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Investigation of ex-vessel core catcher for SBO accident in VVER-1000/V528 containment using MELCOR code

Nuclear Science and Techniques 2021年第4期32卷 92-111页

作者： Farhad Salari Ataollah Rabiee Farshad Faghihi Department of Nuclear Engineering School of Mechanical EngineeringShiraz UniversityShiraz 71936-16548Iran Radiation research center Shiraz UniversityShirazIran ionizing and non-ionizing research center Shiraz University of Medical ScienceShirazIran

To mitigate consequences of core melting,an ex-vessel core catcher is investigated in this *** should be obeyed to cool down the corium caused by core *** corium destroys the reactor containment and causes radioactive materials to be released into the environment if it does not cool down *** is important to build a core catcher system for the reception,localization,and cool down of the molten corium during a severe accident resulting from core *** this study,the role of a core catcher in the VVER-1000/v528 reactor containment during a station black out(SBO)accident is evaluated using the MELCOR1.8.6 *** addition,parametric analyses of the SBO for(i)SBO accidents with emergency core cooling system(ECCS)operation,and(ii)without ECCS operation are ***,thermal–hydraulic analyses in dry and wet cavities with/without water are *** investigations include the reduction of gases resulting from molten–corium–concrete interactions(H_(2),CO,CO_(2)).Core melting,gas production,and the pressure/temperature in the reactor containment are ***,a full investigation pertaining to gas release(H_(2),CO,CO_(2))and the pressure/temperature of the core catcher is *** on MELCOR simulations,a core cavity and a perimeter water channel are the best options for corium cooling and a lower radionuclide *** simulation is also theoretically investigated and discussed *** simulation results show that the core catcher system in addition to an internal sacrificial material reduces the containment pressure from 689 to 580 kPa and the corresponding temperature from 394 to 380 ***,it is observed that the amount of gases produced,particularly hydrogen,decreased from 1698 to 1235 ***,the presence of supporting systems,including an ECCS with a core catcher,prolonged the core melting time from 16,430 to 28,630 s(in an SBO accident)and significantly decreased the gases produced.

关键词： Core catcher VVER-1000/V528 Containment SBO accident MELCOR Environmental radionuclide release Corium cooling

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Effects of long-term exposure to radiofrequency radiations emitted by mobile Jammers on reproduction parameters in rats

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Asian pacific Journal of Reproduction 2017年第4期6卷 164-171页

作者： Maryam Owjfard Manzarbanoo Shojaei Fard Department of Physiology Fasa University of Medical SciencesFasaIran ionizing and non-ionizing Radiation Protection research center Shiraz University of Medical SciencesShirazIran

Objective:To evaluate the effect of long-term exposure to radiofrequency radiations emitted from mobile jammers onrat's reproductive ***: Eighty male rats were divided into neonatal group (n=20), immature group (n=30) and mature group (n=30). Neonatal rats were randomly divided into two subgroups. Immature and mature rats were randomly divided into three subgroups. Experimental rats were fixed in the restraining tube and were exposed to radiofrequency radiations emitted from mobile jammers at a distance of 100 cm, for 30 d (7 h/d). Sham group rats were also fixed in restraining tube but without radiations. The control group was allowed to move freely without being exposed to radiation. At the end of the experiment, weight of testes, sperm quality, histological testicular sections and serum testosterone levels were ***: Long-term exposure to radiofrequency from mobile jammers could adversely affect neonatal rat fertility, but it did not have significant effects on male mature and immature rat's reproduction parameters. However, restraint stress induced by immobilizing them for a long-period could adversely affect male mature rat's reproductive parameters, but it had no significant effect on male immature rat's reproduction ***:The effects of EMF exposure to be various based on the life stage.

