U.S. Nuclear Regulatory Commission Operations Center Event Reports For 07/12/94 - 07/13/94 ** EVENT NUMBERS ** 27409 27520 27522 27523 27524 27525 +----------------------------------+ +-----------------------+ |POWER REACTOR | |EVENT NUMBER: 27409 | +----------------------------------+ +-----------------------+ +------------------------------------------------+-----------------------------+ |FACILITY: LIMERICK REGION: 1 |NOTIFICATION DATE: 06/17/94 | |UNIT: [1] [ ] [ ] STATE: PA |NOTIFICATION TIME: 09:23 [ET]| |RX TYPE: [1] GE-4,[2] GE-4 |EVENT DATE: 06/17/94 | +------------------------------------------------+EVENT TIME: 06:01[EDT]| |NRC NOTIFIED BY: GREGORY F. COLLINS |LAST UPDATE DATE: 07/12/94 | |HQ OPS OFFICER: STEVE SANDIN +-----------------------------+ +------------------------------------------------+ NOTIFICATIONS | |EMERGENCY CLASS: NOT APPLICABLE +-----------------------------+ |10 CFR SECTION: |GENE KELLY 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 100 POWER OPERATION | 100 POWER OPERATION | | | | | | | | | +-----+---------------------------------------------+--------------------------+ EVENT TEXT +------------------------------------------------------------------------------+ | UNIT 1 EXPERIENCED A GROUP "6C" ISOLATION DUE TO A POSSIBLE RADIATION | | MONITORING INSTRUMENT SETPOINT DRIFT. | | | | "AT 0601 HOURS, THE UNIT ONE, DELTA CHANNEL OF THE REACTOR ENCLOSURE | | VENTILATION EXHAUST RADIATION MONITORING SYSTEM (RISH-026-1K609D) TRIPPED | | AND CAUSED A GROUP 6C ISOLATION. IT WAS VERIFIED BY MAIN CONTROL ROOM (MCR) | | PERSONNEL THAT NO HIGH RADIATION CONDITIONS EXISTED AND NO INCREASE WAS IN | | PROGRESS. NO TESTING OR MANIPULATIONS WERE BEING PERFORMED AT THE TIME. | | SYSTEMS AFFECTED BY THE ISOLATION WERE THE PRIMARY CONTAINMENT SAMPLING AND | | POST LOCA RECOMBINER. ALL EXPECTED ACTIONS WERE VERIFIED TO HAVE OCCURRED. | | I&C TECHNICIANS WERE CALLED TO INVESTIGATE. DURING THE PROCESS IT WAS | | VERIFIED ALL FUSES AND RELAYS ARE OPERABLE, HOWEVER THE HIGH/HIGH SETPOINT | | HAS DRIFTED DOWN AND THE ALARM BOARD ASSOCIATED WITH RISH-026-1K609D HAS | | BEEN PINPOINTED AS THE POSSIBLE CAUSE." | | | | THE GROUP "6C" ISOLATION SIGNAL WILL BE RESET FOLLOWING REPAIRS. THE | | LICENSEE INFORMED THE NRC RESIDENT INSPECTOR. | | | | * * * UPDATE 07/12/94 1125EDT FROM:NEFF BY:SCARFO * * * | | THE LICENSEE SUBMITTED A CLARIFICATION TO THIS EVENT. THE HIGH/HIGH | | SETPOINT DROPPED BELOW THE CURRENT PROCESS RADIATION LEVEL DURING THE | | EVENT. THE INVESTIGATION CONFIRMED THAT A FAILED ALARM CIRCUIT BOARD WAS | | THE CAUSE OF THIS EVENT. THE LICENSEE INFORMED THE NRC RESIDENT INSPECTOR. | | R1DO(SHANBAKY) NOTIFIED. | +------------------------------------------------------------------------------+ +----------------------------------+ +-----------------------+ |POWER REACTOR | |EVENT NUMBER: 27520 | +----------------------------------+ +-----------------------+ +------------------------------------------------+-----------------------------+ |FACILITY: CALVERT CLIFFS REGION: 1 |NOTIFICATION DATE: 07/11/94 | |UNIT: [ ] [2] [ ] STATE: MD |NOTIFICATION TIME: 13:20 [ET]| |RX TYPE: [1] CE,[2] CE |EVENT DATE: 07/11/94 | +------------------------------------------------+EVENT TIME: 12:30[EDT]| |NRC NOTIFIED BY: KENT MILLS |LAST UPDATE DATE: 07/12/94 | |HQ OPS OFFICER: DOUG WEAVER +-----------------------------+ +------------------------------------------------+ NOTIFICATIONS | |EMERGENCY CLASS: NOT APPLICABLE +-----------------------------+ |10 CFR SECTION: |MOHAMED SHANBAKY RDO | |ASHU 50.72(b)(1)(i)(A) PLANT S/D REQD BY TS | | | | | | | | | | | | | | +-----+----------+-------+--------+--------------+--+--------+-----------------+ |UNIT |SCRAM CODE|RX CRIT|INIT PWR| INIT RX MODE |CURR PWR| CURR RX MODE | +-----+----------+-------+--------+-----------------+--------+-----------------+ | | | | | 2 | N Y 100 POWER OPERATION | 97 POWER OPERATION | | | | | +-----+---------------------------------------------+--------------------------+ EVENT TEXT +------------------------------------------------------------------------------+ | SMALL LEAK (.15 GPM) ON A SAFETY INJECTION TANK TEST CONNECTION LINE | | | | THE PLANT COMMENCED SHUTDOWN AT 1315 EDT AT 25% PER HOUR BECAUSE OF RCS | | PRESSURE BOUNDARY LEAKAGE. THE LEAK WAS DISCOVERED DURING A CONTAINMENT | | ENTRY TO INVESTIGATE A HIGHER THAN NORMAL LEAKAGE RATE ON THE "A" SAFETY | | INJECTION TANK. THE LEAK IS ON A WELD ON THE 22A TEST CONNECTION LINE. THE | | TEST CONNECTION LINE IS A 3/4" LINE. THE LEAK IS CONSIDERED RCS PRESSURE | | BOUNDARY LEAKAGE EVEN THOUGH THE LEAKING WATER IS COMING FROM THE SAFETY | | INJECTION TANK. SAFETY INJECTION TANK PRESSURE IS ABOUT 215 PSIG. | | | | SOME ADDITIONAL SUPPORTS WERE ADDED TO THE INJECTION LINE DURING THE LAST | | REFUELING SHUTDOWN. THE PLANT IS ANALYZING THE POSSIBILITY OF FATIGUE | | FAILURE AS A CAUSE OF THE LEAK DUE TO THE INSTALLATION OF THESE SUPPORTS. | | | | THERE IS A DEENERGIZED OPEN MOV AND A CHECK VALVE BETWEEN THE LEAK AND THE | | RCS. THE PLANT IS REQUIRED TO BE IN HOT STANDBY WITH SIX HOURS AND COLD | | SHUTDOWN WITHIN THE NEXT 30 HOURS. REPAIR OPTIONS ARE BEING EVALUATED AT | | THIS TIME. | | | | THE LICENSEE HAS NOTIFIED THE NRC RESIDENT AND MADE A COURTESY CALL TO THE | | CALVERT CONTROL CENTER. | | | | * * * UPDATE 07/12/94 0254EDT FROM:SCHICK BY:SCARFO * * * | | THE UNIT IS STABLE IN MODE 3 (HOT STANDBY). THE LICENSEE PLANS TO | | PROCEEDING TO HOT SHUTDOWN, LEAVE TWO REACTOR COOLANT PUMPS IN SERVICE, | | ISOLATE THE LEAK (AND ASSOCIATED SIT), AND REPAIR THE LEAK. R1DO (SHANBAKY) | | NOTIFIED. | +------------------------------------------------------------------------------+ +----------------------------------+ +-----------------------+ |POWER REACTOR | |EVENT NUMBER: 27522 | +----------------------------------+ +-----------------------+ +------------------------------------------------+-----------------------------+ |FACILITY: COOPER REGION: 4 |NOTIFICATION DATE: 07/12/94 | |UNIT: [1] [ ] [ ] STATE: NE |NOTIFICATION TIME: 05:12 [ET]| |RX TYPE: [1] GE-4 |EVENT DATE: 07/12/94 | +------------------------------------------------+EVENT TIME: 02:45[CDT]| |NRC NOTIFIED BY: LAPLANT |LAST UPDATE DATE: 07/12/94 | |HQ OPS OFFICER: GREG SCARFO +-----------------------------+ +------------------------------------------------+ NOTIFICATIONS | |EMERGENCY CLASS: NOT APPLICABLE +-----------------------------+ |10 CFR SECTION: |STEWART 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 N 0 COLD SHUTDOWN | 0 COLD SHUTDOWN | | | | | | | | | +-----+---------------------------------------------+--------------------------+ EVENT TEXT +------------------------------------------------------------------------------+ | A REACTOR SCRAM SIGNAL AND A SHUTDOWN COOLING ISOLATION OCCURRED WHEN TWO | | OF FOUR CHANNELS OF LEVEL INSTRUMENTATION FAILED LOW. | | | | AT 0245CDT, A REACTOR SCRAM SIGNAL AND GROUP 2 (SHUTDOWN COOLING), GROUP 3 | | (REACTOR WATER CLEANUP), AND GROUP 6 (PRIMARY CONTAINMENT AND SECONDARY | | CONTAINMENT) ISOLATIONS OCCURRED WHEN TWO OF FOUR CHANNELS OF LEVEL | | INSTRUMENTATION FAILED LOW. THE LEVEL DOWN-SPIKE CAUSED "A" AND "B" | | CHANNEL INSTRUMENTATION TO REGISTER A LOW REACTOR WATER LEVEL OF 0 INCHES | | (NARROW RANGE), BELOW THE 4.5 INCH REACTOR SCRAM SETPOINT. AFTER THE | | SPIKE, THE AFFECTED INSTRUMENTS FAILED UPSCALE. ACTUAL VESSEL LEVEL | | REMAINED AT 50 INCHES THROUGHOUT THE EVENT. NO ROD MOTION OCCURRED DUE TO | | THE SCRAM SIGNAL. | | | | AT 0304CDT, SHUTDOWN COOLING WAS RETURNED TO SERVICE. REACTOR COOLANT | | SYSTEM TEMPERATURE INCREASED APPROXIMATELY 3 DEGREES, FROM 111 DEGREES F TO | | 114 DEGREES F (AS MEASURED AT THE INLET OF THE REACTOR WATER CLEANUP HEAT | | EXCHANGER). THE REMAINING ISOLATIONS WERE CLEARED, AS WELL, AND THE PLANT | | WAS RETURNED TO ITS NORMAL (COLD SHUTDOWN) CONFIGURATION. | | | | THE CAUSE OF THE FAILED LEVEL INSTRUMENTATION IS BELIEVED TO BE AIR BUBBLES | | IN THE REFERENCE LEGS OF THE LEVEL INSTRUMENTATION SYSTEM. NO MAINTENANCE | | OR REPAIRS WERE BEING PERFORMED ON THE SYSTEM AT THE TIME OF THE EVENT. AN | | INVESTIGATION TO CONFIRM THE CAUSE OF THE EVENT IS UNDERWAY. | | | | * * * UPDATE 07/12/94 1137EDT FROM:KAUL BY:SCARFO * * * | | THE INITIAL REFERENCE TO "0" INCHES WAS RELATIVE TO NARROW RANGE | | INDICATION. RELATIVE TO THE TOP-OF-ACTIVE FUEL, COOLANT LEVEL WAS 152 | | INCHES. THE LICENSEE INFORMED THE NRC RESIDENT INSPECTOR. | +------------------------------------------------------------------------------+ +----------------------------------+ +-----------------------+ |POWER REACTOR | |EVENT NUMBER: 27523 | +----------------------------------+ +-----------------------+ +------------------------------------------------+-----------------------------+ |FACILITY: SOUTH TEXAS REGION: 4 |NOTIFICATION DATE: 07/12/94 | |UNIT: [1] [2] [ ] STATE: TX |NOTIFICATION TIME: 13:54 [ET]| |RX TYPE: [1] W-4-LP,[2] W-4-LP |EVENT DATE: 07/11/94 | +------------------------------------------------+EVENT TIME: 16:00[CDT]| |NRC NOTIFIED BY: PINZON |LAST UPDATE DATE: 07/12/94 | |HQ OPS OFFICER: DOUG WEAVER +-----------------------------+ +------------------------------------------------+ NOTIFICATIONS | |EMERGENCY CLASS: NOT APPLICABLE +-----------------------------+ |10 CFR SECTION: |BLAINE MURRAY RDO | |NLTR LICENSEE 24 HR REPORT | | |NLCO TECH SPEC LCO A/S | | | | | | | | | | | +-----+----------+-------+--------+--------------+--+--------+-----------------+ |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 +------------------------------------------------------------------------------+ | SURVEILLANCE PROCEDURE INADEQUATE TO DETERMINE OPERABILITY OF INDICATIONS | | IN THE REMOTE SHUTDOWN AND ACCIDENT MONITORING SYSTEM. | | | | THE FOLLOWING IS THE TEXT OF A LICENSEE FAX. | | | | "AT APPROXIMATELY 1600 HOURS, ON JULY 11, 1994, AFTER EVALUATION OF THE | | REMOTE SHUTDOWN AND ACCIDENT MONITORING INSTRUMENT CHANNEL CHECK | | SURVEILLANCE PROCEDURE, FOR BOTH UNITS, IT WAS DETERMINED THAT THE | | SURVEILLANCES WERE INADEQUATE FOR PERFORMING A QUALITATIVE ASSESSMENT FOR | | NON-NUMERIC INDICATION CHANNELS. THE PROCEDURE DOES NOT ADEQUATELY PROVIDE | | A QUALITATIVE ACCEPTANCE CRITERIA TO DETERMINE THE DIFFERENCE BETWEEN | | OFF-SCALE AND CHANNEL INOPERABILITY. THIS APPLIES TO ALL CHANNELS CHECKS | | WHERE THE INDICATION READS ZERO, LESS THAN ZERO, HIGH OR ASTERISKS. | | | | THE SURVEILLANCES WERE RE-PERFORMED IN BOTH UNITS, FOR THE AFFECTED | | CHANNELS TO RE-EVALUATE WHETHER THE INDICATION WAS ADEQUATE FOR DETERMINING | | OPERABILITY. BASED ON THIS RE-PERFORMANCE, AT 1833 HOURS AND 1856 HOURS, | | IT WAS DETERMINED THAT ONE CHANNEL FOR THE UNIT 2 AND UNIT 1 CONTAINMENT | | SUMP WIDE RANGE WATER LEVEL WERE INOPERABLE. UPON DECLARATION OF THE | | INOPERABILITY OF THE CHANNEL, BOTH UNITS ENTERED INTO THE ACTION STATEMENT | | FOR LCO 3.3.3.6. THE CHANNEL OPERABILITY FOR WIDE RANGE WATER LEVEL, FOR | | BOTH UNITS ARE CURRENTLY BEING VERIFIED." | | | | FAILURE TO PERFORM AN ADEQUATE SURVEILLANCE IS REPORTABLE UNDER SECTION | | (2G) 2.C(2) OF THE LICENSE (24 HOUR REPORT). | | | | THE LICENSEE INFORMED THE NRC RESIDENT INSPECTOR. | +------------------------------------------------------------------------------+ +----------------------------------+ +-----------------------+ |POWER REACTOR | |EVENT NUMBER: 27524 | +----------------------------------+ +-----------------------+ +------------------------------------------------+-----------------------------+ |FACILITY: VERMONT YANKEE REGION: 1 |NOTIFICATION DATE: 07/12/94 | |UNIT: [1] [ ] [ ] STATE: VT |NOTIFICATION