Event Notification Report for October 18, 2022

EN Revision Imported Date: 10/17/2022

EN Revision Text: FOUR AUTOMATIC DEPRESSURIZATION SYSTEM VALVES INOPERABLE

The following information was provided by the licensee via email:

"At 1215 CDT on 8/19/2022, with Grand Gulf Nuclear Station in Mode 1 and at 100 percent power, four Automatic Depressurization System (ADS) valves were rendered inoperable due to a loss of system pressure. The station entered Technical Specification 3.5.1 Condition G.

"This event is being reported under 10 CFR 50.72(b)(3)(v)(D) as an event or condition that could have prevented the fulfillment of a safety function.

"There were no other systems affected as a result of this condition.

"The NRC Senior Resident Inspector was notified."

The following additional information was obtained from the licensee in accordance with Headquarters Operations Officers Report Guidance: Plans are to remain in Mode 1 until corrected or until driven by the Technical Specifications to shut down (12-hour LCO from 1215 CDT on 8/19/2022).


* * * RETRACTION ON 10/14/22 AT 1311 EDT FROM JEFF HARDY TO KAREN COTTON * * *

"Grand Gulf Nuclear Station (GGNS) is performing this notification to retract event EN 56058 that was reported on August 19, 2022. Previously, GGNS notified the NRC that four Automatic Depressurization System (ADS) valves were inoperable due to a loss of system pressure.

"Based upon further investigation, the condition reported in EN 56058 was found to affect only a single ADS valve. As a result, it was determined that an event or condition that could have prevented the fulfillment of a safety function did not exist at GGNS. Sufficient redundancy existed to perform the safety function.

"The NRC Resident Inspector has been notified of the retraction."

R4DO (Kellar) was notified.

EN Revision Imported Date: 10/17/2022

EN Revision Text: TECHNICAL SPECIFICATION REQUIRED SHUTDOWN

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

"At 2342 CDT on August 19, 2022, with Grand Gulf Nuclear Station in Mode 1 and at 40 percent power, the station initiated a normal shutdown to comply with its Technical Specifications (TS). The station entered Mode 3 at 0000 CDT August 20, 2022 to comply with (LCO) 3.5.1 Condition G Action G.1 due to the condition reported to NRC previously (EN 56058).

"This event is being reported under 10 CFR 50.72(b)(2)(i) as a shutdown required by the plant's technical specifications.

"The NRC Senior Resident Inspector was notified."

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

The plant is now in a 36-hour LCO to be in Mode 4 due to Low Low Set Valves inoperability per TS 3.6.1.6.

* * * RETRACTION ON 10/14/2022 AT 1311 FROM JEFF HARDY TO LAUREN BRYSON * * *

"Grand Gulf Nuclear Station (GGNS) is performing this notification to retract event EN 56059 that was reported on August 20, 2022. Previously, GGNS notified the NRC that it had initiated a shutdown required by Technical Specifications to comply with Limiting Condition of Operation (LCO) 3.5.1 Condition G.1 due to the inoperability of four Automatic Depressurization System (ADS) valves.

"Following the shutdown, GGNS completed walkdowns and determined that the condition affected only one ADS valve. As a result, the shutdown to satisfy the required actions of TS LCO 3.5.1 Condition G.1 was not required.

"The NRC Resident Inspector has been notified of the retraction."

R4DO (Kellar) was notified.

AGREEMENT STATE REPORT - DAMAGED GAUGE

The following is a summary of information received from the South Carolina Department of Health and Environmental Control [the Department] via email:

At 1420 EDT on October 10, 2022, the Department received a call from Summit Engineering (the licensee) to report that at approximately 1230 EDT, a double pin road roller used for paving hit a Troxler 3440 gauge (SN #34989), cracking its plastic outer covering. The licensee's radiation safety officer arrived onsite and arranged to have the gauge transported back to the licensee's office. The Department traveled to the licensee's office to survey the damaged gauge. The Department found the gauge's source in the shielded position and surveys read no higher than 8 mR/hr on the surface of the gauge and no higher than 0.06 mR/hr at a foot away. The licensee stated that the gauge would be sent back to the manufacture for repair.

EN Revision Imported Date: 10/19/2022

EN Revision Text: AGREEMENT STATE REPORT - MEDICAL MISADMINSTRATION

The following summary was received from the Minnesota Department of Health via email:

A patient undergoing Lu-177 therapy was administered 110 mCi vice the prescribed 200 mCi. An investigation is in progress by the Minnesota Department of Health.

A Medical Event may indicate potential problems in a medical facility's use of radioactive materials. It does not necessarily result in harm to the patient.

Minnesota Event ID: MN220005

* * * UPDATE FROM TYLER KRUSE TO DONALD NORWOOD AT 0907 EDT ON 10/17/2022 * * *
The following information was received via email:
"The event date for this event was 09/28/2022. This event was discovered while investigating the event that occurred on 09/27/2022." [That event is recorded as EN56137.]
Notified R3DO (Kunowski) and NMSS Events Notification email group.