Event Notification Report for October 19, 2021

EN Revision Imported Date: 10/19/2021

EN Revision Text: AGREEMENT STATE REPORT - UNRETRACTABLE SOURCE

The following was received from the Pennsylvania Department of Environmental Protection (DEP) [the Department] via email:

"The Department received notification from a licensee on October 6, 2021, of a radiography source from a QSA 880 Delta Industrial Radiography device containing a 91 curie Ir-192 source that was unable to retract. The source had been exposed to check a weld and when the radiographer tried to retract the source, the slide would not lock the source in. The radiographer approached the set-up with a meter and noticed the readings were high, so he retreated. The area was roped off and put under surveillance by the Assistant Radiographer and Radiographer. The Radiographer also noticed his direct read dosimeter was off scale and so he remained outside the boundary. His dosimetry will be sent for emergency processing and he will be restricted from radiography work until his results are received.

"The licensee dispatched a Radiation Safety Officer [RSO] with source retrieval authorization to recover the source. The source was secured later the same morning of the event. The RSO received 60 millirem and his assistant received 20 millirem. The RSO's ring dosimeter will be sent out with the Radiographer badge for emergency processing. The DEP is currently in contact with the licensee and will update this event as soon as more information is provided."

Pennsylvania Event Report ID Number: PA210013

* * * UPDATE ON 10/18/2021 AT 1042 EDT FROM JOHN CHIPPO TO BRIAN LIN * * *
The following was received from the Pennsylvania Department of Environmental Protection (DEP) via email:

"Emergency processing of thermoluminescence detectors for the radiographer and assistant radiographer has been completed. The radiographer received approximately 9.3 rem and the assistant radiographer received approximately 2 rem. The licensee is continuing to monitor the radiographer's hands for erythema, as it was determined that the radiographer handled the guide tube and collimator with the 91 curie Ir-192 source in an unshielded position. Both workers have been put on mandatory leave and the licensee has committed to mandatory re-training of employees. A reactive inspection by the Department was conducted on October 12, 2021, and the licensee has gone through dose reconstruction and event re-enactments to determine how the disconnect occurred. At this time a bent pin on the control cable seems to be the cause of the event. More details will be provided when known."

Notified R1DO (BICKETT) and NMSS events Notification group (via email)

EN Revision Imported Date: 10/19/2021

EN Revision Text: EMERGENCY DIESEL GENERATORS SIMULTANEOUSLY INOPERABLE

"At 1930 CDT on 10/17/2021, it was discovered both of the Unit 2 Emergency Diesel Generators were simultaneously INOPERABLE with a requirement to have one OPERABLE train; therefore, this condition is being reported as an eight-hour, non-emergency notification per 10CFR 50.72(b)(3)(v). Offsite power was OPERABLE during this event.

"There was no impact on the health and safety of the public or plant personnel. The NRC Senior Resident Inspector has been notified."

The cause was corrected and both Emergency Diesel Generators are currently operable.

PART 21 - PRESSURE REGULATOR VALVE FAILURE

The following is a summary of the report provided by Engine Systems Inc.:

The vendor supplied information to the NRC involving a defect and/or failure related to a pressure regulator valve installed on an emergency diesel generator at Brunswick Nuclear Power Plant. The valve did not properly regulate starting air pressure and allowed equalization of inlet pressure to outlet. Subsequent investigation by the vendor revealed a raised edge on the metal seating surface of the valve that caused the PTFE (Teflon) seat to tear. Equalization of starting air pressure is undesirable since it may inhibit operation of the downstream starting air solenoid valve, thus compromising the ability of the emergency diesel generator to start and support safety-related loads. The evaluation is complete. This Part 21 applies only to valves in the Brunswick Nuclear Power Plant.

Corrective Actions: Brunswick continues to monitor the outlet pressure from the regulator and verify the inlet and outlet pressures have not equalized. The vendor also recommends that existing regulators have an inspection performed on-site and at the vendor. The vendor will add inspections to the dedication package for new and refurbished pressure regulator valves to verify a smooth, rounded transition at the valve seat of the throttling sleeve.

Technical questions concerning this notification can be directed to Dan Roberts, Quality Manager, and John Kriesel, Engineering Manager.