• Journal of Radiation Protection and Research
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• v.14 no.1
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• pp.66-70
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• 1989

In routine testing, the radioactive neutron sources are particularly suitable for producing standard. neutron fields. The ISO TC-85 has proposed neutron reference radiation for the calibration of neutron measuring devices used for radiation protection purposes. Radiation laboratory of KSRI has installed a standard irradiation facility using $^{252}Cf$ and $^{241}Am-Be$ sources for calibrating personal dosimeters according to the recommendations given in ISO TC-85. In this study, correction factors for calibration related to neutron scattering and anisotropy are obtained by experiments with commercial rem meter for demonstration purposes.

• Corrosion Science and Technology
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• v.5 no.3
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• pp.106-111
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• 2006

Painting has protected metallic stack but the paint films may be degraded and corrosion problem can be arisen. To protect the painted metal stack, cathodic protection can be applied. If cathodic protection is applied to bare metal, only small area may be protected. However, if cathodic protection is applied to painted metal surface, large area can be protected and the lifetime of paint films can be extended. High corrosion resistant alloys were corroded at a Flue Gas Desulfurization (FGD) facility of power plant within a short period and thus cathodic protection can be used to protect these metals. On the base of computer simulation, if cathodic protection is applied to bare metal in a FGD environment, it was estimated that applied current could almost be spent to protect area near the anode. However, if cathodic protection is applied to high resistant-coated metal, the much larger area from the anode could be effectively protected.

• Proceedings of the Korea Concrete Institute Conference
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• 1997.10a
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• pp.743-748
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• 1997

In this paper, a new type of precast perforated concrete block is presented to be used in the construction of a step seawall. The overtopping rate of the perforated step seawall is lower than that of the traditional non-perforated step seawall. In construction stage, the cost of total construction of the perforated block is cheaper than that of traditional block. The new type of perforated block may be used as an alternative for shore protection facility.

• Fire Science and Engineering
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• v.4 no.2
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• pp.3-13
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• 1990

Fire Protection System is facilities that Control the fire by mechanic means. Buildings Over a Certain Scale is required this system. As the small from the fire extinguisher as the large to the sprinkler system of automatic fire extinguishing equipment the kinds are various. With the development of architecture technique while modern higher buildings are increased. As fire is a first product that human make, it performed many profits and services for our mankind. Sometimes as it is profitable fire or harmful fire, it takes charge of human's life culture. Therefore fire protection system is facilities that control the ]after fire by mechanic means Building over a certain scale is required this system. As the small from the fire extinguisher as the large to the sprinkler system of automatic fire extinguishing equipment, the kinds are various. With the development of architecture technique while modern Higher buildings are increased high level and fire prevent facilities aren't reached to that level. The object of this study is present the problem which appear from the analysis of place standard for fire protection facility. This study described as a following order. First. We are going to look history of the fire protection system and change course of that with the year and facility. Second, We say the frame system and special nature of the foreign fire prevent Act. Third. We understand the control reality of fire protection system. Fourth. We took out the merit of foreign fire prevent law and the problem of our current domestic system. The placing standard of proper fire protection facilities that be presented from this study are followed next. 1) We have reinforce sprinkler system placing standard for the fire extinguishing and check the spread of fire. 2) We must to be ruled the standard for keeping fire prevention system that are received reality and people's idea. 3) We should prepare lawful basis which can be place fire prevention center. 4) We have to correct the standard of use about complex building without mainuse and we take increase the real effectiveness of this. 5) We ought to match the use of current fire prevention act and the use of architecture law.

• Fire Science and Engineering
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• v.5 no.1
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• pp.5-14
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• 1991

Fire Protection System is facilities that Control the fire by mechanic means. Buildings Over a Certain Scale is required this system. As the small from the fire extinguisher as the large to the sprinkler system of automatic fire extinguishing equipment the kinds are various. With the development of architecture technique while modern higher buildings are increased. As fire is a first product that human make, it performed many profits and services for our mankind. Sometimes as it Is profitable fire or harmful fire, it takes charge of human's life culture. Therefore fire protection system is facilities that control the latter fire by mechanic means Building over a certain scale is required this system. As the small from the fire extinguisher as the large to the sprinkler system of automatic fire extinguishing equipment, the kinds are various. With the development of architecture technique while modern higher buildings are increased high level and fire prevent facilities aren't reached to that level. The object of this study is present the problem which appear from the analysis of place standard for fire protection facility. This study described as a following order. First, We are going to look history of the fire protection system and change course of that with the year and facility. Second. We say the frame system and special nature of the foreign fire prevent Act. Third. We understand the control reality of fire protection system. Fourth. We took out the merit of foreign fire prevent law and the problem of our current domestic system. The placing standard of proper fire protection facilities that be presented from this study are followed next. 1) We have to reinforce sprinkler system placing standard for the fire extinguishing and check the spread of fire. 2) We must to be ruled the standard for keeping fire prevention system that are received reality and people's idea. 3) We should prepare lawful basis which can be place fire prevention center. 4) We have to correct the standard of use count about complex building without mainuse and we take increase the real effectiveness of this. 5) We ought to match the use of current fire prevention act and the use of architecture law.

