U.S. Nuclear Regulatory Commission Operations Center Event Reports For 04/06/94 - 04/07/94 ** EVENT NUMBERS ** 27043 27044 27046 27047 27048 27049 27050 27051 +----------------------------------+ +-----------------------+ |POWER REACTOR | |EVENT NUMBER: 27043 | +----------------------------------+ +-----------------------+ +------------------------------------------------+-----------------------------+ |FACILITY: OYSTER CREEK REGION: 1 |NOTIFICATION DATE: 04/05/94 | |UNIT: [1] [ ] [ ] STATE: NJ |NOTIFICATION TIME: 16:23 [ET]| |RX TYPE: [1] GE-2 |EVENT DATE: 04/05/94 | +------------------------------------------------+EVENT TIME: 15:50[EDT]| |NRC NOTIFIED BY: GEORGE VOIFHNIS |LAST UPDATE DATE: 04/06/94 | |HQ OPS OFFICER: WILLIAM HUFFMAN +-----------------------------+ +------------------------------------------------+ NOTIFICATIONS | |EMERGENCY CLASS: NOT APPLICABLE +-----------------------------+ |10 CFR SECTION: |WALTER PASCIAK 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 | A/R Y 100 POWER OPERATION | 0 HOT SHUTDOWN | | | | | | | | | +-----+---------------------------------------------+--------------------------+ EVENT TEXT +------------------------------------------------------------------------------+ | REACTOR SCRAM FOLLOWING HIGH REACTOR WATER LEVEL TRANSIENT. | | | | WHILE OPERATING AT FULL POWER, THE PLANT EXPERIENCED A REACTOR WATER LEVEL | | TRANSIENT WHICH RESULTED IN A TURBINE TRIP FOLLOWED BY A REACTOR SCRAM. ALL | | RODS FULLY INSERTED. THE REACTOR IS STABLE AT 930 PSI WITH A WATER LEVEL OF | | 150 INCHES. DECAY HEAT IS BEING DISCHARGED TO THE CONDENSER. FEED IS BEING | | SUPPLIED BY A SINGLE FEEDPUMP. NO SAFETY RELIEF VALVES LIFTED DURING THE | | TRANSIENT. ALL SYSTEMS FUNCTIONED AS REQUIRED. THE CAUSE OF THE WATER LEVEL | | TRANSIENT IS STILL UNDER INVESTIGATION. | | | | THE REACTOR WAS OPERATING IN THE NORMAL WATER LEVEL BAND OF 155 TO 165 | | INCHES WHEN WATER LEVEL STARTED TO INCREASE. WHEN LEVEL REACHED 175 INCHES | | AN AUTOMATIC TRIP OF THE TURBINE OCCURRED FOLLOWED BY AN AUTOMATIC REACTOR | | SCRAM. WATER LEVEL CONTINUED TO INCREASE TO 190 INCHES AT WHICH POINT ALL | | REACTOR FEEDPUMPS WERE PROCEDURALLY STOPPED. THE WATER LEVEL TRANSIENT WAS | | STABILIZED AND BROUGHT BACK TO THE NORMAL RANGE. | | | | THE CAUSE OF THE LEVEL TRANSIENT IS STILL NOT KNOWN. THE LICENSEE NOTES | | THAT THE RECIRCULATION PUMPS TRIPPED DURING THE TRANSIENT. THE CAUSE OF THE | | RECIRC PUMP TRIP IS SPECULATED TO BE FROM A HIGH PRESSURE SPIKE WHEN THE | | TURBINE TRIPPED. NOTHING ELSE UNUSUAL OR NOT UNDERSTOOD OCCURRED DURING THE | | TRANSIENT. THE LICENSEE IS PROCEEDING TO COLD SHUTDOWN PRIOR TO RESTARTING | | THE RECIRCULATION PUMPS. | | | | THE NRC RESIDENT INSPECTOR HAS BEEN INFORMED. | | | | *** UPDATE DATE/TIME:4/6/94 @ 0400 EDT BY:McGINTY *** | | DURING THE MORNING STATUS CALL, THE LICENSEE SAID THAT THE CAUSE OF