05000482/FIN-2010004-01
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Finding | |
|---|---|
| Title | Failure to Establish Conditions to Open a Main Steam Isolation Value that Resulted in a Feedwater Isolation |
| Description | A self-revealing noncited violation of Technical Specification 5.4.1.a, Procedures, was identified for the failure to provide a procedure to establish appropriate conditions to open a main steam isolation valve in Mode 4 which resulted in an excessive steam generator level swell and feedwater isolation. On March 5, 2010, Wolf Creek commenced a plant heatup following a shutdown to Mode 4 for a nuclear instrument repair. Main steam isolation valve A was opened at approximately 12:07 a.m. and steam generator A level rapidly increased 28 percent and tripped the P-14 setpoint which caused a feedwater isolation. The cause was attributed to an inadequate procedure for determining valve differential pressure or steam demand prior to opening a main steam isolation valve. This issue is captured in Condition Report 23938. For corrective action, Wolf Creek plans to install high accuracy local gauges to measure valve differential pressure. The inspectors determined that the failure to provide a procedure that established the conditions necessary to open a main steam isolation valve without causing an excessive steam generator swell was a performance deficiency. The performance deficiency was determined to be more than minor, and therefore a finding, because it was associated with the Initiating Events Cornerstone attribute of procedure adequacy and affected the cornerstone objective to limit the likelihood of those events that upset plant stability and challenge critical safety functions during shutdown as well as power operation. Using Inspection Manual Chapter 0609.04, Phase 1 Initial Screening and Characterization of Findings, the inspectors concluded the finding screened to Green because the finding did not contribute to both the likelihood of a reactor trip and the likelihood that mitigating equipment or functions would not be available. No crosscutting aspect was identified because there was no aspect that significantly contributed to the event (Section 1R04) |
| Site: | Wolf Creek  |
|---|---|
| Report | IR 05000482/2010004 Section 1R04 |
| Date counted | Sep 30, 2010 (2010Q3) |
| Type: | NCV: Green |
| cornerstone | Initiating Events |
| Identified by: | Self-revealing |
| Inspection Procedure: | IP 71111.04 |
| Inspectors (proximate) | G Guerra D Allen C Long C Peabody T Buchanan |
| INPO aspect | |
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Finding - Wolf Creek - IR 05000482/2010004 | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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Finding List (Wolf Creek) @ 2010Q3
Self-Identified List (Wolf Creek)
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