ML17059B562

Rev 1 to Ssflaw Overlay Size

ML17059B562
Person / Time
Site:	Nine Mile Point
Issue date:	05/16/1997
From:	Trench R MPR ASSOCIATES, INC.
To:
Shared Package
ML17059B563	List: ML17059B562 ML17059B568 ML18040A261
References
085-295-02, 085-295-02-R01, 85-295-2, 85-295-2-R1, S14-33M009, S14-33M9, NUDOCS 9705280089
Download: ML17059B562 (28)

Text

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320 King Street Alexandria, VA 22314 CALCULATIONTITLE PAGE Client Project Title Niagara Mohawk Power Corporation NMP-1 RWCU Weld 33-FW-22 Overlay Design SSFLAW Overlay Size Page1of8

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085-9708-295-0 Calculation No.

085-295-02 Preparer/Date Checker/Date Reviewer/Date Rev. No.

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~(r.(q7 QUALITYASSURANCE DOCUMENT his document has been prepared, checked, and reviewed in accordance with the Quality Assurance requirements of 10CFR50 Appendix B, as specified in the MPR Quality Assurance Manual.

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RECORD OF REVISIONS Calcuiation No.

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CONTENTS Section 1.0 2.0 PURPOSE

SUMMARY

OF RESULTS

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3.0 APPROACH 4.0 CALCULATION 5.0 OVERLAYLENGTHCALCULATION 6.0 ATI'ACHMENTS 1

SSFLAW Program Output 2

Examination Report for Weld 33-FW-22 dated 5/15/97

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1.0 PURPOSE The purpose of this calculation is to determine the thickness of an overlay to be installed at the location ofWeld 33-FW-22 in the NMP-1 RWCU piping system.

2.0

SUMMARY

The overlay size is:

Thickness:

Length:

0.25-inch minimum 25-inch minimum, centered on the nozzle side edge of the weld crown 3.0 APPROACH In 1988 NMPC obtained computer program SSFLAW, which calculates overlay sizes using the method presented in Reference 1. Reference 2 describes the program, its development, and use, and provides a user manual for the program.

The program performs the followingoperations:

SSFLAW assumes the crack extends 360 degrees around the pipe and penetrates fullythrough the original pipe walL The crack is assumed to stop at the overlay.

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SSFLAW then uses the stresses applied to the section to determine the overlay thickness needed to prevent plastic collapse of the section, including a factor ofsafety of 2.77 as required by NUREG-0313, Revision 2.

4.0 CALCULATION 4.1 Pro m SSFLAWIn uts Appendix Ato the SSFLAW user's manual (Reference 2) describes the inputs required to run the program. The required inputs for overlay sizing are listed below, along with the values to be used in the pI'ograIn.

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e i t

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. SSFLAWdefaultvalues for these parameters are used. The program calculates these parameters forType 304 material at the input temperature of the system (discussed below).

0 eratin Tem erature. Per Reference 3, the design nozzle temperature is 575'F.

Pressure.

Per Reference 3, the design pressure ofthe nozzle is 1300 psig.

Pi e Outside Diameter and Wall Thickness.

Per Reference 3, the weld is in nominal 6-inch piping (6.625-inch actual OD) with 0.38-inch minimum wall thickness.

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A lied Stresses.

Stresses are calculated in Reference 4 as follows:

Applied Tensile Stress; Applied Bending Stress:

0.4 ksi 12.0 ksi Note that the above stresses include secondary stresses due to thermal expansion.

Treating thermal stresses as primary stresses is required by NUREG-0313, Revision 2 for overlays fabricated from SMAWweld metal. Per the SSFLAW user manual, pressure stress is calculated separately by the program and so is not to be included in the input stresses.

Note that the followingparameters are speciQed for input into Program SSFLAW but are not needed for the overlay sizing calculation method:

'eld Type Residual Stress State Haw Orientation, Length and Depth Service Interval Reference Source forAllowable Haw Size Therefore, for Program SSFLAW runs made in this calculation, the input values for these parameters are selected as default values.

Pro m SSFLAW Results presents the printout from Program SSFLAW run for the above inputs. The results show that an overlay thickness of0.25-inch minimum is acceptable for the applied stresses.

Program SSFLAW was developed and used in accordance with the MPR Associates Quality Assurance Program.

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320 King Street Alexandria, VA 22314 Calculation No.

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5.0 OVERLAYLENGTHCALCULATION Code Case N-504 (Reference 5) provides the foHowinginstruction for determining the length of the overlay required beyond each edge of the observed flaws:

Length

= 0.75

( R

)

( t )

where R = outer radius and t = nominal wall thickness ofpipe.

Accordingly, the required overlay length beyond each end of the observed flaws for this 6-inch OD, schedule 80 pipe is:

Length

= 0.75 (6. 625" / 2) (0. 432")

= 0. 9" Per Reference 6 (Attachment 2), the observed length of the indication is 0531-inch (equal to 7/16-inch plus 3/32-inch). The required length is then:

0.531" + 2 (0.9") = 2.33" Use 2.5-inch minimum length centered on the nozzle side edge ofthe weld crown.

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Calculation No.

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5.0 REFERENCES

"Evaluation ofFlaws in Austenitic Steel Piping," Section XITask Group forPiping Flaw Evaluation (ASME Code), Journal OfPressure Vessel Technology, Volume 108, No. 3, August 1986.

2.

MPR Report MPR-1037, Revision 1, "SSFLAW AComputer Program to Evaluate Cracks in Stainless Steel Piping (Version 1.1)," April1988.

3.

Southwestern Engineering Company Drawing 77528, Rev. 17, "Regenerative Clean-up Heat 4

Exchanger" (forRWCU HXND-03).

4.

MPR Calculation 085-295-01, "NMP-1 RWCU Weld 33-FW-22 Overlay Design, Stresses for Input to Program SSFLAW," Revision 0.

5.

ASMEBoilerAnd Pressure Vessel Code Case N-504, dated April30, 1992.

6.

NMPC Radiographic Examination Report forWeld 33-FW-22 dated 5/15/97. Pncluded as I.]

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ATTACHMENT1 SSFLAW Program Output

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SSFLAW Version 1.1 (April 5, 1988)

ATI'ACHMENT OF Overlay Sizing Calculation Results 33-FW-22 Weld Overlay Sizing Date: 5/16/97 Pipe Material: Type 304 Stainless Steel Sm= 16.67 ksi Sy= 18.50 ksi Pipe Geometry:

Outside Diameter=

Wall Thickness=

6.625 in 0.380 in System Operating Conditions:

Pressure=

1300.0 psig Temperature=

575.0 F

Tensile Stress (ksi)

Bending Stress (ksi)

Pressure Stress (ksi)

Normal Conditions 0.40 12.00 5.02 Faulted Conditions 0.40 12.00 5.02 Required Weld Overlay Dimensions:

Overla Thickness=

0.233 in verlay Length=

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320 King Street Alexandria, VA 22314 Calculation No.

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ATTACHMENT2 Radiographic Examination Report forWeld 33-FiV-22 dated 5/15/97

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