Results 21 to 30 of about 688 (173)

Radiocarbon Measurements Reveal Underestimated Fossil CH4 and CO2 Emissions in London

Geophysical Research Letters, Volume 50, Issue 15, 16 August 2023., 2023
Abstract Radiocarbon (14C) is a powerful tracer of fossil emissions because fossil fuels are entirely depleted in 14C, but observations of 14CO2 and especially 14CH4 in urban regions are sparse. We present the first observations of 14C in both methane (CH4) and carbon dioxide (CO2) in an urban area (London) using a recently developed sampling system ...
Giulia Zazzeri, Heather Graven, Xiaomei Xu, Eric Saboya, Liam Blyth, Alistair J. Manning, Hannah Chawner, Dien Wu, Samuel Hammer   +8 more
wiley   +1 more source

Numerical Evaluation of Coolability Limits of External Reactor Vessel Cooling Using an Improved Thermal‐Hydraulic System Analysis Code

International Journal of Energy Research, Volume 2023, Issue 1, 2023., 2023
The external reactor vessel cooling provides a means to stabilize the molten core inside the reactor vessel during the severe accident in nuclear power plants. For a credible evaluation of the chances of success of in‐vessel melt retention, one requires high‐fidelity predictions on the natural circulation flow around the reactor vessel and, in ...
Yeon-Gun Lee, Il Woong Park, Geng Chen
wiley   +1 more source

Computational benchmark for fuel assembly of VVER-1000 using the Monte Carlo Serpent code [PDF]

Nuclear Technology and Radiation Protection, 2018
The use of a new Monte Carlo Serpent code for the calculation of water-cooled reactors is presented and a calculation scheme of the fuel assembly for VVER-1000 reactors developed.
Galchenko Vitaliy V., Shlapak Ihor, Gulik Volodymyr   +2 more
doaj   +1 more source

Experience of using loose parts monitoring systems at Novovoronezh NPP [PDF]

Nuclear Energy and Technology, 2022
In VVER reactor plants, it is impossible to completely exclude the appearance of loose, loosely fixed and foreign objects in the main circulation circuit.
Alexey V. Voronov, Mikhail T. Slepov
doaj   +3 more sources

Rooppur Nuclear Power Plant: Current Status & Feasibility

Journal of Mechanical Engineering, 2018
In the present world, nuclear energy is a must need for various purposes. The main cause of nuclear energy is because of the increasing energy demand, which is not possible to provide by using convenient energy generation.
Sabhasachi Saha, Koushik Roy, Souvik Roy, Md. Asfakur Rahman, Md. Zahid Hasan   +4 more
doaj   +1 more source

Formation of proliferation-resistant nuclear fuel supplies based on reprocessed uranium for Russian nuclear technologies recipient countries

Nuclear Energy and Technology, 2015
The paper presents different strategies for the conversion of VVER-1000 reactors to reprocessed uranium fuel for estimating the time required to form a proliferation-resistant VVER-1000 fuel load based on uranium extracted from spent fuel of reactors of ...
M.I. Fedorov, A.I. Dyachenko, N.A. Balagurov, V.V. Artisyuk   +3 more
doaj   +1 more source

Estimation influence of boric acid drop entrainment to its accumulation in the VVER reactor in the case of accident [PDF]

Nuclear Energy and Technology, 2018
Process of boric acid mass transfer during accidents accompanied with rupture of circulation pipelines in VVER reactors of new generation equipped with passive safety systems are examined.
Andrej V. Morozov, Anna V. Pityk, Sergej V. Ragulin, Azamat R. Sahipgareev, Aleksandra S. Soshkina, Aleksandr S. Shlyopkin   +5 more
doaj   +3 more sources

A methodology for CHF prediction in VVER rod bundles

Nuclear Engineering and Design, 2022
The critical heat flux (CHF) is an important thermal-hydraulic parameter that must be determined during the design of water-cooled reactors to ensure safety of operation. In this paper, a methodology is proposed to predict the CHF in VVER rod bundles. A whole-reactor model of VVER-1000 is implemented in RELAP-SCDAPSIM, and, based on the bundle-average ...
AbdulHameed, Mohamed, Shaaban, Aly, Gamal, Hussein, Elshahat, Ayah   +3 more
openaire   +2 more sources

Tolerant fuel for VVER reactors

Journal of Physics: Conference Series, 2020
Abstract The main factor of destruction of fuel rods in accidents with loss of coolant is associated with the vapor-zirconium reaction occurring between the fuel rod shell and the coolant (water). Improving the reliability of fuel cells can be obtained by modifying or replacing the fuel shell, materials that do not interact with the ...
A Z Alhmoud, V B Kruglov, A B Kruglov, H A Tanash   +3 more
openaire   +1 more source

Improving the accuracy of thermal power determination of VVER

Ядерна фізика та енергетика, 2019
In most algorithms for forming control signals, locks and protection of VVER, the value of the reactor’s thermal power (RTP) is used. This article is dedicated to the analysis of the problem of determining the RTP of VVER-1000.
V. I. Borysenko, D. V. Budyk, V. V. Goranchuk   +2 more
doaj   +1 more source