Apparatus for the reduction of tritium emissions into the atmosphere Page: 6 of 7
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Fig. 5. Stepping switch programmer.
or continuous stepping of the drum. The programmer
is programmed for sequential operations by the ap-
propriate placement of pegs and accompanying signal
circuitry through the lever switches. The sequence
of operations for a time switch initiated cycle is
as follows. (Refer to Figs. 6 and 7.) When the
time switch closes the programmer advances one step.
The solenoid valves V1, V2, and V3 open (see Fig.
1), the pump starts, and the pressure switch cir-
cuit is partially completed. The processing of the
gas then proceeds. When the holding tank pressure
drops to a prescr-bed value, the pressure switch
closes causing the programmer to single step.
Cant Timer
step VI V2 V3 Pump a. lights
H I 2 3 4 5 6 7 82
22
23x
X Indicates peg In that positionPty Vi E2 V j dy ight
Pr6grmm_ "'rmina's
12345678910.
Ru 7 ls c
VV. V2, Vt Pwmp Ips,
0-611
Fig. 7. ECS electrical system schematic.
Valves V1, V2, and V3 close and the pimp stops. A
circuit through lever switch #1 is completed to the
continuous stepping input. The drum rotates until
at position 24 the continuous stepping circuit is
broken, placing the programmer in the ready position
for a new cycle. Signal lights connected through
lever switch #8 indicate whether the system is in
the "READY" or "RUN" mode.
Because the system is automatically controlled,
it can be operated during off hours. However, since
operation of the system may be unsupervised and be-
cause of the hazardous nature of tritium, an abort
feature has been included in case of pump or power
failure. Should pump performance drop resulting in
insufficient vacuum to operate the pressure switch,
a time switch cuts power to the system after a cer-
tain period. This causes the pump to stop and all
valves to close. The "RUN" light remains on, indi-
cating a malfunction to personnel upon return. The
same thing happens it the event of a temporary pow-
er failure. A manual ON-OFF switch is also includ-
ed in the circuitry. All power is drawn from a
standard 120 VAC-60 Hz supply.
IV. TEST PROGRAM
The output of the ECS was fed directly into a
Kanne chamber at known flow conditions to yield a
quantitative measure of the extremely low tritium
concentration. The Kanne chamber is a very sensi-
tive ionization chamber used to monitor gaseous ra-
dioactive 8-emitting contaminants. A mass spectro-
graphic analysis of the test gas, before processing,
showed its composition to be:Fig. 6. Drum program chart.
3
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Dube, C.M.; Coffin, D.O. & Stoll, R.D. Apparatus for the reduction of tritium emissions into the atmosphere, report, June 1, 1973; New Mexico. (https://digital.library.unt.edu/ark:/67531/metadc1033776/m1/6/: accessed July 16, 2024), University of North Texas Libraries, UNT Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.