This paper discusses results of a series of steam experiments using a prototypic material representing the molten core of nuclear power plant. Five experiments are discussed in detail in addition to a brief review of the previous experiments, where the focuses were on the effect of corium composition and external trigger on the strength of the steam explosion. A mixture of UO2:ZrO2 is used for the experiment, where the weight percent of each component is changed. One experiment was performed with corium at a composition of 70:30 without an external trigger as a reference case. Three tests were performed by using corium at the same composition with an external trigger. The last experiment was performed using corium at a composition of 80:20 with an external trigger. Various parameters are measured including the dynamic pressures on the wall of the test section and the dynamic force at the bottom of the test section. From the experimental data, the strength of the steam explosion was evaluated. It is shown that the strength of the steam explosion highly depends on the composition. A comparison between the cases with an external trigger and the cases without external trigger indicates that there is no substantial escalation of the strength of the explosion due to an external trigger.

1.
Corradini
M. L.
,
Kim
B. J.
and
Oh
M. D.
, “
Vapor Explosions in Light Water Reactors: A Review of Theory and Modeling
,”
Progress in Nuclear Energy
,
22
, No.
1
, pp.
1
117
(
1988
).
2.
Matsumura
K.
and
Nariai
H.
, “
Self-Triggering Mechanism of Vapor Explosions for a Molten Tin and Water System
,”
Journal of Nuclear Science and Technology
,
33
, No.
4
, pp.
298
306
(
1996
).
3.
X. Chen, R. Ruo, W. W. Yuen and T. G. Theofanous, “Experimental Simulation of Microinteractions in Large Scale Explosions,” Proceedings of the OECD/CSNI Specialist Meeting on Fuel Coolant Interactions, pp. 364–390, JAERI-Tokai, Japan (1997).
4.
D. E. Mitchell, M. L. Corradini and W. W. Tarbell, Intermediate Scale Steam Explosion Phenomena: Experiments and Analysis, SAND81-0124, SNL (1981).
5.
Yamano
N.
,
Maruyama
Y.
,
Kudo
T.
,
Hidaka
A.
and
Sugimoto
J.
,
Phenomenological Studies on Melt-Coolant Interactions in the ALPHA Program
,
Nuclear Engineering and Design
,
155
, pp.
369
389
(
1995
).
6.
D. H. Cho, D. R. Armstrong and W. H. Gunther, Experiments on Interactions between Zirconium-containing Melt and Water, NUREG/CR-5372 (1998).
7.
Magallon
D.
,
Huhtiniemi
I.
, and
Hohmann
H.
, “
Lessons Learnt from FARO/TERMOS Corium Melt Quenching Experiments
,”
Nuclear Engineering and Design
,
189
, pp.
223
238
(
1999
).
8.
Magallon
D.
and
Huhtiniemi
I.
, “
Corium Melt Quenching Tests at Low Pressure and Subcooled Water in FARO
,”
Nuclear Engineering and Design
,
204
, pp.
369
376
(
2001
).
9.
Huhtiniemi
I.
,
Magallon
D.
and
Hohmann
H.
, “
Results of Recent KROTOS FCI Tests: Alumina versus Corium Melts
,”
Nuclear Engineering and Design
,
189
, pp.
379
389
(
1999
).
10.
Huhtiniemi
I.
and
Magallon
D.
, “
Insight into Steam Explosions with Corium Melts in KROTOS
,”
Nuclear Engineering and Design
,
204
, pp.
391
400
(
2001
).
11.
Song
J. H.
,
Park
I. K.
,
Chang
Y. J.
,
Shin
Y. S.
,
Kim
J. H.
,
Min
B. T.
,
Hong
S. W.
and
Kim
H. D.
, “
Experiments on the Interactions of Molten ZrO2 with Water Using TROI Facility
,”
Nuclear Engineering and Design
,
213
, pp.
97
110
(
2002
).
12.
Song
J. H.
,
Park
I. K.
,
Sin
Y. S.
,
Kim
J. H.
,
Hong
S. W.
,
Min
B. T.
, and
Kim
H. D.
, “
Spontaneous Steam Explosions Observed in the Fuel Coolant Interaction Experiments Using Reactor Materials
,”
Journal of Korean Nuclear Society
,
33
, No.
4
, pp.
344
357
(
2002
).
13.
Song
J. H.
,
Park
I. K.
,
Sin
Y. S.
,
Kim
J. H.
,
Hong
S. W.
,
Min
B. T.
, and
Kim
H. D.
,
Fuel Coolant Interaction Experiments in TROI using a UO2/ZrO2 Mixture
,
Nuclear Engineering and Design
,
222
, pp.
1
15
(
2003
).
14.
J. H. Song, J. H. Kim, B. T. Min, S. W. Hong, An Effect of Corium Composition on the Mechanism of Prototypic Steam Explosions, The 11th International Topical Meeting on Nuclear Reactor Thermal-Hydraulics (NURETH-11), Paper: 114, Avignon, France, (2005)
15.
Hong
S. W.
,
Min
B. T.
,
Song
J. H.
,
Kim
H. D.
,
Application of Cold Crucible for Melting of UO2/ZrO2 Mixture
,
Materials Science and Engineering
A357
, pp.
297
303
(
2003
).
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