ML20126F993
| ML20126F993 | |
| Person / Time | |
|---|---|
| Site: | Millstone  |
| Issue date: | 03/16/1981 |
| From: | James Shea Office of Nuclear Reactor Regulation |
| To: | Office of Nuclear Reactor Regulation |
| References | |
| NUDOCS 8103240850 | |
| Download: ML20126F993 (80) | |
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i MAR 161981- , LICENSEE: Northeast Nuclear Energy Company f FACILITY: Millstone 1 6
SUBJECT:
MEETING SUM MRY OF MARCH 6. 1981 ..w. l i Northeast Nuclear Energy Company (NNECO) and NRC representatives met in : the Bethesda, Maryland office of General Electric Company (GE)(Landow Building - 7910 Woodmont Avenue) on March 6,1981. The purpose of the ; meeting, requested by NNECO, was to brief the.NBC representatives on pipe cracking at Millstone IJnit 1. GE recently found that some of the i pipe weld cracks detected during the October 1980-April 1981 Millstone , extended refueling outage In-Service Inspection (ISI) of stainless steel pipe were transgranular, although u>st were intergranular. At NRC's request NNECO sumar17ed the analytical results and the modifications. to the. Isolation Condenser Steam supply and condensate return pipe . supports and anchor bolts to assure the NRC required safety factor of
- 4. Also at NRC request NNECO described the extent of stainless steel ;
pipe replacement during the current outage. ; i All attendees (see enclosed list) were provided a copy of the visual aids used during the NNECO presentation. (One copy attached for docket room. Interested individuals may obtain copies by contacting the undersigned.) The NNECO sunmary and conclusions, however, are , restated below: Sumary o Inspections exceeded NUREG 0313 [ o All cracked material replaced with NUREG 0313 material ; ( l l e NUREG 0313 leak-before-break conclusion remains valid , e Leakage detection syste;ns operational j e NUREG 0313 ISI to continue Conclusions e Pipe cracking remains non-safety problem as previously concluded , in NUREG 0313 4 e Continued safe plant operation is assured .,, THIS DOCUMENI CONTAIM 81082A0 "
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h k b- W di Y M N 2-The NNECO epresentatives exhasized that beed on tests and analysis of Millntone 1 of the cracked stainless steel pipe during the 1980-1981 extended outage, the cracks are not indicative of a generic concern, . but rather unique to Millstone 1. The licenses traced the origin of the cracks to the 1972 chloride intrusion incident. All of the observed cracks were in the weld material or the weld heat affected zone. The 304 stainless steel piping was reroved and was replaced with low carbon 316K stainless steel pipe. Current plans schedule Millstone 1 to return to power generation on April 2,1981. Original Signed by J. J. Shea,/r"cdect Manager Operating Reactors Branch f5 Division of Licensing
Enclosures:
- 1. List of Attendees
- 2. Visual aids l
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NAR 161981 cc w/ enclosures: William H. Cuddy, Esquire Connecticut Energy Agency Day, Berry & Howard ATTN: Assistant Director Counselors at Law Research and Policy One Constitution Plaza Development . Hartford, Connecticut 06103 Department of Planning and Energy Policy Natural Resources Defense Council 20 Grand Street 91715th Street, N. W. Hartford, Connecticut 06106 Washington .D. C. 20005 Director, Criteria and Standards Division Northeast Nuclear Energy Company Office of Radiation Prograns