Generic design assessment

Figure 1.1 APIOOO Generic Design Assessment Document Structure...

New Nuclear Power Stations, Generic Design Assessment, A Guide to the Regulatory Process, Version 2, August 2008. 

WEC, UKP-GW-GL-012, Rev. 0, Generic Design Assessment Summary of Disposability Assessment for Wastes and Spent Fuel arising from Operation of the Westinghouse Advanced Passive Pressiuised Water Reactor (APIOOO), September 2009. 

WEC, UKP-GW-GL-045, Rev. 0, Project Quality Plan forthe U.K Generic Design Assessment, 2008. 

As a result, the Design Basis initiating events with a frequency of greater than 10-3 per year will be reviewed to demonstrate that a diverse safety system, qualified to an appropriate standard, is provided for each safety function. This extension to the DBA will be reported in Step 4 of the Generic Design Assessment (GDA). 

UK Environment Agency letter WEC70020R, Generic Design Assessment - Regulatory Issue RI-AP 1000-0001, Revision 0 , C Grundy, February 1, 2008. 

Aker Solutions, 63000333-000-000-0005, Rev 2, Technical Specification for Decommissioning Strategy for the AP 1000 Generic Design Assessment, August 2008. 

The process to build these reactors in the UK began some years previously, and detailed proposals were submitted to the UK s nuclear safety regulator, the Office of Nuclear Regulation (ONR), in 2009, for the Generic Design Assessment (GDA). The original proposal for the l C architecture is shown in simplified form in Fig. 2.8. Notable features of this architecture are as follows. 

As a result of the Generic Design Assessment, the UK regulator requested significant changes in the I C architecture [4,5]. In particnlar,... 

The regulatory body should require the manufacturer of consumer products to apply to the regulatory body and receive authorization to supply products to the public to ensure that consumer products meet all the requirements for design and performance that were taken into account in the generic safety assessment. The manufacturer should provide the regulatory body with sufficient documentation and certification to enable it to review and assess the proposed product. The documentation should include the following ... 

Because of the improved reliability of the Emergency Feedwater System design, the unavailability for the system was estimated from PRA studies to be in the range of 1 x E-4 to 1 x E-5 per demand as described in CESSAR-DC, Section 10.4.9.1.2. Analysis identified in CESSAR-DC, Appendix lOA, which was developed using generic data assesses the systems ability to function on demand and demonstrates its compliance with the above unavailability range. Therefore, the EFW system meets the recommended unavailability goal of 1 x E-4 per demand identified in SRP Section 10.4.9, Rev. 2. 

Phase 1 is the Nil assessment of the safety case for a generic design, leading to the issue of a design acceptance confirmation (DAC) if the outcome is positive. 

The impact of several of these parameters on the safe operation of the generic design has been assessed in detail in AP 1000 External Hazards Topic Report (Reference 3.2). These assessments include the possible influence of climate change, based on the information provided in the UK Climate Projections reports 2009study (UKCP09), with the key findings presented in a Briefing Report (Reference 3.4 ... 

WEC, UKP-GW-GL-029, Rev 0, 2009, APIOOO Generic Design Measurement and Assessment of Discharges. 

When the data for a situation of specihc interest are inadequate, a common approach is to make some use of more generic information, including possibly information less representative of the situation of specific interest. For example, if the information for a specihc pesticide is inadequate, then some features of an analysis may be based on information from a set of other pesticides, considered to be comparable. This can be appropriate particularly for an early-tier assessment, in which case the criteria may be designed to be protective, so far as we can judge. 

After the materials flows and environmental impacts of a product or a process have been assessed, the next step is to design a strategy for improvement. The techniques for doing so are generically called design for environment (DFE) (Fava et al., 1992). 

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