05000352/FIN-2009004-03
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Finding | |
|---|---|
| Title | Licensee-Identified Violation |
| Description | TS LCO 3.7.8, Main Turbine Bypass System, requires the main turbine bypass system to be operable when in Operational Condition 1, when thermal power is greater than or equal to 25 percent of rated thermal power. With the main turbine bypass system inoperable, TS 3.7.8 requires restoration of the system to an operable status within 1 hour1.157407e-5 days <br />2.777778e-4 hours <br />1.653439e-6 weeks <br />3.805e-7 months <br /> or take the action required by TS 3.2.3.c. TS 3.2.3.c requires that Minimum Critical Power Ratio (MCPR) be determined to be greater than or equal to the rated MCPR limit specified in the Core Operating Limits Report Main Turbine Bypass Valve Inoperable Curve. Contrary to TS 3.7.8, Unit 2 operated in Operational Condition 1 with thermal power greater than 25 percent with the main turbine bypass system inoperable for greater than 1 hour1.157407e-5 days <br />2.777778e-4 hours <br />1.653439e-6 weeks <br />3.805e-7 months <br /> and the action required by TS 3.2.3.c was not performed. Specifically, during troubleshooting and surveillance test activities on February 15, 2008, May 24, 2008, September 13, 2008, and December 14, 2008, the main turbine bypass system was rendered inoperable for greater than one hour and the MCPR was not determined to be greater than or equal to the rated MCPR limit specified in the Core Operating Limits Report. The issue was entered into Exelons CAP as IR 917231. The finding was determined to have very low safety significance (Green) using NRC IMC 0609, Attachment 4, Phase 1 Initial Screening and Characterization of Findings, Fuel Barrier, because operation with MCPR less than the rated MCPR limit specified in the Core Operating Limits Report could potentially only affect the fuel barrier and the condition did not represent a loss of the pressure mitigating function of the main turbine bypass system or affect the spent fuel pool |
| Site: | Limerick  |
|---|---|
| Report | IR 05000352/2009004 Section 4OA7 |
| Date counted | Sep 30, 2009 (2009Q3) |
| Type: | NCV: Green |
| cornerstone | Initiating Events |
| Identified by: | Licensee-identified |
| Inspection Procedure: | |
| Inspectors (proximate) | E Dipaolo T Moslak J Lilliendahl J Kulp N Sieller P Krohn E Torres N Lafferty |
| INPO aspect | |
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Finding - Limerick - IR 05000352/2009004 | |||||||||||||||||||||||||||||||||||||||||||||||||||||
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Finding List (Limerick) @ 2009Q3
Self-Identified List (Limerick)
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