U.S. Nuclear Regulatory Commission Operations Center Event Reports For 07/20/94 - 07/21/94 ** EVENT NUMBERS ** 27554 27555 27556 +----------------------------------+ +-----------------------+ |POWER REACTOR | |EVENT NUMBER: 27554 | +----------------------------------+ +-----------------------+ +------------------------------------------------+-----------------------------+ |FACILITY: SOUTH TEXAS REGION: 4 |NOTIFICATION DATE: 07/20/94 | |UNIT: [1] [ ] [ ] STATE: TX |NOTIFICATION TIME: 12:28 [ET]| |RX TYPE: [1] W-4-LP,[2] W-4-LP |EVENT DATE: 07/19/94 | +------------------------------------------------+EVENT TIME: 16:30[CDT]| |NRC NOTIFIED BY: JAIRO PINZON |LAST UPDATE DATE: 07/20/94 | |HQ OPS OFFICER: JOSEPH SEBROSKY +-----------------------------+ +------------------------------------------------+ NOTIFICATIONS | |EMERGENCY CLASS: NOT APPLICABLE +-----------------------------+ |10 CFR SECTION: |WILLIAM JOHNSON RDO | |NLTR LICENSEE 24 HR REPORT | | | | | | | | | | | | | | +-----+----------+-------+--------+--------------+--+--------+-----------------+ |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 +------------------------------------------------------------------------------+ | LICENSEE DETERMINED THAT THEY FAILED TO FULLY MEET A REQUIREMENT FOR A | | SURVEILLANCE FOR THE ESSENTIAL COOLING WATER SYSTEM. | | | | THE FOLLOWING IS A TEXT OF A FACSIMILE FROM THE LICENSEE: | | | | "AT APPROXIMATELY 1630 HOURS, ON JULY 19, 1994, SOUTH TEXAS PROJECT | | MANAGEMENT CONCLUDED THAT UNIT 1 HAD FAILED TO FULLY MEET THE SURVEILLANCE | | REQUIREMENTS OF TECHNICAL SPECIFICATION 4.7.4, ESSENTIAL COOLING WATER | | SYSTEM. TECHNICAL SPECIFICATION 4.7.4.A REQUIRES THAT AT LEAST THREE | | ESSENTIAL COOLING WATER LOOPS SHALL BE DEMONSTRATED OPERABLE AT LEAST ONCE | | PER 31 DAYS BY VERIFYING THAT EACH VALVE (MANUAL, POWER OPERATED, OR | | AUTOMATIC) SERVICING SAFETY-RELATED EQUIPMENT THAT IS NOT LOCKED, SEALED, | | OR OTHERWISE SECURED IN POSITION IS IN ITS CORRECT POSITION. CONTRARY TO | | THIS, IT WAS DETERMINED THAT THIS SURVEILLANCE REQUIREMENT WAS NOT BEING | | PERFORMED ON ONE ESSENTIAL COOLING WATER SYSTEM VALVE FOR EACH TRAIN, THAT | | WAS LOCKED CLOSED PER AN EQUIPMENT CLEARANCE ORDER. PER DISCUSSIONS WITH | | THE NRC SENIOR RESIDENT INSPECTOR, IT WAS CONCLUDED THAT USE OF THE | | EQUIPMENT CLEARANCE ORDER IS NOT APPROPRIATE TO CONSIDER THE VALVE CLOSED | | AND AS SUCH WOULD REQUIRE THE 31 DAY VERIFICATION. | | | | THE APPLICABILITY TO UNIT 2 IS ALSO BEING REVIEWED. | | | | THE FAILURE TO PERFORM A TECHNICAL SPECIFICATION SURVEILLANCE IS REPORTABLE | | AS A VIOLATION OF THE PLANT OPERATING LICENSE NO. NPF-76 (2G) SECTION | | 2.C(2) (24 HOUR REPORT)." END OF TEXT. | | | | THE THREE VALVES IN QUESTION HAVE BEEN VERIFIED TO BE IN THEIR CORRECT | | POSITION. THE LICENSEE CONSIDERS THE ESSENTIAL COOLING WATER SYSTEM | | OPERABLE. THE SURVEILLANCE WAS PERFORMED INCORRECTLY SINCE APPROXIMATELY | | MARCH OF THIS YEAR WHICH IS THE TIME THAT THE VALVES WERE TAGGED. | | | | THE LICENSEE HAS INFORMED THE RESIDENT INSPECTOR. | | | | * * * UPDATE 7/20/94 AT 17:02 FROM PINZON TAKEN BY SEBROSKY * * * | | THE LICENSEE WANTED TO CORRECT THE INITIAL REPORT. THE THREE VALVES IN | | QUESTION WERE IN A LOCKED THROTTLED POSITION INSTEAD OF A CLOSED POSITION | | AND THE LICENSEE CONCLUDED THAT AN EQUIPMENT CLEARANCE ORDER IS NOT | | APPROPRIATE TO CONSIDER THE VALVE SECURED. | | | | THE LICENSEE HAS INFORMED THE RESIDENT INSPECTOR. | +------------------------------------------------------------------------------+ +----------------------------------+ +-----------------------+ |POWER REACTOR | |EVENT NUMBER: 27555 | +----------------------------------+ +-----------------------+ +------------------------------------------------+-----------------------------+ |FACILITY: CALVERT CLIFFS REGION: 1 |NOTIFICATION DATE: 07/20/94 | |UNIT: [1] [2] [ ] STATE: MD |NOTIFICATION TIME: 15:39 [ET]| |RX TYPE: [1] CE,[2] CE |EVENT DATE: 07/20/94 | +------------------------------------------------+EVENT TIME: 15:15[EDT]| |NRC NOTIFIED BY: DAVE FRYE |LAST UPDATE DATE: 07/20/94 | |HQ OPS OFFICER: JOSEPH SEBROSKY +-----------------------------+ +------------------------------------------------+ NOTIFICATIONS | |EMERGENCY CLASS: NOT APPLICABLE +-----------------------------+ |10 CFR SECTION: |WILLIAM LAZARUS 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 HOT STANDBY | 0 HOT STANDBY | | 2 | N Y 100 POWER OPERATION | 100 POWER OPERATION | | | | | +-----+---------------------------------------------+--------------------------+ EVENT TEXT +------------------------------------------------------------------------------+ | OFFSITE NOTIFICATION DUE TO LOSS OF A CONTINUOUS OXYGEN MONITOR FOR THE | | CIRC WATER INTAKE. | | | | THE LICENSEE NOTIFIED THE MARYLAND DEPARTMENT OF THE ENVIRONMENT THAT THE | | CONTINUOUS OXYGEN MONITOR FOR THE CIRCULATING WATER INTAKE WAS OUT OF | | SERVICE. THE NOTIFICATION IS REQUIRED BY THE LICENSEE'S NPDES PERMIT. THE | | LICENSEE EXPECTS THE EQUIPMENT WILL BE RETURNED TO SERVICE SOMETIME | | TOMORROW. | | | | THE LICENSEE HAS INFORMED THE RESIDENT INSPECTOR. | +------------------------------------------------------------------------------+ +----------------------------------+ +-----------------------+ |POWER REACTOR | |EVENT NUMBER: 27556 | +----------------------------------+ +-----------------------+ +------------------------------------------------+-----------------------------+ |FACILITY: VERMONT YANKEE REGION: 1 |NOTIFICATION DATE: 07/20/94 | |UNIT: [1] [ ] [ ] STATE: VT |NOTIFICATION TIME: 20:35 [ET]| |RX TYPE: [1] GE-4 |EVENT DATE: 07/20/94 | +------------------------------------------------+EVENT TIME: 18:30[EDT]| |NRC NOTIFIED BY: JIM BROOKS |LAST UPDATE DATE: 07/20/94 | |HQ OPS OFFICER: JOSEPH SEBROSKY +-----------------------------+ +------------------------------------------------+ NOTIFICATIONS | |EMERGENCY CLASS: NOT APPLICABLE +-----------------------------+ |10 CFR SECTION: |WILLIAM LAZARUS 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 100 POWER OPERATION | 100 POWER OPERATION | | | | | | | | | +-----+---------------------------------------------+--------------------------+ EVENT TEXT +------------------------------------------------------------------------------+ | A SWAP OF POWER SUPPLIES FOR THE VITAL BUS CAUSED A PARTIAL ISOLATION | | SIGNAL FOR GROUPS 2 & 3. | | | | THE PARTIAL ISOLATION SIGNAL CAUSED THE "B" SIDE VALVES TO CLOSE FOR GROUPS | | 2 & 3. GROUP 2 VALVES INCLUDE RHR SAMPLE VALVES, DRYWELL EQUIPMENT SUMP | | DRAIN VALVES, RHR TO TORUS COOLING VALVES AND GROUP 3 VALVES INCLUDE | | CONTAINMENT PURGE VALVES, CONTAINMENT INERTING PURGE VALVES, REACTOR | | BUILDING SUPPLY AND VENT VALVES, AND HVAC VALVES. THE SIGNAL HAS BEEN | | RESET AND ALL THE VALVES AFFECTED HAVE BEEN RETURNED TO THEIR NORMAL | | POSITIONS. | | | | THE LICENSEE IS INVESTIGATING THE CAUSE OF THE SWAP OF THE POWER SUPPLIES | | FOR THE VITAL BUS. NORMALLY THE VITAL BUS IS SUPPLIED POWER FROM AN MG SET | | AND THE ALTERNATE POWER SUPPLY IS MOTOR CONTROL CENTER 9A. AT THE TIME OF | | THE SWAP TO THE ALTERNATE POWER SUPPLY THERE WERE THUNDERSTORMS MOVING | | THROUGH THE AREA. THE LICENSEE SUSPECTS THAT THIS MAY HAVE BEEN THE CAUSE | | OF THE PROBLEM. | | | | THE GRID IS STABLE AND ALL ECCS AND EDGS ARE OPERABLE. NO OTHER BUSSES | | SEEM TO HAVE BEEN AFFECTED BY THE THUNDERSTORM. | | | | THE LICENSEE HAS INFORMED THE RESIDENT INSPECTOR AND WILL INFORM STATE | | OFFICIALS. | +------------------------------------------------------------------------------+