ES&H Manual



6420 Appendix T2

Operational Safety Procedure Development for Qualifying Static Magnetic Fields



1.0            Purpose


When a Task Hazard Analysis indicates that a specialty magnets poses an unmitigated Risk Code>2 a work control document (WCD) is required to ensure hazard issues are addressed and appropriately mitigated. This appendix provides the requirements for this WCD.


2.0            Scope


This procedure provides the minimum safety requirements for specialized magnets with the potential power of: 

·         2T (20,000 Gauss) or more, or

·         0.5 mT (5 Gauss) – under certain conditions


It does not preclude the need to incorporate additional mitigation to ensure the safety of people, equipment, and the environment from associated activities.


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/Static Magnetic); and ES&H Manual Chapter 3310 Operational Safety Procedure 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              Magnet Owner

·         Complete a Work Control Document for magnets under your authority that have been determined to be a Risk Code >2. 


4.0            Process Steps


Unless otherwise stated the Magnet Owner performs the following process steps.


Step 1:             Task Hazard Analysis

·         Use ES&H Manual Chapter 3210 Appendix T1 Task Hazard Analysis (THA) Worksheet to outline the task steps or services required for the area/equipment. 

·         Identify known and potentially hazards conditions, suspected causes, and environmental concerns. 

·         Identify required Safety Procedures/Practices/Controls/Training.


Step 2:             Operational Safety Procedure (OSP)


·         Use ES&H Manual Chapter 3310 Operational Safety Procedure Program to develop an OSP to document the hazard issues and mitigation requirements associated with magnets.

·         The following additional information is required to be addressed prior to review and approval of the document.



·      Medical requirements

·      Incidental worker requirements

Magnetic Device Inventory

·      Specifications

·      Define all components

Magnet Environment

·      Exclusion zone for electronic equipment

·      Magnetic field survey and map

·      Ferromagnetic tool or equipment (e.g. crane, JLG) hazard area

·      Optical systems

Superconducting Magnets:

·      Cryogenic equipment


·      Normal use

·      Ferromagnetic object/tool sweep

·      Maintenance procedures

·      Off-normal and emergency procedures (i.e. quench)

·      LO/TO procedures


·      Protective circuitry (quench)

·      Grounding/Ground-fault circuit-interrupter (GFCI)

·      Lead covers

·      Barricades

·      Warning signs

·      Beacons

Vacuum Systems

·      Window protection

Superconducting Magnets:

·      Pressure relief

·      Ventilation

·      ODH assessment

·      Quench protection


Step 3:             Complete the OSP Document

·         Complete the process steps as outlined within ES&H Manual Chapter 3310 Appendix T1 Operational Safety Procedure (OSP) and Temporary OSP Procedure for validation, approval, recordkeeping and implementation.


5.0            Revision Summary


Revision 1.1 – 01/22/18 – Updated to align with the updated Worker Safety & Health Plan

Periodic Review – 04/18/16 – No changes per TPOC

Revision 1.0 – 07/16/12 – Updated to reflect current laboratory operations











ES&H Division

Jennifer Williams





This document is controlled as an on-line file.  It may be printed but the print copy is not a controlled document.  It is the user’s responsibility to ensure that the document is the same revision as the current on line file.  This copy was printed on 1/24/2018.