THE | | WATER LEVEL TRANSIENT WAS THE DENSITY COMPENSATION TO THE STEAM FLOW | | ELEMENTS, WHICH FAILED UPSCALE. THIS CAUSED THE REACTOR FEEDWATER WATER | | PUMPS TO GO INTO FULL RUNOUT, AND THE SUBSEQUENT LEVEL INCREASE. | +------------------------------------------------------------------------------+ +----------------------------------+ +-----------------------+ |POWER REACTOR | |EVENT NUMBER: 27044 | +----------------------------------+ +-----------------------+ +------------------------------------------------+-----------------------------+ |FACILITY: FT SAINT VRAIN REGION: 4 |NOTIFICATION DATE: 04/05/94 | |UNIT: [1] [ ] [ ] STATE: CO |NOTIFICATION TIME: 16:36 [ET]| |RX TYPE: [1] GA (GENERAL ATOMIC) |EVENT DATE: 04/04/94 | +------------------------------------------------+EVENT TIME: 14:00[MDT]| |NRC NOTIFIED BY: JOHN HACK |LAST UPDATE DATE: 04/06/94 | |HQ OPS OFFICER: WILLIAM HUFFMAN +-----------------------------+ +------------------------------------------------+ NOTIFICATIONS | |EMERGENCY CLASS: NOT APPLICABLE +-----------------------------+ |10 CFR SECTION: |IAN BARNES RDO | |APRE 50.72(b)(2)(vi) OFFSITE NOTIFICATION | | | | | | | | | | | | | | +-----+----------+-------+--------+--------------+--+--------+-----------------+ |UNIT |SCRAM CODE|RX CRIT|INIT PWR| INIT RX MODE |CURR PWR| CURR RX MODE | +-----+----------+-------+--------+-----------------+--------+-----------------+ | 1 | N N 0 DECOMMISSIONED | 0 DECOMMISSIONED | | | | | | | | | +-----+---------------------------------------------+--------------------------+ EVENT TEXT +------------------------------------------------------------------------------+ | FOUR HOUR NON-EMERGENCY REPORT BECAUSE OF OFFSITE NOTIFICATION OF HIGH PH | | IN A WASTE WATER DITCH. | | | | THE FACILITY REPORTED A HIGH PH IN A WASTE WATER DITCH. THE LICENSEE | | NOTIFIED THE COLORADO DEPARTMENT OF HEALTH. THE HIGH PH WAS FIRST NOTED ON | | 4/4/94 AT APPROXIMATELY 1400 MDT. REGION IV WILL BE INFORMED BY THE | | LICENSEE. | | | | ***UPDATE TO WEAVER FROM HACKS AT 1524 EDT ON 4/6/94*** | | REPORTED ANOTHER ph EXCURSION FOR SAME REASON AS ABOVE. COLORADO HEALTH | | DEPARTMENT NOTIFIED AGAIN. R4DO(BARNES) INFORMED. | | | | HOO NOTE: THE R4DO WILL INVESTIGATE WHETHER THESE REPORTS ARE STILL | | REQUIRED FROM FT. ST. VRAIN. | +------------------------------------------------------------------------------+ +----------------------------------+ +-----------------------+ |POWER REACTOR | |EVENT NUMBER: 27046 | +----------------------------------+ +-----------------------+ +------------------------------------------------+-----------------------------+ |FACILITY: BRAIDWOOD REGION: 3 |NOTIFICATION DATE: 04/05/94 | |UNIT: [ ] [2] [ ] STATE: IL |NOTIFICATION TIME: 18:39 [ET]| |RX TYPE: [1] W-4-LP,[2] W-4-LP |EVENT DATE: 04/05/94 | +------------------------------------------------+EVENT TIME: 15:39[CDT]| |NRC