Content Guidance for Sections of Chapter 4

DOE-STD -3009-94

CONTENT GUIDANCE FOR SECTIONS OF CHAPTER 4

4.1

INTRODUCTION

This section provides an introduction to the contents of this chapter based on the

graded approach and includes objectives and scope specific to the chapter as

developed.

4.2

REQUIREMENTS

This section lists the design codes, standards, regulations, and DOE Orders that are

required for establishing the safety basis of the facility. The intent is to provide

only the requirements that are specific for this chapter and pertinent to the safety

analysis, and not a comprehensive listing of all industrial standards or codes or

criteria. SRIDs may be referenced as appropriate.

4.3

S AF E T Y-CLASS SYSTEMS, STRUCTURES, AND COMPONENTS

Relevant information is provided, in the following SSC specific subsections, for

safety-class SSCs with descriptions sufficiently detailed to provide an

understanding of the safety function of safety-class SSCs. Descriptions for each

safety-class SSC must be complete enough to indicate suitability of safety

analysis inputs and assumptions. Provide a summary list of safety-class SSCs.

This summary list should identify, in tabular form, safety-class SSCs, the

accidents from Chapter 3 for which safety-class designation was made, safety

functions, functional requirements, and performance criteria judged to require

TSR coverage. The remaining subsections provide details that correlate to the

summary list.

Note: The following format is repeated sequentially for each ("X") safety-class

SSC. The examples provided are for illustration purposes only, and should not be

construed as a requirement to designate such systems safety-class or safety

significant.

4.3.X [Applicable Safety-class System, Structure, or Component]

Identify the safety-class SSC.

4.3.X.1

Safety Function

This subsection states the reason for designating the SSC as a safety-class

SSC, followed by specific identification of its preventive or mitigative safety

function(s) as determined in the hazard and accident analysis. Do not discuss

non-safety functions.

Safety functions are top level statements that express the objective of the SSC

in a given accident scenario. For example, the safety function of a hydrogen

detector in a dissolver vessel offgas line could be stated as: "To monitor

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