Radioactive Waste Management Complex low-level waste radiological performance assessment

Maheras, Steven J.; Rood, Arthur S.; Magnuson, S.O.; Sussman, M.E.; Bhatt, R.N.

doi:10.2172/10171987

Cited by 11 publications

(14 citation statements)

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“…After disposal of the irradiated metallic waste at the SDA, corrosion processes can cause these radioactive isotopes to be released to the environment. The current SDA performance assessment (Case et al 2000; see also Maheras et al 1994) and composite analysis (McCarthy et al 2000) postulate that the largest release factor during the corrosion process will be from carbon-14 or other activation products that are released only as the metal corrodes.…”

Section: Objectivesmentioning

confidence: 99%

“…The study compared those estimates to the corrosion rates specified in the SDA performance assessment (Maheras et al 1994), which were based on the IMPACTS study (Oztunali and Roles 1986). The results of the INEEL study by Nagata and Banaee are summarized here.…”

Section: Corrosion In Similar Soilsmentioning

confidence: 99%

“…In the original performance assessment for the SDA (Maheras et al 1994), release rates for a variety of reactor components were obtained using the IMPACTS methodology (Oztunali and Roles 1986) and were based on corrosion rates of 4 mils per year (MPY) (1.02 x 10 -4 m/year) for carbon steel and 0.3 MPY (7.62 x 10 -6 m/year) for stainless steel. The corrosion rates for the stainless steel are rates from the IMPACTS study for austenitic stainless steels (Types 304 and 316) in natural waters and seawater.…”

Section: Introductionmentioning

confidence: 99%

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Long Term Corrosion/Degradation Test Six Year Results

Flitton¹,

Bishop²,

Delwiche³

et al. 2004

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The Subsurface Disposal Area (SDA) of the Radioactive Waste Management Complex (RWMC) located at the Idaho National Engineering and Environmental Laboratory (INEEL) contains neutronactivated metals from non-fuel, nuclear reactor core components. The Long-Term Corrosion/Degradation (LTCD) Test is designed to obtain site-specific corrosion rates to support efforts to more accurately estimate the transfer of activated elements to the environment. The test is using two proven, industry-standard methods-direct corrosion testing using metal coupons, and monitored corrosion testing using electrical/resistance probes-to determine corrosion rates for various metal alloys generally representing the metals of interest buried at the SDA, including Type 304L stainless steel, Type 316L stainless steel, Inconel 718, Beryllium S200F, Aluminum 6061, Zircaloy-4, low-carbon steel, and Ferralium 255. In the direct testing, metal coupons are retrieved for corrosion evaluation after having been buried in SDA backfill soil and exposed to natural SDA environmental conditions for times ranging from one year to as many as 32 years, depending on research needs and funding availability. In the monitored testing, electrical/resistance probes buried in SDA backfill soil will provide corrosion data for the duration of the test or until the probes fail.This report provides an update describing the current status of the test and documents results to date. Data from the one-year and threeyear results are also included, for comparison and evaluation of trends.In the 6-year results, most metals being tested showed extremely low measurable rates of general corrosion. For Type 304L stainless steel, Type 316L stainless steel, Inconel 718, and Ferralium 255, corrosion rates fell in the range of "no reportable" to 0.0002 mils per year (MPY). Corrosion rates for Zircaloy-4 ranged from no measurable corrosion to 0.0001 MPY. These rates are two orders of magnitude lower than those specified in the performance assessment for the SDA.The corrosion on the carbon steel, beryllium, and aluminum were more evident with a clear difference in corrosion performance between the 4-ft and 10-ft levels. Notable surface corrosion products were evident as well as numerous pit initiation sites. Since the corrosion of the beryllium and aluminum is characterized by pitting, the geometrical character of the corrosion becomes more significant than the general corrosion rate. Both pitting factor and weight loss data should be used together. For 6-year exposure, the maximum carbon steel corrosion rate was 0.3643 MPY while the maximum beryllium corrosion rate was 0.3282 MPY and the maximum aluminum corrosion rate was 0.0030 MPY.ii (This page is intentionally left blank.)iii ACKNOWLEDGMENTS

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Section: Objectivesmentioning

confidence: 99%

Section: Corrosion In Similar Soilsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Long Term Corrosion/Degradation Test Six Year Results

Flitton¹,

Bishop²,

Delwiche³

et al. 2004

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show abstract

“…A radiological performance assessment, as required by U. S. Department of Energy Order 425.1, was performed for the SDA (Maheras et al 1994). Since the performance assessment was completed, additional information has been found indicating that the amount of carbon-14 in the waste may be greater than the amount used in the performance assessment.…”

Section: Introductionmentioning

confidence: 99%

Transport Models for Radioactive Carbon Dioxide at RWMC

Hull¹,

Hohorst²

2001

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“…Early versions of the RWMC PA (Maheras et al 1994;Case et al 2000) were based on an erosion rate of 9E-04 m/year, which is aggressive relative to the Keck (1995) studies. If the relatively aggressive erosion rate is used (roughly 1 m [3 ft] in 1,000 years), at least 4 m (13 ft) of cover would remain over a waste profile covered by an initial 15-m engineered barrier.…”

Section: Erosion and Subsidencementioning

confidence: 99%