Chapter 3 Hazard and Accident Analyses

DOE-STD -3009-94

Chapter 3

Hazard and Accident Analyses

PU R P O S E . The purpose of this DSA chapter is to provide information that will satisfy

the requirements of 10 CFR 830 to evaluate normal, abnormal, and accident conditions,

including consideration of natural and man- made external events, identification of energy

sources or process that might contribute to the generation or uncontrolled release of

radioactive and other hazardous materials, and consideration of the need for analysis of

acc idents which may be beyond the design basis of the facility.

This chapter describes the process used to systematically identify and assess hazards to

evaluate the potential internal, man- made external, and natural events that can cause the

identified hazards to develop into accidents. This chapter also presents the results of this

hazard identification and assessment process. Hazard analysis considers the complete

spectrum of accidents that may occur due to facility operations; analyzes potential

accident consequences to the public and workers; estimates likelihood of occurrence;

identifies and assesses associated preventive and mitigative features; identifies safety-

significant SSCs; and identifies a selected subset of accidents, designated DBAs, to be

formally defined in accident analysis. Subsequent accident analysis evaluates these DBAs

for comparison with the Evaluation Guideline. This chapter covers the topics of hazard

identification, facility hazard categorization, hazard evaluation, and accident analysis.

Expected products of this chapter, as applicable based on the graded approach, include:

Description of the methodology for and approach to hazard and accident analyses.

Identification of hazardous materials and energy sources present by type, quantity,

form, and location.

Facility hazard categorization, including segmentation in accordance with DOE-

STD-1027.

Identification in the hazard analysis of the spectrum of potential accidents at the

facility in terms of largely qualitative consequence and frequency estimates. The

summary of this activity will also include:

-- Identification of planned design and operational safety improvements.

-- Summary of defense in depth, including identification of safety-significant

SSCs, SACs and other items needing TSR coverage in accordance with10

CFR 830.

-- Summary of the significant worker safety features, including identification

of safety-significant SSCs and any relevant programs to be covered under

TSR and administrative controls., including those controls designated as

SACs.

-- Summary of design and operational features that reduces the potential for

large material releases to the environment.

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