Table 3-3. Qualitative severity classification table

DOE-STD -3009-94

Table 3-3. Qualitative severity classification table.

Descriptive Word

Description

Negligible on-site and off-site

impact on people or the

environs.

Low

Minor on-site and negligible

off-site impact on people or

the environs.

Moderate

Considerable on-site impact

on people or the environs;

only minor off-site impact.

High

Considerable on-site and off-

site impacts on people or the

environs.

Table 3-4. Qualitative likelihood classification table.

Estimated annual

Descriptive

likelihood of

word

occurrence

Description

10-1>p>10-2

Anticipated

Incidents that may occur several

times during the lifetime of the

facility. (Incidents that commonly

occur)

10-2>p>10-4

Unlikely

Accidents that are not anticipated

to occur during the lifetime of the

facility. Natural phenomena of

this probability class include:

Uniform Building Code-level

earthquake, 100 -year flood,

maximum wind gust, etc.

10-4>p>10-6

Extremely

Accidents that will probably not

Unlikely

occur during the life cycle of the

facility. This class includes the

design basis accidents.

10-6>p

Beyond Extremely

All other accidents.

Unlikely

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