Showing papers in "Nuclear Engineering and Technology in 1997"

TL;DR: In this paper, the authors investigated the direct contact condensation phenomenon, which occurs when steam is injected into the subcooled water, and found that the magnitude of the average condensation heat transfer coefficient depends mainly on the steam mass fin.

TL;DR: In this paper, a computational method is developed for predicting the steady-state temperature field in an LMR core, where detailed core-wide coolant temperature profiles are efficiently calculated using the simplified energy equation mixing model and the subchannel analysis method.

TL;DR: In this article, the authors examined the effects of various parameters (i.e., the location of flashing inception, the degree of subcooling, the stagnation temperature and pressure, and the pipe size) on the critical two-phase flow rates of sub-cooled water through short pipes with small diameters.

TL;DR: In this article, the authors reviewed cooling aspects of the diverter system in Tokamak fusion devices with primary emphasis on the critical heat flux (CHF) issues for oater-cooled designs.

TL;DR: In this article, the authors examined the molten core-concrete interaction (MCC) using 20kg of thermite melt (Fe + O) and the concrete, used in Yonggwang Nuclear Power Plant Units 3 and 4 (YGN 3 & 4) in Korea.

TL;DR: In this paper, the authors demonstrate that the tube displacement is less than 0.01 inch rms at 100% of full power flow and quantify the remaining design margin at 120ft and 140% of total power flow.

TL;DR: In this article, the effects of three mechanisms, calcium depletion, sulphate and carbonate penetration, on the concrete degradation have been studied, and the shrinking core model (SCM) and the HYDROGEOC model have been applied to evaluate how fast the mechanisms proceed.

TL;DR: In this paper, an experimental investigation of helium-air exchange flows through partitioned opening and too-opening was conducted in high temperature engineering test reactor, where a test vessel with the too types of small opening on top of test cylinder was used for experiments.

TL;DR: In this paper, the authors developed the numerical guide for the cost-benefit analysis of ORE to meet the criterion of ALARA in the design stage of the KNGR, which is defined by the risk to unit collective radiation exposure dose (deaths/person-Sv) and the monetary value of human life ($/death).

TL;DR: In this article, a two-dimensional continuum model for the hydrogen mining phenomena in the containment subcompartment under severe accident conditions has been developed to predict the spatial distribution of the hydrogen concentration.

TL;DR: In this paper, the authors proposed a method to solve the problem of the lack of resources in the South Korean market by using the concept of "social media" and "social networks".

TL;DR: In this paper, a closed-loop controller for the control rod drive mechanism (CRDM) was designed, which can optimize the performance and maximize the reliability of CRDM operation.

TL;DR: The proposed concept of fuzzy probability to represent expert opinion is proposed and applied to the evaluation of the probability of a bottom head failure for the flooded case in the Peach Bottom BWR nuclear power plant.

TL;DR: In this paper, a general argument about OBE elimination for the future nuclear power plant design, seismic responses of reactor vessel internals and fuel assembly for nuclear power plants were investigated as an example.

TL;DR: In this paper, a thermal conductivity correlation has been proposed which can be applied to high turnup fuel by considering both of thermal conductivities with turnup across fuel pellet and additional degradation at pellet rim due to very high porosity.

TL;DR: An oxide later thickness measuring device equipped with ECT probe system was developed by KAERI, and whose performance test was carried out in NDT(Non-destructive Test) hot-cell or PIE(Post Irradiation Examination) Facility as mentioned in this paper.

TL;DR: In this paper, the robust controller for the nuclear reactor power control system is designed by using the point kinetics equations and the singly lumped energy balance equations, since the model is not exact, the controller which can make the actual system robust is necessary.

TL;DR: A new optimizing tool named the hybrid MGA-SA is developed to determine the weighting parameters of the LQR system, which can be easily incorporated with any forms of the cost function and provides the great flexibility in the optimization problems.

TL;DR: In this article, the authors investigated the correlation of isotope composition of uranium, plutonium and neodymium with the burnup in M uranium dioxide fuel and determined the total and fractional(U) burnup were determined by Nd-148 and, U and Pu mass spectrometric method respectively.

TL;DR: The neutronic feasibility of a Korean three-loop 900MWe class PWR core loaded with mixed oxide fuels for both annual and 18-month cycle strategies has been investigated as a means for spent fuel management as discussed by the authors.

TL;DR: In this paper, a sodium fire model is suggested to analyze the sodium pool fire where both the flame and the reaction products are considered and also, a software code, SOPA, is developed.

TL;DR: A number of promising approaches have been developed and evaluated as discussed by the authors, including chemical, physical and biological methods ranging from the very simple to highly sophisticated techniques, to determine whether or not a particular food sample has been irradiated.

TL;DR: In this article, the phase separation of simulated duplex stainless steel was detected by Mossbauer spectroscopy and magnetic property analysis by VSM(Vibrating Specimen Magnetometer).

TL;DR: In this paper, the effect of three independent variables (Sr, Vo1/Wt, [pH]) on the sorption of domestic granite (HG) and tuff (TF) samples was investigated.

TL;DR: In this article, air-oxidation experiments on unirradiated and irradiated UO were performed at temperature from 150 to 375 for investigating the long-term storage behavior of spent PWR fuel.

TL;DR: In this article, a new capsule that has a unique structure in which the test environments including neutron flux and fluence, and irradiation temperature can be controlled precisely during irradiation, was conceptually designed.

TL;DR: In this paper, a new approach to the evaluation of an accident management strategy when an operator action is involved is presented, which classifies the failure in implementing a given strategy into four possible mechanisms, and provides their corresponding quantification methods.

TL;DR: In this paper, the authors proposed an approach consisting of the resole in minimal mean unavailability of the two-out-of-four system with adverse effects, analytically calculated for the example system.

TL;DR: In this paper, Korean-made alloys 600 and 690 tubes were evaluated by flare tests according to ASTM standards, and acting stresses during the test ore analysis were analyzed.