Event Notification Report for September 29, 2000
U.S. Nuclear Regulatory Commission
Operations Center
Event Reports For
09/28/2000 - 09/29/2000
** EVENT NUMBERS **
37386 37387 37388
+------------------------------------------------------------------------------+
|Power Reactor |Event Number: 37386 |
+------------------------------------------------------------------------------+
+------------------------------------------------------------------------------+
| FACILITY: COOK REGION: 3 |NOTIFICATION DATE: 09/28/2000|
| UNIT: [1] [2] [] STATE: MI |NOTIFICATION TIME: 01:23[EDT]|
| RXTYPE: [1] W-4-LP,[2] W-4-LP |EVENT DATE: 09/28/2000|
+------------------------------------------------+EVENT TIME: 01:21[EDT]|
| NRC NOTIFIED BY: STEVE CHERBA |LAST UPDATE DATE: 09/28/2000|
| HQ OPS OFFICER: BOB STRANSKY +-----------------------------+
+------------------------------------------------+PERSON ORGANIZATION |
|EMERGENCY CLASS: N/A |BRENT CLAYTON R3 |
|10 CFR SECTION: | |
|AARC 50.72(b)(1)(v) OTHER ASMT/COMM INOP | |
| | |
| | |
| | |
+-----+----------+-------+--------+-----------------+--------+-----------------+
|UNIT |SCRAM CODE|RX CRIT|INIT PWR| INIT RX MODE |CURR PWR| CURR RX MODE |
+-----+----------+-------+--------+-----------------+--------+-----------------+
|1 N N 0 Refueling |0 Refueling |
|2 N Y 100 Power Operation |100 Power Operation |
| | |
+------------------------------------------------------------------------------+
EVENT TEXT
+------------------------------------------------------------------------------+
| ELECTRICAL BUS OUTAGE WILL AFFECT TSC VENTILATION SYSTEM |
| |
| "This event notification is for planned maintenance on Cook Unit 1's |
| electrical buses that remove power from a portion of the TSC ventilation |
| system. Contingencies are established to restore power to the TSC |
| ventilation fan (if needed) to support Emergency Plan execution. The fan |
| that will be unavailable boosts airflow through the TSC ventilation charcoal |
| clean-up filter subsystem. Ventilation flow will still pass through this |
| filter without the booster fan, but TSC pressure will not be boosted to |
| limit infiltration. Use of this fan is dependent on radiological conditions, |
| if radiological conditions warrant its use, and it is not available, the TSC |
| will relocate to the Unit 2 Control Room in accordance with plant |
| procedures. Reporting this event is consistent with NUREG-1022, Rev 1 |
| criteria for reporting loss of ERFs. |
| |
| "No adverse consequences are expected from this outage. The TSC ventilation |
| booster fan is expected to be unavailable for 48 hours, starting at 0121 |
| hours on 9-28-2000. Contingencies have been planned to restore power to the |
| booster fan in 8 to 10 hours if needed. Follow-up notification will be made |
| when the TSC is again fully available. The NRC Senior Site Resident |
| Inspector has been informed of this planned evolution." |
+------------------------------------------------------------------------------+
+------------------------------------------------------------------------------+
|Power Reactor |Event Number: 37387 |
+------------------------------------------------------------------------------+
+------------------------------------------------------------------------------+
| FACILITY: MILLSTONE REGION: 1 |NOTIFICATION DATE: 09/28/2000|
| UNIT: [] [] [3] STATE: CT |NOTIFICATION TIME: 18:43[EDT]|
| RXTYPE: [1] GE-3,[2] CE,[3] W-4-LP |EVENT DATE: 09/28/2000|
+------------------------------------------------+EVENT TIME: 18:35[EDT]|
| NRC NOTIFIED BY: ROBERT SMITH |LAST UPDATE DATE: 09/28/2000|
| HQ OPS OFFICER: DOUG WEAVER +-----------------------------+
+------------------------------------------------+PERSON ORGANIZATION |
|EMERGENCY CLASS: N/A |FRANK COSTELLO 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 |
