ENS 41207
ENS Event | |
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22:30 Nov 18, 2004 | |
Title | Both Trains of Radiation Monitoring Automatic Isolation Features Disabled During Refueling Operations |
Event Description | The following information was obtained from the licensee via facsimile:
At 1630 [hrs CST] the control room was performing head lift and pre-rod drive unlatching checkout and discovered R-12 (Containment Radiation Monitor) would not isolate reactor ventilation isolation. Investigation found that work on Engineered Safeguards Features pre-startup logic test had defeated both Train A and B automatic isolation signals to [Reactor Building Ventilation]. This test was started and signals defeated at 0803 [hrs.] and 0804 [hrs.]. Refueling evolutions, upper internals lift and rod latching were performed. Technical Specifications require auto-isolation capability for [Reactor Building Ventilation] during refueling ops. Both R-12 and R-21 would respond to high radiation and manual isolation of Reactor Building Ventilation was still available. Currently, refueling operations are stopped until auto-isolation of Reactor Building Ventilation is restored. The licensee has determined that no increased gaseous or particulate radiation levels existed while the auto-isolation features were defeated. The licensee has notified the NRC Resident Inspector. |
Where | |
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Kewaunee ![]() Wisconsin (NRC Region 3) | |
Reporting | |
10 CFR 50.72(b)(3)(v)(C), Loss of Safety Function - Release of Radioactive Material | |
Time - Person (Reporting Time:+-3.52 h-0.147 days <br />-0.021 weeks <br />-0.00482 months <br />) | |
Opened: | Dave Karst 18:59 Nov 18, 2004 |
NRC Officer: | Howie Crouch |
Last Updated: | Nov 18, 2004 |
41207 - NRC Website
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