ML17228B492

FPL St Lucie Unit 1 SG Program.

ML17228B492
Person / Time
Site:	Saint Lucie
Issue date:	04/22/1996
From:	FLORIDA POWER & LIGHT CO.
To:	NRC
Shared Package
ML17228B491	List: ML17228B492
References
PROC-960422, NUDOCS 9605170228
Download: ML17228B492 (26)

Text

ENCLOSURE 1 FLORIDA POWER&LIGHT ST.LUCIE UNIT 1 STEAM GENERATOR PROGRAM PRESENTED TO THE NUCLEAR REGULATORY COMMISSION APRIL 22, 1996'Ph05f70228 96050i~I PDR ADOCK 05000335 PDR II nrc4 96*aa

FPL PRESENTATION TO NRC-APRIL 22, 1996 ST.LUCIE UNIT 1 STEAM GENERATOR PROGRAM OPENING 8c INTRODUCTIONS I.PURPOSE OF MEETING II.STATUS OF S/G CONDITION I I I.ECT TECHNIQUE QUALIFICATION IV.5/96 REFUELING OUTAGE PLANS V.

SUMMARY

FPL PRESENTATION TO NRC-APRIL 22, 1996 ST.LUCIE UNIT 1 STEAM GENERATOR PROGRAM II;STATUS OF S/6 CONDITION S/G DESIGN FEATURES DRY STEAM~DOERS HOT SIDE RECIRCULATING FLUID FLOW QEPARATO~COLD SIDE RECIRCULATING FLUID FLOW DOWNCOMER FLOW Rl ER$V wry.rr rC ji gX rqgP DOWNCOMER FEED WATER INLEI'100%)

UNIFORM DISTRIBUTION DOWNCOMER FLOW HOT SIDE RECIRC.INLET COLD SIDE RECIRC.INLET COOLANT INLET PRIMARY COOLANT OUTLEI'2)Schematic of St.Lucie Unit 1 Steam Genetator nrc4 96.woo FPL PRESENTATlON TO NRC-APRlL 22, 1996 ST.LUCIE UNlT 1 STEAM GENERATOR PROGRAM II.STATUS OF S/6 CONDITION S/G DESIGN FEATURES~ISO)40+I Ii<O~ie Svceon Ptee,.O'.O:O.0 0 0 0 0 o o o o o 0 i 0 i 0 0 OcCea Vubo Suooon Plae.Voncai Tu&Svoen FPL PRESENTATION TO NRC-APRIL 22, 1996 ST.LUCIE UNIT 1 STEAM GENERATOR PROGRAM II.STATUS OF S/G CONDITION INSPECTION

&TUBE PLUGGING HISTORY ,::>,EXANfR I',DATE=MFG 1977 1978 1979 1981 1984 1985~B0BBIN~100%10%10%10%A-28%B-38%100%100%(8X1)~j,;".,TUBES=.y",,;PL'UGGED.".

23 21 103 507 66.~+RESuLTPSi"-COMMENT~

C)g+;>~~Qg%q~~~g~

~pg$Preservice Shop Plugs Drilled Support Rim Cut U-Bend Cracking Rows 8-11 Preventive Plugging Rows 8-11 Random Indic.-Sludge Pile 8 Supports Random Indic.-Sludge Pile&Supports Pulled 3 Tubes 1986 (Mid cycle)23 Post Outage ECT Review 8 Pltjgging 1987 1988 1990 1991 1993 1994 100%100%100%100%100%100%<50 Bobbin Indications

<50 Bobbin Indications 97 Bobbin Indications 100%HL Expan.Trans.

3%CL Expan.Trans.650 Bobbin Indications 100%HL Expan.Trans.

3%CL Expan.Trans.

