The Reactor Core Neutronic model for the Pebble Bed Modular Reactor

Dudley, T.E.; Villiers, Piet de; Bouwer, Werner; Tsaoi, Oliver; Mulder, Eben

doi:10.1016/j.nucengdes.2007.12.027

Cited by 6 publications

(4 citation statements)

References 1 publication

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…The parameters that should be concluded are the radial power distribution, axial power distribution and coolant density profile in the fuel channels of the reactor core design. [2] III. THERMAL HYDRAULIC MODEL…”

Section: Neutronic Modelmentioning

confidence: 99%

“…Reactor core neutronic model provides the power generated in the fuel in the form of heat flux value to the reactor core thermal hydraulic model. [2] Figure. COUPLING METHODOLOGIES Three dimensional (3D) modeling of reactor core gives the realistic description of the simulation of the nuclear power plant accidents conditions and the operational flexibilities which can be improved by utilizing neutronics/thermal hydraulic calculations for safety margin.…”

Section: Neutronic Modelmentioning

confidence: 99%

See 1 more Smart Citation

Neutronics and Thermal Hydraulic Coupling Methods for the Nuclear Reactor Core

Ud-Din¹,

Peng²,

Zubair³

2011

2011 Asia-Pacific Power and Energy Engineering Conference

View full text Add to dashboard Cite

In this paper an overview of the coupling methodologies between reactor physics (Neutronics) and thermal hydraulic have been studied by taken into account the previous and ongoing research. The current study includes the neutronics and thermal hydraulic model and the coupling methodology between the two phenomenons which is inter related with computational approach. Since the coupling involves some computer codes which exchanges the data between the neutronics and thermal hydraulic so in this paper possible computer codes are also have been listed with their categories. Finally the advantages of the coupling are described with some suggestions and conclusion is also given.

show abstract

Section: Neutronic Modelmentioning

confidence: 99%

Section: Neutronic Modelmentioning

confidence: 99%

Neutronics and Thermal Hydraulic Coupling Methods for the Nuclear Reactor Core

Ud-Din¹,

Peng²,

Zubair³

2011

2011 Asia-Pacific Power and Energy Engineering Conference

View full text Add to dashboard Cite

show abstract

“…Akan tetapi penggunaan turbin uap memungkinkan terjadinya kecelakaan water ingress. Hasil studi sebelumnya mendemonstrasikan RGTT200K dapat didesain dengan koefisien reaktivitas negatif [5] dan analisis water ingress di teras RGTT200K juga telah dilakukan dengan kesimpulan perubahan reaktivitas positif terjadi untuk teras dengan bahan bakar pebble mengandung lebih dari 10.000 partikel TRISO per pebble [6] [9] dan HTR-10 Cina dengan geometri dan dimensi yang serupa dengan reaktor modular pebble bed (pebble bed modular reactor, PBMR) [10] Afrika Selatan. Setiap bahan bakar pebble (diameter 6 cm) terdiri dari bola matriks grafit berdiameter 5 cm yang diisi oleh 15.000 partikel berlapis TRISO dan shell grafit yang bebas dari bahan bakar dengan ketebalan 0,5 cm.…”

Section: Pendahuluanunclassified

Analisis Efek Kecelakaan Water Ingress Terhadap Reaktivitas Doppler Teras Rgtt200k

