05000390/FIN-2009002-01
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Finding | |
|---|---|
| Title | Auxiliary Feedwater System Compliance with General Design Criterion 2 |
| Description | The inspectors identified an unresolved item (URI) involving compliance of the AFW System with General Design Criterion 2. This URI will remain unresolved pending additional information from the licensee to determine if a violation of regulatory requirements occurred. On March 9-11, 2009, inspectors performed a routine inspection of the AFW system in accordance with Inspection Procedure 711111.04 Equipment Alignment. This inspection also used the insights gained in Operating Experience Smart Sample (OpESS) Negative Trend and Recurring Events Involving Feedwater Systems. During their review of operating experience, the inspectors noted that a failure of an AFW pumps had occurred at the Callaway Plant in 2002 due to debris generated from a degraded diaphragm in the condensate storage tank (CST). The inspectors examined system diagrams and confirmed that at Watts Bar there were no screens or other devices which would prevent debris from the CSTs from impacting the safety related auxiliary feed water pumps. The inspectors noted that the CSTs were not safety-related and were not protected from earthquakes or tornadoes. The inspectors also determined that the CSTs were lined with an epoxy phenolic coating which was routinely repaired during plant outages. However, if this coating became dislodged in sufficient quantities during normal operations or if an earthquake or other natural phenomena would cause CST debris, the AFW pumps could be adversely impacted. The UFSAR identified the AFW system as a safety-related system which is protected from the effects of natural phenomena. The UFSAR also stated that the plant complies with the requirements of General Design Criterion (GDC) 2, in that, structures, systems, and components important to safety shall be designed to withstand the effects of natural phenomena such as earthquakes, tornadoes, hurricanes and floods. Pending additional information from the licensee involving potential for CST debris and its impact on the AFW system and compliance with GDC 2, this item is identified as URI 050000390/2009002-01, Auxiliary Feedwater System Compliance with General Design Criterion 2 |
| Site: | Watts Bar  |
|---|---|
| Report | IR 05000390/2009002 Section 1R17 |
| Date counted | Mar 31, 2009 (2009Q1) |
| Type: | URI: |
| cornerstone | Mitigating Systems |
| Identified by: | NRC identified |
| Inspection Procedure: | IP 71111.17 |
| Inspectors (proximate) | R Monk R Hamilton W Loo E Guthrie M Coursey K Millerd Mas Penarandah Gepford J Hamman M Pribish P Higgins R Lewis R Monk T Fanelli |
| INPO aspect | |
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Finding - Watts Bar - IR 05000390/2009002 | |||||||||||||||||||||||||||||||||||||||||||||||||||||
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Finding List (Watts Bar) @ 2009Q1
Self-Identified List (Watts Bar)
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