• Title/Summary/Keyword: Safety actual condition

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Leak Evaluation for Power Plant Valve Using Multi-Measuring Method

  • Lee, Sang-Guk;Park, Jong-Hyuck;Kim, Young-Bum
    • Journal of the Korean Society for Nondestructive Testing
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    • v.28 no.6
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    • pp.469-476
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    • 2008
  • Condition based maintenance(CBM) for the preventive diagnosis of important equipments related to safety or accident in power plant is essential by using the suitable methods based on actual power plant conditions. To improve the reliability and accuracy of the measured value at the minute leak situation, and also to monitor continuously internal leak condition of power plant valve, the development of a diagnosis and monitoring technique using multi-measuring method should be performed urgently. This study was conducted to estimate the feasibility of multi-measuring method using three different methods such as acoustic emission(AE) method, thermal image measurement and temperature difference$({\Delta}T)$ measurement that are applicable to internal leak diagnosis for the power plant valve. From the experimental results, it was suggested that the multi-measuring method could be an effective way to precisely diagnose and evaluate internal leak situation of valve.

Development of the Circuit Breaker with Data Processing Function and Wireless-communication Function (데이터 처리 및 무선통신기능을 갖는 회로차단기 개발 연구)

  • Kim, Gi-Hyun;Lee, Sang-Ick;Shin, Seong-Su;Bae, Seok-Myung;Joo, Nam-Kyu
    • The Transactions of The Korean Institute of Electrical Engineers
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    • v.60 no.8
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    • pp.1617-1621
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    • 2011
  • In this paper, in order to reduce the electrical disaster such as electrical fire at traditional markets, we need to develop the circuit breaker which is able to monitor the power status of electrical equipments. Therefore, for solving the those problems, we developed the detection censor(ZCT, CT) and equipment of data analysis and transmission. The detection censor and equipment is able to monitor the electrical equipments condition(over current, leakage current, arc, etc.). We constructed Test-Bed for testing reliability of the circuit breaker and obtained certification. And we tested the over current, leakage current and arc under the normal condition. This paper will be used to the data for development an cabinet panel which is able to monitor the actual loads.

Representative Rating of Bridges using Condition Assessment Data (상태평가 결과를 이용한 교량의 대표등급 산정방법)

  • Oh, Byung-Hwan;Kim, Kwang-Soo;Shin, Kyung-Joon;Lee, Sang-Cheol
    • Journal of the Korea institute for structural maintenance and inspection
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    • v.6 no.1
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    • pp.111-118
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    • 2002
  • Currently, the inspection of bridges is conduced for the parts or elements of a bridges and the results of inspection are depicted for those local elements. Therefore, the representative rating of a bridge as a whole bridge system is not presented. The purpose of the present study is to purpose a reasonable method which can yield realistic representative rating for an actual bridge. The purpose method consists of two steps, i.e, visual inspection step and safety assessment step. The importance of members is considered by introducing the weighting factors and the number of spans is also considered to obtain the representative rating of a whole bridge system. The purpose method may be efficiently used to calculate the realistic representative rating bridge structures.

A Heuristic Application of Critical Power Ratio to Pressurized Water Reactor Core Design

  • Ahn, Seung-Hoon;Jeun, Gyoo-Dong
    • Nuclear Engineering and Technology
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    • v.34 no.1
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    • pp.68-79
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    • 2002
  • The approach for evaluating the critical heat flux (CHF) margin using the departure from nucleate boiling ratio (DNBR) concept has been widely applied to PWR core design, while DNBR in this approach does not indicate appropriately the CHF margin in terms of the attainable power margin-to-CHF against a reactor core condition. The CHF power margin must be calculated by increasing power until the minimum DNBR reaches a DNBR limit. The Critical Power Ratio (CPR), defined as the ratio of the predicted CHF power to the operating power, is considered more reasonable for indicating the CHF margin and can be calculated by a CPR orrelation based on the heat balance of a test bundle. This approach yields directly the CHF power margin, but the calculated CPR must be corrected to compensate for many local effects of the actual core, which are not considered in the CHF test and analysis. In this paper, correction of the calculated CPR is made so that it may become equal to the DNB overpower margin. Exemplary calculations showed that the correction tends to be increased as power distribution is more distorted, but are not unduly large.

