What is a design basis in nuclear?

Definition. Information that identifies the specific functions to be performed by a structure, system, or component of a facility, and the specific values or range of values chosen for controlling parameters as reference bounds of design.

What is a design basis document?

(BOD) The Basis of Design (BOD) documents the principles, assumptions, rationale, criteria, and considerations used for calculations and decisions required during design. The BOD is developed by the Designer and builds upon the PC and OPR.

What is the meaning of design basis?

The DB is defined as a set of conditions, needs, and requirements (including legal requirements) taken into account in designing a facility or product.

What is a design basis earthquake?

design-basis earthquake (DBE): “That earthquake for which the safety systems are designed to remain functional both during and after the event, thus assuring the ability to shut down and maintain a safe configuration.”

What should be included in a basis of design?

The Basis of Design document includes information on the whole project and explains in detail the systems, client expectations, why the systems were selected and design. The Design Criteria usually only includes a list of expected design information, in tables, that should be met.

What is beyond design-basis?

Beyond design-basis are accidents that are outside the realm of what the plant was designed to withstand. The classic example is the Fukushima nuclear accident. Beyond design-basis events are difficult to predict either because they have never occurred or have a low probability of occurring.

What is a basis of design product?

Basis-of-Design Product: Where Specifications name a product, or refer to a product indicated on Drawings, and include a list of manufacturers, provide the specified or indicated product or a comparable product by one of the other named manufacturers.

What is the difference between preliminary design and detailed design?

During detailed design and optimization, the parameters of the part being created will change, but the preliminary design focuses on creating the general framework to build the project on.

What is MCE and DBE?

The MCE (Maximum Credible Earthquake) is the most severe earthquake effects considered by this standard. The DBE (Design Basic Earthquake) is the earthquake effects which can reasonably be expected to occur at least once during the design life of the structure.

What is maximum considered earthquake?

MCEs. In a normal seismic hazard analyses intended for the public, that of a “maximum considered earthquake”, or “maximum considered event” (MCE) for a specific area, is an earthquake that is expected to occur once in approximately 2,500 years; that is, it has a 2-percent probability of being exceeded in 50 years.

What is a BOD document?

The Basis of Design (BoD) document records the thought processes and assumptions behind major design decisions being made to meet the Owner’s Project Requirements (OPR). The OPR is intended to capture “what” the Institution and User need and expect from the project.

What is beyond design basis accident?

This term is used as a technical way to discuss accident sequences that are possible but were not fully considered in the design process because they were judged to be too unlikely.

What is the nuclear industry Good Practice Guide?

This Good Practice Guide is produced by the Nuclear Industry. It is not prescriptive but offers guidance and in some cases a toolbox of methods and techniques that can be used to demonstrate compliance with regulatory requirements and approaches. [Design Basis Assessment (DBA) Schemes] Page viii Contents

What is the design basis assessment (DBA) scheme page 9?

[Design Basis Assessment (DBA) Schemes] Page 9 inputted into the DBA scheme to determine if this needs to be subject to full DBA assessment. 2.5.6 Independence should be shown between the condition and the initiators under consideration. Control measures on the condition may need to be justified specifically in the safety case.

What is design basis scheme c?

8.1.3 Design Basis Scheme C is intended for decommissioning activities, not for operational power stations. 8.1.4 Design Basis Scheme C has two DBA regions, but also introduces the concept of formally having a Low Consequence Methodology (LCM) region.

What is the purpose of the nuke safety guide?

It aims to provide a tool kit of methods and processes that nuclear operators can use if appropriate to their sites and facilities. These guides are intended to improve the standardisation of approach to the delivery of fit for purpose safety cases, while improving quality and reducing the cost of production.