U.S. Nuclear Regulatory Commission Operations Center Event Reports For 12/07/95 - 12/08/95 ** EVENT NUMBERS ** 29649 29673 29681 29682 29683 29684 29685 +----------------------------------+ +-----------------------+ |OTHER NUCLEAR MATERIAL | |EVENT NUMBER: 29649 | +----------------------------------+ +-----------------------+ +------------------------------------------------+-----------------------------+ |LICENSEE: ATLANTIC GEOTECHNICAL SERVICES |NOTIFICATION DATE: 11/28/95 | | CITY: ASHLAND REGION: 2 |NOTIFICATION TIME: 13:17 [ET]| | COUNTY: STATE: VA |EVENT DATE: 11/28/95 | |LICENSE#: 45-25191-01 AGREEMENT: N |EVENT TIME: 00:32[EST]| | DOCKET: |LAST UPDATE DATE: 12/07/95 | | +-----------------------------+ | |PERSON ORGANIZATION| | |KERRY LANDIS (R2) RDO | | | | +------------------------------------------------+ | |NRC NOTIFIED BY: JINNY NOGGLE |ROGER HANNAH (R2) PAO | |HQ OPS OFFICER: LEIGH TROCINE | | +------------------------------------------------+ | |EMERGENCY CLASS: NOT APPLICABLE | | |10 CFR SECTION: | | |FLOM 20.402(a) THEFT/DIVERSION LNM | | | | | | | | | | | | | | +------------------------------------------------+-----------------------------+ EVENT TEXT +------------------------------------------------------------------------------+ | THEFT OF RADIOLOGICAL MATERIALS | | | | CALL BACK NUMBER: REFER TO THE OPERATIONS CENTER LOG FOR CONTACT NUMBERS | | | | ISOTOPE: AMERICIUM/BERYLLIUM-241 AND CESIUM-137 | | | | QUANTITY(Ci): 50 MILLICURIES AND 10 MILLICURIES, RESPECTIVELY | | | | CHEMICAL/PHYSICAL FORM: TWO SOURCES INSIDE AN MC3-SERIES CAMPBELL-PACIFIC | | MOISTURE DENSITY GAUGE (THE GAUGE WAS LABELLED WITH A RADIOACTIVE | | YELLOW-II LABEL.) | | | | DESCRIPTION OF CAUSE OF THE LOSS/THEFT: AT APPROXIMATELY 00:30 ON NOVEMBER | | 28, 1995, AN MC3-SERIES CAMPBELL-PACIFIC MOISTURE DENSITY GAUGE WAS STOLEN | | FROM THE BACK OF A TRUCK WHICH WAS PARKED IN FRONT OF A RESIDENCE IN | | HOPEWELL, VIRGINIA. THE GAUGE HAD BEEN SECURED TO THE TRUCK WITH A CHAIN | | AND PADLOCK. THE THEFT WAS REPORTED TO THE LICENSEE'S OFFICE AT | | APPROXIMATELY 06:00. | | | | ACTIONS TAKEN/PLANNED TO RECOVER THE MATERIAL: THE LICENSEE CONTACTED THE | | HOPEWELL POLICE DEPARTMENT (OFFICER FRANK RILEY) AT APPROXIMATELY 06:00, | | AND AN OFFICER (DETECTIVE STEVENS) HAS BEEN ASSIGNED TO THE CASE. THE FIRE | | MARSHALL (JAMES R. KUHNS) ALSO CALLED THE LICENSEE FOR INFORMATION | | REGARDING THIS EVENT. IN ADDITION, THE LICENSEE CONTACTED THE NRC REGION 2 | | OFFICE (JERRY D. ENNIS). THE LICENSEE MAY CONTACT THE LOCAL NEWS PAPER AND | | TELEVISION STATIONS AND MAY OFFER A REWARD FOR THE RETURN OF THE GAUGE. | | | | * * * 16:30 NOVEMBER 28, 1995, UPDATE FROM NOGGLE TAKEN BY TROCINE * * * | | | | ONE OF THE SOURCES WAS INTERNAL TO THE GAUGE, AND THE HANDLE FOR THE OTHER | | SOURCE WAS LOCKED IN PLACE. THE GAUGE WAS LOCKED IN THE BACK OF THE TRUCK | | WITH A LOCKED CABLE AND CHAIN, AND IT WAS COVERED UP. APPARENTLY, A | | NEIGHBOR HEARD NOISES AT APPROXIMATELY 02:00 AND WOKE UP THE INDIVIDUAL | | RESPONSIBLE FOR THE GAUGE. THE INDIVIDUAL THAN NOTICED THAT THE GAUGE WAS | | NO LONGER IN THE TRUCK. | | | | THE DOSE RATE IF THE SOURCE