ML20069G965

Rev 1 to Catawba 1 & 2,Procedure for Selection of Type of Piping Branch Connection,Duke Classes B,C,E,F,G

ML20069G965
Person / Time
Site:	Catawba
Issue date:	08/19/1981
From:	DUKE POWER CO.
To:
Shared Package
ML20069G907	List: ML20069G905 ML20069G932 ML20069G965 ML20069H002
References
CNSA-DOC77-003, CNSA-DOC77-3, NUDOCS 8303280212
Download: ML20069G965 (16)

Text

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DUKE POWER COMPANY SPECIFICATION NO.: CNS-1206.00-02-108

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DESIGN ENGINEERING DEPARTMENT 2/20/75 WORKPLACE DOCUMENT CONTROL VISION 23 (5/28/81)

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USAGE AtRHORIZATION 89' I OI I6 O( .

QA CONDITION I

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Mechanical Nuclear

. DIVISION:

SECTION: - Analysis -

. EROUP: Catawba Stress Analysis TITLE: Catawba 1-2, Procedure for selection of type of piping branch connection.

Duke Classes B, C, E, F, G; CNSA-DOC 77-003 -

FDRMAT DESCRIPTION (i.e., bound or loose leaf, choice of Workplace Procedure, Manual, Handbook, or other): .

Workplace Procedure -

NUMBER OF SHEETS:

DESIGN ENGINEERING DEPARTMENT ~~

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PREPARED BY: b bA 8 bCM N DATE: 7-/7- 90 INSPECTED BY: A DATE: 7-/7-/d

. APPROVED: l DATEi 7-26-80 QUALITY ASSURANCE DEPAF!TMENT REVIEWED AND DESIGNATED QA CONDITION I 'BY: Me N- #

- - DATE: 7

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OA DATE PAGES REVISED _

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8303280212 830323 PDR ADOCK 05000

SPECIFICATI0tl it0.: CilS-1206.00-02-1002 ~

2/20/75

• REVISION 23(5/28/81).

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• h RECORD OF REVISIONS Rev. Issue Ppd. Ckd. App. Pages Revised and Description No. Date. by b9 by <

0 7-16-80 @ g ~715 Original Issue 1 8/19/81 77F3 OP gPd 3, 4, 6, 7, 12, Add 7A (Rev. as noted)

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CNSA-00C77-003 l

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2/20/75 REVISION 23 (5/28/81)

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PROCEDURE FOR THE SELECTION OF TYPE OF PIPING BRANCH CONNECTION DUKE CLASSES B, C, E F & G TABLE OF CONTENTS 1.0 Purpose of Procedure 2.0 . Scope o'f Procedure 3.0 Description of Procedure 4.0 List of Tables ,

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Table 2 Branch Type Description i Table 3.1 1/2" & 3/4" Branch Pipe Size Table 3.2 1" Branch Pipe Size

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Table 3.3 1 1/2" Branch Pipe Size Table 3.4 2" Branch Pipe Size 5.0 List of References o

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SPECIFICATI0fl fl0.: CNS-1206.00-02-1002

. 2/20/75

• REVISION 23 (5/28/81)

Page 4 of 16 1.0 PURPOSE OF PROCEDURE The purpose of this procedure is to provide a document to enable the piping designer to select the preferred type of .

piping branch connection. The tables are based on pressure reinforcement considerations only and.do not reflect any consideration cf mechanical piping loads from other sources'. ,

If the piping designer specifies a branch connection that does not meet this workplace procedure, it will be his responsibility to document by calculation the acceptability of that branch connection.

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2/20/75 REVISION 23 (s/28/81)

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2.0 SCOPE OF PROCEDURE

_ This procedure covers branch connections for all Duke Class B, CEF and G piping. The branch piping must intersect perpen-dicular to the run piping. The procedure is applicable for ASME

.B:1 PVC Section III, 1974, through Winter 1976 Addenda; ANSI B31.1, 1973, through Winter 1976 Addenda, ANSI B16.11, 1973; ASME B & PVC Section III, 1977, through Winter 1977 Add:nda, ANSI B31.1, 1977

• through Winter 1977 Addenda and ANSI B16.11,1977.

