05000250/FIN-2010005-01
From kanterella
Jump to navigation
Jump to search
Finding | |
|---|---|
| Title | Inappropriate procedure guidance results in degradation of boration flow path and loss of charging flow |
| Description | The inspectors identified a Non-cited violation (NCV) of Technical Specification 6.8.1, Procedures, when plant alarm response and off-normal procedures were not adequate to prevent lifting of a charging relief valve. As a result, during operations to assure adequate seal injection flow, a charging throttle valve was shut causing lifting of a charging system relief, diversion of charging flow, and degradation of the boration flow path. When identified to the licensee by the inspectors during review of charging system anomalies, the licensee documented the occurrence in the corrective action program as CR 595200 and upgraded procedures. Although the event occurred on Unit 3, similar procedures existed on Unit 4. While attempting to regulate RCP seal injection flow, operators shut charging throttle valve HCV-3-121. This was a performance deficiency, in that it caused lifting of the charging relief valve(s), diversion of charging flow, and subsequent failure of a charging relief valve. The relief valve failure reduced the reliability of charging flow to the loops and affected the ability of the charging system to perform its design functions including providing for reactivity control, maintaining the proper water inventory in the reactor coolant system, and providing RCP seal injection flow. The issue was more than minor. The finding was screened as Green using NRC Inspection Manual Chapter 0609, Attachment 0609.04, SDP Phase 1 screening because the finding did not result in any loss of function, with some level of charging or seal flow remaining throughout the event. All screening questions were answered No. The Mitigating Systems cornerstone was affected when charging capability and the boration flow path was degraded by diversion of flow through the relief valve back to the charging pump suction. The finding affected the cross-cutting aspect of Human Performance, Resources, when operating procedures did not adequately provide accurate guidance to prevent mis-operation (shutting) of the charging throttle valve. |
| Site: | Turkey Point  |
|---|---|
| Report | IR 05000250/2010005 Section 1R04 |
| Date counted | Dec 31, 2010 (2010Q4) |
| Type: | NCV: Green |
| cornerstone | Mitigating Systems |
| Identified by: | NRC identified |
| Inspection Procedure: | IP 71111.04 |
| Inspectors (proximate) | G Kuzo R Aiello R Carrion M Barillas S Stewart D Rich A Vargas A Sengupta R Kellner |
| CCA | H.7, Documentation |
| INPO aspect | WP.3 |
| ' | |
Finding - Turkey Point - IR 05000250/2010005 | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
Finding List (Turkey Point) @ 2010Q4
Self-Identified List (Turkey Point)
| ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||