Zuhair

Suwoto

2015

Tri Dasa Mega

View full text Add to dashboard Cite

Dalam high temperature reactor, koefisien reaktivitas temperatur yang didesain negatif menjamin reaksi fisi dalam teras tetap berada di bawah kendali dan panas peluruhan tidak akan pernah melelehkan bahan bakar yang menyebabkan terlepasnya zat radioaktif ke lingkungan. Namun masuknya air (water ingress) ke dalam teras reaktor akibat pecahnya tabung penukar panas generator uap, yang dikenal sebagai salah satu kecelakaan dasar desain, dapat mengintroduksi reaktivitas positif dengan potensi bahaya lainnya seperti korosi grafit dan kerusakan material struktur reflektor. Makalah ini akan menganalisis efek kecelakaan water ingress terhadap reaktivitas Doppler teras RGTT200K. Kapabilitas koefisien reaktivitas Doppler untuk mengkompensasi reaktivitas positif yang timbul selama kecelakaan water ingress akan diuji melalui serangkaian perhitungan dengan program MCNPX dan pustaka ENDF/B-VII untuk perubahan temperatur bahan bakar dari 800K hingga 1800K. Tiga opsi kernel bahan bakar UO2, ThO2/UO2 dan PuO2 dengan tiga model kisi bahan bakar pebble di teras reaktor diterapkan untuk kondisi water ingress dengan densitas air dari 0 hingga 1.000 kg/m3. Hasil perhitungan memperlihatkan koefisien reaktivitas Doppler tetap negatif untuk seluruh opsi bahan bakar yang dipertimbangkan bahkan untuk posibilitas water ingress yang besar. Efek water ingress lebih kuat pada model kisi dengan fraksi packing lebih rendah karena lebih banyak volume yang tersedia untuk air yang memasuki teras reaktor. Efek water ingress juga lebih kuat di teras uranium dibandingkan teras thorium dan plutonium sebagai konsekuensi dari fenomena Doppler dimana absorpsi neutron di daerah resonansi 238U lebih besar daripada 232Th dan 240Pu. Secara keseluruhan dapat disimpulkan bahwa, koefisien Doppler teras RGTT200K mampu mengkompensasi insersi reaktivitas yang diintroduksi oleh kecelakaan water ingress. Teras RGTT200K dengan bahan bakar UO2, ThO2/UO2 dan PuO2 dapat mempertahankan fitur keselamatan melekat dengan cara pasif. Kata kunci: Water ingress, reaktivitas Doppler, RGTT200K In high temperature reactor, the negative temperature reactivity coefficient guarantees fission reaction in the core remain under the control and decay heat will not melt the fuel which cause the release of radioactive substances into the environment. But the entry of water (water ingress) into the reactor core due to rupture of a steam generator tube heat exchanger, which is known as one of the design basis accidents, can introduce positive reactivity with other potential hazards such as graphite corrosion and damage of the reflector structure material. This paper will investigate the effect of water ingress accident on Doppler reactivity coefficient of RGTT200K core. The capability of the Doppler reactivity coefficient to compensate positive reactivity incurred during water ingress accident will be examined through a series of calculations with MCNPX code and ENDF/B-VII library for fuel temperature changes from 800K to 1800K. Three options of UO2, ThO2/UO2 and PuO2 fuel kernels with three lattice models of fuel pebble in the reactor core was applied for condition of water ingress with water density from 0 to 1000 kg/m3. The results of the calculations show that Doppler reactivity coefficient is negative for the entire fuel options being considered even for a large possibility of water ingress. The effects of water ingress becomes stronger in lattice model with lower packing fraction because more volume available for water entering the reactor core. The effect of water ingress is also stronger in the uranium core compared to thorium and plutonium cores as a consequence of the Doppler phenomenon where the neutron absorption in resonance region of 238U is greater than 232Th and 240Pu. It can be concluded overall that Doppler coefficient of RGTT200K core has capability to compensate the reactivity insertion introduced by water ingress accident. RGTT200K core with UO2, ThO2/UO2 and PuO2 fuels can maintain the inherently safety features in a passive way. Keywords: Water ingress, Doppler reactivity, RGTT200K

show abstract

“…The geometry and composition detail come from [26] and are shown in Figure 26 below. Full-core PBMR cases were also run with the pebbles modeled as a lattice and with different fuel pebble models (e.g., semi-random).…”

Section: Simulation Of Pebble Bed Reactormentioning

confidence: 99%

An Advanced Neutronic Analysis Toolkit with Inline Monte Carlo capability for BHTR Analysis

Martin¹,

Lee²

2009

View full text Add to dashboard Cite

The Reactor Core Neutronic model for the Pebble Bed Modular Reactor

Cited by 6 publications

References 1 publication

Neutronics and Thermal Hydraulic Coupling Methods for the Nuclear Reactor Core

Neutronics and Thermal Hydraulic Coupling Methods for the Nuclear Reactor Core

Analisis Efek Kecelakaan Water Ingress Terhadap Reaktivitas Doppler Teras Rgtt200k

An Advanced Neutronic Analysis Toolkit with Inline Monte Carlo capability for BHTR Analysis

Contact Info

Product

Resources

About