U.S. Nuclear Regulatory Commission Operations Center Event Reports For 04/24/96 - 04/25/96 ** EVENT NUMBERS ** 30170 30342 30351 30352 30353 30354 30355 30356 30357 !!!!!!!!! THIS EVENT HAS BEEN RETRACTED. THIS EVENT HAS BEEN RETRACTED !!!!!!! +----------------------------------+ +-----------------------+ |POWER REACTOR | |EVENT NUMBER: 30170 | +----------------------------------+ +-----------------------+ +------------------------------------------------+-----------------------------+ |FACILITY: WATTS BAR REGION: 2 |NOTIFICATION DATE: 03/26/96 | |UNIT: [1] [ ] [ ] STATE: TN |NOTIFICATION TIME: 12:15 [ET]| |RX TYPE: [1] W-4-LP,[2] W-4-LP |EVENT DATE: 03/26/96 | +------------------------------------------------+EVENT TIME: 08:55[EST]| |NRC NOTIFIED BY: WALLACE |LAST UPDATE DATE: 04/24/96 | |HQ OPS OFFICER: BOB STRANSKY +-----------------------------+ +------------------------------------------------+ NOTIFICATIONS | |EMERGENCY CLASS: NOT APPLICABLE +-----------------------------+ |10 CFR SECTION: |BELISLE RDO | |AIND 50.72(b)(2)(iii)(D) ACCIDENT MITIGATION | | |NLCO TECH SPEC LCO A/S | | | | | | | | | | | +-----+----------+-------+--------+--------------+--+--------+-----------------+ |UNIT |SCRAM CODE|RX CRIT|INIT PWR| INIT RX MODE |CURR PWR| CURR RX MODE | +-----+----------+-------+--------+-----------------+--------+-----------------+ | 1 | N Y 43 POWER OPERATION | 43 POWER OPERATION | | | | | | | | | +-----+---------------------------------------------+--------------------------+ EVENT TEXT +------------------------------------------------------------------------------+ | EMERGENCY GAS TREATMENT SYSTEM CONTROL SWITCHES MISALIGNED | | | | THE FOLLOWING IS TEXT OF A FACSIMILE SUBMITTED BY THE LICENSEE: | | | | "WATTS BAR NUCLEAR PLANT IS IN MODE 1 AT 43% REACTOR POWER AND 475 MWe. AT | | 0855, DURING A SYSTEM WALKDOWN, IT WAS DISCOVERED THAT HAND-SWITCHES FOR | | BOTH TRAINS OF THE EMERGENCY GAS TREATMENT SYSTEM (EGTS) PRESSURE CONTROL | | ISOLATION DAMPERS WERE IN THE A-AUTO STANDBY POSITION. THE EGTS IS USED TO | | PROCESS AIR THROUGH HEPA FILTERS PRIOR TO RELEASE TO ATMOSPHERE DURING | | ACCIDENT CONDITIONS. NORMAL ALIGNMENT REQUIRES ONE TRAIN TO BE IN THE | | A-AUTO POSITION. WITH THE SWITCHES IN THE AS-DISCOVERED ALIGNMENT, THE | | EGTS WOULD STILL FUNCTION DURING AN ACCIDENT TO MAINTAIN NEGATIVE PRESSURE | | AND FILTER EFFLUENT. HOWEVER, THE SYSTEM WOULD NOT HAVE MET THE FLOW RATE | | IN THE REQUIRED SURVEILLANCE TIME (T.S. 3.6.9). THE AIR INLEAKAGE COULD | | HAVE EXCEEDED THE 250 CFM LIMIT REQUIRED BY TECHNICAL SPECIFICATIONS (T.S. | | 3.6.15) WITH BOTH SETS OF PRESSURE CONTROL DAMPERS IN SERVICE. UPON | | DISCOVERY, TECHNICAL SPECIFICATION 3.0.3 WAS ENTERED. THE SWITCHES WERE | | RETURNED TO THE STANDBY ALIGNMENT AND TECHNICAL SPECIFICATION 3.0.3 WAS | | EXITED. THE CAUSE OF THE MISALIGNMENT IS CURRENTLY UNDER INVESTIGATION." | | | | THE NRC RESIDENT INSPECTOR HAS BEEN INFORMED OF THIS EVENT BY THE LICENSEE. | | | | * * * UPDATE 1530 4/24/96 FROM PACE TAKEN BY STRANSKY * * * | | | | LICENSEE IS RETRACTING THIS NOTIFICATION. THE FOLLOWING IS TEXT OF A | | FACSIMILE SUBMITTED BY THE