ATTN: Superintendent (ANR-460) Millstone Plant U. S. Environmental Protection P. O. Box 128 Agency Waterford, Connecticut 06385 Weshington, D. C. 20460 Mr. Jaces R. Himmelwright U. S. Environmental Protection Northeast Utilities Service Company Agency P. O. Box 270 Region I Office Hartford, Connecticut 06101 ATTN: EIS C00RDihATOR JFK Federal Building Resident Inspector Boston, Massachusetts 02203 c/o U. S. NRC P. O. Box Drawer KK Mr. W. G. Counsil, Senior Vice President Niantic, Connecticut 06357 Nuclear Engineering and Operations Northeast Nuclear Energy Company Waterford Public Library Post Office Box 270 Rope Ferry Road, Route 156 Hartford, Connecticut 06101 Waterford, Connecticut 06385 First Selectman of the Town of Waterford Hall of Records 200 Boston Post Road Waterford, Connecticut 06385 John F. 0peka Systens Superintendent Northeast Utilities Service Cocpany P. O. Box 270 Hartford, Connecticut 0610i i i l l
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. . <. i LIST OF ATTENDEES,
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March 6[1981 J s I Name Telephone Number Affiliation James J. Shea (301) 492-7231 NRC 7 William H. Koo 492-8033^ NRC i Horace X. Shaw -492-7364 NRC William J. Collins 492-8180 NRC , J.R. Fair 492-4746 NRC C.Y. Cheng 492-8033 K. Ho Cotter (314) 361-6200 Fracture Proof" Design Corp;, St. Louis Keith Wichman 492-7389 . NRC Gary D. Aikire 666-6911 (3548) NUSCO Paul A. 81asioli 666-6911 (3684) NUSCO Eric DeBarba 666-6911 (5815) 1 NUSCO-Joe Lemaire (408) 925-6656 GE dar Mehta- (408)925-5029 GE Jim Kilty (408) 925-1260 GE Eph Romesberg (408) 925-3360- GE R.A. Hermann 492-8414 NRC-Pei-Ying Chen 492-9601 NRC L 9 i f f
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MILLST0iiE UNIT NO 1 I NRC MEETIflG AGENDA STAlilLESS STEEL PIPE CRACKIf1G , I. INTRODUCTION (NUSCO) A. DISCUSSION OF CURRENT GUTAGE B. INSERVICE INSPECTION C. EXTENT OF CRACKING D. DISCUSSION OF REPAIR E. DESCRIPTION OF ISOLATION CONDENSER SYSTEM II. METALLURGICAL IllVESTIGATION (GE) III. SUilNARY OF 1972 CHLORIDE INTRUSION IflCIDENT (GE) IV. SYSTEMS EVALUATI0tl A. DUCTILE FAILURE MARGIN (GE) B. TEARING INSTABILITY IIARGIN (FPDC) C. NUREG 0313 (NUSCO) D. ISE BULLETINS 79-02 & 79-14 (fiUSCO) . V. SUMf1ARY AND CONCLUSIONS (NUSCO) e
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MILLSTONE UNIT NO. 1 ,. 1980/1981 REFUEL DUTAGE MAJOR TASKS o FEEDWATER SPARGER/ CLAD REMOVAL 0 CORE SPRAY PIPE REPLACEMENT e TORUS MODIFICATIONS e FEEDWATER CHECK VALVE REPLACEMEt!T o ISE BULLETIN 79-02/79-14 o ISE BULLETIN 80-11 o ENVIRONMENTAL ENCLOSURES o 10-YEAR INSERVICE INSPECTION PIPE CRACK MILESTONES o OCTOBER 3, 1980: UNIT SHUTDOWN O N0vsMBER 6, 1980: FIRST ISO-CONDENSER CRACKS DISCOVERED e NOVEMBER 20, 1980: LER-RO-80-19/IT SUBMITTED e FEBRUARY 9, 1981: LER-R0-80-19/IT UPDATES SUBMITTED e FEBRUARY 20, 1981: INSPECTIONS COMPLETED e FEBRUARY 23, 1981: LER-R0-81-01/IT SUBMITTED e APRIL 2, 1981: UNIT ON-LINE
MILLSTONE UtilT f!0.1 .. 1980/1981 li1 SERVICE lilSPECTI0fi STAINLESS STEEL PIPE TECHNIQUES PRIMARY: 0 ULTRASONICS - 1/4 X 1/4 AND 3/8 x 3/8 DUAL ELEMENT FOCUSED PROBES; 1.5 MHz; 450 SHEAR WAVE SUPPORTING: o ULTRASONICS - 8 X 9 MM SINGLE ELEMENT POTTED 4 MHZ NARROW BAND; 450 SHEAR WAVE o RADIOGRAPHY o Llou!D PENETRANT (WHERE ID ACCESSIBLE) EXTENT e ISO-CONDENSER SUPPLY -- 100% e ISO-CONDENSER RETURN -- 100% e SMUTDOWN C00LIN:3/ CLEANUP -- 12 WELDS e LPCI -- 23 WELDS e CORE SPRAY -- 14 WELDS e RECIRC -- 2 WELDS .
