ML18093A346

Informs of Progress & Schedule for Completion of Svc Water Sys Pipe Replacement Program at Units 1 & 2,per Insp Open Item 311/86-26-03.Piping Will Be Upgraded w/6% Molybdenum Stainless Steel Alloy by End of 1991

ML18093A346
Person / Time
Site:	Salem
Issue date:	09/01/1987
From:	Corbin McNeil Public Service Enterprise Group
To:	NRC OFFICE OF ADMINISTRATION & RESOURCES MANAGEMENT (ARM)
References
NLR-N87173, NUDOCS 8709100475
Download: ML18093A346 (6)

Text

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Public Service Electric and Gas Company Corbin A. McNeil!, Jr. Public Service Electric and Gas Company P.O. Box236, Hancocks Bridge, NJ 08038 609 339-4800 Senior Vice President -

Nuclear September 1, 1987 NLR-N87173 Document Control Desk

u. S. Nuclear Regulatory Commission Washington, D. C. 20555 Gentlemen:

SERVICE WATER SYSTEM PIPE REPLACEMENT SALEM GENERATING STATION UNIT NOS. 1 AND 2 DOCKET NOS. 50-272 AND 50-311 In response to NRC Inspection Open Item 311/86-26-03, Public Service Electric and Gas Company (PSE&G) provided information relative to the Service Water System (SWS) pipe replacement program that is underway at Salem Generating Station Units 1 and

2. The purpose of this letter is to apprise you of our progress to date and our projected schedule for completion of the program.

Based on the positive results of our tests on 6% Molybdenum Stainless Steel alloy materials and the fact that a similar material has been used successfully in SWS heat exchanger tubes at Salem for over 5 years, PSE&G has elected to undertake an extensive program to upgrade SWS piping and fittings with this material. The use of two such alloys (Avesta 254 SMO and Allegheny-Ludlum AL6XN) has recently been reviewed and approved by the American Society of Mechanical Engineers (ASME) for ASME Section III, Division 1, Class 2 and 3 construction. This approval is documented in Code Cases N-438, 439, 440, and 441 which are attached for your convenience. As these Code Cases deal with fabrication of materials and not relief from Code required testing or inspection, it is PSE&Gs understanding that specific Commission approval under 10 CFR 50.55a is not required.

Replacement of safety-related SWS piping will begin during Salem Unit No. 2 refueling outage which is presently scheduled for April 1988. Fabrication of material is underway and sufficient material will be available on-site in the near future to support any emergency replacements which may become necessary prior to the outage. Due to the extent of the replacements to be accomplished and the fact that the bulk of the work can only be accomplished during an extended outage condition, the replacement program is expected to continue through 1991, with major safety-related piping system replacements completed by the end of 1989.

Document Control Desk 2 9-1-87 Should you desire any additional information relative to this program, please feel free to contact us.

Sincerely, Attachments C Mr. D. c. Fischer USNRC Licensing Project Manager Mr. T. J. Kenny USNRC Senior Resident Inspector Mr. w. T. Russell, Administrator USNRC Region I Mr. D. M. Scott Bureau of Nuclear Engineering Department of Environmental Protection 380 Scotch Road Trenton, NJ 08628

CASES OF ASME BOILER AND PRESSURE VESSEL CODE

• CASE N-438 Approv.I Dete: Februery 23, 1987 See Numeric Index for expiration and any reaffirmation date11.

Case N-438 construction, provided the following requirements are Fe-24.5Ni-21Cr-6.5Mo*0.2N (Alloy UNS N08367) Seam* met.

less and Welded Pipe, Tube, Plate, Bar, Fittings, and (a) They meet the chemical analysis and minimum Forgings, Class 2 and 3 Construction - tensile requirements detailed in the Inquiry and specific-Section Ill, Division 1 ations.

