U.S. Nuclear Regulatory Commission Operations Center Event Reports For 08/14/95 - 08/15/95 ** EVENT NUMBERS ** 29093 29186 29187 29194 29195 29196 29197 29198 !!!!!!!!! THIS EVENT HAS BEEN RETRACTED. THIS EVENT HAS BEEN RETRACTED !!!!!!! +----------------------------------+ +-----------------------+ |POWER REACTOR | |EVENT NUMBER: 29093 | +----------------------------------+ +-----------------------+ +------------------------------------------------+-----------------------------+ |FACILITY: BEAVER VALLEY REGION: 1 |NOTIFICATION DATE: 07/20/95 | |UNIT: [ ] [2] [ ] STATE: PA |NOTIFICATION TIME: 18:52 [ET]| |RX TYPE: [1] W-3-LP,[2] W-3-LP |EVENT DATE: 07/20/95 | +------------------------------------------------+EVENT TIME: 18:00[EDT]| |NRC NOTIFIED BY: KLINE |LAST UPDATE DATE: 08/14/95 | |HQ OPS OFFICER: TIM McGINTY +-----------------------------+ +------------------------------------------------+ NOTIFICATIONS | |EMERGENCY CLASS: NOT APPLICABLE +-----------------------------+ |10 CFR SECTION: |FRANK COSTELLO RDO | |DDDD 73.71 UNSPECIFIED PARAGRAPH |EDWARD BUTCHER EO | | | | | |McPEEK IAT | | | | | | | +-----+----------+-------+--------+--------------+--+--------+-----------------+ |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 +------------------------------------------------------------------------------+ | POTENTIAL TAMPERING WITH SAFETY RELATED EQUIPMENT. IMMEDIATE COMPENSATORY | | MEASURES TAKEN UPON DISCOVERY. THE LICENSEE HAS INFORMED THE RESIDENT | | INSPECTOR. SEE HOO LOG FOR DETAILS. | | | | * * * RETRACTION @ 11:09 8/14/95 FROM DULICK TAKEN BY SEBROSKY * * * | | | | THE LICENSEE IS RETRACTING THE EVENT BASED ON RESULTS OF ITS INVESTIGATIONS | | WHICH SHOW THAT NO TAMPERING OCCURRED AND THAT THE PROBLEM WAS DUE TO POOR | | WORKER PRACTICES. THE LICENSEE WILL REPORT THIS EVENT UNDER 10 CFR 50.73 | | (i.e. LER) BECAUSE OF THE EFFECT THE PROBLEM HAD ON THE SAFETY-RELATED | | EQUIPMENT. THE LICENSEE HAS INFORMED THE RESIDENT INSPECTOR. HOO NOTIFIED | | R1DO (JOYNER). | +------------------------------------------------------------------------------+ +----------------------------------+ +-----------------------+ |POWER REACTOR | |EVENT NUMBER: 29186 | +----------------------------------+ +-----------------------+ +------------------------------------------------+-----------------------------+ |FACILITY: DRESDEN REGION: 3 |NOTIFICATION DATE: 08/11/95 | |UNIT: [ ] [2] [3] STATE: IL |NOTIFICATION TIME: 18:55 [ET]| |RX TYPE: [1] GE-1,[2] GE-3,[3] GE-3 |EVENT DATE: 08/11/95 | +------------------------------------------------+EVENT TIME: 16:12[CDT]| |NRC NOTIFIED BY: MIKE McDONALD |LAST UPDATE DATE: 08/14/95 | |HQ OPS OFFICER: LEIGH TROCINE +-----------------------------+ +------------------------------------------------+ NOTIFICATIONS | |EMERGENCY CLASS: NOT APPLICABLE +-----------------------------+ |10 CFR SECTION: |MICHAEL J. JORDAN RDO | |APRE 50.72(b)(2)(vi) OFFSITE NOTIFICATION | | | |PHIL HARRELL RDO | | | | | | | | | | +-----+----------+-------+--------+--------------+--+--------+-----------------+ |UNIT |SCRAM CODE|RX CRIT|INIT PWR| INIT RX MODE |CURR PWR| CURR RX MODE | +-----+----------+-------+--------+-----------------+--------+-----------------+ | | | | | 2 | N N 0 REFUELING | 0 REFUELING | | 3 | N N 0 COLD SHUTDOWN | 0 COLD SHUTDOWN | +-----+---------------------------------------------+--------------------------+ EVENT TEXT +------------------------------------------------------------------------------+ | STATE NOTIFICATION OF A POSSIBLE LOSS OF A RADIOACTIVE SOURCE FROM A | | RADIATION DETECTOR UNDERGOING REPAIR AT A FACILITY IN NEBRASKA. | | | | THE LICENSEE NOTIFIED THE NEBRASKA DIVISION OF RADIOLOGICAL HEALTH, STATE | | DEPARTMENT OF HEALTH, OF A POSSIBLE LOSS OF A RADIOACTIVE SOURCE FROM A | | RADIATION DETECTOR UNDERGOING REPAIR AT A FACILITY (INTEGRATED RESOURCES) | | IN NEBRASKA CITY. THE SOURCE IS A 0.020 æCi, STRONTIUM-90, BETA EMITTER. | | THIS IS WELL BELOW THE 10 CFR 30.71, SCHEDULE B, LIMIT OF 0.1 æCi AND IS, | | THEREFORE, EXEMPT FROM LICENSING FROM AN NRC PERSPECTIVE. THE LICENSEE WAS | | NOTIFIED OF THIS INCIDENT AT 1900 ON AUGUST 10, 1995, BY THE VENDOR. | | | | IN JUNE 1994, TWENTY AREA RADIATION MONITORS WERE SHIPPED TO THE VENDOR FOR | | REPAIR. ALL RADIOACTIVE SOURCES WERE BELIEVED TO BE REMOVED FROM THE | | DETECTOR PRIOR TO SHIPMENT. HOWEVER, THIS CANNOT BE VERIFIED AT THIS TIME, | | AND THERE IS AT LEAST SOME CHANCE THAT ALL SOURCES WERE NOT REMOVED PRIOR | | TO SHIPMENT. THE PROBLEM WAS DISCOVERED WHEN AN OBJECT FELL FROM THE AREA | | OF THE DETECTOR THAT ORIGINALLY CONTAINED THE 0.02 æCi STRONTIUM-90 SOURCE, | | AND A WORKER WAS CONCERNED THAT THE OBJECT MAY HAVE BEEN A RADIOACTIVE | | SOURCE. THE OBJECT COULD NOT BE LOCATED BY THE WORKER, AND THE WORK AREA | | WAS SUBSEQUENTLY ISOLATED. | | | | THE LICENSEE DISPATCHED A CORPORATE HEALTH PHYSICIST TO INTEGRATED | | RESOURCES TO PROVIDE FOLLOWUP RADIATION SURVEYS. THIS REPRESENTATIVE IS | | EXPECTED TO ARRIVE LATE THIS EVENING, AND SURVEYS OF THE FACILITY ARE | | EXPECTED TO OCCUR EARLY TOMORROW. ANY SOURCES FOUND WILL BE TAKEN BY THE | | LICENSEE REPRESENTATIVE AND RETURNED TO DRESDEN NUCLEAR POWER STATION. | | | | THE LICENSEE INFORMED THE NRC RESIDENT INSPECTOR. | | | | * * * * 1704 AUGUST 14, 1995, UPDATE FROM VERCELLI TAKEN BY TROCINE * * * * | | | | THE FOLLOWING TEXT IS A PORTION OF A FACSIMILE RECEIVED BY THE LICENSEE: | | | | "ON 8/13 AT ABOUT 1300, DRESDEN STATION WAS NOTIFIED BY A CORPORATE HEALTH | | PHYSICIST THAT A THOROUGH SURVEY HAD BEEN COMPLETED AT THE NEBRASKA | | FACILITY. NO LOOSE SOURCE WAS FOUND. UPON INSPECTING THE DETECTOR IN | | QUESTION, A FIBERGLASS CONNECTOR FELL OUT OF