U.S. Nuclear Regulatory Commission Operations Center Event Reports For 01/10/95 - 01/11/95 ** EVENT NUMBERS ** 28154 28227 28228 !!!!!!!!! THIS EVENT HAS BEEN RETRACTED. THIS EVENT HAS BEEN RETRACTED !!!!!!! +----------------------------------+ +-----------------------+ |POWER REACTOR | |EVENT NUMBER: 28154 | +----------------------------------+ +-----------------------+ +------------------------------------------------+-----------------------------+ |FACILITY: FERMI REGION: 3 |NOTIFICATION DATE: 12/17/94 | |UNIT: [2] [ ] [ ] STATE: MI |NOTIFICATION TIME: 13:20 [ET]| |RX TYPE: [2] GE-4 |EVENT DATE: 12/17/94 | +------------------------------------------------+EVENT TIME: 09:33[EST]| |NRC NOTIFIED BY: RAY |LAST UPDATE DATE: 01/10/95 | |HQ OPS OFFICER: TIM McGINTY +-----------------------------+ +------------------------------------------------+ NOTIFICATIONS | |EMERGENCY CLASS: NOT APPLICABLE +-----------------------------+ |10 CFR SECTION: |JIM MCCORMICKBARGER RDO | |AESF 50.72(b)(2)(ii) ESF ACTUATION | | | | | | | | | | | | | | +-----+----------+-------+--------+--------------+--+--------+-----------------+ |UNIT |SCRAM CODE|RX CRIT|INIT PWR| INIT RX MODE |CURR PWR| CURR RX MODE | +-----+----------+-------+--------+-----------------+--------+-----------------+ | 2 | N N 0 STARTUP | 0 STARTUP | | | | | | | | | +-----+---------------------------------------------+--------------------------+ EVENT TEXT +------------------------------------------------------------------------------+ | CONTROL CENTER VENTILATION SWAPPED TO THE RECIRC MODE DUE TO AN INVALID | | SIGNAL. | | | | FERMI HAD AN AUTOMATIC SWAP OF CONTROL CENTER (CC) HVAC FROM THE NORMAL | | MODE TO THE RECIRC MODE DUE TO AN UPSCALE TRIP SIGNAL FROM THE CONTROL | | CENTER MAKEUP AIR VENTILATION RADIATION MONITOR. THE CONTROL CENTER MAKEUP | | AIR VENTILATION UPSCALE ALARM ALSO CAME IN AT THIS TIME AS DID THE RHR | | SERVICE WATER RAD MONITOR UPSCALE ALARM AND THE RHR SERVICE WATER UPSCALE | | TRIP ALARM. THESE RAD MONITORS SHARE A COMMON POWER SUPPLY. | | | | INITIAL INVESTIGATION SHOWS THAT THESE SIGNALS ARE INVALID, AND UPON | | CONFIRMATION OF THE INITIAL INVESTIGATION, THIS NOTIFICATION WILL BE | | RETRACTED. THE LICENSEE HAS RESET THE RAD MONITORS AND WILL BE | | RE-ESTABLISHING A NORMAL CONTROL CENTER VENTILATION LINEUP UPON VERIFYING | | THE SIGNALS ARE INVALID. THE LICENSEE WILL BE INVESTIGATING THE COMMON | | POWER SUPPLY FOR PROBLEMS. FERMI 2 IS IN STARTUP, BUT HAS NOT BEGUN TO | | PULL RODS YET PENDING THE COMPLETION OF A FEW OUTSTANDING ITEMS. THE | | LICENSEE INFORMED THE RESIDENT INSPECTOR. | | | | *** RETRACTION FROM HOSKIN TO HUFFMAN AT 1319 EST ON 01/10/95 *** | | | | INVESTIGATION INTO THIS ACTUATION CONFIRMED THAT NO RADIOACTIVE SOURCE | | CAUSED THE DETECTOR RESPONSE. PORTABLE AIR SAMPLES IN THE VICINITY OF THE | | CONTROL CENTER HVAC RADIATION MONITOR SHOWED NO ABNORMAL LEVELS. A | | RADIATION SURVEY IN THE AREA OF THE RHR SERVICE WATER RADIATION MONITOR HAD | | NORMAL READINGS AS WELL. | | | | BASED ON THESE SAMPLE RESULTS AND THE PHYSICAL INDEPENDENCE OF THE | | MONITORED PROCESS STREAMS, THE INVESTIGATION CONCLUDED THAT A TRANSIENT | | FROM THE COMMON POWER SUPPLY WAS THE MOST PROBABLE CAUSE FOR THE RADIATION | | MONITOR ALARMS. SINCE NO EVIDENCE OF A TRUE HIGH RADIATION TRIP WAS FOUND, | | THE TRIP IS CONSIDERED INVALID. THEREFORE, THIS EVENT NOTIFICATION IS BEING | | RETRACTED. | | | | THE NRC RESIDENT INSPECTOR WILL BE NOTIFIED. R3DO(SHEAR) HAS BEEN INFORMED. | +------------------------------------------------------------------------------+ +----------------------------------+ +-----------------------+ |POWER REACTOR | |EVENT NUMBER: 28227 | +----------------------------------+ +-----------------------+ +------------------------------------------------+-----------------------------+ |FACILITY: HADDAM NECK REGION: 1 |NOTIFICATION DATE: 01/10/95 | |UNIT: [1] [ ] [ ] STATE: CT |NOTIFICATION TIME: 14:57 [ET]| |RX TYPE: [1] W-4-LP |EVENT DATE: 01/10/95 | +------------------------------------------------+EVENT TIME: 14:27[EST]| |NRC NOTIFIED BY: STEVE CARNESI |LAST UPDATE DATE: 01/10/95 | |HQ OPS OFFICER: WILLIAM HUFFMAN +-----------------------------+ +------------------------------------------------+ 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 OF HYDRAZINE LEAK IN PRIMARY AUXILIARY BUILDING. | | | | A PLANT CHEMISTRY TECHNICIAN NOTICED AN UNUSUAL ODOR IN THE PRIMARY | | AUXILIARY BUILDING (PAB). INVESTIGATION DETERMINED THAT THE ODOR WAS DUE TO | | HYDRAZINE. THE EXACT SOURCE OF THE HYDRAZINE HAS NOT BEEN IDENTIFIED. | | HOWEVER, IT APPEARS TO BE COMING FROM THE STEAM GENERATOR BLOWDOWN VENT | | CONDENSERS. A THERMOSTATIC TRAP (USED FOR VENTING OFF NON-CONDENSABLE | | GASES) ON ONE OF THE BLOWDOWN CONDENSERS WAS FOUND STUCK OPEN. IN ADDITION, | | THE PLENUM TO WHICH THE TRAP VENTS WAS LEAKING, ALLOWED GASES TO ESCAPE | | INTO THE PAB. THE BLOWDOWN VENT CONDENSER HAS BEEN ISOLATED. HYDRAZINE IS | | USED TO MAINTAIN SECONDARY SIDE CHEMISTRY AND COULD BE ENTRAINED IN THE | | NON-CONDENSABLE GASES FROM THE BLOWDOWN CONDENSER. | | | | OSHA LIMITS FOR HYDRAZINE ARE 1 PPM. THE DETECTION INSTRUMENT BEING USED BY | | THE PLANT HAD AN UPPER LIMIT OF 2 PPM AND IT WAS PEGGED HIGH SO THE MAXIMUM | | CONCENTRATION REACHED IS NOT KNOWN. MOST OF THE HYDRAZINE WAS CONFINED TO | | THE BLOWDOWN ROOM AND THE AREA NEAR THE PLENUM LEAK. ALL LEVELS ARE NOW | | BELOW OSHA LIMITS AND CONTINUING TO DROP. | | | | THE CHEMISTRY TECHNICIAN WHO DISCOVERED THE PROBLEM WAS GIVEN A | | PRECAUTIONARY EXAM AT A LOCAL HOSPITAL AND WAS FOUND TO BE UNAFFECTED. THE | | LICENSEE STATES THAT THE HYDRAZINE LEAK DID NOT IMPEDE OR HAMPER THEIR | | ABILITY TO SAFELY OPERATE THE PLANT. | | | | OFFSITE NOTIFICATION WAS MADE TO THE STATE DEPARTMENT OF ENVIRONMENT. THE | | NRC RESIDENT INSPECTOR HAS ALSO BEEN INFORMED. | +------------------------------------------------------------------------------+ +----------------------------------+ +-----------------------+ |POWER REACTOR | |EVENT NUMBER: 28228 | +----------------------------------+ +-----------------------+ +------------------------------------------------+-----------------------------+ |FACILITY: DRESDEN REGION: 3 |NOTIFICATION DATE: 01/10/95 | |UNIT: [ ] [ ] [3] STATE: IL |NOTIFICATION TIME: 17:17 [ET]| |RX TYPE: [1] GE-1,[2] GE-3,[3] GE-3 |EVENT DATE: 01/10/95 | +------------------------------------------------+EVENT TIME: 14:24[CST]| |NRC NOTIFIED BY: STEVE KUCZYNSKI |LAST UPDATE DATE: 01/10/95 | |HQ OPS OFFICER: WILLIAM HUFFMAN +-----------------------------+ +------------------------------------------------+ NOTIFICATIONS | |EMERGENCY CLASS: NOT APPLICABLE +-----------------------------+ |10 CFR SECTION: |GARY SHEAR RDO | |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 N 0 COLD SHUTDOWN | 0 COLD SHUTDOWN | +-----+---------------------------------------------+--------------------------+ EVENT TEXT +------------------------------------------------------------------------------+ | SPURIOUS ESF ACTUATION SIGNAL DURING SHUTDOWN MAINTENANCE WORK. | | | | DURING MAINTENANCE WORK ON A REACTOR PRESSURE SWITCH, A FULL SCRAM AND | | GROUP II AND III (CONTAINMENT ISOLATIONS, SHUTDOWN COOLING, & RWCU) | | ISOLATION SIGNALS WERE RECEIVED. ALL SYSTEMS RESPONDED AS EXPECTED. REACTOR | | BUILDING VENTILATION TRIPPED AND STANDBY GAS TREATMENT AUTO-STARTED. | | | | ALL SYSTEMS HAVE BEEN RESET. SHUTDOWN COOLING WAS LOST FOR APPROXIMATELY 10 | | MINUTES WITH NO TEMPERATURE INCREASE. | | | | A SHORT DURATION LEVEL SPIKE IS BELIEVED TO BE THE CAUSE OF THE SCRAM AND | | ISOLATION SIGNALS. EXACT CAUSE OF THE LEVEL SPIKE IS NOT DEFINITIVELY KNOWN | | AT THIS TIME. INVESTIGATION IS STILL IN PROGRESS. | | | | THE NRC RESIDENT INSPECTOR WILL BE INFORMED. | +------------------------------------------------------------------------------+