Event Notification Report for May 29, 2011
U.S. Nuclear Regulatory Commission
Operations Center
EVENT REPORTS FOR
05/28/2011 - 05/29/2011
Power Reactor
Event Number: 46902
Facility: WATTS BAR
Region: 2 State: TN
Unit: [1] [] []
RX Type: [1] W-4-LP,[2] W-4-LP
NRC Notified By: STUART SWITZER
HQ OPS Officer: DONALD NORWOOD
Region: 2 State: TN
Unit: [1] [] []
RX Type: [1] W-4-LP,[2] W-4-LP
NRC Notified By: STUART SWITZER
HQ OPS Officer: DONALD NORWOOD
Notification Date: 05/29/2011
Notification Time: 04:25 [ET]
Event Date: 05/29/2011
Event Time: 01:55 [EDT]
Last Update Date: 05/29/2011
Notification Time: 04:25 [ET]
Event Date: 05/29/2011
Event Time: 01:55 [EDT]
Last Update Date: 05/29/2011
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):
KATHLEEN O'DONOHUE (R2DO)
KATHLEEN O'DONOHUE (R2DO)
| 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 REACTOR TRIP DUE TO TURBINE TRIP
"At 0155 EDT, the Watts Bar Unit 1 reactor tripped from 100% power due to a turbine trip above P-9 (reactor trip on turbine trip permissive). The cause of the turbine trip is under investigation at this time. All systems functioned as designed with the exception of Pressurizer Backup Heaters which failed to energize on lowering Pressurizer pressure.
"The unit is stable in Mode 3 with Auxiliary Feedwater supplying the Steam Generators. The electrical system is in normal shutdown alignment with all Emergency Diesel Generators available in standby. There are no abnormal radiological conditions at this time."
The reason the Pressurizer Backup Heaters failed to energize is unknown at this time. All control rods fully inserted. No relief valves or safety valves lifted. The licensee notified the NRC Resident Inspector.
"At 0155 EDT, the Watts Bar Unit 1 reactor tripped from 100% power due to a turbine trip above P-9 (reactor trip on turbine trip permissive). The cause of the turbine trip is under investigation at this time. All systems functioned as designed with the exception of Pressurizer Backup Heaters which failed to energize on lowering Pressurizer pressure.
"The unit is stable in Mode 3 with Auxiliary Feedwater supplying the Steam Generators. The electrical system is in normal shutdown alignment with all Emergency Diesel Generators available in standby. There are no abnormal radiological conditions at this time."
The reason the Pressurizer Backup Heaters failed to energize is unknown at this time. All control rods fully inserted. No relief valves or safety valves lifted. The licensee notified the NRC Resident Inspector.
Power Reactor
Event Number: 46903
Facility: LIMERICK
Region: 1 State: PA
Unit: [] [2] []
RX Type: [1] GE-4,[2] GE-4
NRC Notified By: MARK ARNOSKY
HQ OPS Officer: CHARLES TEAL
Region: 1 State: PA
Unit: [] [2] []
RX Type: [1] GE-4,[2] GE-4
NRC Notified By: MARK ARNOSKY
HQ OPS Officer: CHARLES TEAL
Notification Date: 05/29/2011
Notification Time: 07:10 [ET]
Event Date: 05/29/2011
Event Time: 05:02 [EDT]
Last Update Date: 05/29/2011
Notification Time: 07:10 [ET]
Event Date: 05/29/2011
Event Time: 05:02 [EDT]
Last Update Date: 05/29/2011
Emergency Class: NON EMERGENCY
10 CFR Section:
50.72(b)(2)(iv)(B) - RPS ACTUATION - CRITICAL
10 CFR Section:
50.72(b)(2)(iv)(B) - RPS ACTUATION - CRITICAL
Person (Organization):
GLENN DENTEL (R1DO)
GLENN DENTEL (R1DO)
| Unit | SCRAM Code | RX Crit | Initial PWR | Initial RX Mode | Current PWR | Current RX Mode |
|---|---|---|---|---|---|---|
| 2 | A/R | Y | 75 | Power Operation | 0 | Hot Shutdown |
AUTOMATIC REACTOR TRIP DUE TO LOW PRESSURE IN EHC SYSTEM
"Limerick Unit 2 automatically scrammed from 75% power while restoring EHC (Electro Hydraulic Control) fluid to number 3 Turbine Control Valve following maintenance work. Preliminary indications as to the cause of the scram indicate a low pressure condition in the EHC system resulting in an RPS actuation.
"All control rods inserted as required.
"No ECCS or RCIC initiations occurred.
"No primary or secondary containment isolations occurred.
"The plant is currently in Hot Shutdown maintaining normal reactor water level with feedwater."
