PURPOSE AND SCOPE OF THE ROOT CAUSE …

PURPOSE AND SCOPE OF THE root CAUSE analysis REPORTP urposeDetermine the root and contributing causes for Reactor pressure vessel closure head (RPV head)damage experienced at nozzle 3 and minor corrosion at nozzle 2, to support the operabilitydetermination for the station s as-found condition and the future repair early in the development of the response to this condition, it became clear that the technicalcauses behind the cracking of the Control Rod Drive Mechanism (CRDM) nozzles and theensuing corrosion of the head material would draw much attention and comparison to thepreviously developed body of knowledge on related topics and conditions. In fact, the possibilityof nozzle cracks existing at Davis-Besse was well recognized prior to the condition, but theidentified significant damage to the RPV head had not been unexpected finding of the significant damage at Davis-Besse immediately became a concern,both for the possible extent of condition implications at Davis-Besse and the potential impact tothe industry.

PURPOSE AND SCOPE OF THE ROOT CAUSE ANALYSIS REPORT Purpose Determine the root and contributing causes for Reactor Pressure Vessel closure head (RPV head)

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  Analysis, Pressure, Causes, Vessel, Heads, Root, Creator, Root cause analysis, Root causes, Reactor pressure vessel

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