Use of Simplified Nuclear Power Plant Simulator

Simplified nuclear power plant simulator is a tool for simulating normal, abnormal and emergency operation of a nuclear power plant. The nuclear power plant with two loop pressurized water reactor and with inverted U-bend steam generators and dry containment system is considered. One loop with the pressurizer is modeled separately from the other loop without it. The model deals with 138 main input parameters related with the plant parameters such as pressures, temperatures, levels, power, setpoints, concentrations, capacities, masses and dimensionless numbers. The initial conditions contain 110 parameters. 18 initiating events from the set of internal initiating events can be considered. The objective of the work is to show the applicability of the simplified nuclear power plant simulator for modelling of the selected scenarios from a set of selected design basis accidents for the education purposes. Selected initiating events and scenarios have been identified and the data about them was collected. The simulation of the scenarios was performed. The initial conditions have been determined and the operational characteristics were modelled in sense to timely model plant automatic actuations and manual actions of plant operators. The results have been obtained in sense of time dependent curves of the main parameters of interest for showing the state of the plant itself and its systems and subsystems. The obtained results have been compared with the results of other simulations. The differences and the similarities have been discussed. The comparison of the results with some measurements and mostly with other simulations shows some degree of similarity and some differences, which differ among the parameters of interest. In general, the resulted comparisons show acceptability of simulator for education purposes

Use of Simplified Nuclear Power Plant Simulator

Simplified nuclear power plant simulator is a tool for simulating normal, abnormal and emergency operation of a nuclear power plant. The nuclear power plant with two loop pressurized water reactor and with inverted U-bend steam generators and dry containment system is considered. One loop with the pressurizer is modeled separately from the other loop without it. The model deals with 138 main input parameters related with the plant parameters such as pressures, temperatures, levels, power, setpoints, concentrations, capacities, masses and dimensionless numbers. The initial conditions contain 110 parameters. 18 initiating events from the set of internal initiating events can be considered. The objective of the work is to show the applicability of the simplified nuclear power plant simulator for modelling of the selected scenarios from a set of selected design basis accidents for the education purposes. Selected initiating events and scenarios have been identified and the data about them was collected. The simulation of the scenarios was performed. The initial conditions have been determined and the operational characteristics were modelled in sense to timely model plant automatic actuations and manual actions of plant operators. The results have been obtained in sense of time dependent curves of the main parameters of interest for showing the state of the plant itself and its systems and subsystems. The obtained results have been compared with the results of other simulations. The differences and the similarities have been discussed. The comparison of the results with some measurements and mostly with other simulations shows some degree of similarity and some differences, which differ among the parameters of interest. In general, the resulted comparisons show acceptability of simulator for education purposes

Ocena współczynników ważności elektrowni w ramach oceny niezawodności systemu elektroenergetycznego

The objective of the paper is to develop the reliability importance factors which could identify the plants, which more or less contribute to the increased or decreased power system reliability. One group of importance factors could identify the plants, which with their increased availability would notably increase the power system reliability The other group of the importance factors could identify the plants, which with their reduced availability would notably reduce the power system reliability. The importance factors have been developed. An example of regional power system was considered for the case study. The results identify the power plants which are more susceptible to increase of the loss of load expectation and thus to decreasing of the power system reliability, if their availability is reduced. Similarly, the results identify the power plants which are more susceptible to decreasing of the loss of load expectation and thus to increase of the power system reliability, if their availability is increased. The lists of important factors can serve as a standpoint for inclusion of the power system reliability role within the power system to the planning activities. The lists of importance factors can represent the standpoint for the power system operator to reward the improvement of the power plant availability or to penalize the reduced power plant availability.Celem artykułu jest opracowanie współczynników ważności niezawodności, pozwalających identyfikować elektrownie, które w mniejszym lub większym stopniu przyczyniają się do zwiększenia lub zmniejszenia niezawodności systemu elektroenergetycznego. Opracowano dwie grupy takich współczynników: jedne – służące do identyfikacji elektrowni, które przy zwiększonej gotowości mogą znacznie zwiększać niezawodność systemu elektroenergetycznego, i drugie – do identyfikacji tych elektrowni, których zmniejszona gotowość może znacznie zmniejszać niezawodność sieci elektroenergetycznej. Jako studium przypadku rozważano przykład regionalnego systemu elektroenergetycznego. Wyniki pozwalają na wskazanie elektrowni, które są bardziej podatne na zwiększenie oczekiwanego czasu deficytu mocy (niepokrycia zapotrzebowania), a tym samym mogą bardziej przyczyniać się do zmniejszenia niezawodności systemu elektroenergetycznego, w przypadku spadku ich gotowości. Podobnie, uzyskane wyniki pozwalają ustalić, dla których elektrowni prawdopodobieństwo zmniejszenia oczekiwanego czasu deficytu mocy jest większe, a tym samym, które elektrownie mogą bardziej przyczyniać się do zwiększenia niezawodności systemu elektroenergetycznego, gdy zwiększy się ich gotowość. Listy współczynników ważności mogą służyć jako punkt odniesienia dla działań planistycznych, a także jako podstawa dla operatora systemu elektroenergetycznego do nagradzania poprawy gotowości elektrowni lub penalizacji jej spadku