The results reflected in the tables are derived in Duke Power

. Company Stress Analysis Group Calculation DNK-3-28-77 (File O, no. nCC 1206.02-s4-000s).

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. CNSA-00C77-003 Page 2 of 12 '

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^^ SPECIFICATION NO.: CNS-1206.00-02k002

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• - 2/20/75 REVISION 23(5/28/81) 1 P. age 6 of 16 Q

3.0 DESCRIPTION

OF PROCEDURE '

l The attached tables give~ the types of branch connections based on pressure reinforcement considerations.

Table 1 lists the preferred branch types in tems of Duke Class, branch size and run size. This table also refers to Table 3 which gives further definition of 2 inch and smaller connections into 24 inch and larger run pipe.

Table 2 gives the description of the allowed branch connection types. ,

t In almost every case, an alternate branch connection is allowed.

The designer has the option of using the first alternate specified .

and may even use the alternate for the first alternate, and so on.

However, the designer is cautioned that the greater the variation from the preferred connection, the greater the chance that the connection may be overstressed, due to themal loads. Over- ,

' ~ tressed s connections (as determined by piping stress analysis)

. would require revision to the piping system. The cost of such a change would, of course, be dependent on the state of construction at the time the overstress condition was discovered. The designer must indicate on the construction drawing the option that the Construction Department is to construct. Variations to this option must then be requested through the Variation Notice procedure.

Note that ' area reinforcement must be_ verified on all " pipe to pipe" connections (connonly referred to as fabricated tees), and on almost all connections of branch pipes < 24" to run pipes >24".

Any questions regarding these tables should be directed to R. W. Bonsall, catawba Stress Analysis. l1

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SPECIFICATION NO.: CNS-1206.00-02-1002 2/20/75 REVISION 23,(5/28/81)

Paga 7 of 16 O 4.0 exCterIONS A. Large Temperature Changes at Fabricated Tee Connections 1 Experience has shown that reinforced fabricated tee

connections are highly stressed in the area of the pad-to-pipe weld joints when subjected to sudden and large changes .

in temperature. Cracking of these welds has occurred after being subjected to an undetennined number of cold-to-hot cycles resulting from steam being dumped into cold lines.

It is, therefore, reconinended that reinforced . fabricated tee connections not be located downstream within 20 diameters of pressure isolation valves where such valves are capable ,

of periodically suddenly releasing high temperature steam (approximately 500"F) into a nonna11y cold line.

, S. Past Procedures and Calculations i

Branch connections on the Catawba Nuclear Station sized prior I to March 28, 1977 were designed according to the 1974 edition h of the ASME B & PVC,Section III, Subparagraphs NC-3643.2(b),

! IB-3643.2(b), or ANSI B31.1-1973, Subparagraph 104.3.1, C.2 (Reference calculation: CNC-1206.00-02-1001) .. Branch connections sized cn or after March 28, 1977 but before July 16,1980, were designed to Stress Analysis Group Calculation DNK-3-28-77 (File MCC-1206-02-54-0005). All branch connections sized on or after July 16, 1980, shall be designed to this workplace procedure (CNSA-DOC 77-003).

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SPECIFICATION NO.: CNS-1206.00-02-1002 2/20/75 "

REVISION 23,* (5/28/81)

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TA8tE 1 BRANCH TYPE SELECTION BRANCH BRANCH CLASS SIZE RUN TYPE

. - s 2" d 2" sur B.C.E.F&G $ 2" 2) - 36" See Table #3 *

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SPECIFICATION NO.: CNS-1206.00-02-1002 2/20/75 REVISION 23,(5/28/81)

P. age 9 of 16 e

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TABLE 2 BRANCH TYPE DESCRIPTION e

SWT Forged steel socket welding tee per ANSI E16.11. No alternate permitted except by the Stress Analyst.

BWT -

Factory made wrought butt-welding tee per f 3SI B16.9. BWT-R may be used as an alternate. See Note 3.

