U.S. Nuclear Regulatory Commission Operations Center Event Reports For 05/13/96 - 05/14/96 ** EVENT NUMBERS ** 30413 30457 30458 30459 30460 30461 30462 !!!!!!!!! THIS EVENT HAS BEEN RETRACTED. THIS EVENT HAS BEEN RETRACTED !!!!!!! +----------------------------------+ +-----------------------+ |POWER REACTOR | |EVENT NUMBER: 30413 | +----------------------------------+ +-----------------------+ +------------------------------------------------+-----------------------------+ |FACILITY: WASHINGTON NUCLEAR REGION: 4 |NOTIFICATION DATE: 05/04/96 | |UNIT: [2] [ ] [ ] STATE: WA |NOTIFICATION TIME: 06:24 [ET]| |RX TYPE: [2] GE-5 |EVENT DATE: 05/04/96 | +------------------------------------------------+EVENT TIME: 01:42[PDT]| |NRC NOTIFIED BY: FLOOD |LAST UPDATE DATE: 05/13/96 | |HQ OPS OFFICER: CHAUNCEY GOULD +-----------------------------+ +------------------------------------------------+ NOTIFICATIONS | |EMERGENCY CLASS: NOT APPLICABLE +-----------------------------+ |10 CFR SECTION: |PHIL HARRELL 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 +------------------------------------------------------------------------------+ | AUTOMATIC START OF THE #2 EMERGENCY DIESEL GENERATOR (EDG) DUE TO AN | | UNDERVOLTAGE CONDITION | | | | AT 0142, VITAL BUS "SM-8" DE-ENERGIZED FOR UNKNOWN REASONS CAUSING THE #2 | | EDG TO AUTOMATICALLY START. HOWEVER, THE EDG DID NOT LOAD BECAUSE THE | | BACKUP TRANSFORMER PROVIDED POWER TO THE "SM-8" BUS AUTOMATICALLY AFTER THE | | INITIAL POWER LOST. SUBSEQUENT PRELIMINARY INVESTIGATION REVEALED THAT AN | | EQUIPMENT OPERATOR CLOSED THE DOOR OF THE ELECTRICAL AUXILIARY CABINET | | ASSOCIATED WITH THE NORMAL POWER SUPPLY TO BUS "SM-8" (BUS "SM-3") AS PART | | OF A CLEARANCE ORDER (TAG OUT) PROCESS. A RELAY OR RELAYS WERE JARRED BY | | THE DOOR CLOSURE POSSIBLY CAUSING THE NORMAL POWER SUPPLY BREAKER TO OPEN | | AND RESULTING IN THE AUTOMATIC START OF THE #2 EDG. | | | | THE LICENSEE IS STILL INVESTIGATING THE CAUSE. DURING THE LOSS OF POWER TO | | THE BUS, THE UNIT ALSO LOST A RESIDUAL HEAT REMOVAL PUMP, WHICH WAS IN THE | | FUEL POOL COOLING ASSIST MODE, FOR APPROXIMATELY 20 MINUTES. HOWEVER, NO | | INCREASE IN FUEL POOL TEMPERATURE WAS NOTED. (THE UNIT IS CURRENTLY | | DEFUELED.) | | | | THE NRC RESIDENT INSPECTOR WAS INFORMED. | | | | * * * 1607 MAY 13, 1996, UPDATE FROM JOHNSON TAKEN BY TROCINE * * * | | | | THE LICENSEE IS RETRACTING THIS EVENT BECAUSE THE FINAL SAFETY ANALYSIS | | REPORT DOES NOT SPECIFY THE EDG AS AN ENGINEERED SAFETY FEATURE (ESF) | | SYSTEM. THEREFORE, THE LICENSEE DOES NOT CONSIDER THIS EVENT TO BE AN ESF | | ACTUATION. IN ADDITION, THE LICENSEE REVIEWED THE ISOLATIONS AND | | ACTUATIONS THAT OCCURRED AS A RESULT OF THE LOSS OF POWER AND CONFIRMED | | THEM TO BE EXEMPT FROM THE REPORTING REQUIREMENTS AS WELL. THE CAUSE OF | | THIS EVENT IS STILL UNDER INVESTIGATION. | | | | THE LICENSEE WILL NOTIFY THE NRC RESIDENT INSPECTOR AND