ORNL-4191 - the Molten Salt Energy Technologies Web Site

27
Fig. 1.13. Motor of Reactor Cell Cooler No. 1 Showing Dust Accumulation.
were replaced after run 11. This reduced the
coastdown after the doors were partially lowered
to 3 in. It was also necessary to replace part
of the outlet door soft seal gasket material which
had burned and blown loose. Operation of the
doors has been without incident, and the radiator
seals have been adequate for operation.
Off-gas Systems
J. R. Engel
Operational difficulties with the off-gas sys-
tems were greatly reduced during this period of
operation. One 7-hr power reduction was required
to replace a filter in the coolant off-gas line.
Otherwise, only minor inconvenience, which had
er operation, was experienced.
PHOTO 87750
Particle Trap. - The new off-gas filter' (pa
trap) installed in the fuel off-gas line before the
start of run 11 continued to function satisfactorily
with no evidence of increasing pressure drop.
The pressure drop across this unit, with one sec-
tion valved out, remained below 0.1 psi through-
out the operation, The temperatures near the
various filter media depend to some extent on
operating conditions other than power. Increased
pump tank pressure or reduced purge-gas flow
increases the transport time for fission products
from the pump tank to the particle trap. This per-
mits more radioactive decay en route and results
in lower temperatures at the particle trap. Never-
theless, under similar con ons the steady-state
temperature near the coarse filtering material
5
Ibid., p. 42.
I