• Journal of Korean society of Dental Hygiene
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• v.7 no.1
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• pp.1-13
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• 2007

In Korea, respect for the aged and filial devotion is treated as basic ethics for human life, and family takes care of the aged person mainly. Nowadays, family support on the aged person is prioritized than the others. However, number of aged person is growing, and family, which is used to protect the aged, becomes nuclear through industrialization. In addition, social advancement of female induces weakened supporting function of family, and all these issues generate the problem of protection for the aged as significant social problems. Author conducted oral inspection and questionnaire for the aged in some welfare facilities in Gyeongnam location from December 2005 to February 2006 to improve quality of life and oral hygiene of the aged. Through gathered data, the actual condition of oral hygiene management on the aged person in welfare facility was evaluated as fundamental data for project development on oral hygiene of aged person. Through the analysis of inspected data, the following conclusions are derived. 1. Management status of oral hygiene is mostly not good, and toothbrushing per day is 'one time' for the most cases. 2. In free-of-charge facility, monthly allowance is 'under 50 thousand won' for the most cases. 3. Time for visiting oral treatment facility is on 'when toothache is occurred' for the most cases. For treatment content, 'prosthetic dentistry' takes 36.8% in charged facility, and 'tooth extraction' is 27.0% for free-of-charge facility. 4. Average DMFT index of the aged in charged facility is 16.81, and free-of-charge facility is 21.71. 5. Average number of functional teeth in charged facility is 15.22, and free-of-charge facility shows 7.29. 6. Average number of remained teeth in charged facility is 15.71, and the umbe in free-of-charge facility is 9.04. 7. Average number of extractable teeth in charged facility is 0.48, and for free-of-charge facility, the number goes up to 1.70.

• Journal of Radiation Protection and Research
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• v.38 no.4
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• pp.189-193
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• 2013

Annual dose on the containment building wall of the interim storage facility at normal condition was calculated to estimate the dose rate transition of the facility of PWR spent nuclear fuel. In this study, source term was generated by ORIGEN-ARP with 4.5 wt% initial enrichment, 45,000 MWd/MTU burnup and 10 years cooling time. Modeling of the storage facility and the containment building and radiation shielding evaluations were conducted by MCNP code depending on the distance between the wall and the facility in the building. In the case of the centralized storage system, the distance required for the annual dose rate limit from 10CFR72 was estimated to be 50 m.

• Journal of Radiation Protection and Research
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• v.46 no.2
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• pp.58-65
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• 2021

Background: The evaluation of skyshine distribution, release of airborne radioactive nuclides, and soil activation and groundwater migration were required for radiological assessment of the impact on the environment surrounding In-Flight (IF)-system facility of the RAON (Rare isotope Accelerator complex for ON-line experiment) accelerator complex. Materials and Methods: Monte Carlo simulation by MCNPX code was used for evaluation of skyshine and activation analysis for air and soil. The concentration model was applied in the estimation of the groundwater migration of radionuclides in soil. Results and Discussion: The skyshine dose rates at 1 km from the facility were evaluated as 1.62 × 10^-3 μSv·hr^-1. The annual releases of ³H and ¹⁴C were calculated as 9.62 × 10^-5 mg and 1.19 × 10^-1 mg, respectively. The concentrations of ³H and ²²Na in drinking water were estimated as 1.22 × 10^-1 Bq·cm^-3 and 8.25 × 10^-3 Bq·cm^-3, respectively. Conclusion: Radiological assessment of environmental impact on the IF-facility of RAON was performed through evaluation of skyshine dose distribution, evaluation of annual emission of long-lived radionuclides in the air and estimation of soil activation and groundwater migration of radionuclides. As a result, much lower exposure than the limit value for the public, 1 mSv·yr^-1, is expected during operation of the IF-facility.

• Journal of Radiation Protection and Research
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• v.34 no.1
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• pp.1-7
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• 2009

It is expected that a substantial amount of spent fuels will be transported from the four nuclear power plant (NPP) sites in Korea to a hypothetical centralized interim storage facility or a final repository in the near future. The cost for the transportation is proportional to the amount of spent fuels. In this paper, a cost estimation program is developed based on the conceptual design of a transportation system and a logistics analysis. Using the developed computer program, named as CASK, the minimum capacity of a centralized interim storage facility (CISF) and the transportation cost for PWR spent fuels are calculated. The PWR spent fuels are transported from 4 NPP sites to a final repository (FR) via the CISF. Since NPP sites and the CISF are located along the coast, a sea-transportation is considered and a road-transportation is considered between the CISF and the FR. The result shows that the minimum capacity of the interim storage facility is 15,000 MTU.

• Journal of the Korean Institute of Gas
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• v.27 no.4
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• pp.102-109
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• 2023

In realizing a hydrogen society, it is important to secure the safety of the hydrogen refueling station, which is the facility where consumers can easily meet hydrogen. The hydrogen refueling station consists of compressed gas facilities that store high-pressure hydrogen, and there is a risk that the high-pressure compressed gas facility will rupture due to a fire explosion due to hydrogen leakage in the facility or the influence of surrounding fires. Accordingly, the Korea Gas Safety Corporation is making every effort to find out risk factors from the installation stage, reflect them in the design, and secure safety through legal inspection. In this study, a TNT explosion demonstration test using a protection wall was conducted to confirm the safety effect of the protection wall installed at the hydrogen refueling station, and the empirical test results were compared and verified using FLACS-CFD, a CFD program. As a result of the empirical test and CFD analysis, it was confirmed that the effect of reducing the explosion over-pressure at the rear end of the protection wall decreased from 50% to up to 90% depending on the location, but the effect decreased when it exceeded a certain distance. The results of the empirical test and computer analysis for verifying the safety of the protection wall will be used in proposals for optimizing the protection wall standards in the future.