0
Research Papers

Experimental Study of Aqueous Chemical Trisodium Phosphate-Buffered Environment Under Post-LOCA Conditions With Head Loss Measurements

[+] Author and Article Information
Amir Ali

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

Daniel LaBrier

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

Kerry J. Howe

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

Edward D. Blandford

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

1Corresponding author.

Manuscript received April 13, 2016; final manuscript received August 3, 2016; published online March 1, 2017. Assoc. Editor: Michio Murase.

ASME J of Nuclear Rad Sci 3(2), 021002 (Mar 01, 2017) (12 pages) Paper No: NERS-16-1036; doi: 10.1115/1.4034572 History: Received April 13, 2016; Revised August 03, 2016

An integrated chemical effects test (ICET) was designed and executed to investigate the corrosion of materials in a hypothetical post-loss of coolant accident (LOCA) environment for pressurized water reactors (PWRs) and the resulting effects on the measured head loss in three vertical columns through multiconstituents debris beds. The head loss columns were isolated approximately after 72 h, as the measured head loss in all three columns approached or surpassed the maximum limit of the differential pressure (DP) cells. Additional bench scale tests were carried out to investigate the cause of high head loss in the three columns. Combination of epoxy agglomeration and adhesion to fiber resulted in subsequent blockage of the flow through the debris bed with no chemical precipitation was concluded as the most reasonable cause of high head loss observed in the test. The test continued thereafter up to 30 days as an integrated chemical effects test using the corrosion tank only. The results presented in this article demonstrate trends for zinc, aluminum, and calcium release that are consistent with separate bench scale testing and previous integrated tests conducted under trisodium phosphate (TSP)-buffered post-LOCA environmental conditions. In general, the total and filtered samples showed almost identical concentration of all metals (Al, Ca, Si, and Mg) except zinc which clearly indicate that no precipitation occurred. The release rate and maximum concentrations of the released materials were slightly different than the separate effect testing as a result of different experimental conditions (temperature, surface area-to-water volume ratio) and/or the presence of other metals and chemicals in the integrated test.

Copyright © 2017 by ASME
Your Session has timed out. Please sign back in to continue.

References

Figures

Grahic Jump Location
Fig. 6

Debris beds formed in three columns after connection to CHLE tank

Grahic Jump Location
Fig. 5

Photographs for the debris mixture preparation process

Grahic Jump Location
Fig. 4

Tank flow simulation results: (a) horizontal section A–A and (b) vertical section B–B

Grahic Jump Location
Fig. 3

Designed versus measured temperature profile [10,12]

Grahic Jump Location
Fig. 2

Preparation of tank material spray (left) and submerged (right) racks

Grahic Jump Location
Fig. 1

CHLE facility: (a) schematic and (b) photographs of corrosion tank (left) and head loss columns (right)

Grahic Jump Location
Fig. 7

Head loss for all three columns beginning debris bed loading to time zero

Grahic Jump Location
Fig. 8

Head loss for all three columns, hours −5 through 5

Grahic Jump Location
Fig. 9

Head loss for all three columns, hours −5 through 56

Grahic Jump Location
Fig. 10

Column 2 debris bed at 5000×: top (left) and bottom (right) sections

Grahic Jump Location
Fig. 11

Raw brown (left), raw white (center), and mixture of epoxy exposed to 85 °C boric acid (right)

Grahic Jump Location
Fig. 15

Zinc concentrations (total and filtered samples)

Grahic Jump Location
Fig. 12

Epoxy/fiber sample from borated TSP-buffered solution: 100× (left), 500× (center), and 1000× (right)

Grahic Jump Location
Fig. 13

Measured pH during testing

Grahic Jump Location
Fig. 14

Measured turbidity at tank temperature versus room temperature

Grahic Jump Location
Fig. 16

Photographs and SEM of GS coupons from ((a) and (c)) spray and submerged racks ((b) and (d))

Grahic Jump Location
Fig. 17

Measured and predicted aluminum concentrations in the current test

Grahic Jump Location
Fig. 18

SEM images of spray (top row) and the submerged (bottom row) Al pieces

Grahic Jump Location
Fig. 19

Measured calcium concentrations (total and filtered samples) and Olson et al. [22]

Grahic Jump Location
Fig. 20

Measured silicon concentrations (total and filtered) and CHLE-T6 (total) [13]

Grahic Jump Location
Fig. 21

Measured magnesium concentrations (total and filtered) and CHLE-T6 (total) [13]

Tables

Errata

Discussions

Some tools below are only available to our subscribers or users with an online account.

Related Content

Customize your page view by dragging and repositioning the boxes below.

Related Journal Articles
Related eBook Content
Topic Collections

Sorry! You do not have access to this content. For assistance or to subscribe, please contact us:

  • TELEPHONE: 1-800-843-2763 (Toll-free in the USA)
  • EMAIL: asmedigitalcollection@asme.org
Sign In