Event Notification Report for December 03, 2018

ACTUATION OF BLACKOUT SEQUENCERS DUE TO LOSS OF ONE OFFSITE POWER SOURCE

"At 0315 [CST] on 12/3/18, the Comanche Peak Nuclear Power Plant experienced a loss of 138 KV transformer XST1. Unit 1 is currently at 100% power. Unit 2 was subjected to actuation of both blackout sequencers causing an automatic start of both motor driven Auxiliary Feedwater (AFW) pumps as well as the turbine driven AFW pump.

"No emergency diesel generators started as per design. Train A and B motor driven and the turbine driven AFW pumps have been returned to automatic. All other safety systems functioned per design.

"The loss of power to 138 KV transformer XST1 resulted in loss of power to both safeguards busses on Unit 2. The busses performed a load-shed and slow transfer to power supplied from 345 KV transformer XST2A as designed and were re-energized and loads sequenced back onto the busses. The emergency diesel generators are not required to start unless the busses are not re-energized by the alternate offsite transformer. All electrical power related actuations functioned as designed. There was no impact on Unit 1.

"The licensee has notified the NRC Resident Inspector."

AGREEMENT STATE REPORT - STOLEN DENSITY GAUGE

The following was received from the State of California by email:

"On 12/03/18, the RSO [Radiation Safety Officer] contacted CA Office of Emergency Services (OES) to report a stolen density gauge. The gauge involved is a Troxler Model 4640-B, S/N 1292, containing 9 mCi of Cs-137 (thin lift asphalt density gauge). The parked vehicle [in San Francisco, CA] was broken into and the gauge was stolen during overnight hours. According to the RSO, at the time of the theft, the gauge was locked inside a Type A container with additional locks securing the gauge to the vehicle. The gauge user was enroute to a field job in the area near Quality Inn where the theft occurred.

"The RSO has immediately notified South San Francisco Police Department of the theft (Report # 18-7086). Licensee will be posting a reward for safe return of the gauge. RHB [CA Department of Public Health - Radiologic Health Branch] will be following up on this investigation."

5010 Number: 120318

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. For additional information go to http://www-pub.iaea.org/MTCD/publications/PDF/Pub1227_web.pdf

AGREEMENT STATE REPORT - SOURCE ABANDONMENT THROUGH BANKRUPTCY

The following was received from the Louisiana Radiation Protection Department (LDEQ/ERSD/Radiation Section) via e-mail:

"On or about December 3, 2018, [an individual] contacted KLS Physics to inform them he had acquired some sealed sources (check sources) in a bankruptcy liquidation of assets. KLS Physics had provided physics support to HVA [Heart & Vascular Associates, PC] for their Radioactive Materials Program. KLS Physics instructed [the individual] to contact LDEQ/ERSD/Radiation Section to determine how to proceed correcting/solving the situation.

"LDEQ staff received [the individual's] notification on December 3, 2018. The inventory performed by KLS Physics on December 4, 2018, indicated the five (5) sources are check sources of Cs-137 and Co-57. The activities range from 0.02 microCuries Co-57 to 176 microCuries of Co-57. At this time, the Department has taken possession of three of the sources.

"LDEQ has assigned this NMED Incident to an investigator. This is a preliminary investigation report. Information will be updated when available.

"The five sources were abandoned by [the licensee], who is the registered owner of Heart and Vascular Associates, PC. [The licensee's] equipment was sold during a bankruptcy liquidation to pay expenses. The licensed source possession and Regulatory Reporting requirements are [the licensee's] responsibility.

"LDEQ staff received [the individual's] notification on December 3,2018. He reported the acquisition of the sources to KLS Physics Services. The name was on documents included in the box of equipment. KLS in turn had him contact the LDEQ's Radiation Section.

"The Department dispatched an inspector to [the individual's] residence to assess the situation. [The individual] only had three of the five sources in question. All three were is their lead pigs and surface readings were minimal. Staff personnel is still attempting to contact [the licensee] about the remaining two sources."

The LDEQ reported that the sources that were found had the following activities: 69.35 microCuries of Cs-137, 57.98 microCuries of Cs-137, and 0.01 microCuries of Co-57. The sources that are still missing had the following activities: 176 microCuries of Co-57 and 0.62 microCuries of Cs-137.

Louisiana Event Report ID No.: LA-180019

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. For additional information go to http://www-pub.iaea.org/MTCD/publications/PDF/Pub1227_web.pdf