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

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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 II 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 QEPARATO~ COLD SIDE RECIRCULATING RECIRCULATING FLUID FLOW FLUID FLOW DOWNCOMER FEED WATER Rl ER INLEI'100%)

UNIFORM DISTRIBUTION DOWNCOMER DOWNCOMER FLOW FLOW

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rr rC ji gX rqgP HOT SIDE COLD SIDE RECIRC. INLET RECIRC. INLET PRIMARY COOLANT COOLANT INLET OUTLEI'2) nrc4 96.woo Schematic of St. Lucie Unit 1 Steam Genetator

FPL PRESENTATlON TO NRC - APRlL 22, 1996 ST. LUCIE UNlT 1 STEAM GENERATOR PROGRAM II. STATUS OF S/6 CONDITION S/G DESIGN FEATURES

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FPL PRESENTATION TO NRC - APRIL 22, 1996 ST. LUCIE UNIT 1 STEAM GENERATOR PROGRAM II. STATUS OF S/G CONDITION INSPECTION & TUBE PLUGGING HISTORY

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MFG 100% 23 Preservice Shop Plugs 1977 10%

1978 10%

1979 10% 21 Drilled Support Rim Cut 1981 A- 28% 103 U-Bend Cracking Rows 8-11 B -38%

1984 100% 507 Preventive Plugging Rows 8-11 Random Indic. - Sludge Pile 8 Supports 1985 100% (8X1) 66 Random Indic. - Sludge Pile & Supports Pulled 3 Tubes 1986 (Midcycle) 23 Post Outage ECT Review 8 Pltjgging 1987 100% <50 Bobbin Indications 76 Random Indic. - Sludge Pile & Supports 1988 100% <50 Bobbin Indications 239 Random Indic. - Sludge Pile 8 Supports 1990 100% 97 Bobbin Indications 180 Random Indic. - Sludge Pile & Supports 1991 100% 100% HL Expan.Trans. 449 3% CL Expan. Trans. 98 Circ. Indications - HL Expan. Trans.

650 Bobbin Indications 1993 100% 100% HL Expan.Trans. 130 Random Indic. - Sludge Pile & Supports 3% CL Expan.Trans.

250 Bobbin Indications 12 Circ. Indications - HL Expan. Trans.

1994 100% 100% HL Expan. Trans. 94 Random Indic. - Sludge Pile & Supports 3% CL Expan. Trans. 14 Circ. Indications - HL Expan. Trans.

100 Bobbin Indications TOTAL TUBES - Each = 8519 PLUG MARGIN - 2129 Tubes (25%) each S/G TOTAL PLUGS - S/G A = 1138 (13.3%) +/- 7% Asymmetry S/G B = 774 ( 9.1%)

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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 % MET. ECT % DEFECT 1985 DEPTH 1996 APPEARANCE 120 12 Sludge Pile 41'1 30% 26% IG/TG SCC parallel axial cracks.

0.4" longest over 1" axial length across 360'f tube circumference.

Most over 90'.

120 12 ¹3 EC-Hot 82% 72% 70% IGNTG SCC parallel axial cracks in land area 0.6'ongest over across 0.1'f tube 2'xial circumference.

79 91 Sludge Pile UDS 16% NDD IGA Patch .5'xial x.5'irc.

79 91 Sludge Pile 57% 42% 44 IGA Patch .8'xial x.5'irc.

59 95 ¹2 EC-Hot 29% 13% 3% IGA Patch .4'xial x.3'irc.

59 95 ¹1 EC-Hot DSS 52% 46% 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 190 166 EIW2 18H 18C DRILLED SUPPORTS

¹9 &10 294 101 89C 88C 87H 87C 86H EGGCRATE SUPPORTS

¹1TOS 1948 1242 33H 83C 82H 82C SLUDGE O'C PILE 1131 642

~ SC TOTALS INLET OLITLET 3563 2151 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.

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. 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 ADDITIONALMONITORING 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% POD 90% CL 80% POD 90% CL For Flaws > 60% 'or Flaws > 35%

DEPTH SIZING RMSE < 25% RMSE = 17.9%

• *

• EPRI PEER REVIEW APPROVED MARCH 27, 1996 ***

QUALIFICATIONSAMPLE SET FLAWS AT EGGCRATE SUPPORTS FLAWS AT SLUDGE PILE REGION ALL AVAILABLECE 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 QUALIFICATIONSAMPLE SET ECT vs METALLOGRAPHY RESULTS DETECTION 80 to POD 90% CL For Flaws >35%

DEPTH SIZING RMSE = 17.9%

BOBBIN COIL APL H ODSCC

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POD e 9014 CL 70 <<M% 3OF5 <<.00 IS OF 13 .EO H

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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

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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 1.5vo Olfr S 22 Ilk'ill O.dvO 5 5 Ofrf r an 100 dOSl.

J.ovo 5 Sl an VOO Q V Oa leO VOO  % W ann la Vdd ~ W aa lOO VOO + Va ta l00 2.2%v ~ ld 005 2.$ 0 20d 50% 2.00'ld 005 !0.0te ll1d O. 52 FLAW AT EGGCRATE SUPPORT (FLAW IDENTIFIED BY VECTOR POINTS) tr 400 Olla' loc olrf dlrl 5 Dlrr Ovo 5 ~ alt I.JVO 5 ll dl& 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

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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 e 'xHR EP I Tec DETECTION 80% POD For Flaws I ~

90% CL 60%

80% POD 90% 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

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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)

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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 AXIAL5 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

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ENCLOSURE 2 MEETING BETWEEN NRC STAFF AND FLORIDA POWER 5. LIGHT COMPANY ST. LUCIE, UNIT 1 APRIL 22, 1996 Name Office W. Bohlke FPL G. Boyers FPL K. Craig FPL E. Weinkam FPL M. Schoppman FPL L. Wiens NRC R. Croteau NRR/PDII-2 P. Rush NRR/EMCB J. Norris NRR/PDI I-I B. Sheron NRR/DE F. Hebdon NRR/PD I I-3 J. Strosnider NRR/DE/EMCB E. Sullivan NRR/DE/EMCB G. Hornseth NRR/DE/EMCB K. Karwoski NRR/DE/EMCB J. Tsao NRR/DE/EMCB

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