Go to the main menu
Skip to content
Go to bottom
REFERENCE LINKING PLATFORM OF KOREA S&T JOURNALS
> Journal Vol & Issue
Nuclear Engineering and Technology
Journal Basic Information
Journal DOI :
Korean Nuclear Society
Editor in Chief :
Volume & Issues
Volume 33, Issue 6 - Dec 2001
Volume 33, Issue 5 - Oct 2001
Volume 33, Issue 4 - Aug 2001
Volume 33, Issue 3 - Jun 2001
Volume 33, Issue 2 - Apr 2001
Volume 33, Issue 1 - Feb 2001
Selecting the target year
Gamma-Radiation Induced Apoptotic and Inflammatory Degeneration of Mouse Ovarian Follicles : Informative Biological-End Point for Disaster-Prevention
Kim, Jin-Kyu ; Chun, Ki-Jung ; Lee, Chang-Joo ; Lee, Kyoung-Hee ; Kim, Seul-Kee ; Yoon, Yong-Dal ;
Nuclear Engineering and Technology, volume 33, issue 3, 2001, Pages 255~260
In mammals, most of the follicles can not be ovulated, and instead, are degenerated throughout the entire reproductive period. However, the precise mechanism of follicle atresia is unknown. Three weeks old female mice (ICR strain) were
-irradiated with a dose of LD
. Before irradiation (day 0) and at day 1, 2, and 3 after irradiation, the normal and atretic preantral and antral follicles of the left ovaries were morphologically observed. Atretic follicles at 2 days after irradiation had numerous cell debris, apoptotic cells and bodies, and polymorphonuclear leukocytes in the antral cavity. In severely atretic follicles, numerous polymorphonuclear leukocytes infiltrated into the follicle. The frequencies of atretic antral (58.0
8.6) and preantral follicles (27.3
11.2) induced by
-radiation increased to 94.0
3.4 and 86.9
7.6, respectively at 2 days after irradiation (p<0.05). The number of follicles with one or more neutrophils in the largest cross sections at 2 and 3 days after irradiation significantly increased (p<0.05). It can be concluded that
-radiation triggers the recruitment of neutrophils into the follicles during degeneration. The ovarian follicles can make a role of informative biological end-point useful for disaster-prevention.
Experimental Study on Uranium Sorption onto Silica Colloids: Effects of Geochemical Parameters
Baik, Min-Hoon ; Hahn, Pil-Soo ;
Nuclear Engineering and Technology, volume 33, issue 3, 2001, Pages 261~269
In this study, sorption experiments of uranium onto silica colloids were carried out and the effects of important geochemical parameters such as pH, ionic strength, carbonate concentration, colloid concentration, and total concentration of uranium were investigated. The sorption coefficients of uranium for silica colloids named as pseudo-colloid formation constants were about 10
mL/g depending on the experimental conditions. The effects of the geochemical parameters were found to be important in the sorption of uranium onto silica colloids. A Langmuir type sorption isotherm of uranium between silica colloids and the solution phase was also presented. The sorption mechanisms were explained by analyzing the effects of the geochemical parameters.
Quantification of Entire Change of Distributions Based on Normalized Metric Distance for Use in PSAs
Han, Seok-Jung ; Chun, Moon-Hyun ; Tak, Nam-Il ;
Nuclear Engineering and Technology, volume 33, issue 3, 2001, Pages 270~282
A simple measure of uncertainty importance based on normalized metric distance to quantify the entire change of cumulative distribution functions (CDFs) has been developed for use in probability safety assessments (PSAs). The metric distance measure developed in this study reflects the relative impact of distributional changes of inputs on the change of an output distribution, white most of the existing uncertainty importance measures reflect the magnitude of relative contribution of input uncertainties to the output uncertainty. Normalization is made to make the metric distance measure a dimensionless quantity. The present measure has been evaluated analytically for various analytical distributions to examine its characteristics. To illustrate the applicability and strength of the present measure, two examples are provided. The first example is an application of the present measure to a typical problem of a system fault tree analysis and the second one is for a hypothetical non-linear model. Comparisons of the present result with those obtained by existing uncertainty importance measures show that the metric distance measure is a useful tool to express the measure of uncertainty importance in terms of the relative impact of distributional changes of inputs on the change of an output distribution.
