Tamás János Katona

Prof. Dr. Tamás János Katona

University of Pecs, Pécs, Baranya, Hungary
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Academic Career Length

45Years (1982-Present)

(Calculated once Scilit publication data is synced: current year − year of first publication + 1)

Representative Publications

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1 January 1982 in Progress in Nuclear Energy
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Journal Article
Closed access
TKTamás János Katona
Tamás János Katona
LML. Meskó
L. Meskó
GPG. Pór
G. Pór
JVJ. Valkó
J. Valkó
1 May 1998 in Nuclear Engineering and Design
Verified
Journal Article
Closed access
AHA.L. Halbritter
A.L. Halbritter
NKN.J. Krutzik
N.J. Krutzik
ZBZ. Boyadjiev
Z. Boyadjiev
TKTamás János Katona
Tamás János Katona
1 September 2011 in Acta Geodaetica et Geophysica Hungarica
Verified
Journal Article
Closed access
EGE. Győri
E. Győri
LTL. Tóth
L. Tóth
ZGZ. Gráczer
Z. Gráczer
TKTamás János Katona
Tamás János Katona
Low velocity surface layers can significantly increase ground accelerations during earthquakes. When saturated sandy sediments are present, because of pore pressure increase, decrease of soil strength or even liquefaction can occur. Some volume change follows the dissipation of excess pore pressure after the earthquake resulting surface settlements. To determine the liquefaction probability and post-liquefaction settlement is very important for critical facilities e.g. for the site of Paks Nuclear Power Plant, Hungary. Pore pressure increase and so the liquefaction and surface settlements depend on the characteristics of seismic loading and soil parameters. To quantify the extent of these phenomena is rather difficult. Uncertainties arise both from the probabilistic nature of the earthquake loading and from the simplifications of soil models as well. In the paper, the most important semi-empirical and dynamical effective stress methods for liquefaction and post-liquefaction settlement assessment are summarized. Most significant contributors to the uncertainties are highlighted, and particular examples through the investigation of Paks NPP site are given. Finally, a probabilistic procedure is proposed where the uncertainties will be taken into account by applying a logic tree methodology. At the same time, the uncertainties are reduced by the use of site-specific UHRS and stress reduction factors.
18 May 2023 in Energies
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TKTamás János Katona
Tamás János Katona
ÁBÁgnes Biro
Ágnes Biro
SRSándor Rátkai
Sándor Rátkai
Most WWER-440 reactors are operated over the planned operational lifetime of 30 years. Now, the owners/operators are preparing for the second phase of extending the operation. The paper presents an overview of the most important aspects of ageing of the main components of the WWER-440-type reactors based on the operational and ageing management experiences and primary research efforts supporting the operation. The paper aims to demonstrate that the expectations for the operability of these reactors for up to 60–70 years are realistic. The scope of the review is limited to the ageing of the reactor pressure vessel, vessel internals, and steam generator, which are the lifetime-limiting components besides the containment structure. Some of the corrective actions, improvements of in-service inspections, maintenance, and ageing management are also considered in the paper. It is shown that the selection of materials and unavoidable material degradation processes do not limit the operation of the WWER-440 reactors for up to 60–70 years under the established operational environment and ageing management practice.
3 August 2021 in Applied Sciences
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TKTamás János Katona
Tamás János Katona
LTLászló Tóth
László Tóth
EGErzsébet Győri
Erzsébet Győri
Permanent ground displacements/deformations caused by earthquakes can seriously challenge the safety of the nuclear power plants. The state-of-the-art hazard analysis methods provide a fault displacement hazard curve, i.e., the annual probability of given measure of displacement will be exceeded. The evaluation of ground displacement hazard requires great effort, empirical evidence, and sufficient data for the characterization of the fault activity and capability to cause permanent surface displacement. There are practical cases when the fault at the site area revealed to be active, and, despite this, there are no sufficient data for the evaluation of permanent ground displacements hazard and for judging on the safety significance of permanent ground displacement. For these cases, a methodology is proposed that is based on the seismotectonic modelling and results of the probabilistic seismic hazard analysis. The method provides conservative assessment of the annual probability of fault displacement that allows the decision whether permanent displacement hazard is relevant to nuclear power plant safety. The feasibility and applicability of the method is demonstrated for the Paks site, Hungary.
26 July 2025 in Energy and Buildings
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Journal Article
Open access
TFTwana Fattah
Twana Fattah
DMDaryan Mohammed
Daryan Mohammed
TKTamás János Katona
Tamás János Katona
BBBálint Baranyai
Bálint Baranyai