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Bachchan Abhitab,Hazra Puspendu,Sundaram Nimala,Kirtan Subhadip,Chaudhary Nakul,Riyas A.,Devan K. 한국원자력학회 2023 Nuclear Engineering and Technology Vol.55 No.10
The early localization of a fuel subassembly with a failed (wet rupture) fuel pin is very important in reactors to limit the associated radiological and operational consequences. This requires a fast and reliable system for failure detection and their localization in the core. In the Prototype Fast Breeder Reactor, the system specially designed for this purpose is Failed Fuel Location Modules (FFLM) housed in the control plug region. It identifies a failed sub-assembly by detecting the presence of delayed neutrons in the sodium from a failed sub-assembly. During the commissioning phase of PFBR, it is mandatory to demonstrate the FFLM effectiveness. The paper highlights the engineering and physics design aspects of FFLM and the integrated simulation towards its function demonstration with a source assembly containing a perforated metallic fuel pin. This test pin mimics a MOX pin of 1 cm2 of geometrical defect area. At 10% power and 20% sodium flow rate, the counts rate in the BCCs of FFLM system range from 75 cps to 145 cps depending upon the position of DN source assembly. The model developed for the counts simulation is applicable to both metal and MOX pins with proper values of k-factor and escape coefficient.
Photo-Neutrons Produced at the Pohang Neutron Facility Based on an Electron Linac
K. Devan,김귀년,A. K. M. M. H. Meaze,Duc Khue Pham,Duc Thiep Tran,강흥식,고인수,조무현,Van Do Nguyen,Van Duan Phung,남궁원,이영석 한국물리학회 2006 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.49 No.1
The Pohang Neutron Facility based on an electron linac was operated for total neutron crosssection measurements by using the pulsed neutrons produced in a water-cooled Ta-target with a water moderator. We investigated the photo-neutrons produced in the water-cooled Ta-target system by using the Monte-Carlo simulation code MCNPX, version 2.5e, and the results were checked with the experimental values. The optimum conditions of the target system and the experimental setup to maximize the thermal neutron production were investigated.
A.K.M. Moinul Haque MEAZE,김귀년,손동철,강행식,고인수,K. DEVAN,유건중,Mayeen Uddin KHANDAKER,조무현,남궁원,이영석,김영애,이영욱 한국물리학회 2006 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.48 No.4
The neutron total cross-sections of tantalum (181Ta) were measured in the neutron energy region from 0.01 eV to 100 eV by using the time-of-flight method at the Pohang Neutron Facility, which consists of an electron linac, a water-cooled tantalum target with a water moderator, and a 12-mlong time-of-flight path. A 6Li-ZnS(Ag) scintillator with a diameter of 12.5 cm and a thickness of 1.6 cm was used as a neutron detector, and a natural tantalum metal plate, 10 × 10 cm2 in area by 0.45 mm in thickness, was used for the neutron transmission measurement. The background level was determined by using a notch-filter of Co, In, and Cd sheets. The present measurement was compared with the previous ones and the evaluated data in ENDF/B-VI.8. The resonance parameters of 181Ta isotope were obtained from the transmission ratio by using the SAMMY code, which utilizes both Doppler and resolution broadening effects and Bayes’ generalized least squares technique.
Chemically synthesized PbS Nano particulate thin films for a rapid NO<sub>2</sub> gas sensor
Burungale, Vishal V.,Devan, Rupesh S.,Pawar, Sachin A.,Harale, Namdev S.,Patil, Vithoba L.,Rao, V. K.,Ma, Yuan-Ron,Eun Ae, Jo,Kim, Jin H.,Patil, Pramod S. De Gruyter 2016 MATERIALS SCIENCE -WROCLAW- Vol.34 No.1
<P><B>Abstract</B></P><P>Rapid NO<SUB>2</SUB>gas sensor has been developed based on PbS nanoparticulate thin films synthesized by Successive Ionic Layer Adsorption and Reaction (SILAR) method at different precursor concentrations. The structural and morphological properties were investigated by means of X-ray diffraction and field emission scanning electron microscope. NO<SUB>2</SUB>gas sensing properties of PbS thin films deposited at different concentrations were tested. PbS film with 0.25 M precursor concentration showed the highest sensitivity. In order to optimize the operating temperature, the sensitivity of the sensor to 50 ppm NO<SUB>2</SUB>gas was measured at different operating temperatures, from 50 to 200<SUP>°</SUP>C. The gas sensitivity increased with an increase in operating temperature and achieved the maximum value at 150<SUP>°</SUP>C, followed by a decrease in sensitivity with further increase of the operating temperature. The sensitivity was about 35 % for 50 ppm NO<SUB>2</SUB>at 150<SUP>°</SUP>C with rapid response time of 6 s. T90 and T10 recovery time was 97 s at this gas concentration.</P>
