Experimental investigation on melt coolability under bottom flooding with and without decay heat simulation

Singh, Nitendra; Kulkarni, Parimal P.; Nayak, Arun K.

doi:10.1016/j.nucengdes.2014.12.029

Cited by 14 publications

(3 citation statements)

References 12 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The ingression of the water into the melt pool and simulated vessel wall gaps imitate the cooling phenomena of bottom flooding. 25 The steam flow meter located in the steam line indicated an instantaneous large flow rate during this time (Figure 7). A sudden pressure drop of 17 mm WC was recorded, indicating the steam flow rate in the top flooded melt pool.…”

Section: Immediate Floodingmentioning

confidence: 95%

“…On the contrary, a significantly lower quenching time was observed for the bottom flooding. 25 In the bottom flooding approach, the water is injected from the bottom of the core catcher vessel using the nozzles. Due to the direct injection of water at the bottom into the melt pool, porous debris is created, which increases the effective melt-water interaction area, thus quenching the melt pool significantly.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Experimental investigations on melt coolability with simulated decay heat—The influence of delay time in flooding

2021

Self Cite

View full text Add to dashboard Cite

The primary objective of core catchers is to minimize the potential risk of core meltdown by stabilization and cooling of molten corium within the reactor containment for a prolonged period by strategically cooling it. Quenching of the high-temperature melt by top flooding strongly depends on the timing of injection of the cooling water, that is, immediate flooding or delayed flooding. To understand this aspect, we conducted experiments in a simulated core catcher of an Indian advanced nuclear reactor. In the experiments, sodium borosilicate glass, as a mixture of corium and sacrificial material simulant, was melted at about 1200°C and cooled by water from the side of a simulated core catcher and then flooding at the top of the melt pool. Two experiments were conducted; the first one was done with immediate flooding at the top of the melt pool; the second was performed with delayed top flooding of 45 min gap. The results show that immediate flooding quenches the melt pool rapidly compared to delayed flooding. A stable crust formation at the top of the melt pool and wall adhesion is observed in the delayed flooding. It was also found that no ingression of the water in the molten pool occurred with delayed flooding. On the other hand, with immediate flooding, water was found to ingress into the melt pool due to gap formations between melt and core catcher sidewall, causing the melt to break up through eruption by ingressed water. This phenomenon resulted in the formation of sand-type debris and in faster melt cooling.

show abstract

Section: Immediate Floodingmentioning

confidence: 95%

Section: Introductionmentioning

confidence: 99%

Experimental investigations on melt coolability with simulated decay heat—The influence of delay time in flooding

2021

Self Cite

View full text Add to dashboard Cite

show abstract

“…The ceramics/glass type materials such as sodium borosilicate glass, CaO-B 2 O 3 , CaO-TiO 2 , Bi 2 O 3 -TiO 2 and CaO-WO 2 etc. were used in the past melt coolabilityexperimets [2][3][4][5]. The simulant material is the material which have the thermo-physical properties similar or close to the properties of corium.…”

Section: Introductionmentioning

confidence: 99%

Thermo-Physical Properties of CaO-Fe2O3 Binary Mixture and its Application in the Field of Nuclear Reactor as Simulant Material

Jatav¹,

Pandey²,

Pandel³

et al. 2020

IJEAT

View full text Add to dashboard Cite

 Abstract: The simulant materials play important role in the melt coolability experiments to understand the actual scenarios of core melt accidents in the field of nuclear reactor. Simulant materials are generally oxide/ceramics materials which have the properties similar to the properties of corium (mixture of UO 2 , ZrO 2 , Zr alloy, Fe, Ni and Cr etc.). This work was carried out to determine the the properties of corium. It was observed that the thermo-physical properties of CaO-Fe 2 O 3 binary mixture are close to the properties of corium, so it can be said that this material is simulant material. In this research work, thermal behavior of CaO-Fe 2 O 3 was also carried out using differential scanning calorimetry (DSC). The simulant material CaO-Fe 2 O 3 can be used in the melt coolability experiment to understand the phenomena that happened during the core melt accidents in the nuclear reactor.

show abstract

Coolability of Heat-Generating Porous Debris Beds in Severe Accident Situations

Chakravarty

Datta

Ghosh

et al. 2018

Energy, Environment, and Sustainability

View full text Add to dashboard Cite

Experimental investigation on melt coolability under bottom flooding with and without decay heat simulation

Cited by 14 publications

References 12 publications

Experimental investigations on melt coolability with simulated decay heat—The influence of delay time in flooding

Experimental investigations on melt coolability with simulated decay heat—The influence of delay time in flooding

Thermo-Physical Properties of CaO-Fe2O3 Binary Mixture and its Application in the Field of Nuclear Reactor as Simulant Material

Coolability of Heat-Generating Porous Debris Beds in Severe Accident Situations

Contact Info

Product

Resources

About