Development of Refractory Material from Water Quenched Granulated Ferrochromium Slag

During a severe accident with a vessel failure, corium relocates from the vessel into the reactor cavity (PWR) or pedestal (BWR) and accumulates on top of the cavity floor to form a corium pool. This corium pool is hot enough to cause a Molten Corium-Concrete Interaction (MCCI) that can ablate the concrete structure even if water is present on top of the corium. MCCI will also produce steam and other gases that increase containment pressure as well as generate combustible gases (Hydrogen and Carbon Monoxide). Current MAAP5* calculations with conservative assumptions have shown that the ablation depth in a basemat constructed of siliceous concrete can be larger than the depth of liner, even if the reactor cavity is flooded by water. To retain the melt in the containment and to cool the corium pool before the erosion reaches the liner plate, several approaches are being considered. One of these approaches is the installation of a protective layer on top of the concrete floor to retard MCCI. The purpose of this paper is to study the performance of different protective materials under postulated severe accident conditions. The candidates for the protective materials are refractory materials and limestone/limestone-common-sand (LCS) concrete. The refractory material was chosen based on the thermal performance and dissolution rate of the refractory material calculated by analytical calculations and also by MAAP5. Adding the refractory protective material protects the underlying concrete basemat from melting temporarily, so that water ingression into the surface of the corium is not initially affected by addition of the concrete material. *MAAP5 is an integrated severe accident code owned by the Electric Power Research Institute and developed by Fauske and Associates, LLC.

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Prevention of Adhesion of Alumina Inclusions onto Submerged Entry Nozzle by Refractory Material Containing MgO and Al

Tetsu-to-Hagane ◽

10.2355/tetsutohagane.98.10 ◽

2012 ◽

Vol 98 (1) ◽

pp. 10-18 ◽

Cited By ~ 2

Author(s):

Yutaka Awajiya ◽

Mikio Suzuki ◽

Keiji Watanabe ◽

Koichi Tsutsumi ◽

Yasuo Kishimoto ◽

...

Keyword(s):

Refractory Material ◽

Submerged Entry Nozzle

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Study of the stochastic clustering on the refractory material surface under the effect of plasma load in the PLM device

Journal of Physics Conference Series ◽

10.1088/1742-6596/1383/1/012015 ◽

2019 ◽

Vol 1383 ◽

pp. 012015

Author(s):

V P Budaev ◽

S D Fedorovich ◽

Yu V Martynenko ◽

A V Karpov ◽

D N Gerasimov ◽

...

Keyword(s):

Refractory Material ◽

Material Surface ◽

Plasma Load

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Study of structural, electronic, optical and thermal properties of refractory material (CrAlB)

Materials Chemistry and Physics ◽

10.1016/j.matchemphys.2018.02.043 ◽

2018 ◽

Vol 211 ◽

pp. 242-248 ◽

Cited By ~ 6

Author(s):

Anugya Rastogi ◽

Priyanka Rajpoot ◽

U.P. Verma

Keyword(s):

Thermal Properties ◽

Refractory Material

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Reaction between MgO-SiO2 refractory material and Fe-Al alloy

Metallurgical Research & Technology ◽

10.1051/metal/2018079 ◽

2018 ◽

Vol 115 (5) ◽

pp. 512 ◽

Cited By ~ 2

Author(s):

Abdulaziz Alhussein ◽

Piotr R. Scheller ◽

Wen Yang

Keyword(s):

Refractory Material ◽

Reaction Rate ◽

Interface Layer ◽

Al Alloy ◽

Single Particles ◽

Spinel Layer ◽

Reduction Of Iron ◽

Rate Controlling Step ◽

High Frequency Induction Furnace ◽

High Frequency Induction

The interaction between molten Fe-Al alloy containing 5.1 wt.% aluminium and MgO-SiO2-based refractory was investigated. In high-frequency induction furnace at 1550 °C refractory samples were immersed in liquid alloy for 1 min, 2 min, 10 min, 20 min, 30 min and 60 min. Scanning electron microscope was employed to investigate phases at the interface and inclusions in the Fe-Al alloy. Forsterite phase in refractory was transformed to MgO·Al2O3 spinel, owing to the reduction of iron oxide and silica in forsterite by aluminium in the Fe-Al alloy at the interface. The interface layer separated locally from the refractory material and formed cluster and single particles in the Fe-Al alloy. In view on the reaction rate, the disintegration of the refractory material increased the reaction area but interfered with increasing thickness of the spinel layer. The dissolution rate of silica into the molten alloy decreased with increasing the reaction time because of the slowed down transport of aluminium diffusing through increasing spinel layer became the rate controlling step.

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