Bhat, T. S.,Vanalakar, S. A.,Devan, R. S.,Mali, S. S.,Pawar, S. A.,Ma, Y. R.,Hong, C. K.,Kim, J. H.,Patil, P. S. Springer Science + Business Media 2016 Journal of materials science Materials in electron Vol.27 No.5
<P>Thin films of Lead Selenide (PbSe) having compact nanoarchitectures were synthesized by a facile and cost-efficient successive ionic layer adsorption and reaction (SILAR) technique. The structural, morphological, optical and compositional properties were studied using X-ray diffraction (XRD), Field emission scanning electron microscopy (FESEM), Transmission electron microscopy (TEM), UV-vis spectrophotometer, and X-ray photoelectron spectroscopy (XPS) techniques. Moreover, the effect of SILAR cycles on the morphology of PbSe thin films was investigated. XRD patterns revealed the formation of crystalline PbSe with the cubic crystal structure. FESEM images show shape evolution from nanoparticulate to merged pyramidal-like structure with variation in size from similar to 200 to 430 nm. The optical direct band gap energy of PbSe were varies from 1.32 to 1.20 eV with the increase in deposition cycles. The HRTEM and SAED results show the crystalline nature of the sample which is in good agreement with the XRD. The electrical characterizations were performed in order to obtain the ohmic behavior in the metal-semiconductor interface. The deposited thin films show a good ohmic behavior.</P>
Patil, D.S.,Pawar, S.A.,Devan, R.S.,Mali, S.S.,Gang, M.G.,Ma, Y.R.,Hong, C.K.,Kim, J.H.,Patil, P.S. Elsevier Sequoia 2014 Journal of electroanalytical chemistry Vol.724 No.-
The composite thin films of Silver-activated carbon/polyaniline (Ag-AC/PANI) have been deposited on stainless steel substrates by a facile dip coating technique. The formation of Ag-AC/PANI electrode is analyzed by Fourier transform infrared, Fourier transform-Raman and X-ray photoelectron spectroscopy techniques. Field Emission Scanning Electron Microscopy revealed the presence of Ag nanoparticles on the porous spongy background of PANI. The highest specific capacitance of 567Fg<SUP>-1</SUP>at 5mVs<SUP>-1</SUP> and energy density of 86.30Whkg<SUP>-1</SUP> at 1mAcm<SUP>-2</SUP> is observed for the Ag-AC/PANI indicating positive synergistic effect of silver, activated carbon and PANI. In which silver nanoparticles help in improving the electronic conductivity and activated carbon enhances the electrochemical stability of the PANI electrodes.
Van Do Nguyen,김귀년,A.K.M. Moinul Haque MEAZE,Duc Khue Pham,Duc Thiep Tran,이희석,고인수,K. DEVAN,조무현,Van Duan Phung,남궁원,이영석 한국물리학회 2006 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.48 No.3
The Pohang Neutron Facility, which consists of an electron linear accelerator, a water-cooled Ta target with a water moderator, and a time-of-flight path with an 11-m length, was constructed to measure neutron total cross-sections in the neutron energy region from thermal to several hundreds of eV by using the time-of-flight method. In order to utilize this pulsed neutron facility based on an electron linac, we have to understand the characteristics of the radiation fields produced in this facility. We used the multiple-foil activation method to measure the neutron and the photon distributions produced by a water-cooled Ta target with and without the water moderator./?P믭
Pawar, S.A.,Patil, D.S.,Patil, S.K.,Awale, D.V.,Devan, R.S.,Ma, Y.R.,Kolekar, S.S.,Kim, J.H.,Patil, P.S. Pergamon Press 2014 ELECTROCHIMICA ACTA Vol.148 No.-
A thiocyanate functionalized ionic liquid based electrolyte is developed for the application in CdSe thin film solar cell. An aqueous solvent consisting of polysulfide and thiocyanate functionalized IL has been found as the optimum solvent for preparing the liquid electrolytes. This solvent ratio appears to give higher cell efficiency compared to pure aqueous polysulfide electrolyte. Polysulfide and thiocyanate functionalized IL give rise to a good redox couple in the electrolyte for photoelectrochemical performance. The CdSe photoanode used for solar cell study has been synthesized by a simple and cost-effective one-step, one-pot chemical bath deposition method onto the F: SnO<SUB>2</SUB> substrates. The as-deposited films were annealed at temperatures 100, 200, 300 and 400<SUP>o</SUP>C, respectively for 1h in ambient air. The maximum current density of 3.55mA/cm<SUP>2</SUP> for the sample annealed at 300<SUP>o</SUP>C is observed in the polysulfide electrolyte with the power conversion efficiency 0.76%. Addition of thiocyanate functionalized IL in polysulfide produced the highest current density of 4.93mA/cm<SUP>2</SUP> with the two fold increase in the power conversion efficiency up to 1.32%.