THE ASSEMBLY. PART OF THE | | CONNECTOR WAS MISSING. IT IS BELIEVED THAT THE ITEM THAT HAD BEEN IN | | QUESTION ON 8/10 WAS LIKELY A PIECE OF THE CONNECTOR. | | | | A SURVEY WAS CONDUCTED ON THE REMAINING 19 DETECTORS. ONE MONITOR DID | | STILL CONTAIN A 0.02 æCi Sr-90 SOURCE GLUED TO THE DETECTOR PROBE HOUSING | | (READING 20,000 CPM DIRECT). AFTER REMOVING THE SOURCE, RESIDUAL | | CONTAMINATION FROM THE SOURCE WAS FOUND ON THE PROBE HOUSING (3000 DPM | | DIRECT). A SECOND DETECTOR PROBE HOUSING READ 3K DPM/100CMý THOUGH UPON | | REMOVAL OF THE CONTAMINATED TAPE AND GLUE, NO CONTAMINATION WAS DETECTED. A | | THIRD DETECTOR WAS FOUND TO CONTAIN CONTAMINATION ON THE BASE PLATE (1K DPM | | DIRECT) AND IN THE NUTS, BOLTS, AND GASKET WHICH CONNECTED THE MONITOR TO | | THE MONITOR HOUSING (3K DPM DIRECT) WITH NO LOOSE SURFACE CONTAMINATION | | DETECTED. ALL OTHER DETECTORS WERE DISMANTLED COMPLETELY AND WERE FREE OF | | CONTAMINATION AND SOURCE MATERIAL. | | | | ALL RADIOACTIVE MATERIAL HAS BEEN SHIPPED BACK TO DRESDEN STATION ON AUGUST | | 14 NEXT DAY DELIVERY." | | | | THE LICENSEE NOTIFIED THE NRC RESIDENT INSPECTOR AND THE STATE AND LOCAL | | OFFICIALS. THE NRC OPERATIONS OFFICE NOTIFIED THE R3DO (WRIGHT) AND THE | | R4DO (CAIN). | +------------------------------------------------------------------------------+ !!!!!!!!! THIS EVENT HAS BEEN RETRACTED. THIS EVENT HAS BEEN RETRACTED !!!!!!! +----------------------------------+ +-----------------------+ |POWER REACTOR | |EVENT NUMBER: 29187 | +----------------------------------+ +-----------------------+ +------------------------------------------------+-----------------------------+ |FACILITY: INDIAN POINT REGION: 1 |NOTIFICATION DATE: 08/12/95 | |UNIT: [2] [ ] [ ] STATE: NY |NOTIFICATION TIME: 10:26 [ET]| |RX TYPE: [2] W-4-LP,[3] W-4-LP |EVENT DATE: 08/12/95 | +------------------------------------------------+EVENT TIME: 09:28[EDT]| |NRC NOTIFIED BY: CHRIS MASSARO |LAST UPDATE DATE: 08/14/95 | |HQ OPS OFFICER: JOSEPH SEBROSKY +-----------------------------+ +------------------------------------------------+ NOTIFICATIONS | |EMERGENCY CLASS: NOT APPLICABLE +-----------------------------+ |10 CFR SECTION: |JAMES JOYNER RDO | |DDDD 73.71 UNSPECIFIED PARAGRAPH | | | | | | | | | | | | | | +-----+----------+-------+--------+--------------+--+--------+-----------------+ |UNIT |SCRAM CODE|RX CRIT|INIT PWR| INIT RX MODE |CURR PWR| CURR RX MODE | +-----+----------+-------+--------+-----------------+--------+-----------------+ | 2 | N Y 34 POWER OPERATION | 34 POWER OPERATION | | | | | | | | | +-----+---------------------------------------------+--------------------------+ EVENT TEXT +------------------------------------------------------------------------------+ | A KEY CHAIN THAT CONTAINED KEYS TO THE PROTECTED AND VITAL AREAS WAS | | TEMPORARILY LOST FOR APPROXIMATELY 