Recently, the importance of project management has increased due to the scale and complexity of the construction projects. Therefore, this study conducted a survey on construction companies and related public institutions to verify the relationship between the role of the Project Management Office(PMO) and PM leadership for project performance. Based on this, the effect of the PMO role on the project performance was identified and the moderating effect of PM leadership was analyzed. As a result, first, the role of the PMO was found to have an influential on the project performance. Second, the PM leadership was verified to has a moderating effect in the relationship between the PMO role and the project performance. The purpose of this study is to analyze the influential of the role of PMO on project performance in the construction industry to suggest the necessity of PMO in the construction industry and the need to adopt PMO in large-scale construction projects and analyze the moderating effect of PM leadership on project performance.

현행 우리나라의 검사제도는 사업장의 자율관리 능력을 고려하지 않고, 설비의 노후화 및 위험도와 무관하게 획일화된 방식으로 적용하여 설비의 안전성을 확보하지 못할 뿐만 아니라 정기 및 자체 검사를 병행하여 많은 불편이 있다. 따라서 사업장의 불편을 해소하고, 설비의 안전성과 신뢰도를 높일 수 있는 위험기반검사(risk based inspection, RBI)를 국내 실정에 적합하게 도입하기 위하여 사업장, 정부 및 관련 기관에서 향후 추진해야할 방향에 대하여 분석하였다. 국내에서 위험기반검사 제도가 정착될 수 있기 위해서는 먼저 법적 근거가 마련되어야 하며, 법적 제도가 마련되면 사업장에서 RBI를 적용 시 이를 검증하고, 관리할 수 있는 인증기구의 설치가 필요하다. 또한 위험기반검사를 수행하는 사업장에 대해서는 공정안전이행수준과 같은 위험기반검사 이행수준평가를 도입하고, 차등 적용하여 사업장을 관리하는 것이 바람직하다.

The likelihood of failure for the stress corrosion cracking (SCC) of caustic cracking, which affect to a risk of facilities, was analyzed through the risk based-inspection using API-581 BRD. We found that SCC of the caustic cracking was occurred above 5 % NaOH concentration, and the technical module subfactor (TMSF) was maximized for above 50 % concentration. The heat traced and monitoring were not sensitive to the TMSF with NaOH concentration and temperature. But the steam out was more of less affect minimum value of the TMSF. Also, the inspection number, the inspection effectiveness, and the year since inspection were very sensitive to the TMSF with NaOH concentration and temperature. Therefore, the plan of next inspection will be established with compositively considering those at once.

The effect of parameters on the consequence of the flash fire accident by the release of heavy gas(in this study, xylene vapor) was analyzed. Simulation results showed that the distance with the lower flammable limit(XLFL) was increased with the increase of the release hole diameter. For the case of the elevated release, XLFL was increased with the increase of the wind speed and the release height, but XLFL was not affected by the wind speed for the release on the ground level. Therefore, the accident in the elevated release was more dangerous than the release on the ground level. In this condition, the release height had more effect on XLFL at the night time than the daytime and in the urban area than the rural area.

The likelihood of failure by the corrosion of high temperature H2S/H2, which affect to a risk of facilities, was analyzed through the risk based-inspection using API-581 BRD. We found that the corrosion rate was increased as temperature and H2S concentration were increased. Also, the technical module subfactor(TMSF) was increased as an used you increased, material thickness decreased, inspection number decreased, and inspection effectiveness increased. In these conditions, the maximum value of TMSF was not varied, but the TMSF was sensitively varied at low temperature for high concentration of H2S.

본 연구는 한국산업안전공단에서 구축한 종합위험관리체제(IRMS)의 추진경과, 운영조직체계, IRMS 효과, 개선사항 및 향후 발전방향 등 IRMS 사업의 전 분야를 재검토하여 문제점에 대한 개선방안과 중 장기 발전방안을 제시하고자 하였다. 이를 위해 IRMS가 구축된 PSM 사업장에 대하여 설문조사를 실시하여 IRMS 효과를 분석하여 문제점을 도출하고, 이를 바탕으로 교육, 조직, 정보공유, 전산화, 기타 부문에서 개선방안을 제시하였다. 또한 선진국의 안전관리 실태를 전망하고, 이를 통하여 IRMS 중 장기 발전방안 수립을 위한 추진방향을 제시하였다.

한국형 위험기반검사 프로그램을 석유화학공장에 적용하여 사업장의 안전관리 이행수준, 공정 위험도 등급 및 분포 및 설비의 손상메카니즘 분포를 산출하였으며, 이를 바탕으로 검사주기 변경으로 설비검사를 수행함으로써 배관의 안전성을 향상시키고, 검사비용을 절감할 수 있었다.

