|Chapter 6550 Cryogenic Safety Program|
Jefferson Lab utilizes super-cooled gases (otherwise known as cryogens) to support superconducting radio frequency cavities and magnets at extremely low (cryogenic) temperatures (below -150°C, -238°F, or 123 K).Scope
This document describes responsibilities and expectations associated with the following cryogens used at Jefferson Lab:
Table 1: Required Safety Training by Job Classification
T1 Required Personal Protective Equipment for Cryogen Work
Cryogen handling requires specific Personal Protective Equipment (PPE). ES&H Manual Chapter 6550 Appendix T1 Required Personal Protective Equipment for Cryogen Work describes how to determine the appropriate PPE for cryogen work and how to obtain it.
T2 Response to Personal Cryogen Exposure
ES&H Manual Chapter 6550 Appendix T2 Response to Personal Cryogen Exposure describes how to recognize and appropriately respond in the event of personal exposure to cryogens.
T3 Emergency Response to Uncontrolled Cryogen Release
ES&H Manual Chapter 6550 Appendix T3 Emergency Response to Uncontrolled Cryogen Release describes how to recognize an uncontrolled cryogen release and the appropriate response procedure steps to follow.
ES&H Manual Chapter 6150 T2 Moving Gas Cylinders from Storage to Work Areab
Only qualified and authorized Cryogenic Workers are allowed to move cryogenic dewars. provides Jefferson Lab's minimum requirements for performing this operation.
ES&H Manual Chapter 6540 T2 ODH Classifications, Engineering and Administrative Control Practices, Training, and Medical Exclusions
Only trained and authorized individuals are allowed access to buildings using cryogenic piping and equipment. These buildings have posted ODH signs that specify requirements for entry. (See ES&H Manual Chapter 6540 Appendix T2 ODH Classifications, Engineering and Administrative Control Practices, Training, and Medical Exclusions for additional information.)
Jefferson Lab requires all cryogens used or stored on site to be labeled. Cryogen workers fill out and affix both the content label and National Fire Protection Association (NFPA) label indicating the hazard characteristics associated with the cryogen. These labels are available from the Industrial Hygiene. The exception would be if this information is included on the manufacturer's label.
The operation of large cryogenic systems requires certain maintenance and repair to be done in the presence of cryogens. Only trained individuals may perform these operations under the authorization of the Senior Cryogenics Coordinator - Accelerator Operations, or for Experimental Halls.
Management authority may be delegated at the discretion of the responsible manager.
Everyone at Jefferson Lab
Qualified Cryogenic Worker
Supervisors/Subcontracting Officer's Technical Representative (SOTR)/Sponsor
Senior Cryogenics Coordinator (SSC) for Accelerator Operations and SSC for End Stations
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