250 Bobbin Indications 100%HL Expan.Trans.3%CL Expan.Trans.100 Bobbin Indications 76 239 180 449 130 94 Random Indic.-Sludge Pile&Supports Random Indic.-Sludge Pile 8 Supports Random Indic.-Sludge Pile&Supports 98 Circ.Indications

-HL Expan.Trans.Random Indic.-Sludge Pile&Supports 12 Circ.Indications

-HL Expan.Trans.Random Indic.-Sludge Pile&Supports 14 Circ.Indications

-HL Expan.Trans.TOTAL TUBES-Each=8519 TOTAL PLUGS-S/G A=1138 (13.3%)S/G B=774 (9.1%)PLUG MARGIN-2129 Tubes (25%)each S/G+/-7%Asymmetry nrc4 96.wca r'~>>ax%N fH~~RIIIKIIIEllll j%P<ERMHIllllllllBMIH NTEEllllllllllIIEIlllllll&

FPL PRESENTATION TO NRC-APRIL 22, 1996 ST.LUCIE UNIT 1 STEAM GENERATOR PROGRAM II.STATUS OF S/6 CONDITION 1985 TUBE PULL RESULTS Correlation of ECT and Metallography Results ST.LUCIE UNIT 1-'S/G"A" PULLED TUBE CORRELATION BOBBIN COIL EDDY CURRENT vs METALLOGRAPHY LINE ROW ELEV.ECT%1985 MET.DEPTH ECT%1996 DEFECT APPEARANCE 120 120 79 79 59 59 12 12 91 91 95 95 Sludge Pile¹3 EC-Hot Sludge Pile Sludge Pile¹2 EC-Hot¹1 EC-Hot 41'1 82%UDS 57%29%DSS 30%72%16%42%13%52%26%70%NDD 44 3%46%IG/TG SCC parallel axial cracks.0.4" longest over 1" axial length across 360'f tube circumference.

Most over 90'.IGNTG SCC parallel axial cracks in land area 0.6'ongest over 2'xial across 0.1'f tube circumference.

IGA Patch.5'xial x.5'irc.IGA Patch.8'xial x.5'irc.IGA Patch.4'xial x.3'irc.IGA Patch.7'xial x.3'irc.EC Eggcrate UDS Undefined signal DSS Distorted Signal NDD No Detectable Defect nrc4~6*c i FPL PRESENTATION TO NRC-APRlL 22, 1996 ST.LUCIE UNIT 1 STEAM GENERATOR PROGRAM II.STATUS OF S/6 CONDITION LOCATION OF DEGRADATION REPORTABLE INDICATIONS IN SERVICE S/G REGION S/G A S/G S'.Vl V2 V3 U-BEND DRILLED SUPPORTS¹9&10 EGGCRATE SUPPORTS¹1TOS 190 166 294 101 1948 1242 18H 87H 86H EIW2 18C 89C 88C 87C SLUDGE PILE 1131 642 33H 82H 83C 82C O'C~SC TOTALS 3563 2151 INLET OLITLET nrc4 96.wpa FPL PRESENTATION TO NRC-APRIL 22, 1996 ST.LUCIE UNIT 1 STEAM GENERATOR PROGRAM II.STATUS OF S/6 CONDITION LEAKAGE HISTORY April 1981 Leak Rate-0.01-0.05 Gallons/Day (gpd)Leak Location-Steam Blanketed U-Bend Cause IGA/IGSCC January 1990 Leak Rate-2-5 Gallons/Day (gpd)Leak Location--13" Above Tubesheet Cause Slag Nugget Between Periphery.

nrc4 96.wpd

.FPL PRESENTATION TO NRC-APRIL 22, 1996 ST.LUCIE UNIT 1 STEAM GENERATOR PROGRAM II.STATUS OF S/G CONDITION LEAKAGE HISTORY TECHNICAL SPECIFICATION REQUIREMENTS 3 Samples/7 Days-5 ml Gross Activity Monthly Sample-4000 ml Dose Equivalent Iodine ADDITIONAL MONITORING On-Line Blowdown Monitors Air Ejector Monitors Grab Samples 400 Liter Sample on Resin Monthly if<LLD Weekly if>LLD Secondary Side Tritium Current RCS Leakage 3-5 Gallons/Day (gpd)EPRI Leak Rate Guidelines Night Order in Control Room Incorporate into Operations Procedures Prior to Startup from 4/96 Outage nrc4 96.woa FPL PRESENTATION TO NRC-APRIL 22, 1996 ST.LUCIE UNIT 1 STEAM GENERATOR PROGRAM III.ECT TECHNIQUE QUALIFICATION