CURRENTLY PLANS TO | | ISSUE A VOLUNTARY LICENSEE EVENT REPORT REGARDING THIS EVENT. THE NRC | | OPERATIONS CENTER NOTIFIED THE R4DO (HARRELL). | +------------------------------------------------------------------------------+ +----------------------------------+ +-----------------------+ |POWER REACTOR | |EVENT NUMBER: 30457 | +----------------------------------+ +-----------------------+ +------------------------------------------------+-----------------------------+ |FACILITY: MILLSTONE REGION: 1 |NOTIFICATION DATE: 05/13/96 | |UNIT: [ ] [ ] [3] STATE: CT |NOTIFICATION TIME: 16:31 [ET]| |RX TYPE: [1] GE-3,[2] CE,[3] W-4-LP |EVENT DATE: 05/13/96 | +------------------------------------------------+EVENT TIME: 16:15[EDT]| |NRC NOTIFIED BY: JOSEPH FRANKS |LAST UPDATE DATE: 05/13/96 | |HQ OPS OFFICER: LEIGH TROCINE +-----------------------------+ +------------------------------------------------+ NOTIFICATIONS | |EMERGENCY CLASS: NOT APPLICABLE +-----------------------------+ |10 CFR SECTION: |ANIELLO DELLA GRECA RDO | |AUNA 50.72(b)(1)(ii)(A) UNANALYZED COND OP | | | | | | |PHIL HARRELL, REG 4 R4DO | | | | | | | +-----+----------+-------+--------+--------------+--+--------+-----------------+ |UNIT |SCRAM CODE|RX CRIT|INIT PWR| INIT RX MODE |CURR PWR| CURR RX MODE | +-----+----------+-------+--------+-----------------+--------+-----------------+ | | | | | | | | | 3 | N N 0 COLD SHUTDOWN | 0 COLD SHUTDOWN | +-----+---------------------------------------------+--------------------------+ EVENT TEXT +------------------------------------------------------------------------------+ | INADEQUATE DESIGN RESULTING IN THE POTENTIAL FOR MODIFIED ROD CONTROL | | SYSTEM POWER SUPPLIES TO RESET AFTER 200 MILLISECONDS, WHICH COULD CAUSE | | CONTROL RODS TO BEGIN INSERTING AND TO THEN GET CAUGHT AT VARIOUS POSITIONS | | IN THE CORE | | | | DUE TO SEVERAL EVENTS AT PLANTS IN THE MIDWEST WHERE LIGHTNING CAUSED | | TRANSIENTS TO ROD CONTROL SYSTEMS AND TRIPPED UNITS, THE LICENSEE INSTALLED | | AN AUTOMATIC RESET FUNCTION TO THE POWER SUPPLIES DURING THE LAST REFUELING | | OUTAGE (APRIL OR MAY OF 1995). AN OVERVOLTAGE TRANSIENT TYPICALLY LAST A | | VERY SHORT PERIOD OF TIME (ON THE ORDER OF MICROSECONDS), AND THE MODIFIED | | POWER SUPPLY WILL TRY TO RESET ITSELF IMMEDIATELY FOLLOWING THE CLEARING OF | | THE OVERVOLTAGE CONDITION. IT HAS BEEN SHOWN THAT IF A LARGE TRANSIENT IS | | RECEIVED, THE POWER SUPPLY WILL INITIALLY TRIP OFF AND WILL IMMEDIATELY TRY | | TO RESET ITSELF WHEN THE OVERVOLTAGE CONDITION HAS CLEARED. IN THIS | | SITUATION, THE CONTROL RODS WILL NOT INSERT BECAUSE THE POWER SUPPLY WILL | | RESET WITHIN 200 MILLISECONDS PER THE NEW DESIGN. MILLSTONE UNIT 3 HAS | | BEEN OPERATING WITH THIS SYSTEM CONFIGURATION FOR APPROXIMATELY THE LAST | | EIGHT MONTHS. | | | | WESTINGHOUSE RECENTLY NOTIFIED THE LICENSEE THROUGH A SAFETY ANALYSIS | | LETTER THAT CERTAIN POWER SUPPLIES IN THE ROD CONTROL SYSTEM (WHICH | | AUTOMATICALLY RESET) MAY NOT RESET WITHIN THE 200-MILLISECOND TIME FRAME. | | IF A TRANSIENT OCCURS AND IF THE POWER SUPPLY TRIES TO RESET AFTER THE | | INITIAL 200-MILLISECOND TIME FRAME, THE CONTROL RODS FOR THE APPLICABLE | | POWER CABINET WILL START TO INSERT. IF THE POWER SUPPLY THEN RE-ENERGIZES | | ITSELF WITHIN ONE SECOND AFTER THE INITIATING EVENT, THE POTENTIAL EXISTS | | FOR CONTROL RODS TO BE CAUGHT IN VARIOUS POSITIONS IN THE CORE. THE ROD | | CONTROL SYSTEM (WHICH IS NORMALLY IN AUTOMATIC) WOULD THEN TRY TO DRIVE | | RODS BASED ON PLANT CONDITIONS. | | | | THE LICENSEE BELIEVES THAT THIS IS A HISTORICAL CONDITION, AND THE UNIT IS | | NOT CURRENTLY IN ANY TECHNICAL SPECIFICATION LIMITING CONDITIONS FOR | | OPERATION BECAUSE OF THE CURRENT MODE (COLD SHUTDOWN). THE LICENSEE PLANS | | TO PERFORM MODIFICATION TO THE POWER SUPPLY PRIOR TO UNIT RESTART. | | | | THE LICENSEE DOES NOT BELIEVE THAT THIS IS A GENERIC ISSUE WITH ALL | | WESTINGHOUSE FOUR-LOOP UNITS. HOWEVER, THE LICENSEE DOES BELIEVE THAT | | COMANCHE PEAK AND SOUTH TEXAS WERE AFFECTED BY THE WESTINGHOUSE SAFETY | | ANALYSIS LETTER AND THAT THESE PLANTS WERE BOTH NOTIFIED BY WESTINGHOUSE. | | | | THE LICENSEE NOTIFIED THE NRC RESIDENT INSPECTOR AND THE APPLICABLE STATE | | AGENCY. | +------------------------------------------------------------------------------+ +----------------------------------+ +-----------------------+ |POWER REACTOR | |EVENT NUMBER: 30458 | +----------------------------------+ +-----------------------+ +------------------------------------------------+-----------------------------+ |FACILITY: MILLSTONE REGION: 1 |NOTIFICATION DATE: 05/13/96 | |UNIT: [ ] [ ] [3] STATE: CT |NOTIFICATION TIME: 18:05 [ET]| |RX TYPE: [1] GE-3,[2] CE,[3] W-4-LP |EVENT DATE: 05/13/96 | +------------------------------------------------+EVENT TIME: 17:45[EDT]| |NRC NOTIFIED BY: JOSEPH FRANKS |LAST UPDATE DATE: 05/13/96 | |HQ OPS OFFICER: LEIGH TROCINE +-----------------------------+ +------------------------------------------------+ NOTIFICATIONS | |EMERGENCY CLASS: NOT APPLICABLE +-----------------------------+ |10 CFR SECTION: |ANIELLO DELLA GRECA RDO | |AOUT 50.72(b)(1)(ii)(B) OUTSIDE DESIGN BASIS | | |NLCO TECH SPEC LCO A/S | | | | | | | | | | | +-----+----------+-------+--------+--------------+--+--------+-----------------+ |UNIT |SCRAM CODE|RX CRIT|INIT PWR| INIT RX MODE |CURR PWR| CURR RX MODE | +-----+----------+-------+--------+-----------------+--------+-----------------+ | | | | | | | | | 3 | N N 0 COLD SHUTDOWN | 0 COLD SHUTDOWN | +-----+---------------------------------------------+--------------------------+ EVENT TEXT +------------------------------------------------------------------------------+ | SHUTDOWN MARGIN MONITORS OUT OF SERVICE DUE TO THE POTENTIAL FOR | | NON-CONSERVATIVE BORON DILUTION ANALYSIS ASSUMPTIONS | | | | THE LICENSEE DISCOVERED THAT THE BORON DILUTION ANALYSIS ASSUMPTIONS