Explosive Hazard, Class III

DOE-HDBK-1188-2006

the accident potential is greater than for Class III, but the exposure of personnel performing

contact operations is acceptable. Class II includes activities where the energies that do or may

interface with the explosives are normally well within the safety boundaries for the explosives

involved, but where the loss of control or these energies might approach the safety limits of the

explosives. Examples of Class II activities are weighing, some wet machining, assembly and

disassembly, some environmental testing, and some packaging operations. [DOE M 440.1-1]

218.

EXPLOSIVES HAZARD, CLASS III. Class III consists of those explosives activities that

represent a low accident potential. Class III includes explosives activities during storage and

operations incidental to storage or removal from storage. [DOE M 440.1-1]

219.

EXPLOSIVES HAZARD, CLASS IV. Class IV consists of those explosives activities with

insensitive high explosives (IHE) or IHE subassemblies. Although mass detonating, this

explosive type is so insensitive that a negligible probability exists for accidental initiation or

transition from burning to detonation. IHE explosions will be limited to pressure ruptures of

containers heated in a fire. Most processing and storage activities with IHE and IHE

subassemblies are Class IV. However, the following examples of explosives activities with IHE

and IHE subassemblies will remain Class I:

pressing;

some machining (see DOE M 440.1-1, Chapter II, paragraph 12.4.2.c);

dry milling; and

dry screening.

[DOE M 440.1-1]

220.

EXPOSED (live parts): Capable of being inadvertently touched or approached nearer than a

safe distance by a person. It is applied to parts that are not suitably guarded, isolated, or

insulated. [IEEE 1584-2002] [NFPA 70E] [DOE-HDBK-1092-2004]

221.

EXPOSURE ASSESSMENT (EA). The estimation or determination (qualitative or

quantitative) of the magnitude, frequency, duration, and route of employee exposure to a

substance, harmful physical agent, ergonomic stress, or harmful biological agent that poses or

may pose a recognized hazard to the health of employees. [DOE O 5480.10A (Draft)]

222.

EXPOSURE ASSESSMENT(EA). The systematic collection and analysis of occupational

hazards and exposure determinants such as work tasks; magnitude, frequency, variability,

duration, and route of exposure; and the linkage of the resulting exposure profiles of individuals