Event Notification Report for March 06, 2014

AGREEMENT STATE - RADIOGRAPHY CAMERA SOURCE DISCONNECT

The following was received from the State of Texas via email:

"On March 10, 2014, the Agency [State of Texas] received notice of a radiography source disconnect that occurred on March 6, 2014. The source was a 92.2 curie iridium-192 radiography source. The event occurred at a temporary field site just south of the border with New Mexico near Carlsbad, NM on the Texas side. No exposures to the public resulted from this event. No overexposures resulted from this event. The cause of the event is unknown at this time. The source was retrieved by the licensee. The licensee's initial report to the Agency [State of Texas] was later than 24 hours after the event. Additional information will be supplied as it is received in accordance with SA-300."

Texas Incident #: I-9163


* * * UPDATE AT 0912 EDT ON 04/17/14 FROM ART TUCKER TO S. SANDIN VIA EMAIL * * *

"The Agency's investigation of this event has determined that there was no source disconnect, but that the radiographer failed to connect the source pigtail to the drive cable prior to connecting the drive assembly to the exposure device. Additional information will be provided in accordance with SA-300."

Notified R4DO (Gaddy) and FSME via email.


* * * UPDATE FROM ART TUCKER TO DONALD NORWOOD AT 1656 EDT ON 4/29/2014 * * *

"On April 29, 2014, the Agency received the final dose information for the radiographer who picked up the guide tube with the source still in it. A dose of 15.11 rem was assigned to his hand that picked up the guide tube and he received 509 millirem DDE on his whole body badge. Additional information will be provided as it is received in accordance with SA-300."

Notified R4DO (Haire) and FSME Events Resource.

FEED TUBE LEVEL SENSOR FAILED AS AN ITEM RELIED ON FOR SAFETY

"Feed tube level sensor was found to be in a state such that it has failed as an IROFS [Item Relied On For Safety] for a fire accident sequence leading to the loss of a criticality control. Another IROFS is in place and the accident sequence continues to meet performance requirements. Less than a safe mass was always maintained. This event is being reported because only one item relied on for safety, as documented in the Integrated Safety Analysis summary, remains available and reliable to prevent a nuclear criticality accident, and has been in this state for greater than eight hours.

"Portion of the plant affected: FMO [Fuel Manufacturing Operation] Press."

The licensee notified the North Carolina State Radiation Protection Branch, New Hanover County Emergency Management, and NRC Region II.

* * * UPDATE ON 4/3/14 AT 1457 EDT FROM SCOTT MURRAY TO DONG PARK * * *

"On 3/6/14, GNF-A [Global Nuclear Fuels - America] conservatively made a 1 hour event notification (EN 49878) due to a discovery that a feed tube level sensor had failed. After further review, it has been determined that a second control remained available, reliable, and the remaining IROFS was sufficient to meet performance requirements. As a result, the event notification is retracted."

Notified R2DO (Vias) and NMSS EO (Lombard).

UNANALYZED CONDITION REGARDING POTENTIAL TORNADO MISSILE DAMAGE TO EMERGENCY DIESEL EXHAUST PLENUM

"The condition described below is being reported as an unanalyzed condition per 10 CFR 50.72(b)(3)(ii)(B) and per the guidance of NUREG-1022, Rev. 3.

"On 03/06/2014 at 0906 PST, Diablo Canyon Power Plant (DCPP) identified a nonconforming condition involving the Emergency Diesel Generator (EDG) ventilation exhaust plenums installed in Unit 1 and Unit 2. Specifically, the radiator exhaust plenums and exhaust piping need to be re-evaluated to ensure adequate protection against flying debris that could be generated by a tornado.

"The occurrence of such an event is highly unlikely and there is no imminent concern regarding severe weather involving tornados. The EDGs are located inside the power plant structure and are capable of performing their safety function. Compensatory measures are being developed to address the associated nonconformance.

"This event does not adversely affect the health and safety of the public.

"The licensee informed the NRC Resident Inspector."

* * * UPDATE PROVIDED BY RUSS CRUZEN TO JEFF ROTTON AT 2245 EDT ON 09/09/2014 * * *

"This condition does not adversely affect the health and safety of the public.

"Based on an extent of condition review being performed for this event, the issue identified in the original event notification 49879 has also been determined to similarly affect the ventilation systems associated with the Unit 1 and 2 Vital 480 volt AC switchgear and battery/inverter equipment.

"The condition described in this update is being reported as an unanalyzed condition per 10 CFR 50.72(b)(3)(ii)(B) and as an event or condition that could have prevented the fulfillment of a safety function per 10 CFR 50.72(b)(3)(v)(A).

"Compensatory measures are being developed to address the associated condition.

"The licensee informed the NRC Resident Inspector."

Notified R4DO (Azua)

SECONDARY CONTAINMENT AIRLOCK DOOR INTERLOCK MALFUNCTION

"At 1605 EST on March 6, 2014, Operations determined that both the inner and outer secondary containment airlock doors, on the 50 foot elevation of the reactor building, had been simultaneously opened for approximately one minute on March 5, 2013. This event occurred while an employee was exiting secondary containment. The inner door failed to latch and opened as the employee was opening the outer door. Upon recognition of the condition the employee took action to secure both doors. The cause of this event was malfunction of the secondary containment airlock door interlock.

"This condition is being reported in accordance with 10 CFR 50.72(b)(3)(v)(C), event or condition that could have prevented fulfillment of a safety function needed to control the release of radioactive material. With both doors open, Surveillance Requirement 3.6.4.1.3 of Technical Specification 3.6.4.1, Secondary Containment, was not met, rendering secondary containment inoperable.

"Repairs to the secondary containment airlock door interlock have been completed.

"This event did not result in any adverse impact to the health and safety of the public.

"The NRC Senior Resident Inspector has been notified."