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 THIS EVENT HAS BEEN RETRACTED. THIS EVENT HAS BEEN RETRACTED !!!!!!!
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|Power Reactor |Event Number: 37138 |
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| 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 |
| | |
| | |
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EVENT TEXT
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| 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). |
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+------------------------------------------------------------------------------+
|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. |
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Page Last Reviewed/Updated Thursday, March 25, 2021
Page Last Reviewed/Updated Thursday, March 25, 2021