05000275/FIN-2014002-04
Finding | |
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| Title | Licensee-Identified Violation |
| Description | Title 10 of the Code of Federal Regulations, Part 50, Appendix B, Criterion IX, Control of Special Processes, requires that, Measures shall be established to ensure that special processes, including welding, heat treating, and nondestructive testing, are controlled and accomplished by qualified personnel using qualified procedures in accordance with applicable codes, standards, specifications, criteria, and other special requirements. Contrary to the above, during original construction in 1974, the licensee failed to ensur
that a welding process was performed in accordance with the applicable America Society of Mechanical Engineers (ASME) Code requirements. Small bore piping weld connecting vent and drain valves to safety injection pumps were completed according t a welding procedure specification (WPS) that was written for welding carbon steel t stainless steel. The actual welds connected stainless steel components; therefore, th WPS used did not meet ASME B31.7 (Nuclear Power Piping) and ASME Section I (Welding, Brazing, and Fusing Qualifications) requirements. Failure to comply wit ASME Code welding requirements could result in flaws within safety injection syste piping welds. This performance deficiency was more than minor because it wa associated with the mitigating systems cornerstone attribute of design control an adversely affected the cornerstone objective of ensuring the availability, reliability, an capability of systems that respond to initiating events. The safety significance of thi issue was considered very low (Green) because it did not result in a loss of operability o functionality of the safety injection system. The as-built welds were evaluated to hav adequate material properties and were determined not to contain flaws and, therefore did not affect safety injection system operability. This issue was documented in th licensees corrective action program as Notification Report 50600119. |
| Site: | Diablo Canyon  |
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| Report | IR 05000275/2014002 Section 4OA7 |
| Date counted | Mar 31, 2014 (2014Q1) |
| Type: | NCV: Green |
| cornerstone | Mitigating Systems |
| Identified by: | Licensee-identified |
| Inspection Procedure: | |
| Inspectors (proximate) | B Parks C Smith J Reynoso P Jayroe P Kaufman T Hipschman W Walker |
| Violation of: | 10 CFR 50 Appendix B Criterion IX |
| INPO aspect | |
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Finding - Diablo Canyon - IR 05000275/2014002 | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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Finding List (Diablo Canyon) @ 2014Q1
Self-Identified List (Diablo Canyon)
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