ENS 47054
ENS Event | |
|---|---|
15:16 Jul 15, 2011 | |
| Title | Alert Declared Due to Toxic Gas Release Restricting Access to a Vital Area |
| Event Description | An alert was declared due to a leak of sodium hypochlorite at the unit 2/3 cribhouse. Access to the unit 2/3 cribhouse, which is a vital area, was restricted. The leak has been isolated.
The licensee has notified State authorities and the NRC Resident Inspector. The licensee stated that the sodium hypochlorite leak was actually outside the cribhouse and went into a sump. The fumes from the sodium hypochlorite restricted access to the cribhouse which contains safety related ultimate heat sink equipment (containment cooling service water pumps, emergency diesel generator cooling water pumps). Other than restricting access to the cribhouse, the leak has had no other impact on plant operation. The alert was declared under EAL H.A.7 - release of toxic gas within or restricting access to a vital area.
The alert has been terminated on 7/15/11 at 1520 CDT. The conditions which caused the alert no longer exist. A press release was made for the event. Two employees were sent for offsite medical attention as a precautionary measure; neither employee was contaminated. The licensee stated that the sodium hypochlorite had leaked from a pipe into a sump under the storage trailer near the cribhouse. The sodium hypochlorite that leaked into the sump has been pumped out. Access to the cribhouse has been restored and there are no other access restrictions at the site. Both units continue to operate at full power. The licensee will notify appropriate state and local authorities. The NRC Resident Inspector has been notified. The licensee has also issued press releases concerning this event. R3DO (Bloomer), NRR EO (Giitter), IRD (Morris), DHS(Knox), and FEMA (Burckhart) have been notified. |
| Where | |
|---|---|
Dresden  Illinois (NRC Region 3) | |
| Reporting | |
| Emergency class: | Alert |
| 10 CFR 50.72(a) (1) (i), Emergency Class Declaration | |
| Time - Person (Reporting Time:+-3.37 h-0.14 days <br />-0.0201 weeks <br />-0.00462 months <br />) | |
| Opened: | Paul Wojtkiewicz 11:54 Jul 15, 2011 |
| NRC Officer: | Bill Huffman |
| Last Updated: | Jul 15, 2011 |
| 47054 - NRC Website
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Unit 2 | |
|---|---|
| Reactor critical | Critical |
| Scram | No |
| Before | Power Operation (100 %) |
| After | Power Operation (100 %) |
Unit 3 | |
|---|---|
| Reactor critical | Critical |
| Scram | No |
| Before | Power Operation (100 %) |
| After | Power Operation (100 %) |
WEEKMONTHYEARENS 555272021-10-16T10:28:00016 October 2021 10:28:00
[Table view]10 CFR 50.72(a)(1)(i), Emergency Class Declaration Unusual Event Declared Due to a Fire in the Protected Area ENS 520462016-06-27T15:50:00027 June 2016 15:50:00 10 CFR 50.72(b)(3)(v)(D), Loss of Safety Function - Mitigate the Consequences of an Accident, 10 CFR 50.72(a)(1)(i), Emergency Class Declaration Dresden Unit 3 Declares Alert ENS 470542011-07-15T15:16:00015 July 2011 15:16:00 10 CFR 50.72(a)(1)(i), Emergency Class Declaration Alert Declared Due to Toxic Gas Release Restricting Access to a Vital Area ENS 408442004-06-28T06:15:00028 June 2004 06:15:00 10 CFR 50.72(a)(1)(i), Emergency Class Declaration Unusual Event Declared Due to Earthquake Felt at the Site ENS 407272004-05-05T18:27:0005 May 2004 18:27:00 10 CFR 50.72(a)(1)(i), Emergency Class Declaration Unusual Event Due to Loss of Offsite Power 2021-10-16T10:28:00 | |