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After these preliminary services are performed, a
person specifically licensed by the NRC or an
agreement state must do the start-up of the gage.
This involves unlocking the source holder and
turning it ON; testing for proper operation of the
source holder and position indicator; making the
initial radiation field intensity survey; and initial
testing for leakage of radioactive material. This
specifically licensed person must determine that
the gage is installed in such a manner that
personnel working in the vicinity of the gage will not
receive a radiation dose greater than 0.5 rem/yr.
The gage is shipped from the Ronan factory with
the source holder locked OFF. The combination ill
be given only to the specifically licensed person
performing the start-up and placing the gage in
service.
a copy of the tag attached to the lock follows:
Figure 4:
Warning Tag
Device shall be tested for radioactive leakage and
proper functioning of source actuator rod at
installation, at source replacement and thereafter at
no longer than three-year intervals.
11.8 Well Source Holders SA-4, SA-10, SA-15
11.8.1 Source actuator:
The actuator should
always move freely. There will be some slight
resistance to movement due to bearing friction of
the gasketed filling, which keeps out moisture and
dirt.
Do not force the source rod actuator.
If a portable radiation survey meter is available, the
radiation field intensity can be measured at the
back of the detector housing. With the source rod
in the STORE position, the field intensity should be
measurable. When the source is placed in the well,
the field intensity should decrease.
11.8.2 Source insertion procedure:
a) Open shutter and pin open with lock pin.
b) Loosen CGB fitting at source rod.
c) Remove handle and attach source extender rod.
e) Push source rod until source bottoms out in
well.
f) Tighten CGB fitting over source extender rod.
11.8.3 Source retraction procedure
a) Loosen CGB filling.
b) Pull source handle back until source rod locates
inside source tube. Source will hit positive stop
inside holder.
c) Push shutter to OFF. Lock with lock pin or
padlock.
d) Remove extender rod.
e) Remove handle from extender rod and attach to
source rod.
11.8.4 Wiping the test points:
A wipe test and
radiation survey must be made before the source is
installed onto the vessel wall and before the source
is inserted into the well. The radiation protection
officer (RPO) or licensed personnel must supervise
the installation, source insertion and retraction. The
RPO must also classify the area based on the
radiation survey and personnel occupancy in the
vicinity of the gage.
The RPO must write control procedures for
personnel not to work or occupy the area around
the gage when the process is down, maintenance
on the vessel is performed, or when the vessel is
empty.
Anyone following the instructions of a leak test kit
may perform the wiping procedure, but only a
person or company specifically licensed by the
NRC or an agreement state may do the analysis for
radioactive material.
Using a cotton swab, wipe around the source rod
extending out the top of the source holder and at all
seams as shown in Figure 5. These areas are most
likely to be contaminated if the source leaks. Do not
touch the cotton-tipped end or allow it to touch
other objects, as this would spread contamination if
a leak is present.
After making the wipe test, replace the cotton swab
in the vial with the cotton-tipped end at the bottom.
Replace the cap on the vial, place the vial in the
shipping tube and replace the top on the shipping
tube. Send to: Ronan Engineering Company, 8050
Production Drive, Florence, KY 41042.
