U.S. Nuclear Regulatory Commission Operations Center Event Reports For 07/16/96 - 07/17/96 ** EVENT NUMBERS ** 30754 30755 30756 +----------------------------------+ +-----------------------+ |POWER REACTOR | |EVENT NUMBER: 30754 | +----------------------------------+ +-----------------------+ +------------------------------------------------+-----------------------------+ |FACILITY: DUANE ARNOLD REGION: 3 |NOTIFICATION DATE: 07/16/96 | |UNIT: [1] [ ] [ ] STATE: IA |NOTIFICATION TIME: 07:26 [ET]| |RX TYPE: [1] GE-4 |EVENT DATE: 07/16/96 | +------------------------------------------------+EVENT TIME: 04:53[CDT]| |NRC NOTIFIED BY: KEVIN STEIMER |LAST UPDATE DATE: 07/16/96 | |HQ OPS OFFICER: DOUG WEAVER +-----------------------------+ +------------------------------------------------+ NOTIFICATIONS | |EMERGENCY CLASS: NOT APPLICABLE +-----------------------------+ |10 CFR SECTION: |JOHN MADERA 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 Y 99 POWER OPERATION | 99 POWER OPERATION | | | | | | | | | +-----+---------------------------------------------+--------------------------+ EVENT TEXT +------------------------------------------------------------------------------+ | ESF ACTUATION - LOSS OF THE "A" RPS BUS | | | | THE "A" REACTOR PROTECTION BUS LOST POWER WHEN EPA BREAKER A-1 (RPS MG | | OUTPUT BREAKER) TRIPPED ON UNDERVOLTAGE. A HALF SCRAM AND PRIMARY | | CONTAINMENT ISOLATION SIGNAL GROUPS 1-5 ISOLATIONS WERE RECEIVED (EXCEPT | | MSIVs). ALL ISOLATIONS OCCURRED AS EXPECTED AND WENT TO COMPLETION. | | | | THE CAUSE OF THE UV TRIP IS UNKNOWN AND UNDER INVESTIGATION. THE "A" RPS | | BUS IS STILL DEENERGIZED PENDING FURTHER INVESTIGATION OF THE FAULT. THE | | LICENSEE INFORMED THE NRC RESIDENT INSPECTOR. | +------------------------------------------------------------------------------+ +----------------------------------+ +-----------------------+ |POWER REACTOR | |EVENT NUMBER: 30755 | +----------------------------------+ +-----------------------+ +------------------------------------------------+-----------------------------+ |FACILITY: PALISADES REGION: 3 |NOTIFICATION DATE: 07/16/96 | |UNIT: [1] [ ] [ ] STATE: MI |NOTIFICATION TIME: 19:45 [ET]| |RX TYPE: [1] CE |EVENT DATE: 07/16/96 | +------------------------------------------------+EVENT TIME: 18:53[EDT]| |NRC NOTIFIED BY: ROBERTS |LAST UPDATE DATE: 07/16/96 | |HQ OPS OFFICER: BOB STRANSKY +-----------------------------+ +------------------------------------------------+ NOTIFICATIONS | |EMERGENCY CLASS: NOT APPLICABLE +-----------------------------+ |10 CFR SECTION: |MADERA RDO | |ASHU 50.72(b)(1)(i)(A) PLANT S/D REQD BY TS | | | | | | | | | | | | | | +-----+----------+-------+--------+--------------+--+--------+-----------------+ |UNIT |SCRAM CODE|RX CRIT|INIT PWR| INIT RX MODE |CURR PWR| CURR RX MODE | +-----+----------+-------+--------+-----------------+--------+-----------------+ | 1 | N Y 100 POWER OPERATION | 99 POWER OPERATION | | | | | | | | | +-----+---------------------------------------------+--------------------------+ EVENT TEXT +------------------------------------------------------------------------------+ | TECHNICAL SPECIFICATION REQUIRED SHUTDOWN DUE TO TOTAL CONTAINMENT LEAKAGE | | GREATER