HASP Glossary cont'd - est55030157

DOE-EM-STD-5503-94

Threshold Limit Value-Time-Weighted Average (TLV-TWA): The time-weighted average

concentration for a normal 8-hour workday and a 40-hour workweek to which nearly all workers

may be repeatedly exposed, day after day, without adverse effects.

Toxic Atmosphere: An atmosphere containing a concentration of a substance above the

published or otherwise known safe levels, such as the Threshold Limit Value, Permissible

Exposure Limit, Recommended Exposure Limit, or the Immediately Dangerous to Life or Health

level.

Work: The process of performing a defined task or activity; for example, research and

development, operations, maintenance and repair, administration, software development and use,

inspection, safeguards and security, data collection, and analysis.

Work Plan: That part of a comprehensive Site Health and Safety Program which addresses the

tasks and objectives of site operations, including logistics and resources.

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