Daily Events Report U.S. Nuclear Regulatory Commission Operations Center Event Reports For 01/18/2000 - 01/19/2000 +----------------------------------------------------+ |Power Reactor |Event Number: 36602 + | FACILITY: SEQUOYAH REGION: 2 |NOTIFICATION DATE: 01/18/2000| | UNIT: [] [2] [] STATE: TN |NOTIFICATION TIME: 11:40[EST]| | RXTYPE: [1] W-4-LP,[2] W-4-LP |EVENT DATE: 01/18/2000| +----------------------+EVENT TIME: 10:51[EST]| | NRC NOTIFIED BY: DAVID PORTER |LAST | UPDATE DATE: 01/18/2000| | HQ OPS OFFICER: FANGIE JONES +----------+ +----------------------+PERSON ORGANIZATION | |EMERGENCY CLASS: N/A |ROBERT HAAG R2 | |10 CFR SECTION: |JIM LYONS NRR | |ACCS 50.72(b)(1)(iv) ECCS INJECTION |CHARLES MILLER IRO | |ARPS 50.72(b)(2)(ii) RPS ACTUATION | | |AESF 50.72(b)(2)(ii) ESF ACTUATION | | | | | +-----+------+-------+-------+-------+-------+-------+ |UNIT |SCRAM CODE|RX CRIT|INIT PWR| INIT RX MODE |CURR PWR| CURR RX MODE | +-----+------+-------+-------+-------+-------+-------+ | | | |2 A/R Y 100 Power Operation |0 Hot Standby | | | | +----------------------------------------------------+ EVENT TEXT +----------------------------------------------------+ | INADVERTENT SAFETY INJECTION DUE TO ELECTRICAL FAULT | AND REACTOR TRIP | | | | Technicians were performing a modification to the | vital inverter 2-IV when a | safety injection signal | was generated due to an electrical problem on vital | | | instrument bus 2-IV. When the technicians were | lifting a lead on the sync | | signal input to the inverter 2-IV in accordance with | the modification, an | | inadvertent safety injection signal was generated. | When the safety | injection actuated, only | Train 'A' safety injection occurred. The cause of | | |the reactor trip is unknown at this time though | it is expected with a safety | injection. The | operators followed the emergency procedures and | started the | | Train 'B' safety injection and residual heat removal | pumps; the train 'B' | | centrifugal charging pump started automatically | (reason unknown and being | | investigated). The 2A-A motor-driven auxiliary | feedwater pump tripped for | unknown reasons. The | #2 steam generator atmospheric relief valve | controller | appears to have failed, which required | operators to take manual control and | close the | relief valve. An event investigation has been | initiated, and all | | problems will be answered before the unit is | restarted. | | | | The plant is currently stable in Mode 3 with heat | removal via the | | atmospheric reliefs and feedwater via the 2B-B | motor-driven and | | turbine-driven auxiliary feedwater pumps. All rods | fully inserted. The | safety injection signal | was from the 'Low Steam Generator Pressure' section, | | and the main steam isolation valves closed | automatically. The plant has no | | steam generator tube leaks. | | | | The licensee notified the NRC Resident Inspector.

-- Barb B (LeeeeeeB@webtv.net), January 19, 2000

Answers

Does anyone know how this issue was resolved?

-- J. Michael Rowland (rowley@looknfeel.com), January 26, 2000.