ENS 43927: Difference between revisions

v t e ENS Event
23:05 Jan 23, 2008
Title	Unusual Event - Toxic Gases in the Turbine Building
Event Description	Detection of toxic gases (CO) inside the turbine building. Source not identified. Initial Readings were greater than 50 parts per million in turbine building lower elevations. EALHU5.1 Detected by safety department random sampling. Turbine building has been evacuated, all personnel have been accounted for with no injures. Follow-up notification will be made with determination of cause of event. The unit is currently defueled. The carbon monoxide source is being investigated. The NRC Resident Inspector as well as state and local authorities were notified. * * UPDATE FROM ERIC PICKRELL TO JOE O'HARA AT 1932 EST ON 1/23/08 * * * Notified J. O'Hara of termination of the declared NOUE. Termination is based on subsequent air monitoring sampling revealing normal Oxygen levels and no detectable Carbon Monoxide levels. (unknown) Source of abnormal sample readings is not yet determined. Believed to be result of Hydrogen Water Chemistry system purge which was in progress at the time of sampling. Licensee terminated the declaration of notification of unusual event at 1827 CST following two subsequently satisfactory air samples. Notified R4DO(Johnson), NRR(Case), and IRD(Blount) * UPDATE FROM TIM SCHENK TO JOHN KNOKE AT 1515 EST ON 01/24/08 * * It has been determined that hazardous levels of toxic gases (Carbon Monoxide) inside the turbine building did not exist at the time of emergency declaration. Actual carbon monoxide levels were less than detectable. Gas sensor cross contamination led to false readings of high carbon monoxide level (60 ppm), when actual gas measurements were reading hydrogen levels of 20 ppm. This level of hydrogen is well below the 40,000 ppm Lower Explosive Limit for hydrogen. The source of the hydrogen readings was attributed to a leaking ventilation rig for the Hydrogen Water Chemistry system during system purge with Nitrogen. The licensee notified the NRC Resident Inspector. Notified R4DO (C. Johnson).

ENS 43927 +/-
Where
River Bend Louisiana (NRC Region 4)
Reporting
Emergency class:	Unusual Event
10 CFR 50.72(a) (1) (i), Emergency Class Declaration
Time - Person (Reporting Time:+-4.57 h-0.19 days <br />-0.0272 weeks <br />-0.00626 months <br />)
Opened:	Thomas Laporte 18:31 Jan 23, 2008
NRC Officer:	Joe O'Hara
Last Updated:	Jan 24, 2008
43927 - NRC Website Loading map... {"minzoom":false,"maxzoom":false,"mappingservice":"leaflet","width":"350px","height":"250px","centre":false,"title":"","label":"","icon":"","lines":[],"polygons":[],"circles":[],"rectangles":[],"copycoords":false,"static":false,"zoom":6,"defzoom":14,"layers":["OpenStreetMap"],"image layers":[],"overlays":[],"resizable":false,"fullscreen":false,"scrollwheelzoom":true,"cluster":false,"clustermaxzoom":20,"clusterzoomonclick":true,"clustermaxradius":80,"clusterspiderfy":true,"geojson":"","clicktarget":"","imageLayers":[],"locations":[{"text":"\u003Cb\u003E\u003Cdiv class=\"mw-parser-output\"\u003E\u003Cp\u003E\u003Ca class=\"mw-selflink selflink\"\u003EENS 43927\u003C/a\u003E - \u003Ca href=\"/River_Bend\" title=\"River Bend\"\u003ERiver Bend\u003C/a\u003E\n\u003C/p\u003E\u003C/div\u003E\u003C/b\u003E\u003Cdiv class=\"mw-parser-output\"\u003E\u003Cp\u003EUnusual Event - Toxic Gases in the Turbine Building\n\u003C/p\u003E\u003C/div\u003E","title":"ENS 43927 - River Bend\n","link":"","lat":30.759530555555557,"lon":-91.3300888888889,"icon":"/w/images/7/79/Entergy_icon.png"}],"imageoverlays":null}
v • d • e

v t e Emergency Notification System
River Bend with 10 CFR 50.72(a)(1)(i), Emergency Class Declaration
WEEKMONTHYEAR2011-02-11T21:07:00 [Table view]
[ENS list for River Bend]

@@ Line 16: / Line 16: @@
 | event date = 01/23/2008 17:05 CST
 | last update date = 01/24/2008
-| title = Unusual Event - Toxic Gases In The Turbine Building
+| title = Unusual Event - Toxic Gases in the Turbine Building
 | event text = Detection of toxic gases (CO) inside the turbine building.
 Source not identified.

v t e Unit 1
GE-6
Reactor critical	Not Critical
Scram	No
Before	Refueling (0 %)
After	Refueling (0 %)

ENS 43927: Difference between revisions

Latest revision as of 21:15, 1 March 2018

Navigation menu

ENS 43927: Difference between revisions

Latest revision as of 21:15, 1 March 2018

Navigation menu

Search