WAS UNSHIELDED WOULD BE 10 MILLIREM PER HOUR AT | | 3 FEET. | | | | THE NRC OPERATIONS CENTER NOTIFIED THE R2DO (LANDIS) AND THE R2PAO | | (HANNAH). | | | | * * * UPDATE 1801 12/07/95 FROM NOGGLE TAKEN BY STRANSKY * * * | | | | THE HOPEWELL POLICE DEPARTMENT HAS FOUND THE GAUGE ALONG THE SIDE OF A | | ROAD; HOWEVER, IT MAY BE DAMAGED. MR. NOGGLE REQUESTED ADVICE FROM NRC | | REGARDING ACTIONS TO BE TAKEN UPON HIS ARRIVAL AT THE SITE. THE HOO | | NOTIFIED THE R2DO (VERRELLI) AND R2 (MALLETT). MR. MALLETT CONTACTED MR. | | NOGGLE DIRECTLY. MR. PERLAS FROM STATE OF VIRGINIA ALSO CONTACTED THE | | OPERATIONS CENTER REGARDING THIS EVENT. MR. MALLETT CONTACTED MR. PERLAS. | +------------------------------------------------------------------------------+ !!!!!!!!! THIS EVENT HAS BEEN RETRACTED. THIS EVENT HAS BEEN RETRACTED !!!!!!! +----------------------------------+ +-----------------------+ |POWER REACTOR | |EVENT NUMBER: 29673 | +----------------------------------+ +-----------------------+ +------------------------------------------------+-----------------------------+ |FACILITY: MAINE YANKEE REGION: 1 |NOTIFICATION DATE: 12/06/95 | |UNIT: [1] [ ] [ ] STATE: ME |NOTIFICATION TIME: 03:31 [ET]| |RX TYPE: [1] CE |EVENT DATE: 12/06/95 | +------------------------------------------------+EVENT TIME: 02:31[EST]| |NRC NOTIFIED BY: JERRY MABEN |LAST UPDATE DATE: 12/07/95 | |HQ OPS OFFICER: LEIGH TROCINE +-----------------------------+ +------------------------------------------------+ NOTIFICATIONS | |EMERGENCY CLASS: NOT APPLICABLE +-----------------------------+ |10 CFR SECTION: |WALTER PASCIAK RDO | |DDDD 73.71 UNSPECIFIED PARAGRAPH | | |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 REFUELING | 0 REFUELING | | | | | | | | | +-----+---------------------------------------------+--------------------------+ EVENT TEXT +------------------------------------------------------------------------------+ | DISCOVERY OF MISPLACED SAFEGUARDS INFORMATION | | | | AT APPROXIMATELY 02:31, THE LICENSEE DISCOVERED MISPLACED SAFEGUARDS | | INFORMATION. IMMEDIATE COMPENSATORY MEASURES WERE TAKEN UPON DISCOVERY. | | (REFER TO THE HOO LOG FOR ADDITIONAL INFORMATION.) | | | | THE LICENSEE WILL NOTIFY THE NRC RESIDENT INSPECTOR AND THE STATE NUCLEAR | | SAFETY INSPECTOR. | | | | * * * UPDATE 1637 12/07/95 FROM WALDMAN TAKEN BY STRANSKY * * * | | | | THE LICENSEE IS RETRACTING THIS NOTIFICATION. A DETAILED INVESTIGATION OF | | THIS EVENT CONCLUDED THAT REPORTABILITY REQUIREMENTS WERE NOT MET AND THAT | | NO IMMEDIATE NOTIFICATION TO THE NRC WAS REQUIRED UNDER 10 CFR 73.71. THE | | NRC RESIDENT INSPECTOR HAS BEEN INFORMED BY THE LICENSEE. | +------------------------------------------------------------------------------+ +----------------------------------+ +-----------------------+ |POWER REACTOR | |EVENT NUMBER: 29681 | +----------------------------------+ +-----------------------+ +------------------------------------------------+-----------------------------+ |FACILITY: COOPER REGION: 4 |NOTIFICATION DATE: 12/07/95 | |UNIT: [1] [ ] [ ] STATE: NE |NOTIFICATION TIME: 00:09 [ET]| |RX TYPE: [1] GE-4 |EVENT DATE: 12/05/95 | +------------------------------------------------+EVENT TIME: 14:37[CST]| |NRC NOTIFIED BY: STEVE SMALLFOOT |LAST UPDATE DATE: 12/07/95 | |HQ OPS OFFICER: LEIGH TROCINE +-----------------------------+ +------------------------------------------------+ NOTIFICATIONS | |EMERGENCY CLASS: NOT APPLICABLE +-----------------------------+ |10 CFR SECTION: |TOM STETKA RDO | |NLTR LICENSEE 24 HR REPORT | | | | | | | | | | | | | | +-----+----------+-------+--------+--------------+--+--------+-----------------+ |UNIT |SCRAM CODE|RX CRIT|INIT PWR| INIT RX MODE |CURR PWR| CURR RX MODE | +-----+----------+-------+--------+-----------------+--------+-----------------+ | 1 | N N 0 COLD SHUTDOWN | 0 COLD SHUTDOWN | | | | | | | | | +-----+---------------------------------------------+--------------------------+ EVENT TEXT +------------------------------------------------------------------------------+ | INOPERABILITY OF THE FIRE SUPPRESSION SYSTEM DURING PREVENTATIVE | | MAINTENANCE AND FAILURE TO MAKE A 24-HOUR NOTIFICATION WITHIN THE REQUIRED | | TIME FRAME | | | | AT 14:37 CST ON DECEMBER 5, 1995, THE CONTROL SWITCHES FOR FIRE PUMPS 'D' | | AND 'E' WERE PLACED IN THE PULL-TO-LOCK POSITION IN ORDER TO ALLOW THE OIL | | TO BE CHANGED IN THE FIRE SYSTEM JOCKEY PUMP. BOTH OF THESE FIRE PUMPS | | WERE RETURNED TO SERVICE AT 17:15 CST ON DECEMBER 5, 1995. | | | | WHEN THE FIRE SUPPRESSION SYSTEM IS INOPERABLE, THE LICENSEE'S TECHNICAL | | SPECIFICATIONS REQUIRE THAT A 24-HOUR TELEPHONE NOTIFICATION BE MADE TO THE | | NRC. THIS REPORT WAS NOT MADE WITHIN THE REQUIRED 24-HOUR TIME FRAME. AS | | A RESULT, THE LICENSEE HAS GENERATED A CONDITION REPORT AND PLANS TO | | FORWARD THIS ISSUE TO MANAGEMENT FOR REVIEW. | | | | THE LICENSEE HAS INFORMED THE NRC RESIDENT INSPECTOR. | +------------------------------------------------------------------------------+ +----------------------------------+ +-----------------------+ |POWER REACTOR | |EVENT NUMBER: 29682 | +----------------------------------+ +-----------------------+ +------------------------------------------------+-----------------------------+ |FACILITY: BRAIDWOOD REGION: 3 |NOTIFICATION DATE: 12/07/95 | |UNIT: [1] [ ] [ ] STATE: IL |NOTIFICATION TIME: 04:21 [ET]| |RX TYPE: [1] W-4-LP,[2] W-4-LP |EVENT DATE: 12/07/95 | +------------------------------------------------+EVENT TIME: 02:40[CST]| |NRC NOTIFIED BY: MIKE BEBOARD |LAST UPDATE DATE: 12/07/95 | |HQ OPS OFFICER: LEIGH TROCINE +-----------------------------+ +------------------------------------------------+ NOTIFICATIONS | |EMERGENCY CLASS: NOT APPLICABLE +-----------------------------+ |10 CFR SECTION: |ROGER LANKSBURY 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 | M/R N 0 HOT STANDBY | 0 HOT STANDBY | | | | | | | | | +-----+---------------------------------------------+--------------------------+ EVENT TEXT +------------------------------------------------------------------------------+ | MANUAL REACTOR TRIP WHILE IN MODE 3 DUE TO A ROD CONTROL URGENT FAILURE | | DURING TESTING | | | | PRIOR TO THIS EVENT, THE UNIT WAS IN MODE 3 AT NORMAL OPERATING TEMPERATURE | | AND PRESSURE, AND THE ROD CONTROL SYSTEM WAS BEING