Dominion Probes Shutdown of North Ann...

Dominion Probes Shutdown of North Anna Nuclear Reactor - NBC29 WVIR Charlottesville, VA News, Spo...

There are 10 comments on the NBC29 Charlottesville story from Oct 24, 2012, titled Dominion Probes Shutdown of North Anna Nuclear Reactor - NBC29 WVIR Charlottesville, VA News, Spo.... In it, NBC29 Charlottesville reports that:

Dominion Virginia Power is investigating what caused one of the two nuclear reactors at its North Anna power station to automatically shut down on Wednesday.

Join the discussion below, or Read more at NBC29 Charlottesville.

time is ticking

United States

#1 Oct 24, 2012
this place is destined for epic failure...
it's cooling system is entirely dependent on a lake, held back by a dam, built in an area with frequent seismic activity, and the place is only built to withstand a quake two tenths of a richter more powerful than the last one which occured, shutting the plant down. it's time to decommision this plant and build a modern plant in a safer location, or find another source of energy. doing so could put plenty of people to work...
Ice Dogg

Cumming, GA

#2 Oct 24, 2012
time is ticking wrote:
this place is destined for epic failure...
it's cooling system is entirely dependent on a lake, held back by a dam, built in an area with frequent seismic activity, and the place is only built to withstand a quake two tenths of a richter more powerful than the last one which occured, shutting the plant down. it's time to decommision this plant and build a modern plant in a safer location, or find another source of energy. doing so could put plenty of people to work...
Agreed! We also need to greatly expand our nuclear power capability!
John

United States

#3 Oct 24, 2012
What else would you cool the reactors with? Need a water source somehow. Ocean,LAKE..
Meltdown

Cumming, GA

#4 Oct 24, 2012
The past damage and earthquake intensity was just a warning. But nobody will listen to God. Close the place and build it on more stable ground.
JJM

Charlottesville, VA

#5 Oct 24, 2012
Thats not something to play around with, It can cause alot of damage to the peoples and places we call home!
HooYou

Charlottesville, VA

#6 Oct 24, 2012
^^^ D A M N tree huggers!
Meltdown

Cumming, GA

#7 Oct 24, 2012
A catastrophe at North Anna and a steady northeastly breeze would take much of the radiation right into the nation's capital. I imagine the National Security Agency is watching North Anna rather closely now.
Toothless

Lovingston, VA

#8 Oct 24, 2012
With all the troubles they are having, I think it is time to look into the people that are treating the lake water for the cooling of the reactors.
wow

Mobile, AL

#9 Oct 25, 2012
Paranoia abounds.
Erica Gray

United States

#10 Oct 25, 2012
From NRC event page ~
AUTOMATIC REACTOR TRIP ON LOW STEAM GENERATOR WATER LEVEL

"On 10/24/12 at 0147, North Anna Unit 2 reactor tripped automatically. The reactor first out is the 'C' steam generator lo-lo level. The turbine first out is reactor tripped, turbine trip. The event was apparently initiated by a loss of load on the secondary side. The cause of the loss of load is still being investigated. All systems responded as expected. This event is reportable per 10 CFR 50.72(b)(2)(iv)(B) due to actuation of the Reactor Protection System.

"The Auxiliary Feedwater pumps received an automatic start signal due to low-low level in all steam generators at the time of the trip, Steam generator levels have been restored to normal operating level. The Auxiliary Feedwater System operated as designed with no abnormalities noted. This event is reportable per 10 CFR 50.72(b)(3)(iv)(A) due to actuation of an ESF system.

"All control rods inserted into the core at the time of the trip and decay heat is being removed via the main condenser steam dumps. Several secondary [feedwater] relief valves lifted and reseated during the event. North Anna Unit 2 is currently stable at no load temperature and pressure in mode 3.

"At 0147 EDT, the Unit 2 Pressurizer Power Operated Relief Valve (PORV), 2-RC-PCV-2455C, opened during an automatic reactor trip of Unit 2. The valve indicated open for less than 1 second. During this time, the identified leakage threshold for EAL SU6.1 [25 gpm] was exceeded."

The cause of the loss of secondary load, which is believed to have caused the low steam generator water level and the lifting of the pressurizer PORV, is still under investigation. The licensee is focusing on the high pressure to low pressure turbine intercept valves or reheat valves going shut for reasons unknown at this time. The licensee's data shows that a pressurizer PORV opened momentarily. The instantaneous leak rate exceeded the unusual event threshold leak rate of 25 gpm. The PORV reseated and no ongoing leakage occurred during the transient. The rest of the transient was characterized as uncomplicated. The unit is in a normal post-trip electrical configuration. All systems functioned as required. There was no impact on Unit 1.
The licensee has notified the NRC Resident Inspector.

So how many gallons leaked?
Plus I would like to see an update on what the radioactive tritium levels are now....both North Anna and Surry reported finding tritium on their grounds, not that long ago?

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