Multiphysics modeling of porous CRUD deposits in nuclear reactors

Short, Michael P.; Hussey, Dennis; Kendrick, Brian K.; Besmann, Theodore M.; Stanek, Christopher R.; Yip, Sidney

doi:10.1016/j.jnucmat.2013.08.014

Cited by 60 publications

(17 citation statements)

References 19 publications

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“…[11] Mesoscale CRUD models under development within the CASL program (Consortium for Advanced Simulation of Light Water Reactors) assume precipitation of boron oxide (B2O3) as a possible B deposition mechanism in the porous CRUD. [12] 3 Although current research is moving toward a better description of CRUD properties and its behavior in PWRs, more work is needed to elucidate the mechanisms through which B or boron-containing solids are deposited on the fuel rods. In this work we carry out electronic structure calculations to investigate the possibility of B incorporation into crystalline NFO.…”

Section: Introductionmentioning

confidence: 99%

First-principles investigation of boron defects in nickel ferrite spinel

Rak

O’Brien

Brenner

2014

Journal of Nuclear Materials

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Section: Introductionmentioning

confidence: 99%

First-principles investigation of boron defects in nickel ferrite spinel

Rak

O’Brien

Brenner

2014

Journal of Nuclear Materials

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“…The integration times for the complete and fast component were 140 ns and 30 ns, respectively. In the pulse gradient method, values ranging within [15,25] ns are believed to be optimal. Based on our studies, the value was set to be 22 ns and the threshold of the pulse height was set to be 0.5.…”

Section: Comparisons and Discussion 1) Influence Of High Frequency Noisementioning

confidence: 99%

Toward a fractal spectrum approach for neutron and gamma pulse shape discrimination

刘明哲¹,

刘炳琦²,

左卓³

et al. 2016

Chinese Phys. C

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Accurately selecting neutron signals and discriminating gamma signals from a mixed radiation field is a key research issue in neutron detection. This paper proposes a fractal spectrum discrimination approach by means of different spectral characteristics of neutrons and gamma rays. Figure of merit and average discriminant error ratio are used together to evaluate the discrimination effects. Different neutron and gamma signals with various noise and pulse pile-up are simulated according to real data in the literature. The proposed approach is compared with the digital charge integration and pulse gradient methods. It is found that the fractal approach exhibits the best discrimination performance, followed by the digital charge integration method and the pulse gradient method, respectively. The fractal spectrum approach is not sensitive to high frequency noise and pulse pile-up. This means that the proposed approach has superior performance for effective and efficient anti-noise and high discrimination in neutron detection.

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“…Water is absorbed into the deposit by capillary suction, evaporates into steam at the "mouth" of the chimney, and finally disappears in the coolant as steam bubbles. Upon the recent years, researchers have built upon this concept and developed it into different crud calculation models [5][6][7][8][9][10][11]. In the experimental research, scientists observed the fractalline properties of PWR fuel crud [12] and then found that a systematic theory of fractal porous media [13] can be used to refine some parameters and assumptions in the crud model.…”

Section: Introductionmentioning

confidence: 99%

A Combined Method for Predicting the Boron Deposited Mass and the CIPS Risk

Yang

Zhang

et al. 2019

Science and Technology of Nuclear Installations

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CIPS is a shift in the axial power towards the bottom half of the core, also known as axial offset anomaly (AOA), which results from the deposited of corrosion products during an operation. The main reason of CIPS is the solute particles especially boron compounds concentrated inside the porous deposit. The impact of CIPS is that the axial power distribution control may be more difficult and the shutdown margin can be decreased simultaneously. Besides, it also requires estimated critical condition (ECC) calculations to account for the effects of AOA. In this article, thermal-hydraulic subchannel code and boron deposit model have been combined to analyze the CIPS risk. The neutronics codes deal with the generation of homogenized neutron cross section as well as the calculation of local power factor. A simple rod assembly is analyzed with this combined method and simulation results are presented. Simulation results provide the boron hideout amount inside crud deposits and power shapes. The obtained results clearly show the power shape suppression in regions where crud deposits exist, which is a clear indication of CIPS phenomenon. And the CIPS effects on CHF have also been investigated. Result shows a margin of DNBR decrease in the crud case.

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Multiphysics modeling of porous CRUD deposits in nuclear reactors

Cited by 60 publications

References 19 publications

First-principles investigation of boron defects in nickel ferrite spinel

First-principles investigation of boron defects in nickel ferrite spinel

Toward a fractal spectrum approach for neutron and gamma pulse shape discrimination

A Combined Method for Predicting the Boron Deposited Mass and the CIPS Risk

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