4 f MILLSTONE UNIT NO. 1 1980/1981 REFUEL OUTAGE EXTENT OF CRACKING , 0 [ SOLATION CONDENSER SUPPLY ICAJ-3 ICAJ-5 ICAJ-7 ICAJ-11 ICAJ-14 ICAJ-15 ICAC-F-17, 18 ICAC-F-19 ICAC-F-26, 27 ICAC-F-28 ICAC-BF-1 ICAC-BF-2 [NACCESSIBLE PENETRATION X-10A NELD e SHUTDOWN COOLING SCAJ-2 SCAJ-3 SCAJ-4 e LPCI , CCBJ-7 e--, <n
4- 6 MILLSTONE UNIT NO. 1 - 1980/1981 REFUEL OUTAGE .. REPAIR
SUMMARY
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. CORRECTIVE SYSTEM AFFECTED AREA. ACTION ISOLATION 1+ SUPFLY PIPING AT THE ISOLATION REPLACEMENT I CONDENSER- CONDENSERJ-BOTH N0ZZLE SAFE ENDS AND PIPING UP TO AND INCLUDING THE' FIR 9T ELBOW (CLASS II).-
- 2. SUPPLY PIPING FROM THE REACTOR REPLACEMENT VESSEL N0ZZLE SAFE END TO lie CONTAINMENT PENETRATION (CLASS I).
3 SUPPLY PIPING FROM THE CONTAIN- REPLACEMENT MENT ISOLATION PENETRATION VALVE CLASS.I). (TO THE SECOND 4- RETURN LINE' SEGMENT; REMOVED TO REPLACEMENT INTERNA WELDSCLASS (LLY I). INSPECT ADJACENT 5 RETURN LINE SEGMENT, REMOVED TO REPLACEMENT INTERNALLY INSP WELDS (CLASS . I)ECT ADJACENT
- 6. PROCESS PIPE TO FLUED HEAD WELD REPAIR ON THE ISOLATION CONDENSER SUPPLY CONTAINMENT PENQTRATION (CLASS I: INACCESSIBLE).
SHUTDOWN 1- PIPING FROM THE SUCTION SIDE OF REPLACEMENT COOLING THE REACTOR RECIRCULATION SYSTEM , TO THE SHUTDOWN COOLING SUPPLY
}NBOARD ISOLATION VALVE (CLASS I),
CLEANUP l- PIPING FROM THE SHUTDOWN COOLING REPLACEMENT LINE TO THE C EANUP MANUAL ISO-LATION VALVE CLASS I). LPCI 1. PIPING SP00L UPST8EAM OF LPCI-B REPLACEMENT LOOP CHECK VALVE (CLASS 11. b i E
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MILLSTONE 1 1972 CHLORIDE e IflTRUSION REPORT
- s EVENT: HIGH CHLORIDE, LOW PH EVEilT DURIflG REACTOR STARTUP RESULTING FROM SEAWATER IN-LEAKAGE THROUGH CONDEf!SER TUBE PIil H0LES AflD DEMIflERALIZER BREAK-THROUGH REACTOR STATUS: (AT TIME OF BREAKTHROUGH) 2% POWER, 980 PSI, 5310F OPERATOR RESP 0:lSE:
REACTOR SCRAM UPON HIGH REACTOR '!ATER CUilDUCTIVITY ALARM; ISOLATION C0flDEllSER SYSTEP ACTIVATED; RAPID PLAtlT C00LDOWN (1000F/HR.) POST EVENT" ACTIONS: POST INCIDEilT !!ATER QUALITY MEASUREMENTS CONFIRMED 3,4 PPM CL Iil ISO CONDEilSER EXTEilSIVE SYSTEM , FLUSHlilG AtlD RESTORATI0il TO WITHIil WATER QUALITV SPECIFICATIONS, EXTENSIVE COMPONENT EXAfUilATIONS (fl0NDESTRUCTIVE AND DESTRUCTIVE) SHOWED SOME RELATIVELY SHALLOW TRANSGRANULAR CRACKING. SYSTEM AND TRAINIllG MODIFICATI0ils TO MilllMIZE RECURREtlCE:
- C0tlDEflSER REFIT WITH 70/30 CU ill
- ADDITION OF ADDITIONAL CONDUCTIVITY CELLS
- IMPROVED PROCEDURES FOR OPERATOR RESPONSE TO HIGH CONDUCTIVITY F,EDC 10691
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FINDINGS OBTAINED TO DATE: o DYE PEllETRAilT INSFECTI0tl e EXTENT OF CRACKING MAPPED o OPTICAL METALLOGRAPHY e SCANNING ELECTRON MICROSCOPY o ELECTROPOTENTICKlilETIC REACTIVATION MEASUREMENTS o HARDNESS EVALUATIONS o CARBON CONTENT ANALYSIS e ROLE OF CHLORIDES IN SCC