BWT-R Factory made wrought butt-welding tee per ANSI B16.9 and a single butt-welding reducer per ANSI B16.9. BWSW may be used as an alternate. See Note 3.

SWSW Forged butt-welding Sweepolet (Source Fitting). See Note 4.

BWW may be used as alternate. See Note 8 for limitations.

k Forged socket welding half coupling per ANSI B16.11 shaped to header 0.D. and beveled for ft.11 penetration weld. SPWB may

• be used as an alternate provided wall thickness of run pipe is g- 2. 5 inches and run pipe ncminal size is 1 8 inches. See Note 2 and Note 10. l1 3HC - 3000# half coupling -

6HC - 6000# half coupling SPWB Forged special welding boss as detailed on MDG-ES-2 and MG-ES-3. BWSO may be used as an alternate. See Note 7.

BWSO Forged butt-welding Sockolet (or Thredolet as applicable)

(Source Fittings). See Note 5.

BWW Forged butt-welding Weldolet (Source Fitting). See Note 6.

FT may be used as an alternate. '

See Note 8 for limitations.

l FT Fabricated Tee (pipe-to-pipe corner joint). See Note 1 and Note 9. l1

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NOTES ,

(1) Branch to header size ratio and reinforcement calcu-lations per (a) Fig. NC-3673.2(b)-1 and NC-3643 for Class B, (b) Fig. ND-3673.2(b)-1 and ND-3643 for Q( Class C, and (c) Figure D-1 and Paragraph 104.3 for Classes E. F, and G must he performed for all sizes.

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. . SPECIFICATI0fl NO.: CNS-1206.00-02-1002 2/20/75 REVISI0ft23,(5/28/81)

P. age 10 of 16

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O (2) See Detail "R" on Drawing MC-1676-1.1, CN-1676-1.1, and P81-1676-1.1.

(3) The branch to header size ratio will be limited to the availability of fittings as listed in manufac- e turers' catalogs.

(4) Sweeoolets will be used where the fitting sizes are not available and/or in situations where two header welds may be overcome by such design. For limitations of branch-to-run size ratio, see ' manufacturers' catalog. See Detail "AA" on Drawing MC-1676-1.2 CN-1676-1.1, and P81-1676-1.1.

(5) See Detail "Y" on Drawing MC-1676-1.2. CN-1676-1.1 and P81-1676-1.1.

(6) See Detail "Z" on Drawing MC-1676-1.2, CN-1676-1.1 and P81-1676-1.1.

(7) See Detail "X" on Drawing MC-1676-1.2. CN-1676-1.1 and P81-1676-1.1. .

(8) For Class B, the use of BW and FT is limited to Q -

branch sizes $ 4". -

~(9) Fabricated tees requiring reinforcement, either for Stress Analysis Group's reduction of Stress Intensification 3 Factors and/or Power Piping's qualification of nozzle welds for pressure stress, shall be sized using the following criteria:

t, = thickness of reinforcing pad t = nominal wall thickness of run pipe t, = 1.5 t The width (w) of the pad should be the greater of:

a. The width of the pad sized for pressure reinforcement by the Power Piping Section.

b. One half the nominal cutside diameter of the branch pipe but not to be less than 1" or greater than 6".

This criteria should be used on nozzle welds that require reinforcing pads, effective January 21, 1981. .

(Ref. letter: CN-SA-81-0035) 4 CMSA-DOC 77-003 Page 7 of 12

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'SPEblFICATION NO. : CNS-1206.00-02-1002 2/20/75

~ REVISION 23 (5/28/31)

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(10) Thermowells used on Catawba were designed to fit 3000 lb.

half-couplings. By using the branch selection chart to size the thermowell connection, a 3000'1b. half-coupling may be acceptable for run piping with a thin wall, but a 6000 lb. half-coupling would be required for run piping with a wall thickness over a certain schedule. Since the branch selection chart is designed for typical branch connections, with branch connections being defined as branch 3 pipe intersecting with run piping, it is preferred that the thermowell connections be sized using 3000 lb. half-couplings with a separate calculation to qualify the connection. The thermowell connections may be sized according to the branch selection chart, but this should be used as an alternate method. If a 6000 lb. hal.f-coupling is used,-the internal diameter of the coupling must be bored to the same diameter of a 3000 lb. half-coupling to allow for thermocouple

- installation. The only difference between the two half-couplings would be the outside diameter. (Ref. letter: CN-SA-81-0211) ,

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_m IFICATION NO.: CNS-1206.00-02-1002

/75 .

