ML18038A354
| ML18038A354 | |
| Person / Time | |
|---|---|
| Site: | Nine Mile Point  |
| Issue date: | 05/31/1991 |
| From: | NIAGARA MOHAWK POWER CORP. |
| To: | |
| Shared Package | |
| ML17058A805 | List: |
| References | |
| NUDOCS 9106190237 | |
| Download: ML18038A354 (8) | |
Text
NIAGARAMOHAWKPOWER CORPORATION NINE MILEPOINT NUCLEAR STATION UNIT ¹1 NARRATIVEOF OPERATING EXPERIENCE The Station operated during the month of May 1991 with a Unit Availability Factor of 95.8%
and a Net Design Electrical Capacity Factor of 88.2%.
There were no challenges to Electromatic Relief Valves. Reductions in Capacity Factor were due to an aborted Turbine Torsional Test on May 14, due to ¹11 Turbine Aux Oil Pump failure. The unit was reduced to 25% CTP for the test which contributed to lost generation.
The Turbine Torsional Test was rescheduled and successfully completed on May 29 and 30.
Other reductions in capacity factor were due to weekly control rod exercising and the inability to obtain 100% CTP due to turbine steam flow limitation.
CLASS I WORK - MECHANICALMAINTENANCE-May 1991 See attached printout.
CLASS I WORK - INSTRUMENTS AND CONTROLS - May 1991 See attached printout.
CLASS I WORK - ELECTRICALMAINTENANCE-May 1991 See attached printout.
9106190237 9106il PDR ADOCK 05000220 R
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06-03-91 PAGE 1
WR Number EPN Number TITLE Description Corrective Action NINEHILE POINT UNIT ONE Mechanical Haintenance
"- COHPLETED SAFETY'RELATED WRs FOR HAY W199852 68-08 REACTOR BUILDING TORUS VACUUM BREAKER NUHBER 11 W184 168 70-13R RBCLC HEAT EXCHANGER 70-13 11 W185335 72-438 BV-11 RBCLC HX TUBE SIDE. DRAIN CLC HEAT EXCHANGER 70-13R W185887 93-RW"720 DRAIN VALVE FOR HEAT EXCHANGER 80-13R W185334 W187847 94"02 210. 1-4 1R EPN 94-02 NUHBER 12 INSTRUHENT AIR COHPRESSOR CHILLEO WATER PUHP 12 PRESSURE GAUGE W199308 58-04 OOWNCOHER SUBHERGENCE TRANSHITTER WATER IS TRAPPED IN PIPE WITH VALVES 201 2-552 ANO,201.2-551 DRAIN WATER FROH VALVE TO'EMPTY THIS PIPE ELEVATION 216 BELOW 218 GRATING REACTOR BUILDING SOUTH EAST CORNER DURING PERFORMANCE OF N1-ISP-068-9002 ATTACHHENT NUHBER 2
VALVE 68-08 FAILED TO ACTUATE WITH PROPER INPUT SIGNAL WHILE ATTEHPTING TO ASSIST VALVE SWITCH THAT INDICATES OPEN POSITION WAS BROKEN VALVE NOW HAS DUAL INDICATION NUHBER 11 VACUUM BREAKER REACTOR BUILDING 237 COLUHN N-7 DEFICIENCY TAG 27322 REHOVE AN 81 INCH PLUS OR MINUS 1
INCH LONG SECTION OF TUBES IDENTIFIED IN DRAWING F"42345-C SHEET 4
REVISION 1 AS HEASUREO FROH THE NORTH ENO -
PLUG EACH END AND SEAL WELD -
SEE DRAWING F-42345-C SHEET 4 REVISION 1
