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Application of the Graded Approach - doe-std-3009-94_cn3_3-30-060081
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Preparation Guide for U
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System Description


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
Page 57


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