ML18101B277
| ML18101B277 | |
| Person / Time | |
|---|---|
| Site: | Salem  |
| Issue date: | 03/14/1996 |
| From: | Stolz J NRC (Affiliation Not Assigned) |
| To: | Eliason L Public Service Enterprise Group |
| References | |
| TAC-M93960, TAC-M93961, TAC-M93962, NUDOCS 9603200267 | |
| Download: ML18101B277 (5) | |
Text
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UNITED STATES NUCLEAR REGULATORY COMMISSION Mr. Leon R. Eliason WASHINGTON, D.C. 20555-0001 March 14,1996 Chief Nuclear Officer & President-Nuclear Business Unit Public Service Electric and Gas Company Post Office Box 236 Hancocks Bridge, NJ 08038
SUBJECT:
REQUEST TO USE CODE CASE N-539, SALEM NUCLEAR GENERATING STATION, UNITS 1 AND 2, AND HOPE CREEK NUCLEAR GENERATING STATION (TAC NOS.
M93960, M93961 AND M93962)
Dear Mr. Eliason:
The NRC staff has completed its review of the submittal dated October 26, 1995, from Public Service Electric and Gas Company (PSE&G) regarding the use of Code Case N-539, "UNS N08367 (Cast Alloy CN-3MN) in Class 2 and 3 Valves,Section III, Division l," for Salem Nuclear Generating Station, Units 1 and 2, and Hope Creek Generating Station.
Code Case N-539 was approved by the ASME Board of Nuclear Codes and Standards and will be included in the Nuclear Code Case Book for the 1995 edition of the Code.
Code Case N-539 has not yet received NRC endorsement and is not included in the list of code cases in NRC Regulatory Guide 1.84, "Design and Fabrication Code Case Acceptability -
Division l," Revision 30, dated October 1994.
Code Case N-539 states that Class 2 and 3 valves can be made from UNS N08367 (Cast Alloy CN-3MN) provided certain conditions are met.
The pressure retaining materials shall conform to SA-351, Grade CN-3MN for castings, SB-564 Grade UNS N08367 for forgings, and SB-688, Grade UNS N08367 for plate.
The pressure-temperature ratings of ANSI Bl6.34-1988, Table 2-3.16 shall be used except that the maximum temperature shall not exceed 650°F.
All other applicable requirements of ASME/ANSI Bl6.34-1988 shall be met as required by NC/ND-3500.
Weld qualifications shall be in accordance with Section IX.
The material shall be considered P-No.45.
Forgings and plate shall be heated to 2025°F to 2150°F and held for sufficient time to heat the material to temperature followed by water or similar quenching.
Castings shall be heated to 2100°F to 2150°F for at least one hour followed by water or similar quenching.
Heat treatment after welding is not required.
If heat treatment is applied, solution annealing must be repeated. This code case number must appear on the Certificate Holders' Data Report for the valve.
The licensee did not take exception to these requirements.
The material mentioned in this code case has the commercial name, AL-6XN, a material that has been used extensively in corrosive environments, particularly in sea water or brackish water. This material is a Code-approved material listed in Section II of the ASME Code.
It currently is being used for piping materials in the Hope Creek and Salem service water systems.
The original version of this material was AL-6X.
The AL-6X material could only be used in thin sections since thicker sections could not be cooled quickly enough to avoid sigma formation which has low corrosion resistance. Nitrogen rnA1/
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was added:as' an austeni~~ s~abilizer to retard the formation of sigma phase.
Even with the,presence of nitrogen, rapid cooling after solution annealing is required to maintain the corrosion resistance. It is important that the licensee exa~ine the heat treating records to ensure that the components were adequately cooled to maintain the corrosion resistance and that the licensee have the records available for future review by NRC inspectors.
The AL-6XN alloy is superior in corrosion resistance to the materials commonly used for pump and valve casings.
Commonly used materials are AISI Type 304 stainless steel containing about 18 percent chromium and 8 percent nickel, AISI Type 316 stainless steel containing about 18 percent chromium, 10 percent nickel, and 2 to 3 percent molybdenum.
By contrast, AL-6XN contains about 20 percent chromium, 25 percent nickel, and 6.5 percent molybdenum.
This material has been previously used in the service water systems at Salem and Hope Creek and has not shown any problems with corrosion or compatibility with other components in the service water systems.
On the basis of the above evaluation and the extensive successful prior use of this material in corrosive environments, the NRC staff concludes that pursuant to 10 CFR 50.55a(a)(3)(i), the proposed alterriative results in an acceptable level of quality and safety and is thus authorized for use at the Salem Nuclear G~nerating Station, Unit~ 1 and 2, and Hope Creek Generating Station.
