Design Requirements Element

DOESTD107393

procedures. The program management element also ensures that appropriate lower-level or

implementing procedures are in place for each CM program function. These vehicles or mechanisms,

used to implement the program management element, support program implementation by providing

increasing levels of detail to communicate program direction and guidance. CM policy directives

confirm management support for the CM program, establish program scope and terminology, and

establish key roles and responsibilities. CM program plans define specific actions and program

commitments. Action plans go into further detail, describing methods, procedures, staffing, and

schedules to accomplish the program plan commitments. Governing procedures identify the specific

implementing procedures for accomplishing the CM program functions and correlate the implementing

procedures to the CM program plan.

CM programs can be directed and managed at different organizational levels: the corporate level, the

site or division level, and the facility level. Program management and direction need to be consistent

through each level. Where possible, consistent corporate approaches should be pursued. Based on

the structure of most of the operating/managing organizations at DOE facilities, a centralized approach

to CM program development and implementation should be adopted for each site/division. In this top-

down approach, general she/division program policy and criteria are established at the site/division level

(i.e., the prime contractor at a DOE site), with guidance on acceptable implementation variations

allowed for different facilities within the site/division structure. These implementation variations would

be based on individual situations and considerations. Upon receipt of the site/division CM policy

directive, each facility manager should promulgate the information contained within the directive, and

should adapt and expand CM program criteria, consistent with the site/division direction. Site/division

directives should provide the expectations and guidance necessary for facility CM program planning.

Recognizing that the structure of each operating/managing organization is different, an additional

management level might exist between the site/division level and the facility level. In this case,

site/division CM policy directives might be prepared at more than one organizational level. Wherever

the term site/division is used, the appropriate interpretation should be applied.

I-B.2 DESIGN REQUIREMENTS ELEMENT

Design Process. The design process is the technical and management process that begins with the

identification of design inputs and constraints, processes this information, and results in the issuance of

design requirements. For each design, the design process; defines and documents the design inputs;

identifies and adheres to the design constraints; performs and documents the analyses, calculations, and

technical evaluations; and assures that the design outputs are complete and documented. Design

requirements may be changed only through the engineering design process. Figure I-B-1 depicts the

design process to support understanding of these four fundamental parts, described further below.

Design inputs consist of those specific criteria, limits, bases, or other initial requirements (such

as specific functional requirements, specific codes and standards, and specific regulatory

commitments) upon which the detailed final design is based. In comparison to design

constraints, design inputs are specific in nature; they are specific to one design activity. For

example, a design input for a given air-operated valve might be that it needs to open in 10

seconds against a pressure differential of 100 psig.

Design constraints are those general restrictions and limits to the engineering design process

that ensure consistency and quality of designs (such as general codes and standards, general

regulatory commitments, quality assurance requirements, engineering procedures and good

practices, and adopted design methodologies). In comparison to design inputs, design

constraints are general in nature; they apply to multiple classes and categories of designs and,

I-B-3