1. Design and Operating Margins Model
Attachment 3
Design and Operating Margins Model
Functional/Design Failure
Greater than design basis range
Design margin
( This is a prohibited range of operation and represents the additional conservative margin to account for uncertainties in design and construction )
Design or Tech Spec Basis Limit
Analyzed transient range
( Design allows operation in the transient range. However operating restrictions consistent with the design, such as the magnitude and frequency of excursions into this range apply)
Operating Point Limit
Operating margin
Allowed operating range
( The allowed operating range provides the normal margins operators use without violating setpoints )
Normal Operating Point