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Title: Margin of Safety Definition and Examples Used in Safety Basis Documents and the USQ Process

The Nuclear Safety Management final rule, 10 CFR 830, provides an undefined term, margin of safety (MOS). Safe harbors listed in 10 CFR 830, Table 2, such as DOE-STD-3009 use but do not define the term. This lack of definition has created the need for the definition. This paper provides a definition of MOS and documents examples of MOS as applied in a U.S. Department of Energy (DOE) approved safety basis for an existing nuclear facility. If we understand what MOS looks like regarding Technical Safety Requirements (TSR) parameters, then it helps us compare against other parameters that do not involve a MOS. This paper also documents parameters that are not MOS. These criteria could be used to determine if an MOS exists in safety basis documents. This paper helps DOE, including the National Nuclear Security Administration (NNSA) and its contractors responsible for the safety basis improve safety basis documents and the unreviewed safety question (USQ) process with respect to MOS.
Authors:
Publication Date:
OSTI Identifier:
1134068
Report Number(s):
DOE/NV/25946‐‐1891
DOE Contract Number:
DE-AC52-06NA25946
Resource Type:
Conference
Resource Relation:
Conference: Energy Contractors Owners Group Safety Analysis Working Group, November 2013
Research Org:
Nevada Test Site/National Security Technologies, LLC (United States)
Sponsoring Org:
USDOE National Nuclear Security Administration (NNSA)
Country of Publication:
United States
Language:
English
Subject:
98 NUCLEAR DISARMAMENT, SAFEGUARDS, AND PHYSICAL PROTECTION margin of safety; safety basis; USQ