TESTED IN PREPARATION | | FOR ROD DROP TESTING. AFTER SHUTDOWN BANK 'E' WAS WITHDRAWN 50 STEPS, A | | ROD CONTROL URGENT FAILURE OCCURRED. THIS RESULTED IN THE LOSS OF THE | | ABILITY TO MANUALLY STEP THE CONTROL RODS. AS A RESULT, THE LICENSEE | | MANUALLY OPENED THE REACTOR TRIP BREAKERS TO ALLOW THE RODS TO FULLY INSERT | | INTO THE CORE. (THIS WAS NOT A REQUIRED ACTION BUT WAS PERFORMED AS A | | CONSERVATIVE MEASURE TO FACILITATE ROD CONTROL SYSTEM REPAIRS.) ALL RODS | | FULLY INSERTED. A FEEDWATER ISOLATION WAS RECEIVED (AS EXPECTED FROM THE | | MANUAL OPENING OF THE REACTOR TRIP BREAKERS) AND WAS SUBSEQUENTLY RESET. | | ALL SYSTEMS FUNCTIONED AS REQUIRED. THE LICENSEE IS CURRENTLY PLANNING TO | | TROUBLESHOOT AND REPAIR THE FAILURE. | | | | THE UNIT IS CURRENTLY STABLE IN MODE 3. THE LICENSEE IS USING PRESSURIZER | | HEATERS AND SPRAYS, NORMAL CHARGING AND MAKEUP, AND REACTOR COOLANT PUMPS | | FOR PRIMARY PRESSURE, INVENTORY, AND TRANSPORT CONTROL. NORMAL FEEDWATER | | IS BEING SUPPLIED TO THE STEAM GENERATORS, AND SECONDARY STEAM IS BEING | | DUMPED TO THE CONDENSER. | | | | THE LICENSEE NOTIFIED THE NRC RESIDENT INSPECTOR. | +------------------------------------------------------------------------------+ +----------------------------------+ +-----------------------+ |POWER REACTOR | |EVENT NUMBER: 29683 | +----------------------------------+ +-----------------------+ +------------------------------------------------+-----------------------------+ |FACILITY: BRAIDWOOD REGION: 3 |NOTIFICATION DATE: 12/07/95 | |UNIT: [1] [ ] [ ] STATE: IL |NOTIFICATION TIME: 13:58 [ET]| |RX TYPE: [1] W-4-LP,[2] W-4-LP |EVENT DATE: 12/07/95 | +------------------------------------------------+EVENT TIME: 10:32[CST]| |NRC NOTIFIED BY: RICHARD |LAST UPDATE DATE: 12/07/95 | |HQ OPS OFFICER: BOB STRANSKY +-----------------------------+ +------------------------------------------------+ NOTIFICATIONS | |EMERGENCY CLASS: NOT APPLICABLE +-----------------------------+ |10 CFR SECTION: |LANKSBURY 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 N 0 HOT STANDBY | 0 HOT STANDBY | | | | | | | | | +-----+---------------------------------------------+--------------------------+ EVENT TEXT +------------------------------------------------------------------------------+ | MANUAL REACTOR TRIP DURING DIGITAL ROD POSITION INDICATION SYSTEM TESTING | | | | THE FOLLOWING IS TEXT OF A FACSIMILE SUBMITTED BY THE LICENSEE: | | | | "UNIT 1 WAS IN MODE 3 AT NORMAL OPERATING TEMPERATURE AND PRESSURE. THE | | DIGITAL ROD POSITION INDICATION OPERABILITY VERIFICATION PRIOR TO AND | | DURING ROD DROP TESTING DAILY SURVEILLANCE WAS BEING PERFORMED. WHILE | | BEGINNING WITHDRAWAL OF SHUTDOWN BANK "A", ROD D-2 FAILED TO WITHDRAW. WITH | | THE REMAINING BANK RODS AT 10 STEPS, THE DECISION WAS MADE TO OPEN THE | | REACTOR TRIP BREAKERS TO ALLOW THE RODS TO FULLY INSERT INTO THE CORE. THIS | | WAS NOT REQUIRED BY ANY TECHNICAL SPECIFICATIONS BUT WAS DONE AS A | | CONSERVATIVE ACTION TO ALLOW REPAIR OF THE ROD CONTROL SYSTEM. | | TROUBLESHOOTING OF THE ROD CONTROL SYSTEM IS IN PROGRESS." | | | | THE NRC RESIDENT INSPECTOR HAS BEEN INFORMED OF THIS