The Price of Risk Reduction: Optimization of Test and Maintenance Integrating Risk and Cost

International Conference N N Nu u uc c cl l le e ea a ar r r E E En n ne e er r rg g gy y y f f fo o or r r N N Ne e ew w w E E Eu u ur r ro o op p pe e e 2 2 20 0 00 0 09 9 9 Bled / Slovenia / September 14-17 ABSTRACT The primary purpose of surveillance testing and maintenance (T&M) is to assure the reliability of standby safety systems and components in nuclear power plants. The optimal schedule of safety equipment outages due to testing and maintenance is one of the parameters of the plant safety. Early optimizations of single component test intervals were based on minimizing the risk without cost considerations. However, the appropriate development of T&M strategy depends not only on the T&M intervals but also on the resources (human and material) available to implement such strategies. Since these testing and maintenance activities are associated with substantial cost, they present an important domain, where risk reduction and costs can be balanced. The objective of this paper focuses on assessing how the costs may affect the T&M optimization. The costs are expressed as a function of the selected risk measure. The timeaveraged function of the selected risk measure is obtained from probabilistic safety assessment, i.e. the fault tree analysis at the system level, extended with inclusion of time parameters. The testing strategy sequential versus staggered is compared. Results of case study analysis have shown that relatively high system unavailability reduction is gained on the account of relatively low total T&M costs increase. The contribution of component aging to risk is, in general, negligible

Proceedings of the 31th European Safety and Reliability Conference - ESREL 2021

https://www.rpsonline.com.sg/proceedings/9789811820168/index.htmlInternational audienceThis book contains close to 600 abstracts of the scientific and industry contributions from the 31st European Safety and Reliability Conference – ESREL 2021 –, held in Angers, France and organised by Université d'Angers and the European Safety and Reliability Association (ESRA). The full papers are published as Open Access papers on the following website: http://esrel2021.org/en/index.html.For more than 30 years now, ESREL has been one of the key annual events for meetings and knowledge exchange in order to innovate for a better control of risks, and safety and optimization of the performance of socio-technological systems. The Conference has become well established in the international community, attracting a good mix of academic and industry participants that present and discuss subjects of interest and application across various industries in the fields of Safety, Reliability and Risk.This conference comes to France for the fifth time (in addition to an earlier one in 1989 in La Baule). The last edition organized in France was in 2011 in Troyes. Université d'Angers can be seen as a young university (we celebrate its 50th anniversary this year) with a very long history (it was created in 1364 by King Charles V and recognized by the Pope in 1436). It trains more than 23,000 students and delivers more than 402 degrees in more than 100 specialties. Polytech Angers, the engineering school of Université d’Angers has developed undergraduate and graduate programs in quality, reliability and safety engineering and risk management.This year the theme of the Conference is "Guaranteeing in an accelerating world". The Conference covers a number of topics within safety, reliability and risk, and provides a forum for presentation and discussion of scientific papers covering theory, methods and applications to a wide range of sectors and problem areas.This year, the Conference programme includes a total of 593 communications (454 full-papers and 139 abstracts) from prestigious authors coming from all over the world, and selected by the Technical Programme Committee to guarantee the quality and the consistency of the program.The review process was mainly organised by the Technical Area Coordinators (most of which are the Chairmen of the ESRA Technical Committees) and the review process was made by a large number of anonymous reviewers which are gratefully acknowledged for their contributions to the improvement of quality of the papers. The members of the Technical Programme Committee (most of them members of the ESRA Technical Committees) have shared a great part of the review process and are important contributors to the Conference organization

