U.S. Nuclear Regulatory Commission Operations Center Event Reports For 04/08/98 - 04/09/98 ** EVENT NUMBERS ** 33808 33935 34034 34035 34036 34037 34038 34039 !!!!!!!!! THIS EVENT HAS BEEN RETRACTED. THIS EVENT HAS BEEN RETRACTED !!!!!!! +----------------------------------+ +-----------------------+ |POWER REACTOR | |EVENT NUMBER: 33808 | +----------------------------------+ +-----------------------+ +------------------------------------------------+-----------------------------+ |FACILITY: VERMONT YANKEE REGION: 1 |NOTIFICATION DATE: 02/27/98 | |UNIT: [1] [ ] [ ] STATE: VT |NOTIFICATION TIME: 13:05 [ET]| |RX TYPE: [1] GE-4 |EVENT DATE: 02/27/98 | +------------------------------------------------+EVENT TIME: 12:45[EST]| |NRC NOTIFIED BY: DAVE HALLONQUIST |LAST UPDATE DATE: 04/08/98 | |HQ OPS OFFICER: DICK JOLLIFFE +-----------------------------+ +------------------------------------------------+ NOTIFICATIONS | |EMERGENCY CLASS: NOT APPLICABLE +-----------------------------+ |10 CFR SECTION: |CLIFFORD ANDERSON 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 | +-----+----------+-------+--------+-----------------+--------+-----------------+ | 1 | N Y 91 POWER OPERATION | 91 POWER OPERATION | | | | | | | | | +-----+---------------------------------------------+--------------------------+ EVENT TEXT +------------------------------------------------------------------------------+ | - POWER CABLE IS ROUTED THRU CONTROL POWER & INSTRUMENTATION CABLE TRAYS - | | | | AT 1245 ON 02/27/98, THE LICENSEE DISCOVERED DURING A PLANT WALKDOWN THAT | | NON-NUCLEAR SAFETY POWER CABLE #11322U IS ROUTED THROUGH BOTH 300 SERIES | | (CONTROL POWER) AND 400 SERIES (INSTRUMENTATION) NON-NUCLEAR SAFETY CABLE | | TRAYS. THIS ROUTING CONFIGURATION IS PROHIBITED BY UFSAR SECTION 8.4.6 | | AND PLANT DOCUMENT VYS-027, CABLE SEPARATION CRITERIA. CABLE #11322U | | PROVIDES POWER TO THE ALTERNATE SHUTDOWN TRANSFER SWITCH REFLASH | | ANNUNCIATORS IN CONTROL ROOM PANEL #CRP 9-21. CABLE #11322U WAS INSTALLED | | DURING A PLANT MODIFICATION (#EDCR 82-10/11/12) IN THE EARLY 1980s. | | | | THE LICENSEE IS INVESTIGATING THIS CONDITION AND DETERMINING CORRECTIVE | | ACTIONS. | | | | THE LICENSEE INFORMED THE NRC RESIDENT INSPECTOR. | | | | * * * RETRACTION 1538 4/8/1998 FROM EMPEY TAKEN BY STRANSKY * * * | | | | AFTER FURTHER REVIEW, THE LICENSEE HAS DETERMINED THAT THIS CONFIGURATION | | DID NOT AFFECT OR CHALLENGE ANY SAFETY SYSTEMS. THEREFORE, THE NOTIFICATION | | IS BEING RETRACTED. THE NRC RESIDENT INSPECTOR WILL BE INFORMED. NOTIFIED | | R1DO (MEYER). | +------------------------------------------------------------------------------+ !!!!!!!!! THIS EVENT HAS BEEN RETRACTED. THIS EVENT HAS BEEN RETRACTED !!!!!!! +----------------------------------+ +-----------------------+ |POWER REACTOR | |EVENT NUMBER: 33935 | +----------------------------------+ +-----------------------+ +------------------------------------------------+-----------------------------+ |FACILITY: HARRIS REGION: 2 |NOTIFICATION DATE: 03/21/98 | |UNIT: [1] [ ] [ ] STATE: NC |NOTIFICATION TIME: 02:10 [ET]| |RX TYPE: [1] W-3-LP |EVENT DATE: 03/21/98 | +------------------------------------------------+EVENT TIME: 01:40[EST]| |NRC NOTIFIED BY: M THOMAS |LAST UPDATE DATE: 04/08/98 | |HQ OPS OFFICER: JOHN MacKINNON +-----------------------------+ +------------------------------------------------+ NOTIFICATIONS | |EMERGENCY CLASS: NOT APPLICABLE +-----------------------------+ |10 CFR SECTION: |TOM JOHNSON RDO | |AESS 50.72(b)(1)(v) EMERGENCY SIREN INOP | | | | | | | | | | | | | | +-----+----------+-------+--------+--------------+--+--------+-----------------+ |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 +------------------------------------------------------------------------------+ | SEVERE THUNDERSTORMS CAUSED ALL THE EMERGENCY SIRENS IN LEE COUNTY TO | | BECOME INOPERABLE. | | | | THE MAIN CONTROL ROOM WAS NOTIFIED BY THE SYSTEM DISPATCHER THAT ALL SIRENS | | FOR LEE COUNTY HAD BEEN LOST. DURING THE EVENING, SEVERE THUNDER STORMS | | OCCURRED AND POSSIBLY LED TO THE SIREN LOSS. THE PLANT REMAINS AT 100% | | POWER WITH ALL SAFETY SYSTEMS FUNCTIONING NORMALLY AND OPERABLE. THE SYSTEM | | SERVICE CREW IS IN PROCESS OF REPAIRING THE SIRENS IN LEE COUNTY. ESTIMATED | | RESTORATION TIME IS NOT CURRENTLY AVAILABLE. | | | | THE NRC RESIDENT INSPECTOR WAS NOTIFIED OF THIS EVENT BY THE LICENSEE. | | | | ***UPDATE ON 03/21/98 @ 0417 BY JOE DAVIS TAKEN BY MACKINNON*** | | | | ALL EMERGENCY SIRENS IN LEE COUNTY WERE RESTORED TO SERVICE AT 0345. | | R2DO (TOM JOHNSON) NOTIFIED. | | | | THE NRC RESIDENT INSPECTOR WILL BE NOTIFIED OF THIS UPDATE BY THE LICENSEE. | | | | *** UPDATE ON 4/8/98 @ 0818 BY PALMER TO GOULD *** EVENT RETRACTION | | THE LICENSEE IS RETRACTING THIS EVENT SINCE THEY HAVE CONFIRMATION FROM THE | | CENTRAL ELECTRICAL MEMBERSHIP COOPERATIVE, WHICH PROVIDES POWER TO 5 OF THE | | SIRENS IN LEE COUNTY, THAT THERE WERE NO POWER OUTAGES DURING OR FOLLOWING | | THE STORMS WHICH WOULD HAVE AFFECTED THESE SIRENS. AS SUCH THE FULL | | ASSESSMENT OF SIREN CAPABILITY HAS DETERMINED THAT THE EVENT REPORTABILITY | | CRITERION WAS NOT MET. | | | | THE RESIDENT INSPECTOR WAS INFORMED. THE REG 2 RDO(SKINNER) WAS NOTIFIED. | +------------------------------------------------------------------------------+ +----------------------------------+ +-----------------------+ |FUEL CYCLE FACILITY | |EVENT NUMBER: 34034 | +----------------------------------+ +-----------------------+ +------------------------------------------------+-----------------------------+ |FACILITY: PADUCAH GASEOUS