. REVISION 23,-(5/28/81) , ,

TABLE 3.IPage 12 of 16 1/2" ANO 3/4" 8 RANCH PIPE SIZE '

RUN PIPE SCHEOULE AUN PIPE 1 SIZE I.0 20 30 40 60 80 140 160 Xs 100 l 120 STO .

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SPECIAL "

DESICN 22 24 ,

i 26 l Non-standard sized 28 611C pipe. Reinforcement verification required 30 for all branch connec-l tions. '

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l HOTE: SEE TABLE 2 FOR BRANCH TYPE DESCRIPTION , ,

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SPECIFICATION NQ.: CNS-1206.00-02-1002 .

• 2/20/75 REVISION 23,(5/28/81) .

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i TA8LE 3.2 I" BRANCH PIPE SIZE RUN PIPE SCllEDULE RUN PIPE .

SIZE l'o 20 30 40 60 80 100 120 140 160 xS 570

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3g g ,

3HC '

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6nC 12

'3HC 14

, 6HC 16 33 SM -

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• DESIGN l 26

! Non-standard' sized pipe.

28 6HC Reinforcement verifi-cation required for all l 30 branch connections, , ,

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l 36 NOTE: 5EE TABLE 2 FoR,8RANCll TYPE DESCRIPTION

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SPECIFICATION NO.: CilS-1206.00-02-1002 {

2/20/75  !

. REVISI0tl23,.(5/28/81) 3

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Page 14 of 16 j TA8LE 3.3 1 33" BRANCH PIPE- SIZE RUNPl[E RUN PIPE SCHEDUI.E 10 20 30 40 60 80 100 120

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. 6HC 8

. 6HC 3HC 10 '

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6HC 34 ,

. SPWs 16 - -

18 g39 3HC to .

or SPECIAL 22 .

DESIGN 24 .

26 Non-standard sized pipe. Reinforcement i

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verification required 30 6HC for all branch con-nections. '

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NOTE:

,SEE TABLE 2 FOR BRANCH TYPE DES,CRIPTION Ot

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2/20/75 REVISION 23,'(5/28/81)

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TA8LE 3.4

, P' SSNCH PIPE SIZE *

, ,,, RUN PIPE SCHEDULE '

SIZE 10 20 40 30 60 80 100 120 14 0 160 XS STO 21 .

3 i E 31 -

3HC 3HC .

5 1

8 l 10 O

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14 6HC SPWB 16 18 -

l 20 6HC .

22 8WSW

_ or 24 SPECIAL DESIGN 26 Non-standard sized i 28 PI Pe. Reinforcemen t -

l 6HC verification re spi, ed 30 for all branch con-nections. .- *

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. SPECIFICATI0ft ?!0.: CilS-1206.00-02-1002 .

2/20/75 l REVISION 23,(5/28/81) 1 Page~ 16 of 16 i 1

5.0 LIST OF REFERENCES

1. ASME B & PVC,Section III, 1974 Through Winter 1976 Addenda.

. 2. ANSI B31.1, 1973, Through Winter 1976 Addenda.

3. ANSI B16.11, 1973 , *

4. Duke Power Co. Stress Analysis Group Calculation DNK-3-28-77.

5. ASME B & PVC,Section III,1977, through Winter 1477 addenda.

6. ANSI B31.1, 1977, through Winter 1977 Addenda. ,

7. ANSI B16.11, 1977.

. 8. Letter to R. L. Williams from W. R. Selden, dated January 21,1981 (CN-SA-81-0035).

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9. Letter to R. L. Williams from W. R. Selden, dated March 4, 1981 (CN-SA-81-0211).

10. Half coupling branch connection calculation CNC-1206.00-02-1001.

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