Numerical Investigation of On-Power Refueling in a Natural Circulation Boiling Water Reactor

2008 ◽  
Author(s):  
G. V. Durga Prasad ◽  
Manmohan Pandey ◽  
S. K. Pradhan ◽  
S. K. Gupta
Keyword(s):  
Flow Rate ◽  
Reverse Flow ◽  
Natural Circulation ◽  
Boiling Water ◽  
Boiling Water Reactor ◽  
Low Velocity ◽  
Two Phase ◽  
Water Reactor ◽  
Tube Type ◽  
Low Pressures

Most two-phase heat exchangers consist of multiple parallel boiling channels, and studies concerning multi-channel instabilities in boiling systems are of significant interest. The natural circulation boiling water reactor (NCBWR) considered in the present work is a pressure tube type boiling light water cooled and heavy water moderated reactor. The primary heat transport loop, comprising a number of parallel channels, is modeled by RELAP5/MOD3.4. The effects of on-power refueling on the flow rate and stability of the system are investigated. The conditions under which a sustainable flow rate can be maintained during on-power refueling are explored. It is observed that during on-power refueling, a near-stagnation condition or low-velocity reverse flow can occur, the possibility of reverse flow being higher at low pressures and low powers.

Steam drum level dynamics in a multiple loop natural circulation system of a pressure-tube type boiling water reactor

2011 ◽  
Vol 38 (10) ◽  
pp. 2227-2237 ◽  
Author(s):  
Vikas Jain ◽  
P.P. Kulkarni ◽  
A.K. Nayak ◽  
P.K. Vijayan ◽  
D. Saha ◽  
...  
Keyword(s):  
Natural Circulation ◽  
Boiling Water ◽  
Pressure Tube ◽  
Circulation System ◽  
Boiling Water Reactor ◽  
Water Reactor ◽  
Tube Type ◽  
Steam Drum

Study on the stability behaviour of a natural circulation pressure tube type boiling water reactor

2002 ◽  
Vol 215 (1-2) ◽  
pp. 127-137 ◽  
Author(s):  
A.K. Nayak ◽  
P.K. Vijayan ◽  
D. Saha ◽  
V.Venkat Raj ◽  
M. Aritomi
Keyword(s):  
Natural Circulation ◽  
Boiling Water ◽  
Pressure Tube ◽  
Boiling Water Reactor ◽  
Water Reactor ◽  
Stability Behaviour ◽  
Tube Type ◽  
The Stability

TWO-PHASE FLOW INSTABILITIES ANALYSES IN BOILING WATER REACTOR

2016 ◽  
Author(s):  
Antonella Lombardi Costa ◽  
WILMER ARUQUIPA COLOMA ◽  
Antonella Lombardi Costa ◽  
Claubia Pereira ◽  
Maria Veloso ◽  
...  
Keyword(s):  
Two Phase Flow ◽  
Boiling Water ◽  
Flow Instabilities ◽  
Boiling Water Reactor ◽  
Phase Flow ◽  
Two Phase ◽  
Water Reactor

The Startup of the Dodewaard Natural Circulation Boiling Water Reactor—Experiences

1994 ◽  
Vol 107 (1) ◽  
pp. 93-102 ◽  
Author(s):  
Wim H. M. Nissen ◽  
Jaap Van Der Voet ◽  
Jadranko Karuza
Keyword(s):  
Natural Circulation ◽  
Boiling Water ◽  
Boiling Water Reactor ◽  
Water Reactor

Description of Typical Flow Instabilities in the Natural Circulation System

2002 ◽  
Author(s):  
Shengyao Jiang ◽  
Xingtuan Yang ◽  
Youjie Zhang
Keyword(s):  
Natural Circulation ◽  
Great Influence ◽  
Operating Conditions ◽  
Boiling Water ◽  
Flow Instabilities ◽  
Circulation System ◽  
Boiling Water Reactor ◽  
Primary Loop ◽  
Water Reactor ◽  
Test Loop

The experiments were performed on the test loop HRTL-5, which simulates geometry and system design of the 5-MW Nuclear Heating Reactor developed by the Institute of Nuclear Energy Technology, Tsinghua University. Because of the difference of the geometry design and operating conditions between the heating reactor and the boiling water reactor, the flow behavior presents great differences too, some of which haven’t been deeply studied so far. Results show that in heating reactor, sub-cooled boiling, condensation and flashing play an important role on the flow instabilities of the natural circulation system. Correspondingly, geysering instability, flashing instability, and flow excursion are the very typical instabilities occurring in the primary loop of HRTL-5, which are different from those in boiling water reactor conditions. The compressibility of the steam space on the top of the primary loop has also great influence on the instability of the natural circulation system.

Study of a Natural-Circulation Boiling Water Reactor with Passive Safety

1990 ◽  
Vol 92 (2) ◽  
pp. 260-268 ◽  
Author(s):  
Hideo Nagasaka ◽  
Takashi Sato ◽  
Hirohide Oikawa ◽  
Ryoichi Hamazaki ◽  
Kenji Arai ◽  
...  
Keyword(s):  
Natural Circulation ◽  
Boiling Water ◽  
Passive Safety ◽  
Boiling Water Reactor ◽  
Water Reactor
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