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TITLE: |
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DOCUMENT ID: |
6670 Thermal
Stress |
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1.0
Purpose
Jefferson Lab defines thermal stress as the physical and physiological reactions of a worker to temperatures that fall outside the normal comfort zone. The potential for thermal stress at Jefferson Lab exists mainly during the summer and winter months.
Mitigation actions are used to reduce thermal
stress hazard conditions. The actions defined within this section meet or exceed
the contractual requirements of 10 CFR 851.
2.0
Scope
Jefferson Lab
recognizes that the most effective mitigation technique for thermal stress
conditions is to wear appropriate clothing, and personal protective equipment.
Work planning at Jefferson Lab, particularly during the summer months,
considers ambient temperature and implements mitigation techniques as
required.
Jefferson Lab uses the National Weather
Service Heat Stress Index for areas exposed to ambient conditions. For
temperature monitoring, application guidelines, and calculations, the 2016 Threshold
Limit Values for Physical Agents in the Work Environment section on Thermal
Stress – Heat Stress & Heat Strain is used (measured as the Wet Bulb
Globe Temperature (WBGT)).
This chapter does not address specific
hazards or injuries resulting from sudden exposure to cryogenic materials. See ES&H Manual Chapter 6550
Cryogenic Safety Program.
3.0
Responsibilities
NOTE: Management
authority may be delegated to a task qualified Jefferson Lab employee at the
discretion of the responsible manager.
3.1
Everyone at Jefferson Lab
·
Maintain
fluid (especially water) intake.
·
Immediately
report heat stress symptoms to supervisor and Occupational Medicine.
·
Follow
work demand restrictions or work/rest regimens when indicated by ESH&Q
Division.
·
Obtain
heat stress training as required in SRL.
·
Be
aware of adverse temperature conditions. Take appropriate precautions as
outlined in ES&H
Manual Chapter 6670 Appendix T1 Heat Stress Mitigation and ES&H Manual Chapter
6670 Appendix T2 Cold Stress Work Cessation Procedure.
·
Monitor
anticipated heat conditions and conduct heat stress monitoring
·
Advise
staff when work demand
and work/rest regimen
is to be implemented.
·
Maintain
heat and cold monitoring records in accordance with department procedures.
3.3
Facilities
Management and Logistics
·
Maintain
the on-site Jefferson Lab weather station and provide a link to the data on a
Jefferson Lab web page (currently https://www.jlab.org/fm/wx/).
3.4
Supervisor/Subcontracting Officer’s
Technical Representative (SOTRs)/Sponsor
·
Request assistance from
Industrial Hygiene to evaluate work assignments involving heat stress conditions.
·
Minimize worker’s exposure
to heat sources when feasible.
o Allow for acclimatization in work plan when elimination of heat
stress conditions is not feasible.
· Provide appropriate rest periods for workers. Consult Industrial Hygiene for appropriate work/rest schedules.
3.4.1
SOTRs also
o
Ensure
subcontractor personnel abide by their Jefferson Lab accepted procedure or this
procedure’s requirements.
o
Inform
subcontracted workers of thermal stress warnings and notifications.
o
Ensure
subcontracted workers are properly advised of work modification and rest
periods.
o
Ensure
fluid replacement sources and shelter techniques are available.
o
Notify
ESH&Q of thermal stress areas that may require monitoring.
o
Review and accept subcontractor’s thermal
stress program which must meet or exceed the requirements of this Jefferson Lab
program
OR
o The subcontractor follows this
program and the procedures outlined in its associated appendices:
§
ES&H Manual Chapter
6670 Appendix T1 Heat Stress Mitigation
§
ES&H Manual Chapter
6670 Appendix T2 Cold Stress Work Cessation Procedure
4.0
Expectations
4.1
Heat Conditions
Areas of known routine hot working
environments for all or part of the year are monitored on a periodic basis. ES&H Manual Chapter
6670 Appendix T1 Heat Stress Mitigation addresses the procedure used to
monitor and mitigate potential injury or illness due to heat stress.
4.2
Cold Conditions
As of
the approval date of this chapter, there are no known work environments with
temperatures that would be considered cold stress areas. One area with routine
cold conditions is the food refrigeration area of CEBAF Center. However, this
area is not occupied for continuous work but only visited as needed. ES&H Manual Chapter
6670 Appendix T2 Cold Stress Work Cessation Procedure addresses the
procedure used to mitigate potential injury or illness due to cold stress.
5.0
References
·
EHS&Q Manual 2410
Appendix T1 Hazard Issues List
·
Facilities Management &
Logistics Live Weather available from the Jefferson
Lab Insight Webpage
·
2016
ACGIH Threshold Limit Values for Physical Agents in the Work Environment, section
on Thermal Stress
6.0
Revision
Summary
Revision 2.0 –
05/29/19 – ‘Heat and Cold Stress Mitigation Program’ retitled ‘Thermal
Stress’ to reflect current lab operations; clarified responsibilities
Revision 1.4 – 06/19/18 – Updated TPOC to J.Williams
Revision 1.3 – 06/04/15 – Periodic Review; updated Industrial Hygiene responsibilities
Revision 1.2 – 09/27/12 – Periodic review; no changes required
Revision 1.1 – 05/10/11 – Updated to provide for “hot work” activities
Revision 1.0 – 05/09/09 – Updated to
reflect current laboratory operations
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ISSUING
AUTHORITY |
TECHNICAL POINT-OF-CONTACT |
APPROVAL
DATE |
REVIEW DATE |
REV. |
Page 4 of 4 |
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ESH&Q Division |
05/29/19 |
05/29/22 |
2.0 |
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