05000445/FIN-2008003-03
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Finding | |
|---|---|
| Title | Instrument Tubing Failure Causes Plant Trip |
| Description | The inspectors reviewed a self-revealing finding for the licensee\'s failure to follow a tubing installation specification when installing condenser vacuum instrument tubing. Specifically, the installation did not follow Tubing Specification CPSES-I-1018 for general flexibility or thermal growth considerations, ultimately resulting in tubing failure. The tubing failure caused turbine trip instrumentation to fail low, causing a Unit 2 turbine and reactor trip. The licensee entered the finding into their corrective action program and modified the instrument tubing in both Units 1 and 2 to prevent another failure. The finding is greater than minor because it is associated with the Initiating Events Cornerstone attribute of design control and affected the cornerstone objective, in that it caused a turbine and reactor trip that challenged critical safety functions. The finding is of very low safety significance because, although the likelihood of a reactor trip increased, all mitigating systems were available. The cause of this finding is related to the human performance cross-cutting component of Work Practices, in that, the licensee failed to provide proper oversight of contractors such that nuclear safety is supported H4.c |
| Site: | Comanche Peak  |
|---|---|
| Report | IR 05000445/2008003 Section 1R12 |
| Date counted | Jun 30, 2008 (2008Q2) |
| Type: | Finding: Green |
| cornerstone | Initiating Events |
| Identified by: | Self-revealing |
| Inspection Procedure: | IP 71111.12 |
| Inspectors (proximate) | D Allen B Tindell M Young S Makor P Goldberg L Ricketson P Elkmann C Johnson |
| CCA | H.2, Field Presence |
| INPO aspect | LA.2 |
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Finding - Comanche Peak - IR 05000445/2008003 | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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Finding List (Comanche Peak) @ 2008Q2
Self-Identified List (Comanche Peak)
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