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Title: Passive Neutron Non-Destructive Assay for Remediation of Radiological Waste at Hanford Burial Grounds- 13189

The Hanford burial grounds contains a broad spectrum of low activity radioactive wastes, transuranic (TRU) wastes, and hazardous wastes including fission products, byproduct material (thorium and uranium), plutonium and laboratory chemicals. A passive neutron non-destructive assay technique has been developed for characterization of shielded concreted drums exhumed from the burial grounds. This method facilitates the separation of low activity radiological waste containers from TRU waste containers exhumed from the burial grounds. Two identical total neutron counting systems have been deployed, each consisting of He-3 detectors surrounded by a polyethylene moderator. The counts are processed through a statistical filter that removes outliers in order to suppress cosmic spallation events and electronic noise. Upon completion of processing, a 'GO / NO GO' signal is provided to the operator based on a threshold level equivalent to 0.5 grams of weapons grade plutonium in the container being evaluated. This approach allows instantaneous decisions to be made on how to proceed with the waste. The counting systems have been set up using initial on-site measurements (neutron emitting standards loaded into surrogate waste containers) combined with Monte Carlo modeling techniques. The benefit of this approach is to allow the systems to extend their measurement ranges, inmore » terms of applicable matrix types and container sizes, with minimal interruption to the operations at the burial grounds. (authors)« less
Authors:
;  [1] ; ;  [2] ;  [3] ;  [4]
  1. Pajarito Scientific Corporation, 2976 Rodeo Park Drive East, Santa Fe, NM 87505 (United States)
  2. Washington Closure Hanford, 2620 Fermi Ave., Richland, WA 99354 (United States)
  3. ELR Consulting, Inc., 15247 Wilbur Rd., La Conner, WA 98257 (United States)
  4. WorleyParsons Polestar, 601 Williams Blvd., Richland, WA 99354 (United States)
Publication Date:
OSTI Identifier:
22224953
Report Number(s):
INIS-US--13-WM-13189
TRN: US14V0396045908
Resource Type:
Conference
Resource Relation:
Conference: WM2013: Waste Management Conference: International collaboration and continuous improvement, Phoenix, AZ (United States), 24-28 Feb 2013; Other Information: Country of input: France; 4 refs.
Research Org:
WM Symposia, 1628 E. Southern Avenue, Suite 9-332, Tempe, AZ 85282 (United States)
Country of Publication:
United States
Language:
English
Subject:
12 MANAGEMENT OF RADIOACTIVE WASTES, AND NON-RADIOACTIVE WASTES FROM NUCLEAR FACILITIES; 46 INSTRUMENTATION RELATED TO NUCLEAR SCIENCE AND TECHNOLOGY; ALPHA-BEARING WASTES; CONTAINERS; ELECTRIC GROUNDS; FILTERS; FISSION PRODUCTS; MATRICES; MODERATORS; MONTE CARLO METHOD; NEUTRONS; NITRIC OXIDE; NOISE; NONDESTRUCTIVE TESTING; PLUTONIUM; POLYETHYLENES; PROCESSING; REMEDIAL ACTION; SIGNALS; SIMULATION; SPALLATION; URANIUM