ML19224C447
| ML19224C447 | |
| Person / Time | |
|---|---|
| Site: | Crystal River  |
| Issue date: | 06/20/1979 |
| From: | James O'Reilly NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II) |
| To: | Stewart W FLORIDA POWER CORP. |
| References | |
| NUDOCS 7907020384 | |
| Download: ML19224C447 (1) | |
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[.....%'o' UNITED STATt3 8 '
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JU!! 2 01979 In Reply Refer To:
RII:JPO 50-302 Florida Power Corporation Attn:
W. P. S t ewar t, Manag er Nuclear Operations P. O. Box 14042, Mail Stop C-4 St. Petersburg, Florida 33733 Gentlemen:
This Ir.lormation Notice is provided as an early notification of a possibly significant matter.
It is expected that recipients will review the informa-tion for possible applicability to their facilities. No specific action or response is requested at this time. If further NRC evaluations so indicate, an IE Circular or Bulletin will be issued to recorrend or request specific licensee actions. If you have questions regarding this satter, please contact the Director of the appropriate NRC Regional Office.
Sincerely, (r-James P. O'Rei Director Enclosures 1.
IE Information Notice No. 79-17 2.
List of Infor=ation Notices Issued in 1979 271 260 i507020Wf
JUN 2 01979 S
Florida Power Corporation cc w/ enc 1:
G. P. Beatty, Jr.
Nuclear Plant Superintendent Post Office Box 1228 Crystal River, Floride 32629 6
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'E UNITED STATES NUCLFN'. p.EGULM OFY CO.WISSION OTTICE OF INSPECT 1"N AND ENFORCEMENT t
WASHINGTON, D.C.
20555 June 20, 1979 IE Information Notice No. 79-17 SOL'RCE BOLDER ASSE' GLY DA. AGE FROM MISTIT BET' CRID PLATE Description of Circumstances:
Recently, the NRC vas informed of a problem at two Westinghouse PiTR faciliti resulting fro = an apparent misfit between secondary source holder asse=blies and the reactor upper grid plate.
5 The z.isfit proble= vas first identified by Carolina Power & Light, licensee
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for B. 2. Robinson Unit 2, who inforted the NRC on May 6,1979, cf the circu:n-stances.
During the current refueling outage at E. B. Robinson 2. SP&L deter-r.ined that two secondary source holder assemblies had been da= aged during t f
previous refueling in February 1978, by a r.infit between the asse=bly and the reactor upper grid plate.
The r.isfit resulted fro: insufficient cicarance (i.e. 1/2 to 3/4 inch) between the source holder asse:bly hub and the grid plate at the core locations containing thernacouple eixing vanes.
of sufficient clearance caused minor deforcation of the upper grid plate com-This lack mnts at the core location and of the source holder assemblies I-
. The defor=a-in no case did this bending result in fuel cladding perforatio
'E On May 16, 1979, the licensee of D. C. Cook Unit 1 inforced the NRC that the n
present refueling outage vould be extended 15 to 20 days to re:: eve the reactor 1;
head, which had already been reinstalled following co:pletion of refueling, to correct this misfit proble=.
Subsequently, the licensee's inspection rever. led that the source h h
asse:bly hubs were in contact with the vanes.
The source holder was re=cved fro:
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one assembly readily with no -- Trent dataEe while in the other the source holder was found stuck f Assembly. The proble: vas corrected prior to return to operations.
The secondary source assenbly rods are corrally inserted into rod cluster control asse:blies and placed at syc.ctrical locations in the core.
Each such asse=bly contains a sy:~.ctrical grouping of four secondary source rods and between zero and twenty burnable poison rods n-filled with a source or burnable p of sufficient clearance for these DUPLICATE DOCUMENT only at the core locations which e
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'o UNITED STATES
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NUCLEAR REGULATORY COMMISSION
$.g$ y 7f,e,\\(p)' E REGION il 101 M ARIE TT A ST., N W., SUIT E 3100 o,, gc,;y AT L ANT A, GEORGI A 30303 be g
In Reply Refer To:
M RII:JPO 50-321, 50-366 50-424, 50-425 Georgia Power Company Attn:
J. H. Miller, Jr.
Executive Vice President 270 Peachtree Street, N. W.
