U.S. Nuclear Regulatory Commission Operations Center Event Reports For 10/11/94 - 10/12/94 ** EVENT NUMBERS ** 27885 27886 27887 +----------------------------------+ +-----------------------+ |POWER REACTOR | |EVENT NUMBER: 27885 | +----------------------------------+ +-----------------------+ +------------------------------------------------+-----------------------------+ |FACILITY: CLINTON REGION: 3 |NOTIFICATION DATE: 10/11/94 | |UNIT: [1] [ ] [ ] STATE: IL |NOTIFICATION TIME: 04:10 [ET]| |RX TYPE: [1] GE-6 |EVENT DATE: 10/11/94 | +------------------------------------------------+EVENT TIME: 02:20[CDT]| |NRC NOTIFIED BY: PHILLIP SHORT |LAST UPDATE DATE: 10/11/94 | |HQ OPS OFFICER: JOHN MacKINNON +-----------------------------+ +------------------------------------------------+ NOTIFICATIONS | |EMERGENCY CLASS: NOT APPLICABLE +-----------------------------+ |10 CFR SECTION: |JEFF WRIGHT RDO | |ASHU 50.72(b)(1)(i)(A) PLANT S/D REQD BY TS | | |NLCO TECH SPEC LCO A/S | | | | | | | | | | | +-----+----------+-------+--------+--------------+--+--------+-----------------+ |UNIT |SCRAM CODE|RX CRIT|INIT PWR| INIT RX MODE |CURR PWR| CURR RX MODE | +-----+----------+-------+--------+-----------------+--------+-----------------+ | 1 | N Y 89 POWER OPERATION | 89 POWER OPERATION | | | | | | | | | +-----+---------------------------------------------+--------------------------+ EVENT TEXT +------------------------------------------------------------------------------+ | LICENSEE WAS IN A REQUIRED TECH SPEC SHUTDOWN WHEN THEY ENTERED TECH SPEC | | 3.0.3. FOR CONTROL ROOM POSITIVE PRESSURE BEING OUT OF SPECIFICATION. | | LICENSEE EXITED TECH SPEC 3.0.3 AND TECH SPEC REQUIRE SHUTDOWN AT 0253CT. | | | | AT 0220CT IT WAS NOTED BY MAIN CONTROL ROOM PERSONNEL THAT THE CONTROL ROOM | | VENTILATION SYSTEM TRAIN "B" IN OPERATION WAS NOT MAINTAINING A POSITIVE | | PRESSURE OF 0.125" OF WATER AS REQUIRED PER TECH SPEC. A MAINTENANCE OUTAGE | | IS CURRENTLY IN PROGRESS FOR CONTROL ROOM VENTILATION TRAIN "A". THEREFORE, | | BOTH CONTROL ROOM VENTILATION TRAINS WERE DECLARED INOPERABLE AND TECH SPEC | | 3.0.3 WAS ENTERED. IT IS BELIEVED THAT THEY HAVE A TAGOUT PROBLEM WITH | | CONTROL ROOM VENTILATION TRAIN "A" AND THIS WAS CAUSING THE INABILITY OF | | TRAIN "B" NOT TO MAINTAIN A POSITIVE PRESSURE OF 0.125" OF WATER. | | ALL WORK ON TRAIN "A" WAS STOPPED AND LICENSEE IS TRYING TO FIND/CORRECT | | THE PROBLEM. | | AT 0253CT CONTROL ROOM VENTILATION TRAIN "B" WAS SHIFTED TO THE HIGH | | RADIATION MODE OF OPERATION (TECH SPEC 3.0.3 WAS EXITED AT THIS TIME) AND | | POSITIVE PRESSURE IS NOW 0.125" OF WATER. LICENSEE WILL LEAVE CONTROL ROOM | | VENTILATION TRAIN "B" IN THE HIGH RADIATION MODE OF OPERATION UNTIL PROBLEM | | IS CORRECTED. | | | | RESIDENT INSPECTOR WILL BE INFORMED BY THE LICENSEE. | +------------------------------------------------------------------------------+ +----------------------------------+ +-----------------------+ |POWER