DIFFUSION PLANT |NOTIFICATION DATE: 04/08/98 | | RXTYPE: URANIUM ENRICHMENT FACILITY |NOTIFICATION TIME: 00:52 [ET]| |COMMENTS: 2 DEMOCRACY CENTER |EVENT DATE: 04/07/98 | | 6903 ROCKLEDGE DRIVE |EVENT TIME: 01:00[CDT]| | BETHESDA, MD 20817 (301)564-3200 |LAST UPDATE DATE: 04/08/98 | | CITY: PADUCAH REGION: 3 +-----------------------------+ | COUNTY: McCRACKEN STATE: KY |PERSON ORGANIZATION| |LICENSE#: GDP-1 AGREEMENT: Y |MARK RING RDO | | DOCKET: 0707001 |LARRY CAMPER EO | +------------------------------------------------+JOSEPH GIITTER IRD | |NRC NOTIFIED BY: HALICKS | | |HQ OPS OFFICER: CHAUNCEY GOULD | | +------------------------------------------------+ | |EMERGENCY CLASS: NOT APPLICABLE | | |10 CFR SECTION: | | |OCBA 76.120(c)(2)(i) ACCID MT EQUIP FAILS | | | | | | | | | | | | | | +------------------------------------------------+-----------------------------+ EVENT TEXT +------------------------------------------------------------------------------+ | CRITICALITY ACCIDENT ALARM SYSTEM (CAAS) IN THE "C-720" FACILITY INOPERABLE | | | | IT WAS DISCOVERED THAT THE CAAS IN THE "C-720" FACILITY WAS NOT ABLE TO | | PROVIDE THE REQUIRED ALARMS IN THE "C-300" CENTRAL CONTROL FACILITY(CCF). | | DURING PERFORMANCE OF THE QUARTERLY TSR-REQUIRED SURVEILLANCE, THE CAAS | | CLUSTER BEING TESTED FAILED TO GIVE THE 10mR LIGHT ON THE ALARM CONSOLE IN | | THE CCF WHICH SHOWS ACTIVATION OF THE CLUSTER. THE ALARM HORNS AND LIGHTS | | IN THE CAAS-ALARMED AREA FUNCTIONED AS REQUIRED. | | | | UNDER THE PLAN WHICH WAS DEVELOPED TO BRING THE PLANT INTO COMPLIANCE WITH | | NRC REGULATIONS, ISSUE NO.50 ADDRESSES UNALARMED BUILDINGS WITHIN THE | | EVACUATION AREA OF CAAS-ALARMED FACILITIES. PERSONNEL ENTERING THOSE | | FACILITIES ARE REQUIRED TO CARRY A RADIO CAPABLE OF RECEIVING EMERGENCY | | ANNOUNCEMENTS. IN THE EVENT OF A CAAS ACTIVATION, THE OPERATOR IN THE CCF | | USES THE 10mR LIGHT AS VERIFICATION OF THE POSSIBLE OCCURRENCE OF A | | CRITICALITY AND MAKES AN ANNOUNCEMENT REGARDING THE ALARM OVER THE PLANT | | "ALL CALL" PUBLIC ADDRESS SYSTEM. THIS ALERTS PERSONNEL IN UNALARMED | | BUILDINGS WITHIN THE EVACUATION ZONE OF THE FACILITY IN ALARM TO EVACUATE | | TO THEIR ASSEMBLY POINT. DURING TROUBLESHOOTING OF THE PROBLEM WITH THE | | 10mR LIGHT, IT WAS DETERMINED THAT THIS CONDITION EXISTED PRIOR TO THE | | PERFORMANCE OF THE TEST AND WHILE THE CAAS WAS CONSIDERED OPERABLE. | | | | THE RESIDENT INSPECTOR WAS NOTIFIED. | +------------------------------------------------------------------------------+ +----------------------------------+ +-----------------------+ |POWER REACTOR | |EVENT NUMBER: 34035 | +----------------------------------+ +-----------------------+ +------------------------------------------------+-----------------------------+ |FACILITY: DUANE ARNOLD REGION: 