Event Notification Report for December 13, 2001
U.S. Nuclear Regulatory Commission
Operations Center
Event Reports For
12/12/2001 - 12/13/2001
** EVENT NUMBERS **
38558 38559
.
+------------------------------------------------------------------------------+
|Power Reactor |Event Number: 38558 |
+------------------------------------------------------------------------------+
+------------------------------------------------------------------------------+
| FACILITY: CALLAWAY REGION: 4 |NOTIFICATION DATE: 12/12/2001|
| UNIT: [1] [] [] STATE: MO |NOTIFICATION TIME: 11:32[EST]|
| RXTYPE: [1] W-4-LP |EVENT DATE: 12/12/2001|
+------------------------------------------------+EVENT TIME: 08:20[CST]|
| NRC NOTIFIED BY: STEVEN AUFDEMBERGE |LAST UPDATE DATE: 12/12/2001|
| HQ OPS OFFICER: BOB STRANSKY +-----------------------------+
+------------------------------------------------+PERSON ORGANIZATION |
|EMERGENCY CLASS: NON EMERGENCY |GREG PICK R4 |
|10 CFR SECTION: | |
|APRE 50.72(b)(2)(xi) OFFSITE NOTIFICATION | |
| | |
| | |
| | |
+-----+----------+-------+--------+-----------------+--------+-----------------+
|UNIT |SCRAM CODE|RX CRIT|INIT PWR| INIT RX MODE |CURR PWR| CURR RX MODE
|
+-----+----------+-------+--------+-----------------+--------+-----------------+
|1 N Y 100 Power Operation |100 Power Operation |
| | |
| | |
+------------------------------------------------------------------------------+
EVENT TEXT
+------------------------------------------------------------------------------+
| OFFSITE NOTIFICATION REGARDING NPDES PERMIT VIOLATION |
| |
| "This 4-hour call is being made to the NRC based on the requirements of |
| 10CFR50.72(b)(2)(xi). A written report was submitted to the Missouri |
| Department of Natural Resources concerning the discharge of plant processed |
| water to a storm water runoff outfall inconsistent with the terms and |
| conditions of Callaway Plant's NPDES permit. This written report was |
| submitted on December 12, 2001, and addresses a discharge of water from the |
| plant circulating water system that occurred on December 7, 2001. |
| |
| "On December 12, 2001, the Missouri Department of Natural Resources (Mo. |
| DNR) was notified that a discharge of plant processed water from our |
| circulating water system, occurred. This event occurred on December 7, 2001 |
| and was the result of a minor leak that developed at a caulked construction |
| joint in our cooling tower basin. |
| |
| "This event resulted in a notification to the Mo. DNR on 12/12/01. It was |
| concluded this event is reportable per 10CFR50.72(b)(2)(xi) since it |
| represents a notification to a government agency relating to the protection |
| of the environment." |
| |
| The NRC Resident Inspector was notified of this event by the licensee. |
+------------------------------------------------------------------------------+
.
+------------------------------------------------------------------------------+
|Power Reactor |Event Number: 38559 |
+------------------------------------------------------------------------------+
+------------------------------------------------------------------------------+
| FACILITY: RIVER BEND REGION: 4 |NOTIFICATION DATE: 12/12/2001|
| UNIT: [1] [] [] STATE: LA |NOTIFICATION TIME: 15:58[EST]|
| RXTYPE: [1] GE-6 |EVENT DATE: 10/15/2001|
+------------------------------------------------+EVENT TIME: 00:01[CST]|
| NRC NOTIFIED BY: DAVID CLYMER |LAST UPDATE DATE: 12/12/2001|
| HQ OPS OFFICER: LEIGH TROCINE +-----------------------------+
+------------------------------------------------+PERSON ORGANIZATION |
|EMERGENCY CLASS: NON EMERGENCY |GREG PICK R4 |
|10 CFR SECTION: | |
|AINV 50.73(a)(1) INVALID SPECIF SYSTEM A| |
| | |
| | |
| | |
+-----+----------+-------+--------+-----------------+--------+-----------------+
|UNIT |SCRAM CODE|RX CRIT|INIT PWR| INIT RX MODE |CURR PWR| CURR RX MODE
|
+-----+----------+-------+--------+-----------------+--------+-----------------+
|1 N Y 80 Power Operation |80 Power Operation |
| | |
| | |
+------------------------------------------------------------------------------+
EVENT TEXT
+------------------------------------------------------------------------------+
| ISOLATION OF DIVISION I CONTAINMENT ISOLATION VALVES DUE TO THE
UNEXPECTED |
| TRIP OF THE FEEDER BREAKER FOR A NON-SAFETY 480-VOLT AC SWITCHGEAR
(60-Day |
| Report) |
| |
| The following text is a portion of a facsimile received from the licensee: |
| |
| "On October 15, 2001, at approximately 12:01 a.m., with the plant at |
| approximately 80% power, an isolation of Division I containment isolation |
| valves occurred. This event was caused by the unexpected trip of the feeder |
| breaker for one of the plant's non-safety 480-volt AC switchgears. In |
| addition, five manual breakers on the same switchgear opened. This |
| deenergized the normal power supply to the Division I reactor protection |
| system (RPS), which caused the actuation of Division I containment isolation |
| valves. This event is being reported in accordance with the 60-day |
| telephone notification provision in 10CFR50.73(a)(2)(iv)(A) as an invalid |
| general containment isolation signal." |
| |
| "Division I containment isolation valves automatically closed, and the |
| Division I annulus mixing and standby gas treatment systems received an |
| automatic start signal. Consistent with plant design, isolation of the |
| annulus pressure control system subsequently caused the Division II annulus |
| mixing and standby gas treatment systems to start. However, the Division II |
| annulus mixing fan breaker tripped open after receiving a close signal. |
| Both divisions of the fuel building charcoal filter trains started. The |
| Division I containment atmosphere hydrogen analyzer automatically started." |
| |
| "After an initial assessment, operators implemented abnormal operating |
| procedures and restored systems in containment to their normal alignment. |
| Plant operation was not interrupted. Except for the trip of the Division II |
| annulus mixing fan, all plant systems responded as designed to the event. |
| The fan trip is being addressed within the stations corrective action |
| program." |
| |
| "The investigation of the spurious breaker trips is still in progress. |
| Tests completed thus far have not determined the cause of the trip, and |
| switchgear inspections performed during a brief plant outage in the interim |
| found no hardware deficiencies. The Division I RPS system remains powered |
| from its alternate source, which will prevent its loss should the switchgear |
| again be de-energized. The switchgear has been instrumented in order to |
| collect transient data in the event the trips recur." |
| |
| The licensee notified the NRC resident inspector. |
+------------------------------------------------------------------------------+
.
Page Last Reviewed/Updated Wednesday, March 24, 2021
Page Last Reviewed/Updated Wednesday, March 24, 2021