ENS 47569
ENS Event | |
|---|---|
09:53 Jan 5, 2012 | |
| Title | Sodium Hypochlorite Leak Resulted in Airborne Concentrations Potentially Dangerous to Life and Health |
| Event Description | A section of piping between sodium hypochlorite tanks[tanks 121 and 122] broke and resulted in a unisolable leak in one of the tanks. The spill was contained within the berm of the chlorine house.
The spill resulted in airborne concentrations exceeding Immediately Dangerous to Life and Health (IDLH) conditions in the chlorine house, which is contiguous to the plant screen house. Alert declared based upon HA3.1 - Report or detection of toxic gases within or contiguous to Table H-1 areas in concentrations that may result in an atmosphere Immediately Dangerous to Life and Health (IDLH). The licensee will remain in the Alert until IDLH conditions have been terminated. An offsite HAZMAT team has been notified and is expected to be on-site today at 0630 CST to clean up the spill. The licensee will notify the Resident Inspectors.
The licensee reports that the HAZMAT contractor has arrived on-site. Licensee personnel are preparing a clearance for the sodium hypochlorite system in order to support HAZMAT contractor work. The licensee will notify the NRC Resident Inspector. Notified the R3DO (Valos)
The Alert declaration due to HA3.1, Report or detection of toxic gases within or contiguous to Table H-1 areas in concentrations that may result in an atmosphere Immediately Dangerous to Life and Health (IDHL): Prairie Island terminated from the Alert declaration at 1408 CST on Jan 5, 2012. The following additional conditions were established prior to termination: 1. The permanent berm containing the sodium hypochlorite released by 121 Sodium Hypochlorite Tank piping break was pumped down. 2. Clean-up and remediation of the affected area is in progress. 3. Inspection of the unaffected sodium hypochlorite tank piping has been conducted to ensure satisfactory integrity. NRC Resident has been informed. Notified NRR EO (Ruland), R3DO (Valos), IRD (Morris), DHS (Beach), FEMA (Blankenship), DOE (Jackson), USDA (Timmons), and HHS (Fajardo). |
| Where | |
|---|---|
Prairie Island  Minnesota (NRC Region 3) | |
| Reporting | |
| Emergency class: | Alert |
| 10 CFR 50.72(a) (1) (i), Emergency Class Declaration | |
| Time - Person (Reporting Time:+-4.58 h-0.191 days <br />-0.0273 weeks <br />-0.00627 months <br />) | |
| Opened: | Mark Loosbrock 05:18 Jan 5, 2012 |
| NRC Officer: | Vince Klco |
| Last Updated: | Jan 5, 2012 |
| 47569 - NRC Website
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Unit 1 | |
|---|---|
| Reactor critical | Critical |
| Scram | No |
| Before | Power Operation (100 %) |
| After | Power Operation (100 %) |
Unit 2 | |
|---|---|
| Reactor critical | Critical |
| Scram | No |
| Before | Power Operation (100 %) |
| After | Power Operation (100 %) |
WEEKMONTHYEARENS 565432023-05-27T23:34:00027 May 2023 23:34:00
[Table view]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 Notification of Unusual Event Due to Multiple Fire Alarms in Containment Not Verified within 15 Minutes ENS 521782016-08-14T04:59:00014 August 2016 04:59:00 10 CFR 50.72(a)(1)(i), Emergency Class Declaration Unusual Event Declared Due to Excessive Reactor Coolant System Leakage ENS 516092015-12-17T19:18:00017 December 2015 19:18:00 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 Unusual Event Declared Due to Fire Alarm in Containment Not Verified within 15 Minutes ENS 508662015-03-05T10:06:0005 March 2015 10:06:00 10 CFR 50.72(a)(1)(i), Emergency Class Declaration Unit 2 Declares Unusual Event Due to Inability to Validate a Containment Fire Alarm within 15 Minutes ENS 484642012-10-31T19:18:00031 October 2012 19:18:00 10 CFR 50.72(a)(1)(i), Emergency Class Declaration Notice of Unusual Event Due to Security Condition ENS 477202012-03-06T12:24:0006 March 2012 12:24:00 10 CFR 50.72(a)(1)(i), Emergency Class Declaration Notification of Unusual Event Due to Unidentified Rcs Leakage Greater than 10 Gpm ENS 475692012-01-05T09:53:0005 January 2012 09:53:00 10 CFR 50.72(a)(1)(i), Emergency Class Declaration Sodium Hypochlorite Leak Resulted in Airborne Concentrations Potentially Dangerous to Life and Health ENS 443802008-08-03T08:52:0003 August 2008 08:52:00 10 CFR 50.72(a)(1)(i), Emergency Class Declaration Unusual Event - Hydrazine Leak in Non-Vital Area of the Turbine Building 2023-05-27T23:34:00 | |