TIME: 16:14 [ET]| |RX TYPE: [1] GE-4 |EVENT DATE: 07/12/94 | +------------------------------------------------+EVENT TIME: 16:10[EDT]| |NRC NOTIFIED BY: MAY |LAST UPDATE DATE: 07/12/94 | |HQ OPS OFFICER: DOUG WEAVER +-----------------------------+ +------------------------------------------------+ NOTIFICATIONS | |EMERGENCY CLASS: NOT APPLICABLE +-----------------------------+ |10 CFR SECTION: |MOHAMED SHANBAKY RDO | |AARC 50.72(b)(1)(v) OTHER ASMT/COMM INOP | | |ANLI 50.72(b)(1)(iii) LIGHTNING | | | | | | | | | | | +-----+----------+-------+--------+--------------+--+--------+-----------------+ |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 +------------------------------------------------------------------------------+ | LOSS OF PLANT COMPUTER FOR GREATER THAN EIGHT HOURS | | | | REPAIRS WERE UNDERWAY ON THE PLANT COMPUTER (ERFIS) TO REPAIR DAMAGE | | INCURRED DURING THE WEEKEND'S LIGHTNING STORM WHICH ENTAILED TURNING OFF | | THE COMPUTER. THE COMPUTER COULD NOT BE RETURNED TO SERVICE AND WAS OUT OF | | SERVICE FOR EIGHT HOURS AS OF 1610 ON 7/12/94. THE LICENSEE IS EXPECTING | | HARDWARE TO BE DELIVERED TODAY TO REPAIR THE PROBLEM. | | | | THE LICENSEE HAS INFORMED THE VERMONT PUBLIC SERVICE DEPARTMENT AND WILL | | INFORM THE NRC RESIDENT INSPECTOR. | | | | | | * * * UPDATE BY MAY TAKEN BY WEAVER AT 1940 ON 7/12/94 * * * | | | | THE PLANT COMPUTER HAS BEEN RESTORED TO SERVICE. THE LICENSEE WILL INFORM | | THE NRC RESIDENT INSPECTOR. HOO NOTIFIED THE RDO (SHANBAKY) | +------------------------------------------------------------------------------+ +----------------------------------+ +-----------------------+ |POWER REACTOR | |EVENT NUMBER: 27525 | +----------------------------------+ +-----------------------+ +------------------------------------------------+-----------------------------+ |FACILITY: OYSTER CREEK REGION: 1 |NOTIFICATION DATE: 07/12/94 | |UNIT: [1] [ ] [ ] STATE: NJ |NOTIFICATION TIME: 22:48 [ET]| |RX TYPE: [1] GE-2 |EVENT DATE: 07/12/94 | +------------------------------------------------+EVENT TIME: 22:20[EDT]| |NRC NOTIFIED BY: CIGANIK |LAST UPDATE DATE: 07/12/94 | |HQ OPS OFFICER: DOUG WEAVER +-----------------------------+ +------------------------------------------------+ NOTIFICATIONS | |EMERGENCY CLASS: NOT APPLICABLE +-----------------------------+ |10 CFR SECTION: |MOHAMED SHANBAKY 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 | | | | | | | | | +-----+---------------------------------------------+--------------------------+ EVENT TEXT +------------------------------------------------------------------------------+ | OFFSITE NOTIFICATION | | | | THE LICENSEE NOTIFIED THE NATIONAL MARINE FISHERIES SERVICE THAT A DEAD | | KEMPS RIDLEY SEA TURTLE WAS DISCOVERED IN INTAKE BAY 4. THE LICENSEE WILL | | INFORM THE NRC RESIDENT INSPECTOR. | +------------------------------------------------------------------------------+