Effect of Spacer Grids on CHF at PWR Operating Conditions
Ahn, Seung-Hoon ; Jeun, Gyoo-Dong ;
Nuclear Engineering and Technology, volume 33, issue 3, 2001, Pages 283~297
The CHF in PWR rod bundles is usually predicted by the local flow correlation approach based on subchannel analysis while difficulty exists due to the existence of spacer grids especially with mixing vanes. In order to evaluate the effect of spacer grids on CHF, the experimental rod bundle data with various types of spacer grids were analyzed using the subchannel code, COBRA-IV-i. For the Plain grid data, a CHF correlation was described as a function of local flow conditions and heated length, and then the residuals of the CHF in mixing vaned grids predicted by the correlation were examined in various kinds of grids. In order to compensate for the residual, three parameters, distances between grids and from the last grids to the CHF site, and equivalent hydraulic diameter were introduced into a grid parameter function representing the remaining effect of spacer grids predicted most of the CHF data points in plaing grids within
20 percent error band. Good agreement with the CHF data was also shown when the grid parameter function for mixing vaned grids of a specific design was used to compensate for the residuals of the CHF data predicted by the correlation.
Static Structural Analysis on the Mechanical behavior of the KALIMER Fuel Assembly Duct
Kim, Kyung-Gun ; Lee, Byoung-Oon ; Woan Hwang ; Kim, Young ll ; Kim, Yong su ;
Nuclear Engineering and Technology, volume 33, issue 3, 2001, Pages 298~306
As fuel burnup proceeds, thermal gradients, differential swelling, and inter-assembly loading may induce assembly duct bowing. Since duct bowing affects the reactivity, such as long or short term power-reactivity-decrement variations, handling problem, caused by top end deflection of the bowed assembly duct, and the integrity of the assembly duct itself. Assembly duct bowing were first observed at EBR-ll in 1965, and then several designs of assembly ducts and core restraint system were used to accommodate this problem. In this study, NUBOW-2D KMOD was used to analyze the bowing behavior of the assembly duct under the KALIMER(Korea Advanced Liquid MEtal Reactor) core restraint system conditions. The mechanical behavior of assembly ducts related to several design parameters are evaluated. ACLP(Above Core Load Pad) positions, the gap distance between the ducts, and the gap distance between the duct and restraint ring were selected as the sensitivity parameter for the evaluation of duct deflection.
The High Temperature Oxidation Behavior of l0wt%
J.H. Yang ; K.W. Kang ; Kim, K.S. ; K.W. Song ; Kim, J.H. ;
Nuclear Engineering and Technology, volume 33, issue 3, 2001, Pages 307~314
The changes of weight gain, structure, morphology and uranium oxidation states in l0wt% G
during the oxidation below 475
and heat treatment at 130
in air were investigated using TGA, XRD, SEM, EPMA and XPS. The room temperature (
Cubic Phase Converted to highly distorted (
-type sing1e Phase by oxidation at 475
in air. This oxidized phase was reduced by annealing at 130
in air. The room temperature XRD pattern of the 130
annealed powder revealed that (
-type single phase was separated into Gd-depleted
and Gd-enriched (
type cubic phase. The reduction and phase separation by the high temperature annealing of kinetically metastable and highly deformed (
-type phase are interpreted in terms of cation size difference between G
and U according to the oxidation state of U.U.U.U.U.te of U.U.U.U.U.
