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1

In vessel corium propagation sensitivity study of reactor pressure vessel rupture time with PROCOR platform

Skrzypek E., Skrzypek M., Saas L., Letellier R.

Journal of Power Technologies

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2017

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Vol. 97, nr 2

110--116

EN

The problem of corium propagation for PWRs in the Reactor Pressure Vessel (RPV) and the timing of RPV failure is one of the main issues of study in the area of severe accidents. The PROCOR numerical platform created by the CEA severe accident laboratory is modelling corium propagation for LWRs, its relocation to the Lower Plenum and RPV failure. The idea behind the platform was to provide a tool that is fast enough to be able to perform numerous calculations within a reasonable time frame in order to deliver a statistical study. Work on the development of models that describe in-vessel issues is being pursued through simplified phenomena modelling, their verification and sensitivity studies. Recent activities related to PROCOR development involved cooperation between French CEA experts and Polish PhD students, who were engaged in the topics of core support plate modelling and analysis of the phenomena occurring in a thin metallic layer on top of the corium pool. Those issues were identified as strongly influencing the course of severe accidents and the timing of RPV failure. In some sensitivity studies performed on a given generic high power Light Water Reactor with heavy reflector, two groups of RPV ruptures were distinguished related to the two issues, which provided motivation for further work on these topics. The paper will present a sensitivity study of corium propagation in order to identify the relevance of those two issues for the timing of RPV rupture.

2

Thermal-hydraulic calculations for a fuel assembly in a European Pressurized Reactor using the RELAP5 code

Skrzypek M., Laskowski R.

Nukleonika

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2015

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Vol. 60, No. 3, part 2

537--544

EN

The main object of interest was a typical fuel assembly, which constitutes a core of the nuclear reactor. The aim of the paper is to describe the phenomena and calculate thermal-hydraulic characteristic parameters in the fuel assembly for a European Pressurized Reactor (EPR). To perform thermal-hydraulic calculations, the RELAP5 code was used. This code allows to simulate steady and transient states for reactor applications. It is also an appropriate calculation tool in the event of a loss-of-coolant accident in light water reactors. The fuel assembly model with nodalization in the RELAP5 (Reactor Excursion and Leak Analysis Program) code was presented. The calculations of two steady states for the fuel assembly were performed: the nominal steady-state conditions and the coolant flow rate decreased to 60% of the nominal EPR flow rate. The calculation for one transient state for a linearly decreasing flow rate of coolant was simulated until a new level was stabilized and SCRAM occurred. To check the correctness of the obtained results, the authors compared them against the reactor technical documentation available in the bibliography. The obtained results concerning steady states nearly match the design data. The hypothetical transient showed the importance of the need for correct cooling in the reactor during occurrences exceeding normal operation. The performed analysis indicated consequences of the coolant flow rate limitations during the reactor operation.

3

Computer codes in the safety analysis for nuclear power plants. Computational capabilities of thermal-hydraulic tools, using the example of the RELAP5 code

Skrzypek E., Skrzypek M.

Journal of Power Technologies

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2014

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Vol. 94, nr 5

41--50

EN

Safety is a paramount concern of the Nuclear Power Program in Poland. To this end there is a need to investigate the design of the proposed reactor and its operation principles and perform multiple analyses both before the reactor start-up (The Pre-Construction Safety Report (PCSR) and during its operational life. In the worldwide nuclear community hundreds of people are involved in this complicated and complex process. Due to the sophistication of the phenomena occurring during operation and accidents, the number of analyses is increasing rapidly. Currently, much interest in this field is focused on the use of computer codes and high computational power.

4

Aktualna metoda konstrukcji rozkładu jazdy pociągów

Karoń G., Skrzypek M.

Zeszyty Naukowe. Transport / Politechnika Śląska

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2006

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z. 62

247-256

PL

W artykule przedstawiono aktualną metodę konstrukcji rozkładu jazdy wykorzystującą system RJ - Rozkład Jazdy będący składnikiem systemu SKPZ - Systemu Kierowania Przewozami i Zarządzania Przedsiębiorstwem PKP. Prezentację sposobu pracy z aplikacją KWR (Konstrukcja Wykresu Ruchu - składnik systemu RJ) poprzedzono omówieniem zasad udostępniania infrastruktury kolejowej przez PKP PLK SA prywatnym przewoźnikom. Na koniec zamieszczono uwagi i spostrzeżenia związane z pracą konstruktora wykresu ruchu oraz sugestie poprawy jej efektywności.

EN

Actual method of timetable construction has been presented in this article. This computer aided method use four applications of SKPZ - main system for company managing: KWR - Design of Train Diagram, ESR - Edition of Internal Timetable, OT - Traction Calculation and POS - database of data describing railway infrastructure. Principles of providing access to railway infrastructure have been presented too.

5

Simulations of molecular dynamics of cyanoadamantane multilayers between graphite substrates

Brol P., Pałucha S., Skrzypek M., Gburski Z.

