106-AN grout pilot-scale test HGTP-93-0501-02 Page: 45 of 151
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4.0 GROUT PRODUCTION
The grout in this pilot-scale test was produced in four different runs.
The first run produced enough grout to fill the gradient mold and the first
lift in the lift mold. This run is referred to as the main production run.
The second, third, and fourth runs were short production runs that produced
enough grout to complete the second, third, and fourth lifts in the lift mold.
These smaller runs are referred to as the lift pours. The observations made
and data collected during these runs are discussed in the following sections.
4.1 MAIN PRODUCTION RUN
The main grout run was conducted on April 16, 1992, and started at 9:48
a.m. The plan was to start production, complete the grout pour into the
gradient mold, and then pour the first lift into the lift mold. While filling
the gradient mold, four 55-gal drums were filled for WHC core drilling tests.
Production went as planned except for one shutdown, which occurred after 218
minutes of elapsed run time. This shutdown was caused by a blockage in the
waste feed line. When the reduced waste feed flow was first noticed, attempts
were made to add process water to the waste feed to avoid a shutdown.
However, enough thick grout was produced to clog the mixer. Grout started to
backup into the dry-blend inlet, and a shutdown could not be avoided. The
shutdown lasted 58 minutes while the mixer was cleaned and the waste line was
back-flushed. The rinse water generated from cleaning the mixer and the water
from the timed flush of the grout pump inlet were pumped to the dumpster prior
to restarting grout production. This shutdown'is the reason for the
deviations that appear in the run information between 218 and 276 minutes of
elapsed run time.
The nominal composition of the grout produced was 8.7 lb of dry-blend per
gal of waste. The planned production rate of 10 gpm of grout required a waste
flow of 6.94 gpm and a dry-blend feed rate of 3623 lb/hr. An initial water
back-flush of the waste line was required before waste flow could be
established. After the flush the startup went smoothly, and the nominal
composition was being produced within 1 minute. Sampling during the grout run
went as planned. Slurry samples from the surge tank and at the grout
discharge were taken every 30 minutes. Collection of the slurry samples was4.1
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Bagaasen, L. M. 106-AN grout pilot-scale test HGTP-93-0501-02, report, May 1, 1993; Richland, Washington. (https://digital.library.unt.edu/ark:/67531/metadc1319387/m1/45/: accessed July 16, 2024), University of North Texas Libraries, UNT Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.