Use of Fission Reactor Terminology and Concepts

DOE-STD-6002-96

designer the flexibility to develop a safety classification scheme using a graded

approach that best fits the fusion facility and avoids the pitfalls and burdens associ-

ated with this fission concept. The Requirements Standard does not invoke the

single failure criterion as a requirement. Instead, broader requirements in terms of

redundancy, diversity, and independence are employed to give the designer flexibility

in achieving overall reliability/unavailability goals for items that implement safety.

However, in the Guidance Standard (DOE-STD-6003-96), both concepts are used

because of their prevalence in the existing DOE Order structure and because the

goal of the document is to indicate a recommended way to implement the require-

ments set forth in the Requirements Standard for a fusion facility within the DOE

regulatory system. Thus, these concepts can be used to achieve safety but are not

specified as requirements in DOE-STD-6002-96.