WERE | | POTENTIALLY NON-CONSERVATIVE IN THAT THE GENERIC INVERSE COUNT RATE RATIO | | CURVE THAT WESTINGHOUSE USES IN ITS ANALYSIS WAS NON-CONSERVATIVE FOR | | MILLSTONE UNIT 3. AS A RESULT, THE UNIT HAS ENTERED THE LIMITING CONDITION | | FOR OPERATION UNDER TECHNICAL SPECIFICATION 3.3.1, FUNCTIONAL UNIT 21, | | ACTION 5.B. WITH BOTH SHUTDOWN MARGIN MONITORS INOPERABLE, THIS ACTION | | STATEMENT REQUIRES THE LICENSEE TO SUSPEND ALL OPERATIONS INVOLVING | | POSITIVE REACTIVITY CHANGES. IT ALLOWS THE LICENSEE FOUR HOURS TO VERIFY | | THAT A NUMBER OF VALVES IN THE DILUTION FLOW PATH ARE SECURED IN THE PROPER | | POSITION AND REQUIRES THE LICENSEE TO VERIFY SHUTDOWN REQUIREMENTS FOR THE | | APPLICABLE MODE WITHIN THE NEXT HOUR. THE LICENSEE HAS COMMENCED BOTH OF | | THESE SURVEILLANCES. IN ADDITION, THE ACTION STATEMENT REQUIRES THAT THE | | LICENSEE VERIFY THAT THESE VALVES ARE CLOSED AND SECURED EVERY 14 DAYS, AND | | VERIFY SHUTDOWN MARGIN EVERY 12 HOURS. AS A RESULT, THE LICENSEE PLANS TO | | PERFORM A SHUTDOWN MARGIN VERIFICATION ONCE PER SHIFT (EVERY EIGHT HOURS). | | THE SHUTDOWN SAFETY ASSESSMENT IS NOW ORANGE FOR REACTIVITY, AND | | CONTINGENCY PLAN PREPARATIONS ARE IN PROGRESS. | | | | THE LICENSEE NOTIFIED THE NRC RESIDENT INSPECTOR AND THE APPLICABLE STATE | | AGENCY. | +------------------------------------------------------------------------------+ +----------------------------------+ +-----------------------+ |POWER REACTOR | |EVENT NUMBER: 30459 | +----------------------------------+ +-----------------------+ +------------------------------------------------+-----------------------------+ |FACILITY: PALISADES REGION: 3 |NOTIFICATION DATE: 05/13/96 | |UNIT: [1] [ ] [ ] STATE: MI |NOTIFICATION TIME: 18:41 [ET]| |RX TYPE: [1] CE |EVENT DATE: 05/13/96 | +------------------------------------------------+EVENT TIME: 17:48[EDT]| |NRC NOTIFIED BY: MIKE KANE |LAST UPDATE DATE: 05/13/96 | |HQ OPS OFFICER: LEIGH TROCINE +-----------------------------+ +------------------------------------------------+ NOTIFICATIONS | |EMERGENCY CLASS: NOT APPLICABLE +-----------------------------+ |10 CFR SECTION: |ROY CANIANO 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 +------------------------------------------------------------------------------+ | FAILURE TO MAINTAIN A FIRE DOOR OPEN BETWEEN THE TWO SECTIONS OF THE | | CONTROL ROOM VENTILATION EQUIPMENT ROOM PER THE DESIGN BASIS | | | | DURING AND ENGINEERING REVIEW OF THE DESIGN BASIS DOCUMENTS, THE LICENSEE | | DISCOVERED THAT A FIRE DOOR BETWEEN THE TWO SECTIONS OF THE CONTROL ROOM | | VENTILATION EQUIPMENT ROOM HAS NOT BEEN MAINTAINED OPEN PER THE DESIGN | | BASIS. THIS CONDITION POTENTIALLY AFFECTS THE OPERABILITY OF THE CONTROL | | ROOM HEATING VENTILATION AND AIR CONDITIONING (HVAC) EQUIPMENT. WITHOUT | | THE FIRE DOOR OPEN TO ALLOW PRESSURIZATION OF THE OUT-OF-SERVICE HVAC TRAIN | | ROOM SECTION, LEAKAGE FROM OUTSIDE COULD