NOTIFIED BY: RALPH RICHARD |LAST UPDATE DATE: 04/06/94 | |HQ OPS OFFICER: WILLIAM HUFFMAN +-----------------------------+ +------------------------------------------------+ NOTIFICATIONS | |EMERGENCY CLASS: NOT APPLICABLE +-----------------------------+ |10 CFR SECTION: |BRUCE BURGESS RDO | |ARPS 50.72(b)(2)(ii) RPS ACTUATION |ROBERT CAPRA EO | | | | | | | | | | | | | +-----+----------+-------+--------+--------------+--+--------+-----------------+ |UNIT |SCRAM CODE|RX CRIT|INIT PWR| INIT RX MODE |CURR PWR| CURR RX MODE | +-----+----------+-------+--------+-----------------+--------+-----------------+ | | | | | 2 | A/R Y 100 POWER OPERATION | 0 HOT STANDBY | | | | | +-----+---------------------------------------------+--------------------------+ EVENT TEXT +------------------------------------------------------------------------------+ | REACTOR TRIP WITH STUCK ROD FOLLOWING A MAIN TRANSFORMER FAULT. | | | | THE FACSIMILE OF THE EVENT REPORT READS AS FOLLOWS: | | "UNIT 2 RECEIVED A MAIN TRANSFORMER DIFFERENTIAL CURRENT GENERATOR TRIP | | CAUSING A TURBINE TRIP/REACTOR TRIP ABOVE P-8. ALL SYSTEMS RESPONDED AS | | EXPECTED EXCEPT WE HAVE INDICATION OF ONE ROD STUCK OUT AT 210 STEPS(K2). | | ALL ACTIONS AS REQUIRED PER EMERGENCY PROCEDURES ARE COMPLETE. | | INVESTIGATION OF MAIN TRANSFORMER "2E" SHOWS MINIMAL OIL LEAKAGE. ACTIONS | | PER BWRP 750-8 (OIL SPILL PREVENTION AND CONTROL COUNTERMEASURE PLANS) ARE | | IN PROGRESS." | | | | THE REACTOR IS STABLE AT 557 DEGREES AND 2235 PSI. DECAY HEAT IS BEING | | DISCHARGED TO THE MAIN CONDENSER. FEEDWATER IS BEING SUPPLIED WITH A | | STARTUP FEEDWATER PUMP. NO PRIMARY OR SECONDARY SAFETIES LIFTED DURING THE | | TRANSIENT. THE MAIN TRANSFORMER FAULT CAUSED AN ACTUATION OF THE FIRE | | PROTECTION WATER SYSTEM. NO ACTUAL FIRE WAS OBSERVED ON THE TRANSFORMER BUT | | SOME SMOKE AND STEAM WAS SEEN. A LIGHT OIL SHEEN ON THE OUTSIDE OF THE | | TRANSFORMER CASING INDICATES THE THE TRANSFORMER RELIEF VALVE MAY HAVE | | LIFTED. OTHER THAN ALREADY DESCRIBED, NOTHING UNUSUAL OR NOT UNDERSTOOD | | OCCURRED DURING THE TRANSIENT. | | | | THE APPARENT STUCK ROD WAS AT 231 STEPS BEFORE THE TRIP. AFTER THE TRIP IT | | WAS INDICATING 210 STEPS ON THE DIGITAL ROD POSITION INDICATION (DRPI) | | SYSTEM. THE LICENSEE HAS NOT YET INDEPENDENTLY CONFIRMED THAT THE ROD IS | | ACTUALLY STUCK. | | | | THE LICENSEE IS REMAINING IN MODE 3 WHILE THEY ASSESS THE SITUATION AND | | DETERMINE A COURSE OF ACTION. THE NRC RESIDENT INSPECTOR HAS BEEN INFORMED. | | | | *** UPDATE DATE/TIME:04/06/94 @ 0630 EDT BY:McGINTY *** | | ROD "K2" HAS BEEN CONFIRMED TO BE STUCK AT 210 STEPS. THE LICENSEE | | PERFORMED A SPECIAL TEST TONIGHT WHERE THEY DRIVE THE ROD IN 5 STEPS, FOR | | WHICH THE ROD INDICATION DID NOT MOVE. THEN, THE OPERATORS PULLED THE ROD | | OUT FOR 5 STEPS, AND IT DID MOVE OUT. UPON TRIPPING THE RX TRIP BREAKERS, | | THE