Embrittlement operating rules

In the US approach, primarily Regulatory Guide 1.99, Revision 2 (NRC, 1988) is used for normal plant operation and Part 50.61 of Title 10 of the Code of Federal Regulations (NRC, 2010a) is used for PTS evaluations these two methods use the same embrittlement correlation. 10 CFR Part 50.61a (NRC, 2010b), the alternative PTS rule, uses a newer correlation for... 

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