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Research Papers

European Project “Supercritical Water Reactor–Fuel Qualification Test”: Results of Fuel Pin Mock-up Tests

[+] Author and Article Information
Radek Novotný

European Commission, Joint Research Centre, Institute for Energy and Transport,
Westerduinweg 3, 1755 LE Petten, The Netherlands
e-mail: Radek.Novotny@ec.europa.eu

Dirk Visser

NRG,
Westerduinweg 3, 1755 LE Petten, The Netherlands
e-mail: visser@nrg.eu

Theo Timke

European Commission, Joint Research Centre, Institute for Energy and Transport,
Westerduinweg 3, 1755 LE Petten, The Netherlands
e-mail: Stefan.Ripplinger@ec.europa.eu

Aleš Vojáček

Centrum Výzkumu Řež,
Husinec-Řež, čp. 130, 25068 Řež, Czech Republic
e-mail: Ales.Vojacek@ujv.cz

Otakar Frýbort

Centrum Výzkumu Řež,
Husinec-Řež, čp. 130, 25068 Řež, Czech Republic
e-mail: fro@cvrez.cz

Jan Siegl

Faculty of Nuclear Sciences and Physical Engineering, Czech Technical University Prague,
Trojanova 13, 120 00 Praha 2, Czech Republic
e-mail: Jan.Siegl@fjfi.cvut.cz

Petr Haušild

Faculty of Nuclear Sciences and Physical Engineering, Czech Technical University Prague,
Trojanova 13, 120 00 Praha 2, Czech Republic
e-mail: Petr.Hausild@fjfi.cvut.cz

Jan Macák

Power Engineering Department,
Institute of Chemical Technology,
Technická 3, 166 28 Praha 6, Czech Republic
e-mail: Jan.Macak@vscht.cz

1Corresponding author.

Manuscript received May 31, 2015; final manuscript received January 21, 2016; published online June 17, 2016. Assoc. Editor: Thomas Schulenberg.

ASME J of Nuclear Rad Sci 2(3), 031008 (Jun 17, 2016) (10 pages) Paper No: NERS-15-1107; doi: 10.1115/1.4032636 History: Received May 31, 2015; Accepted January 21, 2016

The main target of the EURATOM FP7 project “fuel qualification test for supercritical water-cooled reactor” was to make significant progress toward the design, analysis, and licensing of a fuel assembly cooled with supercritical water (SCW) in a research reactor. Within the project, fuel pin mock-ups of a future fuel qualification test facility were designed and manufactured by Centrum Výzkumu Řež (CVR). Following that, it was decided to conduct three different types of tests considering two possible accident scenarios. Simulation of loss of external pressure was the target of Test 1. The autoclave was depressurized as fast as possible from 20 to 1 MPa by opening the close valve located behind the cooling part of the high-pressure part of the loop. Pressure inside the pin was held at a constant value of 20 MPa by pumping high-pressure water via the pin and in parallel via a separate relief valve that was connected directly to the pin using the filling pressure tube. A similar approach was chosen when the opposite case, i.e., loss of internal pressure in the pin, was simulated in Test 2A. Eventually, Test 2A was repeated with modified setup to determine the lower limit of the internal pin pressure (i.e., collapse/buckling of the pin due to external overpressure) more accurately. The presented paper summarizes the results of all three performed tests.

FIGURES IN THIS ARTICLE
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Copyright © 2016 by ASME
Topics: Pressure , Fuels
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References

Figures

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Fig. 1

Design technical drawing of the fuel pin mock-ups including the wire wrap

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Fig. 2

Fuel pin mock-up setup was adapted to fit into one of the JRC IET SCW autoclaves

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Fig. 3

Schematic drawing of the fuel pin mock-up setup used in Tests 2A and 2B including in situ deflection measurement provided by LVDT

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Fig. 4

Schematic drawing of internal pressure ppin control system used in Tests 1A and 1B as well as Test 2A

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Fig. 5

Schematic drawing of the pressure-adjusting loop

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Fig. 6

Image of one of the fuel pin mock-ups, CT scan area, and weld position

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Fig. 7

APROS simulation of fuel pin depressurization due to LOCA calculated by Schulenberg et al. [2] within SCWR FQT project

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Fig. 8

Plots of pressure and temperature recorded within the LOCA simulation: (a) Test 1A and (b) Test 1B

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Fig. 9

Radiographic two-dimensional (2D) X-ray image of the fuel pin mock-up 1 taken after the depressurization test

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Fig. 10

Result of the posttest CT defect analysis using the “Default” algorithm in 3D side and top view of (a, c) upper weld and (b, d) lower weld regions

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Fig. 11

Plot of pressure and temperature recorded within Test 2A

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Fig. 12

Radiographic 2D X-ray image of the fuel pin mock-up 2 taken after completing Test 2A

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Fig. 13

Plots of pressure and displacement recorded within (a) Step 1 and (b) Step 2 of Test 2B

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Fig. 14

Plots of pressure and displacement recorded within Step 5 of Test 2B for fuel pin mock-up 3

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