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Research Papers

Numerical Analysis to Investigate the Effects of Thermal-Hydraulic Instabilities on Deterioration Heat Transfer and Wall Temperature in the CANDU Supercritical Water Reactor

[+] Author and Article Information
Goutam Dutta

Electrical and Computer Engineering,
University of Western Ontario (UWO),
London, ON N6A 5B9, Canada
e-mail: gd@iiitdmj.ac.in, gdutta@uwo.ca

Chao Zhang

Mem. ASMEMechanical and Materials Engineering,
University of Western Ontario (UWO),
London, ON N6A 5B9, Canada
e-mail: czhang@eng.uwo.ca

Jin Jiang

Electrical and Computer Engineering,
University of Western Ontario (UWO),
London, ON N6A 5B9, Canada
e-mail: jjiang@eng.uwo.ca

1Corresponding author.

2Visitor from the Discipline of Mechanical Engineering, PDPM Indian Institute of Information Technology, Design and Manufacturing Jabalpur, http://www.iiitdmj.ac.in/index.html.

Manuscript received December 20, 2014; final manuscript received March 17, 2015; published online September 3, 2015. Assoc. Editor: Thomas Schulenberg.

ASME J of Nuclear Rad Sci 1(4), 041011 (Sep 03, 2015) (8 pages) Paper No: NERS-14-1065; doi: 10.1115/1.4030199 History: Received December 20, 2014; Accepted March 25, 2015; Online September 16, 2015

The present work analyzes the thermal-hydraulic behavior of the CANDU supercritical water reactor (SCWR) using a 1-D numerical model. The possibility of a static instability, the Ledinegg excursion, is investigated, which reveals it can occur only in a hypothetical condition, far from the proposed operating regime of the CANDU SCWR. The investigation demonstrates the possibility of density wave oscillations (DWOs), a dynamic instability, in the operating regime of the CANDU SCWR and its marginal stability boundary (MSB) is obtained. The phenomenon of the deterioration in heat transfer is observed, and the related investigation shows that the strong buoyancy effect is responsible for its appearance inside the heating section of the channel of the CANDU SCWR core. The MSB is found to be inadequate in determining the safe operating zone of the reactor because the wall temperature can exceed the allowable limit from metallurgical consideration. The investigations also determine the safe as well as stable zone where the CANDU SCWR should operate in order to avoid the maximum temperature limit and DWOs.

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References

Figures

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Fig. 1

Constructional features of the CANDU SCWR. (a) Schematic diagram [24] and (b) schematic diagram of the pressure tube

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Fig. 2

Pressure drop versus mass flow rate at various steady-state operating conditions. (a) hin=50  kJ/kg, (b) hin=500  kJ/kg, (c) hin=1500  kJ/kg, and (d) hypothetical operating condition

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Fig. 3

MSB of the CANDU SCWR at W=924  kg/s (70% of rated flow rate) and pex=25  MPa

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Fig. 4

Temporal variation of axial wall temperature at W=924  kg/s (70% of rated flow rate), hin=1000  kJ/kg, Q=2226.5  MW (89% of rated power), and pex=25  MPa

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Fig. 5

Axial variation of various buoyancy parameters and pressure gradients at t=0  s. (a) T(z), (b) B*(z) and A*(z), (c) Bu*(z) and k*(z), (d) TR(z), and (e) pressure gradients

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Fig. 6

Axial variation of various buoyancy parameters and pressure gradients at t=20.95  s. (a) T(z), (b) B*(z) and A*(z), (c) Bu*(z) and k*(z), (d) TR(z), and (e) pressure gradients

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Fig. 7

Axial variation of various buoyancy parameters and pressure gradients at t=26.32  s. (a) T(z), (b) B*(z) and A*(z), (c) Bu*(z) and k*(z), (d) TR(z), and (e) pressure gradients

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Fig. 8

Axial wall temperature at various operating conditions. (a) Tw determined by HTCM and (b) Tw determined by HTCS

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Fig. 9

Safe and stable operating zone at W=924  kg/s (70% of rated flow rate) and pex=25  MPa

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Fig. 10

Temporal variation of axial wall temperature at W=924  kg/s (70% of rated flow rate), hin=1400  kJ/kg, Q=1918.6  MW (77% of rated power), and pex=25  MPa

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