Event Notification Report for December 13, 2022

EN Revision Imported Date: 12/13/2022

EN Revision Text: AGREEMENT STATE REPORT - DAMAGED TROXLER GAUGE

The following information was provided by the South Carolina Department of Health and Environmental Control (The Department) via email:

"The Department was notified on 11/18/22 at 1243 EST via telephone that a Troxler 3400 series portable moisture density gauge, serial number 33556, had been hit by a piece of construction equipment.

"The Troxler 3400 series portable moisture density gauge contains a maximum activity of 9 millicuries of Cs-137 and 44 millicuries of Am-241:Be. The licensee reported the source rod had been dislodged but had been successfully inserted back into the shielded position. A Department inspector was dispatched to the location on 11/18/22 and assisted the licensee in packing the damaged Troxler 3400 series device into the transport container. Dose rate readings using a ND-2000A survey instrument, calibrated 09/16/22 indicated readings as high as 30 mR/hr on the surface of the transport container and less than 1 mR/hr at 1 meter.

"The Troxler 3400 series moisture density gauge was transported and secured at the licensee's storage location and is awaiting shipment back to the manufacturer. This event is still under investigation by the South Carolina Department of Health and Environmental Control."

* * * UPDATE ON 12/12/2022 AT 1052 EST FROM ADAM GAUSE TO BRIAN LIN * * *

The following information was provided by the South Carolina Department of Health and Environmental Control (The Department) via email:

"The licensee submitted a written report, dated 11/28/22, outlining the event details and findings. The licensee did not indicate overexposure to any individuals. Records indicate the damaged gauge was not leaking and that the gauge/sources have been transferred to the manufacturer for disposal. This event is considered closed."

Notified R1DO (Henrion) and NMSS Events Notification email group.

AGREEMENT STATE REPORT - RADIOGRAPHY CAMERA MALFUNCTION

The following information was provided by the Texas Department of State Health Services via email:

"On December 5, 2022, the licensee reported that an equipment malfunction occurred with a Source Production & Equipment Company, Inc. (SPEC) 150 Radiography Camera, serial number 1524, containing 66 curies of Iridium-192. They were testing the camera in the office because the technician reported it started to hang up several times when retrieving the source and disconnecting the crank cables. The camera was tested and the source was retrieved but they were unable to disconnect the crank cables. They had to cut the locking device, remove the cables, and install a plug. The camera and cables are being transported to a service company for inspection and repair. No additional radiation exposure occurred from the incident. SPEC source serial number DI2710. Additional information will be provided in accordance with SA 300."

Texas Incident No.: I - 9969

AGREEMENT STATE REPORT - LOST EXIT SIGNS

The following information was provided by the Colorado Department of Public Health and Environment via email:

The licensee discovered twelve tritium exit signs were lost. The exit signs are SRB Technologies Model BR20BK containing 20 Ci of tritium (H-3) each. This is being reported under Colorado Regulations Section 4.51.1.1 (10 CFR 20.2202(a)(1)(i)).

Colorado Incident No.: CO220043

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

DAMAGED RADIOGRAPHIC CAMERA

The following information was provided by the licensee via email:

"At 0200 YST on December 06, 2022, the radiation safety supervisor (RSS) received a call that the technicians had a source which refused to retract to the safe and secured position. During the exposure, the camera fell approximately 4 feet to the ground and landed on the guide tube, which then didn't allow the source to be returned to a shielded position. The radiographers on site followed their procedure and secured their boundaries and notified the RSS. Two RSSs arrived on site at 0245 YST and were able to safely return the source back to locked position. At 1000 YST, a third RSS arrived on location to assist in retrieval.

"The source that required retrieval was IR-192 at 80.6 curies in a Type B container/special form."

PART 21 - INADEQUATE TORQUE VALUES

The following information was provided by the licensee via email:

"On October 13, 2022, during Refueling Outage 25, 2 bolts and 2 washers were discovered in the strainer basket upstream of the main steam stop valve in the steam line from the 'A' steam generator. It was determined that these bolts and washers were from the main steam isolation valve (MSIV) upstream of the stop valve. One bolt and one washer were also determined to be missing from the MSIV on the line from the 'B' steam generator. The MSIVs are a similar design as the Main Feedwater Isolation Valves (MFIVs). It appears that the torque values for these backseat bolts provided by the vendor weren't sufficient to prevent the bolts from coming loose. Wolf Creek Nuclear Operating Corporation personnel evaluated the condition and determined that the inadequate torque values provided by the vendor could have constituted a substantial safety hazard if left uncorrected. In particular, if bolts had come loose from the MFIVs, they could have traveled downstream to the steam generators and then challenged the integrity of steam generator tubes.

"The NRC Senior Resident Inspector has been notified.

"This is a non-emergency notification required by 10 CFR 21.21(d)(3)(i).

"A written notification will be provided within 30 days."