Event Notification Report for October 01, 2007
U.S. Nuclear Regulatory Commission
Operations Center
EVENT REPORTS FOR
09/30/2007 - 10/01/2007
Power Reactor
Event Number: 43680
Facility: GRAND GULF
Region: 4 State: MS
Unit: [1] [] []
RX Type: [1] GE-6
NRC Notified By: HARDY FARRIS
HQ OPS Officer: JEFF ROTTON
Region: 4 State: MS
Unit: [1] [] []
RX Type: [1] GE-6
NRC Notified By: HARDY FARRIS
HQ OPS Officer: JEFF ROTTON
Notification Date: 10/02/2007
Notification Time: 04:28 [ET]
Event Date: 10/01/2007
Event Time: 22:20 [CDT]
Last Update Date: 10/03/2007
Notification Time: 04:28 [ET]
Event Date: 10/01/2007
Event Time: 22:20 [CDT]
Last Update Date: 10/03/2007
Emergency Class: NON EMERGENCY
10 CFR Section:
50.72(b)(3)(xiii) - LOSS COMM/ASMT/RESPONSE
10 CFR Section:
50.72(b)(3)(xiii) - LOSS COMM/ASMT/RESPONSE
Person (Organization):
REBECCA NEASE (R4)
REBECCA NEASE (R4)
| Unit | SCRAM Code | RX Crit | Initial PWR | Initial RX Mode | Current PWR | Current RX Mode |
|---|---|---|---|---|---|---|
| 1 | N | Y | 100 | Power Operation | 100 | Power Operation |
LOSS OF EXHAUST VENTILATION STACK FLOW AND ACCIDENT RADIATION MONITORS DUE TO PLANT DATA MULTIPLEXER FAILURE
"On 10/01/2007 the failure of a plant data multiplexer (MUX) resulted in the loss of Control Room indication of all plant building exhaust ventilation stack flows and accident radiation monitors. The stack flows and accident radiation monitors are normally accessed by the plants Emergency Response Organization offsite dose calculation application but cannot be accessed at this time. Alternate means of offsite dose projections are available. The duration of the plant data MUX outage is currently unknown. Follow-up notification will be made after restoration of the plant data MUX."
The cause of the failure is being investigated.
The licensee notified the NRC Resident Inspector.
* * * UPDATE PROVIDED BY HARDY FERRIS TO JASON KOZAL ON 10/03/07 AT 0214 EDT * * *
The licensee reports that the plant data multiplexer (MUX) has been returned to service. A faulty off-gas building channel (Offgas / Radwaste Building AXM/SPING/FMIS) was the cause of the MUX failure. The off-gas channel remains out of service.
The licensee notified the NRC Resident Inspector. R4DO (Nease) notified.
"On 10/01/2007 the failure of a plant data multiplexer (MUX) resulted in the loss of Control Room indication of all plant building exhaust ventilation stack flows and accident radiation monitors. The stack flows and accident radiation monitors are normally accessed by the plants Emergency Response Organization offsite dose calculation application but cannot be accessed at this time. Alternate means of offsite dose projections are available. The duration of the plant data MUX outage is currently unknown. Follow-up notification will be made after restoration of the plant data MUX."
The cause of the failure is being investigated.
The licensee notified the NRC Resident Inspector.
* * * UPDATE PROVIDED BY HARDY FERRIS TO JASON KOZAL ON 10/03/07 AT 0214 EDT * * *
The licensee reports that the plant data multiplexer (MUX) has been returned to service. A faulty off-gas building channel (Offgas / Radwaste Building AXM/SPING/FMIS) was the cause of the MUX failure. The off-gas channel remains out of service.
The licensee notified the NRC Resident Inspector. R4DO (Nease) notified.
