IAEA criteria

The IAEA document concerning the General Design Criteria Safety of nuclear power plants Design requirements , was published in 2000 (see www. iaea.org). The IAEA documents of regulatory interest are divided into the following categories  

We will look at the safety requirements eate-gory. Appendix 9 reproduees its hst of eontents. 

Among the main eharacteristies of the IAEA criteria, are the faets that they are reeent and therefore they inelude post-Chemobyl refleetions, they represent a common agreement between many national positions, and they tend to be more generie than other criteria (whieh are more eountry specifie). 

The complete adoption of the Defence in Depth principle has to be noted in its more evolved version, which includes five superimposed levels of defenee, concisely summarized as follows good design, good control, adequate emergency systems, accident management (various levels of seriousness eonsidered), internal and external emergeney plans. 

The IAEA criteria are a constant general referenee in all the international reviews of nuclear plants. 

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These objectives are frequently subdivided into a General Objective, a Radiation Protection Objective and a Technical Objective, for example, in the International Atomic Energy Agency (IAEA) criteria (see www.iaea.org). 

Appendix 3 lists the contents of some other compilations of general design criteria, where EUR, GDC, OPB 88/97 and PUN are compared with the content of IAEA criteria. 

Single failure criterion in the form chosen (similar to the one of the IAEA criteria, that is applied to the group of systems which have to cope with an accident condition). 

This table is intended to serve as a memo for the content of five of the general design criteria for nuclear plants, thought to be rather representative of the overall picture. The first column of the table contains the complete list of the IAEA criteria, which are rather recent and therefore complete. If another criteria has no... 

WHO uncertainty in rejported values is the standard deviation of at least six analyses for each intercomparison sample. IAEA uncertainty is the standard error for the values reported by various laboratories after exclusion of outlying values using Chauvenet s criterion. 

A further important requirement in selecting the starting material is that, after all the processing has been done to produce the end product, a large amount should remain to permit meaningful use of this material over a period of several years. Most producers do not provide details of how much is available for distribution. The IAEA, for its part, has adopted the criterion that, for a trace element reference material, at least 50 kg of the final end product should be produced. In practice, however, some of the reference materials already issued by the IAEA have been produced in amounts as small as 15 kg, and sometimes less (for human hair, HH-1, only 300 g was produced, with the consequence that stocks were exhausted very quickly). 

In IAEA the single failure criterion is formulated in a general and articulated way in GDC it is specifically inserted in various criteria The concept of fail safe is inserted in criterion GDC 23... 

The application of the single failme criterion, as expressed in Ref. [1] and further explained in IAEA Safety Series No. 50-P-l, Application of the Single Eailure... 

Criterion 7. Application of DiD Definition of events outside of estabhshed safety envelope should include DBTs. DiD (per IAEA definition) is a key element of safety philosophy but not a regulatory requirement in the United States. 

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