Special Section Papers

How Thick Should Cover Layer be for Radioactive Waste Disposal Facility? The Case of the Yamin Plain, Israel

[+] Author and Article Information
Avraham Dody

Nuclear Research Center—Negev,
P.O.B. 9001,
Beer Sheva 84190, Israel;
Environmental Research Department,
Ben Gurion University of the Negev,
Beer Sheva 8499000, Israel
e-mail: dodik@post.bgu.ac.il

Ravid Rosenzweig

Geological Survey of Israel,
Malkhe Israel Street 30,
Jerusalem 95501, Israel
e-mail: rravid@gsi.gov.il

Ran Calvo

Geological Survey of Israel,
Malkhe Israel Street 30,
Jerusalem 95501, Israel
e-mail: rani.calvo@gsi.gov.il

Eyal Shalev

Geological Survey of Israel,
Malkhe Israel Street 30,
Jerusalem 95501, Israel
e-mail: eyal@gsi.gov.il

Manuscript received July 13, 2016; final manuscript received December 4, 2016; published online May 25, 2017. Assoc. Editor: Ilan Yaar.

ASME J of Nuclear Rad Sci 3(3), 030908 (May 25, 2017) (5 pages) Paper No: NERS-16-1071; doi: 10.1115/1.4035405 History: Received July 13, 2016; Revised December 04, 2016

Two main natural processes which control the migration of radioactive contaminants to the biosphere were studied in the Yamin Plain in order to evaluate the thickness of a cover layer needed for near-surface radioactive waste disposal facility. The first is the natural erosion of the cover layer, and the second is the infiltration during rain and runoff events. The erosion rate of the soil surface was studied by optical stimulation luminescence technique. It was found that during the last 14,000 years, the erosion rate was 0.3 mm/y which are 3 m for 10,000 years. The infiltration depth assessment was based on water content measurements and numerical modeling. It shows that under the most extreme rain event having an equivalent rain of 84 mm, infiltration depth was limited to 4.5 m. Taking into account the two processes, the effective cover layer thickness over 10,000 years should be at least 7.5 m thick.

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Fig. 1

Schematic 2D cross section of the Hazeva Group and the two natural processes considered

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Fig. 2

The location of Yamin Plain in the NE Negev (ITM coordinates)

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Fig. 3

Two-dimensional schematic illustration of the FTDR in the study area

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Fig. 4

Water fluxes specified at the top boundary of the model over a 1 year period. Positive fluxes represent precipitation, whereas negative fluxes represent evaporation.

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Fig. 5

Erosion rate based on OSL technique along four inactive terraces of one of the Efe tributary in YP [26]

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Fig. 6

Water contents measured following a 48 mm rain event taking place between the 18th and the 21st of February 2015. Rain intensities (a) and measured water contents in FTDR A (b) and B (c).

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Fig. 7

Modeled profiles of water content throughout the year for (a) sand and (b) loam. Details of the modeled rain events are given in Table 3.




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