The 11th Symposium on Accelerator Science and Technology, Harima Science Garden City, 1997

Radiation Safety Control System for SPring-S
Tetsuya TAKAGI*, Shigeki FUJIWARA*, Keiichi WAKASHIMA,Shigefumi EGUCHI , Hiroki MUKAI* and Ichiro SAKAMOTO
The Institute of Physical and Chemical Research, SPring-8 Project Team
Kamigori-cho, Hyogo-ken, 67:8-12 Japan*Japan Synchrotron Radiation Institute
Kamigori-cho, Hyogo-ken, 678-12 Japan
Introduction

safety,, the RSCS has the highest priority in accelerator
operation.
·Before starting operation , an operator should ask theA Radiation Safety Control System for SPring-8(RSCS) consists of a Radiation Monitoring System(RMS) ,an Access Control System (ACS) and a

SICS for permission . If any erratic condition occur in
the ACS and RMS during operation, the SICS sends aSafety Interlock Control System (SICS) . A large

beam stop command.

number of devices for the RSCS are distributed in
the injection accelerator (Linac and Synchrotron)building and Storage Ring building.

The SICS permits the accelerators operation, when{a) The safety keys are returned in the key-box of theaccelerator rooms.

Radiation monitoring system Ill(b) The shield doors are closed in the accelerator rooms.
(c) The emergency buttons are not pushed in theThree monitoring posts outside the injection
accelerator building have been installed to measure
the leakage-radiation during operation of Linac andSynchrotron, beside a lot of ionization chambers andneutron counters are used to measure the radiationlevel at the accelerator rooms (Linac accelerator room,Synchrotron room, Storage Ring enclosure), and theexperimental hall.
In order to measure the radioactivity in the air of theaccelerator rooms and at the exit of the exhaust duct,

accelerator rooms.
The SPring-8 workers are not permitted to enter theaccelerator rooms when the accelerators are in operation.
Figure 1 shows a block diagram of the RSCS.

.

the activity monitonng stations have been built in theSPring-8.

Data logging andl Display
All the data coming from the devices are logged
periodically by the data server of the RSCS and stored indisk files ; the RSCS can draw graphs and tables byusing those data.

The ACS consists of identity card security system,

The radiation level and the activity in the air from
RMS are displayed on CRT, which are placed on themain control room , at the entrance of the experimental
hall and the safety center.
The status of safety key:;, emergency buttons,
accelerator operation, shield doors and the number of
persons working in the controlled area are also
displayed on CRT.

personal keys (safety keys), operation status lamps andFigure 2 shows an example of display on CRT.

Access control system
andSafety interlock control systemshield doors.
The entrance to and exit from the controlled area areReference

checked very strictly by personal card. At the entranceof each the accelerator rooms, the operation conditions[1] Yukihiro Miyamoto, Hisao Ueda, and Yasunoriof the accelerators (Linac, Synchrotron, Storage Ring)
are displayed on the operation status lamps.
The accelerators are controlled with a computer
system which is linked with the RSCS. For radiation-508-

Harada, "Journal of Health Physics", Vol.32,No.2 (June 1997)

The 11th Symposium on Accelerator Science and Technology, Harima Science Garden City, 1997

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Weather data:iI Main beam shutter fG--J'1Radiation
monitorFig-1 Block diagram of the RSCS.

Fig-2

Example -of display on CRT.

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Beam Line i

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Interlock