Research Papers

An Experimental Study on Head Loss of Prototypical Fibrous Debris Beds During Loss-of-Coolant Accident Conditions

[+] Author and Article Information
Amir Ali

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

Edward D. Blandford

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

1Corresponding author.

Manuscript received April 13, 2015; final manuscript received December 6, 2015; published online June 17, 2016. Assoc. Editor: Tomio Okawa.

ASME J of Nuclear Rad Sci 2(3), 031006 (Jun 17, 2016) (10 pages) Paper No: NERS-15-1056; doi: 10.1115/1.4032439 History: Received April 13, 2015; Accepted January 01, 2016

The United States Nuclear Regulatory Commission (NRC) initiated a generic safety issue (GSI-191) assessing debris accumulation and resultant chemical effects on pressurized water reactor (PWR) sump performance. GSI-191 has been investigated using reduced-scale separate-effects testing and integral-effects testing facilities. These experiments focused on developing a procedure to generate prototypical debris beds that provide stable and reproducible conventional head loss (CHL). These beds also have the ability to filter out chemical precipitates resulting in chemical head loss. The newly developed procedure presented in this paper is used to generate debris beds with different particulate to fiber ratios (η). Results from this experimental investigation show that the prepared beds can provide reproducible CHL for different η in a single and multivertical loops facility within ±7% under the same flow conditions. The measured CHL values are consistent with the predicted values using the NUREG-6224 correlation. Also, the results showed that the prepared debris beds following the proposed procedure are capable of detecting standard aluminum and calcium precipitates, and the head loss increase (chemical head loss) was measured and reported in this paper.

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Fig. 1

Simplified arrangement and description of the hypothesized LOCA inside the containment building

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Fig. 2

Photographs for STP containment sump strainer

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Fig. 3

Chemical head loss testing facility (CHLE): (a) Schematic diagram and (b) photographs

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Fig. 4

Photographs for the debris-mixture preparation process

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Fig. 5

Measured CHL for test #1 in column 1 (η=2)

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Fig. 6

Measured CHL comparison for three different tests in column 1 (η=2)

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Fig. 7

Variation of the measured CHL in the three columns with and without latent dirt (η=13.8)

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Fig. 8

Measured CHL for 5-day testing in column 1(η=2)

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Fig. 9

Approach velocity for 5-day testing in column 1 (η=2)

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Fig. 10

Approach velocity and CHL during sweep test (η=2)

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Fig. 11

Measured versus calculated CHL

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Fig. 12

Chemical head loss as a result of WCAP precipitates (AlOOH, Ca3(PO4)2) prepared with RO water and different order on thin debris bed (η=13.8)

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Fig. 13

Chemical head loss as a result of WCAP precipitates (AlOOH, Ca3(PO4)2) prepared with borated buffered water on thin debris bed (η=13.8)




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