34 MINUTES. THE KEYS HAVE SINCE BEEN | | RECOVERED, AND NO BREACHES IN SECURITY OCCURRED AS A RESULT OF THIS EVENT. | | COMPENSATORY MEASURES WERE TAKEN UPON DISCOVERY. SEE HOO LOG FOR DETAILS. | | | | THE LICENSEE WILL INFORM THE RESIDENT INSPECTOR. | | | | * * * RETRACTION 8/14/95 08:14 FROM SANTINI TAKEN BY SEBROSKY * * * | | | | THE LICENSEE HAS DETERMINED THAT THIS EVENT IS LOGGABLE AND DOES NOT MEET | | REPORTABILITY REQUIREMENTS AND IS, THEREFORE, RETRACTING THIS EVENT. THE | | LICENSEE WILL INFORM THE RESIDENT INSPECTOR. HOO NOTIFIED R1DO(JOYNER). | +------------------------------------------------------------------------------+ +----------------------------------+ +-----------------------+ |POWER REACTOR | |EVENT NUMBER: 29194 | +----------------------------------+ +-----------------------+ +------------------------------------------------+-----------------------------+ |FACILITY: OCONEE REGION: 2 |NOTIFICATION DATE: 08/14/95 | |UNIT: [ ] [ ] [3] STATE: SC |NOTIFICATION TIME: 06:25 [ET]| |RX TYPE: [1] B&W-L-LP,[2] B&W-L-LP,[3] B&W-L-LP |EVENT DATE: 08/14/95 | +------------------------------------------------+EVENT TIME: 04:56[EDT]| |NRC NOTIFIED BY: MARTY STASNY |LAST UPDATE DATE: 08/14/95 | |HQ OPS OFFICER: JOSEPH SEBROSKY +-----------------------------+ +------------------------------------------------+ NOTIFICATIONS | |EMERGENCY CLASS: NOT APPLICABLE +-----------------------------+ |10 CFR SECTION: |JEROME BLAKE RDO | |ARPS 50.72(b)(2)(ii) RPS ACTUATION | | | | | | | | | | | | | | +-----+----------+-------+--------+--------------+--+--------+-----------------+ |UNIT |SCRAM CODE|RX CRIT|INIT PWR| INIT RX MODE |CURR PWR| CURR RX MODE | +-----+----------+-------+--------+-----------------+--------+-----------------+ | | | | | | | | | 3 | A/R Y 100 POWER OPERATION | 0 HOT STANDBY | +-----+---------------------------------------------+--------------------------+ EVENT TEXT +------------------------------------------------------------------------------+ | AUTOMATIC REACTOR SCRAM DUE TO ONE GROUP OF CONTROL RODS DROPPING INTO THE | | CORE. | | | | THE GROUP OF RODS DROPPING INTO THE CORE CAUSED A VARIABLE LOW RCS PRESSURE | | TRIP SIGNAL WHICH CAUSED THE REST OF THE RODS TO INSERT. THE POST-TRIP | | RESPONSE WAS NORMAL. ALL RODS INSERTED, AND NO PRIMARY RELIEF VALVES OR | | PORVs OPENED. THE STEAM GENERATOR SAFETIES DID LIFT AND RESEAT AS A RESULT | | OF THE TRANSIENT. THE MAIN CONDENSER IS AVAILABLE AS A HEAT SINK, AND THE | | STEAM GENERATOR WATER LEVELS ARE BEING MAINTAINED BY THE NORMAL FEED | | SYSTEM. ALL BUSSES TRANSFERRED AS EXPECTED, AND ALL EMERGENCY POWER | | SUPPLIES ARE OPERABLE. | | | | THE LICENSEE IS INVESTIGATING THE CAUSE OF THE CONTROL RODS DROPPING INTO | | THE CORE. THE CONTROL ROD GROUP THAT DROPPED WAS GROUP 5. THE LICENSEE | | HAS INFORMED THE RESIDENT