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5 Maintenance and fault rectification
SHLD1 • Source holder
62092-EN-190704
Warning:
Source holders with corroded or stiff locking device or operating lever
must be replaced immediately.
5.3 Test of the switching mechanism
Test the function of the switching mechanism on the source holder
at regular intervals. We recommend carrying out this test every six
months.
Measurement of the local dose rate
1. Remove the padlock as described in chapter "
Setup
".
2. Move the operating lever as described in chapter "
Setup
" several
times from the "ON" to the "OFF" position and vice versa. The op-
erating lever should be easily movable and must have no traces
of corrosion in the visible area.
If the operating lever cannot be moved from "ON" to "OFF" posi-
tion, follow the instructions in paragraph "
What to do in case of
emergency
".
If it is hard to move the operating lever or if there are other signs
of a malfunction, the source insert must be locked in position
"OFF" and the responsible radiation safety officer informed.
In case of corrosion: Follow the instructions in chapter "
Mainte-
nance/Measures in case of corrosion
".
1. Remove the padlock (see chapter "
Setup
")
2. Pull out the safety bolt.
3. Switch the operating lever by means of compressed air from the
position "OFF" to position "ON". The operating lever should move
without interruption to position "ON".
Caution:
Do not grasp any mechanical parts of the pneumatic drive while the
pneumatic actuator is switching over.
4. Reduce the pressure to below 4 bar (58 psi). The operating lever
must move back to position "OFF".
If the operating lever does not move smoothly or shows signs of a
possible malfunction, the operating lever must be locked in posi-
tion "OFF" and the responsible radiation safety officer informed.
If the operating lever cannot be moved from "ON" to "OFF" posi-
tion, follow the instructions in paragraph "
What to do in case of
emergency
".
In case of corrosion: Follow the instructions in chapter "
Mainte-
nance/Measures in case of corrosion
".
5.4 Tightness test
The tightness of the source capsule must be checked at regular inter-
vals. The frequency of the tightness test (wipe test) must correspond
to the specifications of the authorities or the handling permit.
Source holder with manu-
al switching mechanism
Source holder with pneu-
matic switching mecha-
nism
