ML18093A346
| 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
I I
Public Service Electric and Gas Company Corbin A. McNeil!, Jr.
Senior Vice President -
Nuclear Public Service Electric and Gas Company P.O. Box236, Hancocks Bridge, NJ 08038 609 339-4800 September 1, 1987 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 NLR-N87173 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
CASE N-438 CASES OF ASME BOILER AND PRESSURE VESSEL CODE Approv.I Dete: Februery 23, 1987 See Numeric Index for expiration and any reaffirmation date11.
Case N-438 Fe-24.5Ni-21Cr-6.5Mo*0.2N (Alloy UNS N08367) Seam*
less and Welded Pipe, Tube, Plate, Bar, Fittings, and Forgings, Class 2 and 3 Construction Section Ill, Division 1 lnquir_y:
May solution annealed Fe-24.5Ni-21Cr-6.5Mo-0.2N (Alloy UNS N08367) seamless and welded pipe, tube, plate, bar, fittings, and forgings with the chemical analysis shown in Table 1, the temper and minimum mechanical properties shown in Table 2, and otherwise conforming to SB-675, SB-676, SB-688, SB-690, SB-691, SB-366, SB-462, and SB-564 he used in Section III, Division l, Class 2 and 3 construction?
Reply: It is the opinion of the Committee that solu-tion annealed Fe-24.5Ni-21Cr-6.. 5Mo-0.2N (Alloy UNS N08367) seamless and welded pipe, tube, plate, bar, fittings, and forgings may he used in welded or unwelded construction under Section III, Division l, Class 2 and 3 construction, provided the following requirements are met.
(a) They meet the chemical analysis and minimum
- tensile requirements detailed in the Inquiry and specific-ations.
( b) Heat treatment after forming is neither required nor prohibited.. If heat treatment is used, the solution.
heat treatment shall consist of heating to a minimum of 2050°F and quenching in water or rapidly cooling by other means.
(c) The maximum allowable stresses shall he those shown in Table 3.
(d) Welding Procedure Qualifications and perfor-mance qualifications shall he conducted as prescribed in Section IX. The material shall he considered to he P-No.
45.
. (e) For external pre8sure design, use Fig. VIl-1106-1.
(f) All other requirements of Section ill, Division 1, for Class 2 and 3 construction, as applicable shall he met.
(g) This Case number shall he identified in the certi-fication for the material.
TABLE 1 CHEMICAL REQUIREMENTS Element Carbon Manganese Silicon Phosphorous Sulfur Chromium Nickel Molybdenum Nitrogen Iron [Note (11]
NOTE:
Compmition Limits,%
0.03 max.
2.00 max.
1.00 max.
0.040 max.
0.030 max.
20.00-22.00 23.50-25.50 6.00-7.00 0.18-0.25 Balance (11 Shall be determined arithmetically by difference.
769 Product (Check) Anelysis Variations, Under Minimum or Over Meximum of th* Specified Limit of Element 0.01 0.04 0.05 0.005 0.005 0.25 0.20
. 0.10 O.Q1 SUPP. 4-NC
CASE N-439 CASES OF ASME BOILER AND PRESSURE VESSEL CODE Approval Date: February 23, 1987 See Numeric Index for expiration and any reaffirmation dates.
Case N-439 Use of 20Cr-18Ni-6Mo (Alloy UNS S31254) Forgings, Plate, Seamless and Welded Pipe, and Welded Tube, Class 2 and 3 Construction Section 111, Division 1 Inquiry: Under what rules may 20Cr-18Ni-6Mo (Alloy UNS S31254) forgings, plate, seamless and welded pipe,.
and welded tube be used for Section III, Division l, Class 2 artd 3 construction?
Reply: It is the opinion of the Committee that 20Cr-18Ni-6Mo (Alloy UNS S31254) may be used for Section III, Division l, Class 2 and 3 construction, provided the requirements of (a) through (f) below are met.
(a) Material shall conform to the requirements of the applicable product specification listed in Table 2.
(b) This material shall be treated as P-No. 8, Group No. 4.