INSPECTOR. | +------------------------------------------------------------------------------+ +----------------------------------+ +-----------------------+ |GENERAL INFORMATION or OTHER | |EVENT NUMBER: 29195 | +----------------------------------+ +-----------------------+ +------------------------------------------------+-----------------------------+ |LICENSEE: US ENVIRONMENTAL PROTECTION AGENCY |NOTIFICATION DATE: 08/14/95 | | CITY: CHICAGO REGION: 3 |NOTIFICATION TIME: 16:21 [ET]| | COUNTY: STATE: IL |EVENT DATE: 08/10/95 | |LICENSE#: 12-10243-01 AGREEMENT: Y |EVENT TIME: 10:00[CDT]| | DOCKET: |LAST UPDATE DATE: 08/14/95 | | +-----------------------------+ | |PERSON ORGANIZATION| | |GEOFFREY WRIGHT RDO | | | | +------------------------------------------------+ | |NRC NOTIFIED BY: STEVE GURSKI | | |HQ OPS OFFICER: LEIGH TROCINE | | +------------------------------------------------+ | |EMERGENCY CLASS: NOT APPLICABLE | | |10 CFR SECTION: | | |BAB2 20.2201(a)(1)(ii) LOST/STOLEN LNM>10X | | | | | | | | | | | | | | +------------------------------------------------+-----------------------------+ EVENT TEXT +------------------------------------------------------------------------------+ | THE U.S. ENVIRONMENTAL PROTECTION AGENCY, REGION V, CENTRAL REGIONAL | | LABORATORY, LOCATED IN CHICAGO, ILLINOIS, DISCOVERED THE LOSS OF TWO | | 15-MILLICURIE, NICKEL-63, SEALED SOURCES. | | | | THE LICENSEE DISCOVERED THE LOSS OF TWO 15-MILLICURIE, NICKEL-63, SEALED | | SOURCES. APPARENTLY, THE GAS CHROMATOGRAPH THAT CONTAINED THESE SOURCES | | WAS PUT ON GOVERNMENT EXCESS IN 1992 AND WAS SENT TO BE SCRAPPED. THE | | LICENSEE HAS GONE BACK TO THE AGENCY THAT HANDLES THE EXCESS PROPERTY TO | | REVIEW ANY RECORDS THEY MAY HAVE REGARDING TRANSFER, CONTACTED THE | | MANUFACTURER IN HOPES THAT THE SOURCES WERE RECOVERED AND RETURNED WITHOUT | | DOCUMENTATION, LOOKED THROUGH THE LABORATORY, AND PERFORMED A PHYSICAL | | SEARCH OF THE INVENTORY AS WELL AS THE LABORATORY SPACES. | | | | THE LICENSEE NOTIFIED THE REGION III OFFICE AND PLANS TO NOTIFY THE STATE. | +------------------------------------------------------------------------------+ +----------------------------------+ +-----------------------+ |POWER REACTOR | |EVENT NUMBER: 29196 | +----------------------------------+ +-----------------------+ +------------------------------------------------+-----------------------------+ |FACILITY: WASHINGTON NUCLEAR REGION: 4 |NOTIFICATION DATE: 08/14/95 | |UNIT: [2] [ ] [ ] STATE: WA |NOTIFICATION TIME: 16:44 [ET]| |RX TYPE: [2] GE-5 |EVENT DATE: 08/14/95 | +------------------------------------------------+EVENT TIME: 12:43[PDT]| |NRC NOTIFIED BY: AL WARE |LAST UPDATE DATE: 08/14/95 | |HQ OPS OFFICER: LEIGH TROCINE +-----------------------------+ +------------------------------------------------+ NOTIFICATIONS | |EMERGENCY CLASS: NOT