Quantcast Methodology - doe-std-3009-94_cn3_3-30-060076

 

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Figure 3-4. Flowchart for performing a nd accident analysis
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DOE-STD -3009-94
3.4.1 Methodology
This section summarizes the methods used to quantify the consequences of
operational accidents, natural external events, and man- made external events
selected in Section 3.3.2.3.5, "Accident Selection." Identify and describe any
computer programs used to implement methods discussed below. Include in the
description the origin of the code, its precedent for use, input data, the range of
variables investigated, the basic analytical models, their interrelationships, and
the progression of the analysis. Briefly summarize and reference detailed
information on algorithms, computational and analytical bases, a nd software
quality assurance measures.
Documentation of methodology should include the following:
Methods used to estimate radiological or other hazardous material source
terms for DBAs including: (1) basic approach for estimating physical
facility damage from DBAs; (2) general basis for assigning material-atrisk
quantities not directly derived from hazard identification, if differing
values are used; and (3) basis for material release and respirable fractions
or release rates used.
Methods used to estimate dose and exposure profiles including
assumptions on variables such as meteorological conditions, time
dependent characteristics, activity, and release rates or duration for
radioactive or other hazardous materials that could be released to the
environme nt.
3.4.2 Design Basis Accidents
This section analyzes DBAs for each of the major categories to quantify
consequences and compare them to the Evaluation Guideline. The major
categories are: internally initiated operational accidents (e.g., fires, explosio ns,
spills, criticality); natural events for the site (e.g., earthquakes, tornadoes) that
could affect the facility; and man- made externally initiated events such as
airplane crashes, transportation accidents, adjacent facility events, etc., that can
either cause releases at the facility under examination or have a major impact on
facility operations. Beyond DBAs are discussed in Section 3.4.3, "Beyond
Design Basis Accidents."
Quantification methods are typically limited to calculating the dose profile of a
release. The process is iterative, starting by taking no credit for mitigative
features and comparing results to the Evaluation Guideline. Continue taking
credit for additional mitigative features incrementally and comparing the results
to the Evaluation Guideline until below the guideline. This iterative process,
however, does not require denying the physical design of facility structures,
systems, and components. For example, if liquid hazardous material is brought
into a facility in steel piping and stored in steel tanks, it is not meaningful to
disregard the existence of these physical features in analysis. Simply admitting
they exist does not require safety-class SSC designation either. Stated another
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