05000327/FIN-2007006-02: Difference between revisions
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| identified by = NRC | | identified by = NRC | ||
| Inspection procedure = IP 71111.21 | | Inspection procedure = IP 71111.21 | ||
| Inspector = J Rivera, | | Inspector = J Rivera-Ortiz, R Taylor, R Moore, W Fowler, S Kobylarz, M Lewis, T Tinkel | ||
| CCA = N/A for ROP | | CCA = N/A for ROP | ||
| INPO aspect = | | INPO aspect = | ||
| description = The team identified a violation of Technical Specification 6.8.1 associated with TVA\'s failure to develop a procedure that will provide periodic inspection and replacement of the EDG room electrical panel ventilation air filters at the Sequoyah Nuclear Plant. This resulted in a fourteen year period between 1993 and present, for which the filters were not inspected and replaced for all four diesel generator rooms. Description. The diesel generator room ventilation system consists of one air supply fan, one air duct that splits to provide ventilation air to the generator and the electrical panels, and one air filter located in the ductwork before the electrical panels. The purpose of the filter is to provide a clean supply of air in order to prevent debris accumulation in the panel, which could affect various electrical components. In the event the filter becomes clogged, due to long-term use, internal temperature limits for various electrical components associated with generator excitation controls could be impacted. This would affect the long-term reliability of the EDG to provide adequate voltage and power to its associated bus during its mission time. Analysis. TVA\'s failure to develop a procedure that will provide periodic inspection and replacement of the EDG room electrical panel ventilation air filter is a performance deficiency associated with the Mitigating Systems cornerstone. The finding is greater than minor because it is associated with the Mitigating Systems cornerstone attribute of procedure quality and affects the cornerstones objective of ensuring the availability, reliability, and operability of the emergency diesel generators to perform their safety function during an initiating event, such as, a loss of offsite power. This finding was reviewed for cross-cutting aspects and none were identified. | | description = The team identified a violation of Technical Specification 6.8.1 associated with TVA\'s failure to develop a procedure that will provide periodic inspection and replacement of the EDG room electrical panel ventilation air filters at the Sequoyah Nuclear Plant. This resulted in a fourteen year period between 1993 and present, for which the filters were not inspected and replaced for all four diesel generator rooms. Description. The diesel generator room ventilation system consists of one air supply fan, one air duct that splits to provide ventilation air to the generator and the electrical panels, and one air filter located in the ductwork before the electrical panels. The purpose of the filter is to provide a clean supply of air in order to prevent debris accumulation in the panel, which could affect various electrical components. In the event the filter becomes clogged, due to long-term use, internal temperature limits for various electrical components associated with generator excitation controls could be impacted. This would affect the long-term reliability of the EDG to provide adequate voltage and power to its associated bus during its mission time. Analysis. TVA\'s failure to develop a procedure that will provide periodic inspection and replacement of the EDG room electrical panel ventilation air filter is a performance deficiency associated with the Mitigating Systems cornerstone. The finding is greater than minor because it is associated with the Mitigating Systems cornerstone attribute of procedure quality and affects the cornerstones objective of ensuring the availability, reliability, and operability of the emergency diesel generators to perform their safety function during an initiating event, such as, a loss of offsite power. This finding was reviewed for cross-cutting aspects and none were identified. | ||
}} | }} | ||
Latest revision as of 20:34, 20 February 2018
| Site: | Sequoyah  |
|---|---|
| Report | IR 05000327/2007006 Section 1R21 |
| Date counted | Sep 30, 2007 (2007Q3) |
| Type: | NCV: |
| cornerstone | Mitigating Systems |
| Identified by: | NRC identified |
| Inspection Procedure: | IP 71111.21 |
| Inspectors (proximate) | J Rivera-Ortiz R Taylor R Moore W Fowler S Kobylarz M Lewis T Tinkel |
| INPO aspect | |
| ' | |