Event Notification Report for April 22, 2012
U.S. Nuclear Regulatory Commission
Operations Center
EVENT REPORTS FOR
04/21/2012 - 04/22/2012
EVENT NUMBERS
48030
Power Reactor
Event Number: 48030
Facility: OCONEE
Region: 2 State: SC
Unit: [1] [2] [3]
RX Type: [1] B&W-L-LP,[2] B&W-L-LP,[3] B&W-L-LP
NRC Notified By: COREY GRAY
HQ OPS Officer: PETE SNYDER
Region: 2 State: SC
Unit: [1] [2] [3]
RX Type: [1] B&W-L-LP,[2] B&W-L-LP,[3] B&W-L-LP
NRC Notified By: COREY GRAY
HQ OPS Officer: PETE SNYDER
Notification Date: 06/15/2012
Notification Time: 16:00 [ET]
Event Date: 04/22/2012
Event Time: 19:58 [EST]
Last Update Date: 06/15/2012
Notification Time: 16:00 [ET]
Event Date: 04/22/2012
Event Time: 19:58 [EST]
Last Update Date: 06/15/2012
Emergency Class: NON EMERGENCY
10 CFR Section:
50.73(a)(1) - INVALID SPECIF SYSTEM ACTUATION
10 CFR Section:
50.73(a)(1) - INVALID SPECIF SYSTEM ACTUATION
Person (Organization):
DAVID AYRES (R2DO)
DAVID AYRES (R2DO)
| Unit | SCRAM Code | RX Crit | Initial PWR | Initial RX Mode | Current PWR | Current RX Mode |
|---|---|---|---|---|---|---|
| 1 | N | Y | 100 | Power Operation | 100 | Power Operation |
| 2 | N | Y | 100 | Power Operation | 100 | Power Operation |
| 3 | N | N | 0 | Refueling | 0 | Refueling |
KEOWEE HYDRO POWER STATION AUTOMATICALLY STARTED BASED ON AN INVALID SIGNAL
"At 1958 [EDT] on 4/22/2012, Oconee emergency power (Keowee Hydro Station Units 1 and 2) automatically started based upon an invalid signal. In progress at the time was the Unit 3 Keowee Emergency Start Channel B Isolations section of the Unit 3 Engineered Safety Features Actuation System Replacement Modification procedure. A step in this procedure provided direction for a jumper to be connected between links B-13 and B-14. However, this jumper was placed between links A-13 and A-14, which caused the start of the Keowee units. During the period the jumpers were inadvertently installed, the Keowee units remained operable and available to supply emergency power to Units 1, 2, and/or 3. Both Keowee units were shutdown from the inadvertent emergency start actuation and the emergency start signal was reset per procedure at 0156 [EDT] hours on 4/23/2012.
"The cause for the misplaced jumper was determined to be a human performance error by the technicians.
"As required per NUREG 1022, Rev.2 the following information is provided:
"(a) The specific train(s) and system(s) that were actuated: In this event, both Keowee Hydro Units 1 and 2 actuated because of the emergency start signal being generated by Channel A.
"(b) Whether each train actuation was complete or partial: The automatic actuation of the Keowee units was completed.
"(c) Whether or not the system started and functioned successfully: No problems or issues were identified with the performance of the Keowee Hydro Units in response to the emergency start.
"Therefore this condition is being reported for Oconee 1, 2, and 3 as an invalid actuation under 10 CFR 50.73 (a)(2)(iv)(A), which allows NRC notification via telephone per 10 CFR 50.73(a)(1).
"Corrective Actions:
"- Work was stopped on the Unit 3 Engineered Safety Features Actuation System Replacement Modification procedure;
"- Immediate investigation was conducted to determine the impact of the jumper activity as well as development of a recovery plan; and
"- The jumper was removed from links A-13 and A-14 and the Keowee units were shutdown."
The NRC Resident Inspector was informed.
"At 1958 [EDT] on 4/22/2012, Oconee emergency power (Keowee Hydro Station Units 1 and 2) automatically started based upon an invalid signal. In progress at the time was the Unit 3 Keowee Emergency Start Channel B Isolations section of the Unit 3 Engineered Safety Features Actuation System Replacement Modification procedure. A step in this procedure provided direction for a jumper to be connected between links B-13 and B-14. However, this jumper was placed between links A-13 and A-14, which caused the start of the Keowee units. During the period the jumpers were inadvertently installed, the Keowee units remained operable and available to supply emergency power to Units 1, 2, and/or 3. Both Keowee units were shutdown from the inadvertent emergency start actuation and the emergency start signal was reset per procedure at 0156 [EDT] hours on 4/23/2012.
"The cause for the misplaced jumper was determined to be a human performance error by the technicians.
"As required per NUREG 1022, Rev.2 the following information is provided:
"(a) The specific train(s) and system(s) that were actuated: In this event, both Keowee Hydro Units 1 and 2 actuated because of the emergency start signal being generated by Channel A.
"(b) Whether each train actuation was complete or partial: The automatic actuation of the Keowee units was completed.
"(c) Whether or not the system started and functioned successfully: No problems or issues were identified with the performance of the Keowee Hydro Units in response to the emergency start.
"Therefore this condition is being reported for Oconee 1, 2, and 3 as an invalid actuation under 10 CFR 50.73 (a)(2)(iv)(A), which allows NRC notification via telephone per 10 CFR 50.73(a)(1).
"Corrective Actions:
"- Work was stopped on the Unit 3 Engineered Safety Features Actuation System Replacement Modification procedure;
"- Immediate investigation was conducted to determine the impact of the jumper activity as well as development of a recovery plan; and
"- The jumper was removed from links A-13 and A-14 and the Keowee units were shutdown."
The NRC Resident Inspector was informed.