ML12089A631
| ML12089A631 | |
| Person / Time | |
|---|---|
| Site: | Indian Point  |
| Issue date: | 02/20/2004 |
| From: | American Society of Mechanical Engineers (ASME) |
| To: | Atomic Safety and Licensing Board Panel |
| SECY RAS | |
| Shared Package | |
| 12089617 | List: |
| References | |
| RAS 22134, 50-247-LR, 50-286-LR, ASLBP 07-858-03-LR-BD01 | |
| Download: ML12089A631 (10) | |
Text
CASE CASES OF ASME BOILER AND PRESSURE VESSEL CODE N-S13-2 Approval Date: February 20, 2004 The ASME Boiler and Pressure Vessel Standards Committee took action to eliminate Code Case expiration dates effective March 11,2005. This means that all Code Cases listed in this Supplement and beyond will remain available for use until annulled by the ASME Boiler and Pressure Vessel Standards Committee.
Case N*513*2 2 PROCEDURE Evaluation Criteria for Temporary Acceptance of (a) The flaw geometry shall be characterized by volu Flaws in Moderate Energy Class 2 or 3 Piping metric inspection methods or by physical measurement.
Section XI, Division 1 The full pipe circumference at the flaw location shall be inspected to characterize the length and depth of all flaws Inquiry; What requirements may be used for temporary in the pipe section.
acceptance of flaws, including through-wall flaws, in mod (b) Flaw shall be classified as planar or nonpJanar.
erate energy Class 2 or 3 piping, without performing a (c) When multiple flaws, including irregular (com repair/replacement activity? pound) shape flaws, are detected, the interaction and com bined area loss of flaws in a given pipe section shall be Reply: It is the opinion of the Committee that the follow accounted for in the flaw evaluation.
ing requirements may be used to accept flaws, including (d) A flaw evaluation shall be performed to determine through-wall flaws, in moderate energy Class 2 or 3 piping, the conditions for flaw acceptance. Section 3.0 provides without performing a repair/replacement activity for a lim accepted methods for conducting the required analysis.
ited time, not exceeding the time to the next scheduled (e) Frequent periodic inspections of no more than 30 outage. day intervals shall be used to detennine if flaws are growing and to establish the time at which the detected flaw will reach the allowable size. Alternatively, a flaw growth eval uation may be performed to predict the time at which the 1 SCOPE detected flaw will grow to the allowable size. The flaw (a) These requirements apply to the ASME Section m, growth analysis shall consider the relevant growth mecha ANSI B31.1, and ANSI B31.7 piping, classified by the nisms such a<; general corrosion or wastage, fatigue, or stress corrosion cracking. When a flaw growth analysis is Owner as Class 2 or 3. The provisions of this Case do not used to establish the allowable time for temporary opera apply to the following:
tion, periodic examinations of no more than 90 day inter
( I) pumps, valves, expansion joints and heat vals shall be conducted to verify the flaw growth analysis exchangers; predictions.
(2) socket welds; (f) For through-wall leaking flaws, leakage shall be (3) leakage through a flange joint; observed by daily walkdowns to confinn the analysis con (4) threaded connections employing nonstructural ditions used in the evaluation remain valid.
seal welds for leakage protection. (g) If examinations reveal flaw growth rate to be unac (b) The provisions of the Case apply to Class 2 or 3 ceptable. a repair or replacement shall be performed.
piping whose maximum operating temperature does not (h) Repair or replacement shall be performed no later exceed 200°F (93°C) and whose maximum operating pres than when the predicted flaw size from either periodic sure does not exceed 275 psig (1.9 MPa). inspection or by flaw growth analysis exceeds the accept (c) The following fl aw evaluation criteria are permitted ance criteria of 4.0, or the next scheduled outage, whichever for pipe and tube. The flaw evaluation criteria are permitted occurs first. Repair or replacement shall be in accordance for adjoining fittings and flanges to a distance of (RoOV2 with IWA-4000 or IWA-7000, respectively, in Editions from the weld centerline. and Addenda prior to the 1991 Addenda; and, in the 1991 (d) The provisions ofthis Case demonstrate the integrity Addenda and later, in accordance with lWA-4000.
of the item and not the consequences of leakage. It is the 0) Evaluations and examination shall be documented responsibility of the Owner to demonstrate system opera in accordance with IW A-6300. The Owner shall document bility considering effects of leakage. the use of this Case on the applicable data report fonn.
