CORCON-MOD3: An integrated computer model for analysis of molten core-concrete interactions. User`s manual

Abstract

The CORCON-Mod3 computercode was developed to mechanistically model the importantcore-concrete interactionphenomena, including those phenomena relevant to the assessment of containmentfailure and radionuelide release. The code can be applied to a wide range of severe accident scenarios and reactorplants. The code represents the current state of the art for simulating core debris interactions with concrete. This document comprises the user's manual and gives a brief description of the models and the assumptions and limitations in the code. Also discussed are the input parametersand the code output. Two sample problems are also given.

Heat & mass transfer and interface temperature during simulated melt-concrete interaction with composition variation in ARTEMIS 2D experiment

“…With this approach the mushy zone was treated as thermal resistance, which reduces the heat-transfer between the bulk of the melt and this interface. The mushy zone was a highly viscous layer which affected gas flow (resulting from the decomposition of concrete); gas accumulation at the interface could also affect heat transfer (Bradley et al, 1993;Foit et al, 1995). In the 90's the interface condition T i = T liquidus , assuming the existence of a refractory crust at the interface, was applied to the corium-concrete interaction (Seiler, 1996;Seiler and Froment, 2000).…”

Considerations on ex-vessel corium behavior: Scenarios, MCCI and coolability

“…In the more traditional view of the codes WECHSL (Foit et al, 1995) and CORCON (Cole et al, 1984;Bradley et al, 1993), this is accounted for by considering an interface condition for the formation of crusts along the melt boundaries Fig. 3.…”

“…Emphasis has been laid on heat transfer over layers at the melt/concrete interface. Either gas layers (or direct bubble nucleation) in WECHSL (Foit et al, 1995) and earlier CORCON versions (Cole et al, 1984) or slag layers in newer CORCON versions (Bradley et al, 1993) are considered. In both codes, the resistance of heat transfer from the bulk of overlying melt (or melt layers) is assumed as much lower.…”

Verification for Flow Analysis Capability in the Model of Three-Dimensional Natural Convection with Simultaneous Spreading, Melting and Solidification for the Debris Coolability Analysis Module in the Severe Accident Analysis Code 'SAMPSON'. (II).

“…The properties of the concrete were obtained from the literature 13) without a concrete temperature-enthalpy correlation. The correlation of limestone/common sand concrete 17) was used in the present verification, since little information is available for silica concrete which was used in the experiment and the property differences were considered to be small between silica and limestone/common sand for the limited temperature range in a short spreading period.…”

“…The temperature-enthalpy correlation of limestone/common sand concrete 17) was used in the present verification, since little information is available for silica concrete which was used in the experiment and the property differences were considered to be small between silica and limestone/common sand for the limited temperature range in a short spreading period. The temperature-enthalpy correlation of silica concrete would be needed for the analysis of long-term debris concrete interaction.…”