The likelihood of failure for the thinning of high temperature sulfide and naphthenic acid corrosion, which affect to a risk of facilities, was analyzed through the risk based inspection using API-581 BRD. We found that the corrosion rate was increased with increasing temperature and total acid number(TAN). And maximum value of the technical module subfactor(TMSF) was not varied with operating condition, but the TMSF was sensitively changed at the range of low temperature, low flow rate, and high TAN. Also, the TMSF was increased as an used year and inspection effectiveness increased, but it was increased as thickness, inspection number, and over design decreased.

Likelihood of failure for the external corrosion of carbon and low alloy steels, which affect to a risk of facilities, was analyzed quantitatively through the risk based inspection using API-581 BRD. We found that the technical module subfactor (TMSF) decreased as the inspection number increased and it increased as the Inspection effectiveness and the used year increased. In this condition, the TMSF showed high value for the case of the marine/cooling tower drift area as a corrosion driver, poor quality of coating, no insulation, and low insulation condition.

Likelihood of failure (LOF) for the external corrosion of stainless steel, which affect to a risk of facilities, was analyzed quantitatively through the risk based inspection using API-581 BRD. We found that the technical module subfactor (TMSF) decreased as the inspection number increased and it increased as the inspection effectiveness and the used year increased, and that the TMSF showed high value for the case of the marine/cooling tower drift area as a corrosion driver, In this condition, the LOF for the external corrosion of stainless steel had lower than that for the carbon and low alloy steels

Industrial facilities are becoming more complex and various with rapidly developing technologies. A number of installations and equipments are increased to improve productivity, and they are operated under the condition of high temperature and pressure. They are continuously repaired, replaced or abolished because of the deterioration with time, but their repair and replacement are not easy for economical and environmental concerns. If possible, the deteriorating equipments should be inspected and repaired effectively considering the state of maintenance and preservation, economic efficiency, and safety. That's where RBI(Risk Based Inspection) fits in. Even if RBI technology has been known among specialists, there were no tools readily available and it was hard to practice and apply RBI in industrial inspection and safety management. In the development of the qualitative RBI, the overall algorithm adopted API-581 BRD. The qualitative RBI program was developed to search the appling process.

본 연구에서는 계절별 기후인자를 고려하여 정성적 및 정량적 위험성 평가를 실시하여 사고 시나리오를 설정하였고, 비용-편익분석을 실시하여 사고 시나리오별 안전관리 비의 효율을 분석하였다. 그 결과, 최악의 시나리오는 비정상조업에서 유지보수 오류이었고, 가능성 있는 시나리오는 HAZOP 구간#4에서 발생되는 가스 누출사고이었으며, 각 사고 시나리오에서 전체 안전관리 투자비에 대한 편익/비용은 0.043과 0.13이었다. 이때 각 사고 시나리오에서 비용 효과적인 안전관리 항목을 평가할 수 있었다.

For the unconfined vapor cloud explosion accident by the continuous release of gas-liquid flow of various saturated liquids in a vessel at ground level, overpressures were estimated and analyzed with various release conditions and materials by TNT equivalency model with vapor dispersion. We found that at same release conditions, overpressure showed n-heptane > xylene > n-hexane > toluene > n-heptane > benzene, respectively and that overpressure was increased with increasing the hole diameter and the storage pressure, but it was increased with decreasing the wind speed, the interested distance, and the vessel thickness.

Cost-benefit analysis was investigated to propose the analysis method of the effect of investment and the optimum investment level of safety management cost for preventing gas accident in the B governor station. From five classifications of safety management costs consisting of cost items with similar characters and potential accident costs calculated by risk assessments(FMEA/HAZOP), we found that the order of the benefit(the reduction cost of the potential accident cost) was the instrument increase and repair cost > the safety checking and inspection cost > the labor and training cost > the safety equipment and corresponding cost > the research and development cost. As the benefit was increased with increasing the investment cost, the effect of investment was increased with decreasing the Investment cost. As a result, the optimum safety management cost was estimated and the investment level was analyzed by the model of optimum investment level.

The consequence analysis for the unconfined vapor cloud explosion(UVCE) accident by the continuous release of butane vapor was performed and effects of process parameters on consequences were analyzed in standard conditions. For the case of continuous release(87.8 kg/s) of butane vapor at 8 m elevated height in the debutanizing process of tile naphtha cracking plant operating at 877 kPa ＆ 346.75 K, we found that combustion ranges of dispersed vapor estimated by HMP model were 11.2~120.2 m and overpressures estimated by TNT equivalency model at 200 m were about 37.35~55.1 kPa. Also, overpressures estimated by Model UVCE I based on advective travel time to XLFL were smaller than those estimated by Model UVCE IIbased on real travel time between XUFL and XLFL. At the same time, damage intensities at 200 m and effect ranges by overpressure could be predicted. Furthermore, simulation results showed that effects of operating pressures on consequences were larger than those of operating temperatures and results of accidents were increased with increasing operating pressures. At this time, sensitivities of overpressures for UVCE accident by the continuous release were about 5 kPa/atm.