关键词： Radio frequency Mobile jammers Testicular Reproduction Rats

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Core designing of a new type of TVS-2M FAs:neutronics and thermal-hydraulics design basis limits

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Frontiers in Energy 2021年第1期15卷 256-278页

作者： Saeed GHAEMI Farshad FAGHIHI Department of Nuclear Engineering School of Mechanical EngineeringShiraz UniversityShiraz 71936-16548Iran Radiation research center Shiraz UniversityShiraz 71936Iran Lonizing and non-ionizing Radiation center Shiraz University of Medical ScienceShirazIran

One of the most important aims of this study is to improve the core of the current VVER reactors to achieve more burn-up(or more cycle length)and more intrinsic *** is an independent study on the Russian new proposed FAs,called TVS-2M,which would be applied for the future advanced *** important aspects of neutronics as well as thermal hydraulics investigations(and analysis)of the new type of Fas are conducted,and results are compared with the standards PWR *** TVS-2M FA contains gadolinium-oxide which is mixed with UO_(2)(for different Gd densities and U-235 enrichments which are given herein),but the core does not contain *** new type TVS-2M Fas are modeled by the SARCS software package to find the PMAXS format for three states of CZP and HZP as well as HFP,and then the whole core is simulated by the PARCS code to investigate transient *** addition,the WIMS-D5 code is suggested for steady core modeling including TVS-2M FAs and/or TVS *** neutronics aspects such as the first cycle length(first cycle burn up in terms of MWthd/kgU),the critical concentration of boric acid at the BOC as well as the cycle length,the axial,and radial power peaking factors,differential and integral worthy of the most reactive CPS-CRs,reactivity coefficients of the fuel,moderator,boric acid,and the under-moderation estimation of the core are conducted and benchmarked with the PWR ***,the burn-up calculations indicate that the 45.6 d increase of the first cycle length(which corresponds to 1.18 MWthd/kgU increase of burnup)is the best improving aim of the new FA type called ***,thermal-hydraulics core design criteria such as MDNBR(based on W3 correlation)and the maximum of fuel and clad temperatures(radially and axially),are investigated,and discussed based on the CDBL.

关键词： TVS-2M FAs core design basis limits VVER-1000 analysis mixture of uranium-gadolinium oxides fuels thermal-hydraulics PARCS WIMS-D5

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Biomedical Applications of DNA-Nanomaterials Based on Metallic Nanoparticles and DNA Self-Assembled Nanostructures

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Chinese Journal of Chemistry 2016年第3期34卷 283-290页

作者： Yanli Wen Lanying Li Lele Wang Li Xu Wen Liang Suzhen Ren Gang Liu Lab of Biometrology Division of Chemistry and Ionizing Radiation Measurement Technology Shanghai Institute of Measurement and Testing Technology Shanghai 201203 China

DNA is the carrier of genetic information, and its sequence can be designed to realize many important functions, including DNAzyme, aptamer and even structurally precise nanomaterials. The development of DNA nanotechnol- ogy combined functional nucleic acids with nanomaterials for various effective biomedical applications. Here, we reviewed the application of DNA-nanomaterials in two biomedical fields： early diagnosis and drug delivery. And in each field, we mainly focused on two kinds of nanomaterials： metallic nanoparticles and DNA self-assembled na- nomaterials. DNA metallic nanomaterials showed unique optical, electronic and magnetic properties in bioanalysis, and when functioned by DNA, their specificity was improved for both biosensor development and drug delivery. More recently, many DNA self-assembled nanomaterials were introduced into biomedical application for their well-defined structure and excellent biocompatibility. We summarized the research of these two kinds of DNA- nanomaterials for biomedical purposes, and finally made some prospection about their future development.

