ML18018A820
| ML18018A820 | |
| Person / Time | |
|---|---|
| Site: | Harris  |
| Issue date: | 05/04/1973 |
| From: | SOUTHWEST FABRICATING & WELDING CO. (SUBS. OF IU |
| To: | |
| Shared Package | |
| ML18018A805 | List: |
| References | |
| 4-109, NUDOCS 8310130290 | |
| Download: ML18018A820 (15) | |
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PROCEOURE HO:
4-109
'OT BENDING OP hUSTKNITIC SThlNLESS STEEL PIPING
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PAGE 1
OF 1
Dna 4-30-73 1
Hot bending is defined as forming at temperatures of 800 F and above.
2.
Pipe shall be selected so that the minimum wall thickness after bending willbe aot less than the calculated minimum wall thickness required for straight pipe.
)
3.
Qcldcd plate pipe shall have thc longitudfnal scam on the neutral axis of the bead.
4.
The centcrlinc radius of a bend will not aormally be less than five (5) times the aominsl pipe diameter aad shall not be less than permitted by Fig. 2 in PFI STD ES 3, 5.
Thc pipe shall be packed with dry, iron free sand and thc ends oha11 be plugged prfor to heating.
6.
The area of the pipe to be beat shall be uniformly heated to a temperature not exceeding 2100 F.
The temperature shall be determined by a surface thermocouple or by an optical pyrometer.
Bending s'hall bc completed between 1600 F aad 2100 F.
So bcndiag shall be performed at a temperature less than 1600 F.
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7.
Bending methods and controls shall bc such that the difference between the maximum aad minimum dfameter at any cross sectfon of the bend shall not exceed 8X of the average'measured outside diameter of the straight portion of the pipe.
8..
Buckling shall be kept to an absolute mfafmum cad shall not exceed the limits specified fn PFI Std ES-3 and outlined belav:
~ t a)
'Xhe maximum vertical height of any wave, measured from the average height of tMo ad)ofnfag crests to the valley, oha11 aot exceed M of the nominal pipe si"-e.
b)
'the mfafmum ratio of the distance between crests as compared to the hefght between crests aad the included valley shall be 12 to l.
c)
Buckles exceeding the limits defined in a) and b) above shall aot be repaired without approval of the Wansger of anality Assurance.
9.
%here surface checking is evident, it shall be removed by griadfng and the ground surface shall be examined usfag nn approved liquid penetrant procedure.
REVISION BY DATE APPROVED
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HOT SENDING OF hUSTENITIC SThINLESS STEEL PIPE PAGE OF DATE 3-26-74 SUPPLE~V 01 S. 0.
3301 thru 3304 Change Paragraph Ol to read:
1.
Hot bending is defined as forming at temperatures of 700 F and above.
Change Paragraph. f4 to read:
4.
The centerline radius of a bend shall not be less than five times the nominal pipe diameter.
Change Paragraph 07 to read:
7.
Sending methods and controls shall be such that the difference betveen the maximum and minimum diameter at any cross section of the bend shall not exceed 6'X of the average measured outside diameter of the straight portion of the pipe or tvo inches (2") vhichever is greater.
Change Paragraph 8 (a) to read:
8.
a)
The maximum vertical height of any eave, measured from the average height of tvo ad)oining crests to the valley, aha11 not exceed 3/8" in depth over a 12" length.
e hdd the folloving to the procedure:
~ t hll hot bends shall be solution annealed.
kpproved:
REVISlON 8Y DATE APPROVED 8'RI
Shearon Harris Nuclear Power Plant Draft SER Open Item No.
354 NRC Ouestion 210.62 Piping S ecification (CAR-SH-M-30, Rev. 16), Minimum Wall Thickness There are several places where minimal wall thickness is specified; e.g.,
II, 2.15 "weld end preparation
. does not encroach on the minimum wall of fittings II, 11.
"The wall thickness after machining or grinding shall not be less than the minimum wall thickness specified by the Pipe Code and/or Piping Line List."
Appendix A of the Specification, "Pipe Codes,"
does not identify any "minimum wall thickness" (or even a nominal wall thickness) and the Piping Line Lists (at least those furnished for Service Water, Unit 1) do not specify minimum wall thickness.
- However, our major concern is with:
II, 5.03 "In no case shall trimming of the inside diameter result in wall thickness less than the minimum required for the service conditions outlined in the Piping Line List of this specification."