THAN La. | | | | THE LICENSEE COMMENCED A UNIT SHUTDOWN IN ACCORDANCE WITH TECHNICAL | | SPECIFICATION 4.5.2.C.2 DUE TO TOTAL CONTAINMENT LEAKAGE OF GREATER THAN | | La. WHILE PERFORMING THE SEMIANNUAL CONTAINMENT PERSONNEL AIRLOCK PRESSURE | | TEST, THE LICENSEE DETERMINED THAT THE INNER CONTAINMENT PERSONNEL AIRLOCK | | DOOR WAS LEAKING. THE LICENSEE THEN TESTED THE OUTER DOOR, WHICH ALSO | | LEAKED. AT 1853, THE LICENSEE BEGAN A SHUTDOWN OF THE UNIT IN ACCORDANCE | | WITH TECHNICAL SPECIFICATIONS. COINCIDENTALLY, THE LICENSEE PERFORMED | | MAINTENANCE ON THE OUTER AIRLOCK DOOR, AND SUCCESSFULLY RETESTED THE OUTER | | DOOR AT 1926. THE LICENSEE HAS DECLARED THE OUTER DOOR OPERABLE AND STOPPED | | THE UNIT SHUTDOWN. | | | | THE UNIT REMAINS IN A 48 HOUR LIMITING CONDITION FOR OPERATION (WHICH BEGAN | | AT 1445 7/16/96) IN ACCORDANCE WITH SPECIFICATION 4.5.2.3 DUE TO EXCESSIVE | | LEAKAGE PAST THE INNER CONTAINMENT PERSONNEL AIRLOCK DOOR. THE LICENSEE HAS | | DETERMINED THAT STRONGBACKS INSTALLED ON THE INNER DOOR TO PERMIT INTERNAL | | PRESSURIZATION OF THE AIRLOCK WERE NOT TORQUED PROPERLY, CAUSING THE INNER | | DOOR TO BE INSUFFICIENTLY SUPPORTED AGAINST THE INTERNAL PRESSURE (55 PSIG) | | APPLIED TO THE AIRLOCK. THE LICENSEE EXPECTS TO COMPLETE TESTING OF THE | | PERSONNEL AIRLOCK WITHIN THE NEXT 24 HOURS. THE NRC RESIDENT INSPECTOR HAS | | BEEN INFORMED BY THE LICENSEE. | | | +------------------------------------------------------------------------------+ +----------------------------------+ +-----------------------+ |POWER REACTOR | |EVENT NUMBER: 30756 | +----------------------------------+ +-----------------------+ +------------------------------------------------+-----------------------------+ |FACILITY: MILLSTONE REGION: 1 |NOTIFICATION DATE: 07/16/96 | |UNIT: [1] [ ] [ ] STATE: CT |NOTIFICATION TIME: 20:35 [ET]| |RX TYPE: [1] GE-3,[2] CE,[3] W-4-LP |EVENT DATE: 07/16/96 | +------------------------------------------------+EVENT TIME: 20:35[EDT]| |NRC NOTIFIED BY: W. SPAHN |LAST UPDATE DATE: 07/16/96 | |HQ OPS OFFICER: BOB STRANSKY +-----------------------------+ +------------------------------------------------+ NOTIFICATIONS | |EMERGENCY CLASS: NOT APPLICABLE +-----------------------------+ |10 CFR SECTION: |DOLCE 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 N 0 REFUELING | 0 REFUELING | | | | | | | | | +-----+---------------------------------------------+--------------------------+ EVENT TEXT +------------------------------------------------------------------------------+ | THE LICENSEE PLANS TO MAKE A PRESS RELEASE REGARDING THE CONTAMINATION OF | | WORKERS NEAR THE SPENT FUEL POOL. SEVERAL PLANT EMPLOYEES RECEIVED MINOR | | SKIN CONTAMINATION DURING AN EVENT THAT OCCURRED WHILE LIFTING A FILTER | | FROM THE SPENT FUEL POOL EARLIER TODAY. THE NRC RESIDENT INSPECTOR HAS BEEN | | INFORMED BY THE LICENSEE. | | | | HOO NOTE: A CONFERENCE CALL BETWEEN THE LICENSEE, NRC REGION I AND | | HEADQUARTERS WAS HELD AT 1830 REGARDING THIS EVENT. PARTICIPANTS: J. DURR | | (R1), J. WHITE (R1), M. VIRGILIO (NRR), T. EASLICK (SRI), W. LANNING (R1), | | AND SEVERAL LICENSEE REPRESENTATIVES. | +------------------------------------------------------------------------------+