The all-new Division 5 of Section III of the BPVC providesconstruction rules for high-temperature reactors, including bothhigh-temperature, gas-cooled reactors (HTGRs) and liquid-metalreactors (LMRs).  These rules are for components exceeding thetemperature in Division 1 and are meant for components experiencingtemperatures that are equal, to or higher than, 700oF (370oC) forferritic materials or 800oF (425oC) for austenitic stainless steelsor high nickel alloys. 

Importantly, Division 5 also contains the new rules pertainingto graphite core components.  These new rules include generalrequirements, plus design and construction rules, forgraphite.  Irradiation effects on graphite are addressed, asare the features of probabilistic design reflected in thedetermination of graphite material strength properties.

This first edition reflects new, safety-criteria approaches fornuclear power plants—accumulating rules conveniently into one,single book format.  These rules have been updated andimproved over those still in Code Case format.

Various industries are beginning to appreciate the uniqueadvantages that exist with nuclear power plants that operate atelevated temperatures.  For example, HTGRs can yield higheroperating efficiencies, provide not only electrical power but alsoprocess heat for other industries, and can be designed to bepassively-safe. 

Intended for those nuclear facilities and powerplants that experience operating temperatures that exceed thelimits established in Section III, Division 1.  At this time,both high temperature gas-cooled reactors and liquid metal reactorsare identified as being within the scope of these Division 5rules.

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