• Journal of Nuclear Fuel Cycle and Waste Technology(JNFCWT)
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• v.17 no.4
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• pp.375-387
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• 2019

In this study, the radiation dose rates for the design basis fuel of 360 assemblies CANDU spent nuclear fuel transportation cask were evaluated, by measuring radiation source terms for the design basis fuel of a pressurized heavy water reactor. Additionally, radiological safety evaluation was carried out and the validity of the results was determined by radiological technical standards. To select the design basis fuel, which was the radiation source term for the spent fuel transportation cask, the design basis fuels from two spent fuel storage facilities were stored in a spent fuel transportation cask operating in Wolsung NPP. The design basis fuel for each transportation and storage system was based on the burnup of spent fuel, minimum cooling period, and time of transportation to the intermediate storage facility. A burnup of 7,800 MWD/MTU and a minimum cooling period of 6 years were set as the design basis fuel. The radiation source terms of the design basis fuel were evaluated using the ORIGEN-ARP computer module of SCALE computer code. The radiation shielding of the cask was evaluated using the MCNP6 computer code. In addition, the evaluation of the radiation dose rate outside the transport cask required by the technical standard was classified into normal and accident conditions. Thus, the maximum radiation dose rates calculated at the surface of the cask and at a point 2 m from the surface of the cask under normal transportation conditions were respectively 0.330 mSv·h^-1 and 0.065 mSv·h^-1. The maximum radiation dose rate 1 m from the surface of the cask under accident conditions was calculated as 0.321 mSv·h^-1. Thus, it was confirmed that the spent fuel cask of the large capacity heavy water reactor had secured the radiation safety.

• Journal of the Korean housing association
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• v.17 no.2
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• pp.151-158
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• 2006

Medical technology being developed, the increase of the aged population brings about many changes in financial standard, consciousness and lifestyle. And the increase of a nuclear family and a professional woman makes their family not to be able to support them anymore. Because aged people also don't want to rely on their family, aged people households are growing gradually. These causes make a house and a living environment of aged people to new social problems and these became elements to determine the living quality. In case of advanced nations a house considered of the physical character of aged people has been planned and they can live with various services in their houses and community that they are living without moving: But a hou! se for aged people is initial stage in Korea. And most facilities are poor and just for protection and accommodation. Although concerning a house for the aged according to revised the aged welfare law, companies are waiting to build because of problems of cognition and regulation. Therefore the plan considered of the character of the aged is being needed for the independent and comfortable living of the aged.

• Proceedings of the Korean Institute of Interior Design Conference
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• 2006.05a
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• pp.254-258
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• 2006

Decrease of children caused by economic growth, scientific and technological advancement, long life, spread of nuclear families, increase of women's entry in public affairs, etc. in modern society has given rise to aging societies as another social problem. This has resulted in the advent of problems of the aged and necessity of geriatric hospitals specializing in providing medical services for the old. Even though the geriatric hospitals currently operated are mainly used by aged persons, however, their color environment has been decided, for the most pin, not in view of characteristics of the old but in view of supporting families' criteria for selection of facilities. This study intends to help geriatric hospital designers recognize importance of color environment considering characteristics of the old and select the relevant colors In designing geriatric hospitals in future to elevate remedial value and prevent accidents in space use. To this end, this study suggests problems of color environment found in surveys of the existing geriatric hospitals currently operated throughout the nation and further make some proposals for improvement.

• Earthquakes and Structures
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• v.15 no.3
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• pp.295-306
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• 2018

Reinforced concrete containment (RCC) building has long been considered as the last barrier for keeping the radiation from leaking into the environment. It is important to quantify the performance of these structures and facilities considering extreme conditions. However, the preceding research on evaluating nuclear power plant (NPP) structures, particularly considering mainshock-aftershock seismic sequences, is deficient. Therefore, this manuscript serves to investigate the seismic fragility of a typical RCC building subjected to mainshock-aftershock seismic sequences. The implementation of the fragility assessment has been performed based on the incremental dynamic analysis (IDA) method. A lumped mass RCC model considering the tri-linear skeleton curve and the maximum point-oriented hysteretic rule is employed for IDA analyses. The results indicate that the seismic capacity of the RCC building would be overestimated without taking into account the mainshock-aftershock effects. It is also found that the seismic capacity of the RCC building decreases with the increase of the relative intensity of aftershock ground motions to mainshock ground motions. In addition, the effects of artificial mainshock-aftershock ground motions generated from the repeated and randomized approaches and the polarity of the aftershock with respect to the mainshock on the evaluation of the RCC are also researched, respectively.

• 한국정보통신설비학회:학술대회논문집
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• 2009.08a
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• pp.54-58
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• 2009

In this paper, the ECT(eddy current testing) signal analysis of eddy current array probe for inspection of SG(steam generator) tube in NPP(nuclear power plant) using electromagnetic FEM(finite element method) was performed. To obtain the electromagnetic characteristics of probes, the governing equation was derived from Maxwell's equation, and the problem was solved by using the 3-dimensional FEM. The types of defects were FBH(flat bottomed hole) and OD groove, Spiral groove, natural defects(pitting, SCC, multiple SCC, wear). The depth of FBH defects were 20%, 40%, 60%, 80%, 100 of SG tube thickness, and it was assumed that the defects were located on the tube outside. And the operation frequency of 100kHz, 300kHz and 400kHz were used. Material of specimen was Inconel 600 which is usually used for SG tubes in NPP. The signal difference could be observed according to the variation of size and depth on FBH defects and operation frequencies. The results in this paper can be helpful when the ECT signals from EC array probe are evaluated and analyzed.