As indicated by Ouestion PI 2, we have not found any indication of what corrosion/erosion allowance is used in evaluating the adequacy of piping.
- However, assuming that A
0.0625" for the line identified as "3SW8-87 SA" (8 inch nominal size, Sch.
80, nominal thickness of 0.500 inch, SA106 Grade B
material),
the "minimum required wall thickness for the service conditions" is either:
t 130 x 8 '25/(2(15000 + 52)) + 0.0625
~ 0.100 inch for "service condition" "maximum operating," or t
150 x 8.625/(2(15000
+ 60)) + 0.0625
~ 0.105 inch for "service condition" = "design".
Where is the cited minimum wall of II, 5.03 of the Specification used
- and, where used, what i-factor for girth butt welds is used?
RESPONSE
As stated in response to Ouestion No. 210.60, corrosion/erosion allowance was considered in determining the pipe wall thickness.
In reference to Appendix A of the M-30 Specification, Pipe Codes, note that the purpose of this section is to provide the pipe manufacturer with the acceptable material specification for pipes, fittings, bolts, nuts, etc.
The information in this Appendix has to be used in conjunction with the Ebasco Line List.
The Appendix A and the Line List are two complimentary documents and both documents have to be utilized in the pipe fabrication.
The wall (7876FXTccc)
I NRC Ouestion 210.62 (cont'd) thickness/schedule is provided in the Line List and there is no reason for indicating the wall thicknesses in the Appendix A, as well.
Under column "Pipe Code and Material" in the Line List, each line number is "assigned a
pipe code symbol (such as CS-1, SS-3, etc.),
which directs the fabricator to a specific material requirements per Appendix A of M-30 spec.
The term "Minimum Hall" as referred to in several places in the M-30 Specification reflects the minimum wall thickness required.
This minimum wall is based on the equations shown in ASME-III, NB/NC/ND"3641.1 and it includes the mill and corrosion/erosion tolerances.
The wall thickness/schedule shown in the Line List is a nominal wall thickness (except for a few heavy wall main steam and feedwater extruded pipes).
Pipe fabricator is required to furnish pipes with the wall thickness per the Line List.
The "minimum wall" is being used by the pipe manufacturer in the instances such as weld and preparation.
In this case, the acceptable machine I.D. is shown in the Piping Line List (See the Attachment).
The other instance where a reference to the minimum wall is made involved the shop "misfabrications."
These cases usually involve a violation of the nominal thickness shown in the Line List, and require Ebasco verification on case-by-case basis.
Ebasco would ensure that the violation is within the "design tolerance" (difference between the nominal wall thickness shown in the Line List and the minimum required wall per the code including corrosion/erosion allowance).
In summary, the nominal thickness/schedule shown in the Line List is a "binding" requirement for fabricating a spool piece.
All pipes delivered by the vendor have to comply with the Line List.
Regarding the comment on i-factor for girth butt welds, the intent of the question is not clear; i-factors for girth butt welds are specified in ASME-III, Figure NC/ND-3673.2(b)-1.
A question has been raised during the meeting with NRC on August 16, 1982, in
The NRC concern was reviewed with the pipe fabricator, Southwest Fabricating and Helding.
The comment is addressed by Southwest in the enclosed letter, dated August 17, 1983 (Item 1 and 2).
(7876FXTccc)
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SQUTHWEST FABRICAT'INQ 4 VJELDlNG CO., INC.
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august ly, 1ojt3 S-EB-748 Ebasco Services, Inc.
2 world Trade Center, 81st Floor NeM York, N 1004S Attcntfont Hr. Pete Ffala fteference:
Shearon Harris nuclear Po;.er Plant P.O. ÃY-435035 S.O. 3301-330'nd 4121-4124 Centlement In response to your telephone request ve offer the follovfng:
l.
QL;ESTION:
Boa do you assure that =ini~ Mall thickness is main-tafned at ccunterbored ends.
AÃS'ER
@nore ccunter bores are a requirement, the counter bere diameter, eall thickness and tolerances are specified on Scuth"est'c detaf1 sheets.
Prior to f%t up'fcr -aiding the pipe ends are counte b'ored to the specified dfmensfon and thi.k..css fs checked vfth a micrometer to verify Chat the thick'ness satisfies the spe ified re-quirement.
Since this check fs on'y to":eri'y that the thickness fs
- aoequate, actua'hick"esses are n.t recorded.
