Elsa David

1 min · 

UNIT 1 AUTOMATIC REACTOR SCRAM DUE TO PARTIAL LOSS OF OFFSITE POWER 

"At 1004 CDT, Arkansas Nuclear One, Unit 1 (ANO-1) reactor automatically tripped due to the partial loss of offsite power. At the time of the trip, the site was in a Tornado Warning and a Severe Thunderstorm Warning. The Emergency Feedwater (EFW) system auto-actuated due to the loss of main feedwater pumps and the loss of the Reactor Coolant pumps. Both Emergency Diesel Generators started as expected with only  one loading as expected. All control rods fully inserted. Currently, ANO-1 has stabilized in Hot Standby via natural circulation.
"ANO-1 also lost Spent Fuel Pool cooling for approximately 69 minutes. The temperature of the spent fuel pool at the beginning of the event was approximately 102 [degrees] F. The spent fuel pool saw a heatup of 1 [degree] F during the loss of spent fuel pool cooling. The Spent Fuel Pool cooling has been restored.
"ANO-2 is currently in a refueling outage with all fuel in the spent fuel pool. ANO-2 completed a full core off load to the spent fuel pool and this was completed on April 12, 2017. Spent Fuel Pool cooling was lost for approximately 10 minutes. The Spent Fuel Pool temperature was 91 [degrees] F prior to the event. No heat up of the pool was identified during the event. Cooling has subsequently been restored. The #1 Emergency Diesel Generator auto-started as designed but did not supply the safety bus due to availability of offsite power.

Black Mask

2 min · 

 Good morning! Welcome back to war! " LOST SOURCE 
The following information was received from the State of New Jersey via facsimile: 
"The RSO [Radiation Safety Officer] for this cardiology office called to report a lost/missing Cs-137 dose calibrator vial source. Control of this facility was recently transferred to a medical center. When the new RSO visited the cardiology office to become familiar with it, it was discovered that the Cs-137 source was missing. The source, as listed on the cardiology office's inventory, contained 199.04 uCi [microCuries] of activity as of its calibration date of 9/1/2005. The decayed source would contain approximately 152.2 uCi [microCuries] of activity as of the date of this notification. The manufacturer and model # of the source were not immediately available. The RSO will follow-up with a written report within 30 days."
THIS MATERIAL EVENT CONTAINS A "LESS THAN CAT 3" LEVEL OF RADIOACTIVE MATERIAL
Sources that are "Less than IAEA Category 3 sources," are either sources that are very unlikely to cause permanent injury to individuals or contain a very small amount of radioactive material that would not cause any permanent injury. Some of these sources, such as moisture density gauges or thickness gauges that are Category 4, the amount of unshielded radioactive material, if not safely managed or securely protected, could possibly - although it is unlikely - temporarily injure someone who handled it or were otherwise in contact with it, or who were close to it for a period of many weeks."