Event Notification Report for July 10, 2008
U.S. Nuclear Regulatory Commission
Operations Center
EVENT REPORTS FOR
07/09/2008 - 07/10/2008
EVENT NUMBERS
44342
Power Reactor
Event Number: 44342
Facility: SUSQUEHANNA
Region: 1 State: PA
Unit: [1] [2] []
RX Type: [1] GE-4,[2] GE-4
NRC Notified By: MARTIN LICHTNER
HQ OPS Officer: HOWIE CROUCH
Region: 1 State: PA
Unit: [1] [2] []
RX Type: [1] GE-4,[2] GE-4
NRC Notified By: MARTIN LICHTNER
HQ OPS Officer: HOWIE CROUCH
Notification Date: 07/10/2008
Notification Time: 16:18 [ET]
Event Date: 07/10/2008
Event Time: 15:38 [EDT]
Last Update Date: 07/10/2008
Notification Time: 16:18 [ET]
Event Date: 07/10/2008
Event Time: 15:38 [EDT]
Last Update Date: 07/10/2008
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):
ART BURRITT (R1)
ART BURRITT (R1)
| Unit | SCRAM Code | RX Crit | Initial PWR | Initial RX Mode | Current PWR | Current RX Mode |
|---|---|---|---|---|---|---|
| 1 | N | Y | 94 | Power Operation | 93 | Power Operation |
| 2 | N | Y | 100 | Power Operation | 100 | Power Operation |
LOSS OF EMERGENCY ASSESSMENT CAPABILITIES DUE TO PLANT COMPUTER FAILURE
"At 0738 hours on 07/10/08, reactor operators noticed that information on displays of the Plant Integrated Computer System were not periodically updating. Investigation by computer maintenance personnel was initiated. Reactor power was reduced 1 % to ensure compliance with license limits. As of 1538 hours, reliable operation of the computer was not restored.
"This computer system also performs the Safety Parameter Display System (SPDS) and Emergency Response Data System (ERDS) functions. Redundant, normal control room indications are still available to the operators.
"Since the Unit 1 SPDS and ERDS computer system were not reliable for greater than 8 hours, this is considered a Loss of Emergency Assessment Capability and therefore reportable under 10CFR50.72(b)(3)(xiii)."
Prior to this event, plant personnel were performing plant computer modifications. Compensatory measures are in place to provide emergency assessment data should an event occurs that requires it.
The licensee has notified the NRC Resident Inspector.
* * * UPDATE FROM JIM HUFFORD TO JOHN KNOKE AT2052 EDT ON 07/10/08 * * *
"This is a follow-up courtesy notification to EN# 44342. As of 2017 on 07/10/08, Unit 1 ERDS and PICSY were fully restored to normal operation. Unit 1 reactor power was returned to full power of 94.4% as of 2042 on 7/10/08."
The licensee has notified the NRC Resident Inspector. Notified R1DO (Art Burritt)
"At 0738 hours on 07/10/08, reactor operators noticed that information on displays of the Plant Integrated Computer System were not periodically updating. Investigation by computer maintenance personnel was initiated. Reactor power was reduced 1 % to ensure compliance with license limits. As of 1538 hours, reliable operation of the computer was not restored.
"This computer system also performs the Safety Parameter Display System (SPDS) and Emergency Response Data System (ERDS) functions. Redundant, normal control room indications are still available to the operators.
"Since the Unit 1 SPDS and ERDS computer system were not reliable for greater than 8 hours, this is considered a Loss of Emergency Assessment Capability and therefore reportable under 10CFR50.72(b)(3)(xiii)."
Prior to this event, plant personnel were performing plant computer modifications. Compensatory measures are in place to provide emergency assessment data should an event occurs that requires it.
The licensee has notified the NRC Resident Inspector.
* * * UPDATE FROM JIM HUFFORD TO JOHN KNOKE AT2052 EDT ON 07/10/08 * * *
"This is a follow-up courtesy notification to EN# 44342. As of 2017 on 07/10/08, Unit 1 ERDS and PICSY were fully restored to normal operation. Unit 1 reactor power was returned to full power of 94.4% as of 2042 on 7/10/08."
The licensee has notified the NRC Resident Inspector. Notified R1DO (Art Burritt)