2.
'Q:ESTIONt L'hat tclerance applies at a counter bore
@hen Ebasco speci-fies a mfnf~ vallT AÃSiER:
M:en Ebasco speciffes a zfnfaum eall, the afnfmum thickness aLso applies to ccunter bored ends.
3.
O'L'ESTICZ:
ihat spec/!fcatfon bolting ass furnished by Southwest t A.".S"ERt Scut.-:;est furnisned
.he grace:f material spe iffed by basco...nt most.requently spec ffied js Sp- >. 37 studs "i ".. SA-1)-'
nuts iver pre5sure bol ndry 'oin s ~
5 -OI is t< e jra e c
~ on y speci fied f.
nachine bolts 'or ncnressure b:angary zpp-fcations.
752! sbrn'.sn st~set
~ >10. 0c~ 94<9
~ Houston. Texas 7725~-9449
('3) 928-34s1
- 7)vx. 910 Bst-16cc
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Kbasco Services.
Inc.
August 17, 1963 Page Tvo 4.
Q:KSTIOH:
Did Southvest specify ccrrosion yllcvance to the manufac-turers of veldolet type fittings~
A'.iYiK:
I do not believe corrosion a'l~ances "ere a part of the data furnished to Southvest.
If a corrosion allcvance vas specified, Southveat vould i pose the sa e requirement on aanu'facturers of special fit ings.
The vali thicknesses specified by Ebasco are included in the.
requirements imposed on our suppliers.
n I trust this vill satisfactoril>
ansver your questicns.
Call if I can be of further help.
ry truly yours,
- .n E. r.'arras ro)ect Nanager JXH
- cp bcc:
.3. J. Q.odvin
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1-snail'.
H. Noerke Ro Pe Scrn&$
S. N. Coodvin
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Shearon Harris Nuclear Power Plant Draft SER Open Item No.
354 NRC Ouestion 210.63 Pi ing Stress Analysis Data, References to Specification The Stress Analysis Data package (16 pages) appears to be a summary of the status of the design of the piping covered by Calculation No. 8050-1.
We have been unable to find any references to "Design Specification" CAR-SH-1f-30.
Why has the Design Specification seemingly been ignored in this package?
RESPONSE
Stress isometric lA-216-SW-1 lists under the reference documents "Design Spec CAR-SH-M-71" which is the design specification for Class 2,
3 and B31.1 piping.
That specification in turn lists Specification CAR-SH-M-30 in Paragraph 2 "Applicable Codes, Standards and Documents."
(7876FXTccc)
Shearon Harris Nuclear Power Plant Draft SER Open Item No.
354 NRC Question 210.64 Piping Stress Anal sis Data, ND-3640 Requirements We have not found any indication that the requirements of ND-3640 of Section III have been considered.
How is assurance obtained that the requirements of this important part of Section III have been met'P (A reply is expected that addresses assurance of adequate pressure design for all Section III piping; not just the piping covered by Calculation No. 8050-1.)
RESPONSE
As stated in reply to Question No. 210.59, Safety Class 2 and 3 piping has to be designed in accordance with the requirements of ASME-III, Subsection NC and ND, respectively.
It means that the specified wall thicknesses, branch connection
- designs, pipe bends etc., follow the requirements of the code.
Assurance of adequate pressure design is provided by means of instructions to the engineer responsible for design and specifications provided the pipe fabricator.
Instructions to the engineer include specific design criteria for use in the preparation of calculations.
In the case of pipe wall thickness determination, Ebasco Design Criteria MNE-65 for pipe line sizing applies, and a standardized worksheet (MNE-WS-16) is employed to document this calculation.
The design criteria is derived from code requirements and the worksheet provides a systematic approach in the determination of pipe wall thickness consistent with the requirements of the code.
SUPPLEMENTARY QUESTION IDENTIFIED DURING AUGUST 16 1983 MEETING WITH THE NRC MEB IN BETHESDA MD.
(Identified by E. Rodabaugh) 1.
How are field fabricator revisions controlled?
Field revisions and changes are governed by Company procedures and site specifications; specifically, Procedure No. 3.2, Design Change Control, and Site Specification No. 0.30, Field Fabrication and Erection of Power Piping.
(Copies Attached) 2.
What corrosion allowance is used by suppliers of fittings (weldolets, etc.)?
The corrosion allowance used by fitting suppliers is identical to that used in the determination of wall thicknesses specified in the Ebasco piping Line List.
