U-602516, Revises Response to GL 94-03, Intergranular Stress Corrosion Cracking of Core Shrouds in Bwrs. Core Shroud Insps Will Be Performed During Refueling Outage 7 Scheduled for Mar 1998

Revises Response to GL 94-03, Intergranular Stress Corrosion Cracking of Core Shrouds in Bwrs. Core Shroud Insps Will Be Performed During Refueling Outage 7 Scheduled for Mar 1998

ML20095C959
Person / Time
Site:	Clinton
Issue date:	11/22/1995
From:	Jackie Cook ILLINOIS POWER CO.
To:	NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM)
References
GL-94-03, GL-94-3, JGC-494-95, U-602516, NUDOCS 9512120386
Download: ML20095C959 (3)

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Ininois Power Cornpeny Chnton Power Staton P.O. Som 678 Cthton. IL 61727 Tel 217 935 5623 Fas 217 935 4632 Johti G. Cook Vice President ILLIN9IS u.602516 PGMR JGC-494-95 L30 95(11 22 )LP Novaraber 22, 1995 80.120 Docket No. 50-461 Document ControlDesk 3

Nuclear Regulatory Commission j

Washington,D.C. 20555

Subject:

Illinois Power's (IP's), Clinton Power Station's (CPS's) Revised Response to Generic Letter (GL) 94-03, "Intergranular Stress Corrosion Cracking of Core Shrouds in Boiling Water Reacton" Dcar Sir:

IP provided its GL 94-03 response to the NRC in letters U-602364, dated i

September 24,1994 and U-602369 dated December 14,1994. The purpose of this letter

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is to revise IP's response to the NRC regarding when the CPS core shroud will be inspected. IP committed, in letter U-602369 to inspect the core shroud during the sixth refueling outage (RF-6) scheduled for October 1996.

On September 2,1994, the BWR Vessels & Internals Project (BWRVIP) initiated GENE-523-113-0894, "BWR Core Shroud Inspection and Flaw Evaluation Guidelines."

This document listed CPS as a Category "A" plant. The plant characteristics for this category are 304L plants (plants with 304L stainless steel, carbon content 0.04 wt.% or less, as the shroud base material) with less than 8 hot operating years and an average conductivity at or below 0.30 S/cm during the first 5 cycles ofoperation. Presently, the calculated hot operation years at CPS at the start of RF-6 will be 7.63 years (revised from the 7.96 years in U-602369), and the average conductivity during the first five operating cycles is 0.186 S/cm, thus categorizing CPS as a Category "A" plant. GENE-523-113-0894 states that such plants have shown very low likelihood of cracking, demonstrated by field experience with the shroud and other components; therefore, an inspection is not necessary.

The NRC letter, " Evaluation of'BWR Shroud Cracking Generic Safety Assessment, Revision 1,' GENE-523-A107P-0794, August 5,1994 and 'BWR Core Shroud Inspection and Evaluation Guidelines,' GENE-523-113-0894, September 2,1994,"

to Mr. J. T. Beckman, Chairman BWR/ VIP, acknowledged agreement with the categorization of BWR plants into three groups (Category A, B, or C) and with the proposed guidance for establishing schedules for the inspection of Category A and B plants.

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U-602516 Page 2

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Based on the information contained herein, CPS will not conduct an inspection l

during RF-6. The core shroud inspections documented in our response to GL 94-03 will i

instead be performed during RF-7 scheduled for March 1998.

, provides an affidavit supporting the facts set forth in this letter.

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Sincerely yours, i

G. ook i

ice President l

JSP/csm Anachment i

cc:

NRC Clinton Licensing Project Manager NRC Resident Office, V-690 Regional Administrator, Region III, USNRC I

Illinois Department ofNuclear Safety i

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12/06/95 08:10 IL PWR CLINTON

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s to U-602516 I

J. G. Cook, being first duly sworn, deposes and says: That heis Vice President of the Nuclear Program at Illinois Power (IP), Clinton Power Station (CPS); that this letter supplying IP's response to Generic Isnter 94-03 has been prepared under his supervision and direction; that he knows the contents thereof; and that to the best of his knowledge j

and belief said letter and the facts contained therein are true and correct.

i Date: This JA_ day ofNovember 1995.

Signed:

J.G. Cook I

STATE OF IIIINOIS l SS.

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Subscribed and sworn to before me this Ag_ day ofNovember 1995.

id]$.:_.. 6.SAY (Notary Public)//

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