Click here to make your Home Page

Page Title: Appendix II-A Design Control
Up | Next

Click here for thousands of PDF manuals




Information Categories
.... Administration
Food and Cooking
Nuclear Fundamentals


Design controls are the measures established to assure that the design process activities are carried
out in a planned, orderly, correct, and documented manner. These controls assure the quality of the
design requirements and design basis obtained through the design process. Design controls are
constraints to the design process that ensure the following results: the correct identification of design
inputs and constraints; the design analysis and calculations are complete and correct; and the design
outputs are complete and consistent with the design basis. Design controls are implemented through
DOE 5700.6C, Quality Assurance, defines DOE design control requirements. ANSI/ASME NQA-1,
Quality Assurance Requirements for Nuclear Power Plants, provides additional guidance on design
control. Examples of design controls include:
Organizational responsibility for design functions
Training and qualification of engineering personnel
Information exchange and interface controls
Controls for preparation, review, approval, release, and revision of design documents
Document controls for maintenance and retention of design documents
Identification of appropriate design inputs and constraints
ldentification of required design output documents
Identification of required changes to facility configuration documents
Determination of quality levels, and acceptance standards
Programs to track cumulative effects of design changes
Design verification reviews
Requirements for and performance of design assurance reviews
Conduct of audits and management reviews
Conduct of corrective action programs
Design controls should provide some measure of assurance that proposed changes do not incorporate
the same design deficiencies built into the original design, if any exist. The design engineering
organization should not blindly accept previous design work as correct. Rather, it should maintain a
questioning attitude that considers the credentials, vintage, methods, and assumptions of previous
design work. Design controls should call for reasonableness checks of key calculations and
assumptions, and other calculations on a sample basis. In cases in which the original design is suspect
and in other specified cases, a zero-basis justification should be performed. The zero-basis justification
involves a clean sheet approach to critically review or reanalyze the system design requirements to an
appropriate interface point. Further, whenever new design requirements are issued for SSCs with
incomplete, inadequate, or missing design basis, critical portions of the SSCs' design basis should be
re-established at that time.
Programs to track cumulative effects of design changes are important design controls that are
sometimes overlooked. Critical load growths should be identified for tracking. If untracked, these load
growths might exceed the design capacities or design assumptions. Design verification checklists may
be used to track cumulative effects for variable design features such as loads on batteries or
emergency diesels, heatloads in equipment rooms, or weight loads on structures, including cable trays.
The checklist could identify the need to update the applicable load lists and take other necessary
actions. This approach can ensure that the design constraints imposed by previous designs are met.

Privacy Statement - Press Release - Copyright Information. - Contact Us

Integrated Publishing, Inc. - A (SDVOSB) Service Disabled Veteran Owned Small Business