The Committee's function is to establish rules of safety. relating only to pressure integrity, governing the construction of boilers, pressure vessels, transport tanks and nuclear components, and inservice inspection for pressure integrity of nuclear components and transport tanks, and to Interpret these rul6$ when questions arise regarding their intent. This Code does not address other safety issues relating to the constructton of boilers, pressure vessels, transport tanks and nuclear components.
and the inservice inspection of nuclear components and transport tanks. The user of the Code should refer to other pertinent codes, standards, taws, regulations or other relevant documents.
I (N-513-2)
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CASE (continued)
N..513-2 CASES OF ASME BOILER AND PRESSURE VESSEL CODE FIG. 1 THROUGH-WALL FLAW GEOMETRY (2)
Uj = (S, + Su)/2 (3) where p = pressure for the loading condition Do = pipe outside diameter OJ' ::::: flow stress Sy = Code specified yield strength Su = Code specified ultimate tensile strength and SFm = structural factor on primary membrane stress as specified in C-2622 Material properties at the temperature of interest shall be used.
(e) For planar flaws in ferritic piping, the evaluation procedure of Appendix C shall be used. Flaw depths up to 100% of wall thickness may be evaluated. When through-wall circumferential flaws are evaluated in accor (al Circumferential Flaw dance with C-5300 or C-6300, the flaw penetration (alt) shall be set to unity. When through-wall axial flaws are evaluated in accordance with C-5400, the allowable length is defined by Eqs. (1) through (3), with the appropriate structural factors from Appendix C, C-2622. When through-wall flaws are evaluated in accordance with C-7300 or C-7400, the formulas for evaluation given in C-4300 may be used, but with values for F"" Fb , and F applicable to through-wall flaws. Relations for F"" Fb , and F that take into account flaw shape and pipe geometry (R I t ratio) shall be used. The appendix to this Case provides equations for Fill' Fb, and F for a selected range of R It.
Geometry of a through-wall crack is shown in Fig. I.
(d) For nonplanar flaws, the pipe is acceptable when the remaining pipe thickness (tp) is greater than or equal (bl Axial Flaw to the minimum wall thickness 1I11i,,:
3 FLA W EVALVA TION tmill = 2(S + O.4p) (4)
(a) For planar flaws, the flaw shall be bounded by a where rectangular or circumferential planar area in accordance with the methods described in Appendix C. IWA-3300 p = maximum operating pressure at flaw location shaH be used to determine when multiple proximate flaws S = allowable stress at operating temperature and the are to be evaluated as a single flaw. The geometry of a longitudinal stress limits for the Construction through-wall planar flaw is shown in Fig. 1. Code are satisfied for a unifonn wall thickness (b) For planar flaws in austenitic piping, the evaluation equal to tp procedure in Appendix C shall be used. Flaw depths up Alternatively, an evaluation may be performed as given to 100% of wall thickness may be evaluated. When below. The evaluation procedure is a function of the depth through-wall circumferential flaws are evaluated, the for and the extent of the affected area as illustrated in Fig. 2.
mulas for evaluation given in C-5320 of Appendix C may ( I) When the width of wall thinning Wm that exceeds be used, with the flaw penetration (alt) equal to unity. tmbl> is less than or equal to 0.5 (R"t)I!2, where R" is the outside radius and Wm is defined in Fig. 2, the flaw can When through-wall axial flaws are evaluated, the allowable be classified as a planar flaw and evaluated in accordance flaw length is: with 3(a) through 3(c), above. When the above requirement is not satisfied, (2) shall be met.
(2) When the transverse extent of wall thinning that exceeds tmill' L",(t), is not greater than (R"tmlll )lI2, ta/o(' is 2 (N-5J3-2)
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CASE (continued)
CASES OF ASME BOILER AND PRESSURE VESSEL CODE N-513-2 FIG.2 ILLUSTRATION OF NON PLANAR FLAW DUE TO WALL THINNING Section A-A Transverse (circumferential)
Axial direction determined from Curve 1 of Fig. 3, where Lm(li is defined where (Tb is the nominal pipe longitudinal bending stress in Fig. 2. When the above requirement is not satisfied, (3) resulting from all primary pipe loadings.
shall be met. (e) When there is through-wall penetration along a por (3) When the maximum extent of wall thinning that tion of the thinned wall, as illustrated in Fig. 4, the flaw exceeds tmi,,, L"" is less than or equal to 2.65 (Rotmin)1I2 may be evaluated by the branch reinforcement method.
and tnom is greater than 1.13t",i,,, ta/oc is determined by The thinned area including the through-wall penetration satisfying both of the following equations:
shall be represented by a circular opening at the flaw loca tulor ~ 1.5~ [1 _1,10"'] + 1.0 (5) tion. Only the portion of the flaw lying within tad} need be considered as illustrated in Fig. 5. When evaluating multi tmi" L tmill ple flaws in accordance with IWA-3330, only the portions (6) of the flaws contained within tad} need be considered.
