Contract Number:
- AC02-76CH00016
- OSTI ID:
- 6190347
- Report Number(s):
- BNL-NUREG-39222; CONF-870816-9; ON: TI87005862
- Country of Publication:
- United States
- Language:
- English
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22 GENERAL STUDIES OF NUCLEAR REACTORS
220900* -- Nuclear Reactor Technology-- Reactor Safety
ACCIDENTS
AEROSOLS
BUILDING MATERIALS
BWR TYPE REACTORS
COLLOIDS
COMPUTER CALCULATIONS
CONCRETES
CORIUM
DATA
DISPERSIONS
ELEMENTS
ENERGY TRANSFER
FISSION PRODUCT RELEASE
FLUID MECHANICS
FLUID-STRUCTURE INTERACTIONS
HEAT TRANSFER
HYDRAULICS
INFORMATION
MATERIALS
MECHANICS
MELTDOWN
METALS
NUMERICAL DATA
PWR TYPE REACTORS
RADIOACTIVE AEROSOLS
REACTOR ACCIDENTS
REACTORS
SOLS
THEORETICAL DATA
TRANSITION ELEMENTS
WATER COOLED REACTORS
WATER MODERATED REACTORS
ZIRCONIUM