ROD ENDED UP AT THE SAME 210 STEP POSITION. THERE APPEARS TO BE SOME | | KIND OF MECHANICAL BINDING, AND THE LICENSEE SAID ANYTHING BEYOND THAT | | WOULD BE SPECULATION AT THIS TIME. THE EXACT COURSE OF ACTION IS YET TO BE | | DETERMINED. HOO NOTIFIED THE R3DO (BURGESS). | | | | *** UPDATE @ 1600 EDT ON 4/6/94 BY WEAVER*** A COMMISSIONERS ASSISTANTS | | BRIEFING WAS HELD WITH THE FOLLOWING PERSONS (* INDICATES DID NOT | | PARTICIPATE): JORDAN (AEOD), HAYDEN (PAO), BANGART (STATE), HOWELL (ED0), | | CHAFFEE (NRR), SECY(*), IP(*), MADDEN (CONGRESSIONAL AFFAIRS), SORENSON | | (ROGER'S ASST.), VIETTE-COOK (SELIN'S ASST.), DOOLITTLE (REMICK'S ASST.), | | RULAND (de PLANQUE'S ASST.), BRIEFER (T. MARTIN, R3). | +------------------------------------------------------------------------------+ +----------------------------------+ +-----------------------+ |POWER REACTOR | |EVENT NUMBER: 27047 | +----------------------------------+ +-----------------------+ +------------------------------------------------+-----------------------------+ |FACILITY: RIVER BEND REGION: 4 |NOTIFICATION DATE: 04/06/94 | |UNIT: [1] [ ] [ ] STATE: LA |NOTIFICATION TIME: 05:54 [ET]| |RX TYPE: [1] GE-6 |EVENT DATE: 04/06/94 | +------------------------------------------------+EVENT TIME: 01:54[CDT]| |NRC NOTIFIED BY: BOYLE |LAST UPDATE DATE: 04/06/94 | |HQ OPS OFFICER: TIM McGINTY +-----------------------------+ +------------------------------------------------+ NOTIFICATIONS | |EMERGENCY CLASS: NOT APPLICABLE +-----------------------------+ |10 CFR SECTION: |IAN BARNES RDO | |AESF 50.72(b)(2)(ii) ESF ACTUATION | | | | | | | | | | | | | | +-----+----------+-------+--------+--------------+--+--------+-----------------+ |UNIT |SCRAM CODE|RX CRIT|INIT PWR| INIT RX MODE |CURR PWR| CURR RX MODE | +-----+----------+-------+--------+-----------------+--------+-----------------+ | 1 | N Y 98 POWER OPERATION | 98 POWER OPERATION | | | | | | | | | +-----+---------------------------------------------+--------------------------+ EVENT TEXT +------------------------------------------------------------------------------+ | LOSS OF 230 KV LINE TO EXXON STATION CAUSED SEVERAL ESF ACTUATIONS | | (POSSIBLY WILL BE CONSIDERED INVALID) | | | | THIS NOTIFICATION IS BEING MADE AS A CONSERVATIVE MEASURE, PENDING RESULTS | | OF AN ENGINEERING INVESTIGATION. | | | | AT 0154 CDT, A VOLTAGE TRANSIENT OCCURRED DUE TO THE LOSS OF A 230 KV | | OFF-SITE LINE (TO EXXON STATION). PLANT RESPONSE RESULTED IN: | | - A HALF MSIV ISOLATION | | - BOTH STANDBY GAS TREATMENT SYSTEMS STARTED | | - ANNULUS MIXING SYSTEM STARTED | | - FUEL BUILDING FILTER TRAIN "B" STARTED ("A" WAS OUT OF SERVICE) | | - DIV. 2 CONTROL BUILDING VENTILATION AUTO-STARTED | | - BOTH RWCU PUMPS TRIPPED, WITH NO ISOLATIONS ON ANY RWCU VALVE | | - FUEL BUILDING AND AUXILIARY BUILDING DIV. 2 DAMPERS ISOLATED | | | | ENGINEERING