关键词： nanoparticles DNA aptamers biosensors drug delivery

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The Effects of Distance and Duration of Exposure to Electromagnetic Radiation of Hair Dryer on Rat Sperm Parameters

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Journal of Biosciences and Medicines 2020年第6期8卷 17-27页

作者： Shirin Safari Seyed Mohammad Javad Mortazavi Niloofar Aghazade Yousof Mousavi Department of Anatomy-Physiology Khatam Al-Nabieen University Kabul Afghanistan researches and Technology center Khatam Al-Nabieen University Kabul Afghanistan ionizing and non-ionizing Radiation Protection research center (INIRPRC) Shiraz University of Medical Sciences Shiraz Iran

Background: As a part of modern life, using electromagnetic field exposure has increased. EMFs might produce a variety of adverse effects on different parts of human body including the reproductive system. The consequences of exposure to the emitted EMFs from a hair dryer on sperm parameters were the major concerns of the present study. Materials and Methods: Fifty four adult Male Sprague-Dawley rats were randomly assigned to 9 groups. Samples from all experimental groups received exposure with two different modes: switch on (hot wind) and switch off (cold wind). Samples of group 1 (control) maintained under experimental conditions without any exposure. The exposure protocol for samples in groups 2 to 9 were 10 cm at 10 min—on, 10 cm at 10 min—off, 10 cm at 20 min—on, 10

关键词： Electromagnetic Field Microwaves Hair Dryer Sperm Motility

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A measurement system for alpha and beta surface emission rate using MWPC

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Chinese Physics C 2015年第5期39卷 60-63页

作者：林业方方任家富何林峰唐方东徐一鹏丁卫撑 Provincial Key Laboratory of Applied Nuclear Techniques in Geosciences Chengdu University of Technology Laboratory of ionizing Radiation Shanghai Institute of Measurement and Testing Technology

We have developed a large area multi-wire proportional counter （MWPC） as a standard for the measurement of alpha and beta surface emission rate at the Shanghai Institute of Measurement and Testing Technology （SIMT）. To shorten the preparation time for chamber gas refilling, a self-designed gas control unit was adopted. Various characteristics of the system have been studied. The uncertainties were analysed. Three certified alpha plane sources （Am-241） and six certified beta plane sources （T1-204 and Sr-90/Y-90） were measured by this system, The results show excellent agreement with the surface emission rate reported by the National Institute of Measuring, China （NIM） that En values of all measured sources are within ±1.

关键词： alpha/beta counting surface emission rate plateau curve MWPC

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Adsorption characteristics of thorium on silica-based anion exchange resins

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Nuclear Science and Techniques 2015年第6期26卷 55-62页

作者：陈彦良赵龙韦悦周何林锋唐方东 Nuclear Chemical Engineering Laboratory School of Nuclear Science and EngineeringShanghai Jiao Tong University Division of Chemistry and ionizing Radiation Measurement Technology Shanghai Institute of Measurement and Testing Technology

To isolate and separate thorium from nitric acid solutions, three silica-based anion exchange resins were synthesized. Batch experiments were carried out to investigate adsorption behavior of thorium in nitric acid solutions. Adsorption at different concentrations of nitric acid and thorium, influence of contact time and coexisting metal ions, and effect of NO3– were investigated in detail. It was found that at high HNO3 concentrations,the resins exhibited higher adsorption capacity and better affinity towards thorium. The adsorption kinetics could be described by the pseudo-second order model equation, while the adsorption isotherms were well correlated by the Langmuir model. The maximum capacity towards thorium species on SiPyR-N4 was evaluated at 27–28 mg/g-resin. The thermodynamic parameters indicated the adsorption was an exothermic reaction. The presence of NO3– was found to promote the retention of the thorium species.

关键词：阴离子交换树脂二氧化硅基吸附特性硝酸钍硝酸溶液模型方程吸附动力学吸附等温线

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Neutron activation analysis of ceramic tiles and its component and radon exhalation rate

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Journal of Environmental Sciences 2004年第1期16卷 94-99页

作者： A.El-Shershaby A.Sroor F.Ahmed A.S.Abdel-Haleem Z.Abdel Nuclear Physics Laboratory Faculty of WomenAin-Shams UniversityNuclear Physics LaboratoryFaculty of WomenAin-Shams UniversityIonizing Radiation DepartmentNational Institute for StandardsHot Laboratories CenterAtomic Energy AuthorityNuclear Physics LaboratoryFaculty of WomenAin-Shams University Cairo EgyptCairo EgyptGiza EgyptCairo EgyptCairo Egypt

