ENS Event | |
|---|---|
23:30 Oct 19, 2007 | |
| Title | Tech Spec Required Shutdown Due to Ultimate Heat Sink Inoperability |
| Event Description | lnitiated Unit 1 and Unit 2 plant shutdown due to inoperability of ultimate heat sink system. The inoperability is due to structural integrity failure of ASME Class 3 piping through wall leakage of the 0C Essential Service Water riser piping of the mechanical draft cooling tower.
Licensee is in Technical Specification 3.7.9 which requires the units be in Mode 3 in 6 hours6.944444e-5 days <br />0.00167 hours <br />9.920635e-6 weeks <br />2.283e-6 months <br /> and Mode 5 in 36 hours4.166667e-4 days <br />0.01 hours <br />5.952381e-5 weeks <br />1.3698e-5 months <br />. The licensee has notified the NRC Resident Inspector. |
| Where | |
|---|---|
Byron  Illinois (NRC Region 3) | |
| Reporting | |
| 10 CFR 50.72(b)(2)(i), Tech Spec Required Shutdown | |
| Time - Person (Reporting Time:+-3.58 h-0.149 days <br />-0.0213 weeks <br />-0.0049 months <br />) | |
| Opened: | Darrell Johnson` 19:55 Oct 19, 2007 |
| NRC Officer: | Jeff Rotton |
| Last Updated: | Oct 19, 2007 |
| 43735 - NRC Website
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Unit 1 | |
|---|---|
| Reactor critical | Critical |
| Scram | No |
| Before | Power Operation (100 %) |
| After | Power Operation (75 %) |
Unit 2 | |
|---|---|
| Reactor critical | Critical |
| Scram | No |
| Before | Power Operation (100 %) |
| After | Power Operation (75 %) |
WEEKMONTHYEARENS 476242012-01-30T16:01:00030 January 2012 16:01:00
[Table view]10 CFR 50.72(b)(2)(iv)(B), RPS System Actuation, 10 CFR 50.72(a)(1)(i), Emergency Class Declaration, 10 CFR 50.72(b)(3)(iv)(A), System Actuation, 10 CFR 50.72(b)(2)(i), Tech Spec Required Shutdown Unusual Event Due to Loss of Offsite Power Greater than 15 Minutes ENS 437352007-10-19T23:30:00019 October 2007 23:30:00 10 CFR 50.72(b)(2)(i), Tech Spec Required Shutdown Tech Spec Required Shutdown Due to Ultimate Heat Sink Inoperability 2012-01-30T16:01:00 | |