DYE PENETRANT EXAM RESULTS o 3600 DYE PENETRANT INDICATION ON I,D, SURFACE SAFE END SIDE OF PIPE o 1200 DYE PENETRANT INDICATION ON PIPE SIDE . o NUMEROUS SMALL ( <.1/2" LONG) INDICATIONS REMOTE FROM WELD ON EITHER SIDE 1
MILLSTONE ISO CONDENSER SUPPLY LINE: DEPTH OF CRACKING IN SAFE END/ PIPE WELD ZONE SAFE END PIPE DEPTH % DEPTH % AZIMUTH (IN) THICKNESS (IN) THICKNESS 00 .215 29 --- --- 5.6 .097 13 .176 24 34 .152 20 .191 26 45 .170 23 .185 25 68 .294 40 0 0 101 .221 16 0 0 158 .302 41 0 0 191 .191 26 0 0 225 .412 54 0 0 259 .285 38 --- --- 293 .239 32 0 0 332 .136 18 .252 34 354 --- ---
.400 54 AVERAGE: .219 30%
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D OPTICAL FETALLOGRAPHY (
SUMMARY
) o INTERGRAi1ULAR STRESS CORROSION CRACKING ACCOUilTED FOR LARGE DYE PEI'lETRANT INDICATIONS e TRANSGRANULAR CRACKIflG IN AREAS WHERE SEllSITIZATION IS LESS LIMITED EXTEtlT OF DEPTH o ONE EXAMPLE OF WELD PENETRATION BY CRACK LOW FERRITE (r-0%) LOCALLY APPEARS TO ARREST Ifl HIGHER FERRITE REGIO:'l
J , s ELECTROPOTENT10 KINETIC REACTIVATION (EPR)* o CONFIRMED WELD HEAT AFFECTED ZONE SENSITIZATION PIPE SIDE: 5.36 SAFE END SIDE: 7.35 o CONFIRMED BASE SAFE END AND PIPE MATERIAL NOT SENSITIZED PRIOR TO WELDING PIPE SIDE: .19
~
SAFE END SIDE: 1.50
*2.0 =
MARGINAL SENSITIZATION FOR CRACKING UNDER
~
HIGH STRESS IN OXYGENATED WATER
b CARBON CONTENT ANALYSIS o CARBON CONTENT CONFIRMED TO BE WITHIN SPECIFICATI0il PIPE MATERIAL: .074 W/0 SAFE END MATERIAL: .062 W/0 SPECIFICATION: 4 .080 '.UO l I
HARDNESS EVALUATIONS o MEASUREMENTS ON PIPE AND SAFE END BASE MATERIAL o TYPICAL OF ANNEALED TYPE 304 o REGION OF COLD WORKED MATERIAL FROM WELD PREP MACHINING EXTENDING TO A DEPTH OF .003" o DEPTH OF COLD WORKED MATERIAL MUCH LESS THAN DEPTH OF TRANSGRANULAR CRACKIflG COLD WORK NOT UNUSUAL, NOT BELIEVED SIGNIFICANT TO OBSERVED CRACKING l
~
ISO CONDENSER $AFE END/ PIPE HARDNESS MEASUREfiENTs PIPE SAFE END DISTANCE FROM SURFACE KNOOP ROCKWELL KNOOP ROCKWELL
.002 390 Rc-39 352 Rc-35
.003 267 Rc-23 317 Rc-31
.004 267 Rc-23 267 Rc-23
.005 260 Rc-22 253 Rc-20
.006 260 Rc-22 253 Rc-20
.100 246 Ra-99 228 Rs-95 i
Rs(100) = Rc(21) ,
4 CHLORIDE EFFECTS ON IGSCC INITIATION o LITERATURE DATA SHOWS CRACK INITIATION ENHANCED DURING HIGH CHLORIDE, HIGH TEMPERATURE WATER EXPOSURE : TIME TO CRACK INITIATION REDUCED : THRESHOLD STRESS MAY BE REDUCED P o GE LABORATORY TESTS SHOW IGSCC IN SEVERELY SENSITIZED SAMPLES DUE TO BRIEF HIGH CHLORIDE, HIGH TEMPERATURE PRE-EXPOSURE o PIPE TESTS REPRODUCE CRACK PATTERN IN ISO-CONDENSER AT HIGH APPLIED STRESS ORDER OF MAGNITUDE REDUCTION IN TIME TO PIPE THROUGH-WALL CRACKING IN HIGH TEMPERATURE, HIGH CHLORIDE SIMULATION