Atlanta, Georgia 30303
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Gentlemen:
Ihis Information Notice is proviaed as an early notification of a possibly significant matter. It is expected that recipients vill review the informa-tion for possible applicability to their facilities. No specific action or response is requested at this time.
If further NRC evaluations so indicate, an IE Circular or Bulletin will be issued to recormend or request specific licensee actions. If you have questions regarding this matter, please contact the Director of the appropriate NRC Regional Office.
Sincerely.
[r- - Jaces P. O'Rei Director Enclosures 1.
IE Information Notice No. 79-17 2.
List of Inforcation Notices Issued in 1979 271 263 4
e 7907020754 4
JUN 2 0 gg7g Georgia Power Cemany cc w/ enc 1:
M. Manr,, Plant Manager Post Office Box 442 Baxley, Georgia 31513 C. E. Belflower Site QA Supervisor Post Office Box 442 Baxley, Georgia 31513 K. M. Gillespie Conctruction Project Manager Pr,st Of fice Box 282 5/aynescoro, Georgia 30830
'E. D. Grover QA Site Supervisor Post Office Box 282 Waynesboro, Georgia 30830 O
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5 UNITED STATES WCLEAR REGL'LATORY COMMISSION OFFICE OF INSPECTION AND C;FORCDChT WASHINGTON, D.C.
20555 June 20, 1979 IE Information Notice No. 79-17 SOL'RCE BOLDER ASSDSLY DA". AGE FROM MITTIT BEIi'EEN ASSDELY AND REACTG UPPER GRID PLATE Description of Circu= stances:
Recently, the NRC vas informed of a problem at two Westinghouse F'a facilities resulting fro = an apparent misfit betecen secondary source holder asse=blies and the reactor upper grid plate.
I The misfit proble= vas first identified by Carolina Power & Licht, licensee for B. B. Robinson Unit 2, who inforced the NRC on May 6, 1975 of the circum-stances. During the current refueling outaSe at B. B. Robins 2, CP&L deter-mined that two secondary source holder assemblies had been 6acaEed during the previous refueling in February 1978, by a misfit between the asse=bly and the r
reactor upper grid plate. The misfit resulted fro: insufficient clearance (i.e. 1/2 to 3/4 inch) between the source holder asse bly hub and the grid plate at the core locations containing therr.,ocouple eixing vanes. Thfa lack of sufficient clearance caused minor defor=ation of the upper grid plate co:r-ponents at the core location and of the source holder asse:511es. The deforma-I-
tion also resulted in so=e bending of the fuel rods in the esse =bly, b:Never, in no case did this bending result in fuel cladding perforation.
On May 16, 1979, the licensee of D. C. Cook Unit 1 inforned the NRC that 7.he present refueling outage would be extended 15 to 20 days to re:sove the rea. ter head, which had already been reinste11ed following co:pletion of refueling, to correct this misfit problem. They learned of the proble: fro: VestinE ouse.
h Subsequently, the licensee's inspection revealed that the source holder h
assembly hubs were in contact with the vanes. The source holder was renoved fro: one assembly read'ly with no apparent de 2Ee while in the other the source holder was fou d stuck An the assembly. The proble: vas corrected prior to return to operations, The secondary source asse=bly rods are corr. ally inserted into rod cluster control assemblies and placed at sycnetrical locations in the core.
Each such asse:bly contains a syr: etrical grou in o f
betscen aero and twenty burrable poi
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filled with a source or burnable p0! DUPLICATE DOCUMENT of sufficient cicarance for these se-only at the core locaticins v'.!ch con Entire document previously entered into system under:
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