Research Papers: Fluid-Structure Interaction

Instrumentation Development and Validation for an Experimental Two-Phase Blowdown Facility

[+] Author and Article Information
Ouajih Hamouda

Department of Mechanical Engineering,
McMaster University,
Hamilton, ON L8S 4L7, Canada
e-mail: hamoudo@mcmaster.ca

David S. Weaver

Fellow ASME
Department of Mechanical Engineering,
McMaster University,
Hamilton, ON L8S 4L7, Canada
e-mail: weaverds@mcmaster.ca

Jovica Riznic

Fellow ASME
Canadian Nuclear Safety Commission (CNSC),
Ottawa, ON K1P 5S9, Canada
e-mail: jovica.riznic@canada.ca

1Corresponding author.

Contributed by the Pressure Vessel and Piping Division of ASME for publication in the JOURNAL OF PRESSURE VESSEL TECHNOLOGY. Manuscript received August 3, 2015; final manuscript received January 13, 2016; published online February 23, 2016. Assoc. Editor: Tomomichi Nakamura.

J. Pressure Vessel Technol 138(3), 031304 (Feb 23, 2016) (13 pages) Paper No: PVT-15-1176; doi: 10.1115/1.4032650 History: Received August 03, 2015; Revised January 13, 2016

An experimental facility was designed and built to study the loading on steam generator tubes during a blowdown. The facility used refrigerant R-134a and measurements were taken for static and dynamic pressures as well as tube loading and temperatures. Commissioning experiments indicated that the off-the-shelf dynamic pressure transducers and load cells could not take the mechanical and thermal shock loading caused by the blowdown and produced spurious results of no value. This paper presents the instrumentation problems found, explains why they occurred, describes the remedial procedures employed, and outlines the instrumentation validation methodologies developed. The success of the instrumentation development is demonstrated in a series of experiments designed to assess the rapid transient measurement system.

Copyright © 2016 by ASME
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Fig. 1

Experimental apparatus for simulating a steam generator blowdown

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Fig. 4

Axial thrust loading due to sudden disk rupture: (a) t = 0 and (b) t = 0+

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Fig. 3

Spurious dynamic load measurements on the tube bundle during commissioning

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Fig. 2

Sample erroneous transient pressure measurement during commissioning

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Fig. 8

Fine wire thermocouple assembly configuration

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Fig. 9

Dynamic load measurement design

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Fig. 10

Test section tube bundle dynamic load calibration curve

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Fig. 12

Comparison of computed wave propagation timings with blowdown pressure measurements

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Fig. 13

Comparison of the measured and computed saturation temperatures and pressures during R-134a post blowdown two-phase equilibrium conditions

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Fig. 14

Comparison of the original and modified test section designs with no tube bundle

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Fig. 11

Comparison of theoretical N2 vessel discharge pressure with actual blowdown measurement

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Fig. 7

Vibration isolated dynamic pressure during N2 commissioning test

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Fig. 6

Output response of the dynamic pressure transducers dipped gently into a container of ice water with and without a layer of insulation coating applied

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Fig. 5

Prototype device for pressure transducer isolation: photograph (top) and mounting configuration (bottom)




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