ML17213B314: Difference between revisions

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| issue date = 04/27/1983
| issue date = 04/27/1983
| title = Summarizes 830425 Meeting W/Nrc Re Reactor Vessel Internals & Thermal Shield Plant Recovery Program Concerning Pressurized Thermal Shock.Plant May Safely Operate W/O Restriction from Pressurized Thermal Shock Considerations
| title = Summarizes 830425 Meeting W/Nrc Re Reactor Vessel Internals & Thermal Shield Plant Recovery Program Concerning Pressurized Thermal Shock.Plant May Safely Operate W/O Restriction from Pressurized Thermal Shock Considerations
| author name = UHRIG R E
| author name = Uhrig R
| author affiliation = FLORIDA POWER & LIGHT CO.
| author affiliation = FLORIDA POWER & LIGHT CO.
| addressee name = CLARK R A
| addressee name = Clark R
| addressee affiliation = NRC OFFICE OF NUCLEAR REACTOR REGULATION (NRR)
| addressee affiliation = NRC OFFICE OF NUCLEAR REACTOR REGULATION (NRR)
| docket = 05000335
| docket = 05000335

Revision as of 09:34, 19 June 2019

Summarizes 830425 Meeting W/Nrc Re Reactor Vessel Internals & Thermal Shield Plant Recovery Program Concerning Pressurized Thermal Shock.Plant May Safely Operate W/O Restriction from Pressurized Thermal Shock Considerations
ML17213B314
Person / Time
Site: Saint Lucie NextEra Energy icon.png
Issue date: 04/27/1983
From: Robert E. Uhrig
FLORIDA POWER & LIGHT CO.
To: Clark R
Office of Nuclear Reactor Regulation
References
REF-GTECI-A-49, REF-GTECI-RV, TASK-A-49, TASK-OR L-83-263, NUDOCS 8305020345
Download: ML17213B314 (23)


Text

REGULA~Y INFORMATION DI STRIBUTIO YSTEM=('R IDS)ACCESSION NBR:8305020345 DOC~DATE: 83/04/27 NOTARIZED; NO FACIL:50-335 St, Lucie Planti Unitt ii Florida Power 8, Light Co<AUTH, NAME AUTHOR AFFILIATION i UHRIG'RNE~Florida Power 8 Light Co~REC IP, NAME RECIPIENT AFFILIATION CLARKiR~AD~'perating Reactors Branch 3

SUBJECT:

Summarizes 830425 meeting w/NRC re,reactor vessel internals 8 thermal shield plant recovery program concerning pressurized thermal shock.'Plant may safely operate,w/o.restriction from pressurized thermal shock considerations.

DISTRIBUTION CODE: AOAOS COPIES RECEIVED:LTR

-ENCL l SIEE: TITLE: OR Submittal:

Thermal'Shock to Reactor Yessel NOTES'OCKET 05000335 REC IP IENT ID CODE/NAME NRR ORB3 BC 01 INTERNAL: ELD/HDS2 12 NRR DIR NRR/DE/MTEB NRR/DL DIR NRR/DSI DIR N DIR RE4 FIL A COPIES LTTR ENCL 7 7 1 0 1 1 1 1 1 1 1 1 1 1 1 1 1 1 RECIPIENT ID CODE/NAME MURLEYgT NRR V I SS ING i G04 NRR/DHFS D IR NRR/DL/ORAB 11 NRR/DSI/RSB NRR/DST/GIB RES/DET RGN2 COPIES LTTR ENCL 1 1 1 1 1 1 1 0 1 1 1 1 1 1 1 1 EXTERNAL: ACRS NRC PDR NTIS 10 02 6 6 1 1 1 1 LPDR NSIC 03 06 1 1 1 1 tTOTAL NUMBER OF COPIES REQUIRED: LTTR 33 ENCL'31 IF (I W~e li<<J'Wf, W I I'I(WFW I I,W W'f Fi)1"L iAIIF i'ff f'W'W'3 fI'(.,~(, Wr II(,q,>I,, r,~WWa.i I g W I ('I I(W"(.><<7,, l W I if WF>1(I>Il~I!h Iff>>hf W(I>4 I!i 1(i (i'll if'1>If Ig((f(I~,'>>

