05000456/FIN-2013005-04
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Finding | |
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Title | Licensee-Identified Violation |
Description | Braidwood TS 3.7.8, Essential Service Water System, states, in part, that two unit-specific SX trains shall be operable. Technical Specification 3.8.1, Alternating Current (AC) Sources Operating, states, in part, that two EDGs capable of supplying the onsite Class 1E AC electrical power distribution shall be operable. If one unit specific SX train is inoperable, Condition A of TS 3.7.8 requires the licensee to enter the applicable conditions of TS 3.8.1 for the EDG made inoperable by the inoperable SX train. Contrary to the above, on August 1, 2013, the licensee failed to properly determine that operability of the 1A SX and 1A EDG could not be supported and subsequently failed to enter TS 3.7.8 and 3.8.1, as required. Specifically, the licensee initially applied ASME Code Case 513-3 after identifying a pinhole leak on an elbow fitting on the SX return isolation line from the 1A EDG and concluded that the SX train was operable. However, upon re-evaluation, the licensee identified that operability in accordance with ASME Code Case 513-3 was limited to straight pipe and not elbow fittings. On August 2, 2013, the licensee declared the 1A SX train and 1A EDG inoperable and entered TS 3.7.8 Condition A; TS 3.8.1 Condition B; and Technical Requirements Manual 3.0.c. Weld repairs were completed and operability was supported on August 3, 2013. The inspectors determined the performance deficiency was more than minor because it was associated with the Equipment Performance and Configuration Control attributes of the Mitigating Systems Cornerstone and adversely affected the cornerstone objective of ensuring the availability, reliability, and capability of systems that respond to initiating events to prevent undesirable consequences (i.e., core damage). The inspectors screened the finding using IMC 0609, Appendix A, The Significance Determination Process for Findings At-Power, answered No to all of the Mitigating System Screening questions, and determined the finding was one of very low safety significance (Green). This issue was entered into the licensees CAP as IR 1542372, Essential Service Water Piping Leak - 1SX27DA, dated August 1, 2013. As part of the licensees corrective actions, Operability Determination procedure OP-AA-108-115 was planned to be revised to provide clearer guidance regarding the application of ASME Code Case 513-3. |
Site: | Braidwood ![]() |
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Report | IR 05000456/2013005 Section 4OA7 |
Date counted | Dec 31, 2013 (2013Q4) |
Type: | NCV: Green |
cornerstone | Mitigating Systems |
Identified by: | Licensee-identified |
Inspection Procedure: | |
Inspectors (proximate) | A Garmoe E Duncan J Benjamin J Corujo Sandin J Laughlin J Neurauter J Steffes M Perry N Feliz Adorno R Ng T Go |
Violation of: | Technical Specification - Procedures Technical Specification |
INPO aspect | |
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Finding - Braidwood - IR 05000456/2013005 | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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Finding List (Braidwood) @ 2013Q4
Self-Identified List (Braidwood)
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