U.S. Nuclear Regulatory Commission Operations Center Event Reports For 06/13/96 - 06/14/96 ** EVENT NUMBERS ** 30627 30628 30629 30630 +----------------------------------+ +-----------------------+ |POWER REACTOR | |EVENT NUMBER: 30627 | +----------------------------------+ +-----------------------+ +------------------------------------------------+-----------------------------+ |FACILITY: CATAWBA REGION: 2 |NOTIFICATION DATE: 06/13/96 | |UNIT: [1] [ ] [ ] STATE: SC |NOTIFICATION TIME: 02:31 [ET]| |RX TYPE: [1] W-4-LP,[2] W-4-LP |EVENT DATE: 06/13/96 | +------------------------------------------------+EVENT TIME: 00:50[EDT]| |NRC NOTIFIED BY: JACK BRISSON |LAST UPDATE DATE: 06/13/96 | |HQ OPS OFFICER: RUDY KARSCH +-----------------------------+ +------------------------------------------------+ NOTIFICATIONS | |EMERGENCY CLASS: NOT APPLICABLE +-----------------------------+ |10 CFR SECTION: |CAUDLE JULIAN 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 N 0 STARTUP | 0 HOT STANDBY | | | | | | | | | +-----+---------------------------------------------+--------------------------+ EVENT TEXT +------------------------------------------------------------------------------+ | REACTOR TRIP DUE TO LOSS OF POWER TO VITAL INVERTER SUPPLYING INTERMEDIATE | | RANGE NUCLEAR INSTRUMENTATION. | | | | THE UNIT WAS SHUTTING DOWN FOR A REFUELING, PREPARING TO CONDUCT ROD DROP | | TESTS WHEN A CIRCUIT BREAKER FROM THE VITAL DISTRIBUTION CENTER VITAL | | INVERTER TRIPPED (CAUSE UNKNOWN). THIS LOSS OF POWER CAUSED NUMEROUS | | ERRONEOUS INSTRUMENTATION INDICATIONS, INCLUDING A SPURIOUS HIGH READING ON | | ONE CHANNEL OF INTERMEDIATE RANGE NUCLEAR INSTRUMENTATION, WHICH TRIPPED | | THE REACTOR. ALL CONTROL RODS FULLY INSERTED FOLLOWING THE TRIP. TWO ESF | | ACTUATIONS OCCURRED. FEED WATER ISOLATED DUE TO LOW REACTOR COOLANT | | TEMPERATURE FOLLOWING THE REACTOR TRIP, AND AUXILIARY FEED WATER WAS | | MANUALLY INITIATED. VITAL POWER TO CHANNEL "A" HAS BEEN RESTORED, FED FROM | | A REGULATED NON-SAFETY SOURCE. THE UNIT IS STABLE IN MODE 3. THE LICENSEE | | INFORMED THE NRC RESIDENT INSPECTOR. | +------------------------------------------------------------------------------+ +----------------------------------+ +-----------------------+ |POWER REACTOR | |EVENT NUMBER: 30628 | +----------------------------------+ +-----------------------+ +------------------------------------------------+-----------------------------+ |FACILITY: MAINE YANKEE REGION: 1 |NOTIFICATION DATE: 06/13/96 | |UNIT: [1] [ ] [ ] STATE: ME |NOTIFICATION TIME: 20:24 [ET]| |RX TYPE: [1] CE |EVENT DATE: 06/13/96 | +------------------------------------------------+EVENT TIME: 19:35[EDT]| |NRC NOTIFIED BY: BOB MALONEY |LAST UPDATE DATE: 06/13/96 | |HQ OPS OFFICER: DICK JOLLIFFE +-----------------------------+ +------------------------------------------------+ NOTIFICATIONS | |EMERGENCY CLASS: NOT APPLICABLE +-----------------------------+ |10 CFR SECTION: |KENNETH JENISON RDO | |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 90 POWER OPERATION | 90 POWER OPERATION | | | | | | | | | +-----+---------------------------------------------+--------------------------+ EVENT TEXT +------------------------------------------------------------------------------+ | -CONCRETE BLOCKS COULD DAMAGE RAD MONITOR SAMPLE LINES DURING SEISMIC EVENT | | | | DURING THE PERFORMANCE OF A DESIGN BASIS REVIEW, THE LICENSEE DETERMINED | | THAT AN UNRESTRAINED STACK OF CONCRETE SHIELD BLOCKS (2.5 FEET X 2.5 FEET | | X 3 FEET HIGH) COULD DAMAGE RAD MONITOR SAMPLE LINES DURING A SEISMIC | | EVENT. THE CONCRETE BLOCKS ARE LOCATED ON THE FLOOR OF THE PRIMARY | | AUXILIARY BUILDING IN THE VICINITY OF SAMPLE LINES TO THE PRIMARY VENT | | STACK NOBLE GAS ACTIVITY RADIATION MONITOR #RM-3902Y AND PRIMARY VENT STACK | | AIR PARTICULATE RADIATION MONITOR #RM-3902X. | | | | THE LICENSEE PLANS TO REMOVE THE CONCRETE BLOCKS. | | | | THE LICENSEE INFORMED THE NRC RESIDENT INSPECTOR. | +------------------------------------------------------------------------------+ +----------------------------------+ +-----------------------+ |POWER REACTOR | |EVENT NUMBER: 30629 | +----------------------------------+ +-----------------------+ +------------------------------------------------+-----------------------------+ |FACILITY: DIABLO CANYON REGION: 4 |NOTIFICATION DATE: 06/13/96 | |UNIT: [1] [ ] [ ] STATE: CA |NOTIFICATION TIME: 21:06 [ET]| |RX TYPE: [1] W-4-LP,[2] W-4-LP |EVENT DATE: 06/13/96 | +------------------------------------------------+EVENT TIME: 17:45[PDT]| |NRC NOTIFIED BY: GARY ANDERSON |LAST UPDATE DATE: 06/13/96 | |HQ OPS OFFICER: DICK JOLLIFFE +-----------------------------+ +------------------------------------------------+ NOTIFICATIONS | |EMERGENCY CLASS: NOT APPLICABLE +-----------------------------+ |10 CFR SECTION: |JOHN PELLET RDO | |ADEG 50.72(b)(1)(ii) DEGRAD COND DURING OP | | | | | | | | | | | | | | +-----+----------+-------+--------+--------------+--+--------+-----------------+ |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 +------------------------------------------------------------------------------+ | - TECH SPEC 3.0.3 NOT ENTERED WITH 2 RHR TRAINS INOPERABLE FOR 70 MINUTES - | | | | AT 0219 (PDT) ON 06/12/96, THE LICENSEE DECLARED THE TRAIN 'A' RHR PUMP | | #1-2 INOPERABLE FOR MAINTENANCE ACTIVITIES. TECH SPEC LCO A/S 3.5.2 | | REQUIRES THE LICENSEE TO RESTORE THE PUMP TO OPERABLE STATUS WITHIN | | 72 HOURS OR TO PLACE THE PLANT IN MODE 3 (HOT STANDBY) WITHIN THE NEXT | | 6 HOURS. | | | | AT 1321 (PDT) ON 06/13/96, WITH THE #1-2 PUMP STILL INOPERABLE, THE | | LICENSEE DECLARED THE TRAIN 'B' RHR PUMP #1-1 INOPERABLE IN ORDER TO | | PERFORMING TESTING OF THE SOLID STATE PROTECTION (SSP) SYSTEM. | | | | AT 1431 (PDT) ON 06/13/96, THE LICENSEE COMPLETED THE