Reliability analysis of passive systems: An overview, status and research expectations

Olatubosun, Samuel Abiodun; Smidts, Carol

doi:10.1016/j.pnucene.2021.104057

Cited by 17 publications

(5 citation statements)

References 48 publications

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“…It was also shown that the proposed method differed from existing methods in that it used several independent measurement channels (main and backup), which made the received measurement data more reliable compared to the measurement results of the main and backup measuring instruments. Further research will be dedicated to the investigation of approaches to reliability assessment for modern systems from the perspective of different fields of knowledge [20][21][22][23]. The existing methods were used to solve the discussed problems.…”

Section: Discussionmentioning

confidence: 99%

Quality Analysis of Natural Gas Using the Structural Reliability of an Analytical Information System

et al. 2023

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In this study, the authors first attempted to evaluate the efficiency of available systems for natural gas quality analysis using various examples. For this purpose, a model for such gas analysis systems was designed and the structural reliability of these systems were calculated. In the following, the main shortcomings of the existing methods for evaluating the reliability of gas analysis systems were discussed. Finally, a new probabilistic approach for the reliability assessment of such systems was proposed. This approach included a subsystem of measuring instruments that depended on the number of measured parameters. Specifically, it was suitable for measuring a single parameter of a gas mixture, but in order to check its effectiveness, a number of criteria were considered to identify and record system failures. For each criterion, various mathematical equations were constructed for reliability indices, including an operating time distribution function, reliability function, and average time to failure function. Finally, the obtained values and the reliability evaluation of gas analysis systems were discussed. Additionally, the main advantages of using the new method compared to the existing methods were enumerated. Furthermore, instead of assessing the standard structural reliability, a probabilistic assessment of reliability based on the accuracy of measurements was proposed.

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Section: Discussionmentioning

confidence: 99%

Quality Analysis of Natural Gas Using the Structural Reliability of an Analytical Information System

et al. 2023

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“…Sehubungan dengan perkembangan teknologi keselamatan, generasi terbaru PLTN sudah mulai menerapkan sistem keselamatan pasif yang dapat bekerja berdasarkan gravitasi, konveksi, kondensasi, dan sirkulasi alam Juarsa dkk., 2014;Juarsa dkk., 2018). Meskipun secara konseptual sistem keselamatan pasif ini akan jauh lebih andal dari sistem keselamatan aktif, kemungkinan untuk gagal masih tetap ada (Purba, 2013;Olatubosun & Smidts, 2022). Oleh karena itu, kinerja sistem keselamatan pasif ini tetap perlu dievaluasi Buku ini tidak diperjualbelikan.…”