- NO SIGNIFICANT EFFECT IN LOW TEMPERATURE, HIGH CHLORIDE TEST AND WATER QUALITY EXCURSION TESTS CHLORIDE EFFECTS PROMOTE INITIATION OF CRACKS AT SEVERAL AZIMUTHAL SITES i
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. Stringers of Ferrite (Top 50X, Bottom 200X) ;
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(Cracking Mode Is Transgranular). Note on the Top 4
Photoraicrograph That the Point of Initiation Is Lost Because of Small Size'and the Expansion of the Crack inside the Material (Top 50::, Bottom 200X) a u.m_.__ . _ _ . . . _ _ . . . _ --
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BRIEF CHLORIDE EXPOSURE EFFECTS Oil SUBSEQUENT CRACK PROPAGATION o LABORATORY TEST PROGRAM (10 CRACK GROWTH IN STAINLESS STEEL ITWOL STATIC SPECIMENS PRE-EXPOSED TO CHLORIDE SIMULATION TRANSIENT NO EVIDENCE OF ENHANCED FATIGUE CRACK GROWTH AFTER PRE-EXPOSURE o SPECIMENS WERE CONFIRMED TO CONTAIN TRANSGRAtlVLAR INI-TIATED CRACKS o NO DATA ON INTERGRANULAR CRACK GROWTH AFTER PRE-EXPOSURE TO CHLORIDE SIMULATION TRANSIEilT
NEDE 20593 1000 f
SC ATTER B AN D s
TYPE 344 STAINLESS STEEL 550 AND 6600F (R E F. 5)
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5 m V MACROSCOPIC DATA O 7 No.1. R.T. AIR O 117,5500F AIR O 5W. BWR A
v 0 7T. eWR. CHLoRioE CONT.
MICROSCOPIC D%TA (SCM)
O A 6W, BWR. CHLORIDE CONT.
O O 5W. BWR OV ~
' ^ I ' I !
10 10 joo 1000 STRESS INTENSITY R AN *iE (dK. kci in.)
Figure 12. Crack Growth Rate Ca:a as Func::an of Stress Intensity Ra~;e for 17 WOL Type 304 Stainless S: eel Specimens 20
CONCLUSI0FlS FROM METALLURGICAL o- .
EVALUAT10tl 0 iflTERGRAl'ULAR STRESS CORROSION CRACKli?G ACCCUNTS FOR OBSERVED MAJOR OIE PE"ETRAirl :NLICATI0 tis IN WELD HEAT AFFECTED ZONES 0 TRANSGRAtlULAR CRACKING IS LIMITED Ill DEPTH
(^> .032 INCH) AllD IS CONSISTENT AITH OBSERVED TRANSGRANULAR CRACKING It: EXAMINAT! OMS AFTER 1972 HIGH CHLORIDE TRAllSIENT o SCANNIt!G ELECTRON MICROSCOPY INDICATES NO OTHER CRACK GRO'lTil MECHANISM OPERATillG AT TIP OF DEEPEST CRACKS OTHER THAN IGSCC o LABORATORY DATA ILLUSTRATES SUBSTANTIAL INFLUENCE OF HIGH CHLORIDE LOW PH TRANSIENT ON CRACK INITIATION; ASSISTS MULTIPLE SIMULTANEOUS IGSCC INITIATION IN WELD HEAT AFFECTED ZONE
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FRACTURE MECHANICS EVALUATION -
CRACKED P!PE SECTIONS O STRUCTURAL MARGIN EVALUATION USING NET SECTION COLLAPSE CRITERIA ISO. CONDENSER LINE REPRESENTATIVE LINE - POSTULATED FLAW 0 LEAK BEFORE BREAV MARGIN ASSESSMENT i HSii 3/4/81
\
n NCM LN AL STRESS IN THE UNCA ACXED SECTICN OF PtPE Pm
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NEUTRAL Pm gg of = PLCYf STRE3S STMESS OtSTRIBb" TION IN THE CR ACKED SECTION AT THE PCINT OF COLLAPSE Sche =atic Shoving Stress Distributed in a A Cracked Pipe at the Point of Collapse 4
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or a, -- . v. , ,, ,e- -~ a ,n- .
NET SECTION COLLAPSE APPROACH .