The minimum wall thickness, tmil' , shall be determined by eq. (4). For evaluation purposes, the adjusted wall thick When the above requirements are not satisfied, (4) shall ness, tad}, is the postulated thickness as shown in Fig. 5.
be met.
The pipe wall thickness is defined as the thickness of the (4) When the requirements of (I), (2), and (3) above pipe in the non-degraded region as shown in Fig. 5(a). The are not satisfied, talm.' is determined from Curve 2 of Fig.
- 3. In addition, taloe shall satisfy the following equation: diameter of the opening is equal to dad} as defined by tad}
as shown in Fig. 5(a). The postulated value for tad} shall be greated than tmill and shall not exceed the pipe wall
[ 0.5 + (11/0'") ((J'b)]
S fmlll thickness. The tad} value may be varied between t",ill and fmill ~ ~-~1"".8""':"....!-":';;;" (7) the pipe wall thickness to determine whether there is a 3 (N-5J3-2)
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CASE (continued)
N-S13-2 CASES 01<' ASME BOILER AND PRESSURE VESSEL CODE FIG.3 ALLOWABLE WALL THICI(NESS AND LENGTH OF LOCALLY THINNED AREA 0.8 0.6
'S J
--...~"
0.4 0.2 o L -_ _ _ _ ~ _ _ _ _ _ __ L_ _ _ _ _ _ ~ ____ ~~~ __ ~~ _ _ _ _L __ _ _ _ ~ ______ ~
o 2 3 5 6 7 8 combination of tadj and d"dj that satisfies the branch rein evaluation, shall not exceed the lesser of the flow area of forcement requirements. the pipe or 20 in.2 (130 cm 2).
The required area reinforcement for the postulated circu (g) In performing a flaw growth analysis, the procedures lar opening, d"dj and f cu},;' as illustrated in Fig. 5(b), shall in C-3000 may be used as guidance. Relevant growth rate be calculated in accordance with NC-3643.3 or ND-3643.3, mechanisms shall be considered. When stress corrosion as appropriate. If a flaw growth analysis is performed, the cracking (SCC) is active, the following growth rate equa growth in flaw dimensions shall consider the degradation tion shall be used:
mechanism(s) as relevant to the application. The flaw is acceptable when there is sufficient thickness in the da/dt = S.l'CK,~ax (8) degraded area to provide the required area reinforcement. where da/dt is flaw growth rate in incheslhour. Kmax is the Compliance with the primary stress limits of the Construc maximum stress intensity factor under long-term steady tion Code shall be verified. The flow area of the flaw, or state conditions in ksi in.O.5, Sr is a temperature correction the total of the flow areas of multiple flaws that are com factor, and C and n are material constants.
bined into a single flaw for the purpose of evaluation, shall not exceed the lesser of the flow area of the pipe or 20 For intergranular SCC in austenitic steels, where Ts 200°F in. 2 (130 cm 2 ). (93°q.
(j) Alternatively, when there is through-wall penetration C 1.79 X 10-8 along a portion of the thinned wall as illustrated in Fig. 4 Sr = I the flaw may be evaluated as two independent planar n ::;;: 2.161 through-wall flaw-one oriented in the axial direction and For transgranular SCC in austenitic steels. where T s 200°F the other oriented in the circumferential direction. The (93°q.
minimum wall thickness tmill' shall be determined by eq.
(4). The through-walllenghts for each flaw are the lenghts C 1.79 x 10-7 Sr 3.71 X 108 [1O(0.01842T 12.25)]
Lax;al and L circ, where the local wall thickness is equal to tmlll as projected along the axial and circumferential planes n = 2.161 as shown in Fig. 4. The two planar flaws so constructed The temperature T is the metal temperature in degrees shall be evaluated to 3(a) and 3(b) or 3(c), as appropriate. Fahrenheit. The flaw growth rate curves for the above SCC If a flaw growth analysis is performed, the growth in flaw growth mechanisms are shown in Figs. 6 and 7. Other dimensions shall consider both corrosion and crack-growth growth rate parameters in eq. (8) may be used. provided mechanisms as relevant to the application. The flow area they are supported by appropriate data.
