ML19224C445
| ML19224C445 | |
| Person / Time | |
|---|---|
| Site: | Farley  |
| Issue date: | 06/20/1979 |
| From: | James O'Reilly NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II) |
| To: | Clayton F ALABAMA POWER CO. |
| References | |
| NUDOCS 7907020374 | |
| Download: ML19224C445 (1) | |
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+# n aseg'o UNITED STATES o
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,T 't NUCLEAR REGULATORY COMMISSION RE GION il
$ ' \\).Q ' [E 101 M A RIETT A sT., N.W., sulT E 3100 0,,
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..a JUN 2 0 M9 In Reply Ref er To RII:JPO 50-348 50-364 Alabama Power Company Atta:
F. L. Clayton, Jr.
Executive Vice President Post Office Box 2641 Birminghan, Alabama 35291
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Centlemen:
This Infore.ation Notice is provided as an early notification of a possibly It is expected that recipients will review the info ma-significant matter.
No specific action or tion for possible applicability to their facilities.If further NRC evaluations so indicate, response is requested at this time.an IE Circular or Bulletin vill be issued to If you have qt.estions regarding this matter, please contact licensee actions.
the Director of tha sppropriate NRC Regional Office.
i Sincerely,
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kJames P, O'Rei Director Enclosures 1.
IE Information Notice No. 79-17 2.
List of Information Notices Issued in 1979 271 248 S
790702o37V
Ni201979 y
i Alabama Power Company cc v/ enc 1:
A. R. Barton Executive Vice President Post Office Box 2641 Bircingham, Alabama 35291 C. Biddinger, Jr.
Manager-Corporate Quality Assurance Post Gifice Box 2641 Birmingham, Alabama 35291 E. O. Thrash Manager-Fuclear Generation Post Office Box 2641 35291
.Bircingham, Alabama B. G. Bairston, III Plant Manager Drawer 470 Ashford, Alabama 36312 l
R. E. Hollands, Jr.
QA Supervisor Post Office Box 0 Ashford, Alabama 36312 2
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s 2/1 249
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UNITED STATES NUCLEAR REGUIATORY COMKISSION OFFICE OF INSPECTION AND ENFORCEMENT 1
WASHINGTON, D.C.
20555 June 20, 1979 IE Infor=ation Notice No. 79-17 SOURCE HOLDER ASSEMELY DA%GE FROM MISFIT BETVEEN ASSDGLY AND REACTO GRID PLATE Description of Circu= stances:
Recently, the NRC was infor=ed of a proble= at two Westinghouse WR f acilities
~. resulting fro: an apparent misfit between secondary source holder asse=blies and the reactor upper grid plate.
The elsfit proble= vas first identified by Carolina Power & Light, licensee for B. B. Robinson Unit 2, who informed the NRC on m y 6, 1979, of the circum-During the current refueling outage at E. B. Robinson 2, CP&L deter-stances.
mined that two secondary source holder assechlies had been da=sged during the previous refueling in February 1978, by a cisfit between the asse=bly and the The nisfit result d fro = insufficient clearance reactor upper grid plate.
(i.e. 1/2 to 3/4 inch) between the source holder asse=bly hub and the grid This lack plate at the core locations containing thercoccuple =ixing vanes.
u of sufficient clearance caused minor defor=ation of the upper grid plate com-
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The defor=a-the core location and of the source holder r.sse=blies.
ponents at tion also resulted in so=e bending of the fuel rods in the asse=bly, however, in no case did this bending recult in fuel cladding perforation.
the licensee of D. C. Cook Unit 1 informed the NRC that the On b y 16, 1979, present refueling outage vould be extended 15 to 20 days to remove the reactor head, which had already been reinstalled following completion of refueling, to correct this =isfit proble=. They learned of the proble= fro = Vestinghouse.
Subsequently, the licensee's inspection revealed that the source holder The source holder was re=oved O
asse=bly hubs were in contact with the vanes.
fro = one asse:bly readily with no apparent da: age while in the other the source holder was found stuck in the asse=bly. The proble: vas corrected prior to return to operations.
The secondary source asse=bly rods are norna11y inserted into rod cluster Each such control asst =blies and placed at syc=ctrical locations in the core.
asse=bly contains a syc:=ctrical grouping of four secondary source rods and between zero and twenty burnable po
- -. _ le g g in the assembly not iilled with a source or btrnable p DUPLICATE DOCUMENT of sufficient clearance for these 271 250 only at the core locations which c previously enterea nto sy te un er l
^"o 190(o M6.\\20 No. of pages:
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