05000413/FIN-2012009-02
From kanterella
Jump to navigation
Jump to search
Finding | |
|---|---|
| Title | Unit 2 Offsite Power Circuits Inoperable Due to Improper Unit 1 Zone G Modification |
| Description | Self-revealing findings were identified for the licensees failure to follow EDM-141, Procurement Specifications for Services. The licensee did not identify the need for the blocking feature for the instantaneous underfrequency protective function in both the vendor specification and the supporting information provided to the vendor. The offsite power supply to Unit 1 would have been lost anytime there was a generator trip from high power without this blocking feature. This finding resulted in an apparent violation (AV) of Technical Specification (TS) 3.8.1, AC Sources Operating, for Unit 1 and TS 3.8.1, AC Sources Operating, and TS 3.8.2, AC Sources Shutdown, for Unit 2 because the installed modification resulted in inoperability of the offsite power source for both units. Unit 2 was impacted whenever offsite power was provided from Unit 1. The finding does not represent an immediate safety concern because the licensee corrected the blocking function prior to unit restart. The violation was placed in the licensees corrective action program as PIP C- 12-3403. The performance deficiency (PD) was more than minor because it affected the availability and reliability of the Equipment Performance attribute and adversely affected the Mitigating Systems cornerstone objective in that an offsite power supply would not have been available to mitigate expected operational transients and design basis events. For Unit 1, the significance was preliminarily determined to be within the range for a finding of substantial safety significance (Yellow). For Unit 2, the significance was preliminarily determined to be within the range for a finding of greater than very low safety significance (Greater than Green). The safety significance will be designated as To Be Determined (TBD) because the safety characterization is not final. The PD was directly related to the aspect of accurate design documentation in the component of Resources in the cross-cutting area of Human Performance in that the engineering design procedures were not complete because there was no requirement for verification of non safety-related design changes. |
| Site: | Catawba  |
|---|---|
| Report | IR 05000413/2012009 Section 4OA5 |
| Date counted | Jun 30, 2012 (2012Q2) |
| Type: | NCV: Green |
| cornerstone | Mitigating Systems |
| Identified by: | NRC identified |
| Inspection Procedure: | IP 93812 |
| Violation of: | Technical Specification |
| INPO aspect | |
| ' | |
Finding - Catawba - IR 05000413/2012009 | |||||||||||||||||||||||||||||||||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
Finding List (Catawba) @ 2012Q2
Self-Identified List (Catawba)
| |||||||||||||||||||||||||||||||||||||||||||||||