POTENTIALLY ENTER THE CONTROL ROOM | | ENVELOPE. IN OTHER WORDS, THE DOOR HAS TO BE OPEN TO MAINTAIN BOTH | | SECTIONS PRESSURIZED. IF THERE IS LEAKAGE INTO THE CONTROL ROOM ENVELOPE, | | THE LICENSEE CONSIDERS BOTH TRAINS TO BE INOPERABLE. THE DOOR HAS A | | FUSIBLE LINK THAT WOULD CLOSE THE DOOR IF A FIRE OCCURRED. THE UNIT IS NOT | | CURRENTLY IN ANY TECHNICAL SPECIFICATION LIMITING CONDITIONS FOR OPERATION | | BECAUSE THE FIRE DOOR WAS OPENED PRIOR TO THE COMPLETION OF THE OPERABILITY | | DETERMINATION. | | | | THE LICENSEE NOTIFIED THE NRC RESIDENT INSPECTOR. | +------------------------------------------------------------------------------+ +----------------------------------+ +-----------------------+ |POWER REACTOR | |EVENT NUMBER: 30460 | +----------------------------------+ +-----------------------+ +------------------------------------------------+-----------------------------+ |FACILITY: ROBINSON REGION: 2 |NOTIFICATION DATE: 05/13/96 | |UNIT: [2] [ ] [ ] STATE: SC |NOTIFICATION TIME: 19:33 [ET]| |RX TYPE: [2] W-3-LP |EVENT DATE: 05/13/96 | +------------------------------------------------+EVENT TIME: 19:00[EDT]| |NRC NOTIFIED BY: DON McCASKILL |LAST UPDATE DATE: 05/13/96 | |HQ OPS OFFICER: LEIGH TROCINE +-----------------------------+ +------------------------------------------------+ NOTIFICATIONS | |EMERGENCY CLASS: UNUSUAL EVENT +-----------------------------+ |10 CFR SECTION: |JACK CRLENJAK RDO | |AAEC 50.72(a)(1)(i) EMERGENCY DECLARED |BRIAN SHERON, NRR EO | |AFIR 50.72(b)(1)(vi) FIRE (ONSITE) |GENE KANUPP FEMA | | |RICH BARRETT, ERB AEOD | | | | | | | +-----+----------+-------+--------+--------------+--+--------+-----------------+ |UNIT |SCRAM CODE|RX CRIT|INIT PWR| INIT RX MODE |CURR PWR| CURR RX MODE | +-----+----------+-------+--------+-----------------+--------+-----------------+ | 2 | N Y 100 POWER OPERATION | 100 POWER OPERATION | | | | | | | | | +-----+---------------------------------------------+--------------------------+ EVENT TEXT +------------------------------------------------------------------------------+ | DECLARATION OF AN UNUSUAL EVENT DUE TO A FIRE IN THE MECHANICAL EQUIPMENT | | ROOM OF THE CHEMISTRY BUILDING LASTING GREATER THAN TEN MINUTES | | | | AT 1848, AN AIR COMPRESSOR LOCATED IN THE MECHANICAL EQUIPMENT ROOM OF THE | | CHEMISTRY BUILDING CAUGHT FIRE. A LOCAL ALARM WAS RECEIVED, AND THE FIRE | | WAS EXTINGUISHED AT 1901 (WITHIN 13 MINUTES) VIA THE AUTOMATIC SPRINKLERS. | | THE CHEMISTRY BUILDING IS NOT ATTACHED TO THE POWER BLOCK OR THE AUXILIARY | | BUILDING, BUT IT IS LOCATED WITHIN THE PROTECTED AREA. THE LOWER LEVEL OF | | THE CHEMISTRY BUILDING IS LOCATED PRIMARILY IN THE RADIATION CONTROL AREA, | | AND THE UPPER LEVEL IS LOCATED OUTSIDE OF THE RADIATION CONTROL AREA. THE | | FIRE OCCURRED IN THE UPPER LEVEL. THE CAUSE OF THE FIRE IS CURRENTLY UNDER | | INVESTIGATION. | | | | THE LICENSEE DECLARED AN UNUSUAL EVENT AT 1900 DUE TO A FIRE