Table 1: Consequence Levels and Risk Evaluation Guidelines

DOE-STD-1120-2005/Vol. 2

Table 1: Consequence Levels and Risk Evaluation Guidelines

Consequence

Offsite Public

Hypothetical Onsite

Site

Level

Worker

Facility

MOI 1, 2

Worker

MEI3 location not less

Involved worker3

than 100 meters or

facility boundary

within facility

from the point of

boundary

release

Use highest dose

For elevated doses use

within facility

point of highest doses

boundary

For Safety Significant

Considerable on-site

Considerable off-site

designation, consequence

High

impact on people or the

levels such as prompt

environs.

death, serious injury, or

25 rem

significant radiological

> 100 rem TEDE or

> 25 rem TEDE or

100 rem

and chemical exposure,

> ERPG-3/TEEL-3

> ERPG-2/TEEL-2

should be considered.

Considerable on-site

Only minor off-site

impact on people or the

Moderate

environs.

25 rem > 1

≥ 25 rem TEDE or

≥ 1 rem TEDE or

100 rem > 25

> ERPG-2/TEEL-2

> ERPG-1/TEEL-1

Negligible off-site impact

Minor on-site impact on

on people or the

Low

people or the environs.

environs.

< 1 rem

< 25 rem

< 25 rem TEDE or

< 1 rem TEDE or

< ERPG-2/TEEL-2

< ERPG-1/TEEL-1

Notes:

DSA: Documented Safety Analysis

MEI: Maximally-Exposed Collocated Worker

MOI: Maximally-Exposed Offsite Individual

SMP: Safety Management Programs,

Chapters 6-17 of the DSA

SSC:

structures, systems, or components

TSR: Technical Safety Requirements

Offsite consequences that challenge 25 rem must be protected with Safety Class SSCs independent of frequency

Hazard Analyses qualitatively evaluate public consequences at the shortest distance to the site boundary. Accident

Analyses must utilize 95% X/Q for public consequence determination.

Beyond safety-significant SSCs designated for worker safety and their associated TSR coverage, additional worker

safety issues should be covered in TSRs only by administrative controls on overall safety management programs.

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