3 |NOTIFICATION DATE: 04/08/98 | |UNIT: [1] [ ] [ ] STATE: IA |NOTIFICATION TIME: 05:23 [ET]| |RX TYPE: [1] GE-4 |EVENT DATE: 04/08/98 | +------------------------------------------------+EVENT TIME: 02:06[CDT]| |NRC NOTIFIED BY: STEIMER |LAST UPDATE DATE: 04/08/98 | |HQ OPS OFFICER: CHAUNCEY GOULD +-----------------------------+ +------------------------------------------------+ NOTIFICATIONS | |EMERGENCY CLASS: NOT APPLICABLE +-----------------------------+ |10 CFR SECTION: |MARK RING 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 N 0 REFUELING | 0 REFUELING | | | | | | | | | +-----+---------------------------------------------+--------------------------+ EVENT TEXT +------------------------------------------------------------------------------+ | A PRESSURE DISCHARGE TO THE SUPPRESSION POOL OCCURRED WHILE TWO | | SURVEILLANCES WERE BEING PERFORMED CONCURRENTLY. | | | | WHILE THE PLANT WAS IN DAY 4 OF REFUEL OUTAGE 15 WITH CORE ALTERATIONS IN | | PROGRESS, LOCAL LEAK RATE TESTING (LLRT) WAS IN PROGRESS ON THE "A" INBOARD | | MAIN STEAM ISOLATION VALVE (MSIV) WITH APPROXIMATELY 40 PSIG OF AIR | | PRESSURE BETWEEN THE "A" INBOARD MSIV AND THE "A" MAIN STEAM LINE PLUG AT | | THE REACTOR VESSEL. SURVEILLANCE TESTING OF THE AUTOMATIC DEPRESSURIZATION | | SYSTEM (ADS) TIMER CALIBRATION AND LOGIC SYSTEM FUNCTIONAL(TEST) WAS BEING | | PERFORMED CONCURRENTLY WITH THE LLRT. THE SURVEILLANCE TEST ACTUATES THE | | PILOT SOLENOIDS TO THE 4 ADS SAFETY RELIEF VALVES (SRVs), WHICH PROVIDES | | THE PNEUMATIC PRESSURE TO OPEN THEM. WHEN THIS OCCURRED, THE PRESSURE THAT | | WAS ESTABLISHED IN THE "A" MAIN STEAM LINE DISCHARGED TO THE SUPPRESSION | | POOL. THE DEPRESSURIZATION WAS CONFIRMED BY PERSONNEL PERFORMING THE LLRT | | AND THE SUPPRESSION POOL LEVEL RECORDERS. THE ADS LOGIC TEST WAS SUSPENDED | | UNTIL THE "A" MAIN STEAM LINE WAS COMPLETELY DEPRESSURIZED. | | | | THE RESIDENT INSPECTOR WAS NOTIFIED. | +------------------------------------------------------------------------------+ +----------------------------------+ +-----------------------+ |POWER REACTOR | |EVENT NUMBER: 34036 | +----------------------------------+ +-----------------------+ +------------------------------------------------+-----------------------------+ |FACILITY: COOK REGION: 3 |NOTIFICATION DATE: 04/08/98 | |UNIT: [1] [2] [ ] STATE: MI |NOTIFICATION TIME: 14:40 [ET]| |RX TYPE: [1] W-4-LP,[2] W-4-LP |EVENT DATE: 04/08/98 | +------------------------------------------------+EVENT TIME: 11:00[EDT]| |NRC NOTIFIED BY: RANDY PTACEK |LAST UPDATE DATE: 04/08/98 | |HQ OPS OFFICER: BOB STRANSKY +-----------------------------+ +------------------------------------------------+ NOTIFICATIONS | |EMERGENCY CLASS: NOT APPLICABLE +-----------------------------+ |10 CFR SECTION: |MARK RING RDO | |ADAS 