05000361/FIN-2012007-07
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Finding | |
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Title | Unit 3 Steam Generator 3E0-88 Stresses Related to Handling |
Description | The team identified an unresolved item associated with evaluation of excessive shipping induced forces of Unit 3 replacement steam generator 3E-088. The team reviewed the SG shipping accelerometer data reports for both Unit 2 and Unit 3. In addition, the team also reviewed shipping and handling records and identified the following: Different transoceanic shipping companies and ships were used (U2: Happy Ranger, U3: Enchanter) During the discharge from the ship Unit 3 replacement steam generator 3E0-88 (3B) recorded simultaneous signals on the three attached accelerometers. Unit 3 steam generator 3E0-88 was the only steam generator to record simultaneous signals on the three attached accelerometers. Unit 3 steam generators received significantly more accelerometers hits compared to Unit 2.Unit 3 replacement steam generator 3E0-88 accelerometers indicated up to a 1.23 g spike with a simultaneous recording on all three of the attached accelerometers. Mitsubishi provided an evaluation of the forces which showed loads were within allowable stress limits but exceeded stress for an operating basis earthquake. The team was not able to determine if this was properly considered. Additional review by the NRC is required to fully assess if the shipping forces contributed to the tube-to-tube wear in Unit 3 and then determine whether this issue represents a performance deficiency or constitutes a violation of NRC requirements. |
Site: | San Onofre |
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Report | IR 05000361/2012007 Section 4OA5 |
Date counted | Jun 30, 2012 (2012Q2) |
Type: | URI: |
cornerstone | Mitigating Systems |
Identified by: | NRC identified |
Inspection Procedure: | IP 93800 |
Inspectors (proximate) | C Thurston E Collins E Murphy J Ortega Luciano J Reynoso J Rivera Ortiz A Johnsonb Hagarg Werner J Reynoso J Rivera-Ortiz |
INPO aspect | |
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Finding - San Onofre - IR 05000361/2012007 | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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Finding List (San Onofre) @ 2012Q2
Self-Identified List (San Onofre)
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