05000352/FIN-2009003-02
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Finding | |
|---|---|
| Title | Licensee-Identified Violation |
| Description | TS LCO 3.3.7.5, Accident Monitoring Instrumentation, Item 13, requires two channels of Neutron Flux Instruments to be operable in OPCON 1. With less than the required number of operable channels, TS 3.3.7.5 requires restoration of the inoperable channels with 7 days or be in at least Hot Shutdown within the next 12hours. With no operable channels, TS 3.3.7.5 requires restoration of the inoperable channels within 48 hours5.555556e-4 days <br />0.0133 hours <br />7.936508e-5 weeks <br />1.8264e-5 months <br /> or be in at least Hot Shutdown within the next 12 hours1.388889e-4 days <br />0.00333 hours <br />1.984127e-5 weeks <br />4.566e-6 months <br />. Contrary to TS 3.3.7.5, Unit 1 operated in OPCON 1 for periods longer than allowed without the required number of operable Neutron Flux Instruments due to inoperable Source Range Monitors. Specifically, during the periods from October 5, 2006 to December 18, 2006, and December 14, 2006 to April 21, 2007, less than the required number of operable channels of Neutron Flux Instruments were operable. During the periods from January 20, 2006 to February 20, 2006, December 14, 2006to December 18, 2006, and February 20, 2007 to April 21, 2007, no operable channels of Neutron Flux Instruments were operable. The issue was entered into Exelons CAP as IR 867666. The finding was determined to have very low safety significance (Green) using IMC 0609, Appendix M, Significance Determination Process Using Qualitative Criteria, because the SRMs only provide indications to operators following an accident and other instrumentation (i.e., intermediate range monitors and average power range monitors) were available during the time periods in question to ensure the reactor would remain in a safe, shutdown condition. |
| Site: | Limerick  |
|---|---|
| Report | IR 05000352/2009003 Section 4OA7 |
| Date counted | Jun 30, 2009 (2009Q2) |
| Type: | NCV: Green |
| cornerstone | Mitigating Systems |
| Identified by: | Licensee-identified |
| Inspection Procedure: | |
| Inspectors (proximate) | E Dipaolo T Moslak J Lilliendahl T Burns N Sieller P Krohn |
| INPO aspect | |
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Finding - Limerick - IR 05000352/2009003 | ||||||||||||||||||||||||||||||||||||||||||||||||||||||
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Finding List (Limerick) @ 2009Q2
Self-Identified List (Limerick)
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