50.72(b)(2)(i) DEG/UNANALYZED COND | | | | | | | | | | | | | | +-----+----------+-------+--------+--------------+--+--------+-----------------+ |UNIT |SCRAM CODE|RX CRIT|INIT PWR| INIT RX MODE |CURR PWR| CURR RX MODE | +-----+----------+-------+--------+-----------------+--------+-----------------+ | 1 | N N 0 COLD SHUTDOWN | 0 COLD SHUTDOWN | | 2 | N N 0 COLD SHUTDOWN | 0 COLD SHUTDOWN | | | | | +-----+---------------------------------------------+--------------------------+ EVENT TEXT +------------------------------------------------------------------------------+ | CONTAINMENT SUMP pH MAY EXCEED TECHNICAL SPECIFICATION BASIS FOLLOWING LOCA | | | | THE LICENSEE HAS DETERMINED THAT THE ASSUMPTIONS USED IN THE WESTINGHOUSE | | "BORDER" ANALYSIS FOR CALCULATING THE MAXIMUM pH IN THE CONTAINMENT SUMP | | FOLLOWING AN ACCIDENT ARE INCOMPLETE. THE LICENSEE'S PRELIMINARY | | CALCULATIONS INDICATE THAT ACTUAL POST-LOCA pH COULD REACH A VALUE BETWEEN | | 9.5 AND 9.7, EXCEEDING THE TECHNICAL SPECIFICATION BASIS OF 9.5. | | | | THE LICENSEE IS CURRENTLY EVALUATING THIS CONDITION TO DETERMINE | | APPROPRIATE CORRECTIVE ACTIONS. IN ADDITION, THE ISSUE IS BEING REVIEWED | | FOR POTENTIAL 10 CFR PART 21 REPORTABILITY. THE NRC RESIDENT INSPECTOR HAS | | BEEN INFORMED. | +------------------------------------------------------------------------------+ +----------------------------------+ +-----------------------+ |FUEL CYCLE FACILITY | |EVENT NUMBER: 34037 | +----------------------------------+ +-----------------------+ +------------------------------------------------+-----------------------------+ |FACILITY: PORTSMOUTH GASEOUS DIFFUSION PLANT |NOTIFICATION DATE: 04/08/98 | | RXTYPE: URANIUM ENRICHMENT FACILITY |NOTIFICATION TIME: 18:14 [ET]| |COMMENTS: 2 DEMOCRACY CENTER |EVENT DATE: 04/08/98 | | 6903 ROCKLEDGE DRIVE |EVENT TIME: 14:15[EDT]| | BETHESDA, MD 20817 (301)564-3200 |LAST UPDATE DATE: 04/08/98 | | CITY: PIKETON REGION: 3 +-----------------------------+ | COUNTY: PIKE STATE: OH |PERSON ORGANIZATION| |LICENSE#: GDP-2 AGREEMENT: N |MARK RING RDO | | DOCKET: 0707002 |MICHAEL WEBER EO | +------------------------------------------------+JOSEPH GIITTER IRD | |NRC NOTIFIED BY: ERIC SPAETH | | |HQ OPS OFFICER: BOB STRANSKY | | +------------------------------------------------+ | |EMERGENCY CLASS: NOT APPLICABLE | | |10 CFR SECTION: | | |NBNL RESPONSE-BULLETIN | | | | | | | | | | | | | | +------------------------------------------------+-----------------------------+ EVENT TEXT +------------------------------------------------------------------------------+ | NRC BULLETIN 91-01 FOUR HOUR REPORT | | | | OPERATIONS PERSONNEL DISCOVERED THAT A CELL IN THE X-330 PROCESS BUILDING | | WAS NOT BEING MAINTAINED AT A POSITIVE PRESSURE AS REQUIRED BY A NUCLEAR | | CRITICALITY SAFETY