Event Notification Report for December 29, 2000
U.S. Nuclear Regulatory Commission
Operations Center
Event Reports For
12/28/2000 - 12/29/2000
** EVENT NUMBERS **
37637
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|Power Reactor |Event Number: 37637 |
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| FACILITY: COOPER REGION: 4 |NOTIFICATION DATE: 12/28/2000|
| UNIT: [1] [] [] STATE: NE |NOTIFICATION TIME: 12:21[EST]|
| RXTYPE: [1] GE-4 |EVENT DATE: 12/28/2000|
+------------------------------------------------+EVENT TIME: 07:41[CST]|
| NRC NOTIFIED BY: STEVE WHEELER |LAST UPDATE DATE: 12/28/2000|
| HQ OPS OFFICER: BOB STRANSKY +-----------------------------+
+------------------------------------------------+PERSON ORGANIZATION |
|EMERGENCY CLASS: N/A |CHARLES MARSCHALL R4 |
|10 CFR SECTION: | |
|AESF 50.72(b)(2)(ii) ESF ACTUATION | |
| | |
| | |
| | |
+-----+----------+-------+--------+-----------------+--------+-----------------+
|UNIT |SCRAM CODE|RX CRIT|INIT PWR| INIT RX MODE |CURR PWR| CURR RX MODE |
+-----+----------+-------+--------+-----------------+--------+-----------------+
|1 N Y 100 Power Operation |100 Power Operation |
| | |
| | |
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EVENT TEXT
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| CONTROL BUILDING VENTILATION ISOLATION |
| |
| "At 0741 CST the Control Building Emergency Filtration System automatically |
| initiated on a Control Building Intake Gas High Activity alarm. The cause of |
| the Gas High Activity alarm is under investigation." |
| |
| The NRC resident inspector has been informed of this event by the licensee. |
| |
| * * * UPDATE ON 12/29/00, 0024 ET BY MYERS TAKEN BY MACKINNON * * * |
| |
| During the day, trouble shooting was performed to determine the source of |
| the actuation at 0741 CST today. Surveillance Procedure 6.PRM.317, CONTROL |
| ROOM AIR SAMPLING SYSTEM ELECTRONIC CALIBRATION, was performed, and all |
| indications were within specification. A source check of the gaseous |
| channel was also performed per Instrument Operating Procedure 4.17, and the |
| response of the monitor was normal. Air sampling was conducted, and no |
| indications of abnormal radiation were identified. The Control Room |
| Emergency Filtration System was returned to the standby lineup. |
| |
| At 1933, the Control Room Emergency Filtration System again initiated on a |
| high gaseous activity signal. All equipment functioned as required. The |
| Control Building Ventilation Radiation Monitor has been declared inoperable, |
| and the Control Room Emergency Filtration System remains in service, aligned |
| in the accident mode. |
| |
| Note: The Control Building Ventilation Radiation Monitor consists of three |
| channels, with two required to be operable. The Iodine channel is also |
| presently inoperable. The actuation logic requires only one channel of the |
| three to initiate Control Room Isolation and start the Emergency Booster |
| (pressurization) fan. |
| |
| Noble gas sample was taken at 2142 CST. All readings were normal. NRC |
| R4DO (C. Marschall) notified. |
| |
| The NRC Resident Inspector will be notified of this event by the licensee. |
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