LAW Radioactive Coupon CO{sub 2} Decontamination Test

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The objective of this test is to confirm that CO{sub 2} blasting is capable of effectively removing smearable contamination from the external surface of the Immobilized Low Activity Waste(ILAW) stainless steel container after glass pouring. The smearable contamination level limits specified in the approved test specification are: (1) 367 Bq/m{sup 2} (220 dpm/100 cm{sup 2}) alpha and 3670 Bq/m{sup 2} (2202 dpm/100 cm{sup 2}) beta-gamma (qualification limits); and (2) 100 dpm/100 cm{sup 2} alpha and 1000 dpm/100 cm{sup 2} beta-gamma (design limits). The removal of smearable contamination from radioactively contaminated coupon was demonstrated by varying the following operating parameters: Nozzle ... continued below

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82 pages

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May, C.G. January 30, 2004.

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Description

The objective of this test is to confirm that CO{sub 2} blasting is capable of effectively removing smearable contamination from the external surface of the Immobilized Low Activity Waste(ILAW) stainless steel container after glass pouring. The smearable contamination level limits specified in the approved test specification are: (1) 367 Bq/m{sup 2} (220 dpm/100 cm{sup 2}) alpha and 3670 Bq/m{sup 2} (2202 dpm/100 cm{sup 2}) beta-gamma (qualification limits); and (2) 100 dpm/100 cm{sup 2} alpha and 1000 dpm/100 cm{sup 2} beta-gamma (design limits). The removal of smearable contamination from radioactively contaminated coupon was demonstrated by varying the following operating parameters: Nozzle standoff distance; Blast air pressure; Pellet rate; and Nozzle travel speed. Coupons were weighed before and after blasting to determine if the CO{sub 2} blasting process removed measurable amounts of surface material from the coupons. High-speed photography was used to capture images of the pellets exiting the blast nozzle as a means of estimating pellet shape and velocity at the blast nozzle. Bleeding tests were performed to determine if fixed contamination remaining on coupons after blasting ''bleeds out'' and measures as smearable contamination under typical storage conditions and times. The bleeding tests consisted of storing blasted coupons with no detectable smearable contamination for a period of 92 days at 95 F. Coupons were removed at 23-day intervals and re-evaluated for smearable contamination. The radioactive coupon blasting tests consisted of four main subtasks: (1) Coupon preparation; (2) CO{sub 2} blasting; (3) High-speed photography; and (4) Bleeding tests.

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82 pages

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  • Other Information: PBD: 30 Jan 2004

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  • Report No.: WSRC-TR-2003-00084, Rev. 0 SRT-RPP-2002-00282, Rev. 0
  • Grant Number: AC09-96SR18500
  • DOI: 10.2172/821204 | External Link
  • Office of Scientific & Technical Information Report Number: 821204
  • Archival Resource Key: ark:/67531/metadc739405

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Reports, articles and other documents harvested from the Office of Scientific and Technical Information.

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Creation Date

  • January 30, 2004

Added to The UNT Digital Library

  • Oct. 18, 2015, 6:40 p.m.

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  • May 5, 2016, 6:05 p.m.

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May, C.G. LAW Radioactive Coupon CO{sub 2} Decontamination Test, report, January 30, 2004; South Carolina. (digital.library.unt.edu/ark:/67531/metadc739405/: accessed December 18, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.