EVENT BY THE LICENSEE. | +------------------------------------------------------------------------------+ +----------------------------------+ +-----------------------+ |POWER REACTOR | |EVENT NUMBER: 29684 | +----------------------------------+ +-----------------------+ +------------------------------------------------+-----------------------------+ |FACILITY: BRAIDWOOD REGION: 3 |NOTIFICATION DATE: 12/07/95 | |UNIT: [1] [ ] [ ] STATE: IL |NOTIFICATION TIME: 22:02 [ET]| |RX TYPE: [1] W-4-LP,[2] W-4-LP |EVENT DATE: 12/07/95 | +------------------------------------------------+EVENT TIME: 17:59[CST]| |NRC NOTIFIED BY: BAL |LAST UPDATE DATE: 12/07/95 | |HQ OPS OFFICER: BOB STRANSKY +-----------------------------+ +------------------------------------------------+ NOTIFICATIONS | |EMERGENCY CLASS: NOT APPLICABLE +-----------------------------+ |10 CFR SECTION: |LANKSBURY 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 N 0 HOT STANDBY | 0 HOT STANDBY | | | | | | | | | +-----+---------------------------------------------+--------------------------+ EVENT TEXT +------------------------------------------------------------------------------+ | MANUAL REACTOR TRIPS DURING AUTOMATED CONTROL ROD DROP TESTING. | | | | THE FOLLOWING IS TEXT OF A FACSIMILE SUBMITTED BY THE LICENSEE: | | | | "UNIT 1 WAS IN MODE 3 AT NORMAL OPERATING TEMPERATURE AND PRESSURE. | | | | DURING THE PERFORMANCE OF BWVS 1.3.4-1a (AUTOMATIC ROD DROPS), CONTROL BANK | | D RODS (5 RODS) WERE FULLY WITHDRAWN FOR THE PERFORMANCE OF ROD DROP | | TESTING. THE AUTO ROD DROP TESTING EQUIPMENT UTILIZES A COMPUTER AND | | CONTROL UNIT TO CONTROL RELAYS INSTALLED IN THE ROD CONTROL POWER CABINETS. | | THESE RELAYS ARE UTILIZED TO DROP RODS WHEN A SIGNAL IS SENT TO THEM. WHEN | | A ROD DROP SIGNAL WAS INITIATED FROM THE COMPUTER AND CONTROL UNIT, THE | | RELAY TO DROP RODS D12, M04, AND H08 DIDN'T APPEAR TO CHANGE STATE. THE | | RODS STAYED AT 231 STEPS. THE OTHER TWO RODS IN CONTROL BANK D (D04, M12) | | DID DROP AS EXPECTED. AT 1759 ON 12/7/95 THE TRIP BREAKERS WERE MANUALLY | | OPENED AS A CONSERVATIVE MEASURE IN ACCORDANCE WITH THE PRECAUTIONS | | DISCUSSED PRIOR TO PROCEDURE PERFORMANCE. THIS WAS NOT REQUIRED BY ANY | | TECHNICAL SPECIFICATIONS. | | | | A SUBSEQUENT INVESTIGATION REVEALED THAT THE RELAY CONTACTS USED TO SIGNAL | | THE START OF THE ROD DROP SEQUENCE DID CHANGE STATE. THE PROBLEM APPEARS | | TO BE A SIGNAL LINE ON THE STATIONARY REGULATION CARD WHICH IS USED FOR ROD | | CONTROL TESTING ONLY. | | | | AFTER IDENTIFICATION OF THE ABOVE PROBLEM, AN AUTOMATIC ROD DROP TEST WAS | | ATTEMPTED ON THE SHUTDOWN BANK C RODS. THE RODS WERE WITHDRAWN TO 231 | | STEPS, AND A ROD DROP SIGNAL WAS INITIATED. ONE RELAY FOR SHUTDOWN BANK C | | FAILED TO OPERATE RESULTING IN FAILURE TO DEENERGIZE THE MOVABLE GRIPPER | | COILS WHICH HELD THE RODS AT 231 STEPS. AGAIN, THE REACTOR TRIP BREAKERS | | WERE MANUALLY OPENED AT 1935 ON 12/7/95 AS A CONSERVATIVE MEASURE IN | | ACCORDANCE WITH THE PRECAUTIONS DISCUSSED PRIOR TO PROCEDURE PERFORMANCE. | | THE FAILED RELAY FOR SHUTDOWN BANK C IS ONLY USED FOR ROD DROP TESTING. | | | | THIS IS THE FIRST TIME THAT