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Linkage to the Documented Safety Analysis cont'd
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Need for Consideration of Beyond Design Basis Accidents


DOE-STD-3007-2007
A linking document (referred to in this standard as a "Criticality Control Review" or CCR) should be
used to summarize the results of this evaluation process for criticality hazards and controls. The process
leading to the development of the CCR should be specified as part of the CSP description document. The
CSP should also document how revisions and updates to the CCR and CSEs are treated relative to the
USQ process. The advantages to development of a CCR are:
1. The CCR now becomes the technical reference to the DSA for criticality safety; and
2. The CCR allows summarizing several CSEs for a process or a facility in a single document so
that identification of commonly important attributes and controls is possible.
A. CLASSIFICATION OF HAZARD CONTROLS AND TECHNICAL SAFETY
REQUIREMENTS
The process of selecting hazard controls includes classification of them as safety class SSCs, safety
significant SSCs; design features; administrative controls that are major contributors to defense in depth,
which are designated as specific administrative controls; or a lesser category, sometimes described as
SSCs important to safety; and administrative controls. DOE-STD-1186-2004, Specific Administrative
Controls, provides guidance applicable to specific administrative controls. DOE G 421.1-2, Section 5.3
provides a general discussion of the hierarchy of safety controls.
All controls needed for safety (criticality related, radiation safety, industrial safety, etc.) are identified and
characterized during the course of the hazards and accident analyses performed in support of the DSA. A
subset of all controls will usually get safety class or safety significant designation. Controls that are
identified and discussed in CSEs may or may not end up being elevated to the level of TSRs or identified
in the DSA. Depending on the situation, NCS controls that are incorporated into the DSA would be
TSRs, design features, or administrative controls. DSA-level controls should be identified on a case-by-
case basis and should be graded according to the guidance in DOE-STD-3009-94, Change Notice No. 3 or
successor document to establish the hierarchy of hazard controls. Hierarchy requires that engineering
controls with an emphasis on safety-related SSCs be preferable to administrative controls or specific
administrative controls14 due to the inherent uncertainty of human performance. Specific administrative
controls14 may be used to help implement a specific aspect of a programmatic administrative control that
is credited in the safety analysis and, therefore, has a higher level of importance.
16


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