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Research Papers

Integrated Chemical Effects Head Loss Experiments Using Multiconstituent Fibrous Debris Beds

[+] Author and Article Information
Daniel LaBrier

Department of Nuclear Engineering,
University of New Mexico,
Albuquerque, NM 87131-0001
e-mail: dlabrier@unm.edu

Amir Ali

Department of Nuclear Engineering,
University of New Mexico,
Albuquerque, NM 87131-0001
e-mail: amirali@unm.edu

Kerry J. Howe

Department of Civil Engineering,
University of New Mexico,
Albuquerque, NM 87131-0001
e-mail: howe@unm.edu

Edward D. Blandford

Department of Nuclear Engineering,
University of New Mexico,
Albuquerque, NM 87131-0001
e-mail: edb@unm.edu

Manuscript received November 12, 2015; final manuscript received August 4, 2016; published online December 20, 2016. Assoc. Editor: Brian Ikeda.

ASME J of Nuclear Rad Sci 3(1), 011006 (Dec 20, 2016) (14 pages) Paper No: NERS-15-1228; doi: 10.1115/1.4034569 History: Received November 12, 2015; Accepted August 04, 2016

The chemical head loss experiment (CHLE) program has been designed to acquire realistic material release and product formation in containment under post-loss of coolant accident (LOCA) conditions and their impact on the measured head loss through the use of modified debris beds developed at the University of New Mexico (UNM). A full-scale water chemistry test was conducted under Vogtle containment chemistry conditions to determine the release of these materials and the resulting head loss response of the formed products within the emergency core cooling system (ECCS) under prototypical chemical conditions. The test was designed to investigate material corrosion with the presence of excess aluminum and a nonprototypical temperature profile (80 °C for 120 h) to promote the production of aluminum precipitates. The head loss measured within the first 72 h of the test either surpassed the operational limits of the equipment or caused a failure within the system. The increase in head loss is not attributed to the formation of in situ precipitates but to a physical reaction of the epoxy used in constructing the debris beds to the local chemistry during the early stages of the test.

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References

Figures

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Fig. 1

Corrosion head loss experiment (CHLE) facility: (a) photograph and (b) schematic diagram

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Fig. 2

Corrosion material rack (a) and fiber baskets (b) for the T7 test

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Fig. 3

CHLE T7 temperature profile: designed (red) versus actual (blue)

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Fig. 4

Head loss data for T7 test, all columns

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Fig. 5

Debris beds formed in Columns 1 (a), 2 (b), and 3 (c), prior to the connection to CHLE tank

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Fig. 6

Head loss for T7 test, up to 24 h

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Fig. 7

Head loss for T7 test, between 24 and 72 h

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Fig. 8

Columns 1 (a), 2 (b), and 3 (c) after disconnection from CHLE tank

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Fig. 9

Debris beds from T7 test: (a) Column 1 and (b) Column 2

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Fig. 10

Column 1 debris beds: (a) top; (b) middle; and (c) bottom (all SEM images, 5000×)

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Fig. 11

Samples of epoxy clumps (a) and epoxy- and TSP-loaded fiber (b) after 85°C borated solution tests

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Fig. 12

Raw untested brown (a), raw untested white (b), and 50∶50 mixture of epoxy exposed to 85°C boric acid (c) (all SEM images, 1000×)

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Fig. 13

SEM images for epoxy/fiber sample from borated TSP-buffered solution: (a) 100×; (b) 500×; and (c) 1000×

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Fig. 14

Turbidity profile for the first 24 h of the T7 test

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Fig. 15

Turbidity profile for the total duration of the T7 test

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Fig. 16

pH data for the T7 test

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Fig. 17

Concentration of aluminum in solution during the T7 test

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Fig. 18

Comparison of zinc and aluminum concentrations during the T7 test

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Fig. 19

Zinc concentration during the first 24 h of the T7 test

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Fig. 20

Comparison of zinc concentration with turbidity during the first 24 h of the T7 test

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Fig. 21

Concentration of calcium in solution during the first 24 h of the T7 test

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Fig. 22

Concentration of calcium in solution for the duration of the T7 test

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Fig. 23

Concentration of magnesium in solution during the T7 test

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Fig. 24

Comparison of calcium and magnesium during the T7 test

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Fig. 25

White deposition on galvanized steel coupons (a) and black deposition on aluminum coupons (b)

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Fig. 26

Black deposition on submerged fiber inventory

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Fig. 27

SEM images (1000×) for aluminum: (a) untested; (b) clean tested; and (c) black residue

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Fig. 28

SEM Images (1000×) for submerged galvanized steel: (a) untested; (b) clean; (c) scale; and (d) flake

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