05000305/FIN-2011004-06
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Finding | |
|---|---|
| Title | Incorrect Transformer Load Tap Changer Setting Causes Inoperable Offsite Power |
| Description | A finding of very low safety significance and associated non-cited violation of Technical Specification 3.8.1 was self-revealed for the failure to maintain a switchyard transformer load tap changer (LTC) at the appropriate setting for the predicted post-trip voltage of offsite power. The incorrect setting resulted in the inoperability of the Reserve Auxiliary Transformer (RAT) offsite power source. The licensees corrective actions included restoring the RAT supply transformer (RST) LTC to an appropriate setting, creating a short-term standing order to prevent operation of the RST LTC outside settings that were supported by the existing interface agreement with the transmission system operator. The licensee performed an apparent cause evaluation, a root cause analysis and also, as a long-term corrective action, modified procedure OP-KW-NOP-SUB-003 to prevent operation of the RST LTC outside settings that were supported by the existing interface agreement with the transmission system operator. The finding was determined to be more than minor because the finding was associated with the Mitigating Systems Cornerstone attribute of configuration control 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 as having very low safety significance (Green). This finding has a cross-cutting aspect in the area of human performance, resources, because the licensee did not maintain complete, accurate, and up-to-date procedures for the use of the RST LTC following its installation during the spring 2011 outage |
| Site: | Kewaunee  |
|---|---|
| Report | IR 05000305/2011004 Section 4OA3 |
| Date counted | Sep 30, 2011 (2011Q3) |
| Type: | NCV: Green |
| cornerstone | Mitigating Systems |
| Identified by: | Self-revealing |
| Inspection Procedure: | IP 71153 |
| Inspectors (proximate) | M Kunowski R Krsek K Barclay R Edwards L Rodriguez |
| CCA | H.7, Documentation |
| INPO aspect | WP.3 |
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Finding - Kewaunee - IR 05000305/2011004 | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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Finding List (Kewaunee) @ 2011Q3
Self-Identified List (Kewaunee)
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