IS INVESTIGATING WHAT HAPPENED. THE LICENSEE DID NOT LOSE | | POWER TO ANYTHING THAT STAYED OUT. THE PLANT IS OPERATING SMOOTHLY AT THIS | | TIME WITH NOTHING ABNORMAL. ALL OF THE ABOVE EQUIPMENT HAS BEEN RETURNED | | TO A STANDBY STATUS. THE LICENSEE INFORMED THE RESIDENT INSPECTOR. | +------------------------------------------------------------------------------+ +----------------------------------+ +-----------------------+ |POWER REACTOR | |EVENT NUMBER: 27048 | +----------------------------------+ +-----------------------+ +------------------------------------------------+-----------------------------+ |FACILITY: COMANCHE PEAK REGION: 4 |NOTIFICATION DATE: 04/06/94 | |UNIT: [1] [2] [ ] STATE: TX |NOTIFICATION TIME: 06:40 [ET]| |RX TYPE: [1] W-4-LP,[2] W-4-LP |EVENT DATE: 04/06/94 | +------------------------------------------------+EVENT TIME: 05:00[CDT]| |NRC NOTIFIED BY: BUTLER |LAST UPDATE DATE: 04/06/94 | |HQ OPS OFFICER: TIM McGINTY +-----------------------------+ +------------------------------------------------+ NOTIFICATIONS | |EMERGENCY CLASS: NOT APPLICABLE +-----------------------------+ |10 CFR SECTION: |IAN BARNES RDO | |APRE 50.72(b)(2)(vi) OFFSITE NOTIFICATION | | | | | | | | | | | | | | +-----+----------+-------+--------+--------------+--+--------+-----------------+ |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 73 POWER OPERATION | 73 POWER OPERATION | | | | | +-----+---------------------------------------------+--------------------------+ EVENT TEXT +------------------------------------------------------------------------------+ | THE LICENSEE NOTIFIED THE FAA THAT THE DOME LIGHTS ON TOP AT BOTH UNITS ARE | | OUT. THE OTHER OBSTRUCTIONAL LIGHTS ARE ON, BUT ARE ON STEADY (VICE | | BLINKING) DUE TO BEING ON DC POWER. THIS IS DUE TO SCHEDULED WORK FOR | | BREAKER REPLACEMENT ON A MOTOR CONTROL CENTER. THE LICENSEE WILL INFORM | | THE RESIDENT INSPECTOR. | +------------------------------------------------------------------------------+ +----------------------------------+ +-----------------------+ |GENERAL INFORMATION or OTHER | |EVENT NUMBER: 27049 | +----------------------------------+ +-----------------------+ +------------------------------------------------+-----------------------------+ |LICENSEE: NEW ENGLAND POWER CO. |NOTIFICATION DATE: 04/06/94 | | CITY: SUMERSET REGION: 1 |NOTIFICATION TIME: 09:20 [ET]| | COUNTY: STATE: MA |EVENT DATE: 04/06/94 | |LICENSE#: 02-07227-02 AGREEMENT: N |EVENT TIME: 08:00[EDT]| | DOCKET: |LAST UPDATE DATE: 04/06/94 | | +-----------------------------+ | |PERSON ORGANIZATION| | |R BELLAMY RDO | | |BILL BRACH (NMSS) EO | +------------------------------------------------+ | |NRC NOTIFIED BY: GREG SALAMON | | |HQ OPS OFFICER: JOHN MacKINNON | | +------------------------------------------------+ | |EMERGENCY CLASS: NOT APPLICABLE | | |10 CFR SECTION: | | |NINF INFORMATION