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~~P.O.Box 14000, JUNO BEACH, FL 33408 FLORIDA POWER&LIGHT COMPANY April 27, I 983 L-83-263 Office of Nuclear Reactor Regulation Attention:

Mr.Robert A.Clark, Chief Operating Reactors Branch$/3 Division of Licensing U.S.Nuclear Regulatory Commission Washington, D.C.20555

Dear Mr.Clark:

Re: St.Lucie Unit I Docket No.50-335 Reactor Vessel Internals and Thermal Shield;Plant Recover Pro ram In a meeting on April 25, 1983, Florida Power and Light Company provided you with information about the St.Lucie Unit I reactor vessel with respect to pressurized thermal shock (PTS).This letter sum'marizes that meeting and satisfies item D(l)of our letter of April I 9, I 983 (L-83-230).

CEN-I89, Appendix F (" Evaluation of PTS Effects due to Small Break LOCA's with Loss of Feedwater for the St.Lucie I 8 2 Reactor Vessels" December, l98I), provided an evaluation of the St.Lucie I reactor vessel for PTS effects of certain specific hypothetical plant transients (post TMI 2 Action).The governing axial weld is located in the lower shell course at an azimuthal location where the fluence profile is 47%of the peak fluence.Using the material and fluence data developed in CEN-I89, Appendix F, the residual chemistry for this weld is 0.30 wt.%Cu and.64 wt.%Ni.The resultant end-of-life RTNDT for this weld is predicted to be 2I7OF using the shift prediction method of SECY-82-465

("NRC Staff Evaluation of PTS", November 23, I 982).For the sake of comparison only, even if St.Lucie I operated from beginning-of-life to end-of-life without a thermal shield, the end-of-life RTNDT predicted by the method of SECY-82-465 would still only be 252OF.Since St.Lucie I has operated until now with a thermal shield, the end-of-life RTNDT would be somewhat less than this upper bound value.We understand the NRC staff and their consultants are developing a revision to the RTNDT shift prediction method of SECY-82-465 which would result in a lower EOL RTNDT prediction.

830502034~

0335 gg 830427 PDR ADOCY 0@DR P PEOPLE.E...

SERVING PEOPLE

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~~Page 2 Office of Nuclear Reactor Regulation Mr.Robert A.Clark, Chief These evaluations will be updated as the results of the surveillance capsule program become available.

Also, the vessel beltline weld in-service inspections being completed this outage will provide additional confirmation of the soundness of the vessel material.Based on these evaluations, St.Lucie I may safely operate without restriction from PTS considerations.

Very truly yours, Robert E.Uhrig Vice President Advanced Systems&Technology REU jDAC/cab cc: Harold F.Reis, Esquire Enclosure

~~

ST, LUCIE-'1 PTS MEETING AGENDA APRIL 25, 1983 1,.REVIEW PRESENT PTS.STATUS 2.EFFECTS OF THERMAL SHIELD REMOVAL ON PTS 3, ONGOING PTS EFFORT E4, SCHEDULES ST, LUCIE-j.PRESENT PTS STATUS l..MELD CHENI.STRY

.2, FLUENCE CALCULATIONS 3, RT-NDT PREDICTIONS

FIGURE F6-1 ST.LUCIE El REACTOR PRESSURE VESSEL HAP INITIAL RTNPT IN'F 20 4J~X Z eo~I C~6~3 E3D I 203@@C.6-2 Egg";.C 6 II%03 UJ IOO C3 C~7-I QD 2 2o3CZ5 C-V.2 Qfj C V~3C~~Q a Iio 4J (Z I 100 a~2 C 8 3CEI 3 2o3E9 CORE C 8~I C++3 C~8-2~220 eo..0 IeO Al I tlUTIIAL LOCA I I otl, OCGREE5 TABLE F6-1 ST.LUCIE UNIT Nl REACTOR VESSL'L HATERIALS Product Form Via ter i a 1 Identi f i cation Orop Weight~NDTT'F Initial RTND~T'F Nic el Phos horus ChemicaI Content~i)