DRAIN VALVE,PLUGGED NEEDS TO BE CLEANED REACTOR BUIL'DING 298 DEFICIENCY TAG 13338 DRAIN VALVE IS PLUGGED WILL NOT DRAIN OFF EAST SIDE OF HEAT EXCHANGER TUBE SIDE LOCATION REACTOR 318 NORTH HEAT EXHANGER 122 EAST END DEF TAG 17097 ON DRAIN VALVE EXHAUST TEHPERATURE IS HIGH PLEASE REPAIR - TURBINE BUILDING 261 TURBINE BUILDING 300 SOUTHEAST ISOLATION VALVE FOR 210 1-41R IS LEAKING THERE IS NO OTHER ISOLATION VALVE BEFORE IT NEEDS TO BE REPLACED DEFICIENCY TAG 23751 ON VALVE CLEANED INSIDE OF 552 AND REINSTALLED CLEANED AND POLISHED AIR CYLINDER REPLACED WIPER RINGS AND READJUSTED STROKE ABB/CE USING MOM.CUTTING METHOD CUT 60 TUBES AS INDICATED ON APPLICABLE DRA'WINGS AFTER CUT TUBES WERE REMOVED AND THEN SEAL WELDED CLEANED PIPING AND VALVE - REHOVED VALVE AND STEH TO CLEAN PIPING CLEANED VALVE SEATS AND REASSEMBLED REPLACED BODY TO BONNET GASKET REHOVED BONNET FROH BODY CLEANED SEATS AND PIPING REPLACED GASKET AND BONNET TO BODY BOLTS REASSEHBBLED VALVE AND FLUSHED AGAIN REMOVE AND REBUILD VALVES LPI-2 LPI-4 AND LPD2 LPD ALL VALVES TESTED ON TESTING HACHINE VALVE REMOVED AND REPLACED WITH NEW VALVE FROH STORES
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06-03-91 PAGE 2
'WR Number EPN Nunber TITLE DescriPtion Corrective Action NINE HILE POINT UNIT ONE Instrument 8 Controls - COMPLETED SAFETY RELATED WRs FOR HAY W188534 44-14-15 SOV 117 FOR HCU 14-15 W188598 44 2-35A SCRAH DUHP VOLUHE LEVEL SENSOR W192707 92-RJ19D W199862 94-30 APRH 17 TRIP AUXILIARY DRAWER BYPASS SWITCH 12-17B NUHBER ll INSTRUHENT AIR DRYER W188554 113-NA SCRAM AIR HEADER W192 714 W185942 201 2-218 201 2-218C OXYGEN'NALYZER NUMBER ll - CAD CHANNEL 11 02 ALARH UNIT W'192753 W188069 201 8-09 210 1-101 REACTOR CONTAINHENT.
INERT GAS SUPPLY SYSTEH NUHBER 12 ALARM UNIT TEHPORARY MODIFICATION 5343 ON 112 CHILLER COMP OIL PRESSURE SAFETY 5'W I TCH W192454 92-IRH11" 18 INTERHEDIATE RANGE
.MONI TORS SOV 117 FOR HCU 14-15 IS LEAKING DEFICIENCY TAG 37356 IS HUNG ON THE VALVE LOCATED REACTOR BUILDING 237 RECEIVED HALF SCRAH - TROUBLESHOOT OR REPAIR - REACTOR BUILDING 237 NORTH WEST INVESTIGATE THE IRHS BY GE TO OETERHINE CAUSE OF GAIN PROBLEHS ASSOCIATED WITH RANGE SWITCHES RANGE 8 LIHIT FOR IRM 16 AND 17 AND RANGE 9 LIMIT FOR IRH 12 BYPASS SWITCH FAILS TO UNBYPASS LPRH 12-178 - CONTROL ROOH G PANEL NUMBER 11 INSTRUHENT AIR DRYER IS LOW ON FREON - PLEASE REPAIR - LOCATED ON TURBINE BUILDING 291 WEST WALL DEFICIENCY TAG 27340 ON PANEL IN CONTROL ROOH PLEASE CHECK SCRAH AIR HEADER SYSTEM BACK UP SCRAH SOLENOID - INDIVIDUAL PILOT SOLENOIDS AND PIPING AND FITTING FOR LEAKS - CORRECT AS NECESSARY OXYGEN ANALYZER READS UPSCALE - PLEASE TROUBLESHOOT DURING CALIBRATION OF CHANNEL 11 02 ALARMS UPPER ALARH LED FA ILED TO LIGHT ANNUNCIATOR DID COHE IN PLEASE REPAIR DEF TAG 12667 TROUBLESHOOT TROUBLESHOOT ALARH LOOP TO OETERHINE PROBLEH REPORT 2009 DISPOSITION FOR LOADED DOWN CIRCUIT
