Event Notification Report for July 10, 2026

EN Revision Imported Date: 7/10/2026

EN Revision Text: HIGH PRESSURE COOLANT INJECTION INOPERABLE

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

"At 1445 CST on 1/18/2026, Browns Ferry Unit 1 high pressure coolant injection (HPCI) was declared inoperable due to 1-FCV-073-0006A, [HPCI steam line condensate inboard drain valve], and 1-FCV-073-0006B, [HCPI steam line condensate inboard drain valve], being found closed.

"This condition is being reported as an 8-hour non-emergency notification per 10-CFR 50.72(b)(3)(v).

"There was no impact to 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:
The HCPI steam line condensate inboard and outboard drain valves are air operated solenoid valves that failed closed. The cause is under investigation and restoration to the normal open position is currently in process. Technical Specification 3.3.5.1 Condition C was entered with a 14-day limiting condition for operation (LCO).

* * * RETRACTION ON 07/09/2026 AT 1601 EDT FROM TODD HORNSBY TO CHRISTOPHER PRESCOTT * * *

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

"Continued engineering evaluation has concluded that the condition initially reported would not have caused the HPCI system to be incapable of performing its safety function and that the system would have remained operable.

"The Licensee has notified the NRC Resident Inspector."

Notified R2DO (Mckown)

EN Revision Imported Date: 7/10/2026

EN Revision Text: PART 21 - GENERAL ELECTRIC RELAY FAILURE

The following is a summary of information provided by the licensee via email:

Curtiss Wright (CW) is submitting an evaluation report of a potential defect of a CW supplied relay, General Electric part number: 12IAV69A1A.
On January 26, 2026, Constellation notified Curtiss-Wright about the failure of a relay that was provided to Constellation on July 18, 2025. According to Constellation, the relay passed pre-installation bench testing but failed the functional test after replacement.
Constellation found that the power was no longer applied to the relay and had blown bus fuses. Checks of the new relay (failed relay) showed that wires were crossed, which shorted out the circuit.
On May 14, 2026, the relay was received by Curtiss-Wright from Constellation and Curtiss-Wright verified Constellation's assessment to be correct.

Because CW cannot establish a root cause, the following action is recommended:

CW has modified the dedication plan to specifically inspect the wiring to confirm the wiring of new items is equivalent to the originally qualified test sample prior to functional testing.
These actions should preclude a possible recurrence of this failure mechanism.

CW has not supplied P/N: 12IAV69A1A to any other end users.

Additional relay information:
CW tag number: CJ2139601
CW serial number: 01

Responsible Curtis-Wright representative:
Mark Papke
QA Manager
Curtiss-Wright
4600 East Tech Drive, Cincinnati, OH 45245

* * * UPDATE ON 07/09/2026 AT 1152 EDT FROM MARGIE HOVER TO CHRISTOPHER PRESCOTT * * *

CW submitted a final report of defect with the following additional information via email:

Since 2013, CW has supplied 31 relays with part number 12IAV69A1A, all of which were to Constellation Energy Dresden. Additionally, Curtiss Wright has 6 relays with part number 12IAV69A1A in process. All relays in process are for Constellation Energy Dresden. Curtiss Wright has not supplied 12IAV69A1A to any other customer.

Notified R3DO (Betancourt-Roldan), Part 21 Reactors (email).

AGREEMENT STATE REPORT - STUCK SHUTTER

The following is a summary of information provided by the Louisiana Radiation Protection Division via email:

On June 25, 2026, Dow Chemical Company notified the Division that a fixed gauge shutter was found in the open position and was not functioning properly during required six month operability checks. Because operators were concerned that the shutter might not reopen if closed, and the shutter was needed to remain open for the manufacturing process, they chose not to close it. The licensee plans to replace the device housing with a newly designed housing during a planned outage in February 2027.

Shutter Information:
Model: Vega SHF2B
Serial Number: 0368CR

Source Information:
Isotope and Activity: Cs 137, 500 mCi
Source Serial Number: 38953125

Louisiana Event Report ID No.: LA20260011