(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 of Section III, Division 1.
(e) All other requirements of Section III, Division 1, for Oass 2 or 3 construction, as applicable, shall be met.
(!) This Case number and revision applied shall be id.entified on the Material Manufacturer's certification for the material.
771 TABLE 1 MAXIMUM ALLOWABLE STRESS VALUES For Metal Temperature Maximum Allowable Stress, ksi Not Exceeding, ° F Note 111 Notas I 1 l & 121 100 23.5 23.5 200 23.5 23.5
. 300 21.4 22.4 400 19.9 21.3 500 18.5 20.5 600 17.9 20.1 650 17.7 19.9 700 17.5 19.9 750 17.3 19.8 NOTES:
(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 may exceed 62Y..% (62 1'3% for High Nickel Alloys) and may also reach 90% yield strength 10.2% offset) at temperature.
This may result in a permanent strain of as much as 0.1 %.
When this amount of deformation is not acceptable, the designer should reduce the design stress to obtain an*accept-able deformation.
TABLE 2 PRODUCT SPECIFICATIONS Forgings Plate WeldP.d Tube Seamless & Welded Pipe Welded Pipe SA-182 SA-240 SA-249 SA-312 SA-358 SUPP.4-NC
__j
CASE N-440 CASES OF ASME BOILER AND PRESSURE VESSEL CODE Approval Date: February 23, 1987 See Numeric Index for expiration and any reaffirmation dates.
Case N-440 Use of 20Cr-18Ni-6Mo (Alloy UNS J93254) Castings, Class 2 and 3 Construction Section Ill, Division 1 Inquiry: Under what rules may 20Cr-18Ni-6Mo (Alloy 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-18Ni-6Mo (Alloy UNS J93254) may he used for Section III, Division l, Oass 2 and 3 construction provided the requirements of (a) through (f) below are met.
(a) Chemistry and mechanical properties shall con-form to the requirements of Tables 1 and 2 of this Case.
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 TABLE 1 CHEMICAL COMPOSITION,%
c = 0.025 max.
Cr = 19.50 - 20.50 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 s
= 0.010 max.
N = 0.180 -
0.240 TABLE 2 MECHANICAL PROPERTIES Tensile strength 80 ksi Yield strength 38 ksi Elongation 35%
Red. of area 35%
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.
Case N-441 Use of 20Cr-18Ni-6Mo (Alloy* UNS S31254) Fittings, Class 2 and 3 Construction Section Ill, Division 1
- Inquiry: Under what rules may 20Cr-18Ni*6Mo (Alloy
- UNS S31254) fittings with chemistry as listed in SA-290 be used in Section III, Division l, Class 2 and 3 construc-tion?
Reply: It is the opinion of the Committee that 20Cr-18Ni-6Mo (Alloy UNS 531254) may be used for Section rn. Division l, Oass 2 and 3 construction provided the requirements of (a) through (f) below are met.
. (a) Chemi!'ltry and mechanical properties shall con-fonn to the requirements of Alloy S31254 in SA-240.
All other requirements of SA-403 shall be met.
(b) This material shall be treated as P-No. 8, Group No.4.
(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 1_*....;,1
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TABLE 1 MAXIMUM ALLOWABLE STREii VALUES For Met.I Temper*ture Not Exl*lding, °F NOTES:
100 200 300 400 500 600 650 700 750 Maximum Allow*bl* Stress, ksi_
Note 111 Not* 111 and (2) 20.0 20.0 18.5 17.1 16.0 15.5 15.3 15.1 14.9 20.0 20.0 19.0 18.1 17.5 17.1 17.0 16.9 16.9 111 For weld fittings, a factor of 0.85 shall be qualified.
(2)
At temperatures above 100°F, the allowable stress values may exceed 62%% and may also reach 90% yield strength 10.2% offset) at temperature. This may result in a permanent strain of as much as 0.1 %. When this amount of deformation is not acceptable, the designer should reduce the design stress to obtain an acceptable deforma~ion.
SUPP. 4-NC