Event Notification Report for May 17, 2022

EN Revision Imported Date: 5/17/2022

EN Revision Text: AGREEMENT STATE REPORT - GROUNDWATER CONTAINING URANIUM IDENTIFIED DURING EXCAVATION

The following was received from the Utah Department of Environmental Quality via email:

"On April 18, 2022, Licensee personnel reported a strong fuel smell coming from a recent excavation associated with a new facility under construction. The excavations for sumps extended into the groundwater and were not included on the conditionally approved plans. The smell triggered an investigation where groundwater samples were collected for both chemical and radiological analysis. One sample indicated a concentration of 12,000 pCi/L of uranium (preliminary findings). The presence of uranium in the groundwater was unanticipated. Subsequently, the Division of Waste Management and Radiation Control has communicated to the licensee to characterize the nature and extent of the contamination. The Division is waiting for additional information from the licensee."

Event Report ID No.: UT220003

* * * UPDATE AT 1612 EDT ON MAY 16, 2022, FROM JALYNN KNUDSEN TO BRIAN P. SMITH * * *

The following update was received from the Utah Department of Environmental Quality (the agency) via email:

"On April 18, 2022, [Licensee] personnel reported a strong fuel smell coming from a recent excavation associated with a new facility under construction. The [Licensee] did not anticipate encountering groundwater at the depth of excavation. Upon encountering the groundwater and observing a hydrocarbon odor, the Licensee collected groundwater samples for both organic and radiological analysis. The preliminary screening of one sample indicated a potentially high concentration of uranium. The preliminary result of the analysis was reported to the agency with the intent to conduct additional confirmatory work. The Licensee contends that the initial high concentrations were in error due to improper analytical methodology. These results were presented to the agency prior to confirmation. Results of further investigation by the Licensee indicate that the contaminant was thorium, not uranium, and that all radionuclides were below detection limits.

"The agency collected confirmatory samples for analysis and is awaiting results of both organic and radiological analysis.

"The Licensee is preparing an investigation plan to fully characterize the nature and extent of the contamination."

Event Report ID No.: UT220003 (updated)

Notified R4DO (Gepford) and NMSS Events Notification (email).

AGREEMENT STATE REPORT - INDUSTRIAL RADIOGRAPHY EQUIPMENT FAILURE

The following is a summary received from the New Mexico Environmental Protection Division (the agency) via phone:

On 05/09/22, at 0934 MDT, the agency was notified of an industrial radiography event that occurred on 04/11/22. The licensee reported a mechanical equipment failure and that no exposure occurred. The agency is en route to follow-up and gather additional details on the event.

The agency also notified R4 (Erickson).

AUTOMATIC SCRAM DUE TO ELECTRICAL TRANSIENTS

The following information was provided by the licensee via fax:

"Unit 2 experienced multiple electrical transients resulting in a Group I Primary Containment Isolation Signal (PCIS) isolation and subsequent unit reactor scram. Low reactor water level during the automatic scram caused PCIS Group II and III isolation signals. Following the PCIS Group I isolation, all main steam lines isolated. All control rods inserted and all systems operated as designed."

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

Peach Bottom Unit 2 automatically scrammed from 100 percent power due to an electrical transient and subsequent PCIS Group I isolation (Main Steam Isolation Valve closure). Unit 2 lost main feedwater due to the PCIS Group I isolation, however, all other systems responded as expected following the scram. High Pressure Coolant Injection is maintaining pressure control while Condensate Pumps are maintaining inventory. The unit is currently stable and in Mode 3. Peach Bottom Unit 3's Adjustable Speed Drives were impacted by the electrical transients and the unit reduced power to 98 percent power.

The NRC Resident Inspector was notified.