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6420
Appendix T1 Radio Frequency
Survey |
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Jefferson Lab has determined that working with non-ionizing radiant energy carries an unmitigated Risk Code >2. At a minimum all tasks requiring with non-ionizing radiant energy are discussed with the supervisor prior to commencement of work. An Operational Safety Procedure (OSP) is written for work considered to be Risk Code >2 in accordance with ES&H Manual Chapter 3210 Work Planning, Control, and Authorization Process. |
Jefferson Lab considers radio frequency
(RF) energy to be a hazard issue.
The degree of danger from RF energy is directly related to:
the source power level; distance and shielding; and the frequency, or
wavelength, of the radio waves. This appendix provides the process steps for
determining when an RF survey is required; how to schedule it; performance and
documentation requirements; and when follow-up actions are required.
Sources
of RF energy at Jefferson Lab include:
·
Accelerator components
·
Microwave Ovens*
*This appendix does not apply to microwave ovens located in a “common” or “break” area when used in accordance with manufacturer’s instructions. Enter a Facilities Management Work Request if break area equipment is damaged or not working properly. Use of microwave ovens for other than manufacturer’s instructions is considered a Risk Code >2 and requires a Work Control Document. |
RF
is denoted with the following signage:
Jefferson Lab recognizes that
listing the requirements for every RF source would be prohibitive; it is
therefore required that an RF survey be performed on all sources and safety
mitigations be established and observed by all workers.
The
process steps for this procedure are performed in coordination with ES&H
Manual Chapter 6420 Non-Ionizing Radiant Energy (i.e.: Radio Frequency (RF),
Microwave, and Electro Magnetic).
NOTE: Management authority may be delegated to a task qualified Jefferson Lab employee at the discretion of the responsible manager.
· Complete and maintain appropriate RF Survey Training.
· Provide appropriate RF Survey Training.
Unless otherwise stated anyone may perform the following process steps:
Step 1:
Determine if a RF Survey is
Required
An RF
Survey may be performed at any time, is recommended for any of the following
conditions, and is required per department procedures:
·
Prior
to commissioning new RF equipment.
·
After
installation leak test of high-power RF equipment, including waveguides.
·
After
changes to operating power for equipment set-ups.
NOTE: Check
the RF emission frequency with the manufacturer; you
may need to monitor for induced currents. |
Contact a Qualified RF Surveyor or contact Industrial Hygiene for survey.
NOTE: It is recommended that safety interlocks be incorporated into RF equipment design and installation. Whenever feasible, high-power waveguides must be pressurized, with loss of pressure automatically deactivating the RF source. |
Surveys are performed and recorded in accordance with documented department procedures that have been reviewed by Industrial Hygiene. See Industrial Hygiene Supplement – RF Survey – Non-Ionizing Radiation for an example.
Minimum survey requirements include:
·
Date and Time – Provide both current and most recent
·
Source Description
a. RF emission frequency
b. duty cycle
c. power
·
Source Description/Schematic
·
Safety Controls (i.e. interlocks,
signs, Work Control
Documents)
·
Meter/Probe Information:
a. Model Number and Serial number
b. Last Calibration Date
·
Measurement
·
Technician signature
Contact Industrial Hygiene when fields exceed the occupational exposure limit in Figure 1 below.
Figure 1: 2016 ACGIH Radiofrequency and Microwave TLVs ®
5.0
References
ACGIH – 2016 TLVs and BEIs – Based on the Documentation of the Threshold Limit Values for Chemical Substances and Physical Agents and Biological Exposure Indices.
6.0
Revision Summary
Revision 1.2 – 04/24/18 – Updated Figure 1 and References with current
TLV reference per CATS#STR-2017-12-01-03
Revision 1.1 – 04/18/16 – Periodic Review; minor edits with no substantive changes
Revision 1.0 – 07/16/12 – Updated to reflect current laboratory operations
ISSUING
AUTHORITY |
TECHNICAL
POINT-OF-CONTACT |
APPROVAL
DATE |
REVIEW
DATE |
REV. |
ES&H Division |
04/24/18 |
04/24/23 |
1.2 |