Materials Science Poland

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2005

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Vol. 23, No. 2

483--490

EN

Constant temperature molecular dynamic (MD) simulations have been carried out to investigate structural and dynamical properties of the multilayer of cyanoadamantanes (C10H15CN) located between the graphite substrates. The velocity autocorrelation function and the second range order parameter, for several numbers of layers and temperatures ranging from 100 to 900 K have been calculated. As the number of cyanoadamantane layers increases, the chain structure of cyanoadamantanes is gradually shown up - the consequence of increasing importance of Coulomb interaction of dipolar cyanoadamantane molecules confined between graphite planes.

6

Fullerene layers between graphite walls - A computer simulation

Skrzypek M., Gburski Z.

Materials Science Poland

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2005

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Vol. 23, No. 2

453--456

EN

The properties of ultra thin fullerene layers located between graphite planes have been studied using the molecular dynamics ( MD) technique. In this arrangement, there is competition between the fullerene - fullerene and fullerene - graphite wall interaction potentials - both potentials being very strong. It appears that the confined fullerenes form two ultra thin layers, parallel to the graphite planes. The mean square displacement, velocity autocorrelation function and Lindemann index of fullerene molecule have been calculated for several temperatures and a range of distances between the graphite walls.

7

Depolarized light scattering from a thin fullerene layer confined between graphite planes Molecular dynamics study

Skrzypek M., Brol P., Gburski Z.

Materials Science Poland

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2005

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Vol. 23, No. 2

447--451

EN

The dynamical properties of fullerene clusters, confined between graphite walls, have been investigated by molecular dynamics ( MD) simulation. The fullerene molecules form two monolayers parallel to the graphite walls. The monolayers are quite stable, the migration of fullerene molecules between monolayers has not been observed. The polarizability anisotropy correlation function has been calculated for several separation distances d between the graphite walls. Both the solid and liquid phases of the confined fullerene layers have been detected, depending on the separation distance and the temperature.

8

Wykorzystanie serwera aplikacji w łańcuchach logistycznych

Skrzypek M.

Zeszyty Naukowe Wydziału ETI Politechniki Gdańskiej. Technologie Informacyjne

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2003

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nr 2

563--570

PL

Zaproponowano wykorzystanie serwera aplikacji do usprawnienia procesów związanych z funkcjonowaniem przedsiębiorstwa. Zapewnia to bliższy kontakt z użytkownikami, poprawę jakości obsługi klientów oraz polepszenie współdziałania partnerów łańcucha logistycznego. Przedstawiono dwie główne koncepcje - LIS i LAS oraz podano sposób realizacji logistycznego serwera aplikacji dla wzorcowego przedsiębiorstwa.

EN

Logistics application servers are a new proposition how to use modern information technologies in order to improve functional processes of business. Their utilization leads to closer contacts with users, higher quality of services and better co-operation of partners in a logic chains. Two main concepts are considered: LIS (Logistics Information Systems) and LAS (Logistics Application Servers). The way of LAS implementation for a template business chain is proposed.

9

Ekologistyka stałych odpadów komunalnych

Skrzypek M.

Logistyka

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2002

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R. 32, nr 5

18-20

10

Jakość mikrobiologiczna mleka poddanego procesowi mikrofiltracji i pasteryzacji

Skrzypek J., Cais-Sokolińska D., Pikul J., Skrzypek M.

Przemysł Spożywczy

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2001

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T. 55, nr 11

22-24

PL

Celem pracy było określenie stopnia redukcji mikroflory w odtłuszczonym surowym mleku poddanym procesowi mikrofiltracji i pasteryzacji. W badanym mleku oznaczono ogolną liczbę drobnoustrojów, obecność bakterii z grupy coli i najbardziej prawdopodobną liczbę bakterii beztlenowych. Na podstawie uzyskanych wyników stwierdzono, że mikrofiltracja odtłuszczonego surowego mleka spowodowała redukcję ogólnej liczby bakterii o 99,88%, bakterii z grupy coli o 5 cykli logarytmicznych oraz całkowitą eliminację przetrwalników redukujących siarczyny. Mikrofiltracja i pasteryzacja mleka spowodowała redukcję ogólnej liczby bakterii 99,88% oraz obniżenie bakterii z grupy coli o 6 cykli logarytmicznych.

EN

The aim of the study was to evaluate the reduction of number of microorganisms in skimmed raw milk after microfiltration and pasteurization. Total number of bacteria, number of bacteria of coli group and the most probable number of anaerobic spore forming bacteria were determined. It was found that microfiltration of skimmed raw milk reduced the total number of bacteria by 99,88%, coliform bacteria by about 5 log cycles and completely removed anaerobic spore forming bacteria reducing sulfites. Microfiltration and pasteurization of raw skimmed milk decreased the total number of bacteria by 99,88% and coli forms bacteria by 6 log cycles.

11

Nowe rozwiazania zbiórki i segregacji zużytych opakowań na przykładzie Austrii

Skrzypek M.

Problemy Ekologii

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1999

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R. 3, nr 1

20-27

PL

Przedstawiono działania, których stosowanie doprowadziło w Austrii, a zwłaszcza w Wiedniu, do widocznej poprawy stanu środowiska. Dotyczy to różnych form zbiórki opakowań komunalnych i przemysłowych.

EN

The articles that significantly improved the state of environment in Austria - especially in Vienna - have been presented. It refers to different ways of collecting munipical and industrial wastes.