Inscrição na biblioteca: Guest
Portal Digital Begell Biblioteca digital da Begell eBooks Diários Referências e Anais Coleções de pesquisa
Multiphase Science and Technology
SJR: 0.183 SNIP: 0.483 CiteScore™: 0.5

ISSN Imprimir: 0276-1459
ISSN On-line: 1943-6181

Multiphase Science and Technology

DOI: 10.1615/MultScienTechn.v20.i3-4.30
pages 265-289

SPONTANEOUS WATER HAMMERS IN A STEAM LINE IN THE CASE OF COLD WATER INGRESS

H.-M. Prasser
Department of Mechanical and Process Engineering (MAVT), Swiss Federal Institute of Technology (ETHZ), ML K 13, Sonneggstrasse 3, 8092 Zürich, Switzerland
Gy. Ezsol
KFKI-AEKI Budapest, PO Box 49, H1525 Budapest 114, Hungary
G. Baranyai
KFKI-AEKI Budapest, PO Box 49, H1525 Budapest 114, Hungary
T. Suhnel
Forschungszentrum Dresden Rossendorf, e.V., PO Box 510119, 01314 Dresden, Germany

RESUMO

Some of the accident scenarios discussed for the Russian type pressurized water reactors VVER-440 assume an overfeed of the secondary side of the steam generators by water coming either from the primary side or from the feedwater system. This may happen, for example, in the case of a leakage from the primary to the secondary side, as well as during earthquakes, and can lead to water ingress into the main steam lines, where condensation-induced water hammer may be the consequence. The present work was initiated to study this phenomenon experimentally. For this purpose, the PMK-2 test facility of KFKI-AEKI Budapest, an integral thermohydraulic model of a VVER-440/W213, was extended by a steam-line model, which is equipped with a novel two-phase flow instrumentation as well as fast pressure and strain-gauge transducers. The applied mesh sensor developed by Forschungszentrum Dresden Rossendorf allows a visualization of the transient flow section during the water hammers. Local void probes detect the propagation of slugs along the pipe. The applied new kind of probe is equipped with microthermocouples to provide local instantaneous temperature measurements along with phase detection. This allows assessing temperature gradients at the boundary between the water and steam. The paper describes the test facility and the new instrumentation. The results of the first tests are presented and discussed. The work is part of the WAHALoads project, which was performed within the fifth EU framework program. The objective of the project was to improve the prediction of loads on equipment and support structures of nuclear power plants that are caused by water hammers and shock waves.


Articles with similar content:

WATER HAMMER INDUCED BY FAST-ACTING VALVES: EXPERIMENTAL STUDIES AT PILOT PLANT PIPEWORK
Multiphase Science and Technology, Vol.20, 2008, issue 3-4
A. Bergant, H.-M. Prasser, A. Apostolidis, A. Dudlik
COLLISION AND REFLECTION WAVES IN A SHOCK TUBE
Proceedings of the 24th National and 2nd International ISHMT-ASTFE Heat and Mass Transfer Conference (IHMTC-2017), Vol.0, 2017, issue
Priyankan Datta, Nirmal Kumar Manna, Nirmalendu Biswas, Satyaki Pradhan
Edge Detection Technique to Measure High Temperature transient sagging under Severe Heatup
Proceedings of the 25th National and 3rd International ISHMT-ASTFE Heat and Mass Transfer Conference (IHMTC-2019), Vol.0, 2019, issue
Deb Mukhopadhyay, Andallib Tariq, Prasanna Majumdar, Ankit R. Singh, Pradeep Kumar Sahoo
STATUS OF ATHLET-CD DEVELOPMENT SHOWN BY THE LOFT-FP-2-ANALYSIS AS AN EXAMPLE
ICHMT DIGITAL LIBRARY ONLINE, Vol.9, 1995, issue
J. Bestele, K. Trambauer
COUNTERCURRENT GAS-LIQUID FLOW IN A BOILING WATER REACTOR CORE DURING POSTULATED LOSS-OF-COOLANT ACCIDENTS
Dynamics of Two-Phase Flows, Vol.1, 1988, issue
Y. Katoaoka, H. Suzuki, S. Hatamiya , M. Murase