Proceedings of the 31th European Safety and Reliability Conference - ESREL 2021

https://www.rpsonline.com.sg/proceedings/9789811820168/index.htmlInternational audienceThis book contains close to 600 abstracts of the scientific and industry contributions from the 31st European Safety and Reliability Conference – ESREL 2021 –, held in Angers, France and organised by Université d'Angers and the European Safety and Reliability Association (ESRA). The full papers are published as Open Access papers on the following website: http://esrel2021.org/en/index.html.For more than 30 years now, ESREL has been one of the key annual events for meetings and knowledge exchange in order to innovate for a better control of risks, and safety and optimization of the performance of socio-technological systems. The Conference has become well established in the international community, attracting a good mix of academic and industry participants that present and discuss subjects of interest and application across various industries in the fields of Safety, Reliability and Risk.This conference comes to France for the fifth time (in addition to an earlier one in 1989 in La Baule). The last edition organized in France was in 2011 in Troyes. Université d'Angers can be seen as a young university (we celebrate its 50th anniversary this year) with a very long history (it was created in 1364 by King Charles V and recognized by the Pope in 1436). It trains more than 23,000 students and delivers more than 402 degrees in more than 100 specialties. Polytech Angers, the engineering school of Université d’Angers has developed undergraduate and graduate programs in quality, reliability and safety engineering and risk management.This year the theme of the Conference is "Guaranteeing in an accelerating world". The Conference covers a number of topics within safety, reliability and risk, and provides a forum for presentation and discussion of scientific papers covering theory, methods and applications to a wide range of sectors and problem areas.This year, the Conference programme includes a total of 593 communications (454 full-papers and 139 abstracts) from prestigious authors coming from all over the world, and selected by the Technical Programme Committee to guarantee the quality and the consistency of the program.The review process was mainly organised by the Technical Area Coordinators (most of which are the Chairmen of the ESRA Technical Committees) and the review process was made by a large number of anonymous reviewers which are gratefully acknowledged for their contributions to the improvement of quality of the papers. The members of the Technical Programme Committee (most of them members of the ESRA Technical Committees) have shared a great part of the review process and are important contributors to the Conference organization

Proceedings of the 31th European Safety and Reliability Conference - ESREL 2021

https://www.rpsonline.com.sg/proceedings/9789811820168/index.htmlInternational audienceThis book contains close to 600 abstracts of the scientific and industry contributions from the 31st European Safety and Reliability Conference – ESREL 2021 –, held in Angers, France and organised by Université d'Angers and the European Safety and Reliability Association (ESRA). The full papers are published as Open Access papers on the following website: http://esrel2021.org/en/index.html.For more than 30 years now, ESREL has been one of the key annual events for meetings and knowledge exchange in order to innovate for a better control of risks, and safety and optimization of the performance of socio-technological systems. The Conference has become well established in the international community, attracting a good mix of academic and industry participants that present and discuss subjects of interest and application across various industries in the fields of Safety, Reliability and Risk.This conference comes to France for the fifth time (in addition to an earlier one in 1989 in La Baule). The last edition organized in France was in 2011 in Troyes. Université d'Angers can be seen as a young university (we celebrate its 50th anniversary this year) with a very long history (it was created in 1364 by King Charles V and recognized by the Pope in 1436). It trains more than 23,000 students and delivers more than 402 degrees in more than 100 specialties. Polytech Angers, the engineering school of Université d’Angers has developed undergraduate and graduate programs in quality, reliability and safety engineering and risk management.This year the theme of the Conference is "Guaranteeing in an accelerating world". The Conference covers a number of topics within safety, reliability and risk, and provides a forum for presentation and discussion of scientific papers covering theory, methods and applications to a wide range of sectors and problem areas.This year, the Conference programme includes a total of 593 communications (454 full-papers and 139 abstracts) from prestigious authors coming from all over the world, and selected by the Technical Programme Committee to guarantee the quality and the consistency of the program.The review process was mainly organised by the Technical Area Coordinators (most of which are the Chairmen of the ESRA Technical Committees) and the review process was made by a large number of anonymous reviewers which are gratefully acknowledged for their contributions to the improvement of quality of the papers. The members of the Technical Programme Committee (most of them members of the ESRA Technical Committees) have shared a great part of the review process and are important contributors to the Conference organization