05000482/FIN-2009302-01
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Finding | |
|---|---|
| Title | Inadequately Analyzed Emergency Operating Procedure Change |
| Description | The NRC examiners identified a Green noncited violation of Technical Specification 5.4.1.b for failure to validate changes made to Emergency Operating Procedures. Specifically, the licensee failed to validate a change made to Emergency Operating Procedure E-0, Reactor Trip or Safety Injection. This unvalidated change to E-0 had the unintended consequence of changing the Emergency Operating Procedure mitigation strategy in the steam generator tube rupture procedure, E-3, in that it resulted in premature direction to close the main steam isolation valves which increases the likelihood and duration of a radioactive release during a tube rupture event. This was an undesirable effect that the licensee had not considered when it made the change to E-0. This was entered into the licensees Corrective Action Program under AR22391, and the licensee removed the change that was made to E-0. The finding was more than minor because it adversely affected the barrier integrity cornerstone attribute of Procedure Quality in that the change to the emergency operating procedure increased the likelihood of an offsite release during a steam generator tube rupture casualty. Manual Chapter 0609, Attachment 4, Initial Screening and Characterization of Findings, was used to evaluate the finding. The finding is of very low safety significance because it did not represent a degradation of the radiological barrier function provided for the control room, auxiliary building, or spent fuel pool; it did not represent a degradation of the barrier function of the control room against smoke or a toxic atmosphere; it did not represent an actual open pathway in the physical integrity of reactor containment; and it did not involve an actual reduction in function of hydrogen ignitors in the reactor containment. The finding had a crosscutting aspect in the area of human performance associated with decision making because the licensee failed to conduct effectiveness reviews of safety-significant decisions to verify the validity of underlying assumptions and identify possible unintended consequences H.1(b) |
| Site: | Wolf Creek  |
|---|---|
| Report | IR 05000482/2009302 Section 4OA2 |
| Date counted | Dec 31, 2009 (2009Q4) |
| Type: | NCV: Green |
| cornerstone | Barrier Integrity |
| Identified by: | NRC identified |
| Inspection Procedure: | IP 71152 |
| Inspectors (proximate) | G Apger S Hedger |
| CCA | H.14, Conservative Bias |
| INPO aspect | DM.2 |
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Finding - Wolf Creek - IR 05000482/2009302 | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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Finding List (Wolf Creek) @ 2009Q4
Self-Identified List (Wolf Creek)
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