TESTING OF THE SSP | | SYSTEM AND DECLARED THE #1-1 RHR PUMP OPERABLE. | | | | TECH SPEC LCO A/S 3.0.3 REQUIRES THE LICENSEE TO RESTORE AT LEAST 1 OF 2 | | INOPERABLE RHR PUMPS TO OPERABLE STATUS WITHIN 1 HOUR OR BEGIN TO SHUT THE | | PLANT DOWN. | | | | AT 1745 (PDT) ON 06/13/96, THE LICENSEE DETERMINED THAT BOTH TRAINS OF THE | | RHR SYSTEM (BOTH RHR PUMPS) HAD BEEN INOPERABLE FOR 1 HOUR AND 10 MINUTES | | ON 06/13/96. | | | | THE LICENSEE WILL INFORM THE NRC RESIDENT INSPECTOR. | +------------------------------------------------------------------------------+ +----------------------------------+ +-----------------------+ |POWER REACTOR | |EVENT NUMBER: 30630 | +----------------------------------+ +-----------------------+ +------------------------------------------------+-----------------------------+ |FACILITY: CLINTON REGION: 3 |NOTIFICATION DATE: 06/13/96 | |UNIT: [1] [ ] [ ] STATE: IL |NOTIFICATION TIME: 21:38 [ET]| |RX TYPE: [1] GE-6 |EVENT DATE: 06/13/96 | +------------------------------------------------+EVENT TIME: 17:20[CDT]| |NRC NOTIFIED BY: GREG HALVERSON |LAST UPDATE DATE: 06/13/96 | |HQ OPS OFFICER: DICK JOLLIFFE +-----------------------------+ +------------------------------------------------+ NOTIFICATIONS | |EMERGENCY CLASS: NOT APPLICABLE +-----------------------------+ |10 CFR SECTION: |BRUCE JORGENSEN RDO | |ARPS 50.72(b)(2)(ii) RPS ACTUATION | | | | | | | | | | | | | | +-----+----------+-------+--------+--------------+--+--------+-----------------+ |UNIT |SCRAM CODE|RX CRIT|INIT PWR| INIT RX MODE |CURR PWR| CURR RX MODE | +-----+----------+-------+--------+-----------------+--------+-----------------+ | 1 | M/R Y 100 POWER OPERATION | 0 HOT SHUTDOWN | | | | | | | | | +-----+---------------------------------------------+--------------------------+ EVENT TEXT +------------------------------------------------------------------------------+ | - MANUAL Rx SCRAM FROM 100% DUE TO OPERATION IN THE Rx INSTABILITY REGION - | | | | WHILE PERFORMING MAINTENANCE ACTIVITIES ON THE MAIN FEEDWATER LOW FLOW | | TRIP UNIT, I & C TECHNICIANS WERE CONNECTING A TEST LEAD TO A TERMINAL | | BOARD WHEN A SPARK WAS OBSERVED WHICH MOMENTARILY GROUNDED THE REACTOR | | RECIRCULATION LOW LEVEL TRIP UNITS. THIS ACTION CAUSED BOTH REACTOR | | RECIRCULATION PUMPS TO DOWNSHIFT TO SLOW SPEED. | | | | CONTROL ROOM OPERATORS DETERMINED THAT THEY WERE OPERATING IN THE | | REACTOR INSTABILITY REGION AND IMMEDIATELY MANUALLY SCRAMMED THE PLANT | | FROM 100% POWER. ALL CONTROL RODS INSERTED COMPLETELY. STEAM IS BEING | | DUMPED TO THE MAIN CONDENSER. | | | | THE PLANT IS STABLE IN OPERATIONAL CONDITION 3 (HOT SHUTDOWN). | | | | THE LICENSEE IS INVESTIGATING THE CAUSE OF THE EVENT AND PLANS TO RESTART | | THE PLANT ON 06/14/96. | | | | THE LICENSEE INFORMED THE NRC RESIDENT INSPECTOR. | +------------------------------------------------------------------------------+