U.S. Nuclear Regulatory Commission Operations Center Event Reports For 02/15/96 - 02/16/96 ** EVENT NUMBERS ** 29977 29979 29980 29981 29982 +----------------------------------+ +-----------------------+ |POWER REACTOR | |EVENT NUMBER: 29977 | +----------------------------------+ +-----------------------+ +------------------------------------------------+-----------------------------+ |FACILITY: COMANCHE PEAK REGION: 4 |NOTIFICATION DATE: 02/14/96 | |UNIT: [ ] [2] [ ] STATE: TX |NOTIFICATION TIME: 18:35 [ET]| |RX TYPE: [1] W-4-LP,[2] W-4-LP |EVENT DATE: 02/14/96 | +------------------------------------------------+EVENT TIME: 08:30[CST]| |NRC NOTIFIED BY: CLAUSER |LAST UPDATE DATE: 02/15/96 | |HQ OPS OFFICER: BOB STRANSKY +-----------------------------+ +------------------------------------------------+ NOTIFICATIONS | |EMERGENCY CLASS: NOT APPLICABLE +-----------------------------+ |10 CFR SECTION: |CHUCK CAIN RDO | |NLTR LICENSEE 24 HR REPORT | | | | | | | | | | | | | | +-----+----------+-------+--------+--------------+--+--------+-----------------+ |UNIT |SCRAM CODE|RX CRIT|INIT PWR| INIT RX MODE |CURR PWR| CURR RX MODE | +-----+----------+-------+--------+-----------------+--------+-----------------+ | | | | | 2 | N Y 95 POWER OPERATION | 89 POWER OPERATION | | | | | +-----+---------------------------------------------+--------------------------+ EVENT TEXT +------------------------------------------------------------------------------+ | 24-HOUR REPORT REQUIRED BY OPERATING LICENSE DUE TO EXCEEDING 100% POWER | | | | WITH THE UNIT OPERATING AT 95% POWER, A FEEDWATER HEATER BYPASS VALVE | | OPENED CAUSING A PARTIAL LOSS OF FEEDWATER HEATING. TURBINE LOAD REMAINED | | UNCHANGED, AND REACTOR POWER INCREASED IN RESPONSE TO DECREASING REACTOR | | COOLANT SYSTEM TEMPERATURE. REACTOR POWER REACHED A PEAK OF 102.5% FOR | | SEVERAL SECONDS BEFORE BEING REDUCED BY AN AUTOMATIC TURBINE RUNBACK DUE TO | | OVERPOWER DIFFERENTIAL TEMPERATURE (OPdT). REACTOR POWER WAS STABILIZED AT | | 89% OF RATED. | | | | THE CAUSE OF THE BYPASS VALVE OPENING IS CURRENTLY UNDER INVESTIGATION, BUT | | THE LICENSEE BELIEVES THAT IT MAY HAVE BEEN CAUSED BY UNRELATED CALIBRATION | | ACTIVITIES. | | | | THE NRC RESIDENT INSPECTOR HAS BEEN INFORMED BY THE LICENSEE. | | | | * * * UPDATE AT 1420 ON 02/15/96, BY OBAID BHATTY ENTERED BY JOLLIFFE * * * | | | | THE FOLLOWING IS ADDITIONAL INFORMATION ON THE ABOVE EVENT: | | | | WHILE INVESTIGATING THE CAUSE OF THIS EVENT, THE LICENSEE DETERMINED THAT | | IMMEDIATELY PRIOR TO THIS EVENT, AN I&C TECHNICIAN PERFORMING MAINTENANCE | | ACTIVITIES REMOVED A COMPUTER CARD FOR THE FEEDWATER HEATER BYPASS VALVE | | IN ORDER TO CALIBRATE THE CARD. AN AUTOMATIC RUNBACK OF THE MAIN TURBINE | | OCCURRED. CONTROL ROOM OPERATORS MANUALLY REDUCED POWER TO 89%. | | | | THE LICENSEE INFORMED THE NRC RESIDENT INSPECTOR. | | | | THE FOLLOWING SUBSEQUENT EVENT OCCURRED AT 1003 (CST) ON 02/14/96: | | | | WITH UNIT 2 AT 89% POWER, AFTER CALIBRATING THE COMPUTER CARD FOR THE | | FEEDWATER HEATER BYPASS VALVE, THE I&C TECHNICIAN INSERTED THE COMPUTER | | CARD INTO ITS CIRCUIT. THE FEEDWATER HEATER BYPASS VALVE OPENED AGAIN | | CAUSING A PARTIAL LOSS OF FEEDWATER HEATING. AS A RESULT, REACTOR POWER | | INCREASED AGAIN TO GREATER THAN 100% POWER. AN AUTOMATIC RUNBACK OF THE | | MAIN TURBINE OCCURRED AGAIN. CONTROL ROOM OPERATORS MANUALLY REDUCED POWER | | TO 89% AGAIN. | | | | THE