ML20151K765

Informs That,Except for Unidentifiable Leakage Limit, Insp Program for BWR Stainless Steel Piping Meets Guidelines of Generic Ltr 84-11.No Tech Spec Changes Necessary

ML20151K765
Person / Time
Site:	Grand Gulf
Issue date:	03/27/1985
From:	Novak T Office of Nuclear Reactor Regulation
To:	Richard J MISSISSIPPI POWER & LIGHT CO.
References
GL-84-11, TAC-56304, NUDOCS 8504040538
Download: ML20151K765 (2)

Text

March 27, 1985 [AC %~N O 7 I Docket No: 50-416 DISTRIBUTION:

Docket No. 50-416 NRC PDR 8

Mr. Jackson B. Richard 3 Senior Vice President, Nuclear NSIC Mississippi Power & Light Company LB #4 r/f P.O. Box 23054 Jackson, Mississippi 39205 $r ' '

OELD, Attorney 0Parr aw

Dear Mr. Richard,

ACRS (16) BGrimes

Subject:

Grand Gulf Unit 1 - Inspections of BWR S a nl Steel pn (Generic letter 84-11)

By letter dated June 3,1984, Mississippi Power & Light Company (licensee) submitted its response to Generic Letter 84-11 (GL 84-11), regarding inspections of reactor coolant s corrosion cracking (ystem IGSCC). stainless steel piping for intergranular stress The NRC staff has reviewed the licensee's submittal. The licensee indicated that the only stainless steel welds susceptible to IGSCC are 24 welds in the re-circulation piping. All 24 welds are scheduled to be mitigated by induction heating stress-improvement (IHSI) and ultrasonically inspected before and after IHSI during the first refueling outage. The licensee also indicated that the Grand Gulf Unit 1 Technical Specifications ifmited the increase of reactor i l

coolant system unidentified leakage to 2 gpm within any 4 hour4.62963e-5 days <br />0.00111 hours <br />6.613757e-6 weeks <br />1.522e-6 months <br /> period instead i of 2 gpm within any 24 hour2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br /> period as reconenended in GL 84-11.

The staff concludes that, except for the unidentified leakage limit, the i licensee's of guidelines augmented GL B4-11.inspection program for stainless steel piping meets the The staff further concludes that no Technical Speci-fication changes are required for Grand Gulf Unit I at this time to meet the more restrictive leakage limit in GL 84-11 because the plant is new and all welds susceptible to IGSCC will be mitigated by the first refueling outage.

The staff is currently revising guidelines for stainles.; steel piping inspections 1

delineated in NUREG-0313, Revision 1, "Technical Report on Material Selection.

and Processing Guidelines for BWR Coolant Pressure Boundary Piping." The t staff will review the augmented piping inspection program, including the un-identified leakage limit, for all BWR plants when Revision 2 to NUREG-0313 is implemented.

• • Sinc *efely, Thomas M. Novak, Assistant Director for Licensing 2

Division of Licensing ,

cc: See next page - -

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GRAND GULF Mr. Jackson B. Richard Senior Vice President, Nuclear Mississippi Power & Light Company P.O. Box 23054 Jackson, Mississippi 39205 cc: Robert B. McGehee, Esquire The Honorable William J. Guste, Jr.

Wise, Carter, Child, Steen and Caraway Attorney General P.O. Box 651 Department of Justice Jackson, Mississippi 39205 State of Louisiana Baton Rouge, Louisiana 70804 Nicholas S. Reynolds, Esquire Bishop, Liberman, Cook, Purcell Mr. Oliver D. Kingsley, Jr.

and Reynolds 1200 17th Street, N.W. Vice President, Nuclear Operations Washington, D. C. 20036. Mississippi Power & Light Company P.O. Box 23054 Jackson, Mississippi 39205 Mr. Ralph T. Lally Manager of Quality Assurance Middle South Services. Inc.

P.O. Box 61000 New Orleans, Louisiana 70161 Mr. Larry F. Dale, Director Nuclear Licensing and Safety Mississippi Power & Light Company P.O. Box 23054

, Jackson, Mississippi 39205 Mr. R. W. Jackson, Project Engineer 4: Bechtel power Corporation 3 15740 Shady Grove Road -

Gaithersburg, Maryland 20760 ,

I l

Mr. Ross C. Butcher Senior Resident I'1spector U.S. Nuclear Regulatory Comission .

i Route 2, Box 399 Port Gibson, Mississippi 39150 J. Nelson Grace, Regional Administrator U.S. Nuclear Regulatory Connission, Region II 101 Marietta Street, N.W., Suite 2900 Atlanta, Georgia 303?3 Mr. J. E. Cross, General Manager -

Grand Gulf Nuclear Station ' ,

l Mississippi Power & Light Company i

P.O. Box 756 ,

Port Gibson, Mississippi 39150 i

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