-IGA/SCC FPL BOBBIN COIL TECHNIQUE EXCEEDS EPRI S/G EXAM.GUIDELINE,"APPENDIX H" REQUIREMENTS

~Ri t tt di H R FPL Techni ue DETECTION 80%POD90%CL For Flaws>60%80%POD90%CL'or Flaws>35%DEPTH SIZING RMSE<25%RMSE=17.9%***EPRI PEER REVIEW APPROVED MARCH 27, 1996***QUALIFICATION SAMPLE SET FLAWS AT EGGCRATE SUPPORTS FLAWS AT SLUDGE PILE REGION ALL AVAILABLE CE S/G PULLED TUBE DATA 11 FLAWS FROM CE S/Gs (6 from PSL-1)7 IGA/SCC LAB SAMPLES FROM EPRI nrc4 96*cc FPL PRESENTATION TO NRC-APRIL 22, 1996 ST.LUCIE UNIT 1 STEAM GENERATOR PROGRAM 1ll.ECT TECHNIQUE QUAL1FlCATION

-IGA/SCC FPL BOBBIN COll QUALIFICATION SAMPLE SET ECT vs METALLOGRAPHY RESULTS DETECTION 80 to POD90%CL For Flaws>35%DEPTH SIZING RMSE=17.9%BOBBIN COIL APL H ODSCC'gqW"'-8)'(~NgP~z q~(<<$'g (~qq()%@(""", Mean=-5.551 Std Oev i 17.54,'""'", 0 I P.~1e':-:,:-~y!

70 H 00 3 50 4.W O IYI g'"'"'-"'""""""-'"TW DETECTED POD e 9014 CL<<M%3OF5<<.00 IS OF 13.EO y400~Ect%10 0 10 20 30 40 MAX MET DEPTH 70 80 nrc4 96*m FPL PRESENTATION TO NRC-APRIL 22,'f996 ST.LUCIE UNIT 1 STEAM GENERATOR PROGRAM III.ECT TECHNIQUE QUALIFICATION DRILLED SUPPORT ECT-SIGNAL LARGER 5 INTERFERES MORE WITH FLAW DETECTION Bc SIZING 0.41 vlS N>>l 1 mI IS I 0 0 0 0'0:0:0:.'0:0:0:0'0&>>II Ilail>>.ll>>>>Ill Ill'qua.IH>>W VOW CI>>I SS~.SS Mll~SS 4'SS DRILLED SUPPORT DESIGN ECT SIGNAL ll>>N IIII 0,41 vte lorn 1 rol III I':-rP QQ V%I IN I.SS mll~II tel Ill EGGCRATE SUPPORT DESIGN ECT SIGNAL C

FPL PRESENTATION TO NRC-APRIL 22, 1996 ST.LUCIE UNIT 1 STEAM GENERATOR PROGRAM III.ECT TECHNIQUE QUALIFICATION FLAW AT DRILLED SUPPORT PLATE (FLAW IDENTIFIED BY VECTOR POINTS)ls+00 Ol'rr O.ovo 5~alo Sl loo Olfr 1.5vo S 22 Ilk'ill 5 Ofrf O.dvO 5 r an 100 dOSl.J.ovo 5 Sl an VOO Q V Oa leO 2.2%v~ld 005 VOO%W ann la Vdd~W aa lOO 2.$0 20d 50%2.00'ld 005 O.52 VOO+Va ta l00!0.0te ll1d FLAW AT EGGCRATE SUPPORT (FLAW IDENTIFIED BY VECTOR POINTS)tr 400 Olla'Ovo 5~alt loc olrf I.JVO 5 ll dl&dlrl 5 Dlrr l.ovo 5~aro 2.~5 25 a52 vdd g v~aa leo vdd a vai e loo vod g v I e larva g~o w le 2.5lv lloyd 30l 3.%%<lCdd 2.%le%kl tA 2.~203e 01H 0.70 nrc4 96.wpa