A Study on the Practical Use of ICT for Safety Education Specialists (안전교육전문인력에 대한 ICT활용 교육을 위한 실태조사)

  • Jeong, Sang
    • Journal of the Society of Disaster Information
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    • v.16 no.3
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    • pp.505-512
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    • 2020
  • Purpose: The purpose of this study is to identify the contents and problems of present education for safety education specialist and provide suggestions for improvement in the future by examining the current status of capacity building education for safe education specialist. Method: The analysis of current status was conducted based on the results of two training sessions on safety education specialists and the research on the actual condition was carried on targeting safety education specialists. Result: As a result of the research, most of the contents of education for safety education specialist are biased toward theory and lack of a systematic education system, resulting in that safety education tends to be field education and focuses on theory and audio-visual education. Safety education is not solved by theory, but can be maximized the effect through experience and practice to experience the real situation. Conclusion: Therefore, based on the results of this study, a method of ICT is proposed to utilize for safety education, so that safety education specialists can be provided with practical and effective safety education, which can be used at real safety field.

A Study on the Convergence Safety Management Improvement of Hazardous Material Facilities (위험물시설의 융합형 안전관리 개선방안에 관한 연구)

  • Ku, Jae-Hyun
    • Journal of the Korea Convergence Society
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    • v.9 no.7
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    • pp.47-53
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    • 2018
  • The actual condition of safety management and problems for hazardous material facilities in national industrial complex are investigated and analyzed in fields of hazardous material facilities safety, fire fighting equipment safety, building safety, space safety. In most cases, the failure to comply with legal requirements and the maintenance of fire safety have been pointed out. As a result, the total number of problems identified was 466 and problems in the field of hazardous material facilities safety have been pointed out the most. Also, it was analyzed that the number of problems identified in the manufacturing facilities and general handling centers among the hazardous materials facilities was the highest. Therefore, it will contribute to strengthening the safety management capability of the national industrial complex in the future by suggesting the convergence direction of the safety diagnosis system and the systematic introduction of the precise safety diagnosis.

Needs Accessment of Safety Education of High School Students in Seoul (서울시 고등학생의 안전교육 실태 및 요구도 조사)

  • 김민아;이명선
    • Korean Journal of Health Education and Promotion
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    • v.18 no.3
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    • pp.133-162
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    • 2001
  • Unexpected accidents in school has been gradually increased every year, and student's mistaken was the first reason of the accident. To preventing the students from Unexpected accidents in school, safety education is more important than having strong facilities to have much more strong protecting forces for the accidents. Therefore, systematic education of safety is needed most of all, and especially, strengthening safety education in school is needed. Hereby, this study is aimed at investigating and analysing the actual condition and demand of safety education. It also conducted a survey with the target of 1,255 students in the second grade of high school in Seoul from April 20 to May 19, and the result of this study is as follows. 1. In the general features of the subject of the survey, boy students and girl students occupied 50.8% and 49.2% each, and boys' high school (34.3%), girls' high school(32.2%) and co-ed(33.5%) participated in balance. In the location, north from Han river occupied 54.6%, south were 45.2%. 2. According to the status of experiencing an accident, boys were more experienced then girls(p〈0.05). From the section, home accident(56.8%) occupied most followed by school accident, traffic accident, sports accident and poisoning. The accident happening most often in detailed category is sports accident such as basket ball, foot ball and dodge ball. The actual condition of the subject's using a school health facility shows that boys students use it more often than girl students(p〈0.01) 3. In attitude toward safety, the subject showed lower interest in safety issues than other social issues. But attitude in seriality of safety problems were high. Also, they responded ‘individual citizen’(63.1%) as the one who should make efforts for safety. Regarding knowledge of preventing safety accidents in attitude toward individual safety, 42.2% answered ‘they know a little’ and 32.6% of respondents say ‘they do not know’. To a question of the degree of the subject's following safety rules, 36.4% were answered ‘keeping’ and the group using a school health facility shows more ‘keeping’ the others(p〈0.05). 4. To a question of asking if they have experienced safety education, 51.2% answered ‘yes’. Teachers who mainly take care of safety education are answered as training teacher(48.7%). As for education time, training class(51.3%) is said to have safety education most followed by health-related event and PE(Physical Education). Frequency of education shows once or twice a session (62.8%) most often, but in case of co-ed school, 5-7times a session or more(20.1%) are being practiced. Looking at education time, 1-2 hour(s)(22.1%) or for a short time(22.1%) during class are being practiced. As an education method, instruction(43.8%) and video education(32.5%) are being practiced, and when it comes to education evaluation method, ‘not practiced’(70.0%) answered. To the question if they are satisfied with school safety education, they answered more ‘no(43.1%)’ than ‘yes(6.7%)’, and the reason is that safety education class is just for formality's sake, and the fact they already know is being repeated. The contents of safety education is composed of school safety, home safety, and first aid. 5. It is turned out that 56.5% of the total boy students and 61.1% of the total girl students recognize the necessity of safety education. To the question if safety education is needed in an elementary and middle education course, 46.4% of the subject answer answered' it's necessary'. The most reason for their answers are ‘safety education is directly related to life’. 6. Regarding the requested time of safety education is ‘one hour a week’ by 55.9%. For safety education, safety education teachers(38.7%) are answered to be the most proper. As a request for safety education, video education is answered to be the most appropriate(30.6%), followed by practical skills, lecture and discussion(p〈0.05). Demand of educational evaluation, practical skills, interview and observation are answered to be needed. To the question if they want to participate in the way of demanded safety education, 41.9% of respondents answer ‘have a mind to participate in’ (41.9%). To benefits followed by completing safety education, 72.0% of respondents answer ‘agree’, and 24.7% ‘do not agree’, which means lout 4 disagrees with completing safety education. 7. Looking at demand of safety education according to the features of the subject, ‘our position for the person who has handicapped’ was answer to the most.

