FATIGUE DAMAGE TO SONGS STEAM GENERATORS
J. Hopenfeld
Provided to the “DAB Safety Team” as additional explanation of the fatigue damage to SONGS steam generators which was discussed in a report by the author and was submitted to the California Public Utility Commission on March 29, 2013
SCE/MHI made a mistake in their stress analysis, which directly impacts the safety of restarting Unit 2. When the error is corrected, the result clearly shows that Unit 2 has already used up its allowed fatigue life and is not fit for service any longer. This means that if Unit 2 is restarted at any power level an abrupt pressure change such as inadvertent closing or opening of a valve or a steam line break could lead to a sudden tube ruptures. The ASME code and NRC regulations do not permit safety components to operate when their fatigue life has been exhausted
more: Why fatigue damage will stop the NRC from allowing Unit 2 to restart | Decommission San Onofre
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