Event Notification Report for January 28, 2025

OFFSITE NOTIFICATION

The following information was provided by American Centrifuge Operating, LLC via phone and email:

"An 80 kW Mobile Permit-By-Rule emergency generator with equipment number XQ80 (serial number ME0099) and an emissions number of P540 is expected to exceed the rolling twelve-month threshold of 500 hours by roughly 245 hours. This exceedance is being reported per Ohio Administrative Code, Rule 3745-31-30 [to the Ohio Environmental Protection Agency]."

AGREEMENT STATE REPORT - UNPLANNED CONTAMINATION

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

"On January 28, 2025, during an investigation, the licensee reported that, on one occasion, there was a spill involving americium-241 which required access to a room to be restricted for more than 24 hours at its facility. The licensee's radiation safety officer (RSO) stated the spill came from a small bucket located in an area where access was controlled for source security reasons. After the spill, the access was secured due to the americium spill. The RSO could not remember some of the information related to the event. The RSO agreed to submit a written report to the department within 24 hours. No individuals were contaminated and no other area was contaminated beyond the room where the event occurred. An update to this report will be provided once the additional information is received."

The activity level of the spill was not reported.

Texas Incident Report #: 10163
Texas NMED # TX250007

TECHNICAL SPECIFICATION REQUIRED SHUTDOWN

The following information was provided by the licensee via phone or email:

"On January 28, 2025 at 0832 EST, a technical specification (TS) required shutdown was initiated at Catawba Unit 1. TS action 3.4.13, condition 'B', was entered on January 28, 2025 at 0430 when operators detected a 1.4 gpm unidentified reactor coolant system leak. TS action 3.4.13, condition 'B' has a 'required action' to reduce leakage to within limits within 4 hours. This 'required action' was not completed within the completion time; therefore, a TS required shutdown was initiated per TS 3.4.13 condition 'C'.

"This event is being reported as a four-hour, non-emergency notification per 10 CFR 50.72(b)(2)(i) for `the initiation of any nuclear plant shutdown required by the plant's technical specifications.'

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

The following additional information was obtained from the licensee in accordance with Headquarters Operations Officers Report Guidance:

Based on elevated temperature readings on the pressurizer cavity in their lower containment, the licensee anticipates that the leak is in that location. The investigation is ongoing and they will ascertain more information when they reach Mode 3 and enter containment.

In addition, all safety systems are operable for Unit 1. Unit 2 was unaffected.