ENS 47348
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ENS Event | |
|---|---|
00:50 Oct 18, 2011 | |
| Title | Unit 1 Declared an Unusual Event Based on Ammonia Levels Exceeding Osha Limits |
| Event Description | Normal Operation of WBN [Watts Bar Nuclear] Unit 1 impeded in the Turbine Building, El. 685, West side of the Unit 1 Main condenser due to Toxic Gas (ammonia) concentrations of 75-79 ppm exceeding the OSHA Permissible Exposure Limit (PEL) of 50 ppm, and the ACGIH [American Conference of Governmental Industrial Hygienists] limit of 25 ppm. WBN Unit 1 returned to approximately 100% RTP on Monday, October 17, 2011, following a maintenance outage. Suspect excessive ammonia concentrations due to condenser vacuum pump continuous drains which may need throttling open to increase drain flow, following Unit startup. (Ammonia is used to treat feedwater for secondary chemistry control). There have been no injuries from this event. NRC Senior Resident [Inspector] has been notified. (Event Class 4.4.A, Toxic Gas, Unusual Event).
The licensee informed both the State and local agencies. Notified FEMA (Blankenship) and DHS (Konopka).
At 0047 EDT on 10/18/2011, the licensee terminated the Notification of Unusual Event condition based on ammonia concentrations having been reduced to approximately 6 ppm. Normal personnel access to the affected area has been restored. Unit 1 remained at 100% power during this event with no changes or challenges to plant operations. During the event there were no additional EAL designators. During the event there were no significant changes in plant conditions. During the event there were no significant changes in plant radiological conditions. During the event there were no offsite protective recommendations made by the licensee. The licensee notified the NRC Resident Inspector and State and local agencies. Notified R2DO (Lesser), NRR EO (Brown), IRD (Morris), DHS (Gates), and FEMA (Blankenship).
This information is being provided to the NRC for a 10CFR50.72(b)(2)(xi) notification. TVA is planning on making a news release to local media affiliates and posting the news release on TVA's website. This news release is in reference to the Notification of Unusual Event (NOUE) Watts Bar Nuclear Plant recently entered and exited for ammonia levels exceeding OSHA limits (reference EN 47348 and update). The licensee notified the NRC Senior Resident Inspector." Notified R2DO (Lesser). |
| Where | |
|---|---|
Watts Bar  Tennessee (NRC Region 2) | |
| Reporting | |
| Emergency class: | Unusual Event |
| 10 CFR 50.72(a) (1) (i), Emergency Class Declaration 10 CFR 50.72(b)(2)(xi), Notification to Government Agency or News Release | |
| Time - Person (Reporting Time:+-3.28 h-0.137 days <br />-0.0195 weeks <br />-0.00449 months <br />) | |
| Opened: | Bill Sprinkle 21:33 Oct 17, 2011 |
| NRC Officer: | Steve Sandin |
| Last Updated: | Oct 18, 2011 |
| 47348 - NRC Website | |
Unit 1 | |
|---|---|
| Reactor critical | Critical |
| Scram | No |
| Before | Power Operation (100 %) |
| After | Power Operation (100 %) |
Watts Bar with 10 CFR 50.72(b)(2)(xi), Notification to Government Agency or News Release, 10 CFR 50.72(a)(1)(i), Emergency Class Declaration | |
WEEKMONTHYEARENS 568502023-11-12T08:00:00012 November 2023 08:00:00
[Table view]10 CFR 50.72(b)(2)(xi), Notification to Government Agency or News Release Offsite Notification ENS 568092023-10-21T13:07:00021 October 2023 13:07:00 10 CFR 50.72(a)(1)(i), Emergency Class Declaration Notification of Unusual Event Declared ENS 555902021-11-18T04:10:00018 November 2021 04:10:00 10 CFR 50.72(b)(2)(xi), Notification to Government Agency or News Release Non-Work Related On-Site Fatality ENS 555502021-10-28T17:40:00028 October 2021 17:40:00 10 CFR 50.72(b)(2)(xi), Notification to Government Agency or News Release Offsite Notification Due to Two Monitoring Wells Exceeding NEI GPI Tritium Threshold Values ENS 547532020-06-22T17:04:00022 June 2020 17:04:00 10 CFR 50.72(b)(2)(xi), Notification to Government Agency or News Release Offsite Notification - Groundwater Initiative ENS 545312020-02-19T14:57:00019 February 2020 14:57:00 10 CFR 50.72(a)(1)(i), Emergency Class Declaration ENS 524002016-11-29T12:32:00029 November 2016 12:32:00 10 CFR 50.72(b)(2)(xi), Notification to Government Agency or News Release