• 한국압력기기공학회 논문집
• /
• 제8권2호
• /
• pp.26-32
• /
• 2012

The systems of the nuclear power plant are designed based on the User Requirement Document, and Korea Hydro & Nuclear Power Co. (KHNP) implements preventive maintenance activities to keep the specific design function of the system consistently. To monitor the preventive maintenance effectiveness, KHNP has also developed maintenance effectiveness monitoring (MR) program based on NUMARC 93-01 since 2003, and has implemented the program in all operating plants. Recently, KHNP has upgraded MR programs by reflecting implementing experiences ; reestablishing the performance monitoring level, improving analysis for standby function and performance criteria for passive components, reestablishing the availability performance criteria and the performance criteria for the same type of components. These upgraded MR programs will contribute to enhance safety and improve equipment reliability through monitoring maintenance effectiveness.

• 한국안전학회지
• /
• 제16권2호
• /
• pp.110-116
• /
• 2001

The objective of the Maintenance Rule (MR) is to require monitoring of the overall continuing effectiveness of licensee maintenance programs to ensure that the safety related and certain nonsafety-related SSCs are capable of performing their intended functions. In Korea, as risk informed applications and regulation become active, the necessity of Performance Based Regulation (PBR) has increased. The objective of this article is to study the effectiveness of MR based on performance and feasibility of MR adoption at Korean Nuclear Power Plants (NPPs) for effective maintenance and regulation.

• 한국건축시공학회:학술대회논문집
• /
• 한국건축시공학회 2015년도 추계 학술논문 발표대회
• /
• pp.79-80
• /
• 2015

With the government's support for new and renewable energy, photovoltaic equipment has rapidly been supplied. However, compared to supply rate, maintenance has not supported enough and relevant research has not much conducted. Therefore, the purpose of this study is to analyze maintenance effectiveness of photovoltaic equipment. What is the most important in maintenance effectiveness is a rise in power generation. It was estimated that if photovoltaic equipment for detached houses is maintained well, power generation increases by 4.0% at least, and by 6.5% on average. As a result, it was analyzed that it is necessary to maximize the effectiveness of the government's budget investment through well maintenance of photovoltaic equipment for detached houses.

• 대한교통학회지
• /
• 제21권3호
• /
• pp.23-35
• /
• 2003

본 연구는 항공기 운항에 있어 주요 구성원들인 항공정비사와 조종사들 사이에 내재하고 있는 공유가치나, 양자간의 갈등정도, 영향력이 그들간의 신뢰나 업무만족, 운항성과에 어떠한 영향을 미치는지를 살펴보았다. 분석 결과, 항공정비사와 조종사의 공유가치가 높을수록 신뢰가 높아지며 업무만족도 높아졌다. 또한 그들간의 갈등이 적을수록 신뢰가 높아지며, 업무만족이 높아졌다. 항공정비사와 조종사들간의 영향력이 균형을 이룰수록 신뢰수준과 업무만족 또한 높아졌다. 그리고 신뢰수준과 업무만족의 정도에 따라 운항성과도 달라진 것으로 파악되었다. 이상의 연구결과는 상호업무의존성이 많은 운항업무에서 항공정비사와 조종사가 지각하는 상대방에 대한 태도가 운항성과와 관련이 있음을 제시한다.

• International Journal of Quality Innovation
• /
• 제7권3호
• /
• pp.15-23
• /
• 2006

A spare ordering policy is considered for planned maintenance. Introducing the ordering, uptime, downtime, inventory costs and salvage value, we derive the expected cost effectiveness. The problem is to determine jointly the ordering time for a spare and the preventive replacement time for the operating unit which maximize the expected cost effectiveness. Some properties regarding the optimal policy are derived, and a numerical example is included to explain the proposed model.

