Chemical Processing Department Monthly Report: July 1957 Page: 30 of 107
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the key block. Personnel dose rates were 500 to 3000 mrads/hr
for this work. The canyon was traversed from the west entrance
to the east entrance for the first time in well over three
years. The traverse was primarily of an inspection nature and
the maximum exposure received was 70 mrads. Although there is
considerable work to be done, it is felt that a major
accomplishment has been performed in contamination control in
the Redox Canyon. Repair work on the 60-Ton Crane following
the 440 volt electrical supply breakdown was performed in
personnel dose rates of 100 mrads/hr. Here again the per-
sonnel dose rates were relatively low and were a direct result
of the extensive May decontamination program conducted on the
3. Other Contamination Experience
Equipment decontamination in the U Plant canyon proceeded
satisfactorily with the first pump being decontaminated from
8.5 rads/hr to 150 mr/hr at 2 inches. Actual repair of the
pump was performed in reasonable personnel dose rates.
Skin contamination was slightly more prevalent this month as
compared to previous months with seven of the nine cases
related to crane work. As best can be determined considerable
quantities of loose dust type contamination has built up in
this general work area and unfortunately the Minor Construc-
tion activities on the crane maintenance platform have
prevented any corrective measures on this contamination pro-
blem. It is hoped to bring this dust contamination problem
under control as quickly as possible.
F. Improvement Experience
1. Process Tests and Revisions
Information relating to this item is covered in the Research
and Engineering portion of the Department Report.
2. Miscellaneous Improvement Items
The air compressor at the 241-SX tank farms was changed from
a belt drive to a direct drive during the early part of the
month. This change has improved the air supply to such an
extent that no shortage of compressed air has been experienced
since the modification. Previously, frequent shortages occurr-
Two mechanical seals for the L-6 sample recirculating pump
in the 233-S Building arrived from the vendor on July 18.
One seal was installed on a spare pump in the shop where it
underwent satisfactory operability tests. Due to the
difficult working conditions encountered in the 233-S Bldg.
Greenhouse, it is now planned to replace the entire pump
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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/m1/30/: accessed May 20, 2019), University of North Texas Libraries, Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.