The concentrations of 20 trace elements in several ceramics tiles and ceramic composites used in Egypt were elementally analyzed by neutron activation analysis(NAA) technique. The samples and standard were irradiated with reactor for 4 h(in the Second research Egyptian Reactor(Et-RR-2)) with thermal neutron flux 5.9×10 13 n/(cm 2·s).The gamma-ray spectra obtained were measured for several times by means of the hyper pure germanium detection system(HPGe). Also a solid state nuclear track detector(SSNTD) CR-39, was used to measure the emanation rate of radon for these samples. The radium concentrations were found to vary from 0.39—3.59 ppm and the emanation rates were found to vary from (0.728—5.688) × 10 -4 kg/(m 2· s).The elemental analysis of the ceramic tiles and ceramic composites have a great importance in assigning the physical properties and in turn the quality of the material.

关键词： ceramic neutron activation analysis(NAA) radon emanation solid state nuclear track detector(SSNTD)

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Photoluminescence and thermoluminescence properties of dysprosium doped zinc metaborate phosphors

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Journal of Rare Earths 2008年第2期26卷 203-206页

作者：李娟张纯祥唐强郝景权张彦立苏锵王淑彬 Chemistry and Biology College Beihua University Department of Physics Sun Yat-Sen University Key Laboratory of Rare Earth Chemistry and Physics Changchun Institute of Applied Chemistry Chinese Academy of Sciences ionizing Radia- tion Division National Institute of Metrology

Polycrystalline powder samples of dysprosium doped Zn（BO2）2 phosphors were prepared by solid state reaction in air at high temperature and characterized by X-ray powder diffraction. The IR, Photoluminescence （PL）, diffuse reflectance and three-dimensional （3D） thermoluminescence （TL） emission spectrum after 60^Co gamma ray irradiation were investigated. The characteristic 3D TL emission bands at about 425, 481 and 573 um with a main emission band of around 573 um were attributed to the host emission, 4^F9/2→6H15/2 and F9/2→6^H13/2 f-f transitions of Dy^3＋ ions. No emission from Dy^2＋ ions was observed in the measurement wavelength range. The TL-dose response of the Zn（BO2）2：Dy polycrystalline powder sample to gamma ray radiation in the range from 1 to 100 Gy at clinical dose levels was almost linear. The experimental results showed that Zn（BO2）2：Dy had potential use as the materials of gamma-ray thermoluminescence dosimeter （TLD） for clinical dosimetry.

关键词： thermoluminescence dysprosium dosimetry zinc metaborate Gamma-ray rare earths

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Depth Dependence of Tetragonal Distortion of a ZnO/Mg0.1Zn0.90/ZnO Heterostructure Studied by Rutherford Backscattering/Channeling

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Chinese Physics Letters 2009年第10期26卷 196-199页

作者：王坤丁志博李琳姚淑德 State Key Laboratory of Nuclear Physics and Technology Peking University Beijing 100871 Division of Metrology in ionizing Radiation and Medicine National Institute of Metrology Beijing 100013

Rutherford backscattering and channeling are used to characterize the structure of a ZnO/Mg0.1Zn0.90/ZnO heterostructare grown on a sapphire （0001） substrate by rf plasma-assisted molecular beam epitaxy. The results show that the Mg0.1Zn0.90 layer has the same hexagonal wurtzite structure as the underlying ZnO layer, and the heterostructure has a good crystalline quality with xmin = 5%, which is the ratio of the backscattering yields of aligned and random spectra in the near-surface region. Using the channeling angular scan around an off-normal （1213） axis in the {1010} plane of both ZnO and MgZnO layer, the tetragonal distortion εT, which is caused by the elastic strain in the epilayer, is determined. The depth dependence of εT is obtained by using this technique. It can clearly be seen that the elastic strain rapidly decreases with the increase in thickness of the ZnO film in the early growth stage and becomes slightly larger in the region of the Mg0.1Zn0.9O layer.

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