( b) Heat treatment after forming is neither required nor prohibited .. If heat treatment is used, the solution.

lnquir_y: May solution annealed Fe-24.5Ni-21Cr-heat treatment shall consist of heating to a minimum of 6.5Mo-0.2N (Alloy UNS N08367) seamless and welded 2050°F and quenching in water or rapidly cooling by pipe, tube, plate, bar, fittings, and forgings with the other means.

chemical analysis shown in Table 1, the temper and (c) The maximum allowable stresses shall he those minimum mechanical properties shown in Table 2, and shown in Table 3.

otherwise conforming to SB-675, SB-676, SB-688, SB-(d) Welding Procedure Qualifications and perfor-690, SB-691, SB-366, SB-462, and SB-564 he used in mance qualifications shall he conducted as prescribed in Section III, Division l, Class 2 and 3 construction?

Section IX. The material shall he considered to he P-No.

45 .

Reply: It is the opinion of the Committee that solu- . (e) For external pre8sure design, use Fig. VIl-1106-1.

tion annealed Fe-24.5Ni-21Cr-6 ..5Mo-0.2N (Alloy UNS (f) All other requirements of Section ill, Division 1, N08367) seamless and welded pipe, tube, plate, bar, for Class 2 and 3 construction, as applicable shall he met.

fittings, and forgings may he used in welded or unwelded (g) This Case number shall he identified in the certi-construction under Section III, Division l, Class 2 and 3 fication for the material.

TABLE 1 CHEMICAL REQUIREMENTS Product (Check) Anelysis Variations, Compmition Under Minimum or Over Meximum Element Limits,% of th* Specified Limit of Element Carbon 0.03 max. 0.01 Manganese 2.00 max. 0.04 Silicon 1.00 max. 0.05 Phosphorous 0.040 max. 0.005 Sulfur 0.030 max. 0.005 Chromium 20.00-22.00 0.25 Nickel 23.50-25.50 0.20 Molybdenum 6.00-7.00 . 0.10 Nitrogen 0.18-0.25 O.Q1 Iron [Note (11] Balance NOTE:

(11 Shall be determined arithmetically by difference.

769 SUPP. 4-NC

CASES OF ASME BOILER AND PRESSURE VESSEL CODE

• CASE N-439 Approval Date: February 23, 1987 See Numeric Index for expiration and any reaffirmation dates.

Case N-439 TABLE 1 MAXIMUM ALLOWABLE STRESS VALUES Use of 20Cr-18Ni-6Mo (Alloy UNS S31254) Forgings, Plate, Seamless and Welded Pipe, and Welded Tube, Class For Metal Temperature Maximum Allowable Stress, ksi 2 and 3 Construction Not Exceeding, ° F Note 111 Notas I 1 l & 121 Section 111, Division 1 100 23.5 23.5 200 23.5 23.5 Inquiry: Under what rules may 20Cr-18Ni-6Mo (Alloy . 300 21.4 22.4 UNS S31254) forgings, plate, seamless and welded pipe,. 400 19.9 21.3 and welded tube be used for Section III, Division l, 500 18.5 20.5 600 17.9 20.1 Class 2 artd 3 construction? 650 17 .7 19.9 700 17.5 19.9 Reply: It is the opinion of the Committee that 20Cr- 750 17 .3 19.8 18Ni-6Mo (Alloy UNS S31254) may be used for Section NOTES:

III, Division l, Class 2 and 3 construction, provided the (1 l For welded pipe and tube, a factor of 0.85 shall be applied.

(2) At temperatures above 100°F, the allowable stress values requirements of (a) through (f) below are met. may exceed 62Y..% (62 1'3% for High Nickel Alloys) and may (a) Material shall conform to the requirements of the also reach 90% yield strength 10.2% offset) at temperature.

applicable product specification listed in Table 2. This may result in a permanent strain of as much as 0.1 %.

When this amount of deformation is not acceptable, the (b) This material shall be treated as P-No. 8, Group designer should reduce the design stress to obtain an*accept-No. 4. able deformation.

(c) The maximum allowable stress values shall be those shown in Table 1 of this Case.

(d) For external pressure design, use Fig. VII-1102-6 TABLE 2 PRODUCT SPECIFICATIONS of Section III, Division 1.

(e) All other requirements of Section III, Division 1, Forgings SA-182 for Oass 2 or 3 construction, as applicable, shall be met. Plate SA-240

(!) This Case number and revision applied shall be WeldP.d Tube SA-249 id.entified on the Material Manufacturer's certification Seamless & Welded Pipe SA-312 Welded Pipe SA-358 for the material.