Offsite Notification Due to Chemical Spill Onsite ENS 522102016-08-31T01:20:00031 August 2016 01:20:00 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 Notice of Unusual Event - Fire in a Main Bank Transformer ENS 521632016-08-09T18:15:0009 August 2016 18:15:00 10 CFR 50.72(b)(2)(xi), Notification to Government Agency or News Release Offsite Notification Due to Oil Sheen in Cooling Tower Basin ENS 521262016-07-26T19:36:00026 July 2016 19:36:00 10 CFR 50.72(b)(2)(xi), Notification to Government Agency or News Release Offsite Notification Due to Oil Sheen in Cooling Tower Basin ENS 520212016-06-18T15:06:00018 June 2016 15:06:00 10 CFR 50.72(b)(2)(xi), Notification to Government Agency or News Release Offsite Notifications to Uscg National Response Center and Tema ENS 518852016-04-27T02:13:00027 April 2016 02:13:00 10 CFR 50.72(b)(2)(xi), Notification to Government Agency or News Release, 10 CFR 50.72(b)(3)(xiii), Loss of Emergency Preparedness Alert and Notification System Feedback System Inoperable ENS 517802016-03-09T08:42:0009 March 2016 08:42:00 10 CFR 50.72(a)(1)(i), Emergency Class Declaration Unusual Event Declared Due to a Fire Greater than 15 Minutes ENS 505802014-10-30T15:00:00030 October 2014 15:00:00 10 CFR 50.72(b)(2)(xi), Notification to Government Agency or News Release Offsite Notification and Press Release Regarding Boone Dam Stability Issues ENS 499502014-03-24T16:55:00024 March 2014 16:55:00 10 CFR 50.72(b)(2)(xi), Notification to Government Agency or News Release Offsite Notification Due to Death of Employee ENS 497362014-01-17T16:43:00017 January 2014 16:43:00 10 CFR 50.72(b)(2)(xi), Notification to Government Agency or News Release Offsite Notification Due to Onsite Death of an Employee ENS 496502013-12-18T14:32:00018 December 2013 14:32:00 10 CFR 50.72(b)(2)(xi), Notification to Government Agency or News Release Offsite Notification Due to Contract Employee Collapsing within the Protected Area ENS 489502013-04-21T06:11:00021 April 2013 06:11:00 10 CFR 50.72(b)(2)(xi), Notification to Government Agency or News Release, 10 CFR 50.72(a)(1)(i), Emergency Class Declaration Notification of Unusual Event Due to Shots Fired within the Owner Controlled Area ENS 481752012-08-10T12:48:00010 August 2012 12:48:00 10 CFR 50.72(a)(1)(i), Emergency Class Declaration Unusual Event Declared Due to Toxic Gas Release ENS 480752012-07-06T14:12:0006 July 2012 14:12:00 10 CFR 50.72(b)(2)(xi), Notification to Government Agency or News Release Loss of 7 Offsite Sirens Due to Inclement Weather ENS 473482011-10-18T00:50:00018 October 2011 00:50:00 10 CFR 50.72(b)(2)(xi), Notification to Government Agency or News Release, 10 CFR 50.72(a)(1)(i), Emergency Class Declaration Unit 1 Declared an Unusual Event Based on Ammonia Levels Exceeding Osha Limits ENS 470212011-07-04T17:36:0004 July 2011 17:36:00 10 CFR 50.72(b)(2)(xi), Notification to Government Agency or News Release Offsite Notification Due to Spurious Siren Activation ENS 469672011-06-16T17:09:00016 June 2011 17:09:00 10 CFR 50.72(b)(2)(xi), Notification to Government Agency or News Release Chemical Release from Intake Pumping Station. ENS 464692010-12-06T13:15:0006 December 2010 13:15:00 10 CFR 50.72(b)(2)(xi), Notification to Government Agency or News Release Offsite Notification - Osha Contacted Due to Fatality of Contractor Employee ENS 464482010-12-02T21:10:0002 December 2010 21:10:00 10 CFR 50.72(b)(2)(xi), Notification to Government Agency or News Release Offsite Notification Due to an Individual Contamination ENS 430022006-11-21T11:15:00021 November 2006 11:15:00 10 CFR 50.72(b)(2)(xi), Notification to Government Agency or News Release, 10 CFR 50.72(a)(1)(i), Emergency Class Declaration Unusual Event Declared Due to Unidentified Leakage ENS 414002005-02-10T22:01:00010 February 2005 22:01:00 10 CFR 50.72(b)(2)(xi), Notification to Government Agency or News Release Offsite Notification Due to Tritium Sample Exceeding Offsite Dose Calculation Manual (Odcm) Reporting Level ENS 410492004-09-17T09:00:00017 September 2004 09:00:00 10 CFR 50.72(b)(2)(xi), Notification to Government Agency or News Release, 10 CFR 50.72(b)(3)(xiii), Loss of Emergency Preparedness Loss of Emergency Siren Capability and Notification of Offsite Agency 2023-11-12T08:00:00 | |
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