ENS Event | |
|---|---|
11:53 Aug 16, 2003 | |
| Title | Unit 2 Commenced a Shutdown After Entering Tech Spec 3.0.3 |
| Event Description | Both channels 1 and 3 of the FWST (Refueling Water Storage Tank) level instrumentation failed high due to an apparent lightning strike. This placed Unit 2 in Tech Spec 3.0.3 requiring Unit 2 to be in Mode 3 within 7 hours8.101852e-5 days <br />0.00194 hours <br />1.157407e-5 weeks <br />2.6635e-6 months <br />, Mode 4 within 13 hours1.50463e-4 days <br />0.00361 hours <br />2.149471e-5 weeks <br />4.9465e-6 months <br />, and Mode 5 within 37 hours4.282407e-4 days <br />0.0103 hours <br />6.117725e-5 weeks <br />1.40785e-5 months <br />.
The licensee will inform the NRC resident inspector.
The licensee had its NOED approved to continue operation for up to 48 hours5.555556e-4 days <br />0.0133 hours <br />7.936508e-5 weeks <br />1.8264e-5 months <br /> to repair the level channels. At 1115 the licensee halted power reduction @ 82%. They are now repairing both channels 1&3 and they should be completed within the next 3 hrs. The NRC Resident Inspector was notified. Notified Reg2 RDO (Ayres)
The licensee has completed repair of channel 1 of the level instrumentation and returned it to service @ 1357, so as of this time they have exited the action statement. Channel 3 should be returned to service within one hour. The NRC resident Inspector was informed. Notified Reg 2 RDO (Ayres) |
| Where | |
|---|---|
Catawba  South Carolina (NRC Region 2) | |
| Reporting | |
| 10 CFR 50.72(b)(2)(i), Tech Spec Required Shutdown | |
| Time - Person (Reporting Time:+2.48 h0.103 days <br />0.0148 weeks <br />0.0034 months <br />) | |
| Opened: | Tom Poetzsch 14:22 Aug 16, 2003 |
| NRC Officer: | Steve Sandin |
| Last Updated: | Aug 16, 2003 |
| 40081 - NRC Website
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Unit 2 | |
|---|---|
| Reactor critical | Critical |
| Scram | No |
| Before | Power Operation (100 %) |
| After | Power Operation (95 %) |
WEEKMONTHYEARENS 575172025-01-28T13:32:00028 January 2025 13:32:00
[Table view]10 CFR 50.72(b)(2)(i), Tech Spec Required Shutdown Technical Specification Required Shutdown ENS 475252011-12-15T12:39:00015 December 2011 12:39:00 10 CFR 50.72(b)(2)(i), Tech Spec Required Shutdown Dual Unit Technical Specification 3.0.3 Required Shutdown Due to Loss of Control Room Chillers ENS 400812003-08-16T11:53:00016 August 2003 11:53:00 10 CFR 50.72(b)(2)(i), Tech Spec Required Shutdown Unit 2 Commenced a Shutdown After Entering Tech Spec 3.0.3 2025-01-28T13:32:00 | |