Event Notification Report for September 05, 2015
U.S. Nuclear Regulatory Commission
Operations Center
EVENT REPORTS FOR
09/04/2015 - 09/05/2015
EVENT NUMBERS
51374
Power Reactor
Event Number: 51374
Facility: DRESDEN
Region: 3 State: IL
Unit: [] [2] [3]
RX Type: [1] GE-1,[2] GE-3,[3] GE-3
NRC Notified By: LAUREN SYKORA
HQ OPS Officer: STEVE SANDIN
Region: 3 State: IL
Unit: [] [2] [3]
RX Type: [1] GE-1,[2] GE-3,[3] GE-3
NRC Notified By: LAUREN SYKORA
HQ OPS Officer: STEVE SANDIN
Notification Date: 09/05/2015
Notification Time: 17:24 [ET]
Event Date: 09/05/2015
Event Time: 10:10 [CDT]
Last Update Date: 09/05/2015
Notification Time: 17:24 [ET]
Event Date: 09/05/2015
Event Time: 10:10 [CDT]
Last Update Date: 09/05/2015
Emergency Class: NON EMERGENCY
10 CFR Section:
50.72(b)(3)(v)(C) - POT UNCNTRL RAD REL
10 CFR Section:
50.72(b)(3)(v)(C) - POT UNCNTRL RAD REL
Person (Organization):
RICHARD SKOKOWSKI (R3DO)
RICHARD SKOKOWSKI (R3DO)
| Unit | SCRAM Code | RX Crit | Initial PWR | Initial RX Mode | Current PWR | Current RX Mode |
|---|---|---|---|---|---|---|
| 2 | N | Y | 100 | Power Operation | 100 | Power Operation |
| 3 | N | Y | 80 | Power Operation | 80 | Power Operation |
SECONDARY CONTAINMENT INOPERABLE DUE TO LOSS OF VACUUM FROM OPEN INSPECTION HATCH
"At 1010 [CDT] on September 5, 2015, Reactor Building differential pressure did not meet the required 0.25 inches of vacuum due to an open inspection hatch. At 1018 [CDT], an inspection hatch was found to have fallen open and [was] subsequently closed [manually] on the Reactor Building exhaust fan damper access hatch. The damper is outside of the Reactor Building secondary containment isolation boundary. Following closure of the hatch, Reactor Building differential pressure returned to greater than or equal to 0.25 inches of vacuum water gauge.
"This condition represents a failure to meet Surveillance Requirement 3.6.4.1.1. As a result, entry into Technical Specifications 3.6.4.1 condition A was made due to Secondary Containment being inoperable. 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 Senior Resident Inspector has been notified."
"At 1010 [CDT] on September 5, 2015, Reactor Building differential pressure did not meet the required 0.25 inches of vacuum due to an open inspection hatch. At 1018 [CDT], an inspection hatch was found to have fallen open and [was] subsequently closed [manually] on the Reactor Building exhaust fan damper access hatch. The damper is outside of the Reactor Building secondary containment isolation boundary. Following closure of the hatch, Reactor Building differential pressure returned to greater than or equal to 0.25 inches of vacuum water gauge.
"This condition represents a failure to meet Surveillance Requirement 3.6.4.1.1. As a result, entry into Technical Specifications 3.6.4.1 condition A was made due to Secondary Containment being inoperable. 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 Senior Resident Inspector has been notified."