ONLY | | | | | | | | | | | | | | +------------------------------------------------+-----------------------------+ EVENT TEXT +------------------------------------------------------------------------------+ | BRAYTON POINT STATION (FOSSIL FUEL POWER PLANT) REPORTED LOSING A 1.7 | | microcurie STRONTIUM-90 SEALED SOURCE. | | | | LICENSEE SAID THAT THEY HAD HIRED TEXAS NUCLEAR TO REMOVE AND DISPOSE OF A | | 1.7 microcurie STRONTIUM-90 USED FOR MEASURING LEVEL IN THEIR COAL SILO. | | THIS SOURCE WAS A SEALED SOURCE AND WAS INSTALLED BY TEXAS NUCLEAR BACK IN | | 1979. THE MANUFACTURER OF THE SOURCE IS TEXAS NUCLEAR AND ITS SERIAL # IS | | B-2062. LICENSEE THINKS THAT THIS SOURCE MAY HAVE NEVER BEEN INSTALLED. | | ADDRESS OF BRAYTON POINT STATION IS P.O BOX 440, SUMERSET, MA. | +------------------------------------------------------------------------------+ +----------------------------------+ +-----------------------+ |POWER REACTOR | |EVENT NUMBER: 27050 | +----------------------------------+ +-----------------------+ +------------------------------------------------+-----------------------------+ |FACILITY: HOPE CREEK REGION: 1 |NOTIFICATION DATE: 04/06/94 | |UNIT: [1] [ ] [ ] STATE: NJ |NOTIFICATION TIME: 12:12 [ET]| |RX TYPE: [1] GE-4 |EVENT DATE: 04/06/94 | +------------------------------------------------+EVENT TIME: 10:15[EDT]| |NRC NOTIFIED BY: JESSE PIKE |LAST UPDATE DATE: 04/06/94 | |HQ OPS OFFICER: JOSEPH SEBROSKY +-----------------------------+ +------------------------------------------------+ NOTIFICATIONS | |EMERGENCY CLASS: NOT APPLICABLE +-----------------------------+ |10 CFR SECTION: |WALTER PASCIAK RDO | |APRE 50.72(b)(2)(vi) OFFSITE NOTIFICATION | | | |FRANK INGRAM PA | | | | | | | | | | +-----+----------+-------+--------+--------------+--+--------+-----------------+ |UNIT |SCRAM CODE|RX CRIT|INIT PWR| INIT RX MODE |CURR PWR| CURR RX MODE | +-----+----------+-------+--------+-----------------+--------+-----------------+ | 1 | N N 0 REFUELING | 0 REFUELING | | | | | | | | | +-----+---------------------------------------------+--------------------------+ EVENT TEXT +------------------------------------------------------------------------------+ | HOPE CREEK IS MAKING A REPORT IN CONJUNCTION WITH SALEM 1 AND 2 DUE TO AN | | OFFSITE NOTIFICATION. | | | | THE SIRENS FOR THE STATE OF NEW JERSEY AROUND THE SITE INADVERTENTLY | | ACTUATED FOR 3 MINUTES DUE TO A MALFUNCTION. THE STATE OF NEW JERSEY | | BROADCAST A MESSAGE ON THE EMERGENCY BROADCAST SYSTEM TO NOTIFY THE PUBLIC | | THAT THE SIREN ALARM WAS A FALSE ALARM. SALEM COUNTY OFFICIALS PLAN TO | | ISSUE A PRESS RELEASE ON THE EVENT, HOWEVER, THE LICENSEE DOES NOT PLAN TO | | ISSUE A PRESS RELEASE. | | | | STATE AND COUNTY OFFICIALS ARE INVESTIGATING THE CAUSE OF THE INADVERTENT | | ACTUATION OF THE EMERGENCY SIRENS. THE LICENSEE WILL INFORM THE RESIDENT | | INSPECTOR