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)

Text

. . . . .

gg - g 1

.w. ..n a 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 )

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.

l 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. j rnnnn.

gA21gggggggggggt gs i G

. . . . . . . . = - . = . . . . - - - - - - ~ ~ ~ ~ - - ' -~ ~ -* * - - -

. , ,12/06/95.

..08:09 IL PWR CLINTON

• 3014153061 to.230 903 6- - -

'~

o. .

- U-602516 Page 2 .l l

l Based on the information contained herein, CPS will not conduct an inspection I 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. 1 Attachment 1 provides an affidavit supporting the facts set forth in this letter.

\ .

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

l l

i i

j i

12/06/95 08:10 IL PWR CLINTON

• 50141W;21 g, g g s

Attachment 1 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 j

and direction; that he knows the contents thereof; and that to the best of his knowledge 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. ,

• 0mCW.8ER" '

e m asa s. m 7b //- COUNIY j My hy

':: = :::::_:: ,, _,;

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

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

.