The specified thicknesses are included in the requirements imposed by the pipe fabricator on his suppliers.
The determination of wall thickness and consideration for corrosion/erosion allowances are discussed in response to question MEB-210.60.
(7876FXTccc)
NRC Ouestion 210.64 (cont'd) 3.
How does the pipe fabricator design branch connections?
The pipe fabricator provides branch Ebasco piping specification.
Where fabricator does check reinforcement formulae provided in the applicable furnished in the Ebasco piping Line connections in accordance with the stub-in nozzles are permitted, the requirements in accordance with code using pressure and temperature List.
(7876FXTccc)
SYSTEM LINE DESIGNATION NO.
P DESIGN PRESSURE, PSIG T
DESIGN TEMPERATURE, F
~PIPE SPECIFICATION 8 GRADE E
ALLOWABLESTRESS, PSI D
OUTSIDE DIAMETER OF PIPE, IN.
C ALLOwANCE FOR MINIMUMSTRUCTURAL STABILITY y - COEFFICIENT m - MINIMUMPIPE WALLTHICKNESS, IN, (See NOTE 2) n ~ NOMINALWAI.L THICKNESS, IN. (See NOTE 3)
FIRST STANDARD SCHEDULE THICKNESS EQUAL TO OR GREATER THAN SCHEDULE (CORRESPONDING TO s )
SCHEDULE SELECTED ID INSIDE DIAMETER OF PIPE, IN, (See HOTE I)
C ALLOWANCE FOR MINIMUMSTRUCTURAL STABILITY y.- COEFFICIENT
- m ~ MINIMUMPIPE WALLTHICKNESS, IN ~
(See NOTE 2) tn ~ NOMINALWALLTHICKNESS, IN.
(See NOTE 3) s FIRST STANDARD SCHEDULE THICKNESS EQUAL TO OR GREATER THAN n SCHEDULE (CORRESPONDING TO s)
SCHEDULE SELECTED Px ID+ 2 SEC+ 2 PC + B 2 (SE t Py-P)
Use either of the following equations to determine tm:
BASED ON OUTSIDE DIAMETER BASED ON INSIDE DIAMETER fSee NOTE I)
PxD C
2 (SE+ Py)
C w Allowonce for minimum structural stability 00 0.065" for 1/2 to 3 1/2 inch nominal pipe Cise I
0.000 for 4 inch nominal pipe siss orid lorger SE= Maximum ollowobl~ stress in materiol due to internal pressure ond joint efliciency, at the design temperature, psi.
B 00.038 for pipe ordered to specified machined I.D. with topered backing ring ond extruded pipe specified by I.D. with topered backing ring.
00.000" for the above pipe with flot backing ring or other types of pipe with ony Design Guide M.4 bocking ring.
- y w A coefficient hoving volves as follows:
(See NOTE i)
TEMP. F Ferritic Steels Austenitic Steels 900 AND BELOW 0.4 0.4 950 0.5 004 1000 0.7 0.4 1000 0.7 0,4 1100 0.7 0.5 1150 AND ABOVE 0,7 0.7 NOTE 1 - Use maximrxrr possible inside d1'ometer with oil lrs toleronces on woll thrckness ond outside diomerers, except for pipe ordered ro specified machined I.D. and extruded pipe specified by I.D. where nore 8, paragraph 4, of Design Guide MHE45 governs.
HOTE 2 The prpe wolf thickness reqvned for o given pressure.remperorure cor7dfrlon increases os pipe slee rncreoses.
NOTE 3 ~ For seamless PlPe vse T)8)S l%%dr any slee ofPlore PiPe, odd OOIO inches to the colcvlored m ro obtain n.
r HOTEi The valve of "y may be interpolated between 50 F volues shown obove. For nonfenovs materials ond cost fran vse y x 0.4.
0 GENERAL HOTES: See Design Guide AINE-65 Pipe Line Slclng for specific ln%%drmation.
CLIENT ATION OJECT SY CNECtCED APPROVED Jee C71C1xC CX ISVXCXV0$0107 DATE DATE DATE STANDARDI2ED WORK SHEET PIP E WALLTHICKHESS AHD SCHEDULE DETERMIHATIOH WORK SHEET MN E-WS-16 EBASCO SERVICES INCORPORATED
)0IECHANICAL-NUCLEAR EHGIHEERING
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