AND WILL ALSO INFORM LOWER ALLOWAYS CREEK TOWNSHIP OFFICIALS. | +------------------------------------------------------------------------------+ +----------------------------------+ +-----------------------+ |POWER REACTOR | |EVENT NUMBER: 27051 | +----------------------------------+ +-----------------------+ +------------------------------------------------+-----------------------------+ |FACILITY: OCONEE REGION: 2 |NOTIFICATION DATE: 04/06/94 | |UNIT: [ ] [2] [ ] STATE: SC |NOTIFICATION TIME: 12:44 [ET]| |RX TYPE: [1] B&W-L-LP,[2] B&W-L-LP,[3] B&W-L-LP |EVENT DATE: 04/06/94 | +------------------------------------------------+EVENT TIME: 11:08[EDT]| |NRC NOTIFIED BY: SCOTT HOLLINGSWORTH |LAST UPDATE DATE: 04/06/94 | |HQ OPS OFFICER: WILLIAM HUFFMAN +-----------------------------+ +------------------------------------------------+ NOTIFICATIONS | |EMERGENCY CLASS: NOT APPLICABLE +-----------------------------+ |10 CFR SECTION: |KERRY LANDIS RDO | |ARPS 50.72(b)(2)(ii) RPS ACTUATION | | | | | | | | | | | | | | +-----+----------+-------+--------+--------------+--+--------+-----------------+ |UNIT |SCRAM CODE|RX CRIT|INIT PWR| INIT RX MODE |CURR PWR| CURR RX MODE | +-----+----------+-------+--------+-----------------+--------+-----------------+ | | | | | 2 | A/R Y 100 POWER OPERATION | 0 HOT STANDBY | | | | | +-----+---------------------------------------------+--------------------------+ EVENT TEXT +------------------------------------------------------------------------------+ | REACTOR TRIP ON LOSS OF BOTH MAIN FEEDWATER PUMPS. | | | | WHILE OPERATING AT FULL POWER, THE "2B" MAIN FEEDWATER PUMP TRIPPED | | UNEXPECTEDLY. THE INTEGRATED CONTROL SYSTEM INITIATED A RUNBACK TO 65% | | POWER AS DESIGNED. HOWEVER, DURING THE TRANSIENT, FEEDWATER OSCILLATIONS | | OCCURRED CULMINATING IN A TRIP OF THE "2A" FEEDWATER PUMP. THE LOSS OF BOTH | | FEEDWATER PUMPS RESULTED IN AN AUTOMATIC REACTOR TRIP. | | | | THE REACTOR IS CURRENTLY STABLE AT 2155 PSI AND 550 DEGREES. ALL RODS FULLY | | INSERTED. DECAY HEAT IS BEING DISCHARGED TO THE CONDENSER. SEVERAL MAIN | | STEAM SAFETIES MOMENTARILY OPENED DURING THE TRANSIENT, WHICH IS COMMON FOR | | THIS PLANT. THE EMERGENCY FEEDWATER SYSTEM ACTUATED AS DESIGNED TO SUPPLY | | WATER TO THE ONCE THRU STEAM GENERATORS. | | | | THE LICENSEE NOTES THAT MOTOR DRIVEN EMERGENCY FEEDWATER PUMP 2A WAS OUT OF | | SERVICE UNDER A SEVEN DAY LCO AND WAS UNAVAILABLE TO RESPOND. THE 2B MOTOR | | DRIVEN EMERGENCY FEEDWATER PUMP AND THE TURBINE DRIVEN EMERGENCY FEEDWATER | | PUMPS PERFORMED AS REQUIRED. | | | | THE CAUSE OF THE MAIN FEEDWATER PUMP TRIPS IS STILL UNDER INVESTIGATION. | | THE LICENSEE EXPECTS TO REMAIN IN MODE 3 UNTIL THE SCOPE OF CORRECTIVE | | ACTION IS DETERMINED. | | | | THE RESIDENT INSPECTOR HAS BEEN INFORMED. | +------------------------------------------------------------------------------+