ENS 45969: Difference between revisions
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| event date = 06/01/2010 15:50 EDT | | event date = 06/01/2010 15:50 EDT | ||
| last update date = 06/02/2010 | | last update date = 06/02/2010 | ||
| title = Potential Loss | | title = Potential Loss of Radiation Release Controls | ||
| event text = On May 27, 2010, during a control board walkdown, it was discovered that two sets of auxiliary building tunnel exhaust dampers were open at the same time. This configuration created a pathway from the secondary containment to the outside. The condition was immediately corrected. Additional investigation determined that this condition existed since May 11, 2010, when Millstone 3 was in Mode 5. | | event text = On May 27, 2010, during a control board walkdown, it was discovered that two sets of auxiliary building tunnel exhaust dampers were open at the same time. This configuration created a pathway from the secondary containment to the outside. The condition was immediately corrected. Additional investigation determined that this condition existed since May 11, 2010, when Millstone 3 was in Mode 5. | ||
Technical Specification 3.6.6.2 'Secondary Containment' is applicable in Modes 1, 2, 3, and 4. The condition discovered on May 27, 2010, rendered Secondary Containment inoperable. Further evaluation since the discovery date concludes that the secondary containment structure was in a condition which could prevent the fulfillment of the safety function for controlling the release of radioactive material. [On June 1, at 1550 EDT the licensee determined that the event was potentially reportable]. | Technical Specification 3.6.6.2 'Secondary Containment' is applicable in Modes 1, 2, 3, and 4. The condition discovered on May 27, 2010, rendered Secondary Containment inoperable. Further evaluation since the discovery date concludes that the secondary containment structure was in a condition which could prevent the fulfillment of the safety function for controlling the release of radioactive material. [On June 1, at 1550 EDT the licensee determined that the event was potentially reportable]. | ||
Latest revision as of 22:09, 1 March 2018
| Where | |
|---|---|
Millstone  Connecticut (NRC Region 1) | |
| Reporting | |
| 10 CFR 50.72(b)(3)(v)(C), Loss of Safety Function - Release of Radioactive Material | |
| Time - Person (Reporting Time:+-2.88 h-0.12 days <br />-0.0171 weeks <br />-0.00395 months <br />) | |
| Opened: | Norman Kuzel 16:57 Jun 1, 2010 |
| NRC Officer: | Vince Klco |
| Last Updated: | Jun 2, 2010 |
| 45969 - NRC Website
| |
| Secondary Containment Inoperable [Table view] | ||