ML20212J244

Submits Request for Alternate Exam Requirements for Plant Re ISI Program Plan.Plant Does Not Torque Bolted Connections to Stress Values Greater than 100 Ksi

ML20212J244
Person / Time
Site:	Callaway
Issue date:	06/18/1999
From:	Passwater A UNION ELECTRIC CO.
To:	NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM)
References
RTR-REGGD-01.147, RTR-REGGD-1.147 ULNRC-4055, NUDOCS 9906290043
Download: ML20212J244 (3)

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$ Unira D:ctric One Ameren Plaza

• ' i 1901 Chouteau Avenue PO Box 66149 St. Louis, M0 63166-6149 June 18,1999 3,w,m U.S. Nuclear Regulatory Commission Attn: Document Control Desk Mail Station PI-137 Washington, DC 20555-0001 Gentlemen: ULNRC-4055 DOCKET NUMBER 50-483 CALLAWAY PLANT UNION ELECTRIC COMPANY

$4, REQUEST FOR ALTERNATE EXAMINATION AM* REQUIREMENTS FOR TiiE CALLAWAY PLANT INSERVICE INSPECTION PROGRAM PLAN dE

Reference:

uLNRC-3988 dated March i9, i999 The referenced letter transmitted a request for approval of Alternate Examination ISI 12A for Class I bolted connections inside the bioshield for Callaway Refueling Outage 10. In a telecon on June 11,1999 the Staff asked that we address bolting stresses on SA-453 Grade 660 material.

Callaway does not torque bolted connections to stress values greater than 100 ksi.

Typically, Callaway uses vendor supplied specifications for bolting torque. Timn values have historically been less than 70 ksi (for this material), usually on the order of 40 ksi. In the event that the vendor supplied specifications are not given (or there is no vendor, per se), the Callaway Bolting Manual ensures that torque values are maint aed at less than 95 ksi, for pipe flange applications and less than 81 ksi for metal to metaijoints for this material. The value of 95 ksi is the highest allowed, and wouid only be seen on connections that repeatedly leak, typically a much lower value is actually used.

The original request (referenced letter) requested approval of this Alternative Ili Examination for Callaway Refueling Outage 10. Code Case N-616 (BC-98-270, ISI 97-43) was approved at the ASME Main Committee meeting on May 21,1999. Based on this, Callaway requests approval of that the Alternate Examination requirements described in ISI- [7 f 12A for the remainder of the current inspection Interval (Interval 2). When the current /l Interval ends (December 19,2004) it is expected that the examinatic, requirements of the Code Case will be incorporated into the next revision of Regulatory Guide 1.147.

Ifyou have additional questions, please contact us.

r Sincerely, 9906290043 990618 4O Q d 483; Alan C. Passwater DR ADOCK O h Manager, Corporate Nuclear Services DS/jdg/hdh a subarbary of Amaren Corporation

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l STATE OF MISSOURI )

) sS CITY OF ST. LOUIS )

l David Shafer, of lawful age, being first duly sworn upon oath says that he is Supervising Engineer, Corporate Nuclear Services, Regulatory Operations for Union Electric Company; that he has read the foregoing document and knows the content thereof; that he has executed the same for and on behalf of said company with full power and authority to do so; and that the facts therein stated are true and correct to the best of his knowledge, information and belief.

By David Shafer Supervising Engineer, Regulatory Operations, Corporate Nuclear Services SUBSCRIBED and sworn to before me this day of Y44416 , 1999.

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cc: M. H. Fletcher l Professional Nuclear Consulting, Inc. )

19041 Raines Drive l

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Regional Administrator U.S. Nuclear Regulatory Commission t Region IV l 611 Ryan Plaza Drive Suite 400 {

Arlington, TX 76011-8064 Senior Resident Inspector Callaway Resident Office U.S. Nuclear Regulatory Commission {

j 8201 NRC Road i Steedman, MO 65077 Mr. Mel Gray (2)

Office of Nuclear Reactor Regulation U.S. Nuclear Regulatory Commission 1 White Flint, North, Mail Stop 13E16 11555 Rockville Pike Rockville, MD 20852-2738 j Manager, Electric Department Missouri Public Service Commission i P.O. Box 360 j Jefferson City, MO 65102 l Ron Kucera Department of Natural Resources P.O. Box 176 Jefferson City, MO 65102 Denny Buschbaum TU Electric P.O. Box 1002 Glen Rose, TX 76043 l l

Pat Nugent Pacific Gas & Electric Regulatory Services P.O. Box 56 Avila Beach, CA 93424 1 i