NachhaltigF: Maschinenbau und MechatronikZeitschriftenartikel
T. Mull, T. Wagner, Giuseppe Bonfigli, S. Buchholz, Frank Schäfer, E. Schleicher, C. Schuster, M. Sporn
Safety cases for design-basis accidents in LWRs featuring passive systems
[In Press]
Nuclear Engineering and Design, no. Available online 26 February 2021
2021
DOI: 10.1016/j.nucengdes.2021.111095
Abstract anzeigen
This paper presents results from a series of integral tests performed at Framatome’s INKA test facility in Karlstein (Germany) which simulates a KERENA boiling water reactor (BWR). The scope of the test series was on the behaviour of and interaction between the different passive systems and components under the conditions of extended loss of alternating power (ELAP). These SBO-like conditions were aggravated in three out of four tests by parallel LOCA (Loss of Coolant Accident). The scenarios of all four tests fully correspond to Design Basic Conditions (DBC). They were: main steam line break, feed water line break, reactor pressure vessel (RPV) bottom leak and station blackout (SBO, non-LOCA).
In the tests, the passive systems integrated in KERENA and INKA, respectively, have fulfilled their design functions fully satisfactorily and as follows:
The Passive Pressure Pulse Transmitter (PPPT) triggered the RPV depressurization without delay. The Emergency Condenser (EC) system removed decay heat along with stored energy from the RPV to the containment. The Containment Cooling Condenser (CCC) system forwarded said power to a heat sink outside of the containment. The passive containment pressure suppression system kept the containment pressure within the design range, partially displacing surplus thermal energy from the drywell to the wetwell, in particular in the early phases after occurrence of LOCA. The passive core flooding system replenished the coolant inventory of the RPV thereby ensuring water levels in the RPV which are fully sufficient for core cooling.
Moreover, the systems have cooperated as anticipated by the designers, quietly and without perturbing each other.
Hence the test results, which are reported and discussed more in detail within this paper, soundly confirm the underlying design and its passive features.
Said tests were carried out as a part of the joint research project EASY (Evidence of Design Basis Accidents Mitigation solely with passive safety Systems), the overarching objective of which was the development and validation of the code system AC2 of GRS (Gesellschaft für Anlagen- und Reaktorsicherheit gGmbH).
DigitalMobilF: Europan Campus Rottal-InnZeitschriftenartikel
de Oliveira Hansen, R. M. D., M. Mátéfi-Tempfli, R. Safonovs, J. Adam, S. Chemnitz, T. Reimer, B. Wagner, W. Benecke, Stefan Mátéfi-Tempfli
Magnetic films for electromagnetic actuation in MEMS switches
Microsystem Technologies, vol. 24, no. 4, pp. 1987-1994
2018
DOI: 10.1007/s00542-017-3595-2
Abstract anzeigen
This paper investigates the fabrication of magnetic films via electroplating to be applied into electromagnetic actuated micro electro-mechanical systems (MEMS) switches. Cobalt and nickel films (1 µm thicknesses) were deposited on gold coated silicon substrates via electrochemical deposition. Different deposition conditions were investigated, regarding temperature and deposition voltage. The films morphologies were characterized via atomic force microscopy, while the magnetic properties of the films were characterized via vibrating sample magnetometer measurements. In order to evaluate the integration of these magnetic films into MEMS switches with low energy consumption, a mathematical model was developed and the results show that these films can be applied into efficient actuation with reduced power dissipation.
NachhaltigF: Maschinenbau und MechatronikBeitrag (Sammelband oder Tagungsband)
Nadine Kaczmarkiewicz, Giuseppe Bonfigli, S. Leyer, T. Wagner
Performance of the Passive Core Flooding System in the Integral Tests of the Project EASY
49. Jahrestagung Kerntechnik / 49th Annual Meeting on Nuclear Technology (AMNT 2018), Berlin , 29. - 30. Mai 2018
2018
Abstract anzeigen
Among nuclear power generation plants, light water reactors are mainly used at present, and are anticipated to be predominant in the future. To improve the light water reactors the development of the LWRs for the next generation is carried out at various organizations. For example, in the USA the Westinghouse AP-1000 is based on proven technology but with an emphasis on passive safety features. The reactor passive core cooling systems include the core makeup tanks system, passive residual heat removal heat exchanger and in-containment refuelling water storage tank. In Russia has been developed the so-called NPP-2006 project of a VVER-1200 nuclear power plant with a V-392M reactor unit. To provide the safety, protection passive systems which don’t depend upon human errors are widely used in this project. Among these are hydrotanks of the second stage and passive heat removal system. In the presented paper an overview of passive core cooling systems for next generation NPPs is given.
NachhaltigF: Maschinenbau und MechatronikBeitrag (Sammelband oder Tagungsband)
S. Buchholz, W. Klein-Hessling, Giuseppe Bonfigli, Nadine Kaczmarkiewicz, N. Neukam, F. Schäfer, T. Wagner
The Code System AC2 for the Simulation of Advanced Reactors within the Frame of the German EASY Project
Proceedings of the 17th International Topical Meeting on Nuclear Reactor Thermal Hydraulics (NURETH-17) [September 3-8, 2017; Qujiang Int’l Conference Center, Xi’an, Shaanxi, China]
2017
NachhaltigF: Maschinenbau und MechatronikBeitrag (Sammelband oder Tagungsband)
S. Buchholz, A. Schaffrath, Giuseppe Bonfigli, Nadine Kaczmarkiewicz, N. Neukam, F. Schäfer, T. Wagner
Evidence of Design Basis Accidents Mitigation Solely with Passive Safety Systems within the Frame of the German EASY Project
Proceedings of the 17th International Topical Meeting on Nuclear Reactor Thermal Hydraulics (NURETH-17) [September 3-8, 2017; Qujiang Int’l Conference Center, Xi’an, Shaanxi, China]
2017
NachhaltigF: Europan Campus Rottal-InnVortrag
Oliveira Hansen, R. M. D., M. Mátéfi-Tempfli, S. Chemnitz, T. Reimer, B. Wagner, Stefan Mátéfi-Tempfli, W. Benecke, H.-G. Rubahn
Electromagnetic actuation in MEMS switches
100% CLIMATE NEUTRALITY Conference, Sønderborg, Denmark
2015
Version: 2.1.2-qf2