ML19332E988

Discusses Visual Insp of Hafnium Rod Cluster Control Assemblies During Refuel-2 in Fall 1987.Results Indicate Guide Card Fretting Wear Per NRC Info Notice 87-019.All Hafnium Rods Replaced W/Silver/Indium/Cadnium Assemblies

ML19332E988
Person / Time
Site:	Callaway
Issue date:	11/30/1989
From:	Schnell D UNION ELECTRIC CO.
To:	NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM)
References
IEIN-87-019, IEIN-87-19, ULNRC-2116, NUDOCS 8912130237
Download: ML19332E988 (5)

Text

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UNION November 30', -1989

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$3l U.S. Nuclear Regulatory Commission p' ATTN: Document Control Desk i Mail Station Pl-137 P  : Washington, D.C. 20555 I

Gentlemen: 4 i ULNRC-2116 1

' DOCKET NUMBER 50-483 CALLAWAY PLANT i J

- INSPECTION OF HAFNIUM

-ROD CLUSTER CONTROL ASSEMBLIES (RCCA)

Callaway Plant Facility Operating License NPF-30 )

Condition 2.C.(4)' requires that UE perform a visual >

' inspection of a sample of-hafnium rod cluster control 4 asseublies (RCCAs) during one of the first five refueling outages and that a summary of the results be enbmitted to the NRC.

An-inspection of all hafnium RCCAs was performed during Refuel-2 in the Fall of 1987. _The inspection used a combination of visual and eddy current tech-niques. The eddy current technique represents a more ,

quantitative inspection than the visual inspection required by the subject license condition. The ,

inspection results-indicated guide card fretting wear-as identified in.NRC Information Notice 87-19. '

However, all RCCAs were considered acceptable for continued operation since at least 50% of the cladding cross sectional area remained at all axial locations

' along each RCCA rodlet. At the beginning of Cycle-3, all RCCAs were axially repositioned to provide a new wear surface.for subsequent fretting wear, o During Callaway Cycle-3, swelling of hafnium RCCAs '

was identified at other plants with Westinghouse supplied nuclear steam supply systems. Although ,

swelling was not identified at Callaway during the i I

Refuel-2 eddy current inspection, UE made a decision to replace all hafnium RCCAs with Silver-Indium-Cadmium RCCAs during Callaway Refuel-3. Replacement was completed in the Spring of 1989.

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'8912130237 891130 F EDR- ADOCK 05000483:

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.The information provided herein closes Callaway

!= License Condition 2.C.(4). If there are additional

! questions. relating to Callaway RCCA experience, please contact us.

Very truly yours, r

., Y' Donald F. Schnell DS/dvd 5

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STATE OF MISSOURI )  ;

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CITY OF ST. LOUIS )

Donald F. Schnell, of lawful age, being first duly sworn upon oath says that he is Senior Vice President-Nuclear and an-officer of 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 Donald F. Schnell Senior Vice President i Nuclear i SUBSCRIBED and sworn to before me this Jdhdayof 1987  !

V' D/ f i

BARBARA J PFAFF NOTARY PUBLIC, STATE Of MISSOURI i MY COMMISSION EXPIRES APRIL 22, 1993 l ST. LOUIS COUNTY l

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cc s . Gerald:Charnoff, Esq.

Shaw,.Pittman, Potts & Trowbridge 2300 N. . Street, N.W.

Washington, D.C. ~20037 Dr. J. O. Cermak. 3 CFA, Inc. i ll Professional Drive (Suite 110) l Gaithersburg, MD 20879

. , . -R. C; Knop Chief, Reactor Project Branch 1 v U.S. Nuclear Regulatory Commission Region III 799 Roosevelt Road

• Glen Ellyn,' Illinois 60137 Bruce Little Callaway Resident Of fice U.S. Nuclear Regulatory Commission

.RRil q Steedman, Missouri 65077 *

' Tom 1 Alexion-(2) .

l Office of Nuclear Reactor Regulation U.S. Nuclear-Regulatory Commission-1 White Flint, North, Mail Stop 13E21

+ 11555 Rockville Pike JRockville, MD 20852 Manager, Electric Department t Missouri Public Service Commission P.O.. Box 360 H Jefferson City, MO 65102 l

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.m CI bec: D. Shafer/A160.761

/0A Record (CA-758)

Nuclear Date E210.01

.DFS/ Chrono D. F. Schnell J. E. Birk J. V. Laux M. A. Stiller G. L' . Randolph R. J. Irwin H. Wuertenbaecher W. R. Campbell A. C. Passwater-R. P. Ifendling D. E. Shafer D. J. Walker O. Maynard (WCNOC)

N. P. Goel (Bechtel)

T. - P . Sharkey NS RB (Sandra Auston)

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