05000313/FIN-2009003-04
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Finding | |
|---|---|
| Title | Trip of a Main Feed Pump Due to Electromagnetic Interference |
| Description | The inspectors documented a self-revealing finding associated with the trip of main feed pump P-1B on April 9, 2009. Specifically, the main feed pump tripped due to an intermittent electromagnetic interference signal. This interference caused the digital speed monitor to sense an over speed condition and generate a trip signal for the main feed pump turbine, when no such condition actually existed. This issue was the result of the licensee not properly implementing a modification whose purpose it was to noise harden the main feed pumps control cabinets. The licensee entered this issue into their corrective action program as Condition Report CR-ANO-1-2009-0760. The performance deficiency was more than minor because it affected the design control attribute of the Initiating Events Cornerstone, and it directly affected the cornerstone objective to limit the likelihood of those events that upset plant stability during power operations. Using Inspection Manual Chapter 0609, Significance Determination Process, Phase 1 Worksheet, this finding was determined to have very low safety significance because it did not contribute to both the likelihood of a reactor trip and the likelihood that mitigation equipment or functions would not be available. The finding was determined to have a crosscutting aspect in the area of problem identification and resolution associated with the corrective action program P.1(c), in that the licensee failed to thoroughly evaluate problems such that the resolutions address causes and extent of conditions, as necessary. This is indicative of current plant performance because the licensee continues to inadequately evaluate issues and develop appropriate resolution |
| Site: | Arkansas Nuclear  |
|---|---|
| Report | IR 05000313/2009003 Section 4OA3 |
| Date counted | Jun 30, 2009 (2009Q2) |
| Type: | Finding: Green |
| cornerstone | Initiating Events |
| Identified by: | Self-revealing |
| Inspection Procedure: | IP 71153 |
| Inspectors (proximate) | G Guerra P Elkmann C Graves A Sanchez J Josey J Clark J Mateychick R Kellar J Rotten |
| CCA | P.2, Evaluation |
| INPO aspect | PI.2 |
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Finding - Arkansas Nuclear - IR 05000313/2009003 | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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Finding List (Arkansas Nuclear) @ 2009Q2
Self-Identified List (Arkansas Nuclear)
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