ML17059B562

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Rev 1 to Ssflaw Overlay Size.
ML17059B562
Person / Time
Site: Nine Mile Point Constellation icon.png
Issue date: 05/16/1997
From: Trench R
MPR ASSOCIATES, INC.
To:
Shared Package
ML17059B563 List:
References
085-295-02, 085-295-02-R01, 85-295-2, 85-295-2-R1, S14-33M009, S14-33M9, NUDOCS 9705280089
Download: ML17059B562 (28)
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Text

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ILIMPR 320 King Street Alexandria, VA 22314 CALCULATIONTITLE PAGE Client Niagara Mohawk Power Corporation Page1of8

+ r4~u~avm Project Task No.

NMP-1 RWCU Weld 33-FW-22 Overlay Design 085-9708-295-0 Title Calculation No.

SSFLAW Overlay Size 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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lilMPR 320 Nng Street Alexandria, VA 22314 RECORD OF REVISIONS Calcuiation No.

085-2952 Revision c i~

Prepared By Description Checked By Page 2 Initial Issue Changed title of Attachment 1.

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320 King Street Alexandria, VA 22314 Calculation No. Prepared By Page 3 085-295-02 CONTENTS Section .~Pa e 1.0 PURPOSE 2.0

SUMMARY

OF RESULTS 3.0 APPROACH 4.0 CALCULATION 5.0 OVERLAYLENGTH CALCULATION 6.0 ATI'ACHMENTS 1 SSFLAW Program Output 2 Examination Report for Weld 33-FW-22 dated 5/15/97

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r~~MX R 320 King Street Alexandria, VA 22314 Calculation No. Prepared By Page 4 085-295-02 1.0 PURPOSE The purpose of this calculation is to determine the thickness of an overlay to be installed at the location of Weld 33-FW-22 in the NMP-1 RWCU piping system.

2.0

SUMMARY

The overlay size is:

Thickness: 0.25-inch minimum Length: 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 following operations:

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

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lXLMPR 320 King Street Alexandria, VA 22314 Calculation No. Prepared By Checked By Page 5 085-295-02 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 of safety of 2.77 as required by NUREG-0313, Revision 2.

4.0 CALCULATION 4.1 Pro m SSFLAWIn uts Appendix A to 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 e i t Int n i n d n h . SSFLAWdefaultvalues for these parameters are used. The program calculates these parameters for Type 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 of the 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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/LIMPR 320 King Street Alexandria, VA 22314 Calculation No. Prepared By Page 6 085-295-02 A lied Stresses. Stresses are calculated in Reference 4 as follows:

Applied Tensile Stress; 0.4 ksi Applied Bending Stress: 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 SMAW weld 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 following parameters 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 for Allowable 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 Attachment 1 presents the printout from Program SSFLAW run for the above inputs. The results show that an overlay thickness of 0.25-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. Prepared By Checked By Page 7 085-29542 5.0 OVERLAYLENGTH CALCULATION Code Case N-504 (Reference 5) provides the foHowing instruction 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 of pipe.

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 of the weld crown.

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tsiMPR 320 King Street Alexandria, VA 22314 Calculation No. Prepared By Checked By 085-295-02 6- Page 8

5.0 REFERENCES

"Evaluation of Flaws in Austenitic Steel Piping," Section XITask Group for Piping Flaw Evaluation (ASME Code), Journal Of Pressure Vessel Technology, Volume 108, No. 3, August 1986.

2. MPR Report MPR-1037, Revision 1, "SSFLAW A Computer Program to Evaluate Cracks in Stainless Steel Piping (Version 1.1)," April 1988.
3. Southwestern Engineering Company Drawing 77528, Rev. 17, "Regenerative Clean-up Heat 4

Exchanger" (for RWCU HX ND-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. ASME Boiler And Pressure Vessel Code Case N-504, dated April 30, 1992.
6. NMPC Radiographic Examination Report for Weld 33-FW-22 dated 5/15/97. Pncluded as I

Attachment 2.]

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ra1MPR 320 King Street Alexandria, VA 22314 Calculation No. Prepared By Checked By 085-295-02 M cs~ Page 1 ATTACHMENT1 SSFLAW Program Output

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ATI'ACHMENT SSFLAW Of t$ Version 1.1 OF (April 5, 1988)

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: System Operating Conditions:

Outside Diameter= 6.625 in Pressure= 1300.0 psig Wall Thickness= 0.380 in Temperature= 575.0 F Normal Conditions Faulted Conditions Tensile Stress (ksi) 0.40 0.40 Bending Stress (ksi) 12.00 12.00 Pressure Stress (ksi) 5.02 5.02 Required Weld Overlay Dimensions:

Overla Thickness= 0.233 in verlay Length= 1.

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WMPR 320 King Street Alexandria, VA 22314 Calculation No. Prepared By Checked By Page 1 085-295-02 ATTACHMENT2 Radiographic Examination Report for Weld 33-FiV-22 dated 5/15/97

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