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Rakesh Chawla

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Related publications (141)

Comparison of the transient behaviour of LBE-and gas-cooled experimental accelerator-driven systems

The paper presents a comparison of transient calculations for two 80-MWt MOX-fuelled experimental accelerator-driven systems (XADS), one cooled by lead-bismuth eutectic and the other by helium. The results for protected (with accelerator beam trip) and unp ...

Elsevier2006

Reactivity and neutron emission measurements of highly burnt PWR fuel rod samples

Rakesh Chawla, Fabian Jatuff

Fuel rods with burnup values beyond 50GWd/t are characterised by relatively large amounts of fission products and a high abundance of major and minor actinides. Of particular interest is the change in the reactivity of the fuel as a function of burnup and ...

Elsevier2006

Modelling the CABRI high-burnup RIA test CIP0-1 using an extended version of the FALCON code

Rakesh Chawla

An improved version of the FALCON fuel performance code is used to model the thermal-mechanical behaviour of the test rod in the CABRI high-burnup RIA test CIP0-1. First, the original FALCON code (version MOD01) is modified by introducing new routines yiel ...

Elsevier2006

Calculations on fission gas behaviour in the high burnup structure

Rakesh Chawla, Paul Blair

The behaviour of fission gas in high burnup fuel during steady-state and transient conditions is of special interest for safety reasons. Despite this, mechanistic models that reflect the fission gas transport processes and reliably predict the evolution of ...

Elsevier2006

Experimental validation of channel bowing effects on pin power distributions in a Westinghouse SVEA-96+ assembly

Rakesh Chawla, Tony Williams, Fabian Jatuff

Effects of channel bowing on the pin power and 238U capture rate distributions have been studied experimentally and analytically in a test zone consisting of 9 full-size Westinghouse Atom SVEA-96+ fuel assemblies in the PRO-TEUS critical facility. A very s ...

Atomic Energy Society of Japan2006

A benchmark on the calculation of kinetic parameters based on reactivity effect experiments in the CROCUS reactor

Rakesh Chawla

Measurements in the CROCUS reactor at EPFL, Lausanne, are reported for the critical water level and the inverse reactor period for several different sets of delayed supercritical conditions. The experimental configurations were also calculated by four diff ...

Elsevier2006

Comparisons of deterministic neutronic calculations with Monte Carlo results for an advanced BWR fuel assembly with hafnium control blades

Michaël Plaschy, Rakesh Chawla, Fabian Jatuff, Filippo Tani, Flavio Dante Giust

From the neutronic viewpoint, the optimization of BWR core designs is strongly related to the accurate determination of flux variations inside and around fuel assemblies. These fluctuations, which are mainly due to the high heterogeneity of the fuel and mo ...

Atomic Energy Society of Japan2006

Isobaric production cross sections from 0.6 GeV proton irradiation of neptunium and thorium using mass spectrometry

Rakesh Chawla

A high-fluence proton irradiation of neptunium was the last experiment in PSIs programme ATHENA related to accelerator-based transmutation. The principal aim of the programme has been to provide experimental data for the validation of theoretical models in ...

Elsevier2006

Determination of adjusted neutron spectra in different MUSE configurations by unfolding techniques

Michaël Plaschy, Rakesh Chawla

Investigations of spectrum adjustment by unfolding techniques for different locations of critical and driven subcritical MUSE4 configurations are presented. The current analysis is based on the recent accomplishment of specific foil activation measurements ...

American Society for Testing and Materials2006

On the accuracy of reactor physics calculations for square HPLWR fuel assemblies

Rakesh Chawla, Fabian Jatuff

Although the supercritical-pressure or high-performance light water reactor (HPLWR) concept is largely based on the well-established technological experience available with conventional light water reactors, there is still no consensus on various key desig ...

Elsevier2006

Effects of void uncertainties on the void reactivity coefficient and pin power distributions for a 1010 BWR assembly

Rakesh Chawla, Fabian Jatuff, Flavio Dante Giust

An important source of uncertainty in boiling water reactor physics is associated with the precise characterisation of the moderation properties of the coolant and by-pass regions, with significant impact on reactor physics parameters such as the lattice n ...

Elsevier2006

Real-Time Treatment Planning Optimisation for Brachytherapy

Rakesh Chawla, Jean-Philippe Thiran

In this paper, we present an integrated system for real-time dose distribution calculation and treatment planning optimisation for brachytherapy of prostate cancer, with a special emphasis on the visual integration of the dosimetry and target images obtain ...

2005

Development of a drift-flux model for heavy liquid metal/gas flow

Rakesh Chawla, Konstantin Mikityuk

The gas lift pump concept based on the bubbling of an inert gas into the primary reactor coolant to enhance natural circulation is currently considered in a number of PbBi-cooled reactor concepts. Thus, the analysis of available void fraction data and the ...

Atomic Energy Society of Japan2005

Within-pin reaction rate distributions: CASMO-4 and HELIOS compared against tomographic measurements at the PROTEUS reactor

Rakesh Chawla, Fabian Jatuff

In the framework of the LWR-PROTEUS project - an extended validation program for advanced light water reactor core analysis tools conducted at the Paul Scherrer Institute - the radial, internal variations of the total fission rate (Ftot) and the capture ra ...

American Nuclear Society2005

Investigation of ADS-Type heterogeneities in the MUSE4 critical configuration

Michaël Plaschy, Rakesh Chawla, Gérald Rimpault

The MUSE4 programme of ADS-related integral experiments has recently been completed at the MASURCA facility at Cadarache (France). Investigations have been carried out in a reference critical fast-spectrum configuration and related sub-critical core config ...

Atomic Energy Society of Japan2005

Semi-analytical bifurcation analysis of two-phase flow in a heated channel

Rakesh Chawla, Abdelhamid Dokhane

Using a drift flux representation for the two-phase flow, a new reduced order model has been developed to simulate density-wave oscillations (DWOs) in a heated channel. This model is then used to perform stability and semi-analytical bifurcation analysis, ...

World Scientific Publishing2005

Importance of the MUSE experiments for emerging ADS concepts from the nuclear data viewpoint

Michaël Plaschy, Rakesh Chawla, Gérald Rimpault

The current investigation, conducted in the general framework of the MUSE program ("MUltiplication avec une Source Externe"), considers the representativity of a specific configuration of its fourth phase (M4SC2), which is driven by an external D(d,n)He3 o ...

Elsevier2005

FAST: An advanced code system for fast reactor transient analysis

Rakesh Chawla, Konstantin Mikityuk

One of the main goals of the FAST project at PSI is to establish a unique analytical code capability for the core and safety analysis of advanced critical (and sub-critical) fast-spectrum systems for a wide range of different coolants. Both static and tran ...

Elsevier2005

144Ce as a potential candidate for interstitial and intravascular brachytherapy

Rakesh Chawla, François Bochud

To investigate the suitability of 144Ce for both interstitial and intravascular brachytherapy applications. Monte Carlo calculations of radial dose rate distributions in water were performed for 144Ce in a spring-shaped source and compared with two commonl ...

Elsevier2005

Calculation of multiple-scattering angular distributions of electrons and positrons

Rakesh Chawla, Cezarina Elena Negreanu

A robust numerical algorithm for the calculation of multiple-scattering angular distributions of high-energy electrons and positrons is described. This algorithm implements the multiple-scattering theories of Goudsmit-Saunderson, which disregards energy lo ...

Elsevier Ltd2005

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