• Geomechanics and Engineering
• /
• 제2권3호
• /
• pp.161-176
• /
• 2010

Discrete Element Method (DEM) simulations were developed to investigate the effectiveness of geosynthetic reinforcement and the effectiveness of maintenance techniques performed on a simulated ballast bed subjected to dynamic loading. The results from four samples subjected each one to a total of 425 load cycles are presented: one unreinforced and unmaintained sample, one unmaintained but reinforced sample, one unreinforced sample subjected to maintenance in the form of stoneblowing after 200 load cycles, and one unreinforced sample subjected to maintenance in the form of tamping after 200 load cycles. The obtained values of permanent deformation as a function of the applied number of load cycles for the four cases are presented together allowing a comparison of the effectiveness of each technique. Moreover, snapshots of the simulated track sections are presented at different moments of the simulations. The simulations indicated that the geosynthetic reinforcement may not be beneficial for the analyzed case while stoneblowing was the most effective maintenance technique.

• Nuclear Engineering and Technology
• /
• 제54권4호
• /
• pp.1185-1194
• /
• 2022

The maintenance of condenser main pipe is the key to achieve film-forming amine maintenance effectiveness. In this work, oxygen content, pH and temperature of the solution were controlled to simulate the condition of condenser main pipe, and magnetite coated carbon steel sample was prepared by pre-oxidization. CAM was used to characterize the hydrophobicity of film formed samples. Hydrophobic film was formed on pre-oxidized carbon steel samples when octadecylamine concentration reaches 20 mg/kg. SEM, EDS, EIS, and PD were used to characterize the influence of octadecylamine concentration on maintenance effectiveness. It was found that the maintenance effectiveness was enhanced and the corrosion rate was suppressed with the increase of octadecylamine concentration. FIB and TEM were used to detect the adsorbed octadecylamine film thickness founding that octadecylamine adsorbed onto the surface of pre-oxidized carbon steel by multi-layer adsorption mechanism.

• 산업공학
• /
• 제18권3호
• /
• pp.308-316
• /
• 2005

Delayed repair to the failure of weapon system can cause enormous damages to military operation. Various materials like diagnostic equipment, general and special tools, technical manuals(maintenance manual and illustrated parts breakdown) and drawing documents are required for maintenance. For existing weapon systems the distributed environment of these various materials reduces the maintenance effectiveness of maintenance crew. In this paper, to provide the information of maintenance procedures and supply to the maintenance crew we develope a digital interactive electronic technical manual of the technical documents which can be used easily in computer through question and answer method and improve maintenance effectiveness and minimized repairing time.

• 한국철도학회:학술대회논문집
• /
• 한국철도학회 2008년도 추계학술대회 논문집
• /
• pp.1539-1544
• /
• 2008

기존 연구에서 도어시스템에 대한 중정비가 완전 유지보수가 아닌 불완전 유지보수인 사례가 발표되었다. 불완전 유지보수인 경우에는 유지보수 효과를 고려하여 적절한 유지보수 정책을 수립하여야만 시스템의 신뢰성을 확보하면서 경제적인 유지보수를 수행할 수 있다. 본 연구에서는 전동차량의 승객용도어 시스템(passenger door system:PDS)을 대상으로 중정비의 효과가 불완전할 경우 고려할 수 있는 유지보수 정책의 효율성을 시뮬레이션을 통해 평가함으로써 유지보수 정책을 결정하는데 도움을 주고자 한다.

• 한국압력기기공학회 논문집
• /
• 제8권1호
• /
• pp.25-32
• /
• 2012

Korea Hydro & Nuclear Power Co. (KHNP) has developed and implemented the maintenance effectiveness monitoring (MR) programs for the operating nuclear power plants. The MR program is developed by reflecting design characteristics of the operating nuclear power plants to monitor the plant performance for improving the safety and reliability. Recently, KHNP has built a new nuclear power plant, and developed the MR program to establish the advanced maintenance system by reflecting unique design characteristics based on the OPR1000 standard model. So, the MR program developed in this study has another characteristics in comparison with the OPR1000 standard model, and we will verify the suitability of the MR program through evaluating initial performance of the plant. The safety and reliability of the new plant will be improved by developing and implementing the MR program.