ML20085J680

Rev 0 to Engineering Spec JSN-T35, Seat Testing & Disc Hydrostatic Testing - 5 Minute Duration

ML20085J680
Person / Time
Site:	Harris
Issue date:	01/24/1978
From:	JAMESBURY CORP.
To:
Shared Package
ML18018A805	List: ML18018A803 ML18018A808 ML18018A809 ML18018A810 ML18018A811 ML18018A812 ML18018A813 ML18018A814 ML18018A815 ML18018A817 ML18018A818 ML18018A819 ML18018A820 ML18018A821 ML18018A822 ML18018A823 ML20085J680
References
JSN-T35, NUDOCS 8310130282
Download: ML20085J680 (11)

Text

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Shearon Harris Nuclear Power Plant Draft SER Open Item No. 354 NRC Ouestion 210.60 Piping Specification (CAR-SH-M-30, Rev. 16), Corrosion and Erosion Allowances Where are corrosion / erosion allowances specified? If not specified, how are the requirements of NB/NC/ND-3640 evaluated?

RESPONSE

The corrosion or erosion allowances for calculating the piping minimum wall thickness are currently not specified in the Ebasco Specification CAR-SH-M-30, General Power Piping.

However, an additional thickness to provide for corrosion or erosion was considered and is included in the wall thicknesses / schedules specified in the Ebasco Line List.

As stated in ASME-III, subsections NB/NC/ND-3640, the corrosion and erosion vary widely from installation to installation. While there are no code recommendations for a " specific corrosion / erosion thickness," allowances of 0.080" to 0.150" for carbon steel and 0.0025" for stainless steel materials is considered throughout the industry as an " adequate tolerance."

The pipe wall thicknesses / schedules specified on Shearon Harris Project are based on the ecuations specified in ASME-III, NB/NC/ND-3641.1. After considering the mill tolerances (12 1/2% for seamless pipes and 0.010" for the plate pipes), and additional thickness of 0.080" to 0.150" for CS pipes and 0.0025" for SS pipes is considered for corrosion / erosion.

It is noted that the corrosion / erosion allowance used on the Shearon Harris l

Project is not unique for each piping system, material grade, pipe size or water chemistry. Rather, a generic allowance (in the range of 0.C80" to 0.150" for CS and 0.0025" for SS) is added to the calculated minimum wall.

This is generally accomplished by selection of a commercially available wall thickness / schedule which exceeds the minimum calculated wall thickness by 0.080" to 0.150" (for CS pipes) or 0.0025" (for SS pipes).

l

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I We shall revise the M-30 specification to indicate that the wall thickness / schedule specified in the Ebasco Line List includes the tolerance for corrosion / erosion.

l l

During the August 16, 1983, meeting with NRC in Bethesda, MD, a question has i

been raised regarding the "adecuacy" of minimum pipe wall for the 48" Service i

Water lines (7SW48-312 and 7SW48-313).

l Our further evaluation revealed the following:

l Min. wall calculation per Code equation assumes the weld joint efficiency l

equal to 1.

This is justified by use of a plate pipe with 100%

l radiography (ASTM A-155 KC 65, Class 1).

l (7876FXTecc) l

NRC Ouestion 210.60 (cont'd)

Considering 0.140" corrosion / erosion allowance (the established range is 0.080" to 0.150") and 0.010" mill tolerance, the min. required wall is 0.371".

The selected wall is 0.375".

We are enclosing a copy of our calculations pertaining to these Service Water Lines.

In general, the piping systems constructed from a carbon steel plate material, assume a weld joint efficiency equal to 1.

This is based on the fact that the specified material specifications do require 100% radiograph examination.

Refer to the individual pipe codes in Appendix A of Specification CAR-SH-N-30.

As stated above, the Ebasco specified pipe wall thicknesses do meet the Code requirements.

(7876FXTecc)

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SCHEDULE (ColHtESPONDING TO 's) l SCHEDULE SELECTED Use either of the following equations to determine 'm :

B ASED ON OUT51DE DI AMETER B ASED ON IN5IDE DI AMETER (See NOTE 1) e,,

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l B =.038" for pipe ordered to specified machined 1.D. with tapered backing ring and entruded pipe specified j

by I.D. with tapered backing ring.

=.000* for the ebeve pipe with flat backing ring er other types of pipe with ony Design Guide M.4 backing ring.

