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Fission product release during MCCI. CEC nuclear safety program: MCCI project

Abstract

The assessment of the consequences of severe accidents in nuclear reactors involving molten core-concrete interactions (MCCls) requires estimates of the quantities and physicochemical forms of the radioactive species released from the melt into the cavity atmosphere. Such estimates in turn require a detailed knowledge of the complex chemical interactions which would occur between the fission products, fuel and the components of the core structural materials and the concrete. In recent years, effort has been put into the thermodynamic characterization of these processes. The results of such studies are important for predicting several aspects of MCCls, including: 1. The release of species by vaporization; 2. the extent of concrete penetration: a. The melt solidus and liquidus temperatures, which in turn affect the heat transfer processes and hence tile predictions of the melt temperature and the onset of solidification, b. the amounts of the solid and liquid phases and the respective compositions, which determines the viscosity of the melt, and c. the composition of the crust formed following the addition of water to quench the interaction. d. the distribution of fission products among metallic and oxidic phases. This SOAR is devoted to thermochemical calculations in the context of MCCI where most fission  More>>
Authors:
Cenerino, G; [1]  Cordfunke, E H.P.; [2]  Hunterlaar, M E [2] 
  1. CEA Centre d`Etudes Nucleaires de Fontenay-aux-Roses, 92 (France). Inst. de Protection et de Surete Nucleaire
  2. Netherlands Energy Research Foundation (ECN), Petten (Netherlands)
Publication Date:
Jan 01, 1995
Product Type:
Technical Report
Report Number:
ECN-RX-95-003
Reference Number:
SCA: 210100; 210200; PA: AIX-27:011178; EDB-96:035551; NTS-96:012571; SN: 96001539461
Resource Relation:
Other Information: PBD: Jan 1995
Subject:
21 NUCLEAR POWER REACTORS AND ASSOCIATED PLANTS; CORIUM; CONCRETES; MELTDOWN; FISSION PRODUCT RELEASE; BWR TYPE REACTORS; CHEMICAL REACTIONS; COMPUTER CALCULATIONS; PWR TYPE REACTORS; THERMODYNAMICS
OSTI ID:
180872
Research Organizations:
Netherlands Energy Research Foundation (ECN), Petten (Netherlands)
Country of Origin:
Netherlands
Language:
English
Other Identifying Numbers:
Other: ON: DE96612252; TRN: NL95FM132011178
Availability:
INIS; OSTI as DE96612252
Submitting Site:
NLN
Size:
24 p.
Announcement Date:

Citation Formats

Cenerino, G, Cordfunke, E H.P., and Hunterlaar, M E. Fission product release during MCCI. CEC nuclear safety program: MCCI project. Netherlands: N. p., 1995. Web.
Cenerino, G, Cordfunke, E H.P., & Hunterlaar, M E. Fission product release during MCCI. CEC nuclear safety program: MCCI project. Netherlands.
Cenerino, G, Cordfunke, E H.P., and Hunterlaar, M E. 1995. "Fission product release during MCCI. CEC nuclear safety program: MCCI project." Netherlands.
@misc{etde_180872,
title = {Fission product release during MCCI. CEC nuclear safety program: MCCI project}
author = {Cenerino, G, Cordfunke, E H.P., and Hunterlaar, M E}
abstractNote = {The assessment of the consequences of severe accidents in nuclear reactors involving molten core-concrete interactions (MCCls) requires estimates of the quantities and physicochemical forms of the radioactive species released from the melt into the cavity atmosphere. Such estimates in turn require a detailed knowledge of the complex chemical interactions which would occur between the fission products, fuel and the components of the core structural materials and the concrete. In recent years, effort has been put into the thermodynamic characterization of these processes. The results of such studies are important for predicting several aspects of MCCls, including: 1. The release of species by vaporization; 2. the extent of concrete penetration: a. The melt solidus and liquidus temperatures, which in turn affect the heat transfer processes and hence tile predictions of the melt temperature and the onset of solidification, b. the amounts of the solid and liquid phases and the respective compositions, which determines the viscosity of the melt, and c. the composition of the crust formed following the addition of water to quench the interaction. d. the distribution of fission products among metallic and oxidic phases. This SOAR is devoted to thermochemical calculations in the context of MCCI where most fission products and the metallic components of the melt are transferred into an oxidic form sooner or later. Calculations on fission product release from a molten pool without MCCI are underway in the source term project of the CEC-RCA. The following conditions have to be taken into account in order to be able to perform reliable thermodynamic calculations. (orig./HP).}
place = {Netherlands}
year = {1995}
month = {Jan}
}