Event Notification Report for March 27, 2014

AGREEMENT STATE REPORT - STUCK SHUTTER ON FIXED GAUGE

The following information was received from the State of Arkansas via email:

"The licensee notified the Arkansas Department of Health via postal mail on Thursday, 03/27/2014 at 1420 hours, of the stuck shutter event. The State's event number is ARK-2014-003.

"The Ohmart source holder model number is HM-8 and the source contains 0.523 Curies of Cs-137. The problem was discovered during shutter checks and inventory. The licensee states that the gauge operations remain to be 24/7. The licensee stated that the area has been roped off and has proper posting. The licensee stated that they have notified applicable facility personnel of the radiological hazard and that there have been no known radiation exposures to personnel and/or members of the public.

"The shutter will be fixed by Ohmart (date unknown at this time), whom will also diagnose the root cause of this event. The State of Arkansas is awaiting a 30 day written report post repairs."

* * * UPDATE PROVIDED BY ANGIE HILL TO JEFF ROTTON AT 1412 EDT ON 03/31/2014 * * *

The State of Arkansas reported that the original discovery date of the stuck shutter was September 16, 2013. The manufacturer, Ohmart, will be on site from May 5-9, 2014 to repair the shutter and perform a root cause evaluation.


Notified R4DO (Gepford) and FSME Resources via email

* * * UPDATE FROM ANGIE HILL TO VINCE KLCO ON 5/27/14 AT 1530 EDT * * *

The following information was received from the State of Arkansas by email:

"The approved Vendor Service Engineer arrived at Georgia-Pacific on Friday, April 11, 2014, to inspect the Ohmart Model HM-8 gauge shutter. The licensee stated that the gauge shutter offered increased resistance, but was not stuck.

"The Vendor Service Engineer was able to move the handle by hand, verified that the shutter was not stuck, performed surveys and sealed source leak tests. The Vendor Service Engineer confirmed that there are no exposures of concern from the gauge, confirmed negative leaks and that the gauge is operating properly at this time.

"The licensee confirmed that there are no known personnel radiation exposures or dose to the member of the public from this event.

"The Department [Arkansas Department of Health] considers this event closed."

Notified the R4DO (Vasquez) and FSME Resources via email.

FITNESS FOR DUTY VIOLATION

"A contractor supervisor violated the Dominion Nuclear Connecticut FFD policy. The program member's access has been suspended pending assessment and management review.

"The NRC Senior Resident Inspector has been notified."

FAILURE OF SECONDARY CONTAINMENT DOOR INTERLOCK

"At 0151 [CDT] on March 27, 2014, indication was received in the Control Room that two Secondary Containment doors, in the 2/3 Diesel Generator Interlock, were opened simultaneously. An equipment operator, in the field at the time of the event, reported that while opening the reactor building side interlock doors, individuals were able to open the diesel side interlock doors. The interlock mechanism preventing both doors from operating simultaneously did not operate as expected.

"This condition represents a failure to meet Surveillance Requirement 3.6.4.1.2, since two doors in a singular access opening were allowed to open. As a result, entry into Technical Specification 3.6.4.1 Condition A was made due to Secondary Containment being inoperable. The doors were open for approximately 5 seconds and were immediately secured. Secondary Containment differential pressure was maintained throughout the event.

"This event is being reported in accordance with 10 CFR 50.72(b)(3)(v)(C) as a condition that could have prevented the fulfillment of a safety function.

"The NRC Resident Inspector has been notified."

PART-21 NOTIFICATION - ASSEMBLY ERRORS DURING BREAKER REFURBISHMENT

The following is a summary of the information provided via facsimile:

"On March 27, 2014, at Exelon-Dresden Station, plant personnel identified that breaker UTC # 1185084 (3B CCSW Pump Breaker) was in the CLOSED condition, but did not indicate CHARGED. The breaker was last CLOSED successfully on March 19, 2014. The breaker charges the closing springs after a CLOSE operation.

"The breaker was OPENED and removed from service on 3/28/14, Dresden notified [Nuclear Logistic, Inc.] NLI on 3/28/14 of the issue and the breaker was returned to NLI on RMA 351022093.

"NLI performed a failure analysis on the breaker. The spring clamp cam 12mm nylon insert lock nut was not properly tightened on either side, resulting in insufficient clamping force of the cam on the jackshaft. In addition to the lock nuts not being sufficiently tightened, the closing springs were installed on the wrong side. There is a left and a right spring as identified by a red mark on the left spring. The left side spring is the shorter spring, and it was installed on the right side. Further evaluation by NLI determined that this may have been a contributing factor to the failure after the closing spring clamp started to move off the jackshaft.

"The presence of the under torque nuts resulted in insufficient clamping force, allowing the clamp to move off the jackshaft. The springs being on the wrong sides began to exert excessive force to the cam as it rotated, and after many operations, it had slipped enough to become partially dislodged from the jackshaft. This bent the spring guide arms, preventing the rotation of the jackshaft to the CHARGED position and did not allow the motor cutoff switch to activate. The result was the breaker did not CHARGE and the motor continued to run until it burned up."

Several AHMG breakers (1200 and 2000A) for Dresden and Quad Cities were refurbished by Nuclear Logistics, Inc from 2008 to March 2014. At least one breaker was found with insufficient cam nut spring torque and had the two closing springs installed improperly.