~~FPL PRESENTATION TO NRC-APRIL 22, 1996 ST.LUCIE UNIT 1 STEAM GENERATOR PROGRAM III.ECT TECHNIQUE QUALIFICATION

-IGA/SCC EPRI BOBBIN COIL QUALIFICATION FOR IGA/SCC ALL DRILLED SUPPORT PLATE PULLED TUBE FLAWS e t DETECTION e'xHR 80%POD I 90%CL For Flaws~60%EP I Tec 80%POD90%CL For Flaws 40 DEPTH SIZING RMSE s 25%RMSE=29~o EPRI EFFORT NOT REPRESENTATIVE FOR CE S/Gs ST.LUCIE UNIT 1 HAS 2 PARTIAL DIAMETER DRILLED SUPPORTS nrc4 96.wpa 4 I FPL PRESENTATION TO NRC-APRIL 22,'I996 ST.LUCIE UNIT 1 STEAM GENERATOR PROGRAM IV.1996 S/6 INSPECT(ON PLANS DRILLED SUPPORT PLATES f ENHANCED APPROACH FOR EOC 13 INSPECTION EPRI S/G Examination Guidelines, Supplement I-"Guidelines for Disposition of Bobbin Coil Indications Attributed to ODSCC at Non-Dented and Drilled Tube Support Plates" SUPPLEMENT I APPROACH BOBBIN SIZING IF INDICATION IS CONCLUSIVE MRPC IF INDICATION IS INCONCLUSIVE REPAIR FOR CRACK LIKE INDICATION MONITOR IF NOT CRACK LIKE FPL APPROACH-MRPC ALL BOBBIN INDICATIONS PLUG CRACK-LIKE INDICATIONS TRACK IF NOT DETECTED BY MRPC EVALUATE IF NOT CRACK-LIKE BY MRPC ASSESS DEPTH BY BOBBIN E.MRPC REVIEW HISTORY FOR GROWTH PLUG IF 4P%)OR EVIDENCE OF GROWTH nrc4 96 woa FPL PRESENTATION TO NRC-APRIL 22, 1996 ST.LUCIE UNIT 1 STEAM GENERATOR PROGRAM IV.1996 S/G INSPECTION PLANS BOBBIN COIL INSP ECTIONS<00%OF ACTIVE TUBES FULL LENGTH MRPC COIL INSPECTIONS 100%OF ACTIVE HL EXPANSION TRANSITIONS 20%OF ACTIVE CL'EXPANSION TRANSITIONS 20%OF HL DENTED SUPPORT INTERSECTIONS SELECTED BOBBIN INDICATIONS (DIAGNOSTIC)

I~~FPL PRESENTATION TO NRC-APRIL 22, 1996 ST.LUCIE UNIT 1 STEAM GENERATOR PROGRAM IV.1996 S/6 INSPECTION PLANS IN-SITU PRESSURE TEST SEVERAL SIGNIFICANT FLAWS AXIAL 5 CIRCUMFERENTIAL INSTALLED PLUG INSPECTIONS LOCATION E.CONDITION WESTINGHOUSE ALLOY 600 PLUGS FRAMATOME"PAP" ALL HOT LEG PLUGS nrc4 96.wpa

FPL PRESENTATION TO NRC-APRIL 22, 1996 ST.LUCIE UNIT I STEAM GENERATOR PROGRAM V.

SUMMARY

CONSERVATIVE PROGRAM HISTORY PROACTIVE RESPONSE TO LEAKAGE PREVENTIVE PLUGGING PROACTIVE INSPECTIONS NO MID-CYCLE OUTAGES SINCE 1986 BOBBIN TECHNIQUE EXCEEDS APPENDIX H CONSERVATIVE APPROACH ON DRiL'D PLATES REPLACEMENT SCHEDULED FOR SPRING 1998 nrc4 96.wpa FPL PRESENTATION TO NRC-APRIL 22, 1996 ST.LUCIE UNIT 1 STEAM GENERATOR PROGRAM V.

SUMMARY

REPLACEMENT S/G FEATURES SAME FORM, FIT&FUNCTION 50.59 SAFETY EVALUATION ALLOY 690 TUBING ALL LATTICE BAR SUPPORTS-410 SS FLAT BAR VERTICAL SUPPORTS BLOWDOWN HEADER INTEGRAL WITH TUBESHEET I nrc4 96.wpd ENCLOSURE 2 MEETING BETWEEN NRC STAFF AND FLORIDA POWER 5.LIGHT COMPANY ST.LUCIE, UNIT 1 APRIL 22, 1996 Name Office W.Bohlke G.Boyers K.Craig E.Weinkam M.Schoppman L.Wiens R.Croteau P.Rush J.Norris B.Sheron F.Hebdon J.Strosnider E.Sullivan G.Hornseth K.Karwoski J.Tsao FPL FPL FPL FPL FPL NRC NRR/PDII-2 NRR/EMCB NRR/PDI I-I NRR/DE NRR/PD I I-3 NRR/DE/EMCB NRR/DE/EMCB NRR/DE/EMCB NRR/DE/EMCB NRR/DE/EMCB I lg