FOR FAILURE ASSESSMENT OF CRACKED PIPES 0 ASSUMES FAILURE BASED ON LIMIT LOAD INSTABILITY, O CONSIDERS PRIMARY MEMBRANE AND BENDING STRESSES, 0 VERIFIED EXPERIMENTALLY FOR AUSTENITIC STAINLESS STEEL.
O USES INFORMATION AVAILABLE IN ASME CODE STi;ESS REPORTS, O FLOW STRESS BASED ON YIELD AND ULTIMATE STRENGTH VALUES.
O CAN BE RELATED TO GENERAL YIELD FRACTURE MECHANICS MODEL.
9 y - , _ . . . . . _ , . _ ,
MILLSTONE ISO CONDENSER STEAM SUPPLY ,
LINE CRACK EVALUATION DATA PERTINENT TO FAILURE ANALYSIS DIAGRAM:
0 Pm (AXIAL): 4.9 KSI DUE TO DESIGN PRESSURE 0 P3 : 0.32 KSI DEAD WEIGHT (WATER) 1.02 KS! OBE 4.47 KSi WATER HAMMER TOTAL P 3 =
5.8 KS!
O FLOW STRESS o f =
41.2 KSI BASED ON AVERAGE OF CODE YIELD AND ULTIMATE FOR SA 358 CLASS 1 TYPE 304 SS AT 550cp, O PIPE SIZE AND SCHEDULE IS 12 INCH, SCH 80.
l HSM 3/4/81
-. . _ . . . ~ . . . . .
l i
MILLSTONE ISO CONDEf!SER STEAM SUPPLY. 3 LINE CRACK EVALUATION ~
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il Pb = 16.5 ksi f gd.6 _
p .= 4.9 ksi (Design -
;: f j Pressure)
-i
.$ dP = 5.8 ksi-(DW+03E+ Water-Hammer) s o f = 41.2 ksi
_. 0. 4 - - '
s L
- Y u I g Observed Crack (Based on
- O
."- Average Circumferential Depth) l 0.2 - ..
I ;
i O i t 7 i , ,, ,
t 0 0.2 0.4 0.6 0.8 1.0 FRACTION OF CIRCUMFEPENCE a/
l :
SIGNIFICANT MAP. GIN AGAINST LI"IT I'OMENT EXISTS FCR THE OBSERVED FLAU t f
3/4/81 :
a l
LEAK BEFORE BREAK ASSESSENT ,s.
ISO CONDENSER FLAW t.
i 0 NON-VilIFORi1 FLAW SHAPE SUGGESTS PREFERENTIAL' CRACK GROWTH. g
-BENDING MOMERT STRESSES WCULD PRO.50TE FUP.TiiER FURTHER PREFERENTIAL CRACK GROWTH 0 CRACK GROWTH NOPfiALLY FASTER AT DEEPER CRACK LOCATIONS, THEREBY LEADIl!G TO LEAK, O EVEN IF UNIF0P11 GROWTH OCCURS AliD FLAW SHAPE ,
IS MAINTAli!ED, LEAK BEFORE BREAK WILL STILL BE SATISFIED, t
LEAK BEFORE BREAK ASSURED i 9 i HSH 3/4/81 i-n
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MIN. x 0 1 i i i 0 0.2 0.4 0.6 0.8 1.0 FRACTION OF CIRCUMFERENCE c/n HSH 3/4/81
REPRESENTATIVE LINE - POSTULATED FLAW EVALUATI0f!
I i
0 RECIRCULATION PIPIflG REVIEWED MEDIUM (12") AND LARGE (28") SIZE PIPES USED MAXIMUM VALUES REPORTED IN STRESS REPORT 0 STRESSES PRESSURE (AXIAL) 6 KSI DEAD WEIGHT 1,5 KSI OBE 3,5 KSI FLOW STRESS 41,25 KS! AT 550 F.
HSM 3/4/81
J MILLSTONE RECIRC LINE EVALUATI0fl'FOR POSTULATED FLAWS- ,
e f o xy 2 s-4'-
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d-g ( 4 .l y n 9 j N h s NN%N 5
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/
s failure Line Factor N ,
C \ N/ d of_ Safety = 2.0 t
P = 6 ksi
- [; P + P b
{=
+
SI M
- S 0.6 - -
=
t--
a
= ,
E5
,c.4 _ _
S b
5 5
0.2 _ _
0 i ' I i 0 0.2 0.4 0.6 0.8 1.0 FRACTION OF CIRCUMFEREtiCE e/n SIGNIFICAfiT MARGIN EXISTS HSM 3/4/81 L. . ... - - - -.....-. - . . . - . . _ - _ - . . . . - . . - - . - . . - . . . . . . - . - - . . . . . .
l l
]
l CONCLUSIONS .
l 0 STRUCTURAL MARGIN EXISTS FOR ;^ ONDENSER CRACKI:!G.
