Chemical Processing Department Monthly Report: July 1957 Page: 76 of 107
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Research and Engineering HW-51802I
Prior to the July shutdown, precycle upsets caused a peak in gamma activity in
the 100 of 3400 uc/gal; however, the activity level soon returned to a normal
1700-1800 uc/gal. Alkaline-permanganate washing (0.01 M lMn04 - 5 per cent
Na2C03) of the 100 during plant shutdown further reduced the gamma activity to
800 uc/gal. Despite this low solvent activity at startup, samples indicated
the 100 immediately increased rapidly to 5400 uc/gal. Accelerated carbonate
wash changes and centrifuge cleanouts, coupled with the use of both centrifuges,
slowly reduced the gamma activity of the solvent to 2600 uc/gal. Incomplete
cleanout of the G3 organic centrifuge, after the alkaline-permanganate solvent
washing, now appears to have been responsible for the unusual activity surge.
Both solvent treatment systems functioned without operational difficulties during
the month. The gamma activity of the 200 ranged from 14 to 37 uc/gal and the
overall solvent losses were 0.37 per cent of the solvent throughput. Nitric acid
flushing of accumulated "crude" from the Second Solv-rt Treatment System resulted
in the removal of 1.6 per cent of a day's plutonium production.
Processing of solvent extraction wastes was normal in the Waste Treatment and
Acid Recovery sections of the plant. Waste volumes sent to the 241-A Tank
Farm were 144, 393, 26 and 210 gallons per ton of uranium processed for neut-
ralized IWW, solvent washes, centrifuge cleanouts and cell drainage, respect-
ively. Coating wastes equivalent to 290 gallons per ton were stored in 241-C
Tank Farm. The high solvent wash volume reflects the special batch washing of
solvent and the equipment flushing during shutdown. Overall waste losses for
the month were 0.88 and 0.26 per cent for plutonium and uranium, respectively.
Coating waste losses for plutonium and uranium amounted to 9 and 31 per cent,
respectively, of the overall loss.
After the second attempt to process three successive batches of HAF containing
about 1700 gallons of 2WW again resulted in excessive HCW plutonium losses (up
to 0.9 per cent), 2WW backcycle was discontinued until additional laboratory
information is available.
Self -concentration has commenced in TK-241-A-101, and all Purex wastes except
coating removal are now routed into this tank. The current boil-off rate is
three gallons per minute. A self -concentration plant study program centering
around 241-A-103 tank,which is evaporating water at a rate of 9.1 gallons per
minute, involves the following phases:
(a) determination of the tank temperature profile,
(b) monitoring for NO and NO2,
(c) exposure of corrosion coupons within the tank vapor space,
(d) routine liquid and vapor phase sampling, and
(e) incremental increase in sodium ion concentration toward 9.0 M.
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Hanford Atomic Products Operation. Chemical Processing Department. Chemical Processing Department Monthly Report: July 1957, report, August 22, 1957; Richland, Washington. (https://digital.library.unt.edu/ark:/67531/metadc1312193/m1/76/: accessed May 25, 2019), University of North Texas Libraries, Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.