Breaking: Fire at Turbine Building at Watts Bar Nuke Plant – Tenn. + Fishy Incident Reporting

10 03 2016

ENE- NewsEMERGENCY: Fire breaks out at another US nuclear plant — Blaze ignites in turbine building — “It took so long to put out” — Alert issued to government officials (VIDEO)

EMERGENCY DECLARED… UNUSUAL EVENT DECLARED DUE TO A FIRE GREATER THAN 15 MINUTES… Watts Bar Unit 2 declared an Unusual Event at 0342 EST based on a fire greater than 15 minutes in the turbine building

Fire in Watts Bar pump motor on Wednesday declared an emergency

Fire Triggers Emergency Event at Tennessee Nuclear PlantA small fire occurred in a pump motor during a test of the TVA’s newest reactor


 

Yesterday, Wed., they reported a strange occurrence. . . 2 months AFTER it happened. Did they bother with the report AFTER the fire???

NRC Event Number: 51784

Event Date: 01/10/2016   ◊ Notification Date: 03/09/2016  ◊  Notification Time: 16:53 [ET]

 

INVALID ACTUATION OF THE PRIMARY CONTAINMENT ISOLATION LOGIC

"On January 10, 2016, at 0243 CST, with the plant in cold shutdown, the primary containment isolation logic was actuated as the result of an invalid signal. This condition occurred while operators were installing electrical jumpers designed to bypass certain isolation signals for the suction valves in the residual heat removal (RHR) system that comprise the shutdown cooling flow path. These jumpers are installed under procedural guidance for the purposes of increasing the reliability of the shutdown cooling loop by disabling isolation signals that are not required to be operable in certain plant operating modes. Although it could not be proven, it appears that inadvertent contact with an energized circuit occurred during the jumper installation, causing a fuse to blow, de-energizing part of the primary isolation logic. This caused the automatic closure of Division 1 suction and return valves in the shutdown cooling loop, as well as valves connecting the reactor plant sampling systems to the RHR system. The main control room crew implemented recovery procedures to restore shutdown cooling to service at 0401 CST, prior to exceeding any temperature limits.

"This event resulted from the failure to maintain corrective actions in place that were develop after a similar event in 1994. Additionally, the operators were not using the type of jumpers required by the procedure, which likely contributed to the blown fuse.

"The RHR system operating procedure has been revised to require that the potentially affected valves in the shutdown cooling loop will be de-energized during jumper installation to eliminate the possibility of inadvertent isolation.

"This is being reported in accordance with 10 CFR 50.73(a)(1) as an invalid actuation of the primary containment isolation logic."

During this event, the RCS temperature increased from approximately 130 to 190 degree F.

The licensee will notify the NRC Resident Inspector.

 

 

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2 responses

10 03 2016
A Green Road Project

Reblogged this on A Green Road Daily News.

10 03 2016
flyingcuttlefish

trying to find photo or vid now … if I see anything I’ll add it …

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