Circulation characteristics of a natural-circulation loop in a large-scale model for a weakly boiling reactor

1985 ◽  
Vol 58 (3) ◽  
pp. 182-186
Author(s):  
N. S. Al'ferov ◽  
A. S. Babykin ◽  
B. F. Balunov ◽  
V. V. Vakhrushev ◽  
V. S. Kuul' ◽  
...  
Keyword(s):  
Large Scale ◽  
Natural Circulation ◽  
Circulation Loop ◽  
Scale Model ◽  
Natural Circulation Loop ◽  
Large Scale Model ◽  
Boiling Reactor ◽  
Circulation Characteristics

Pulsational characteristics of the natural-circulation loop of a large-scale model of a light-boling boiling-water reactor

1985 ◽  
Vol 58 (4) ◽  
pp. 265-271 ◽  
Author(s):  
A. S. Babykin ◽  
B. F. Balunov ◽  
T. S. Zhivitskaya ◽  
E. L. Smirnov ◽  
V. I. Tisheninova ◽  
...  
Keyword(s):  
Large Scale ◽  
Natural Circulation ◽  
Boiling Water ◽  
Circulation Loop ◽  
Scale Model ◽  
Boiling Water Reactor ◽  
Water Reactor ◽  
Natural Circulation Loop ◽  
Large Scale Model

scholarly journals Large Scale Experiments Representing a Containment Natural Circulation Loop during an Accident Scenario

2018 ◽  
Vol 2018 ◽  
pp. 1-12 ◽  
Author(s):  
R. Kapulla ◽  
G. Mignot ◽  
S. Paranjape ◽  
M. Andreani ◽  
D. Paladino
Keyword(s):  
Large Scale ◽  
Natural Circulation ◽  
Phase 1 ◽  
Hydrogen Release ◽  
Circulation Loop ◽  
Mitigation Measures ◽  
Normal Operation ◽  
Circulation Flow ◽  
Small Aperture ◽  
Natural Circulation Loop

The assessment of hydrogen release, distribution, and mitigation measures in the containment of a nuclear power plant is increasingly based on code calculations. These calculations require state-of-the-art experiments to benchmark the codes against them. Two of these experiments are presented in this paper. These experiments were conducted in the PANDA facility (Switzerland) in the framework of the OECD/NEA HYMERES project. The experiments consider natural circulation flow in a two-room type containment where flow loops can form between the inner and the outer zones. During normal operation these zones are separated and in the case of an accident they become either connected by the opening of rupture disks, convective foils, and dampers or connected by bursting of doors and opening of other connections between compartments. For the experiments considered here one lower PANDA-vessel represents the steam generator (SG) tower and the inaccessible area whereas the other vessel represents the outer room area. The lower vessels are isolated from one another except for a small aperture that represents the damper. The two upper vessels—representing the containment dome—are connected to the lower vessels through tubes. The scenario consisted of four phases. In phase 1, a high steam mass flow rate was injected in the vessel representing the SG tower. After the relaxation phase 2, helium (representing hydrogen) was injected in the same vessel (phase 3). Finally in phase 4 no active interventions were done until the end of the test. Two tests were conducted to evaluate the developing helium transport by the natural circulation flow: one with and one without damper (by closing the aperture). The results showed that a two-room containment (TRC) mixing scenario can be well represented with the PANDA facility. It is found that, with the mixing damper open, a global natural circulation loop develops over all four vessels, whereas with closed damper the natural circulation loop is established only between the three vessels representing the inner zone and the upper dome. It is shown that the presence of the damper has a strong effect on the resulting helium content in the inner zone with 3 times less helium at the end of the test compared with the configuration without damper. The formation of a stable helium stratification in the upper vessels was observed in the presence of the open damper.

RANCANG BANGUN PERANGKAT EKSPERIMENTASI PROSES PIROLISIS BIOMASA GELOMBANG MIKRO

2013 ◽  
Vol 14 (2) ◽  
Author(s):  
Noor Fachrizal
Keyword(s):  
Large Scale ◽  
Continuous Model ◽  
Biomass Energy ◽  
Scale Model ◽  
Small Scale ◽  
Laboratory Apparatus ◽  
Liquid Form ◽  
Large Scale Model ◽  
Bio Oil ◽  
Pyrolysis Of Biomass

Biomass such as agriculture waste and urban waste are enormous potency as energy resources instead of enviromental problem. organic waste can be converted into energy in the form of liquid fuel, solid, and syngas by using of pyrolysis technique. Pyrolysis process can yield higher liquid form when the process can be drifted into fast and flash response. It can be solved by using microwave heating method. This research is started from developing an experimentation laboratory apparatus of microwave-assisted pyrolysis of biomass energy conversion system, and conducting preliminary experiments for gaining the proof that this method can be established for driving the process properly and safely. Modifying commercial oven into laboratory apparatus has been done, it works safely, and initial experiments have been carried out, process yields bio-oil and charcoal shortly, several parameters are achieved. Some further experiments are still needed for more detail parameters. Theresults may be used to design small-scale continuous model of productionsystem, which then can be developed into large-scale model that applicable for comercial use.

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