Plate Plate Plate Plate Plate Plate Plate Plate Plate Wel d Wel d Wel d r Meld f C6-1 C6-2 C6-3 C7-1 C7-2 C7-3 CS-1 CS-2 CB-3 1-203 A,B,8C 3-~03 A,B,tlC 9-203 10-30-10 0-30-30.-10 0 0 N/A N/A N/A N/A N/A 10-30-10 Oa 0 a 10 20 0 a'c-50-50'-50-60-60.53.53.53.64.64.58.56.57.SSd.11 b.14b.14b.14 ,11.11.11.15.15.12.~22~l.21.23'.012.011.011.004.004.004.006.006.004.015.018.013.016.013 N/A a b c d e Not Available Oetermined using Branch Technical Position HTEB 5-2 E'stimated based on average of similar plates Estimated{see Table F6-2)Estimated Ni content{high nickel type wire)Estimated Ni content low nickel type wire) a ST.LUCIE-1 CURRENT FLUENCE CALCULATIONS (REF, CEN-j.89)NS-2.R5 DOT PROFILE CNS-2 POMER DIST.)~VIS-2 CAPSULE BENCHNARK SL-1 POINT KERNEL PEAK (SL-j.POWER DIST.)

I.b HORIIAL)ZED FAST FLUX ST.LUCIEI AZIMUTHAL FLUENCE VARIATION AI VESK Ojio INTSFAK b.7 8.6, b.k Jh 15%TA IKNEES FIGURE F5-3 FIGURE F6-2 ST.LUCIE fl REACTOR PRESSURE VESSEL NP ADJUSTEO RTNDT IN'F (12/31/81) 3.55 Effect)ve Ful 1 Power Years 0.33 x 1019n/cm2 Peak Surface Fluence 20 th~W X Z 60 4P uj IOO C)K C3 Iio 4~I I.203-2 203-C~6~3 i C~7~I I 203-2 203-C.6.2 C-7~2 C~6.I.T C~7~3 4J (3 CZ I tQ Cl I 80~2 3 203>C~8,3 C~W 3203'C B.I C~8~2 220 260-ISO 360 Rl I tIUIIIRL LOCA I 10:7, OEGREES

~~ST, LUCIE-1 CURRENT STATUS I EOL PEAK FLUENCE=2..83 x 10 x/cz'Ol NEv)EOL HELD FLUENCE=A7..5X x PEAK 1,,305 x j019 v/c~2 EOL HELD RTNDT=2 17,.7 F k~~ST, LUCIE-j.EFFECTS OF THERMAL'SHIELD REMOVAL ON PTS 1).EOL FI UENCE 2)EOL RT-NDT' ST.LUCIE-1"(32.EFPY M/0 T,S.)THERMAL SHIELD WORTH~1.75 x FLUENCE EQL PEAK FLUENCE=.+Q,95 x 10 N/CN EOL WELD FLUENCE-+2.35 x 10 w/cm I EOL WELD RTNDT>252,7 F (CONSERVATIVE UPPER BOUND)

ST, LUCI E-1 ONSOINj PTS EFFORT l)SURVEILLENCE CAPSULE EVALUATION 2)UPDATED FLUENCE CALCULATIONS 5)1OOX BELTLINE HELD ISI gg0 I I 180 I~OUHet Nozzle///I I Core Shroud-Core Suppor't Barrel lf.F..t Reactor Vessel I f Thermal Shield~inlet iNozzle-263 Core.tNidpfane Vs'essel Capsule Ass embl)g 4 Thermal Shield Reactor Vessel Core Support Barrel p~,d nlan Vit FIGURE F5-4 Elevation View ST, LUCIE-1 UPDATED FLUENCE CALCULATIONS SL-1 9'DOT (SL-1 POWER DIST, CY 1-5)SL-1 Hk DOT (SL-1 CY6 POWER DIST.)SL-1 SURVEILLENCE CAPSULE BENCH1ARK

~~r l