Hazard Evaluation - DOE-STD-1120-1-20050022

DOE-STD-1120-2005/Vol. 1

(e.g., location of hazardous materials and previous spills or releases).

Assess existing facility conditions and identify inherent hazards by performing a facility

walkdown using a multidisciplined team that includes appropriate subject matter experts.

Review and consider applicable lessons learned reports and DOE Occurrence Reporting

and Processing System database events for the facility, as well as for similar facilities.

The need for intrusive characterization activities (e.g., sampling and analysis) should be

determined based on the collection and evaluation of facility information, the remaining level of

uncertainty regarding existing hazardous substances (i.e., radiological materials, hazardous

chemicals, or hazardous wastes), and the existing facility condition. Consider characterization

activities if there is insufficient knowledge of hazards to understand the hazardous substance

types, quantities, forms, potential exposures, and locations.

Hazard identification data, and its subsequent use in the facility hazard categorization and

analysis, may rely on various characterization results provided that data is sufficiently bounding.

For example, non-destructive examination techniques should fully account for instrument error

when used to estimate material inventory.

3.2.1.2

Hazard Evaluation

This subsection should present the approach used to identify and evaluate hazards, including

hazard evaluation techniques and methods used to qualitatively estimate accident consequences

and likelihood. Ranking or binning schemes applied to hazardous events should also be

described, and where used, should be considerate of all receptors (i.e., public, onsite personnel,

and facility workers). An example of risk binning guidelines is presented in Appendix E that

may be applied to decommissioning projects. A comprehensive discussion of hazard evaluation

methods appropriate for decommissioning can be found in Chapters 4 and 5 of Guidelines for

Hazard Evaluation, prepared by the Center for Chemical Process Safety of the American

Institute of Chemical Engineers.

The presentation of hazard and accident analysis (where required) should be consistent with the

types and anticipated progression of decommissioning activities. For example, if dispersible

radioactive materials are scheduled to be removed prior to initiation of dismantling activities

involving plasma torches, then associated fire hazards may not present a potential accident

initiator at the time when radioactive materials are still in the building. Thus, hazard and

accident analysis information should be consistent with the anticipated types and sequences of

decommissioning activities discussed in Chapter 2 of the DSA.

3.2.2

Hazard Analysis Results

The results of hazard identification and analysis efforts should be presented in this section of the

DSA. The format and guidance provided in Section 3.3.2 of DOE-STD-3009-94 should be

followed, and should be inclusive of subsections related to hazard identification, categorization,

and evaluation. Additional considerations related to the hazard evaluation process for

decommissioning are presented below.

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