O LEAK BEFORE BREAK MARGIN EXPECTED FOR. ISO CONDEf1SER PIPE SECTION, -
^
0 SIGflIFICANT STRUCTURAL MARGIN EXPECTEl IN OTHER REPRESENTATIVE PIPE SECTIONS, 9
HSM 3/4/81
-- e s , . , , . . . , <
i
' ~
BACKGROUi4D: )
l
-- IEARING Mooutus-REF: f1UREG 0311 i'lVREG/C?-0010 NUREG/CR-1220.VOL.I, VOL.ll I1UREG/CR-1221
--flRST APPLICATION TO PIPING REF: llVREG/CR-0838 i
i
~
I b
4 no interceding cleavage instability (high temperature)
, 1 J
* ~#
', I, [ ^#
2oo stable tearing i J P
! /
i d)
/ da ) dJ/da constant
/
- intercedir3 cleavage
\
% instability af ter start of stable tearing (trans i tion temperature) gbeginning of stable tearing (Jk)
\
i \
hintercading cleavage instability before stable
, j tearin-; (at ica temperature)
N N extension due to blunting La j a >-
- - sharp crack (prior to loading) a i
-- blunting prior to tearing l)I (aa = 21ao b)
] aa I
- i tearing af ter blunting to comencement f of stable tearing (M = constant) da
-- -#L_ , 33
, FIGURE 1 - The J-Integral R-curves (with some diagramatic details following Rice [4]).
I C01 CEPT OF TEARING. MODULUS
\ j f
/
J
-r{-T- gg7 , E dJ gg7 w?~
s I f
t T = E dJ APPL 7 A do bOC 2
I STABLE t4AT APPL
. Tgg7 < T 4 ppt .
UNSTABLE r-*--% - . - ,-- -.wf..v ,,.,, .o-. e,- - - , ,.,,,nm..,-,w.
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6
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Figure 9. Fixed beam under uniform bending, d'= constant. ,
f .
4 r -. r .
4 e
k SIMPLIFIED STABILITY NiALYSIS
~
0 d@ = d@EL PL
= M 0 i EL u El J .
O gg=
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=[,2 , f$ l
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F2 /F g T= F3 . L+p,JE g R Jo 'R ]
l
\
l
\
> l
TYPICAL PIPING SYSTEMS s u,-
+
> p l ,. -m
~
,a ,/
, /
/
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p.
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r - sev',e5 w_ mwr.-- w w -- v - ww er e- -w w we ee-wv re w , t r-ww .e,-- e,r te- as--+ - e- ar.e+ew-=-+---~ e w . w- w we-r----emse- -+1eme- = e e *w- rt-- - - - - -wr, ev-w&-+c* w w w-- w 6rv-- r m--m- ,
=~
i L- .uJ.. m . _ e
$ k
)
k FEf1 RESULTS
[9]=}F _M
~ K}=[F ~
~
K MI " FROMlI(K Kl2 K21 K22 RECALL--
g = i1L EL El ,
IN GENERAL, L= L ggg L ggg =U K
MIN THEN, i
' T APPL = F1.LEFF + p,)
JE R ' ry 2 R -
- J l
s l
J from single specimen experiments -
@ CCT Panel,2c =o 3.0 in., t = 0.324 in. (R.P.M.)
@ Three point bend bar, t = 0.335in. (Gerwood,et ci:
@ # 2T Pipe (4 -pt bend),2c = e 3.0", t = 0.35" (Zahoor)
@ # IT Pipe (4 -pt bend),2c o= 5.25" t = 0.35" (Zahoor) 3 -
30 -
N.