+-----+----------+-------+--------+-----------------+--------+-----------------+
| | |
| | |
|3 N Y 100 Power Operation |100 Power Operation |
+------------------------------------------------------------------------------+
EVENT TEXT
+------------------------------------------------------------------------------+
| OUTSIDE DESIGN BASIS - PUMP POWER SUPPLY DOES NOT MEET SAFE SHUTDOWN |
| REQUIREMENTS |
| |
| On September 28, 2000 at approximately 1835, it was determined that the |
| power cable routing for the 'B' charging pump is not in accordance with the |
| assumptions in the Millstone Unit 3 Fire Safe Shutdown Analysis. This |
| condition could have resulted in the inability to maintain RCP seal cooling |
| in the event of a design basis fire. This condition is historical in |
| nature. In accordance with the Millstone Unit 3 Technical Requirements |
| Manual, a fire watch has been established in the affected area as a |
| compensatory measure until a corrective action plan can be developed and |
| implemented. All other fire protection features in the affected areas are |
| operable. |
| |
| The cable is supposed to be run inside of a fire curtain, but instead was |
| run outside of this curtain. |
| |
| The licensee notified the NRC resident inspector. |
+------------------------------------------------------------------------------+
+------------------------------------------------------------------------------+
|Power Reactor |Event Number: 37388 |
+------------------------------------------------------------------------------+
+------------------------------------------------------------------------------+
| FACILITY: PEACH BOTTOM REGION: 1 |NOTIFICATION DATE: 09/28/2000|
| UNIT: [2] [3] [] STATE: PA |NOTIFICATION TIME: 19:26[EDT]|
| RXTYPE: [2] GE-4,[3] GE-4 |EVENT DATE: 09/28/2000|
+------------------------------------------------+EVENT TIME: 17:30[EDT]|
| NRC NOTIFIED BY: JAMES KOVALCHICK |LAST UPDATE DATE: 09/28/2000|
| HQ OPS OFFICER: DOUG WEAVER +-----------------------------+
+------------------------------------------------+PERSON ORGANIZATION |
|EMERGENCY CLASS: N/A |FRANK COSTELLO R1 |
|10 CFR SECTION: | |
|AINB 50.72(b)(2)(iii)(B) POT RHR INOP | |
|AIND 50.72(b)(2)(iii)(D) ACCIDENT MITIGATION | |
| | |
| | |
+-----+----------+-------+--------+-----------------+--------+-----------------+
|UNIT |SCRAM CODE|RX CRIT|INIT PWR| INIT RX MODE |CURR PWR| CURR RX MODE |
+-----+----------+-------+--------+-----------------+--------+-----------------+
|2 N N 0 Refueling |0 Refueling |
|3 N Y 100 Power Operation |100 Power Operation |
| | |
+------------------------------------------------------------------------------+
EVENT TEXT
+------------------------------------------------------------------------------+
| POTENTIAL LOSS OF RHR AND ACCIDENT MITIGATION CAPABILITY |
| |
| ON 09/28/00 AT 04:30 HRS. SURVEILLANCE TESTING SHOWED THAT A CHECK VALVE |
| FAILED TO ISOLATE FLOW BETWEEN THE EMERGENCY SERVICE WATER (ESW) SYSTEM AND |
| THE NON-SAFETY |
| RELATED UNIT 2 SERVICE WATER (SW) SYSTEM. FAILURE TO PREVENT FLOW FROM THE |
| EMERGENCY SERVICE WATER SYSTEM TO THE SERVICE WATER SYSTEM COULD RENDER BOTH |
| ESW SUBSYSTEMS INOPERABLE. |
| |
| AT 05:58 ON 09/28/00, A MANUALLY OPERATED BLOCK VALVE WAS CLOSED BETWEEN THE |
| SYSTEMS TO MAINTAIN INTEGRITY OF THE ESW SUBSYSTEMS. THIS ACTION ENSURES |
| THAT BOTH ESW |
| SUBSYSTEMS ARE MAINTAINED OPERABLE. |
| |
| FURTHER EVALUATION AND TESTING WAS PERFORMED AND AT 17:30 HRS. ON 09/28/00, |
| THE CONCLUSION WAS REACHED THAT THIS CONDITION COULD ALONE HAVE PREVENTED |
| THE FULFILLMENT OF THE ESW SYSTEM SAFETY FUNCTION. |
| |
| The licensee notified the NRC resident inspector. |
+------------------------------------------------------------------------------+
Page Last Reviewed/Updated Wednesday, March 24, 2021
Page Last Reviewed/Updated Wednesday, March 24, 2021