APPROVAL (NCSA). ON 3/31/1998, A ROUTINE SURVEILLANCE | | SAMPLE TAKEN FROM CELL 29-5-2.1 INDICATED THAT THE CELL WAS IN A UF6 | | NEGATIVE CONDITION, AND SHOULD HAVE BEEN PRESSURIZED TO GREATER THAN 14 | | PSIA WITH DRY AIR OR NITROGEN. AT THE TIME, PERSONNEL FAILED TO RECOGNIZE | | THE CONDITION, AND THE CELL REMAINED AT 6.5 PSIA. THE CELL HAD PREVIOUSLY | | BEEN CLASSIFIED AS PROCESS EXPEDITIOUS HANDLING (PEH), INDICATING THAT MORE | | THAN THE SAFE MASS OF U-235 WAS INVOLVED. | | | | NCSA-0330.004.A02, REQUIREMENT 2 STATES, IN PART, THAT "ANY CASCADE | | EQUIPMENT SHUTDOWN WITH THE MOTORS TURNED OFF AND AT A UF6 NEGATIVE SHALL | | HAVE A PLANT DRY AIR OR NITROGEN BUFFER AT 14 PSIA OR GREATER." THE NCSA | | FURTHER STATES THAT "WHEN A PEH DEPOSIT EXISTS, CONTINGENCIES FOR THE | | OPERATION DO NOT MEET DOUBLE CONTINGENCY CRITERIA." AT 1455 ON 4/8/1998, A | | SPECIAL SAMPLE WAS TAKEN WHICH INDICATED THAT THE CELL WAS AT A UF6 | | NEGATIVE. OPERATIONS PERSONNEL PRESSURIZED THE CELL TO GREATER THAN 14 | | PSIA. | | THE NRC RESIDENT INSPECTOR AND DOE SITE REPRESENTATIVE WILL BE INFORMED. | +------------------------------------------------------------------------------+ +----------------------------------+ +-----------------------+ |POWER REACTOR | |EVENT NUMBER: 34038 | +----------------------------------+ +-----------------------+ +------------------------------------------------+-----------------------------+ |FACILITY: HATCH REGION: 2 |NOTIFICATION DATE: 04/08/98 | |UNIT: [1] [2] [ ] STATE: GA |NOTIFICATION TIME: 20:19 [ET]| |RX TYPE: [1] GE-4,[2] GE-4 |EVENT DATE: 04/08/98 | +------------------------------------------------+EVENT TIME: 16:33[EDT]| |NRC NOTIFIED BY: BARNES |LAST UPDATE DATE: 04/08/98 | |HQ OPS OFFICER: BOB STRANSKY +-----------------------------+ +------------------------------------------------+ NOTIFICATIONS | |EMERGENCY CLASS: NOT APPLICABLE +-----------------------------+ |10 CFR SECTION: |PIERCE SKINNER RDO | |AINC 50.72(b)(2)(iii)(C) POT UNCNTRL RAD REL | | | | | | | | | | | | | | +-----+----------+-------+--------+--------------+--+--------+-----------------+ |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 +------------------------------------------------------------------------------+ | NONCONSERVATIVE RADIATION MONITOR SETPOINTS FOUND DURING CALIBRATION. | | | | WHILE PERFORMING A CALIBRATION OF THE REACTOR BUILDING VENTILATION EXHAUST | | RADIATION MONITORS, TWO OF THE MONITORS WERE FOUND WITH NONCONSERVATIVE | | SETPOINTS. RADIATION MONITOR 1D11-K609A WAS SET TO TRIP AT 55 mR/HR, WHILE | | MONITOR 1D11-K609C WAS SET TO TRIP AT 51 mR/HR. THE TECHNICAL SPECIFICATION | | (TS) SETPOINT LIMIT FOR THESE MONITORS IS 20 mR/HR. | | | | THE LICENSEE STATED THIS CONDITION WOULD HAVE RESULTED IN DELAYED REACTOR | | BUILDING VENTILATION