05000346/FIN-2011004-06
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Finding | |
|---|---|
| Title | Licensee-Identified Violation |
| Description | TS 5.4.1(a) requires the licensee to establish, implement, and maintain applicable written procedures for the safety-related systems and activities recommended in RG 1.33, Revision 2, Appendix A. Section 9.a, Procedures for Performing Maintenance, of RG 1.33, Revision 2, Appendix A, further states, in part, that: Maintenance that can affect the performance of safety-related equipment should be properly preplanned and performed in accordance with written procedures, documented instructions, or drawings appropriate to the circumstances. Contrary to this requirement, on September 2, 2011, licensee personnel failed to properly rig and lift a new safety-related battery charger (DBC1PN) into position. Specifically, the personnel conducting the rigging activity switched from a four-point lift configuration to a two-point lift configuration when one of the lifting bolts atop the battery charger cabinet was inadvertently sheared off. This lifting configuration change was performed with an approved lift plan that contained inadequate technical/engineering guidance. When the-component was subsequently lifted, unbalanced forces resulting from the two-point lifting configuration caused several welds on the cabinet to crack, rendering the cabinet seismically unqualified. The objective of the Mitigating Systems Cornerstone of Reactor Safety is to ensure the availability, reliability, and capability of systems that respond to initiating events to prevent undesirable consequences (i.e., core damage). A key attribute of this objective is human performance, and specifically, procedure use and adherence. In accordance with NRC IMC 0612, Power Reactor Inspection Reports, Appendix B, Issue Screening, the inspectors determined that the violation was of more than minor significance in that it had a direct impact on this cornerstone objective. The licensees failure to use technically adequate written procedures or instructions for the rigging and lifting configuration resulted in damage to safety-related battery charger DBC1PN that rendered it seismically unqualified and added significant time to it being inoperable. The licensee had entered this issue into their CAP as CRs 2011-02288 and 2011-02290. Corrective actions planned by the licensee include either weld repairs to the cabinet to restore its seismic qualification or replacement of the entire battery charger, and a re-examination of lifting and rigging practices. |
| Site: | Davis Besse  |
|---|---|
| Report | IR 05000346/2011004 Section 4OA7 |
| Date counted | Sep 30, 2011 (2011Q3) |
| Type: | NCV: Green |
| cornerstone | Mitigating Systems |
| Identified by: | Licensee-identified |
| Inspection Procedure: | |
| Inspectors (proximate) | A Wilson D Kimble J Beavers J Maynen J Neurauter J Steffes L Jones M Bielby M Holmberg R Jones T Bilik T Go |
| INPO aspect | |
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Finding - Davis Besse - IR 05000346/2011004 | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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Finding List (Davis Besse) @ 2011Q3
Self-Identified List (Davis Besse)
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