Experiments on aerosol removal by high-pressure water spray

Corno, Ada Del; Morandi, S.; Parozzi, F.; Araneo, L.; Casella, Francesco

doi:10.1016/j.nucengdes.2016.06.043

Cited by 30 publications

(6 citation statements)

References 5 publications

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“…The main experimental vessel presented consisted of a closed cuboid vessel (1.5 m 3 volume, 1.5 m high, and 1 m length and width) made of plexiglass, which was transparent in order to visually observe the internal environment in the vessel in real time (Corno et al, 2017). The erosol was injected at the bottom of the vessel.…”

Section: Experimental Facilitymentioning

confidence: 99%

Experimental Study on the Natural Deposition Characteristics of Erosols in Containment

Tian¹,

et al. 2020

Front. Energy Res.

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Against the background of the natural deposition of erosols in containment under severe accident conditions, a relevant experimental facility was designed and constructed to study the decay constant of the natural deposition of erosols. TiO2 was used as the erosol medium, and the decay constant of erosols was studied. The results show that when erosol concentration is < 15,000/cm3, the decay constant of erosols increases with the increase of the particle size. However, when it is ≥ 15,000/cm3, because the agglomeration of small particles into larger particles accelerates the deposition of particles with smaller size, the decay constant of erosols decreases first and then increases with the increase of the particle size. In addition, the effect of electrostatic on the decay constant of the natural deposition of erosols was studied. When the electrostatic effect is present, the decay constant of erosols increases significantly. Finally, the natural deposition characteristics of erosols were obtained.

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Section: Experimental Facilitymentioning

confidence: 99%

Experimental Study on the Natural Deposition Characteristics of Erosols in Containment

Tian¹,

et al. 2020

Front. Energy Res.

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“…In 2013, PASSAM (passive and active system of severe accident source term mitigation) was conducted to study the radioisotope trapping techniques under severe accident conditions. The objectives of this program were to reduce the airborne radioactive species and release mechanisms of fission products from the reactor vessel through filtration systems [13]. Moreover, the TOSQAN experiment program has been developed to perform the empirical as well as simulation study of thermohydraulic condition's representatives of a severe accident condition inside the reactor containment.…”

Section: Science and Technology Of Nuclear Installationsmentioning

confidence: 99%

Numerical Simulation of Decontamination of Airborne Fission Products during In-Vessel Release Phase by Containment Spray

Mehboob

2018

Science and Technology of Nuclear Installations

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The containment spray system (CSS) has a significant role in limiting the risk of radioactive exposure to the environment. In this work, the optimal droplet size and pH value of spray water to prevent the fission product release have been evaluated to improve the performance of the spray system during in-vessel release phase. A semikinetic model has been developed and implemented in MATLAB. The sensitivity and removal rate of airborne isotopes with the spray system have been simulated versus the spray activation and failure time, droplet size, and pH value. The alkaline (Na 2 S 2 O 3 ) spray solution and spray water with pH 9.5 have similar scrubbing properties for iodine. However, the removal rate from the CSS has been found to be an approximately inverse square of droplet diameter (1/ 2 ) for Na 2 S 2 O 3 and higher pH of spray water. The numerical results showed that 450 m-850 m droplet with 9.5 pH and higher or the alkaline (Na 2 S 2 O 3 ) solution with 0.2 m 3 /s-0.35 m 3 /s flow rate is optimal for effective scrubbing of in-containment fission products. The proposed model has been validated with TOSQAN experimental data.

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“…It must be noticed however, that the venting strategy has an inconvenient. Prior to the venting it is highly required by SAMGs to spray the containment in order to reduce the amount of radioactive aerosols and FP particles floating in the atmosphere [131,134,135], see Figure 3-2. If this particles are not washed out, they will be expelled to the environment.…”

Section: The Venting Strategymentioning

confidence: 99%

“…If this concentration is augmented enough, it could surpass the limits of sigma or lambda criterion and enter a more dangerous zone combustion regime. Studies like del Corno et al [135], suggest that only a couple minutes are needed to wash out all mayor particles, so keeping the spray actuation at minimum can help when dealing with hydrogen risk.…”

Section: The Venting Strategymentioning

confidence: 99%

“…The venting strategy does not have neither a starting point nor a fixed duration, so combinations of short, long, early and delayed venting are considered. The spray is set to function during 2000 seconds, based on particle retention studies [135] and it starts before the venting in all cases. It is assumed that the spray could start at any time during the transient even if the AC is not yet recovered thanks to the dedicated batteries or to the support of FLEX equipment [68].…”

Section: Sensitivity Analysis For Human Actionsmentioning

confidence: 99%

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Analysis and improvement of hydrogen mitigation strategies during a severe accident in nuclear containments

Fernández-Cosials¹

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Experiments on aerosol removal by high-pressure water spray

Cited by 30 publications

References 5 publications

Experimental Study on the Natural Deposition Characteristics of Erosols in Containment

Experimental Study on the Natural Deposition Characteristics of Erosols in Containment

Numerical Simulation of Decontamination of Airborne Fission Products during In-Vessel Release Phase by Containment Spray

Analysis and improvement of hydrogen mitigation strategies during a severe accident in nuclear containments

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