Power Reactor
Event Number: 43678
Facility: FT CALHOUN
Region: 4 State: NE
Unit: [1] [] []
RX Type: [1] CE
NRC Notified By: ERICK MATZKE
HQ OPS Officer: MARK ABRAMOVITZ
Region: 4 State: NE
Unit: [1] [] []
RX Type: [1] CE
NRC Notified By: ERICK MATZKE
HQ OPS Officer: MARK ABRAMOVITZ
Notification Date: 10/01/2007
Notification Time: 14:17 [ET]
Event Date: 10/01/2007
Event Time: 13:15 [CDT]
Last Update Date: 10/30/2007
Notification Time: 14:17 [ET]
Event Date: 10/01/2007
Event Time: 13:15 [CDT]
Last Update Date: 10/30/2007
Emergency Class: NON EMERGENCY
10 CFR Section:
10 CFR Section:
Person (Organization):
REBECCA NEASE (R4)
TOM KARDARAS (NSIR)
REBECCA NEASE (R4)
TOM KARDARAS (NSIR)
| Unit | SCRAM Code | RX Crit | Initial PWR | Initial RX Mode | Current PWR | Current RX Mode |
|---|---|---|---|---|---|---|
| 1 | N | Y | 100 | Power Operation | 100 | Power Operation |
REPLACING THE EMERGENCY RESPONSE FACILITY COMPUTER SYSTEM
"The Plant Process computer system (Emergency Response Facility Computer System) will be taken out of service for approximate 3 week period starting October 1, 2007, to implement a planned modification. The current ERFCS is being replaced and a computer outage is required for the installation of the new ERFCS. During this time period Emergency Response Data System (ERDS) and Safety Parameter Display System (SPDS) functions will not be available. However, the Qualified Safety Parameter Display System (QSPDS) will still be operable in the Control Room. This notification is being made to inform the NRC that the ERDS will be unavailable until this modification is complete. The operation of the plant systems will not be affected due to this planned action. ERDS and SPDS parameters will be monitored by control board indications. All contingency actions required by ERFCS-3, ERFCS Maintenance Outage Plant Mode 1, have been taken. Meteorological data to support the Emergency Response Organization (ERO) will be obtained from the local national weather service (if needed) as described in our Radiological Response Plan. A follow up notification, to the NRC will be given once ERDS and SPDS are returned to service. The NRC Resident Inspector has been informed."
* * * UPDATE FROM KEVIN BOSTON TO J. KNOKE AT 1820 ON 10/30/07 * * *
The licensee completed planned modifications and fully restored the Plant Process computer system (Emergency Response Facility Computer System).
The licensee notified the NRC Resident Inspector. Notified R4DO (Powers) , T. Kardaras (email).
"The Plant Process computer system (Emergency Response Facility Computer System) will be taken out of service for approximate 3 week period starting October 1, 2007, to implement a planned modification. The current ERFCS is being replaced and a computer outage is required for the installation of the new ERFCS. During this time period Emergency Response Data System (ERDS) and Safety Parameter Display System (SPDS) functions will not be available. However, the Qualified Safety Parameter Display System (QSPDS) will still be operable in the Control Room. This notification is being made to inform the NRC that the ERDS will be unavailable until this modification is complete. The operation of the plant systems will not be affected due to this planned action. ERDS and SPDS parameters will be monitored by control board indications. All contingency actions required by ERFCS-3, ERFCS Maintenance Outage Plant Mode 1, have been taken. Meteorological data to support the Emergency Response Organization (ERO) will be obtained from the local national weather service (if needed) as described in our Radiological Response Plan. A follow up notification, to the NRC will be given once ERDS and SPDS are returned to service. The NRC Resident Inspector has been informed."
* * * UPDATE FROM KEVIN BOSTON TO J. KNOKE AT 1820 ON 10/30/07 * * *
The licensee completed planned modifications and fully restored the Plant Process computer system (Emergency Response Facility Computer System).
The licensee notified the NRC Resident Inspector. Notified R4DO (Powers) , T. Kardaras (email).