NEUTRON MULTIPLICITY AND ACTIVE WELL NEUTRON COINCIDENCE VERIFICATION MEASUREMENTS PERFORMED FOR MARCH 2009 SEMI-ANNUAL DOE INVENTORY Page: 2 of 9
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Analytical Development SRNL-STI-2009-00302
Savannah River National Laboratory page 1 of 8
Neutron Multiplicity and Active Well Neutron Coincidence Verification
Measurements Performed for March 2009 Semi-Annual DOE Inventory
R. A. Dewberry
Savannah River National Laboratory Analytical Development
K. P. Klapper
Savannah River National Laboratory Actinide Chemical Technology
F. K. Tietze
Savannah River National Laboratory Support
J. C. Ayers
Material Protection, Control, & Accountability
The Analytical Development (AD) Section field nuclear measurement group performed six "best
available technique" verification measurements to satisfy a DOE requirement instituted for the
March 2009 semi-annual inventory.' The requirement of (1) yielded the need for SRNL Research
Operations Department Material Control & Accountability (MC&A) group to measure the Pu
content of five items and the highly enrich uranium (HEU) content of two. No 14Q-qualified
measurement equipment was available to satisfy the requirement. The AD field nuclear group
has routinely performed the required Confirmatory Measurements for the semi-annual inventories
for fifteen years using sodium iodide and high purity germanium (HpGe) y-ray pulse height
analysis nondestructive assay (NDA) instruments.2 With appropriate y-ray acquisition modeling,
the HpGe spectrometers can be used to perform verification-type quantitative assay for Pu-
isotopics and HEU content. The AD nuclear NDA group is widely experienced with this type of
measurement and reports content for these species in requested process control, MC&A booking,
and holdup measurements assays Site-wide.3-6 However none of the AD HpGe y-ray
spectrometers have been 14Q-qualified, and the requirement of reference 1 specifically excluded
a y-ray PHA measurement from those it would accept for the required verification measurements.
The requirement of reference 1 was a new requirement for which the Savannah River National
Laboratory (SRNL) Research Operations Department (ROD) MC&A group was unprepared. The
criteria for exemption from verification were?
" isotope content below 50 grams
" intrinsically tamper indicating or TID sealed items which contain a Category
IV quantity of material
" assembled components
" laboratory samples.
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Dewberry, R.; Ayers, J.; Tietze, F. & Klapper, K. NEUTRON MULTIPLICITY AND ACTIVE WELL NEUTRON COINCIDENCE VERIFICATION MEASUREMENTS PERFORMED FOR MARCH 2009 SEMI-ANNUAL DOE INVENTORY, article, February 5, 2010; South Carolina. (https://digital.library.unt.edu/ark:/67531/metadc929439/m1/2/: accessed April 19, 2019), University of North Texas Libraries, Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.