Chemical Processing Department Monthly Report: July 1957 Page: 17 of 107
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to zero the head end SS inventory at least every t months
to re-establish the accountability base.
Self-generated heat in the 241-101-A underground waste storage
tank was sufficient to produce boiling during the month. Salt
wastes were introduced to this tank near the first of June. When
the liquid level in the tank reached the suction of the liquid
recirculators, their use was initiated and a minor "burp" oc-
curred. The rapid boiling was similar to that experienced in
103-A tank when the recirculators were started after a period
of idleness. Boiling in the 241-103-A tank continues at a rate
of about ten gallons per minute.
2. Special Processing
During the scheduled shutdown period an attempt was made to
evaluate the performance of the prototype silver reactor in C
Cell by measuring radio-iodine in the off-gas during dissolution
of metal with a cooling time of 72 - 84 days. Eighteen tons of
this material were charged to the dissolver. During two separate
dissolution periods samples taken at the mid-point and downstream
of the reactor showed insufficient iodine activity for reliable
analysis. During this period 291 stack emissions totaled 0.1 curies
of radio-iodine for the entire plant. Following the plant startup
on July 20, I131 stack emission increased to more than four curies
per day for a tree-day period (July 20 through 22). Inasmuch
as the dissolver off-gae monitors failed to confirm the high emis-
sion rates J'; as assumed that the iodine was released from the
short-cooleu solution via the vessel vent system. Five
batches of uranium produced from the short-cooled metal were
isolated to permit U237 decay prior to shipment to the UO3 cal-
Approximately 1600 units of plutonium were reworked within the
building as a result of leakage from a plutonium sampler tank
circulating pump (L-9) to the hood floor. Eight tons of out-of-
specification uranium collected in June were reprocessed through
the final uranium cycle by increasing the feed rate to this cycle
for two days.
During the shutdown the acid waste concentrators were emptied for
work on the condensate trap pits; R cell equipment was given a
nitric flush; the final uranium cycle 2D column was thoroughly
flushed; and the #1 organic system was washed with a permanganate-
carbonate solution. A flush of the final plutonium 2B column was
also made, removing approximately 1.4 Kg's of plutonium.
B. Radiation Experience
1. Radiation Occurrences
Five radiation occurrences were experienced during the month.
The first case was a general low level fission product fallout
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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/m1/17/: accessed May 26, 2019), University of North Texas Libraries, Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.