THE AUTOMATIC ROD DROP TESTING HAS BEEN | | PERFORMED ON UNIT 1. IN THE PAST MANUAL ROD DROP TESTING HAS BEEN | | PERFORMED." | | | | THE NRC RESIDENT INSPECTOR HAS BEEN INFORMED OF THIS EVENT BY THE LICENSEE. | +------------------------------------------------------------------------------+ +----------------------------------+ +-----------------------+ |POWER REACTOR | |EVENT NUMBER: 29685 | +----------------------------------+ +-----------------------+ +------------------------------------------------+-----------------------------+ |FACILITY: COOK REGION: 3 |NOTIFICATION DATE: 12/08/95 | |UNIT: [1] [ ] [ ] STATE: MI |NOTIFICATION TIME: 01:15 [ET]| |RX TYPE: [1] W-4-LP,[2] W-4-LP |EVENT DATE: 12/07/95 | +------------------------------------------------+EVENT TIME: 22:35[EST]| |NRC NOTIFIED BY: BOB HEATHCOTE |LAST UPDATE DATE: 12/08/95 | |HQ OPS OFFICER: LEIGH TROCINE +-----------------------------+ +------------------------------------------------+ NOTIFICATIONS | |EMERGENCY CLASS: NOT APPLICABLE +-----------------------------+ |10 CFR SECTION: |ROGER LANKSBURY 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 | M/R Y 32 POWER OPERATION | 0 HOT STANDBY | | | | | | | | | +-----+---------------------------------------------+--------------------------+ EVENT TEXT +------------------------------------------------------------------------------+ | MANUAL REACTOR TRIP DUE TO HIGH TURBINE BEARING VIBRATIONS | | | | AS PART OF A PLANNED EVOLUTION, OPERATORS WERE DECREASING REACTOR POWER | | FROM 71% TO 7% TO REMOVE THE TURBINE GENERATOR FROM SERVICE FOR REPAIRS TO | | THE MAIN TRANSFORMER AND ELECTRO-HYDRAULIC CONTROL SYSTEMS. AT | | APPROXIMATELY 49% REACTOR POWER AND COINCIDING WITH THE REMOVAL OF THE | | MOISTURE SEPARATOR REHEATER STEAM SUPPLIES, MAIN TURBINE BEARING #5 | | VIBRATION STARTED TO INCREASE. ATTEMPTS TO REDUCE THE VIBRATION BY | | CHANGING OIL TEMPERATURES, MOISTURE SEPARATOR REHEATER STEAM PRESSURES, AND | | TURBINE LOAD WERE UNSUCCESSFUL. WHEN THE #5 BEARING RIGHT AND LEFT SIDE | | VIBRATION INDICATORS READ 13 MILS AND 7 MILS VIBRATION AND INCREASING, | | RESPECTIVELY, A REACTOR TRIP WAS ORDERED BY THE UNIT SUPERVISOR. AS A | | RESULT, THE REACTOR WAS MANUALLY TRIPPED FROM 32% POWER AT 22:35. (AN | | AUTOMATIC TURBINE TRIP, WHICH WOULD HAVE CAUSED AN AUTOMATIC REACTOR TRIP, | | WOULD HAVE OCCURRED IF ONE LEFT AND ONE RIGHT VIBRATION INDICATOR HAD | | EXCEEDED 12 MILS.) ALL RODS FULLY INSERTED ON THE MANUAL REACTOR TRIP, AND | | ALL SYSTEMS FUNCTION AS REQUIRED. MAIN FEEDWATER ISOLATED, AND AUXILIARY | | FEEDWATER AUTOMATICALLY INITIATED AS EXPECTED. | | | | THE UNIT IS CURRENTLY STABLE IN MODE 3. PRESSURIZER HEATERS AND SPRAYS, | | NORMAL CHARGING AND MAKEUP, AND THE REACTOR COOLANT PUMPS ARE BEING USED | | FOR PRIMARY PRESSURE, INVENTORY, AND TRANSPORT CONTROL. AUXILIARY | | FEEDWATER IS BEING SUPPLIED TO THE STEAM GENERATORS, AND SECONDARY STEAM IS | | BEING DUMPED TO THE CONDENSER. UNIT RESTART IS CURRENTLY SCHEDULED FOR | | DECEMBER 10, 1995. | | | | THE LICENSEE HAS NOTIFIED THE NRC RESIDENT INSPECTOR. | +------------------------------------------------------------------------------+