Event Notification Report for November 17, 2002
U.S. Nuclear Regulatory Commission
Operations Center
EVENT REPORTS FOR
11/16/2002 - 11/17/2002
EVENT NUMBERS
39381
!!!!! THIS EVENT HAS BEEN RETRACTED !!!!!
!!!!! THIS EVENT HAS BEEN RETRACTED !!!!!
Power Reactor
Event Number: 39381
Facility: HATCH
Region: 2 State: GA
Unit: [1] [] []
RX Type: [1] GE-4,[2] GE-4
NRC Notified By: RICHARD STONE
HQ OPS Officer: STEVE SANDIN
Region: 2 State: GA
Unit: [1] [] []
RX Type: [1] GE-4,[2] GE-4
NRC Notified By: RICHARD STONE
HQ OPS Officer: STEVE SANDIN
Notification Date: 11/17/2002
Notification Time: 15:38 [ET]
Event Date: 11/17/2002
Event Time: 13:06 [EST]
Last Update Date: 12/13/2002
Notification Time: 15:38 [ET]
Event Date: 11/17/2002
Event Time: 13:06 [EST]
Last Update Date: 12/13/2002
Emergency Class: NON EMERGENCY
10 CFR Section:
50.72(b)(3)(v)(D) - ACCIDENT MITIGATION
10 CFR Section:
50.72(b)(3)(v)(D) - ACCIDENT MITIGATION
Person (Organization):
LEONARD WERT (R2)
LEONARD WERT (R2)
| Unit | SCRAM Code | RX Crit | Initial PWR | Initial RX Mode | Current PWR | Current RX Mode |
|---|---|---|---|---|---|---|
| 1 | N | Y | 100 | Power Operation | 100 | Power Operation |
HPCI DECLARED INOPERABLE DURING QUARTERLY SURVEILLANCE TESTING
"Unit 1 High Pressure Coolant Injection (HPCI) flow controller indicates 512 GPM with system in standby. Found when aligning system for surveillance. Cannot assure system will achieve rated flow automatically. HPCI is a single train system."
HPCI was declared inoperable placing Unit 1 in a 14-day LCO A/S 3.5.1. The licensee intends to troubleshoot the problem including a fill/vent of the applicable flow transmitter. The licensee will inform the NRC resident inspector.
* * * RETRACTION ON 12/13/02 AT 0958 EST FROM HARRY RUSSELL TO GERRY WAIG * * *
The investigation of the problem noted in Report 39381 reported 11/17/2002 was determined to be setpoint drift of transmitter 1E41N008 and not an inoperable controller. Because this transmitter receives an input of differential pressure and the milliamp output is converted to flow using a square root function the amount of error in the flow rate measurement is not linear throughout the span of the transmitter. The plant has confirmed that the "as found" setpoint drift of this single flow measuring device would still have allowed the affected flow controller to perform its safety function and control flow negligibly lower than the design flowrate (4220 versus 4250 gpm), thereby continuing to allow HPCI to fulfill its safety function. It did not involve a failure of the flow measuring device and would therefore not be indicative of a generic failure problem with similar flow measuring devices on other systems. The HPCI system was operable in its "as found" condition. Based on the guidance in NUREG 1022, Revision 2, this setpoint drift of 1E41N008 is not reportable.
Notified R2DO (Mike Ernstes).
"Unit 1 High Pressure Coolant Injection (HPCI) flow controller indicates 512 GPM with system in standby. Found when aligning system for surveillance. Cannot assure system will achieve rated flow automatically. HPCI is a single train system."
HPCI was declared inoperable placing Unit 1 in a 14-day LCO A/S 3.5.1. The licensee intends to troubleshoot the problem including a fill/vent of the applicable flow transmitter. The licensee will inform the NRC resident inspector.
* * * RETRACTION ON 12/13/02 AT 0958 EST FROM HARRY RUSSELL TO GERRY WAIG * * *
The investigation of the problem noted in Report 39381 reported 11/17/2002 was determined to be setpoint drift of transmitter 1E41N008 and not an inoperable controller. Because this transmitter receives an input of differential pressure and the milliamp output is converted to flow using a square root function the amount of error in the flow rate measurement is not linear throughout the span of the transmitter. The plant has confirmed that the "as found" setpoint drift of this single flow measuring device would still have allowed the affected flow controller to perform its safety function and control flow negligibly lower than the design flowrate (4220 versus 4250 gpm), thereby continuing to allow HPCI to fulfill its safety function. It did not involve a failure of the flow measuring device and would therefore not be indicative of a generic failure problem with similar flow measuring devices on other systems. The HPCI system was operable in its "as found" condition. Based on the guidance in NUREG 1022, Revision 2, this setpoint drift of 1E41N008 is not reportable.
Notified R2DO (Mike Ernstes).