Experimental investigation on instability characteristics of loss of heat sink accident in a natural circulation system

2021 ◽  
Vol 155 ◽  
pp. 108143
Author(s):  
Yuqi Lin ◽  
Puzhen Gao ◽  
Xianbing Chen ◽  
Solomon Bello ◽  
Chunping Tian ◽  
...  
Keyword(s):  
Experimental Investigation ◽  
Heat Sink ◽  
Natural Circulation ◽  
Circulation System

Effects of loss of heat sink transient on flow characteristics in a closed natural circulation system

2021 ◽  
Vol 381 ◽  
pp. 111331
Author(s):  
Solomon Bello ◽  
Puzhen Gao ◽  
Samuel Abiodun Olatubosun ◽  
Yuqi Lin
Keyword(s):  
Heat Sink ◽  
Natural Circulation ◽  
Flow Characteristics ◽  
Circulation System

Review and Status of the Gen-IV CANDU-SCWR Passive Moderator Core Cooling System

2008 ◽  
Author(s):  
H. F. Khartabil
Keyword(s):  
Heat Sink ◽  
Cooling System ◽  
Natural Circulation ◽  
Power Level ◽  
Heat Removal ◽  
Circulation System ◽  
The Past ◽  
Test Loop ◽  
Flow Oscillations ◽  
Core Cooling

Enhanced safety is an important priority in the development of Generation IV reactors, which can be accomplished through the use of improved passive heat removal systems. In CANDU® reactors, the separation between the low-pressure moderator and high-pressure coolant provides a unique passive heat sink for decay heat removal during accident scenarios. Methods for enhancing this passive heat sink for the GenIV CANDU-SCWR (supercritical water cooled reactor) have been under investigation for the past several years to support a “no core melt” reactor design concept (1, 2). Initially, to test feasibility, tests and analysis at AECL studied a full-height passive cooling loop and showed that a flashing-driven natural circulation system was possible in principle. However, flow oscillations were observed at low powers and could not be readily explained through analysis. While these oscillations were not considered to be detrimental to the heat removal capability, additional separate-effects experiments were conducted and causal mechanisms proposed for the oscillations. In addition, these separate effects tests suggested that oscillations could be avoided at any power level by suitable design. A new test loop with a more representative geometry was recently constructed and commissioned. Preliminary commissioning tests confirmed conclusions from the separate effects tests. In this paper, the new tests are compared to the past tests to explain the improved and more stable loop operation. This comparison suggests that a complete system coupled to an ultimate heat sink has the potential to improve loop operation even more by eliminating or significantly reducing flow oscillations at low powers. Plans for validating this conclusion will be provided.

PARALLEL-CHANNEL INSTABILITY IN NATURAL CIRCULATION SYSTEM

2006 ◽  
Vol 18 (4) ◽  
pp. 305-333 ◽  
Author(s):  
Mio Hirayama ◽  
Hisashi Umekawa ◽  
Mamoru Ozawa
Keyword(s):  
Natural Circulation ◽  
Circulation System ◽  
Parallel Channel
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