ENS 46857: Difference between revisions
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| event date = 05/17/2011 10:30 CDT | | event date = 05/17/2011 10:30 CDT | ||
| last update date = 05/17/2011 | | last update date = 05/17/2011 | ||
| title = Temporary Blockage | | title = Temporary Blockage of Suction Source for Containment Cooling Service Water | ||
| event text = On 5/17/2011, at 1404 CDT, Dresden Operations was notified by a Mechanical Maintenance Supervisor that both intake bay 13 stop logs were mistakenly installed during routine bay cleaning on 5/17/2011 at 1030. Installation of both bay 13 stop logs removes the suction source for the Containment Cooling Service Water (CCSW) system and renders the CCSW systems inoperable for both Dresden Units 2 and 3. Appropriate Technical Specification Required Actions were entered which direct restoration of at least one train of CCSW within 8 hours on each unit. Mechanical Maintenance was directed to remove the stop logs from Bay 13. At 1410 stop logs were removed and CCSW was declared operable for both Unit 2 and Unit 3. This event is reportable under 10 CFR 50.72 (b) (3) (v) an "Event or Condition That Could Have Prevented Fulfillment of a Safety Function. | | event text = On 5/17/2011, at 1404 CDT, Dresden Operations was notified by a Mechanical Maintenance Supervisor that both intake bay 13 stop logs were mistakenly installed during routine bay cleaning on 5/17/2011 at 1030. Installation of both bay 13 stop logs removes the suction source for the Containment Cooling Service Water (CCSW) system and renders the CCSW systems inoperable for both Dresden Units 2 and 3. Appropriate Technical Specification Required Actions were entered which direct restoration of at least one train of CCSW within 8 hours on each unit. Mechanical Maintenance was directed to remove the stop logs from Bay 13. At 1410 stop logs were removed and CCSW was declared operable for both Unit 2 and Unit 3. This event is reportable under 10 CFR 50.72 (b) (3) (v) an "Event or Condition That Could Have Prevented Fulfillment of a Safety Function. | ||
The licensee notified the NRC Resident Inspector. | The licensee notified the NRC Resident Inspector. | ||
Latest revision as of 21:07, 1 March 2018
| Where | |
|---|---|
Dresden  Illinois (NRC Region 3) | |
| Reporting | |
| 10 CFR 50.72(b)(3)(v)(B), Loss of Safety Function - Remove Residual Heat | |
| Time - Person (Reporting Time:+3.17 h0.132 days <br />0.0189 weeks <br />0.00434 months <br />) | |
| Opened: | Thomas Ditchfield 18:40 May 17, 2011 |
| NRC Officer: | Pete Snyder |
| Last Updated: | May 17, 2011 |
| 46857 - NRC Website
| |