LICENSEE PLACED A HOLD ON ALL FURTHER MAINTENANCE ACTIVITIES ON THIS | | VALVE AND IS CONTINUING TO INVESTIGATE THE CAUSE(S) OF THESE EVENTS. THE | | LICENSEE IS CALCULATING THE PEAK POWER REACHED AND PLANS TO SUBMIT AN LER | | ON THESE EVENTS TO THE NRC. | | | | THE LICENSEE INFORMED THE NRC RESIDENT INSPECTOR. THE HOO NOTIFIED THE | | R4DO (CHUCK CAIN) OF THIS UPDATE. | +------------------------------------------------------------------------------+ +----------------------------------+ +-----------------------+ |POWER REACTOR | |EVENT NUMBER: 29979 | +----------------------------------+ +-----------------------+ +------------------------------------------------+-----------------------------+ |FACILITY: INDIAN POINT REGION: 1 |NOTIFICATION DATE: 02/15/96 | |UNIT: [2] [ ] [ ] STATE: NY |NOTIFICATION TIME: 13:20 [ET]| |RX TYPE: [2] W-4-LP,[3] W-4-LP |EVENT DATE: 02/15/96 | +------------------------------------------------+EVENT TIME: 09:40[EST]| |NRC NOTIFIED BY: JOHN LIJOI |LAST UPDATE DATE: 02/15/96 | |HQ OPS OFFICER: DICK JOLLIFFE +-----------------------------+ +------------------------------------------------+ NOTIFICATIONS | |EMERGENCY CLASS: NOT APPLICABLE +-----------------------------+ |10 CFR SECTION: |RONALD BELLAMY RDO | |APRE 50.72(b)(2)(vi) OFFSITE NOTIFICATION | | | | | | | | | | | | | | +-----+----------+-------+--------+--------------+--+--------+-----------------+ |UNIT |SCRAM CODE|RX CRIT|INIT PWR| INIT RX MODE |CURR PWR| CURR RX MODE | +-----+----------+-------+--------+-----------------+--------+-----------------+ | 2 | N N 0 COLD SHUTDOWN | 0 COLD SHUTDOWN | | | | | | | | | +-----+---------------------------------------------+--------------------------+ EVENT TEXT +------------------------------------------------------------------------------+ | THE LICENSEE NOTIFIED THE DEPARTMENT OF TRANSPORTATION NATIONAL RESPONSE | | CENTER THAT ONE GALLON OF ANTIFREEZE HAD LEAKED ONTO THE PAVEMENT OUTSIDE | | THE OWNER CONTROLLED AREA. THE LICENSEE STOPPED THE LEAK AND CLEANED IT | | UP. | | | | THE LICENSEE WILL INFORM THE NRC RESIDENT INSPECTOR. | +------------------------------------------------------------------------------+ +----------------------------------+ +-----------------------+ |POWER REACTOR | |EVENT NUMBER: 29980 | +----------------------------------+ +-----------------------+ +------------------------------------------------+-----------------------------+ |FACILITY: ZION REGION: 3 |NOTIFICATION DATE: 02/15/96 | |UNIT: [ ] [2] [ ] STATE: IL |NOTIFICATION TIME: 20:47 [ET]| |RX TYPE: [1] W-4-LP,[2] W-4-LP |EVENT DATE: 02/15/96 | +------------------------------------------------+EVENT TIME: 19:18[CST]| |NRC NOTIFIED BY: JIM CARLSON |LAST UPDATE DATE: 02/15/96 | |HQ OPS OFFICER: DICK JOLLIFFE +-----------------------------+ +------------------------------------------------+ NOTIFICATIONS | |EMERGENCY CLASS: NOT APPLICABLE +-----------------------------+ |10 CFR SECTION: |MARK RING 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 | +-----+----------+-------+--------+-----------------+--------+-----------------+ | | | | | 2 | N Y 100 POWER OPERATION | 100 POWER OPERATION | | | | | +-----+---------------------------------------------+--------------------------+ EVENT TEXT +------------------------------------------------------------------------------+ | -TECH SPEC LCO A/S 3.0.3 ENTERED WITH 2 OF 4 CONTAINMENT PENETRATION | | PRESSURE ZONES INOPERABLE- | | | | WITH 