Effect of Spray System on Fission Product Distribution in Containment During a Severe Accident in a Two-Loop Pressurized Water Reactor

Dehjourian, Mehdi; Rahgoshay, Mohammad; Sayareh, Reza; Jahanfarnia, Gholamreza; Shirani, Amir Saied

doi:10.1016/j.net.2016.03.007

Cited by 9 publications

(5 citation statements)

References 3 publications

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“…These will readily leave the plant in the absence of restrictions installed in the plant. Hence, many countries have implemented restrictions such as containment spray systems and filtered containment venting systems in their nuclear power plants . These systems depressurize the containment and remove almost all airborne radioactive substances .…”

Section: Introductionmentioning

confidence: 99%

“…Hence, many countries have implemented restrictions such as containment spray systems and filtered containment venting systems in their nuclear power plants . These systems depressurize the containment and remove almost all airborne radioactive substances . Thus, they play important roles in mitigating accident consequences by acting against the release of radioactivity to the environment.…”

Section: Introductionmentioning

confidence: 99%

“…Among the numerous radioactive species, the iodine‐based species can predominantly contribute to the atmosphere radioactivity in the early stages of an accident, as implied from the consequences of the Chernobyl nuclear accident . The systems mentioned above can remove almost all of the iodine species such as cesium iodide (CsI), molecular iodine (I 2 ), and methyl iodide (CH 3 I) into water (aqueous solutions) . However, iodine can be released back into the atmosphere due to the subsequent formation of volatile species ( e.g ., I 2 and CH 3 I) under irradiation conditions .…”

Section: Introductionmentioning

confidence: 99%

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Concentration Determination of Volatile Molecular Iodine and Methyl Iodide

Kim

et al. 2018

Bulletin Korean Chem Soc

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Appropriate and reliable methods are necessary for routine determination of the concentrations of molecular iodine (I 2 ) and methyl iodide (CH 3 I), and methods including ultraviolet-visible spectrophotometry on aqueous solution samples for I 2 detection and gas chromatography on toluene solution samples for CH 3 I detection may be used. In this study, we examined the adequacy of the existing spectrophotometric method in terms of absorption coefficients at specific light wavelengths for several pH values of the aqueous solutions and selected iodide ion concentrations, and confirmed it finding no dependence of the absorption coefficients on the solution pH and the iodide ion concentration. Additionally, we established methods for CH 3 I analysis using toluene as a sampling solvent for either capture of CH 3 I from a gaseous solution or extraction of CH 3 I from an aqueous solution, and found that using gas-tight syringes, CH 3 I could be extracted without a significant CH 3 I loss even at ambient temperature.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Concentration Determination of Volatile Molecular Iodine and Methyl Iodide

Kim

et al. 2018

Bulletin Korean Chem Soc

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“…The spray system is automatically activated with the initiation of the accident [1]. During an accident in a PWR, the in-containment spray system is used to prevent the containment overpressurization, to enhance the gas mixing, and to wash out fission products.…”

Section: Introductionmentioning

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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“…The containment spray system is significant in enhancing the early depletion of radionuclides during early in-vessel release phase from the containment atmosphere. The spray system is automatically activated, as an emergency designed device to prevent containment integrity [9].…”

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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Effect of Spray System on Fission Product Distribution in Containment During a Severe Accident in a Two-Loop Pressurized Water Reactor

Cited by 9 publications

References 3 publications

Concentration Determination of Volatile Molecular Iodine and Methyl Iodide

Concentration Determination of Volatile Molecular Iodine and Methyl Iodide

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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