- Docket Nos. 50-272/311 cc:
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was added as an austenite stabilizer to retard the formation of sigma phase.
Even with the presence of nitrogen, rapid cooling after solution annealing is required to maintain the corrosion resistance. It is important that the licensee examine the heat treating records to ensure that the components were adequately cooled to maintain the corrosion resistance and that the licensee have the records available for future review by NRC inspectors.
The AL-6XN alloy is superior in corrosion resistance to the materials commonly used for pump and valve casings.
Commonly used materials are AISI Type 304 stainless steel containing about 18 percent chromium and 8 percent nickel, AISI Type 316 stainless steel containing about 18 percent chromium, 10 percent nickel, and 2 to 3 percent molybdenum.
By contrast, AL-6XN contains about 20 percent chromium, 25 percent nickel, and 6.5-percent molybdenum.
This material has been previously used in the service water systems at Salem and Hope Creek and has not shown any problems with corrosion or compatibility with other components in the service water systems.
On the basis of the above evaluation and the extensive successful prior use of this material in corrosive environments, the NRC staff concludes that pursuant to 10 CFR 50.55a(a}(3}(i}, the proposed alternative results in an acceptable
- level of quality and safety and is thus authorized for use at the Salem Nutlear Generating Station, Units 1 and 2, and Hope Creek Generating Statio~.
Docket Nos. 50-272/311 cc:
See next page Sincerely, 1
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r John F. Stolz, Director Project Directorate I-2 Division of Reactor Projects - I/II Office of Nuclear Reactor Regulation
Mr. Leon R. Eliason Public Service Electric & Gas Company cc:
Mark J. Wetterhahn, Esquire Winston & Strawn 1400 L Street NW Washington, DC 20005-3502 Richard Fryling, Jr., Esquire Law Department - Tower SE 80 Park Place Newark, NJ 07101 Mr. Clay Warren General Manager - Salem Operations Salem Generating Station P.O. Box 236 Hancocks Bridge, NJ 08038 Mr. L. F. Storz Sr. V.P. - Nuclear Operations Nuclear Department P.O. Box 236 Hancocks Bridge, New Jersey 08038 Mr. Charles S. Marschall, Setiior Resident Inspector Salem Generating Station U.S~ Nuclear Regulatory Commission Drawer 0509 Hancocks Bridge, NJ 08038 Dr. Jill Lipoti, Asst. Director Radiation Protection Programs NJ Department of Environmental Protection and Energy CN 415 Trenton, NJ 08625-0415 Maryland Office of People's Counsel 6 St. Paul Street, 21st Floor Suite 2102 Baltimore, Maryland 21202 Ms. R. A. Kankus Joint Owner Affairs PECO Energy Company 965 Chesterbrook Blvd., 63C-5 Wayne, PA 19087 Salem Nuclear Generating Station, Un1ts I and 2, and Hope Creek Generating Station Richard Hartung Electric Service Evaluation Board of Regulatory Commissioners 2 Gateway Center, Tenth Floor Newark, NJ 07102 Regional Administrator, Region I U. S. Nuclear.Regulatory Commission 475 Allendale Road King of Prussia, PA 19406 Lower Alloways Creek Township c/o Mary 0. Henderson, Clerk Municipal Building, P.O. Box 157 Hancocks Bridge, NJ 08038 Mr; D. R. Powell, Manager Licensing and Regulation Nuclear Business Unit P.O. Box 236 Hancocks Bridge, NJ 08038 Mr. David Wersan Assistant Consumer Advocate Office of Consumer Advocate 1425 Strawberry Square Harrisburg, PA 17120 Ms. P. J.. Curham MGR. Joint Generation Department Atlantic Electric Company P.O. Box 1500 6801 Black Horse Pike Pleasantville, NJ 08232 Carl D. Schaefer External Operations - Nuclear Delmarva Power & Light Company P.O. Box 231 Wilmington, DE 19899 Public Service Commission of Maryland Engineering Division Chief Engineer 6 St. Paul Centre Baltimore, MD 21202-6806
Mr. Leon R. Eliason Public Service Electric & Gas Company cc:
Hope Creek Resident Inspector U.S. Nuclear Regulatory Commission Drawer 0509 Hancocks Bridge, New Jersey 08038 Mr. M. E. Reddemann General Manager - Hope Creek Operations Hope Creek Generating Station P.O. Box 236 Hancocks Bridge, New Jersey 08038 Salem Nuclear Generating Station, Unit 1 and 2, and Hope Creek Generating Station Mr. E. C. Simpson Sr. V.P. - Nuclear Engineering Nuclear Department P.O. Box 236 Hancocks Bridge, New Jersey 08038