INSIDE THE | | PROTECTED AREA LASTING LONGER THAN TEN MINUTES. THE UNUSUAL EVENT WAS | | TERMINATED AT 1906 WHEN THE FIRE WAS EXTINGUISHED AND THE FIRE ALARM ALL | | CLEAR WAS SOUNDED. | | | | THE LICENSEE NOTIFIED THE NRC RESIDENT INSPECTOR AND THE APPLICABLE STATE | | AND LOCAL AGENCIES. | +------------------------------------------------------------------------------+ +----------------------------------+ +-----------------------+ |POWER REACTOR | |EVENT NUMBER: 30461 | +----------------------------------+ +-----------------------+ +------------------------------------------------+-----------------------------+ |FACILITY: FERMI REGION: 3 |NOTIFICATION DATE: 05/13/96 | |UNIT: [2] [ ] [ ] STATE: MI |NOTIFICATION TIME: 20:25 [ET]| |RX TYPE: [2] GE-4 |EVENT DATE: 05/13/96 | +------------------------------------------------+EVENT TIME: 20:10[EDT]| |NRC NOTIFIED BY: JOE SKLARCZYK |LAST UPDATE DATE: 05/13/96 | |HQ OPS OFFICER: LEIGH TROCINE +-----------------------------+ +------------------------------------------------+ NOTIFICATIONS | |EMERGENCY CLASS: NOT APPLICABLE +-----------------------------+ |10 CFR SECTION: |ROY CANIANO RDO | |AOUT 50.72(b)(1)(ii)(B) OUTSIDE DESIGN BASIS | | |NLTR LICENSEE 24 HR REPORT | | | | | | | | | | | +-----+----------+-------+--------+--------------+--+--------+-----------------+ |UNIT |SCRAM CODE|RX CRIT|INIT PWR| INIT RX MODE |CURR PWR| CURR RX MODE | +-----+----------+-------+--------+-----------------+--------+-----------------+ | 2 | N Y 96 POWER OPERATION | 96 POWER OPERATION | | | | | | | | | +-----+---------------------------------------------+--------------------------+ EVENT TEXT +------------------------------------------------------------------------------+ | POTENTIAL INADEQUATE FIRE BARRIERS SEPARATING PORTIONS OF A REDUNDANT | | SYSTEM IMPORTANT TO SAFE SHUTDOWN | | | | AN ASSUMPTION USED IN THE 10 CFR PART 50, APPENDIX 'R', FIRE HAZARDS | | ANALYSIS MAY NOT BE CORRECT FOR A FIRE IN ZONE 1 OF THE AUXILIARY BUILDING | | WHICH CONTAINS BOTH DIVISIONS OF THE NON-INTERRUPTIBLE AIR SYSTEM (NIAS). | | BECAUSE SEPARATION CRITERIA FOR THE NIAS DIVISIONS ARE NOT MET, THE | | ANALYSIS ADDRESSED MANUAL ACTIONS TO BE TAKEN IN CASE OF A FIRE CAUSING THE | | LOSS OF BOTH DIVISIONS. THE ANALYSIS ASSUMED THAT ALTHOUGH NIAS IS NEEDED | | FOR THE CONTROL CENTER HEATING VENTILATION AND AIR CONDITIONING (HVAC) | | SYSTEM, THIS IS NOT A SHORT-TERM NEED. ACTIONS WERE DESCRIBED TO RESTORE | | AIR TO THE CONTROL CENTER HVAC SYSTEM THAT CAN ONLY BE ACCOMPLISHED AFTER | | THE FIRE IS OUT AND POWER IS RESTORED TO THE INTERRUPTIBLE AIR SYSTEM. | | CURRENT CALCULATIONS FOR THE CONTROL CENTER SHOW THAT AIR IS NEEDED IN THE | | SHORT TERM OR THE CONTROL CENTER WILL HEAT UP. THE LICENSING BASIS IS | | BEING RESEARCHED AND IS COMPLEX. THE AIR IS USED TO OPERATE CONTROL CENTER | | HVAC DAMPERS THAT FAIL CLOSED ON A LOSS OF AIR. ACTIONS TO MANUALLY OPEN | | THE DAMPERS ON