Event Notification Report for February 05, 2000
U.S. Nuclear Regulatory Commission
Operations Center
EVENT REPORTS FOR
02/04/2000 - 02/05/2000
EVENT NUMBERS
36664
!!!!! THIS EVENT HAS BEEN RETRACTED !!!!!
!!!!! THIS EVENT HAS BEEN RETRACTED !!!!!
Power Reactor
Event Number: 36664
Facility: ARKANSAS NUCLEAR
Region: 4 State: AR
Unit: [1] [] []
RX Type: [1] B&W-L-LP,[2] CE
NRC Notified By: TOM MOSBY
HQ OPS Officer: JOHN MacKINNON
Region: 4 State: AR
Unit: [1] [] []
RX Type: [1] B&W-L-LP,[2] CE
NRC Notified By: TOM MOSBY
HQ OPS Officer: JOHN MacKINNON
Notification Date: 02/05/2000
Notification Time: 15:06 [ET]
Event Date: 02/05/2000
Event Time: 13:06 [CST]
Last Update Date: 02/06/2000
Notification Time: 15:06 [ET]
Event Date: 02/05/2000
Event Time: 13:06 [CST]
Last Update Date: 02/06/2000
Emergency Class: NON EMERGENCY
10 CFR Section:
50.72(b)(1)(i)(A) - PLANT S/D REQD BY TS 50.72(b)(2)(i) - DEG/UNANALYZED COND
10 CFR Section:
50.72(b)(1)(i)(A) - PLANT S/D REQD BY TS 50.72(b)(2)(i) - DEG/UNANALYZED COND
Person (Organization):
CLAUDE JOHNSON (R4)
STUART RICHARDS (NRR)
JOSEPH GIITTER (IRO)
CLAUDE JOHNSON (R4)
STUART RICHARDS (NRR)
JOSEPH GIITTER (IRO)
| Unit | SCRAM Code | RX Crit | Initial PWR | Initial RX Mode | Current PWR | Current RX Mode |
|---|---|---|---|---|---|---|
| 1 | N | N | 0 | Hot Shutdown | 0 | Hot Shutdown |
TECHNICAL SPECIFICATION 3.0.3 ENTERED AT 1306 CST DUE TO BOTH TRAINS OF LOW PRESSURE INJECTION/RESIDUAL HEAT REMOVAL (LPI/RHR) DECLARED INOPERABLE.
"At 1306 on 02/05/00, both Low Pressure Injection/Decay Heat Removal Pumps (P-34A and B) were declared inoperable and Technical Specification 3.0.3 was entered. The pumps were declared inoperable after the inboard pump bearing temperatures exceeded their alarm setpoint after being placed in service for decay heat removal for normal cooldown.
"Unit 1 was taken offline at 0010 on 02/05/00 for scheduled maintenance. The unit was in the process of cooling down at the time Tech Spec 3.0.3 was entered. Decay heat removal is being maintained with the use of the operable "B" Reactor Coolant System Loop."
Low Pressure Injection pump "A" was placed in service at 1206 CST and a high temperature alarm for the inboard pump bearing was received. Later Low Pressure Injection pump "B" was placed in service and a high temperature alarm for the pump inboard bearing was also received at which time Tech Spec 3.0.3 was entered. The outboard bearing temperatures for both Low Pressure Injection pumps were below their high temperature alarm setpoint. The Low Pressure Injection pumps inboard and outboard bearing are cooled by the Service Water system. Reactor Coolant System pressure is currently 262 psig and plant temperature is 263 degrees F. The licensee said that as far as he knew the Service Water system was properly aligned for cooling both the inboard and outboard bearings of the Low Pressure Injection pumps. Reactor Coolant System Loop "A" is also fully operable if needed. All other Emergency Core Cooling Systems are operable. The licensee is investigating the cause of the high inboard bearing temperatures.
The NRC Resident Inspector will notified of this event by the licensee.
* * * UPDATE AT 1730 HOURS ON 02/05/00 BY MOSBY TAKEN BY MACKINNON * * *
LICENSEE UPDATED EVENT AS A 4 HOUR CALL UNDER 10 CFR 50.72 (b)(2)(I) - DEGRADED WHILE SHUTDOWN.