ISOLATION, PCIS GROUP 2 ISOLATION, AND AUTOMATIC | | ACTUATION OF THE STANDBY GAS TREATMENT SYSTEM. THE LICENSEE HAS | | RECALIBRATED THE SETPOINTS TO WITHIN TS LIMITS. THE NRC RESIDENT INSPECTOR | | WILL BE INFORMED. | +------------------------------------------------------------------------------+ +----------------------------------+ +-----------------------+ |POWER REACTOR | |EVENT NUMBER: 34039 | +----------------------------------+ +-----------------------+ +------------------------------------------------+-----------------------------+ |FACILITY: DRESDEN REGION: 3 |NOTIFICATION DATE: 04/09/98 | |UNIT: [ ] [ ] [3] STATE: IL |NOTIFICATION TIME: 02:32 [ET]| |RX TYPE: [1] GE-1,[2] GE-3,[3] GE-3 |EVENT DATE: 04/09/98 | +------------------------------------------------+EVENT TIME: 00:40[CDT]| |NRC NOTIFIED BY: VERCELLI |LAST UPDATE DATE: 04/09/98 | |HQ OPS OFFICER: CHAUNCEY GOULD +-----------------------------+ +------------------------------------------------+ NOTIFICATIONS | |EMERGENCY CLASS: NOT APPLICABLE +-----------------------------+ |10 CFR SECTION: |MARK RING RDO | |ARPS 50.72(b)(2)(ii) RPS ACTUATION | | |AESF 50.72(b)(2)(ii) ESF ACTUATION | | |AIND 50.72(b)(2)(iii)(D) ACCIDENT MITIGATION | | | | | | | | +-----+----------+-------+--------+--------------+--+--------+-----------------+ |UNIT |SCRAM CODE|RX CRIT|INIT PWR| INIT RX MODE |CURR PWR| CURR RX MODE | +-----+----------+-------+--------+-----------------+--------+-----------------+ | | | | | | | | | 3 | A/R Y 100 POWER OPERATION | 0 HOT SHUTDOWN | +-----+---------------------------------------------+--------------------------+ EVENT TEXT +------------------------------------------------------------------------------+ | PLANT HAD A REACTOR SCRAM FROM 100% POWER DUE TO MAIN STEAM ISOLATION VALVE | | (MSIV) CLOSURE. | | | | THE PLANT RECEIVED A REACTOR SCRAM DUE TO MSIV CLOSURE. THIS OCCURRED | | WHILE THE UNIT WAS OPERATING WITH A 1/2 GROUP 1(MSIV) ISOLATION DUE TO A | | FAILED MAIN STEAM LINE HIGH FLOW SWITCH, BUT NO WORK WAS IN PROGRESS AT | | THIS TIME. NO GROUP 1 ISOLATION SIGNAL WAS RECEIVED BASED ON A REVIEW OF | | THE ANNUNCIATORS, BUT THEY ARE STILL INVESTIGATING TO DETERMINE THE CAUSE | | OF THE MSIV CLOSURE. ALL RODS FULLY INSERTED, NO SAFETY VALVES LIFTED AND | | NO INJECTION OCCURRED. AS A RESULT OF A HIGH REACTOR WATER LEVEL, WATER | | ENTERED THE HIGH PRESSURE COOLANT INJECTION SYSTEM AND IT WAS THEN DECLARED | | INOPERABLE. A GROUP 2 AND 3 ISOLATION WAS LATER RECEIVED ON LOW WATER | | LEVEL. HPCI WAS DECLARED OPERABLE AT 0119 WHEN WATER WAS DRAINED FROM THE | | HPCI LINE. REACTOR PRESSURE IS BEING CONTROLLED WITH THE ISOLATION | | CONDENSER. | | | | THE RESIDENT INSPECTOR WILL BE INFORMED. | | | +------------------------------------------------------------------------------+