Event Notification Report for January 24, 2002
U.S. Nuclear Regulatory Commission
Operations Center
EVENT REPORTS FOR
01/23/2002 - 01/24/2002
EVENT NUMBERS
38648
!!!!! THIS EVENT HAS BEEN RETRACTED !!!!!
!!!!! THIS EVENT HAS BEEN RETRACTED !!!!!
Power Reactor
Event Number: 38648
Facility: SUSQUEHANNA
Region: 1 State: PA
Unit: [1] [2] []
RX Type: [1] GE-4,[2] GE-4
NRC Notified By: GORDON ROBINSON
HQ OPS Officer: BOB STRANSKY
Region: 1 State: PA
Unit: [1] [2] []
RX Type: [1] GE-4,[2] GE-4
NRC Notified By: GORDON ROBINSON
HQ OPS Officer: BOB STRANSKY
Notification Date: 01/24/2002
Notification Time: 18:20 [ET]
Event Date: 01/24/2002
Event Time: 11:00 [EST]
Last Update Date: 03/07/2002
Notification Time: 18:20 [ET]
Event Date: 01/24/2002
Event Time: 11:00 [EST]
Last Update Date: 03/07/2002
Emergency Class: NON EMERGENCY
10 CFR Section:
50.72(b)(3)(v)(A) - POT UNABLE TO SAFE SD 50.72(b)(3)(v)(B) - POT RHR INOP 50.72(b)(3)(v)(D) - ACCIDENT MITIGATION
10 CFR Section:
50.72(b)(3)(v)(A) - POT UNABLE TO SAFE SD 50.72(b)(3)(v)(B) - POT RHR INOP 50.72(b)(3)(v)(D) - ACCIDENT MITIGATION
Person (Organization):
PETE ESELGROTH (R1)
PETE ESELGROTH (R1)
| Unit | SCRAM Code | RX Crit | Initial PWR | Initial RX Mode | Current PWR | Current RX Mode |
|---|---|---|---|---|---|---|
| 1 | N | Y | 93 | Power Operation | 93 | Power Operation |
| 2 | N | Y | 100 | Power Operation | 100 | Power Operation |
FAILURE OF REACTOR VESSEL WATER LEVEL SWITCH
"At 11:00 EST, during performance of the 24 Month Calibration of Reactor Vessel Water Level Channels on Unit 2, Level Indicating Switch LIS-B21-2N031C would not properly relock following calibration. As a result of this, the switch was declared inoperable. A review of the design drawings revealed that this switch provides inputs (through relays) that affect the reset logic for the 'A' and 'C' ESW pumps and the trips for the 'A' Reactor and Turbine Building Chillers on a Low Reactor Water Level signal. Without this switch functioning properly, the listed ESW pump start timers would not reset as required and the listed chillers would not trip as required on the Low Reactor Water signal. The Tech Spec Basis for this instrumentation indicates that without these features, both offsite circuits and the associated Diesel Generators would be inoperable. Given this, both offsite sources and two (2) Diesel Generators were declared inoperable. SSES safety analysis requires three Operable Diesel Generators to safely shutdown the plant. Given this, this condition requires an 8 hour ENS notification in accordance with 10CFR50.72(b)(3)(v).
"As a result of this condition, LCO 3.0.3 was entered on both Unit 1 and Unit 2 (in addition to other applicable LCO's). As of 13:00 on 01/24/02, the switch was repaired and declared operable (and the associated LCO's were cleared).
"There were no Diesel Generators, ECCS, or Tech Spec Electrical Distribution systems out of service at the time of the event."
The NRC resident inspector has been informed of this notification by the licensee.
* * * EVENT RETRACTED AT 1743 EST 3/7/02 BY GRANT FERNSLER TO GERRY WAIG * * *
"A subsequent evaluation of the inoperable level switch determined that the impact, under worst case conditions, would have resulted in only one inoperable Emergency Diesel Generator. Both offsite power sources and the remaining three aligned Emergency Diesel Generators would remain operable. This is within the design basis of the plant and therefore the condition would not have resulted in a complete loss of a safety function. Based on that evaluation, ENS notification EN#38648 is retracted." The NRC Resident has been notified of the retraction by the licensee.
Notified the R1DO (Mohamed Shanbaky).
"At 11:00 EST, during performance of the 24 Month Calibration of Reactor Vessel Water Level Channels on Unit 2, Level Indicating Switch LIS-B21-2N031C would not properly relock following calibration. As a result of this, the switch was declared inoperable. A review of the design drawings revealed that this switch provides inputs (through relays) that affect the reset logic for the 'A' and 'C' ESW pumps and the trips for the 'A' Reactor and Turbine Building Chillers on a Low Reactor Water Level signal. Without this switch functioning properly, the listed ESW pump start timers would not reset as required and the listed chillers would not trip as required on the Low Reactor Water signal. The Tech Spec Basis for this instrumentation indicates that without these features, both offsite circuits and the associated Diesel Generators would be inoperable. Given this, both offsite sources and two (2) Diesel Generators were declared inoperable. SSES safety analysis requires three Operable Diesel Generators to safely shutdown the plant. Given this, this condition requires an 8 hour ENS notification in accordance with 10CFR50.72(b)(3)(v).
"As a result of this condition, LCO 3.0.3 was entered on both Unit 1 and Unit 2 (in addition to other applicable LCO's). As of 13:00 on 01/24/02, the switch was repaired and declared operable (and the associated LCO's were cleared).
"There were no Diesel Generators, ECCS, or Tech Spec Electrical Distribution systems out of service at the time of the event."
The NRC resident inspector has been informed of this notification by the licensee.
* * * EVENT RETRACTED AT 1743 EST 3/7/02 BY GRANT FERNSLER TO GERRY WAIG * * *
"A subsequent evaluation of the inoperable level switch determined that the impact, under worst case conditions, would have resulted in only one inoperable Emergency Diesel Generator. Both offsite power sources and the remaining three aligned Emergency Diesel Generators would remain operable. This is within the design basis of the plant and therefore the condition would not have resulted in a complete loss of a safety function. Based on that evaluation, ENS notification EN#38648 is retracted." The NRC Resident has been notified of the retraction by the licensee.
Notified the R1DO (Mohamed Shanbaky).