Assessment of nuclear safety and nuclear criticality potential in the Defense Waste Processing Facility Page: 4 of 15
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WSRC-RP-93-692, Rev. 0
Nuclear safety issues and potential sources of nuclear criticality
incidents in the DWPF were examined in depth. The discussion
started at the receipt of slurry feeds: the Low Point Pump Pit
Precipitate Tank (LPPPPT) and the Low Point Pump Pit Sludge Tank
(LPPPST), and went through all DWPF processes. The potential for
criticality incidents in the DWPF is minimal, except for the following:
(1) The DWPF Salt Processing Cell (SPC), Chemical Process Cell
(CPC), and Melt Cell (MC). They are being addressed in a DWPF
Technology Issue, T.I. 24.1.
(2) The DWPF process vent and off-gas systems. Documentation of
the reasons why solids accumulation in the vent system in the
DWPF will not pose citicality concerns is required.
(3) Waste Treatment Area. Documentation of fate of solids in the
Recycle Collection Tank (RCT), and in liquid products from the
dissolution of HEME and HEPA spent filter elements in the
Decontamination Waste Treatment Tank (DWTT) is required.
(4) Mercury Purification Cell. Although it is not part of item (1)
above, analysis is required to resolve the Technology Issue T.I.
(5) The Late Wash Facility. The filtration system needs to be
investigated once the design is complete.
The above five issues are also believed to have a minimum potential for
nuclear safety and criticality incidents. However, referenciable
information is needed to more firmly establish the safety of these
A panel of experts in the fields of process engineering, process
chemistry, and safety analysis met together on January 26, 199 7 nd
February 19, 199 o discuss nuclear safety and nuclear critical
potential in the ense Waste Processing Facility (DWPF) processes.
They represent the Defense Waste Processing Technology Section
(DWPT), the Chemical Technology Section (CTS), and the Nuclear
Process Safety Research Section (NPSR) of the Savannah River
Technology Center (SRTC), and the DWPF process engineers. DWPT
is the SRTC section responsible for supporting the DWPF, and is
familiar with the process engineering and process chemistry of the
DWPF processes. CTS supports the SRS separation areas and has
extensive experience with nuclear safety issues related to chemical
processes that are used to process nuclear material. The DWPF
M. J. Plodinec
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Ha, B. C. Assessment of nuclear safety and nuclear criticality potential in the Defense Waste Processing Facility, report, May 10, 1993; Aiken, South Carolina. (https://digital.library.unt.edu/ark:/67531/metadc1390070/m1/4/: accessed April 18, 2019), University of North Texas Libraries, Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.