Numerical simulation of a potential CO2 ingress accident in a SFR employing an advanced energy conversion system

Eoh, Jaehyuk; Jeong, Ji-Young; Han, Jeongho; Kim, Seong-O

doi:10.1016/j.anucene.2008.09.012

Cited by 12 publications

(16 citation statements)

References 2 publications

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“…4,5) The total amount of CO generation increased remarkably as the sodium temperature rose above 500 C, and its concentration reached 3 vol% in the CO/CO 2 mixture gas. Under the same temperature conditions, a higher CO concentration of 6 vol% was observed as the nozzle size was enlarged.…”

Section: (3) Results and Discussionmentioning

confidence: 99%

“…Since the chemical reaction between sodium and CO 2 is relatively mild below a sodium temperature of 450-500 C, 3,4) the shape and size of the reaction products are very different depending on the sodium temperature. Thus, the kinetic features of solid reaction product formation would also affect nozzle plugging.…”

Section: (3) Results and Discussionmentioning

confidence: 99%

“…In general, the sodium-CO 2 interaction has strong temperature dependence, and its kinetics abruptly changes at a threshold temperature of approximately 450-500 C. 3,4) To this end, the possibility of channel plugging was preliminarily estimated for these two bounded Wastage and Self-Plugging by a Potential CO 2 Ingress in a Supercritical CO 2 Power Conversion System of an SFR design conditions. The CO 2 injection pressure was set around 5.5 MPa as in the wastage test.…”

Section: Results Of High-pressure Co 2 Injectionmentioning

confidence: 99%

“…Since this feature was totally dependent on the reaction temperature, 3,4) the combined corrosion/erosion effect on the structure surface was investigated with respect to the sodium temperatures. Figure 8 shows the post-test views of the target surfaces after the cleaning of each target specimen.…”

Section: (3) Results and Discussionmentioning

confidence: 99%

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Wastage and Self-Plugging by a Potential CO₂Ingress in a Supercritical CO₂Power Conversion System of an SFR

Eoh

Yoo

et al. 2010

Journal of Nuclear Science and Technology

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For a CO 2 ingress accident into liquid sodium in a supercritical CO 2 power conversion system coupled with a sodium-cooled fast reactor, we investigated two major design issues: i) a wastage phenomenon in regard to structural damage adjacent to the leaking position, and ii) potential channel plugging due to the formation of a particulate reaction product. In order to understand the factors affecting the occurrence of these issues, two kinds of experiments were carried out: a wastage effect test and a self-plugging test. All experimental conditions were chosen to reasonably represent the normal operating conditions and realistic design parameters of the reference plant. The test results indicate the absence of wastage, which will not lead to additional tube ruptures and damage propagation. In the current experiment, the self-plugging of PCHE channels only took place under two limited conditions: i) the sodium temperature is over 500 C and ii) the equivalent diameter of the crack opening is less than 1.5 mm with a small leakage rate of far less than 1 g/s of CO 2 ingress.

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Section: (3) Results and Discussionmentioning

confidence: 99%

Section: (3) Results and Discussionmentioning

confidence: 99%

Section: Results Of High-pressure Co 2 Injectionmentioning

confidence: 99%

Section: (3) Results and Discussionmentioning

confidence: 99%

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Wastage and Self-Plugging by a Potential CO₂Ingress in a Supercritical CO₂Power Conversion System of an SFR

Eoh

Yoo

et al. 2010

Journal of Nuclear Science and Technology

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“…In addition to its high thermal efficiency and its potential compactness of the heat-exchanger system with the S-CO 2 Brayton cycle [9,10], it can be a safer system than conventional SFR SGs. A sodium-CO 2 reaction is claimed to be milder than an SWR [10][11][12]. Referring to [13], the liquid sodium and CO 2 gas is categorized as a rate-controlled process, because its reaction rate strongly depends on the reaction condition, and the chemical reaction speed between sodium and CO 2 gas is consequently much slower than that of an SWR.…”

Section: Introductionmentioning

confidence: 99%

Development of a Physics-Based Monitoring Algorithm Detecting CO2 Ingress Accidents in a Sodium-Cooled Fast Reactor

Kim

Eoh

et al. 2018

Energies

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One of the benefits of the supercritical CO 2 Brayton cycle in Sodium-cooled Fast Reactors is an enhanced plant safety, since potential reactions of CO 2 with liquid sodium have been reported to be less stringent than a sodium-water reaction found in the Rankine cycle. However, moderate chemical interactions between CO 2 and liquid sodium make detecting CO 2 ingress accidents harder. Thus, this paper proposes a new physics-based detection algorithm by comparing the real-time pressure measurements of two identical heat exchangers for the early detection. The CO 2 ingress occurs owing to a crack at the pressure boundary wall, a certain self-recovery of structural damage does not happen over time, and an accident probabilistically starts at only one component of two. The proposed physics-based method with the probabilistic analysis was compared to the pure data-based method. Finally, the damage degradation was developed with a simplified mass and energy transfer model, and the proposed algorithm was verified with experimental data. The results show that a 99.99% detection probability can be achieved for the air ingress of 30 cc/s, which is equivalent to the 0.12 g/s CO 2 ingress, in a 70 s detection time, limiting down to 0.1% false alarms due to sensor noise.

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Nuclear power

Sienicki

Moisseytsev

2017

Fundamentals and Applications of Supercritical Carbon Dioxide (SCO2) Based Power Cycles

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Numerical simulation of a potential CO2 ingress accident in a SFR employing an advanced energy conversion system

Cited by 12 publications

References 2 publications

Wastage and Self-Plugging by a Potential CO₂Ingress in a Supercritical CO₂Power Conversion System of an SFR

Wastage and Self-Plugging by a Potential CO₂Ingress in a Supercritical CO₂Power Conversion System of an SFR

Development of a Physics-Based Monitoring Algorithm Detecting CO2 Ingress Accidents in a Sodium-Cooled Fast Reactor

Nuclear power

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Numerical simulation of a potential CO2 ingress accident in a SFR employing an advanced energy conversion system

Cited by 12 publications

References 2 publications

Wastage and Self-Plugging by a Potential CO2Ingress in a Supercritical CO2Power Conversion System of an SFR

Wastage and Self-Plugging by a Potential CO2Ingress in a Supercritical CO2Power Conversion System of an SFR

Development of a Physics-Based Monitoring Algorithm Detecting CO2 Ingress Accidents in a Sodium-Cooled Fast Reactor

Nuclear power

Contact Info

Product

Resources

About

Wastage and Self-Plugging by a Potential CO₂Ingress in a Supercritical CO₂Power Conversion System of an SFR

Wastage and Self-Plugging by a Potential CO₂Ingress in a Supercritical CO₂Power Conversion System of an SFR