"When P-34A was initially placed in service, the inboard bearing temperature reached the alarm setpoint of 160 degrees F at which time the pump was secured. Currently, P-34A is aligned to recirculate the Borated Water Storage Tank (BWST) and is in operation with the temperature of the pump inboard bearing steady at 84.5 degrees F. Engineering, Operation and Predictive Maintenance are currently involved with the continued testing of the pump. The testing and subsequent operability assessment will be concluded prior to placing the pump in service for decay heat removal." R4DO (C. Johnson) notified.
The NRC Resident Inspector was notified of this event update by the licensee.
* * * UPDATE AT 1040 ON 02/06/00 BY SCHEIDE TAKEN BY WEAVER * * *
The licensee has retracted this event notification based on the following discussion. Technical Specifications require LPI to be operable when three conditions are exist. 1. Fuel in the reactor vessel. 2. Reactor coolant temperature above 200 degrees F and 3. Primary system pressure > 300 psig. A subsequent review of the event verified that RCS pressure was at 240 psig at the time of the event. Therefore, LPI was not required to be operable and 3.0.3 was not applicable. Conditions for decay heat removal were satisfied since both reactor coolant loops and associated OTSGs remained operable.
The licensee will notify the NRC resident inspector. The operations center notified the RDO (Johnson).
"At 1306 on 02/05/00, both Low Pressure Injection/Decay Heat Removal Pumps (P-34A and B) were declared inoperable and Technical Specification 3.0.3 was entered. The pumps were declared inoperable after the inboard pump bearing temperatures exceeded their alarm setpoint after being placed in service for decay heat removal for normal cooldown.
"Unit 1 was taken offline at 0010 on 02/05/00 for scheduled maintenance. The unit was in the process of cooling down at the time Tech Spec 3.0.3 was entered. Decay heat removal is being maintained with the use of the operable "B" Reactor Coolant System Loop."
Low Pressure Injection pump "A" was placed in service at 1206 CST and a high temperature alarm for the inboard pump bearing was received. Later Low Pressure Injection pump "B" was placed in service and a high temperature alarm for the pump inboard bearing was also received at which time Tech Spec 3.0.3 was entered. The outboard bearing temperatures for both Low Pressure Injection pumps were below their high temperature alarm setpoint. The Low Pressure Injection pumps inboard and outboard bearing are cooled by the Service Water system. Reactor Coolant System pressure is currently 262 psig and plant temperature is 263 degrees F. The licensee said that as far as he knew the Service Water system was properly aligned for cooling both the inboard and outboard bearings of the Low Pressure Injection pumps. Reactor Coolant System Loop "A" is also fully operable if needed. All other Emergency Core Cooling Systems are operable. The licensee is investigating the cause of the high inboard bearing temperatures.
The NRC Resident Inspector will notified of this event by the licensee.
* * * UPDATE AT 1730 HOURS ON 02/05/00 BY MOSBY TAKEN BY MACKINNON * * *
LICENSEE UPDATED EVENT AS A 4 HOUR CALL UNDER 10 CFR 50.72 (b)(2)(I) - DEGRADED WHILE SHUTDOWN.
"When P-34A was initially placed in service, the inboard bearing temperature reached the alarm setpoint of 160 degrees F at which time the pump was secured. Currently, P-34A is aligned to recirculate the Borated Water Storage Tank (BWST) and is in operation with the temperature of the pump inboard bearing steady at 84.5 degrees F. Engineering, Operation and Predictive Maintenance are currently involved with the continued testing of the pump. The testing and subsequent operability assessment will be concluded prior to placing the pump in service for decay heat removal." R4DO (C. Johnson) notified.
The NRC Resident Inspector was notified of this event update by the licensee.
* * * UPDATE AT 1040 ON 02/06/00 BY SCHEIDE TAKEN BY WEAVER * * *
The licensee has retracted this event notification based on the following discussion. Technical Specifications require LPI to be operable when three conditions are exist. 1. Fuel in the reactor vessel. 2. Reactor coolant temperature above 200 degrees F and 3. Primary system pressure > 300 psig. A subsequent review of the event verified that RCS pressure was at 240 psig at the time of the event. Therefore, LPI was not required to be operable and 3.0.3 was not applicable. Conditions for decay heat removal were satisfied since both reactor coolant loops and associated OTSGs remained operable.
The licensee will notify the NRC resident inspector. The operations center notified the RDO (Johnson).