Event Notification Report for July 13, 2002
U.S. Nuclear Regulatory Commission
Operations Center
EVENT REPORTS FOR
07/12/2002 - 07/13/2002
Power Reactor
Event Number: 39057
Facility: HARRIS
Region: 2 State: NC
Unit: [1] [] []
RX Type: [1] W-3-LP
NRC Notified By: FRANK JACKSON
HQ OPS Officer: FANGIE JONES
Region: 2 State: NC
Unit: [1] [] []
RX Type: [1] W-3-LP
NRC Notified By: FRANK JACKSON
HQ OPS Officer: FANGIE JONES
Notification Date: 07/13/2002
Notification Time: 02:57 [ET]
Event Date: 07/13/2002
Event Time: 01:10 [EDT]
Last Update Date: 07/13/2002
Notification Time: 02:57 [ET]
Event Date: 07/13/2002
Event Time: 01:10 [EDT]
Last Update Date: 07/13/2002
Emergency Class: NON EMERGENCY
10 CFR Section:
50.72(b)(2)(iv)(B) - RPS ACTUATION - CRITICAL 50.72(b)(3)(iv)(A) - VALID SPECIF SYS ACTUATION
10 CFR Section:
50.72(b)(2)(iv)(B) - RPS ACTUATION - CRITICAL 50.72(b)(3)(iv)(A) - VALID SPECIF SYS ACTUATION
Person (Organization):
ANNE BOLAND (R2)
ANNE BOLAND (R2)
| Unit | SCRAM Code | RX Crit | Initial PWR | Initial RX Mode | Current PWR | Current RX Mode |
|---|---|---|---|---|---|---|
| 1 | M/R | Y | 100 | Power Operation | 0 | Hot Standby |
MANUAL REACTOR TRIP DUE TO DEH MALFUNCTION
"Manual Rx trip due to DEH malfunction during initiation of downpower for scheduled valve testing. Automatic AFW actuation due to low S/G level following trip. 'C' S/G PORV remained open below lift setpoint. Valve shut
manually from MCB."
The licensee further noted that only the motor driven AFW pump started on a single low level signal as expected. The plant is stable in Mode 3, with normal feedwater and steam dumps to the condenser. An investigation will be completed prior to plant startup.
The licensee notified the NRC Resident Inspector.
"Manual Rx trip due to DEH malfunction during initiation of downpower for scheduled valve testing. Automatic AFW actuation due to low S/G level following trip. 'C' S/G PORV remained open below lift setpoint. Valve shut
manually from MCB."
The licensee further noted that only the motor driven AFW pump started on a single low level signal as expected. The plant is stable in Mode 3, with normal feedwater and steam dumps to the condenser. An investigation will be completed prior to plant startup.
The licensee notified the NRC Resident Inspector.
Power Reactor
Event Number: 39058
Facility: WATTS BAR
Region: 2 State: TN
Unit: [1] [] []
RX Type: [1] W-4-LP,[2] W-4-LP
NRC Notified By: JOHN RODEN
HQ OPS Officer: LEIGH TROCINE
Region: 2 State: TN
Unit: [1] [] []
RX Type: [1] W-4-LP,[2] W-4-LP
NRC Notified By: JOHN RODEN
HQ OPS Officer: LEIGH TROCINE
Notification Date: 07/13/2002
Notification Time: 18:42 [ET]
Event Date: 07/13/2002
Event Time: 16:22 [EDT]
Last Update Date: 07/13/2002
Notification Time: 18:42 [ET]
Event Date: 07/13/2002
Event Time: 16:22 [EDT]
Last Update Date: 07/13/2002
Emergency Class: NON EMERGENCY
10 CFR Section:
50.72(b)(2)(iv)(B) - RPS ACTUATION - CRITICAL 50.72(b)(3)(iv)(A) - VALID SPECIF SYS ACTUATION
10 CFR Section:
50.72(b)(2)(iv)(B) - RPS ACTUATION - CRITICAL 50.72(b)(3)(iv)(A) - VALID SPECIF SYS ACTUATION
Person (Organization):
ANNE BOLAND (R2)
ANNE BOLAND (R2)
| Unit | SCRAM Code | RX Crit | Initial PWR | Initial RX Mode | Current PWR | Current RX Mode |
|---|---|---|---|---|---|---|
| 1 | A/R | Y | 100 | Power Operation | 0 | Hot Standby |
AUTOMATIC TURBINE TRIP/REACTOR TRIP DUE TO ACTUATION OF A MAIN TRANSFORMER DIFFERENTIAL ELECTRICAL RELAY
The following text is a portion of a facsimile received from the licensee:
"At 1622 on July 13, 2002, the Unit 1 reactor tripped due to an automatic signal. All plant safety systems were in service at the time of the trip, and all systems responded as designed. All control rods inserted as required, and the Auxiliary Feedwater (AFW) System initiated as expected."
"The reactor trip resulted from a turbine trip signal that was generated as a result of a main transformer differential electrical relay actuation. The cause of the differential relay actuation is under investigation at this time."
"The plant is currently stable in Mode 3 and will remain in this mode until completion of the investigation."
The licensee stated that there were no related maintenance or surveillance activities ongoing at the time of the event but that there were heavy rains in the area earlier in the day. The licensee also stated that normal charging and makeup, pressurizer heaters and sprays, and the reactor coolant pumps are currently being utilized for primary system inventory, pressure and transport control. Secondary system steam is being dumped to the condenser, and the main feedwater pumps are supplying water to the steam generators. The auxiliary feedwater system has been secured, and containment parameters are normal.
The licensee notified the NRC resident inspector.
The following text is a portion of a facsimile received from the licensee:
"At 1622 on July 13, 2002, the Unit 1 reactor tripped due to an automatic signal. All plant safety systems were in service at the time of the trip, and all systems responded as designed. All control rods inserted as required, and the Auxiliary Feedwater (AFW) System initiated as expected."
"The reactor trip resulted from a turbine trip signal that was generated as a result of a main transformer differential electrical relay actuation. The cause of the differential relay actuation is under investigation at this time."
"The plant is currently stable in Mode 3 and will remain in this mode until completion of the investigation."
The licensee stated that there were no related maintenance or surveillance activities ongoing at the time of the event but that there were heavy rains in the area earlier in the day. The licensee also stated that normal charging and makeup, pressurizer heaters and sprays, and the reactor coolant pumps are currently being utilized for primary system inventory, pressure and transport control. Secondary system steam is being dumped to the condenser, and the main feedwater pumps are supplying water to the steam generators. The auxiliary feedwater system has been secured, and containment parameters are normal.
The licensee notified the NRC resident inspector.