Decay heat is being removed via the bypass valves to the condenser. The plant is in a normal shutdown electrical lineup. There was no impact on Unit 1.
The NRC Resident Inspector has been informed. The licensee will inform the Pennsylvania Emergency Management Agency, Montgomery, Burke, and Chester counties.
"Limerick Unit 2 automatically scrammed from 75% power while restoring EHC (Electro Hydraulic Control) fluid to number 3 Turbine Control Valve following maintenance work. Preliminary indications as to the cause of the scram indicate a low pressure condition in the EHC system resulting in an RPS actuation.
"All control rods inserted as required.
"No ECCS or RCIC initiations occurred.
"No primary or secondary containment isolations occurred.
"The plant is currently in Hot Shutdown maintaining normal reactor water level with feedwater."
Decay heat is being removed via the bypass valves to the condenser. The plant is in a normal shutdown electrical lineup. There was no impact on Unit 1.
The NRC Resident Inspector has been informed. The licensee will inform the Pennsylvania Emergency Management Agency, Montgomery, Burke, and Chester counties.
Power Reactor
Event Number: 46904
Facility: SAN ONOFRE
Region: 4 State: CA
Unit: [] [2] [3]
RX Type: [1] W-3-LP,[2] CE,[3] CE
NRC Notified By: DOUGLAS FOOTE
HQ OPS Officer: JOHN KNOKE
Region: 4 State: CA
Unit: [] [2] [3]
RX Type: [1] W-3-LP,[2] CE,[3] CE
NRC Notified By: DOUGLAS FOOTE
HQ OPS Officer: JOHN KNOKE
Notification Date: 05/29/2011
Notification Time: 15:01 [ET]
Event Date: 05/29/2011
Event Time: 09:57 [PDT]
Last Update Date: 05/29/2011
Notification Time: 15:01 [ET]
Event Date: 05/29/2011
Event Time: 09:57 [PDT]
Last Update Date: 05/29/2011
Emergency Class: NON EMERGENCY
10 CFR Section:
50.72(b)(2)(xi) - OFFSITE NOTIFICATION
10 CFR Section:
50.72(b)(2)(xi) - OFFSITE NOTIFICATION
Person (Organization):
MARK HAIRE (R4DO)
MARK HAIRE (R4DO)
| 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 | 100 | Power Operation | 100 | Power Operation |
OFFSITE NOTIFICATION DUE TO AN ON-SITE SULFURIC ACID SPILL
"This notification is for San Onofre Units 2 and 3 and is being made in accordance with 10CFR50.72(b)(2)(xi) to report that on 5/29/2011 at 0957 PDT Government agencies were notified of a sulfuric acid spill.
"On 5/28/2011 [at] 1440 PDT, during resin bed regeneration operations at the High Flow Makeup Demineralizer (HFMUD), a sulfuric acid transfer was in progress. When process piping was pressurized, a valve on the discharge side of the process pump experienced a diaphragm failure causing a body to bonnet leak. Operators secured the acid transfer. All the sulfuric acid was contained within the bermed area of the HFMUD.
"Hazardous material teams have contained and cleaned up the spill. Area is secured until repairs can be implemented. All HFMUD operations have been stopped until repairs are completed.
"On 5/29/2011 at 0926, the hazardous material team determined that this event was reportable to government agencies. The following reports were made:
"[At] 0957 PDT San Diego Department of Enviornmental Health [was] called with [a] voice message left.
"[At] 0959 PDT California Emergency Management Agency [was] called. Report number 11-3246.
"[At] 1008 PDT National Response Center [was] called. Report number 977718."
The licensee has notified the NRC Resident Inspector,
"This notification is for San Onofre Units 2 and 3 and is being made in accordance with 10CFR50.72(b)(2)(xi) to report that on 5/29/2011 at 0957 PDT Government agencies were notified of a sulfuric acid spill.
"On 5/28/2011 [at] 1440 PDT, during resin bed regeneration operations at the High Flow Makeup Demineralizer (HFMUD), a sulfuric acid transfer was in progress. When process piping was pressurized, a valve on the discharge side of the process pump experienced a diaphragm failure causing a body to bonnet leak. Operators secured the acid transfer. All the sulfuric acid was contained within the bermed area of the HFMUD.
"Hazardous material teams have contained and cleaned up the spill. Area is secured until repairs can be implemented. All HFMUD operations have been stopped until repairs are completed.
"On 5/29/2011 at 0926, the hazardous material team determined that this event was reportable to government agencies. The following reports were made:
"[At] 0957 PDT San Diego Department of Enviornmental Health [was] called with [a] voice message left.
"[At] 0959 PDT California Emergency Management Agency [was] called. Report number 11-3246.
"[At] 1008 PDT National Response Center [was] called. Report number 977718."
The licensee has notified the NRC Resident Inspector,