LICENSEE: | | | | " ENGINEERING EVALUATION OF THIS CONDITION HAS DETERMINED THAT THE EGTS | | WOULD HAVE PERFORMED ITS SAFETY FUNCTION WITH BOTH SWITCHES IN THE STANDBY | | POSITION ALTHOUGH WITHIN 94 SECONDS RATHER THAN THE REQUIRED 20 SECONDS OF | | TECHNICAL SPECIFICATION 3.6.9.4. THEREFORE, TVA HAS DETERMINED THAT ONLY | | ONE TRAIN OF EGTS WAS INOPERABLE AND THAT ENTRY INTO TS 3.0.3 WAS NOT | | NECESSARY. TVA NO LONGER BELIEVES THAT THE REPORTED CONDITION ON MARCH 26, | | 1996 MEETS THE REPORTING CRITERIA OF 10 CFR 50.72(b)(2)(ii)(D), AND, | | THEREFFORE, WITHDRAWS THE SUBJECT NOTIFICAITON." | | | | THE NRC RESIDENT INSPECTOR HAS BEEN INFORMED BY THE LICENSEE. NOTIFIED | | R2DO (LESSER). | +------------------------------------------------------------------------------+ +----------------------------------+ +-----------------------+ |POWER REACTOR | |EVENT NUMBER: 30342 | +----------------------------------+ +-----------------------+ +------------------------------------------------+-----------------------------+ |FACILITY: SURRY REGION: 2 |NOTIFICATION DATE: 04/23/96 | |UNIT: [1] [2] [ ] STATE: VA |NOTIFICATION TIME: 08:06 [ET]| |RX TYPE: [1] W-3-LP,[2] W-3-LP |EVENT DATE: 04/23/96 | +------------------------------------------------+EVENT TIME: 06:59[EDT]| |NRC NOTIFIED BY: DONALD HART |LAST UPDATE DATE: 04/24/96 | |HQ OPS OFFICER: LEIGH TROCINE +-----------------------------+ +------------------------------------------------+ NOTIFICATIONS | |EMERGENCY CLASS: NOT APPLICABLE +-----------------------------+ |10 CFR SECTION: |CHARLES CASTO RDO | |AARC 50.72(b)(1)(v) OTHER ASMT/COMM 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 | | 2 | N Y 100 POWER OPERATION | 100 POWER OPERATION | | | | | +-----+---------------------------------------------+--------------------------+ EVENT TEXT +------------------------------------------------------------------------------+ | FAILURE OF THE EMERGENCY RESPONSE FACILITY COMPUTER SYSTEM COMPUTER | | | | THE EMERGENCY RESPONSE FACILITY COMPUTER SYSTEM (ERFCS) COMPUTER FAILED AT | | 0659. ATTEMPTS TO REBOOT THE COMPUTER THUS FAR HAVE BEEN UNSUCCESSFUL, AND | | TROUBLESHOOTING EFFORTS ARE CURRENTLY UNDERWAY. INDICATIONS ARE THAT LOW | | VOLTAGE IS THE CAUSE OF THE FAILURE. | | | | THE ERFCS COMPUTER IS USED AS AN ACCIDENT ASSESSMENT CAPABILITY TOOL TO | | MONITOR PLANT CRITICAL PARAMETERS. IT IS ALSO USED AS AN ALTERNATE MEANS | | OF INDICATION DURING NORMAL PLANT OPERATIONS. ALTHOUGH THE LICENSEE | | CONSIDERS THIS TO BE A MAJOR LOSS OF EMERGENCY ASSESSMENT CAPABILITY, THE | | PRIMARY MEANS OF INDICATION (THE CONTROL ROOM PANELS AND ANNUNCIATORS) IS | | AVAILABLE. | | | | THE LICENSEE WILL NOTIFY THE NRC RESIDENT INSPECTOR. | | | | * * * UPDATE 1518 4/24/96 FROM SMITH TAKEN BY STRANSKY * * * | | | | THE LICENSEE REPORTED THAT THE CAUSE OF THE ERFCS FAILURE WAS A LOOSE | | CONNECTION IN THE SUPPLY TRANSFORMER. THE ERFCS COMPUTER WAS RESTORED TO | | SERVICE AT 0816 ON 4/23/96. THE NRC RESIDENT INSPECTOR HAS BEEN INFORMED. | | NOTIFIED R2DO (LESSER). | +------------------------------------------------------------------------------+ +----------------------------------+ +-----------------------+ |POWER REACTOR | |EVENT NUMBER: 30351 | +----------------------------------+ +-----------------------+ +------------------------------------------------+-----------------------------+ |FACILITY: HATCH REGION: 2 |NOTIFICATION DATE: 04/24/96 | |UNIT: [1] [ ] [ ] STATE: GA |NOTIFICATION TIME: 08:42 [ET]| |RX TYPE: [1] GE-4,[2] GE-4 |EVENT DATE: 04/24/96 | +------------------------------------------------+EVENT TIME: 02:40[EDT]| |NRC NOTIFIED BY: BRUCE BUTLER |LAST UPDATE DATE: 04/24/96 | |HQ OPS OFFICER: DOUG WEAVER +-----------------------------+ +------------------------------------------------+ NOTIFICATIONS | |EMERGENCY CLASS: NOT APPLICABLE +-----------------------------+ |10 CFR SECTION: |MARK LESSER 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 COLD SHUTDOWN | 0 COLD SHUTDOWN | | | | | | | | | +-----+---------------------------------------------+--------------------------+ EVENT TEXT +------------------------------------------------------------------------------+ | ESF ACTUATION - AUTOSTART OF AN EMERGENCY DIESEL | | | | DURING THE PERFORMANCE OF THE LOGIC SYSTEM FUNCTIONAL TEST FOR THE "B" LOOP | | OF LPCI, AN UNDERVOLTAGE RELAY ON A 4160 VAC BUS WAS NOTED TO HAVE FAILED. | | THE LICENSEE THEN BEGAN BACKING OUT OF THE TEST PROCEDURE. UPON PLACING | | THE CONTROL SWITCH FOR THE "1A" EDG IN THE AUTO POSITION, THE "1A" EDG | | STARTED. THE DIESEL STARTED BUT DID NOT LOAD ON TO THE BUS AS POWER WAS | | STILL BEING SUPPLIED TO THE BUS FROM ITS NORMAL SOURCE. THE DIESEL HAS | | BEEN SECURED AND RETURNED TO STANDBY. THE LICENSEE BELIEVES THE EDG | | AUTOSTARTED BECAUSE OF THE FAILURE OF THE UNDERVOLTAGE RELAY MENTIONED | | ABOVE. INVESTIGATION CONTINUES. | | | | THIS NOTIFICATION WAS MADE LATE. THE NIGHT SHIFT DID NOT THINK A 50.72 | | NOTIFICATION WAS REQUIRED. UPON FURTHER REVIEW, THE LICENSEE DECIDED THIS | | EVENT WAS REPORTABLE. | | | | THE LICENSEE WILL INFORM THE NRC RESIDENT INSPECTOR. | +------------------------------------------------------------------------------+ +----------------------------------+ +-----------------------+ |POWER REACTOR | |EVENT NUMBER: 30352 | +----------------------------------+ +-----------------------+ +------------------------------------------------+-----------------------------+ |FACILITY: VERMONT YANKEE REGION: 1 |NOTIFICATION DATE: 04/24/96 | |UNIT: [1] [ ] [ ] STATE: VT |NOTIFICATION TIME: 15:09 [ET]| |RX TYPE: [1] GE-4 |EVENT DATE: 04/24/96 | +------------------------------------------------+EVENT TIME: 14:20[EDT]| |NRC NOTIFIED BY: A. WISNIEWSKI |LAST UPDATE DATE: 04/24/96 | |HQ OPS OFFICER: BOB STRANSKY +-----------------------------+ +------------------------------------------------+ NOTIFICATIONS | |EMERGENCY CLASS: NOT APPLICABLE +-----------------------------+ |10 CFR SECTION: |KELLY 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 100 POWER OPERATION | 100 POWER OPERATION | | | | | | | | | +-----+---------------------------------------------+--------------------------+ EVENT TEXT +------------------------------------------------------------------------------+ | TWO FIRE SUPPRESSION SYSTEMS DO NOT