Quarterly review of 241-SY-101 mixer pump data: October - December, 1998 Page: 3 of 44
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HNF-4039, Rev. 0
1.0 QUARTERLY SUMMARY
This report presents data obtained on 241-SY-101 pump performance. The period
covered is October 1 through December 31, 1998.
During the quarter:
* There was an indication of a 7.0-inch increase in the waste level at riser lA, and
an average growth rate of 0.076 inches per day.
* There was an indication of a 2.3-inch increase in the waste level at riser 1C.
This riser was flushed with water several times, which would lower the level of
the crust at this location.
" Gases continued to be released at less than the pre-pump installation baseline
rate, indicating a decrease in the gas generation rate, or an increase in gas
retention, or both. The release rate was about 60 percent of the rate in the
previous few quarters, and only 44 percent of the pre-pump release rate.
* There was no change in the parameters that monitor pump performance.
Key controls exist for waste temperature, gas concentration, pump parameters, and
long-term waste behavior associated with the safe operation of the mixer pump that mitigates
the buoyant displacement gas release event behavior of 241-SY-101. Table 1-1 compares the
key controls and the current state of the waste as of December 31, 1998.
The pump was run 35 times between October 1 and December 31, 1998. Most of the
pump runs were normal 25-minute, 1000-rpm excavation runs performed to mix the waste and
release gas. Beginning in November, the pump oil high temperature alarm, set at 190 *F,
would sometimes go off towards the end of pump runs. In those cases, the pump runs were
shortened by approximately 1-2 minutes. The pump schedule was nominally three runs per
week. However, core sampling activities interrupted the usual pump schedule several times
during the quarter, resulting in less pump runs than normal. During this quarter, the pump
showed no indication of degradation.
The Enraf level gauge in riser IA indicated a level increase of 7.0 inches. The
estimated growth rate is 0.076 inches per day, which is much higher than the growth rate of
0.043 inches per day during the previous quarter. It appears that the level growth is due to gas
being retained in or under the crust. A temperature validation probe at MIT 17C indicated that
the crust is thickening and the level of settled solids may have increased slightly. The level
growth phenomenon is discussed further in Section 7.0.
The gas chromatograph (GC) GC-3, was operational 94% of the time. GC-1 was
operational 95% of the time. During the quarter, the calculated gas releases were 44% of the
baseline generation rate prior to pump installation (and significantly less than last quarter).
The final run of the quarter, on December 29, 1998, was the 1002nd time the pump was
operated since its installation in the tank. Hydrogen and nitrous oxide concentrations were
lower than in previous quarters.
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CONNER, J.M. Quarterly review of 241-SY-101 mixer pump data: October - December, 1998, report, May 11, 1999; United States. (https://digital.library.unt.edu/ark:/67531/metadc725395/m1/3/: accessed March 29, 2024), University of North Texas Libraries, UNT Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.