771 SUPP.4- NC

__j

CASES OF ASME BOILER AND PRESSURE VESSEL CODE

• CASE N-440 Approval Date: February 23, 1987 See Numeric Index for expiration and any reaffirmation dates.

Case N-440 TABLE 1 CHEMICAL COMPOSITION,%

Use of 20Cr-18Ni-6Mo (Alloy UNS J93254) Castings, Class 2 and 3 Construction c = 0.025 max. Cr = 19.50 - 20.50 Section Ill, Division 1 Mn= 1.20 max. Ni = 17.50 -19.50 Si = 1.00 max. Mo= 6.00 - 7.00 p = 0.045 max. Cu = 0.50 - 1.00 Inquiry: Under what rules may 20Cr-18Ni-6Mo (Alloy s = 0.010 max. N = 0.180 - 0.240 UNS J93254) castings he used in Section III, Division 1, Oass 2 and 3 construction?

Reply: It is the opinion of the Committee that 20Cr-TABLE 2 MECHANICAL PROPERTIES 18Ni-6Mo (Alloy UNS J93254) may he used for Section III, Division l, Oass 2 and 3 construction provided the Tensile strength 80 ksi requirements of (a) through (f) below are met. Yield strength 38 ksi (a) Chemistry and mechanical properties shall con- Elongation 35%

form to the requirements of Tables 1 and 2 of this Case. Red. of area 35%

All other requirements of SA-351 shall be met.

(b) This material shall he treated as P-No. 8, Group No.4.

(c) The maximum allowable stress values shall he those shown in Table 3 of this Case. .

(d) For external pressure design, use Fig. VII-1102-6 of Section ill, Division 1.

(e) All other requirements of Section III, Division 1, for Oass 2 and 3 construction, as applicable, shall he met.

(/) This Case number shall he identified on the Material Manufacturer's certification for the material.

773 SUPP.4-NC

CASI N-441 CASES OF ASME BOILER AND PRESSURE VESSEL CODE *.. ;'

Approval D*te: Febru*rv 23, 1987 SH Numeric Index for expiration and any reaffirmation dates.

1_*....;,1 ~-* ...

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Case N-441 TABLE 1 MAXIMUM ALLOWABLE STREii VALUES Use of 20Cr-18Ni-6Mo (Alloy* UNS S31254) Fittings, Class 2 and 3 Construction For Met.I Temper*ture Maximum Allow*bl* Stress, ksi_

Section Ill, Division 1

• Not Exl*lding, °F Note 111 Not* 111 and (2) 100 20.0 20.0 Inquiry: Under what rules may 20Cr-18Ni*6Mo (Alloy 200 20.0 20.0

• UNS S31254) fittings with chemistry as listed in SA-290 300 18.5 19.0 be used in Section III, Division l, Class 2 and 3 construc- 400 17 .1 18.1 tion? 500 16.0 17.5 600 15.5 17.1 650 15.3 17.0 Reply: It is the opinion of the Committee that 20Cr- 700 15.1 16.9 18Ni-6Mo (Alloy UNS 531254) may be used for Section 750 14.9 16.9 rn. Division l, Oass 2 and 3 construction provided the requirements of (a) through (f) below are met. NOTES:

111 For weld fittings, a factor of 0.85 shall be qualified.

. (a) Chemi!'ltry and mechanical properties shall con- (2) At temperatures above 100°F, the allowable stress values fonn to the requirements of Alloy S31254 in SA-240. may exceed 62%% and may also reach 90% yield strength All other requirements of SA-403 shall be met. 10.2% offset) at temperature. This may result in a permanent strain of as much as 0.1 %. When this amount of deformation (b) This material shall be treated as P-No. 8, Group is not acceptable, the designer should reduce the design No.4. stress to obtain an acceptable deforma~ion.

(c) The maximum allowabie stress values shall be those shown in Table l of this Case.

(d) For external pressure design, use Fig. VII-1102-6 of Section III, Division l.

(e) All other requirements of Section III, Division l, for Oass 2 and 3 construction, as applicable, shall be met.

(!) This Case number and revision shall be identified on the Material Manufacturer's certification for the material.

775 SUPP. 4-NC