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Accident Analysis and Usage Actual Condition about Roller (롤러기 재해분석 및 사용실태 조사)

  • Choi, Jin-Woo;Shin, Woon-Chul
    • Journal of the Korean Society of Safety
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    • v.27 no.5
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    • pp.16-21
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    • 2012
  • The purpose of this study is to try to find the risk of roller(mixing mill) in working site. In order to achieve the purpose, accident analysis and survey was carried out. This analysis revealed that average of loss days is 334.3 by roller jamming accident and 229.2 by other causes. It means jamming accident entails serious bodily harm. According to our research, we realize that most of rollers have some risk of the jamming accidents. It is simply because the roll gap in the roller is not more than 10cm. It also does not meet minimum distance so as to avoid the risk for jamming accident by KS. Furthermore, 28% of rollers have only one switch and 40% of rollers have two switches operating emergence stop equipment so as to reduce the risk of jamming accidents. Therefore, we presume that it is very difficult to turn on the switch of emergence stop equipment when they confront the accident because most of engineers are working alone.

Safety Evaluation of Horizontal and Vertical Bolted Connection between PHC Piles Using Finite Element Analysis (유한요소해석을 통한 수평 및 수직볼트로 체결된 PHC 파일 연결부의 안전성 평가)

  • Kim, Su Eun;Kim, Sung Bo
    • Journal of Korean Society of Steel Construction
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    • v.30 no.2
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    • pp.97-104
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    • 2018
  • The safety evaluation of horizontal and vertical bolted connection between PHC piles is presented. The numerical analysis model is constructed using the commercial finite element program, ABAQUS, in which 3D solid element is used to model all the connection devices. The actual bolted connection is idealized by the contact and tie condition given in ABAQUS. Through the finite element analysis, the compression, tensile, bending and shear behaviors of PHC pile connection were analyzed. The safety factor based on Von-Mises and yield stress was calculated for the safety evaluation of each connection devices.

The Study on the Fire Safety Plans by a Field the Actual Condition Analysis of Traditional Temples - With Special Reference to Eunpyeonggu Seoul - (전통사찰의 현장실태분석을 통한 소방안전대책에 관한 연구 - 서울특별시 은평구를 중심으로 -)

  • Song, Yun-Suk;Hyun, Seong-Ho;Kim, Wan-Seop
    • Fire Science and Engineering
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    • v.22 no.5
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    • pp.137-147
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    • 2008
  • This study has investigated fire safety rules related with traditional temples and main fire causes and cases to traditional temples among traditional wooden buildings so has analyzed fire vulnerability, and through a field probe of three traditional temples in Eunpyeonggu Seoul which have cultural properties, has analyzed geographical conditions, going out path spot reaching time required of a fire brigade, fire protection system, fire prevention administration and security system, factors of fire vulnerability, and has presented about fire safety plans of traditional temples.