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Radiological Assessor Training
DOE-HDBK-1141-2001
Student's Guide
employees' respirators or respirator cartridges.
The actual incident began between the hours of
0130 and 0415 on August 23, 1991, at the PGDP
C-337-A Feed Vaporization Facility.
The operators routinely assigned to C-337-A for the
period of 1900 hours on August 22, 1991, through
0700 hours on August 23, 1991, were not available
due to the illness of one and an alternate work
assignment of the other at another facility (C-360).
Two operators who are not routinely assigned to the
area were then assigned to cover C-337-A. One
operator (No. 2) was qualified for operation of the
facility while the other (No. 1) was in training for
qualification. (This is in compliance with facility
Operational Safety Requirements.) Supervisor
interaction was minimal, with only one brief visit
around the middle of the shift.
The operations in process at the time of the incident
were the routine disconnection and removal of
emptied UF6 feed cylinders and subsequent
replacement with full cylinders. This operation
consists of disconnecting a short length of
connecting pipe between the cylinder and the
system piping that leads to the diffusion process
equipment. This pipe is called a pigtail; it has
threaded connections and gaskets on each end.
Since pigtails are routinely reused, each cylinder
change requires replacement of gaskets on pigtails
to minimize the possibility of UF6 releases during
heating and feeding of the UF6 into the diffusion
process. At times these gaskets can be difficult to
remove from the pigtail. A special tool is available to
assist in the removal of these gaskets; however,
difficulty can still be encountered. The pigtails used
that night had been used for several feeding cycles,
as is normally the case. The exact number of cycles
could not be determined.
Module 16 - 4


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