Results 131 to 140 of about 375 (173)
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Analysis of natural circulation phenomena in VVER-1000
Nuclear Engineering and Design, 2004In all light water reactors (LWR), natural circulation is an important passive heat removal mechanism. In the present paper, the natural circulation phenomena are studied with reference to step-wise coolant inventory reduction and a small break loss-of-coolant-accident (SBLOCA) in the cold leg of VVER-1000.
MOUSAVIAN S. K. +2 more
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Characterization of Gamma Flux in VVER-1000 Internals
Journal of Nuclear Engineering and Radiation ScienceAbstract Accurate prediction of gamma flux in reactor internals is essential for structural assessments studies. This paper presents gamma spectrum measurements in a VVER-1000 full-scale mock-up at the LR-0 reactor, using a stilbene scintillator connected to the NGA-01 spectrometer.
Tomáš Czakoj +2 more
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2002
IAEA needed a rugged spent fuel attribute tester, SFAT, for verifying spent fuel assemblies of the Ukrainian VVER-1000 reactors in line with IAEA safeguards measurement standards and criteria of verification. Spent fuel verification using the existing Improved Cerenkov Viewing Device is becoming more and more difficult and sometimes impossible ...
Tiitta, Antero +8 more
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IAEA needed a rugged spent fuel attribute tester, SFAT, for verifying spent fuel assemblies of the Ukrainian VVER-1000 reactors in line with IAEA safeguards measurement standards and criteria of verification. Spent fuel verification using the existing Improved Cerenkov Viewing Device is becoming more and more difficult and sometimes impossible ...
Tiitta, Antero +8 more
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Automatic Modeling of VVER-1000 Power Maneuvers
Atomic Energy, 2018A special version of the IR code is described. The purpose of this code is to generate recommendations for the reactor operator when operating in a maneuvering regime, automate boron regulation, and study the maneuvering characteristics of VVER-1000 fuel loads.
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Mechanical Properties Distribution in Welds and Forging of VVER-1000
Volume 6: Materials and Fabrication, Parts A and B, 2009Study of weld metal and shell metal of VVER-1000 reactor is carried out. Metal of the control welded joint performed to the welds Nos. 3 and 4 and metal of the test ring of supporting shell is used. For each of the analyzed materials the bending tests of Charpy specimens are carried out according to the surveillance specimens testing procedure ...
Anna A. Chernobaeva +5 more
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VVER 1000 Khmelnitskiy benchmark analysis calculated by Serpent2
Annals of Nuclear Energy, 2017Abstract This paper presents results obtained by reproducing a VVER-1000 lattice physics benchmark using the Serpent2 code. The benchmark data are related to the initial cycles of the Khmelnitskiy nuclear power plant. This study compares results obtained with the Serpent2 code against those calculations published in the benchmark document.
Ondrej Novak +3 more
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VVER-1000 radial reflector modeling by diffusion nodes
Progress in Nuclear Energy, 2006The two commonly used approaches to describe the VVER radial reflectors in diffusion codes, by core-reflector albedos and by a ring of diffusion assembly size nodes, are discussed. The advantages and disadvantages of the first approach are presented first, then the Koebke's equivalence theory is outlined and its implementation for the VVER radial ...
Petkov, P. T., Mittag, S.
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Diagnostics of VVER-1000 Coolant Temperature Pulsations
Atomic Energy, 2019The temperature pulsations arising in coolant flow at the entry into FA are examined from the standpoint of the possibility of their diagnostics by thermocouples of the protective-tube block are examined. It is shown that the temperature pulsations remain in the FA and can be recorded at the exit from FA by means of the in-reactor monitoring system ...
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VVER 1000 Pressurizer System and Control Modelling in Dymola
Volume 9: Student Paper Competition, 2018The pressurizer is responsible for controlling the pressure and temperature in the primary circuit of the nuclear power plant. It is basically a pressure vessel, filled partially with water and partially with steam at saturation state. The controlling process can be described by two regimes, either by the self-control regime or by the automatic control
Anna Fořtová, Filip Ježek
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Scaling of Small Break LOCA in VVER 1000 System
2005This paper deals with the problem of scaling complex scenario measured experimental facilities and replicated by the use of Cathare2 code. ‘Kv-scaled’ calculation an important role in the frame of the “on-transient qualification” of the nodalization owing the procedure envisaged at Pisa University) and to evaluate the importance oe scale-distortions in
CHERUBINI M +3 more
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