U.S. Nuclear Regulatory Commission
                             Operations Center
 
                             Event Reports For
                            02/13/96 - 02/14/96
 
                             ** EVENT NUMBERS **
 
29974  

+----------------------------------+              +-----------------------+     
|POWER REACTOR                     |              |EVENT NUMBER:  29974   |     
+----------------------------------+              +-----------------------+     
+------------------------------------------------+-----------------------------+
|FACILITY: MAINE YANKEE               REGION:  1 |NOTIFICATION DATE: 02/14/96  |
|UNIT:     [1] [ ] [ ]                 STATE: ME |NOTIFICATION TIME: 00:09 [ET]|
|RX TYPE: [1] CE                                 |EVENT DATE:        02/13/96  |
+------------------------------------------------+EVENT TIME:        22:28[EST]|
|NRC NOTIFIED BY: PETE EBERT                     |LAST UPDATE DATE:  02/14/96  |
|HQ OPS OFFICER:  LEIGH TROCINE                  +-----------------------------+
+------------------------------------------------+       NOTIFICATIONS         |
|EMERGENCY CLASS: NOT APPLICABLE                 +-----------------------------+
|10 CFR SECTION:                                 |RONALD BELLAMY        RDO    |
|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   |
+-----+----------+-------+--------+-----------------+--------+-----------------+
|  1  |   A/R        Y       90     POWER OPERATION |     0    HOT STANDBY     |
|     |                                             |                          |
|     |                                             |                          |
+-----+---------------------------------------------+--------------------------+

                                   EVENT TEXT
+------------------------------------------------------------------------------+
| AUTOMATIC REACTOR TRIP ON HIGH STEAM GENERATOR LEVEL DUE TO FAILURE OF A     |
| MAIN FEEDWATER REGULATING VALVE                                              |
|                                                                              |
| AT 22:28 ON FEBRUARY 13, 1996, THE NUMBER 3 MAIN FEEDWATER REGULATING VALVE  |
| FAILED OPEN WITH THE CONTROL SYSTEM IN AUTOMATIC.  STEAM GENERATOR WATER     |
| LEVEL INCREASED TO APPROXIMATELY 88% (NARROW RANGE), AND THE UNIT            |
| AUTOMATICALLY TRIPPED ON HIGH FEEDWATER LEVEL.  ALL RODS FULLY INSERTED,     |
| AND ALL SYSTEMS FUNCTIONED AS REQUIRED.  THE MAIN FEEDWATER PUMPS            |
| AUTOMATICALLY TRIPPED, AND EMERGENCY FEEDWATER AUTOMATICALLY INITIATED AS    |
| DESIGNED.  FOLLOWING THE REACTOR PROTECTION SYSTEM ACTUATION, STEAM          |
| GENERATOR LEVEL DECREASED TO 20% AND WAS SUBSEQUENTLY RECOVERED TO NORMAL    |
| LEVEL (APPROXIMATELY 60%).  THE MAIN STEAM SUPPLY VALVES REMAINED OPEN       |
| DURING THIS TRANSIENT.                                                       |
|                                                                              |
| THE UNIT IS CURRENTLY STABLE IN HOT STANDBY, AND THE LICENSEE PLANS TO       |
| PLACE THE UNIT IN HOT SHUTDOWN.  OPERATORS ARE UTILIZING NORMAL CHARGING     |
| AND MAKEUP, PRESSURIZER HEATERS AND SPRAYS, AND REACTOR COOLANT PUMPS FOR    |
| PRIMARY INVENTORY, PRESSURE, AND TRANSPORT CONTROL.  EMERGENCY FEEDWATER IS  |
| BEING SUPPLIED TO THE STEAM GENERATORS, AND SECONDARY STEAM IS BEING DUMPED  |
| TO THE CONDENSER.  THE LICENSEE IS CURRENTLY INVESTIGATING THE CAUSE OF THE  |
| FEEDWATER REGULATING VALVE FAILURE.                                          |
|                                                                              |
| THE LICENSEE NOTIFIED THE NRC RESIDENT INSPECTOR AND THE STATE AND MAY       |
| ISSUE A PRESS RELEASE.                                                       |
+------------------------------------------------------------------------------+