A LOSS OF PNEUMATICS ARE ALREADY PROCEDURALIZED; HOWEVER, | | THE APPENDIX 'R' ANALYSIS DID NOT TAKE CREDIT FOR THESE ACTIONS IF A FIRE | | OCCURRED IN THE DIVISION II PORTION OF ZONE 1 OF THE AUXILIARY BUILDING | | DAMAGING BOTH DIVISIONS OF NIAS. | | | | WHILE THIS SITUATION IS BEING RESEARCHED, THE LICENSEE IS CONSERVATIVELY | | TREATING IT AS A CONDITION WHERE INADEQUATE FIRE BARRIERS EXIST SEPARATING | | PORTIONS OF A REDUNDANT SYSTEM IMPORTANT TO SAFE SHUTDOWN WITHIN A FIRE | | AREA. THE LICENSEE HAS ESTABLISHED A FIRE WATCH PATROL. | | | | THE LICENSEE NOTIFIED THE NRC RESIDENT INSPECTOR. | +------------------------------------------------------------------------------+ +----------------------------------+ +-----------------------+ |POWER REACTOR | |EVENT NUMBER: 30462 | +----------------------------------+ +-----------------------+ +------------------------------------------------+-----------------------------+ |FACILITY: SUMMER REGION: 2 |NOTIFICATION DATE: 05/14/96 | |UNIT: [1] [ ] [ ] STATE: SC |NOTIFICATION TIME: 01:54 [ET]| |RX TYPE: [1] W-3-LP |EVENT DATE: 05/14/96 | +------------------------------------------------+EVENT TIME: 00:00[EDT]| |NRC NOTIFIED BY: SIMPSON |LAST UPDATE DATE: 05/14/96 | |HQ OPS OFFICER: BOB STRANSKY +-----------------------------+ +------------------------------------------------+ NOTIFICATIONS | |EMERGENCY CLASS: NOT APPLICABLE +-----------------------------+ |10 CFR SECTION: |CRLENJAK RDO | |ADAS 50.72(b)(2)(i) DEG/UNANALYZED COND | | | | | | | | | | | | | | +-----+----------+-------+--------+--------------+--+--------+-----------------+ |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 +------------------------------------------------------------------------------+ | LEAKAGE PAST EMERGENCY FEEDWATER PUMP FLOW CONTROL VALVES COULD PLACE UNIT | | OUTSIDE OF DESIGN BASIS | | | | DURING RECENT INTEGRATED SAFEGUARDS TESTING, THE LICENSEE NOTICED | | INCREASING STEAM GENERATOR LEVELS AS A RESULT OF LEAKAGE PAST THE CLOSED | | MOTOR-DRIVEN EMERGENCY FEEDWATER PUMP FLOW CONTROL VALVES. UPON FURTHER | | INVESTIGATION, THE LICENSEE DETERMINED THAT LEAKAGE PAST THESE VALVES COULD | | PLACE THE UNIT IN AN UNANALYZED CONDITION WITH RESPECT TO THE REACTOR | | BUILDING STEAMLINE BREAK ANALYSIS. THE LICENSEE IS ALSO CONCERNED WITH | | POTENTIAL LEAKAGE PAST THE TURBINE-DRIVEN EFW FLOW CONTROL VALVES. | | | | THE LICENSEE'S INITIAL EVALUATION INDICATES THAT FOLLOWING A FAULTED STEAM | | GENERATOR ISOLATION, SOME LEAKAGE IS INITIALLY ACCEPTABLE, BUT EFW FLOW TO | | THE FAULTED S/G IS ASSUMED TO BE TERMINATED AFTER APPROXIMATELY 1800 | | SECONDS. THE LICENSEE PLANS TO DETERMINE THE ACCEPTABLE LEVEL OF LEAKAGE | | PAST THE FLOW CONTROL VALVES, AS WELL AS ANY REQUIRED CHANGES TO PLANT | | PROCEDURES. THE NRC RESIDENT INSPECTOR HAS BEEN INFORMED OF THIS EVENT BY | | THE LICENSEE. | +------------------------------------------------------------------------------+