.5 N
E 25 -
.5 o 20
~
5 15 -
lo f
5 -
1 I I I I I o
o o.2 c.4 o.6 o.8 1.o 1. 2 1.4 60, in. -
J-RESISTANCE CURVES FOR TYPE 304 STAINLESS STEEL FOR DIFFERENT SPECIMEN GEOMET:;IES TESTED AT ROOP. TEM 0ERATURE
4 J-INIIC? C Es77.u.*..,
CFACKFa *~:CR*CI[iDI::C prpe~~<=r. 70 _~ , CMzy,,377,q7 7 k
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= Applied ( Analysis)
I i
21
---- Material
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4 O 0 12 IG 20 24 J, 100O in.-lb /in.2 CR ACK GROV!TH INSTABILITY PREDICTION FOR THE
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, tiRTERIAL = R358.CL1,TP304 m
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MILLST0f4E UNIT NO 1 IGSCC MITIGATI0f1 :
NUREG 0313 C0flPLIANCE ,
l O ALL CURNACE SENSITIZED SAFE ENDS REPLACED e RECIRC BYPASS REMOVED 0 ISO-CONDENSER TUBES REPLACED e CRD HYDRAULIC RETURN LINE REROUTED - VESSEL N0ZZLE CAPPED o RPV HEAD SPRAY SPOOL PIECE REDESIGNED AND REPLACED e CORE SPRAY REPLACED (MOST OF CLASS 1) o CLEANUP RETURN SPOOL PIECE REPLACED 0 CRD SUPPLY FROM DE0XYGENATED SOURCE _
o STARTUP VENTING USED 0 lSOLATION CONDENSER SUPPLY REPLACED (MOST OF CLASS 1)
O CONFORMING MATERIAL USED FOR ALL REPLACEMENTS 0 REROUTE OF CLEANUP RETURN PLANNED FOR 1982 PER NUREG 0619 0 WELD SUSCEPTIBILITY MATRIX IN DEVELOPMENT C SUBSTANTIAL EXAMINATIONS PERFORMED-(ISI):
RECIRC 40%
I~S0-CONDENSER SUPPLY 100%
ISO-CONDENSER RETURN 100%
CLEANUP RETURN 100%
CLEANUP SUPPLY 100%
l SHUTDOWN COOLING 100% .
l LPCI - A 100%
i LPCI - B 95%
CORE SPRAY A 100%
CORE SPRAY B 100%
I
MILLSTONE UNIT NO. 1 ISE BULLETINS 79-02/79-14 STATUS o ALL PHYSICAL WALKDOWNS COMPLETED 0 MAJORITY OF STRESS ANALYSIS AND HANGER MODIFICATIONS COMPLETED o REMAINING ANALYSIS / MODIFICATIONS COMPLETED BY 1982 OUTAGE O WATER HAMMER ANALYSIS COMPLETED FOR ISO-CONDENSER SYSTEM o ADDITIONAL PIPE SUPPORTS DESIGNED FOR ISO-CONDENSER SYSTEM e ALL SUPPORTS TO BE COMPLETED FOR ISO-CONDENSER SYSTEM PRIOR TO STARTUP 0 IOTAL PROJECT COST IN EXCESS OF $20 MILLION
j
)
MILLSTONE UNIT il0. 1 STAINLESS STEEL PIPE CRACKING
SUMMARY
AND CONCLUSIONS
SUMMARY
0 INSPECTIONS EXCEEDING NUREG 0313 PERFORMED o ALL CRACKED MATERIAL REPLACED WITH NUREG 0313 MATERIAL e NUREG 0313 LEAK-BEFORE-BREAK CONCLUSION REMAINS VALID 0 LEAKAGE DETECTION SYSTEMS OPERATIONAL o NUREG 0313 ISI TO CONTINUE CONCLUSIONS 0 ?IPE CRACKING REMAINS NON-SAFETY PROBLEM AS - PREVIO!JSLY CONCLUDED IN NUREG 0313 e CONTINUED SAFE PLANT OPERATION IS ASSURED l l
MEETING
SUMMARY
DISTRIBUTION: hocket50-249
- NRC VUM Local PDR TERA NSIC ,
g ORB #5 Reading D. Eisenhut G. Lainas N. Hughes OELD o 9% V OI&E (3) ACRS (16) e fg s I g D. Crutchfield f~ gg* 1 y,h 4 J. Shea 1. G. Zech h MAR 201981 m L { g7l H. Smith W. H. Koo
-g u g D,,p A.
H. K. Shaw g W. J. Collbs 4 J. R. Fair / 3, g , a C. Y. Cheng K. Ho Cotter, Fracture Proof Design Corp., St. Louis K. Wichman R. A. Hermann P. Y. Chen G. D. Aikire, NUSCO P. A. Blasioli, NUSCO E. DeBarba, NUSCO J. Lemaire, GE , H. Mehta, GE J. Kilty, GE E. Romesberg, GE ,
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