of the flaw, or the total of the flow areas of multiple flaws (h) For nonferrous materials, nonplanar and planar flaws that are combined into a single flaw for the purpose of may be evaluated following the general approach of 3(a) 4 (N-5J3-2J Copy,lghi ASME Intem.tioMl (BPVC)
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CASE (continued)
CASES 0];' ASME BOILER AND PRESSURE VF.sSEL CODE N-513-2 FlG.4 ILLUSTRATION OF THROUGH-WALL NONPLANAR FLAW DUE TO WALL THINNING (min I Through-wall penetration
+1 taY~ Section A-A 1 - - - - Laxial - - - 1 Transverse (circumferential)
Axial direction direction 5 (N-513-2)
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CASE (continued)
N-513-2 CASES OF ASME BOILER AND PRESSURE VESSEL CODE FIG.5 ILLUSTRATION OF ADJUSTED WALL THICKNESS AND EQUIVALENT HOLE DIAMETER I Through-wall penetration T Pipe
............~"""--i _ _ _ _ _-+............... ~~lwall (a) Adjusted Wall Thickness (bl Equivalent Hole Representation 6 (N-513-2)
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CASE (continued)
CASES OF ASME BOILER AND PRESSURE VESSEL CODE N-513-2 through 3(g) above. For planar flaws in ductile materials, L circ length of through-wall crack for the hole diam the approach given in 3(b) and 3(g) may be used; otherwise, eter penetration in the circumferential direction the approach given in 3(c) and 3(g) should be applied. of the pipe Structural factors provided in 4 shall be used. It is the Lm = maximum extent of a local thinned area with responsibility of the evaluator to establish conservative t < tmin estimates of strength and fracture toughness for the piping L III (,,) = axial extent of wall thinning below tmill material. Lm(t) = circumferential extent of wall thinning below tmill R = pipe radius 4 ACCEPTANCE CRITERIA Ro = outside pipe radius Piping containing a circumferential planar flaw is accept S allowable stress at operating temperature able for temporary service when flaw evaluation provides SF", = structural factor on primary membrane stress a margin using the structural factors in Appendix C, ST = coefficient for temperature dependence in the C-2621. For axial planar flaws. the structural factors for crack growth relationship temporary acceptance are as specified in Appendix C, S" = Code-specified ultimate tensile strength C-2622. Piping containing a nonplanar part through-wall S\, = Code-specified yield strength flaw is acceptable for temporary service if tl' ~ t"loco where W", = maximum extent of a local thinned area per taloc is determined from 3( d). Piping containing a non planar pendicular to Lm with t < tmin through-wall flaw is acceptable for temporary service when e = half crack length the flaw conditions of 3(e) or 3(f) are satisfied. daldt = flaw growth rate for stress corrosion cmcking d",tj := diameter equivalent circular hole at t(((tj dmil! = diameter of equivalent circular hole at tmi11 5 AUGMENTED EXAMINATION f = total crack length = 2e An augmented volumetric examination or physical mea fall = allowable axial through-wall flaw length surement to assess degradation of the affected system shall n = exponent in the crack growth relationship p = maximum operating pressure at flaw location be performed as follows:
(a) From the engineering evaluation. the most suscepti t = wall thickness t(!(lj = adjusted wall thickness which is varied for ble locations shall be identified. A sample size of at least evaluation purposes in the evaluation of a five of the most susceptible and accessible locations. or. through-wall non planar flaw if fewer than five, all susceptible and accessible locations taloc = allowable local thickness for a nonplanar flaw shall be examined within 30 days of detecting the flaw. tmin = minimum wall thickness required for pressure (b) When a flaw is detected, an additional sample of loading the same size as defined in 5(a) shall be examined. tllOll! = nominal wall thickness (e) This process shall be repeated within 15 days for tp = minimum remaining wall thickness each successive sample, until no significant flaw is detected A = nondimensional half crack length for through-or until 100% of susceptible and accessible locations have wall axial flaw been examined. OJ' = material flow stress 0;, = pipe hoop stress due to pressure 0;, == nominal longitudinal bending stress for pri 6 NOMENCLATURE mary loading without stress intensification C = coefficient in the crack growth relationship factor Do = outside pipe diameter (9 = half crack angle for through-wall circumferen F nondimensional stress intensity factor for tial flaw through-wall axial flaw under hoop stress F" = nondimensional stress intensity factor for 7 APPLICABILITY through-wall circumferential flaw under pipe This Case is applicable from the 1983 Edition with the bending stress Winter 1985 Addenda through the 2001 Edition with the Fm = nondimensional stress intensity factor for 2003 Addenda. References in this Case to Appendix C through-wall circumferential flaw under mem shall mean Appenidx C of the 2002 Addenda. For editions brane stress and addenda prior to 2002 Addenda, Class I pipe flaw L = maximum extent of a local thinned area with evaluation procedures may be used for other piping classes.
t < t nom As a matter of definition, the term "structural factor" is Laxial = length of through-wall crack for the hole pene equivalent to the term "safety factor" that is used in earlier tration in the axial direction of the pipe editions and addenda.
