LWR severe accident simulation: Iodine behaviour in FPT2 experiment and advances on containment iodine chemistry

Girault, N.; Bosland, L.; Dickinson, S.; Funke, F.; Güntay, S.; Herranz, L.E.; Powers, D.A.

doi:10.1016/j.nucengdes.2011.11.011

Cited by 20 publications

(8 citation statements)

References 55 publications

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“…The SOPHAEROS module used a 0D approach to compute iodine chemistry. The implementation of iodine mechanism in SOPHAEROS has to be sufficiently flexible due to on-going researches on iodine behaviour during a severe accident (Bosland et al, 2010;Cantrel et al, 2014;Girault et al, 2012). The 0D box model is defined with a fixed volume.…”

Section: Model Presentationmentioning

confidence: 99%

“…This speciation and concentration are not easy to define near the nuclear power plant. Iodine speciation in the containment depends on several parameters such as temperature, water, and gaseous dose rate, sump pH, organic compounds (Cantrel et al, 2014;Girault et al, 2012). The speciation is governed by the competition between the iodine formation/desorption and destruction/adsorption processes that take place in the atmosphere of the containment and in the water.…”

Section: Iodine Speciation and Amountmentioning

confidence: 99%

“…The main iodine species formed are inorganic iodine considered as molecular iodine, organic iodine represented by the most volatile one, the iodomethane CH3I and iodine oxide. With these three kind of species, taking into account several radiolytic and thermal reactions, it is possible in a severe accident code to model integral experiments such as ones from the Phebus FP (Fission Product) Program (Girault et al, 2012). The iodine oxides are known to nucleate and form particles (Hoffmann et al, 2001;Saunders and Plane, 2006).…”

Section: Iodine Speciation and Amountmentioning

confidence: 99%

See 2 more Smart Citations

Box modelling of gas-phase atmospheric iodine chemical reactivity in case of a nuclear accident

Fortin

Fèvre-Nollet

Cousin

et al. 2019

Atmospheric Environment

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Section: Model Presentationmentioning

confidence: 99%

Section: Iodine Speciation and Amountmentioning

confidence: 99%

Section: Iodine Speciation and Amountmentioning

confidence: 99%

See 1 more Smart Citation

Box modelling of gas-phase atmospheric iodine chemical reactivity in case of a nuclear accident

Fortin

Fèvre-Nollet

Cousin

et al. 2019

Atmospheric Environment

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“…Their results have been found to be in good agreement with the TOSQAN experimental results. Several experimental studies have been conducted to understand the behavior of fission product, radioactive iodine chemistry, and its transportation [15][16][17].…”

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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“…Experimental research on FP release behavior was conducted by many investigators [11][12][13]. Many experiments had played a significant role in understanding the behavior of aerosols, FPs, iodine chemistry, and transportation under accident situations [13][14][15][16][17]. The Phébus-FP project [18] was the most impressive program initiated to study the behavior of FP.…”

Section: Introductionmentioning

confidence: 99%

Numerical Simulation of Fission Product Behavior Inside the Reactor Containment Building Using MATLAB

Mehboob¹,

Aljohani²

2018

Numerical Simulations in Engineering and Science

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The aim of this work is to carry out the numerical simulation of fission product (FP) behavior inside the reactor building under loss of coolant accident (LOCA) using MATLAB. For this purpose, a kinetic model has been developed and implemented in MATLAB to study the behavior of in-containment FPs during postulated LOCA for typical 1000 MW pressurized water reactor (PWR). A continuous release of the FPs from the reactor pressure vessel (RPV) has been implemented with coolant retention. The in-containment FP behavior is influenced by containment atmosphere and containment safety systems. The sensitivity analysis and removal rate of airborne isotopes with the containment spray system have been studied for various spray activation time, spray failure time, droplet size and spray pH value. The droplet size and pH value of the spray system effectively remove the airborne isotopes. The alkaline (sodium thiosulfate, Na 2 S 2 O 3) spray solution and spray with pH 9.5 have similar scrubbing properties for iodine. However, the removal rate from the containment spray system has been found an approximately inverse square of droplet diameter (1/d 2).

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LWR severe accident simulation: Iodine behaviour in FPT2 experiment and advances on containment iodine chemistry

Cited by 20 publications

References 55 publications

Box modelling of gas-phase atmospheric iodine chemical reactivity in case of a nuclear accident

Box modelling of gas-phase atmospheric iodine chemical reactivity in case of a nuclear accident

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

Numerical Simulation of Fission Product Behavior Inside the Reactor Containment Building Using MATLAB

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