• Proceeding of Spring/Autumn Annual Conference of KHA
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• 2009.04a
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• pp.137-142
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• 2009

The purpose of this study is to collect baseline data about the demands for housing regeneration of the permanent rental apartment dwellers. Self-administered questionaires and interviews were provided to 144 dwellers in Incheon Man-soo 7 complex from 2008 December 29th to 31st. The collected data was used to conduct comparative and descriptive statistical analysis: frequency, t-test, and $X^2$-test. The main findings are as follows : 1. House repairing and papering is most common used service by respondents. They also have much need for economic support. 2. Residents were satisfied with general environment of house. This survey showes that the highest satisfaction was about using food waste disposal sites. and the lowest satisfaction was about soundproof facilities on the other hand, among the questions. 3. Dwellers wanted to remodeling such as bathroom, restroom, a flower garden, space of landscape architecture. More than half dwellers preferred to leave among themselves living at permanent rental apartment as it is. 4. There is important difference in the demands of housing regeneration as the family trait. and variables of those were nuclear family or elderly/handicapped-family.

• Journal of the Korean housing association
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• v.21 no.1
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• pp.43-51
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• 2010

The purpose of this study is to collect baseline data about the demands for housing regeneration of the permanent rental apartment dwellers. Self-administered questionnaires and interviews were provided to 144 dwellers in Incheon Man-soo 7 complex from 2008 December 29th to 31 st. The collected data was used to conduct comparative and descriptive statistical analysis: frequency, t-test, and $\chi^2$-test. The main findings are as follows: 1. House repairing and papering is most common used service by respondents. They also have much need for economic support. 2. Residents were satisfied with general environment of house. This survey shows that the highest satisfaction was about using food waste disposal sites, and the lowest satisfaction was about soundproof facilities on the other hand, among the questions. 3. Dwellers wanted to remodeling such as bathroom, restroom, a flower garden, space of landscape architecture. More than half dwellers preferred to leave among themselves living at permanent rental apartment as it is. 4. There is important difference in the demands of housing regeneration as the family trait, and variables of those were nuclear family or elderly, handicapped-family.

• Transactions of the Korean Society of Machine Tool Engineers
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• v.10 no.2
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• pp.29-37
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• 2001

The application of laser in pipelines was started from the base of using laser in nuclear facilities industries and power plants. Because laser can be delivered to a remote area without any difficulties, the application of laser in many industries can solve many difficulties from limitation of access in danger area and reduced the risks of workers. Therefore, we developed a new experimental technique to measure internal defects of pressure vessels with a combination of shearog-raphy and image processing technique. Conventional NDT methods have been taken relatively much time, money and manpower because of performing as the method of contact with objects to be inspected. But digital shearography is laser-based optical method which allows full-field observation of surface displacement derivatives. This method has many advantages in practical use, such as low sensitivity to environmental noise, simple optical configuration and real time mea-surement. In this paper, we find the optimum shearing magnitude with EFM and experiment and measured internal crack length of the pressure vessels at a real time and estimated the error of the results.

• The Journal of the Korea institute of electronic communication sciences
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• v.7 no.2
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• pp.279-285
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• 2012

Most national critical key infrastructure, such like electricity, nuclear power plant, and petroleum is run on SCADA (Supervisory Control And Data Acquisition) system as the closed network type. These systems have treated the open protocols like TCP/IP, and the commercial operating system, which due to gradually increasing dependence on IT(Information Technology) is a trend. Recently, concerns have been raised about the possibility of these facilities being attacked by cyber terrorists, hacking, or viruses. In this paper, the method to minimize threats and vulnerabilities is proposed, with the virtual honeynet system architecture and the attack detection algorithm, which can detect the unknown attack patterns of Zero-Day Attack are reviewed.

• Transactions of the Korean Society of Mechanical Engineers
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• v.19 no.10
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• pp.2586-2594
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• 1995

Two phase flow phenomena are observed in many industrial facilities and make much importance of optimum design for nuclear power plant and various heat exchangers. This experimental study has been investigated the classification of the flow pattern, the local void distribution and convective heat transfer in swirl and non-swirl two phase flow under the isothermal and nonisothermal conditions. The convective heat transfer coefficients in the single phase water flow were measured and compared with the calculated results from the Sieder-Tate correlation. These coefficients were used for comparisons with the two-phase heat transfer coefficients in the flow orientations. The experimental results indicate, that the void probe signal and probability density function of void distribution can used into classify the flow patterns, no significant difference in voidage distribution was observed between isothermal and non-isothermal condition in non-swirl flow, the values of two phase heat transfer coefficients increase when superficial air velocities increase, and the enhancement of the values is observed to be most pronounced at the highest superficial water velocity in non-swirl flow. Also two phase heat transfer coefficients in swirl flow are increased when the twist ratios are decreased.