7 (N-513-2)
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CASE (continued)
N-513-2 CASES OF ASME BOILER AND PRESSURE VESSEL CODI:!:
FIG. b FLAW GROWTH RATE FOR IGSCC IN AUSTENITIC PIPING 1.0E-02 1.0E-03 r-r-
~
Austenitic Piping I T-::; 200F
~
~
l - i ~ *
.E 1.0E-04 I am 1!f
§ I L
~
~ /
"t:l V
m a:r ro a::
1.0E-05 m
.s:::
~0 L
<:5
"""<oJ U '"
1.0E-OS tmr ~
~~ V
/
1.0E-07
/
/
n
/
1.0E-08 1 10 100 Stress Intensity Factor, K (ksi in. o.5 )
GENERAL NOTE: (SI conversion: 1.0 in/hr 7.06 x 10') mm/sec; 1.0 Ksi in.O. 5 1.099 MPa m O*5; *C [OF - 32J11.8).
8 (N-513-2)
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CASE (continued)
CASES 01<' ASME HOlLER AND PRESSURE VESSEL CODE N-S13-2 FIG_ 7 FLAW GROWTH RATE FOR TGSCC IN AUSTENITIC PIPING 1.OE-02 1.OE-03
- A""'"it;'~=
T<20OF d I i. V B
~
§ 1.OE-04 a; I I I V
/'
L
~~
1/1'
~
~
is 1.0E-OS itil cr:
..c:
~
0 1.OE-OS T-20OF *
/
L
/
L ii l T= 100F I e.!)
.>(.
m
(,)
til
.... L
~m u /'
1.OE-07
- v. I
/
,/ J J.J.J 1.OE-08 1.0E-09
/
I I I
=+
1 10 100 Stress Intensity Factor, K (ksi i n.O. 5 )
GENERAL NOTE: (SI conversion: 1.0 inlhr = 7.06 x 10" mm/sec; 1.0 Ksi in. a.s 1.099 MPa mO. 5; °C = [OF 32J/1.8J.
9 (N-513-2)
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CASE (continued)
N 513-2 CASES OJ.' ASME BOILER AND PRESSURE VESSEL CODE MANDATORY APPENDIX I RELATIONS FOR F m , F h , AND F FOR THROUGH-WALL FLAWS 1-1 DEFINITIONS Ab :: -3.26543 + 1.52784 (Rlt) - 0.072698 (Rlt)2
+ 0.0016011 (Rlt)3 For through-wall fta ws, the crack depth (a) will be B" == 11.36322 - 3.91412 (Rlt) + 0.18619 (Rlt)2 replaced with half crack length (c) in the stress intensity
- 0.004099 (Rltp factor equations in C-73DO and C-7400 of Section XI, Cb = -3.18609 + 3.84763 (Rlt) - 0.18304 (Rlt)2 Appendix C. Also, Q will be set equal to unity in C-7400.
+ 0.00403 (Rlt)3 Equations for Fm and Fb are accurate for Rlt between 5 1-2 CIRCUMFERENTIAL FLAWS and 20 and become increasingly conservative for Rlt For a range of Rlt between 5 and 20, the following greater than 20. Alternative solutions for F", and Fb may equations for Fm and F" may be used: be used when R It is greater than 20.
1-3 AXIAL FLAWS For internal pressure loading, the following equation for where F may be used:
e == Half crack angle = clR R = Mean pipe radius F = I + 0.072449.1 + 0.64856.1 2 - 0.2327.1 3 t Pipe wall thickness
+ 0.038154;\4 - 0.0023487;\5 and where Am == -2.02917 + 1.67763 (Rlt) 0.07987 (Rlt)2
+ 0.00176 (Rlt)3 c = half crack length A cl(Rnt/J.
Bm == 7,09987 - 4.42394 (Rlt) + 0.21036 (RId
- 0.00463 (Rlt)3 The equation for F is accurate for ;\ between 0 and 5.
C m = 7.79661 + 5.16676 (Rlt) - 0,24577 (Rlt)2 Alternative solutions for F may be used when ;\ is greater
+ 0.00541 (RIt)3 than 5.
10 (N-513-2)
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