Air-Water Test on the Direct ECC Bypass During LBLOCA Reflood Phase with DVI : UPTF Test 21-D Counterpart Test
Yun, Byong-Jo ; Kwon, Tae-Soon ; Song, Chul-Hwa ; Euh, Dong-Jin ; Park, Jong-Kyun ; Cho, Hyoung-Kyu ; Park, Goon-Cherl ;
Nuclear Engineering and Technology, volume 33, issue 3, 2001, Pages 315~326
Direct ECC bypass phenomena that occur in a reactor vessel downcomer with a Direct Vessel Injection (DVI) system during the reflood phase of a Large Break Loss-of-Coolant Accident (LBLOCA) are experimentally investigated using a transparent l/7.5 scaled down test facility of the Upper Plenum Test Facility (UPTF). A series of separate effect tests are peformed in order to investigate the mechanisms of direct ECC bypass and to find out its scaling parameters. Various flow regimes and phasic distribution in downcomer are identified and mapped, and the fraction of direct ECC bypass is measured under a wide range of air and water injection conditions. From the counterpart test of the UPTF Test 21-D, the dimensionless gas velocity (
) is derived experimentally, which is believed to be a major scaling parameter for the fraction of direct ECC bypass. And it is found out that the direct ECC bypass is greatly affected by the spreading width of ECC water film and the geometric configuration of the downcomer.r.
Flow Analysis for Optimum Design of Mixing Vane in a PWR Fuel Assembly
In, Wang-Kee ; Oh, Dong-Seok ; Chun, Tae-Hyun ;
Nuclear Engineering and Technology, volume 33, issue 3, 2001, Pages 327~338
A computational fluid dynamics (CFD) analysis was performed to propose the optimum design of flow mixing vane on the space grid in a PWR fuel assembly. The flow mixing vanes considered in this study for optimum design are swirl-vane and twisted-vane. A single subchannel of one grid span was modeled using flow symmetry to minimize the computational effort. The CFD predictions are in good agreement with the experimental results for the split- vane, which shows the applicability of the CFD method. The mixing effect by swirling flow and crossflow, and the pressure drop were estimated and compared for the various vane angles. The optimum vane angle is proposed to be 40。 and 35。 from the direction of axial flow for the swirl-vane and the twisted-vane, respectively.
The Performance Evaluation of NSSS Control Systems for UCN 4
Sohn, Suk-Whun ; Song, In-Ho ; Sohn, Jong-Joo ; Park, Jong-Ho ; Seo, Jong-Tae ;
Nuclear Engineering and Technology, volume 33, issue 3, 2001, Pages 339~348
NSSS Control Systems automatically mitigate transient conditions and leads to a stable plant condition without operator actions when a transient occurs during normal power operation. In this paper, the function and performance of NSSS control systems were examined and evaluated by comparing the predicted results with the measured data for the selected events. Loss of a Main Feedwater Pump and Load Rejection to House Load Operation events were selected for the evaluation among the transient tests peformed during the Power Ascension Test (PAT) of UCN unit 4. The overall schematic control actions of NSSS control systems can be evaluated easily through the observation of these two typical events. The selected events were analyzed by the KISPAC computer code[l] which had been used in developing the control logic and determining the control setpoints during the plant design. Additionally, the performance of FWCS during low power operation was evaluated. The result of evaluation showed that the NSSS control systems were designed properly and the performance of the NSSS control systems was excellent and also the computer code had a good prediction capability.
Advanced Technology Trends in Development of Land-Mine Detection Systems
Hwang, Sun-Tae ; Park, Kil-Oung ;
Nuclear Engineering and Technology, volume 33, issue 3, 2001, Pages 349~354
While the United Nations UN) agencies work to restrict the manufacture, sale, and use of land-mines worldwide, a massive clean-up effort is needed to find and destroy the estimated 100 million land-mines still buried around the world. Land-mines left behind from wars worldwide are one of the past century＇s main unsolved problems of war and remain the focus of humanitarian land-mine detection and removal primarily in Europe, Africa, Asia and Central and South America. For example, approximately 1 million anti-personnel mines and other various kinds which have been buried in the 249.4 km (155 miles) demilitarized zone (DMZ) of the Korean peninsular should be completely removed in historical process of the peaceful unification between South and North Korea. In this regard, the current trends of technologies linked to land-mine detection systems are surveyed.