'WHEN ALARM UNIT IS IN TRIPPED CONDITION TEHPORARY HODIFICATION 5343 AS DIRECTED BY DCR Nl-91-500LG020 - JUHPER TO BE HANUFACTUREO'SING WIRE CONSISTENT WITH FIELD WIRE TO OIL PRESSURE SAFETY SWITCH REBUILT SOV AND TIGHTENED TO HANUFACTURER SPECIFICATIONS ADJUSTED FAILURE LAMP LED TO REQUIRED VALUE - TFSTED OPERATION VIA PHT - WIP ASSISTED GE PERSONNEL AS REQUIRED TO OBTAIN INFORMATION NEEDEO FOR TROUBLESHOOTING RANGE S'WI TCH INCONS I STENC I ES CLEANED 5'WI TCH W I TH FREON TF AND LUBRICATED WITH 'WD-40 OPENED THE TEHPERATURE CONTROL FEEDBACK LINE TO THE SUCTION OF COMPRESSOR ENTIRE SCRAH AIR HEADER SYSTEH BOUNDARIES LEAK CHECKED AND REPAIRS HADE ON WR 112111 RECENT PROBLEM WITH SCRAH AIR HEADER LOW PRESSURE ALARM LOCKING IN DURING HALF SCRAH SURVEILLANCES CAUSED BY LARGE LEAK ON SCRAH PILOT SOV 117 ON HCU 14-15 TOTAL SETUP PER VENDOR HANUAL FOLLOWED UP BY THE PHT Nl-ISP-201-Q013 REPLACED LED FOUND A NEGATIVE CURRENT LOOP ACROSS COHPUTER 4H I TO V RESISTOR INFORHATION GATHERING ONLY INSTALLED JUHPER AS PER TEHPORARY HODIFICATION 5343 AND DCR Nl-91-500LG020
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06"03"91 PAGE 3
WR Number EPN Number TITLE NINE HILE POINT UNIT ONE Electrical Haintenance - COMPLETED SAFETY RELATED WRs Description FOR HAY Corrective Action W185 535 W185 534 210.1-112 CONTROL ROOM CHILLER 112 BREAKER 210 1-111 CONTROL ROOH CHILLER 111 BREAKER REPLACE CHILLER AND OCR REPLACE CHILLER AND DCR HOLDED CASE BREAKER FOR 111 39 AHP - SEE PROBLEH REPORT 1713 Nl-90-001LS507 HOLDED CASE BREAKER FOR 112 27 AHP - SEE PROBLEH REPORT 1713 Nl-90-001LS507 REPLACED BREAKER SYMBOL 93-43-395 PER DCR Nl-90-001-LS920 WHICH SUPERCEDES DCR Nl-90-001-LS507 REPLACED BREAKER SYHBOL NUHBER 93-43-396 PER DCR Nl-90-001-LS'920 WHICH SUPERCEDES OCR Nl-90-001-L5507 W171853 W185532 210 1-122 CONTROL ROOH CHILLER 122 BREAKER 210 1-121 CONTROL ROOH CHILLER 121 BREAKER REPLACE HOLDED CASE BREAKER FOR 121 CHILLER COHPRESSOR 39 AHP -
SEE PROBLEH REPORT 1713 AND OCR Nl-90-001-LS507 REPLACE HOLDED CASE BREAKER FOR 122 CHILLER COHPRESSOR 27 AHP -
SEE PROBLEH REPORT 1713 AND DCR Nl-90 "001LS507 REPLACED HOLDED CASE BREAKER 39 AHP PER DCR Nl-90-001-LS92 WHICH SUPERCEDES DCR Nl-90-001-LS507 REPLACED HOLDED CASE BREAKER 27 AMP PER DCR Nl-90"001-,LS92 WHICH SUPERCEDES DCR Nl-90-001-LS507
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