United States Nuclear Regulatory Commission - Protecting People and the Environment
Home > NRC Library > Document Collections > Reports Associated With Events > Event Notification Reports > 2000

Event Notification Report for July 14, 2000

                    U.S. Nuclear Regulatory Commission
                              Operations Center

                              Event Reports For
                           07/13/2000 - 07/14/2000

                              ** EVENT NUMBERS **

37138  37165  

!!!!!!!!! THIS EVENT HAS BEEN RETRACTED. THIS EVENT HAS BEEN RETRACTED  !!!!!!!
+------------------------------------------------------------------------------+
|Power Reactor                                    |Event Number:   37138       |
+------------------------------------------------------------------------------+
+------------------------------------------------------------------------------+
| FACILITY: VERMONT YANKEE           REGION:  1  |NOTIFICATION DATE: 06/30/2000|
|    UNIT:  [1] [] []                 STATE:  VT |NOTIFICATION TIME: 15:43[EDT]|
|   RXTYPE: [1] GE-4                             |EVENT DATE:        06/13/2000|
+------------------------------------------------+EVENT TIME:        14:00[EDT]|
| NRC NOTIFIED BY:  MARK MAGNUSON                |LAST UPDATE DATE:  07/13/2000|
|  HQ OPS OFFICER:  BOB STRANSKY                 +-----------------------------+
+------------------------------------------------+PERSON          ORGANIZATION |
|EMERGENCY CLASS:          N/A                   |SCOTT MORRIS         R1      |
|10 CFR SECTION:                                 |                             |
|AOUT 50.72(b)(1)(ii)(B)  OUTSIDE DESIGN BASIS   |                             |
|                                                |                             |
|                                                |                             |
|                                                |                             |
+-----+----------+-------+--------+-----------------+--------+-----------------+
|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                                   
+------------------------------------------------------------------------------+
| UNIT OUTSIDE OF DESIGN BASIS                                                 |
|                                                                              |
| "On 6/13/00, Vermont Yankee (VY) discovered that a turbine building to       |
| radwaste hallway door had been breached open for maintenance activities      |
| without proper engineering review. The condition has been corrected.         |
|                                                                              |
| "The door serves as a high energy line break (HELB) barrier such that a HELB |
| in the turbine building would not propagate into the radwaste hallway and    |
| cause subsequent failure of masonry block wall between the hallway and the   |
| main plant switchgear rooms. Redundant equipment in the switchgear rooms is  |
| not qualified for operation in the environment postulated by the TB HELB.    |
|                                                                              |
| "VY review has determined that a compensatory measure to close the door in   |
| the event of a HELB that had been established at the time of the maintenance |
| activities would not have provided adequate protection against the           |
| postulated HELB.                                                             |
|                                                                              |
| "Based on the above, this condition is reportable in accordance with 10 CFR  |
| 50.72(b)(1)(ii)(B) as a condition found during operation that results in a   |
| condition that is outside the design basis of the plant."                    |
|                                                                              |
| The NRC resident inspector has been informed of this event by the licensee.  |
|                                                                              |
| * * * RETRACTED AT 1831 EDT ON 7/13/00 BY MARK MAGNUSON TO FANGIE JONES * *  |
| *                                                                            |
|                                                                              |
| "On June 30, 2000 Vermont Yankee reported that a planned compensatory        |
| measure associated with a breached door would not have been adequate to      |
| protect plant equipment in the unlikely event of a high energy line break in |
| the turbine building. The condition was reported under 10 CFR                |
| 50.72(b)(1)(ii)(B) as a condition that was outside the design basis. The     |
| associated NRC event number is 37138.                                        |
|                                                                              |
| "Vermont Yankee has since determined that the door had not been tied open    |
| for a period of time greater than the 24 hours allowed by VY technical       |
| specifications for equipment that may have been affected by the high energy  |
| line break. In addition, VY assessment has concluded that redundant          |
| equipment would not have been challenged and that the overall risk of the    |
| short term event was minimal.                                                |
|                                                                              |
| "Based on this information, the 50.72 ENS notification is retracted."        |
|                                                                              |
| The licensee notified the NRC Resident Inspector.  The NRC Operations        |
| Officer notified the R1DO (Richard Conte).                                   |
+------------------------------------------------------------------------------+

+------------------------------------------------------------------------------+
|Power Reactor                                    |Event Number:   37165       |
+------------------------------------------------------------------------------+
+------------------------------------------------------------------------------+
| FACILITY: CALVERT CLIFFS           REGION:  1  |NOTIFICATION DATE: 07/13/2000|
|    UNIT:  [1] [2] []                STATE:  MD |NOTIFICATION TIME: 16:43[EDT]|
|   RXTYPE: [1] CE,[2] CE                        |EVENT DATE:        07/13/2000|
+------------------------------------------------+EVENT TIME:        16:00[EDT]|
| NRC NOTIFIED BY:  TIM RITI                     |LAST UPDATE DATE:  07/13/2000|
|  HQ OPS OFFICER:  FANGIE JONES                 +-----------------------------+
+------------------------------------------------+PERSON          ORGANIZATION |
|EMERGENCY CLASS:          N/A                   |RICHARD CONTE        R1      |
|10 CFR SECTION:                                 |                             |
|AIND 50.72(b)(2)(iii)(D) ACCIDENT MITIGATION    |                             |
|                                                |                             |
|                                                |                             |
|                                                |                             |
+-----+----------+-------+--------+-----------------+--------+-----------------+
|UNIT |SCRAM CODE|RX CRIT|INIT PWR|   INIT RX MODE  |CURR PWR|  CURR RX MODE   |
+-----+----------+-------+--------+-----------------+--------+-----------------+
|1     N          Y       100      Power Operation  |100      Power Operation  |
|2     N          Y       100      Power Operation  |100      Power Operation  |
|                                                   |                          |
+------------------------------------------------------------------------------+
                                   EVENT TEXT                                   
+------------------------------------------------------------------------------+
| CONTROL ROOM RADIATION SIGNAL DISCOVERED NOT TO FUNCTION AS DESIGNED DURING  |
| LOSS OF OFFSITE POWER                                                        |
|                                                                              |
| The licensee discovered that the control room radiation signal would not     |
| function as designed during the loss of offsite power.  They have taken      |
| manual action per technical specifications to insure proper action during    |
| the loss of offsite power.  A written LER will be submitted within 30 days.  |
|                                                                              |
| The licensee notified the NRC Resident Inspector.                            |
+------------------------------------------------------------------------------+