ML20246N791

Part 21 Rept Re Room Cooler Vents & Drains Mfg by Carrier Corp Per Bechtel Specs,W/Galvanic Corrosion at Interface w/90-10 copper-nickel Room Cooler Supply & Return Headers. Vents & Drains Will Be Modified During Current Outage

ML20246N791
Person / Time
Site:	Callaway
Issue date:	05/10/1989
From:	Schnell D UNION ELECTRIC CO.
To:	NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM)
References
REF-PT21-89, REF-PT21-89-085-000 PT21-89-085-000, PT21-89-85, ULNRC-2005, NUDOCS 8905220005
Download: ML20246N791 (3)

Text

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1901 Gratic' Street Post Office Box 149

,f; . St Louis, Mis:,oun 63166 314 554-2650 UNION * "R '!?'"

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33 May 10, 1989 U. S. Nuclear Regulatory Commission Document Control Desk Washington, D.C. 205S5 ULNRC-2005 Gentlemen:

Docket Nc. 50-483 Callaway Plant Facility Operating License NPF-30 10 CFR Part 21 Report - Room Cooler Vents and Drains On May 8,'1989, it was~ determined that a defect' reportable per 10 CFR Part 21 existed in the design and-construction of safety related room cooler vents and drains. This defect is due to galvanic corrosion of carbon steel vents and drains at the interface with

'90-10 copper-nickel room cooler supply and return headers. The vents and drains are located at the room coolers in the Essential Service Water system. The Essential Service Water system is an'ASME Class 3 system and is designed and constructed in accordance with the requirements of Regulatory Guide 1.29, Rev. 3, Seismic Design Classification.

The room coolers were manufactured by Carrier Corporation in accordance with Bechtel Specification No.-10466-M-612(Q). The room coolers, as supplied, included 1/2 inch carbon steel vent and drain lines which were welded or brazed to the copper-nickel supply and return headers provided by Carrier as part of the room cooler design. A total of 16 room coolers in both trains of the Essential Service Water system were affected.

I Based on inservice leakage on one of the coolers which occurred during the previous fuel cycle, an inspection program was conducted during the current V

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ULNRC-2005 Page 2 of 2 refueling outage. Inspection revealed galvanic corrosion of the carbon steel vent and drain line stubs which penetrated through the copper-nickel headers into the flow stream. This corrosion, if undetected and uncorrected, could have eventually affected the integrity of the Essential Service Water system during postulated operational or seismic events. All room cooler vents and drains will be modified during the current refueling cutage to eliminate the carbon steel to copper-nickel interface.

.This report is being provided as notification pursuant to 10CTR21.21(b). No additional report is planned unless additional information is requested.

By copy of.this letter, notificrti.on is being provided to Bechtel Power Corporatic and to Carrier Corporation.

If you have any questions concerning this notification, please contact Mr. William R. Campbell, Manager, Nuclear Engineering.

Very truly yours, Donald F. Schnell WRC/cs

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Copy distribution for ULNRC-2005 Mr. A. Bert Davis Mr. R. W. DeFayette Regional Administrator Chief, Reactor Projects Section 3A U.S. Nuclear Regulatory Commission U.S. Nuclear Regulhtory Commission Region III Region III 799 Roosevelt Road 799 Roosevelt Road

. Glen Ellyn, IL 60137 Glen Ellyn, IL 60137 Mr. T. W. Alexion (2) American Nuclear Insurers Office of Nuclear Reactor Regulation c/o Dottie.Sherman, Library U.S. Nuclear Regulatory Commission The Exchange Suite 245 Mail Stop 13-E-21 270 Farmington Avenue Washington, D.C. 20555 Farmington, CT 06032 Manager, Electric Department Mr. O. Maynard Missouri Public Service Commission Wolf Creek Nuclear Operating Corp.

P.O. Box 360 P.O. Box 411 Jefferson City, MO 65102 Burlington, KS 66839 Director, Office of Nuclear Material Director, Office of Nuclear Safety and Safeguards (3 copies) Reactor Regulation (3 copies)

U.S. Nuclear Regulatory Commission U.S. Nuclear Regulatory Commission Washington, D.C. 20555 Washington, D.C. 20555 I

Records Center Mr. Merlin Williams Institute of Nuclear Power Operations Supt. of Regulatory Quality and Suite 1500 Administrative Services 1100 Circle 75 Parkway Wolf Creek Nuclear Operating Corp.

Atlanta, GA 30339 P.O. Box 411 Burlington, KS 66839 Mr. B. H. Little NRC Senior Resident Inspector 1

l Carrier Corporation Bechtel Power Corporation Mr. Roman Iwachiw Mr. Nar P. Goel Quality Assurance Manager 15740 Shady Grove Road Replacement Products Division Gaithersburg, MD 20877 P.O. Box 4808 Syracuse, NY 13221 L___ ___ __ _ __