Event Notification Report for December 21, 2002
U.S. Nuclear Regulatory Commission
Operations Center
EVENT REPORTS FOR
12/20/2002 - 12/21/2002
EVENT NUMBERS
39466
Power Reactor
Event Number: 39466
Facility: PEACH BOTTOM
Region: 1 State: PA
Unit: [2] [] []
RX Type: [2] GE-4,[3] GE-4
NRC Notified By: DAN FORRY
HQ OPS Officer: MIKE NORRIS
Region: 1 State: PA
Unit: [2] [] []
RX Type: [2] GE-4,[3] GE-4
NRC Notified By: DAN FORRY
HQ OPS Officer: MIKE NORRIS
Notification Date: 12/22/2002
Notification Time: 00:18 [ET]
Event Date: 12/21/2002
Event Time: 20:35 [EST]
Last Update Date: 12/22/2002
Notification Time: 00:18 [ET]
Event Date: 12/21/2002
Event Time: 20:35 [EST]
Last Update Date: 12/22/2002
Emergency Class: NON EMERGENCY
10 CFR Section:
50.72(b)(2)(iv)(B) - RPS ACTUATION - CRITICAL 50.72(b)(2)(iv)(A) - ECCS INJECTION 50.72(b)(3)(iv)(A) - VALID SPECIF SYS ACTUATION
10 CFR Section:
50.72(b)(2)(iv)(B) - RPS ACTUATION - CRITICAL 50.72(b)(2)(iv)(A) - ECCS INJECTION 50.72(b)(3)(iv)(A) - VALID SPECIF SYS ACTUATION
Person (Organization):
J. BRADLEY FEWELL (R1)
DAVID MATTHEWS (NRR)
J. BRADLEY FEWELL (R1)
DAVID MATTHEWS (NRR)
| Unit | SCRAM Code | RX Crit | Initial PWR | Initial RX Mode | Current PWR | Current RX Mode |
|---|---|---|---|---|---|---|
| 2 | A/R | Y | 100 | Power Operation | 0 | Hot Shutdown |
AUTOMATIC REACTOR SCRAM AFTER EHC FAILURE
At 2035, an EHC failure occurred that caused multiple bypass valves to open. Reactor pressure dropped resulting in a Group 1 isolation (closure of MSIV's) which caused a reactor scram. Lowest pressure was approximately 850#. Level dropped through Lo Level (1"), resulting in Group 2/3 PCIS isolation. Level continued to Lo Lo Level (-48"), resulting in ECCS actuation and injection (HPCI & RCIC). ARI also initiated resulting in trip of both Recirculation pumps. Plant is stabilized and preceding to cold shutdown.
The Licensee has notified the NRC Resident Inspector.
The plant currently has MSIV's shut due to 3 Bypass valves open and are maintaining pressure control with HPCI & RCIC.
At 2035, an EHC failure occurred that caused multiple bypass valves to open. Reactor pressure dropped resulting in a Group 1 isolation (closure of MSIV's) which caused a reactor scram. Lowest pressure was approximately 850#. Level dropped through Lo Level (1"), resulting in Group 2/3 PCIS isolation. Level continued to Lo Lo Level (-48"), resulting in ECCS actuation and injection (HPCI & RCIC). ARI also initiated resulting in trip of both Recirculation pumps. Plant is stabilized and preceding to cold shutdown.
The Licensee has notified the NRC Resident Inspector.
The plant currently has MSIV's shut due to 3 Bypass valves open and are maintaining pressure control with HPCI & RCIC.