1 OF 4 CONTAINMENT PENETRATION PRESSURE ZONES INOPERABLE, TECHNICIANS | | WERE PERFORMING A TEST OF VARIOUS SAFEGUARDS ACTUATIONS. | | | | AT 1605 (CST), A TECHNICIAN CYCLED A CONTAINMENT PURGE VALVE. THIS CAUSED | | A TEMPORARY DROP IN PRESSURE IN CONTAINMENT PENETRATION PRESSURE ZONE #2 | | BELOW 47 PSIG WHICH RENDERED ZONE #2 INOPERABLE. | | | | AT 1710 (CST), WITH 2 OF 4 CONTAINMENT PENETRATION PRESSURE ZONES | | INOPERABLE, THE LICENSEE ENTERED TECH SPEC LCO A/S 3.0.3 (4-HOUR SHUTDOWN | | LCO). | | | | AT 1808 (CST), THE LICENSEE RESTORED CONTAINMENT PENETRATION PRESSURE ZONE | | #2 TO GREATER THAN 47 PSIG. THE LICENSEE DECLARED ZONE #2 OPERABLE AND | | EXITED TECH SPEC LCO A/S 3.0.3. | | | | AT 1918 (CST), THE LICENSEE DETERMINED THAT UNIT 2 HAD BEEN OUTSIDE ITS | | DESIGN BASIS WHILE 2 OF 4 CONTAINMENT PENETRATION PRESSURE ZONES WERE | | INOPERABLE. | | | | THE LICENSEE PLANS TO SUBMIT AN LER TO THE NRC ON THIS EVENT. | | | | THE LICENSEE INFORMED THE NRC RESIDENT INSPECTOR. | +------------------------------------------------------------------------------+ +----------------------------------+ +-----------------------+ |POWER REACTOR | |EVENT NUMBER: 29981 | +----------------------------------+ +-----------------------+ +------------------------------------------------+-----------------------------+ |FACILITY: CRYSTAL RIVER REGION: 2 |NOTIFICATION DATE: 02/15/96 | |UNIT: [3] [ ] [ ] STATE: FL |NOTIFICATION TIME: 21:59 [ET]| |RX TYPE: [3] B&W-L-LP |EVENT DATE: 02/15/96 | +------------------------------------------------+EVENT TIME: 21:30[EST]| |NRC NOTIFIED BY: WALTER NEUMAN/JIM TINSLEY |LAST UPDATE DATE: 02/15/96 | |HQ OPS OFFICER: DICK JOLLIFFE +-----------------------------+ +------------------------------------------------+ NOTIFICATIONS | |EMERGENCY CLASS: NOT APPLICABLE +-----------------------------+ |10 CFR SECTION: |JOHN POTTER 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 | +-----+----------+-------+--------+-----------------+--------+-----------------+ | 3 | N Y 100 POWER OPERATION | 100 POWER OPERATION | | | | | | | | | +-----+---------------------------------------------+--------------------------+ EVENT TEXT +------------------------------------------------------------------------------+ | - SINGLE FAILURE COULD CAUSE INADEQUATE HPI SYSTEM INJECTION FLOW - | | | | WHILE REVIEWING PLANT EMERGENCY OPERATING PROCEDURES, THE LICENSEE | | DISCOVERED A POTENTIAL DISCREPANCY IN THE UFSAR HIGH PRESSURE INJECTION | | (HPI) SYSTEM LINE SMALL BREAK LOSS OF COOLANT ACCIDENT (LOCA) SINGLE | | FAILURE ANALYSIS. | | | | THE LICENSEE DETERMINED THAT IF ONE OF TWO DC BATTERIES FAILS DURING A LOSS | | OF OFFSITE POWER; THEN ONE OF TWO EMERGENCY DIESEL GENERATORS WILL NOT | | START, VALVES IN THE AFFECTED HPI SYSTEM TRAIN WILL NOT OPEN, AND THE FLOW | | INDICATION IN THE AFFECTED TRAIN WILL BE LOST. | | | | THUS, THE LOSS OF ONE OF TWO HPI SYSTEM TRAINS WILL RESULT IN INADEQUATE | | HPI SYSTEM INJECTION FLOW DURING A SMALL BREAK LOCA COINCIDENT WITH A LOSS | | OF OFFSITE POWER WITHOUT OPERATOR ACTIONS. | | | | THE LICENSEE PLANS TO COMPLETE ITS ANALYSIS AND SUBMIT AN LER TO THE NRC | | WITHIN 30 DAYS. | | | | THE LICENSEE WILL INFORM THE NRC RESIDENT INSPECTOR. | +------------------------------------------------------------------------------+ +----------------------------------+ +-----------------------+ |POWER REACTOR | |EVENT NUMBER: 29982 | +----------------------------------+ +-----------------------+ +------------------------------------------------+-----------------------------+ |FACILITY: TURKEY POINT REGION: 2 |NOTIFICATION DATE: 02/16/96 | |UNIT: [3] [ ] [ ] STATE: FL |NOTIFICATION TIME: 02:46 [ET]| |RX TYPE: [3] W-3-LP,[4] W-3-LP |EVENT DATE: 02/16/96 | +------------------------------------------------+EVENT TIME: 02:00[EST]| |NRC NOTIFIED BY: MIKE KOHL |LAST UPDATE DATE: 02/16/96 | |HQ OPS OFFICER: LEIGH TROCINE +-----------------------------+ +------------------------------------------------+ NOTIFICATIONS | |EMERGENCY CLASS: NOT APPLICABLE +-----------------------------+ |10 CFR SECTION: |JOHN POTTER RDO | |AOUT 50.72(b)(1)(ii)(B) OUTSIDE DESIGN BASIS | | |NLCO TECH SPEC LCO A/S | | | | | | | | | | | +-----+----------+-------+--------+--------------+--+--------+-----------------+ |UNIT |SCRAM CODE|RX CRIT|INIT PWR| INIT RX MODE |CURR PWR| CURR RX MODE | +-----+----------+-------+--------+-----------------+--------+-----------------+ | 3 | N Y 60 POWER OPERATION | 60 POWER OPERATION | | | | | | | | | +-----+---------------------------------------------+--------------------------+ EVENT TEXT +------------------------------------------------------------------------------+ | LOW INTAKE COOLING WATER SYSTEM FLOW DUE TO AN INFLUX OF AQUATIC GRASS IN | | THE INTAKE STRUCTURE | | | | WHILE BACKWASHING THE '3B' COMPONENT COOLING WATER (CCW)/INTAKE COOLING | | WATER (ICW) BASKET STRAINER AT 0200, UNIT 3 WENT OUTSIDE THE DESIGN BASIS | | WHEN THE MINIMUM ICW FLOW RATE OF 10,250 GPM COULD NOT BE MET. AT THE | | TIME, ICW FLOW WAS 7,000 GPM. AT 0208, THE '3B' CCW/ICW BASKET STRAINER | | WAS RETURNED TO SERVICE, AND TOTAL ICW FLOW WAS 17,000 GPM. (WHEN ONE | | HEADER IS OUT OF SERVICE FOR BACKWASHING, THE UNIT IS IN A 72-HOUR | | TECHNICAL SPECIFICATION LIMITING CONDITION FOR OPERATION.) | | | | THE LICENSEE DETERMINED THAT THE CAUSE OF THE FLOW PROBLEM WAS AQUATIC | | GRASS IN THE INTAKE STRUCTURE AND IS CONTINUING TO CLEAN THE BASKET | | STRAINERS ONE AT A TIME. LICENSEE MANAGEMENT MAY DECIDE TO TAKE UNIT 3 OFF | | LINE DUE TO THE ONGOING PROBLEM OF AQUATIC GRASS IN THE INTAKE STRUCTURE. | | | | THE LICENSEE WILL NOTIFY THE NRC RESIDENT INSPECTOR. | | | | * * * 0321 FEBRUARY 16, 1996, UPDATE FROM KOHL TAKEN BY TROCINE * * * | | | | AFTER BACKWASHING THE '3A' CCW/ICW BASKET STRAINER AND RETURNING IT TO | | SERVICE, ICW SYSTEM FLOW SUBSEQUENTLY DECREASE BELOW THE MINIMUM ICW FLOW | | RATE OF 10,250 GPM AGAIN AT 0300 DUE TO THE AQUATIC GRASS INFLUX. AS A | | RESULT, THE LICENSEE REMOVED THE '3B' CCW/ICW BASKET STRAINER FROM SERVICE | | AT 0300, BACKWASHED IT AGAIN, AND RETURNED IT TO SERVICE AT 0310 TO RESTORE | | ICW SYSTEM FLOW. | | | | IN ADDITION TO BACKWASHING THE CCW/ICW BASKET STRAINERS, THE LICENSEE IS | | RAKING THE INTAKE SCREENS. | | | | THE INFLUX OF AQUATIC GRASS IS ALSO CAUSING PROBLEMS WITH THE CIRCULATING | | WATER PUMPS. THE '3A1' CIRCULATING WATER PUMP IS CURRENTLY OUT OF SERVICE | | DUE TO GRASS IN THE WELL, AND OPERATORS ARE ALTERNATING BETWEEN OPERATION | | OF THE '3A2' AND '3B1' CIRCULATING WATER PUMPS. CURRENTLY, UNIT 4 IS NOT | | AFFECTED. | | | | AS A RESULT OF THE AQUATIC GRASS INFLUX, LICENSEE MANAGEMENT DIRECTED | | OPERATORS TO PLACE THE UNIT 3 IN MODE 3 (HOT STANDBY). A LOAD REDUCTION | | WAS COMMENCED AT 0320. | +------------------------------------------------------------------------------+