REACTOR | |EVENT NUMBER: 27886 | +----------------------------------+ +-----------------------+ +------------------------------------------------+-----------------------------+ |FACILITY: PEACH BOTTOM REGION: 1 |NOTIFICATION DATE: 10/11/94 | |UNIT: [ ] [3] [ ] STATE: PA |NOTIFICATION TIME: 12:45 [ET]| |RX TYPE: [2] GE-4,[3] GE-4 |EVENT DATE: 10/11/94 | +------------------------------------------------+EVENT TIME: 11:21[EDT]| |NRC NOTIFIED BY: MANNNIX |LAST UPDATE DATE: 10/11/94 | |HQ OPS OFFICER: GREG SCARFO +-----------------------------+ +------------------------------------------------+ NOTIFICATIONS | |EMERGENCY CLASS: NOT APPLICABLE +-----------------------------+ |10 CFR SECTION: |MODES 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 | +-----+----------+-------+--------+-----------------+--------+-----------------+ | | | | | 3 | A/R Y 100 POWER OPERATION | 0 HOT SHUTDOWN | | | | | +-----+---------------------------------------------+--------------------------+ EVENT TEXT +------------------------------------------------------------------------------+ | A TURBINE TRIP/REACTOR SCRAM OCCURRED IN RESPONSE TO A TRANSIENT WHICH | | OCCURRED IN A 120VAC INVERTER FOR UNKNOWN REASONS. | | | | AN ELECTRICAL TRANSIENT IN A 120VAC UNINTERRUPTIBLE POWER SUPPLY (STATIC | | INVERTER), WHICH OCCURRED FOR UNKNOWN REASONS, RESULTED IN A RECIRCULATION | | PUMP RUNBACK TO 50% REACTOR POWER. THE FEEDWATER SYSTEM FAILED TO RESPOND | | QUICKLY AND REACTOR WATER LEVEL INCREASED FROM +23 INCHES TO +45 INCHES | | (HI-HI LEVEL SETPOINT) WHERE AN AUTOMATIC TURBINE TRIP AND REACTOR FEED | | PUMP TRIP OCCURRED. A REACTOR SCRAM OCCURRED ON THE FAST-CLOSURE OF THE | | TURBINE CONTROL VALVES. REACTOR PRESSURE INCREASED TO 992 PSIG FROM THE | | NORMAL OPERATING PRESSURE OF 980 PSIG. NO SAFETY/RELIEF VALVES LIFTED | | AFTER THE SCRAM. REACTOR WATER LEVEL DECREASED TO -10 INCHES, BELOW THE | | LO-LO SETPOINT OF 0 INCHES WHERE ANOTHER REACTOR SCRAM SIGNAL WAS ISSUED, A | | GROUP 2 (RWCU, DRYWELL SUMP ISOLATION VALVES, AND OTHER PRIMARY CONTAINMENT | | ISOLATION VALVES) ISOLATION OCCURRED, AND A GROUP 3 (REACTOR BUILDING | | VENTILATION SYSTEM) ISOLATION OCCURRED. NO OTHER ESF ACTUATIONS AND ECCS | | ACTUATIONS OCCURRED. THE FAST-BUS TRANSFER OF PLANT LOADS OCCURRED WITHOUT | | INCIDENT. | | | | CURRENTLY, THE UNIT IS STABLE IN HOT SHUTDOWN. REACTOR FEED PUMP "C" IS | | SUPPLYING THE VESSEL AND DECAY HEAT IS BEING DISSIPATED TO THE CONDENSER | | VIA A BYPASS VALVE. THE PLANT IS IN NATURAL CIRCULATION WITH OPERATORS | | PREPARING TO START ONE RECIRCULATION PUMP. OFFSITE POWER IS STABLE AND | | THE EMERGENCY DIESEL GENERATORS ARE AVAILABLE. ALL ECCS ARE OPERABLE AND | | AVAILABLE. | | | | THE CAUSE OF THE ELECTRICAL TRANSIENT IS UNDER INVESTIGATION. THE LICENSEE | | INFORMED THE NRC RESIDENT INSPECTOR. | +------------------------------------------------------------------------------+ +----------------------------------+ +-----------------------+ |POWER REACTOR | |EVENT NUMBER: 27887 | +----------------------------------+ +-----------------------+ +------------------------------------------------+-----------------------------+ |FACILITY: CLINTON REGION: 3 |NOTIFICATION DATE: 10/11/94 | |UNIT: [1] [ ] [ ] STATE: IL |NOTIFICATION TIME: 23:42 [ET]| |RX TYPE: [1] GE-6 |EVENT DATE: 10/11/94 | +------------------------------------------------+EVENT TIME: 22:28[CDT]| |NRC NOTIFIED BY: MOTSEGOOD |LAST UPDATE DATE: 10/12/94 | |HQ OPS OFFICER: GREG SCARFO +-----------------------------+ +------------------------------------------------+ NOTIFICATIONS | |EMERGENCY CLASS: NOT APPLICABLE +-----------------------------+ |10 CFR SECTION: |RONALD GARDNER RDO | |ASHU 50.72(b)(1)(i)(A) PLANT S/D REQD BY TS | | |NLCO TECH SPEC LCO A/S | | | | | | | | | | | +-----+----------+-------+--------+--------------+--+--------+-----------------+ |UNIT |SCRAM CODE|RX CRIT|INIT PWR| INIT RX MODE |CURR PWR| CURR RX MODE | +-----+----------+-------+--------+-----------------+--------+-----------------+ | 1 | N Y 88 POWER OPERATION | 88 POWER OPERATION | | | | | | | | | +-----+---------------------------------------------+--------------------------+ EVENT TEXT +------------------------------------------------------------------------------+ | A TECHNICAL SPECIFICATION (T/S)-REQUIRED SHUTDOWN WAS INITIATED WHEN THE | | DRYWELL (DW) ATMOSPHERIC PARTICULATE RADIATION MONITORING (RM) SYSTEM AND | | THE DRYWELL SUMP FLOOR MONITORING SYSTEM WERE FOUND TO BE INOPERABLE. | | | | A T/S-REQUIRED SHUTDOWN WAS INITIATED PER T/S ACTION STATEMENT 3.4.3.1 WHEN | | THE DW ATMOSPHERIC PARTICULATE RM SYSTEM AND THE DW SUMP FLOOR MONITORING | | SYSTEM WERE FOUND TO BE INOPERABLE. THE DW ATMOSPHERIC PARTICULATE RM | | SYSTEM WAS TAKEN OUT OF SERVICE TO CHANGE THE PAPER-CATCH ASSOCIATED WITH | | THE SYSTEM. THE LICENSEE ANTICIPATES THAT THIS PROCESS WILL TAKE | | APPROXIMATELY 2 HOURS. INSPECTION OF THE "TAKE-UP REEL" DETERMINED THAT THE | | DW SUMP FLOOR MONITORING SYSTEM WAS NOT FUNCTIONAL FOR UNKNOWN REASONS. AN | | ALTERNATIVE MEANS OF MEASURING THE SUMP INVENTORY HAS BEEN ESTABLISHED (A | | TIMELY AUTOMATIC/MANUAL SUMP PUMP ACTUATION WHILE MEASURING THE PUMP-OUT | | TIMES TO ESTABLISH AN AVERAGE INVENTORY). | | | | THE LICENSEE ANTICIPATES THAT THE T/S REQUIRED SHUTDOWN WILL BE TERMINATED | | PRIOR TO THE REDUCTION OF POWER. THE LICENSEE INFORMED THE NRC RESIDENT | | INSPECTOR. | | | | * * * UPDATE AT 0139 CDT ON 10/12/94 BY SHORT TAKEN BY WEAVER * * * | | THE 12 HOUR SHUTDOWN ACTION STATEMENT WAS EXITED AT 0025 CDT ON 10/12/94. | | THE PAPER PROBLEM WAS CORRECTED AND WAS VERIFIED TO BE OPERATING PROPERLY | | IN THE FISSION PRODUCT MONITOR (DRYWELL ATMOSPHERIC PARTICULATE MONITORING | | SYSTEM). NO POWER REDUCTION WAS INITIATED. THE LICENSEE WILL INFORM THE | | NRC RESIDENT INSPECTOR. THE HOO NOTIFIED THE R3DO (GARDNER). | +------------------------------------------------------------------------------+