Section: Pendahuluanunclassified

Analisis Keselamatan PLTN Berbasis Probabilitas Fuzzy

Purba¹

2023

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Teknologi PLTN dan teknologi sistem keselamatannya senantiasa berkembang seiring dengan perkembangan ilmu pengetahuan dan teknologi. Meskipun keandalan sistem keselamatan PLTN semakin baik, menihilkan kecelakaan dan risiko tetap tidak mungkin. Oleh karena itu, yang menjadi fokus peningkatan keandalan sistem keselamatan PLTN adalah memperkecil probabilitas kecelakaan dan menurunkan konsekuensi kecelakaan hingga tingkat risiko yang dapat diterima. Untuk dapat memperkirakan besarnya peluang terjadinya kecelakaan dan tingkat risiko dari pengoperasian PLTN maka perlu dilakukan analisis keselamatan probabilistik. Analisis keselamatan probabilistik konvensional memerlukan ketersediaan data kegagalan komponen. Tentunya PLTN yang masih dalam tahap disain atau yang belum pernah beroperasi tidak akan memiliki data kegagalan yang diperlukan. Kondisi ini menyebabkan penggunaan data generik menjadi tak terhindarkan. Hasil analisis dengan menggunakan data generik ini tentu saja tidak akan menggambarkan kondisi nyata dari sistem yang sedang dievaluasi, sehingga kurang tepat dijadikan sebagai bahan pertimbangan untuk meningkatkan keandalan sistem keselamatan. Oleh karena itu dikembangkanlah metode analisis keselamatan PLTN berbasis probabilitas fuzzy untuk mengevaluasi kinerja sistem keselamatan PLTN ketika data kegagalan komponen tidak tersedia. Metode baru ini memanfaatkan keilmuan, pengetahuan dan pengalaman yang dimiliki oleh pakar yang terlibat dalam mendisain dan mengembangkan reaktor tersebut. Metode analisis keselamatan probabilistik berbasis probabilitas fuzzy ini memiliki tiga fitur analisis yaitu analisis pohon kegagalan berbasis probabilitas fuzzy, analisis kritikalitas berbasis probabilitas fuzzy, dan analisis pohon kejadian berbasis probabilitas fuzzy. Untuk memudahkan pengguna, metode yang dikembangkan ini juga dilengkapi dengan perangkat lunak Intelligent Probabilistic Safety Assessment (IntelPSA). Metode analisis ini tentu saja akan memberikan kontribusi saintifik pada pengembangan teknologi keselamatan PLTN. Kontribusi saintifik yang pertama adalah FPPSA dapat menjadi komplemen untuk analisis keselamatan probabilistik konvensional ketika PLTN yang akan dievaluasi tidak memiliki data kegagalan komponen. Kontribusi saintifik yang kedua adalah konsep berpikir yang ditanamkan pada metode baru ini dapat menjadi acuan bagi para peneliti dalam mengembangkan metode analisis baru dengan penggunaan data kualitatif melalui justifikasi pakar berdasarkan keilmuan, pengetahuan dan pengalaman yang dimiliki ketika data kuantitatif tidak tersedia. Untuk aplikasi praktis, para pembuat kebijakan terkait dengan pembangunan dan pengoperasian PLTN pertama di Indonesia dapat mempertimbangkan untuk menggunakan perangkat lunak IntelPSA sebagai alat bantu untuk mengevaluasi keandalan sistem keselamatan PLTN yang dipilih sehingga pakar yang memahami teknologi dan sistem kerja dari reaktor nuklir yang akan dibangun dapat melakukan justifikasi secara kualitatif.

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“…These systems that work based on the principle of natural circulation have unique features and ways of working that are very different from conventional systems, so risk analysis must consider various aspects. Research on passive safety system reliability and performances in nuclear power reactors has been investigated 7–15 . However, the hazard and risk identification of the IPWR RCS is still not clear.…”

Section: Introductionmentioning

confidence: 99%

“…Research on passive safety system reliability and performances in nuclear power reactors has been investigated. [7][8][9][10][11][12][13][14][15] However, the hazard and risk identification of the IPWR RCS is still not clear. Thus, it is necessary to carry out a risk analysis before IPWR is built in Indonesia.…”

mentioning

confidence: 99%

Risk identification of integral pressurized water reactor (IPWR) cooling system using a combination HAZOP, FMEA, and FTA methods

Deswandri,

Sudarno,

Tyas

et al. 2024

Process Safety Progress

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Integral Pressurized Water Reactor (IPWR) is gaining attention for use in Indonesia due to lower initial capital investment, sitting flexibility, and high level of inherent safety. IPWR relies heavily on passive cooling systems that have many advantages but lacks operational experience because no one operates commercially. Therefore, it is necessary to carry out a risk analysis related to passive cooling system failures that may occur during operation. Even if conventional risk analysis methods are applied singularly, the results still have shortcomings. This study aims to integrate the use of the Hazard and Operability Analysis (HAZOP), Fault Tree Analysis (FTA), and Failure Mode and Effect Analysis (FMEA) methods to identify risks in the IPWR primary cooling system during normal operation. HAZOP was used to identify hazards, FTA analyzed the root causes of the critical problems, and the basic event's FMEA was developed for risk ranking and mitigation measures. This combined methodology makes risk assessment more systematic and comprehensive because it manages entity‐wide risk. The results offer valuable insights for stakeholders involved in decision‐making regarding the development of nuclear power plants (NPPs) in Indonesia.

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Reliability analysis of passive systems: An overview, status and research expectations

Cited by 17 publications

References 48 publications

Quality Analysis of Natural Gas Using the Structural Reliability of an Analytical Information System

Quality Analysis of Natural Gas Using the Structural Reliability of an Analytical Information System

Analisis Keselamatan PLTN Berbasis Probabilitas Fuzzy

Risk identification of integral pressurized water reactor (IPWR) cooling system using a combination HAZOP, FMEA, and FTA methods

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