05000254/FIN-2010003-01
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Finding | |
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| Title | Loss of Power to Freeze Seal Machines During OPDRV |
| Description | A finding of very low safety significance and a NCV of 10 CFR Part 50.65(a)(4) was self-revealed on March 25, 2010, when operators turned off the electrical power to one of the two electrical freeze seal machines being used to apply a reactor coolant system boundary freeze seal. Specifically, plant staff did not identify the interrelation between the mechanical freeze seal activity and the operations electrical power switching activity during risk assessment activities, and, therefore, did not manage the work activities to prevent loss of power to the freeze seal machines providing the credited boundary to prevent draining the reactor vessel. Immediate corrective actions included restoration of power to the machine and reestablishment of freeze seal temperature
The finding was determined to be more than minor because required risk management actions were not implemented. These risk management actions were associated with the Barrier Integrity Cornerstone attribute of Configuration Control and affected the cornerstone objective of providing reasonable assurance that the reactor coolant system boundary protects the public from radionuclide releases caused by accidents of events. The inspectors used IMC 0609, Significance Determination Process, Appendix G, Shutdown Operations - Significance Determination Process, Attachment 1, Shutdown Operations - Significance Determination Process: Phase 1 Operational Checklist for Both PWRs and BWRs, and determined that since key safety functions were maintained, the issue screened as Green. The inspectors identified a cross-cutting aspect associated with this finding in Human Performance - Resources, Procedures (H.2(c)). Although the engineering documentation evaluating the risk in using the electric freeze seal machine recommended the power supplies be protected by operations, this information was not translated into the freeze seal procedure, MA-AA-736-610, or the applicable work package. |
| Site: | Quad Cities  |
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| Report | IR 05000254/2010003 Section 4OA2 |
| Date counted | Jun 30, 2010 (2010Q2) |
| Type: | NCV: Green |
| cornerstone | Barrier Integrity |
| Identified by: | Self-revealing |
| Inspection Procedure: | IP 71152 |
| Inspectors (proximate) | W Slawinski M Ring J Mcghee E Coffman B Cushman D Sand C Mathews |
| CCA | H.7, Documentation |
| INPO aspect | WP.3 |
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Finding - Quad Cities - IR 05000254/2010003 | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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Finding List (Quad Cities) @ 2010Q2
Self-Identified List (Quad Cities)
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