MEET DESIGN BASIS REQUIREMENTS. | | | | THE LICENSEE HAS DETERMINED THAT TWO PLANT FIRE SUPPRESSION SYSTEMS DO NOT | | MEET THEIR DESIGN REQUIREMENTS. SPECIFICALLY, THE RECIRCULATION SYSTEM | | MOTOR/GENERATOR SET FOAM NOZZLES ARE NOT SPACED PROPERLY TO DELIVER THE | | REQUIRED FOAM SPRAY PATTERN, AND THE REACTOR BUILDING 252' ELEVATION | | SPRINKLER NOZZLES MAY NOT PRODUCE ADEQUATE FLOW BECAUSE A SECTION OF PIPE | | WAS OMITTED IN THE ORIGINAL DESIGN CALCULATIONS. | | | | THE LICENSEE HAS ESTABLISHED AN HOURLY FIRE WATCH IN EACH AREA, AND IS | | EVALUATING DESIGN CHANGES TO CORRECT THE PROBLEMS. THE NRC RESIDENT | | INSPECTOR HAS BEEN INFORMED BY THE LICENSEE. | +------------------------------------------------------------------------------+ +----------------------------------+ +-----------------------+ |OTHER NUCLEAR MATERIAL | |EVENT NUMBER: 30353 | +----------------------------------+ +-----------------------+ +------------------------------------------------+-----------------------------+ |LICENSEE: U.S. DEPARTMENT OF THE ARMY |NOTIFICATION DATE: 04/24/96 | | CITY: LAS CRUCES REGION: 4 |NOTIFICATION TIME: 16:47 [ET]| | COUNTY: STATE: NM |EVENT DATE: 04/23/96 | |LICENSE#: 30-02405-10 AGREEMENT: Y |EVENT TIME: 15:00[MDT]| | DOCKET: |LAST UPDATE DATE: 04/24/96 | | +-----------------------------+ | |PERSON ORGANIZATION| | |PELLET RDO | | | | +------------------------------------------------+ | |NRC NOTIFIED BY: GEORGE WINNS | | |HQ OPS OFFICER: BOB STRANSKY | | +------------------------------------------------+ | |EMERGENCY CLASS: NOT APPLICABLE | | |10 CFR SECTION: | | |IBDB 30.50(b)(4)(ii) DAMAGED LNM/CONTAINER | | | | | | | | | | | | | | +------------------------------------------------+-----------------------------+ EVENT TEXT +------------------------------------------------------------------------------+ | LEAKING SEALED CO-60 SOURCE | | | | THE LICENSEE REPORTED THAT A 2,000 Ci SEALED Co-60 SOURCE IS LEAKING ABOVE | | THE LIMITS CONTAINED IN THE LICENSE. THE SOURCE IS A COBALT SLUG THAT HAS | | BEEN TRIPLE ENCAPSULATED. THE LICENSEE STATED THAT THE HIGHEST READING | | OBTAINED FROM SMEARS WAS 0.1 ęCi. THE LICENSEE BEGAN TO SUSPECT THAT THE | | SOURCE WAS LEAKING AFTER DETECTING INCREASED ACTIVITY IN THE TUBE WHICH IS | | USED TO MOVE THE SOURCE. NO FACILITY CONTAMINATION OR RELEASE OF ACTIVITY | | TO THE ENVIRONMENT HAVE OCCURRED. | +------------------------------------------------------------------------------+ +----------------------------------+ +-----------------------+ |POWER REACTOR | |EVENT NUMBER: 30354 | +----------------------------------+ +-----------------------+ +------------------------------------------------+-----------------------------+ |FACILITY: BRAIDWOOD REGION: 3 |NOTIFICATION DATE: 04/24/96 | |UNIT: [1] [2] [ ] STATE: IL |NOTIFICATION TIME: 16:52 [ET]| |RX TYPE: [1] W-4-LP,[2] W-4-LP |EVENT DATE: 04/24/96 | +------------------------------------------------+EVENT TIME: 15:05[CDT]| |NRC NOTIFIED BY: ROONEY |LAST UPDATE DATE: 04/24/96 | |HQ OPS OFFICER: BOB STRANSKY +-----------------------------+ +------------------------------------------------+ NOTIFICATIONS | |EMERGENCY CLASS: NOT APPLICABLE +-----------------------------+ |10 CFR SECTION: |FARBER RDO | |DDDD 73.71 UNSPECIFIED PARAGRAPH | | | | | | | | | | | | | | +-----+----------+-------+--------+--------------+--+--------+-----------------+ |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 N 0 COLD SHUTDOWN | 0 COLD SHUTDOWN | | | | | +-----+---------------------------------------------+--------------------------+ EVENT TEXT +------------------------------------------------------------------------------+ | ACTUAL INTRODUCTION OF CONTRABAND INTO PROTECTED AREA BY CONTRACT EMPLOYEE. | | NO HOSTILE INTENT WAS INVOLVED. SEE HOO LOG FOR DETAILS. THE NRC RESIDENT | | INSPECTOR HAS BEEN INFORMED BY THE LICENSEE. | +------------------------------------------------------------------------------+ +----------------------------------+ +-----------------------+ |POWER REACTOR | |EVENT NUMBER: 30355 | +----------------------------------+ +-----------------------+ +------------------------------------------------+-----------------------------+ |FACILITY: CALVERT CLIFFS REGION: 1 |NOTIFICATION DATE: 04/24/96 | |UNIT: [1] [ ] [ ] STATE: MD |NOTIFICATION TIME: 17:20 [ET]| |RX TYPE: [1] CE,[2] CE |EVENT DATE: 04/24/96 | +------------------------------------------------+EVENT TIME: 15:15[EDT]| |NRC NOTIFIED BY: GROOMS |LAST UPDATE DATE: 04/24/96 | |HQ OPS OFFICER: BOB STRANSKY +-----------------------------+ +------------------------------------------------+ NOTIFICATIONS | |EMERGENCY CLASS: NOT APPLICABLE +-----------------------------+ |10 CFR SECTION: |KELLY RDO | |AINB 50.72(b)(2)(iii)(B) POT RHR INOP | | |AIND 50.72(b)(2)(iii)(D) ACCIDENT MITIGATION | | | | | | | | | | | +-----+----------+-------+--------+--------------+--+--------+-----------------+ |UNIT |SCRAM CODE|RX CRIT|INIT PWR| INIT RX MODE |CURR PWR| CURR RX MODE | +-----+----------+-------+--------+-----------------+--------+-----------------+ | 1 | N N 0 REFUELING | 0 REFUELING | | | | | | | | | +-----+---------------------------------------------+--------------------------+ EVENT TEXT +------------------------------------------------------------------------------+ | LICENSEE DISCOVERED TWO HOLES IN CONTAINMENT SUMP SCREEN | | | | AT 1230 ON 4/22/96, DURING AN INSPECTION OF THE CONTAINMENT EMERGENCY SUMP | | IN RESPONSE TO OE-7797, THE LICENSEE FOUND TWO 3"x6" HOLES IN THE BACK SIDE | | OF THE SUMP SCREEN. THE FSAR ASSUMES THAT HOLES IN THE SCREEN ARE LESS THAN | | 0.244" IN SIZE. THE LICENSEE STATED THAT THE HOLES ARE 'C' CHANNELS FROM | | ORIGINAL CONSTRUCTION THAT WERE CUT TO ALLOW TUBING TO PASS THROUGH THE | | SCREENS INTO THE SUMP. THE LICENSEE PLANS TO REPAIR THE SCREENS BEFORE | | STARTING UP. | | | | THE LICENSEE DETERMINED THAT THIS EVENT WAS REPORTABLE AT 1515 ON 4/24/96. | | THE NRC RESIDENT INSPECTOR HAS BEEN INFORMED BY THE LICENSEE. | +------------------------------------------------------------------------------+ +----------------------------------+ +-----------------------+ |POWER REACTOR | |EVENT NUMBER: 30356 | +----------------------------------+ +-----------------------+ +------------------------------------------------+-----------------------------+ |FACILITY: RIVER BEND REGION: 4 |NOTIFICATION DATE: 04/24/96 | |UNIT: [1] [ ] [ ] STATE: LA |NOTIFICATION TIME: 18:09 [ET]| |RX TYPE: [1] GE-6 |EVENT DATE: 04/24/96 | +------------------------------------------------+EVENT TIME: 14:00[CDT]| |NRC NOTIFIED BY: BOYLE |LAST UPDATE DATE: 04/24/96 | |HQ OPS OFFICER: BOB STRANSKY +-----------------------------+ +------------------------------------------------+ NOTIFICATIONS | |EMERGENCY CLASS: NOT APPLICABLE +-----------------------------+ |10 CFR SECTION: |PELLET 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 +------------------------------------------------------------------------------+ | LICENSEE NOTIFIED STATE THAT SEWAGE DISCHARGE EXCEEDED NPDES LIMITS | | | | THE LICENSEE NOTIFIED THE STATE OF LOUISIANA THAT THE SEWAGE DISCHARGE | | EXCEEDED THE NPDES LIMITS FOR FECAL COLIFORM CONCENTRATION. THE | | CONCENTRATIONS MEASURED AT OUTFALL 004 WERE AS FOLLOWS: 493 COLONY-FORMING | | UNITS (CFU) MAXIMUM CONCENTRATION (MAXIMUM LIMIT 400 CFU), AND 422 CFU | | DAILY AVERAGE CONCENTRATION (DAILY AVERAGE LIMIT 200 CFU). THE NRC | | RESIDENT INSPECTOR HAS BEEN INFORMED BY THE LICENSEE. | +------------------------------------------------------------------------------+ +----------------------------------+ +-----------------------+ |POWER REACTOR | |EVENT NUMBER: 30357 | +----------------------------------+ +-----------------------+ +------------------------------------------------+-----------------------------+ |FACILITY: SEQUOYAH REGION: 2 |NOTIFICATION DATE: 04/24/96 | |UNIT: [ ] [2] [ ] STATE: TN |NOTIFICATION TIME: 21:08 [ET]| |RX TYPE: [1] W-4-LP,[2] W-4-LP |EVENT DATE: 04/24/96 | +------------------------------------------------+EVENT TIME: 17:41[EDT]| |NRC NOTIFIED BY: LEIB |LAST UPDATE DATE: 04/24/96 | |HQ OPS OFFICER: BOB STRANSKY +-----------------------------+ +------------------------------------------------+ NOTIFICATIONS | |EMERGENCY CLASS: NOT APPLICABLE +-----------------------------+ |10 CFR SECTION: |LESSER 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 REFUELING | 0 REFUELING | | | | | +-----+---------------------------------------------+--------------------------+ EVENT TEXT +------------------------------------------------------------------------------+ | CONTAINMENT PHASE B ISOLATION DURING COMPUTER MODIFICATIONS | | | | WITH CHANNEL I OF HI-HI CONTAINMENT PRESSURE MANUALLY TRIPPED TO SUPPORT | | COMPUTER SYSTEM MODIFICATIONS, AN INSTRUMENT RACK FOR CHANNEL III WAS | | REENERGIZED, CAUSING THE CHANNEL III HI-HI CONTAINMENT PRESSURE BISTABLE TO | | MOMENTARILY TRIP. COINCIDENT TRIPPING OF TWO BISTABLES SATISFIED THE LOGIC | | FOR A CONTAINMENT PHASE B ISOLATION. THE LICENSEE REPORTED THAT THE | | FOLLOWING SYSTEMS ISOLATED: CONTROL AIR TO CONTAINMENT, CONTAINMENT | | VENTILATION, CONTAINMENT RADIATION SAMPLING, ESSENTIAL RAW COOLING WATER, | | COMPONENT COOLING WATER, GLYCOL, AND RADIOACTIVE WASTEWATER DISPOSAL. ALL | | SYSTEMS FUNCTIONED AS EXPECTED. THE NRC RESIDENT INSPECTOR HAS BEEN | | INFORMED BY THE LICENSEE. | +------------------------------------------------------------------------------+