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= A coef ficient hoving eelues es follows: (See NOTE dl TEMP.F 900 AND.BELow 950 1000 1050 1100 1150 AND AB0VE Foritic Steels 0.4 0.5 0.7 0.7 0.7 0.7 Austenitic Steels 0.4 0.4 0.4 0.4 0.5 0.7 NOTE 1 Use meeseson pensible inside doe seter wirk ell its selerances en well rkickness and outside dron.orers, eucept Ier pipe ordered se specified machined I.D. end eueruded pipe specn!.e4 by I.D. wisere nere 8. peresraph 4. elDesign Guide MNE.65 severns.

NOTE 2. The p pe well ekockness renu red for e given pressure-remperature cond

• ion increeses es pipe sine increases.

NOTE 3 For seenless pope use & :for eny nine elplere pipe. edd 0.010 inches to the celculered 'm se obreen en.

NOTE 4. The eelue of *y* mer be erwerpolared between 50 F eelues shown above. For nonferrous meteriels est cear inen sne y e C.A.

GENERAL NOTES: See Design Guide MNE.65 Pipe Line Sicing for specific intermerien.

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C LIE NT STANDARDIZED work SHEET

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gTATioW PIPE WALL THICKNESS AND MA/PP SCHEDULE DETERMINATION em oerCT CY

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EBASCO interoffice Correspondence DATE August 18, 1983 FILE REF.

To F. Heyden OFFICE LOCATION 87/2WIC FROM C. McCaul

[

OFFICE LOCATION 88/2WTC SUBJECT SHEARON HARRIS SERVICE WATER PIPING - CORROSION ALLOWANCE I have reviewed the information you provided concerning water chemistry,and coatings to be provided for the subject piping.

Corrosion allowance depends on a number of factors including water chemistry, temperature, velocity, etc.

In this case, calculation of corrosion allowance is complicated by the initial presence of a protective coating. I presu=e the coating will not be maintained, otherwise there would not be a need for any corrosion allowance.

J. Firtel, Ebasco coatings expert, informed me that the specified coatings Plasite 1000 primer and Plasite 7122 topcoat, could be expected to deteriorate 25% in five years.

There are a number of indices one may use to calculate, from water chemistry parameters, approximate corrosivity of a specific water. Based on the Langelier Index, the Shearon Harris service water is relatively corrosive.

Corrosion rate for most soft (that is to say - corrosive) fresh waters falls in the range 0.002-0.006 in/yr. An average corrosion rate of 0.004 in/yr could reasonably be assumed for the Shearon Harris water. Based on a 40 year service life and deterioration of the initial coating as discussed above, about 0.140 inch averate wall thickness loss could be expected over the life of the piping.

meC:jl cci J. Firtel

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Shearon Harris Nuclear Power Plant Draft SER Open item No. 354 NRC Ouestion 210.61 Piping Specification (CAR-SH-M-30, Rev. 16), Out-of-Roundness In 12.01a and 12.02a, there is a recuirenent:

"The degree of out-of-roundness shall be' such that there will be no decrease in flexibility or increase in stress over the allowable stress for the design conditions."

(a) How is assurance obtained that this reouirement is met?

(b) Is an increase in flexibility permitted?

(c) What is the " allowable stress for the design conditions"?

RESPONSE

(a) The tolerances specified for bends in Paragraphs 12.01a and 12.02a in Part Two of Specification CAR-SH-M-30 are incorporated in Southwest's bending procedures and the bends furnished by Southwest are checked for compliance with the applicable procedure. The bending procedures which have been approved for use on the Shearon Harris Project are:

PROCEDURE NO.

REVISION SUPPLEMENT 4-106 0

1 4-107 0

1 4-108 0

1 4-109 0

1 A copy of the above listed procedures is enclosed for your convenient reference.

(b) An increase in flexibility is not permitted.

(c)

"The allowable stresses for the design conditions" are the stresses from ASME III, Appendix I for a specific pipe material grade and corresponding temperature specified in the Ebasco Line List.

Paragraphs 12.01a and 12.02a will be revised as follows:

crocs section without buckling or undue stretching of pipe wall. Out-of-roundness at pipe bends shall not exceed 6 percent In addition, Westinghouse will be advised about the 6% out-of-roundness allowed in Southwest Fabricating pipe bends.

(7876FXTecc)

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