APPLICABLE +-----------------------------+ |10 CFR SECTION: |CHARLES CAIN RDO | |DUNE 73.71(b)(1) UNAUTHORIZED ENTRY | | | | | | | | | | | | | | +-----+----------+-------+--------+--------------+--+--------+-----------------+ |UNIT |SCRAM CODE|RX CRIT|INIT PWR| INIT RX MODE |CURR PWR| CURR RX MODE | +-----+----------+-------+--------+-----------------+--------+-----------------+ | 2 | N Y 69 POWER OPERATION | 69 POWER OPERATION | | | | | | | | | +-----+---------------------------------------------+--------------------------+ EVENT TEXT +------------------------------------------------------------------------------+ | UNAUTHORIZED ENTRY TO THE PROTECTED AREA THROUGH A PRIMARY ACCESS POINT | | THAT IS NO LONGER IN USE. | | | | IMMEDIATE COMPENSATORY ACTIONS WERE TAKEN UPON DISCOVERY. REFER TO THE HOO | | LOG FOR DETAILS. | | | | THE LICENSEE PLANS TO NOTIFY THE NRC RESIDENT INSPECTOR. | +------------------------------------------------------------------------------+ +----------------------------------+ +-----------------------+ |POWER REACTOR | |EVENT NUMBER: 29197 | +----------------------------------+ +-----------------------+ +------------------------------------------------+-----------------------------+ |FACILITY: DRESDEN REGION: 3 |NOTIFICATION DATE: 08/14/95 | |UNIT: [ ] [2] [3] STATE: IL |NOTIFICATION TIME: 17:04 [ET]| |RX TYPE: [1] GE-1,[2] GE-3,[3] GE-3 |EVENT DATE: 08/14/95 | +------------------------------------------------+EVENT TIME: 14:00[CDT]| |NRC NOTIFIED BY: STEVE VERCELLI |LAST UPDATE DATE: 08/14/95 | |HQ OPS OFFICER: LEIGH TROCINE +-----------------------------+ +------------------------------------------------+ NOTIFICATIONS | |EMERGENCY CLASS: NOT APPLICABLE +-----------------------------+ |10 CFR SECTION: |GEOFFREY WRIGHT 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 REFUELING | 0 REFUELING | | 3 | N N 0 COLD SHUTDOWN | 0 COLD SHUTDOWN | +-----+---------------------------------------------+--------------------------+ EVENT TEXT +------------------------------------------------------------------------------+ | NOTIFICATION OF THE STATE AND COUNTY OF UNACCEPTABLE LEVELS OF COLIFORM | | BACTERIA IN THE DRINKING WATER SUPPLY. | | | | LICENSEE CORPORATE ENVIRONMENTAL SERVICES PERSONNEL NOTIFIED THE STATE OF | | ILLINOIS DEPARTMENT OF PUBLIC HEALTH AND GRUNDY COUNTY OFFICIALS THAT THE | | DRESDEN DRINKING WATER SUPPLY HAD UNACCEPTABLE LEVELS OF COLIFORM BACTERIA. | | THE LICENSEE HAS POSTED THE WATER SUPPLIES AS NOT BEING FOR HUMAN | | CONSUMPTION AND IS INVESTIGATING THE CAUSE OF THE PROBLEM. | | | | THE LICENSEE NOTIFIED THE NRC RESIDENT INSPECTOR. | +------------------------------------------------------------------------------+ +----------------------------------+ +-----------------------+ |POWER REACTOR | |EVENT NUMBER: 29198 | +----------------------------------+ +-----------------------+ +------------------------------------------------+-----------------------------+ |FACILITY: PALISADES REGION: 3 |NOTIFICATION DATE: 08/15/95 | |UNIT: [1] [ ] [ ] STATE: MI |NOTIFICATION TIME: 05:11 [ET]| |RX TYPE: [1] CE |EVENT DATE: 08/15/95 | +------------------------------------------------+EVENT TIME: 03:39[EDT]| |NRC NOTIFIED BY: MARK HOLBEIN |LAST UPDATE DATE: 08/15/95 | |HQ OPS OFFICER: JOSEPH SEBROSKY +-----------------------------+ +------------------------------------------------+ NOTIFICATIONS | |EMERGENCY CLASS: NOT APPLICABLE +-----------------------------+ |10 CFR SECTION: | | |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 SHUTDOWN | | | | | | | | | +-----+---------------------------------------------+--------------------------+ EVENT TEXT +------------------------------------------------------------------------------+ | MANUAL REACTOR TRIP DURING CONTROL ROD DROP TIMING TEST DUE TO A LEAK ON A | | PRIMARY COOLANT SYSTEM FLOW INSTRUMENT. | | | | THE LEAK STARTED AT APPROXIMATELY 02:48 AND WAS ESTIMATED TO BE | | APPROXIMATELY 11 GPM. THE INDICATIONS OF THE LEAK WERE SMOKE DETECTORS | | ALARMING IN CONTAINMENT AND OPERATORS NOTICING THE LOWERING OF A READING | | FOR ONE OF THE PRIMARY COOLANT SYSTEM FLOW INSTRUMENTS. THE LOWERING | | READING OF THE PRIMARY COOLANT SYSTEM FLOW INSTRUMENT CAUSED ONE CHANNEL OF | | THE REACTOR PROTECTION SYSTEM TO TRIP. (THE FLOW SIGNAL SERVES AS AN INPUT | | TO THE RPS SYSTEM AND IS USED TO CAUSE A LOW FLOW SCRAM). | | | | AT THE TIME OF THE LEAK ALL RODS, WITH ONE EXCEPTION, WERE LATCHED AND AT | | THE 2.5 INCH POSITION. ONE ROD WAS BEING WITHDRAWN TO PERFORM SCRAM TIME | | TESTING. THE OPERATORS MANUALLY INSERTED THE PARTIALLY WITHDRAWN ROD BASED | | ON THE ABOVE INDICATIONS. | | | | IN PARALLEL WITH INSERTING THE ROD, AN OPERATOR WAS DISPATCHED TO ISOLATE | | THE ROOT VALVES FOR THE AFFECTED INSTRUMENT. DURING THE ISOLATION OF THE | | ROOT VALVES OPERATORS IN THE CONTROL ROOM RECEIVED INDICATIONS OF OTHER RPS | | CHANNELS (PRE-TRIPS) BEING AFFECTED. AT THIS TIME IT APPEARS THAT THE ROOT | | ISOLATION VALVES FOR THE INSTRUMENTATION WERE MIS-LABELED, CAUSING THE | | WRONG INSTRUMENT LINES TO BE ISOLATED. | | | | BASED ON THE INDICATIONS OF MULTIPLE RPS CHANNELS TRIPPING THE SHIFT | | SUPERVISOR ORDERED A MANUAL REACTOR SCRAM. ALL RODS WERE LATCHED AND AND | | AT THE 2.5 INCH POSITION AT THE TIME OF THIS ORDER. ALL RODS FULLY | | INSERTED ON THE SCRAM. | | | | THE LEAK LASTED FROM APPROXIMATELY 02:48 TO 04:07 AT WHICH TIME IT WAS | | ISOLATED. ALL EMERGENCY CORE COOLING SYSTEMS AND EMERGENCY DIESEL | | GENERATORS ARE OPERABLE. THE LICENSEE IS CONTINUING TO INVESTIGATE THE | | CAUSE OF THE PROBLEM. | | | | THE LICENSEE HAS INFORMED THE RESIDENT INSPECTOR. | +------------------------------------------------------------------------------+