ML19210A103
| ML19210A103 | |
| Person / Time | |
|---|---|
| Site: | Oconee, Arkansas Nuclear, Crystal River, Rancho Seco, Crane  |
| Issue date: | 07/13/1978 |
| From: | Grimes B Office of Nuclear Reactor Regulation |
| To: | ARKANSAS POWER & LIGHT CO., DUKE POWER CO., METROPOLITAN EDISON CO. |
| Shared Package | |
| ML19210A104 | List: |
| References | |
| GL-78-26, NUDOCS 7910240823 | |
| Download: ML19210A103 (2) | |
Text
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July u,1978 DISTRIBUTI0ti:
Docket File (7)
GZwetzig 50-313 Attorney, OELD (7) 50-302 50-269/270/287 OI&E ( 9)(Lead Engine f! Conner LTRS. ADDRESSED TO LICErlSEES 50-289 )
Be a by
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RReid G. ay File ( 5)
RIngram GVissing i
RE:
Cilel son We have recently sent the enclosed letter to#Yahco* k & Wilcox Company regarding the poteritial for excessive control rod guide tube wear at facilities using the.B&W design. This information is required to assess the significance of control rod guide tube wear at your facility.
We requested the required information frog the venaar, in order to provide us with an overall assessment of this problem and to minimize the amount of utility, vendor and NRC staff work required.
- However, should this approach to obtain the necessary infonnation not be successful, a direct response to the enclosed questions, from each licensee utilizing the B&W design, cill be required.
We request your cooperation with B&W in generating and analyzing the control rod guide tube wear data necessary to address this Concern.
Si ncerely, t.t e n ?>
Brian X. Grimes, Assistant Director for Engineering a Projects Division of Operating Reactors
Enclosure:
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Metropolitan Edison Company cc:
G. F. Trowbridge, Esquire Shaw, Pittman, Potts & Trowbridge 1800 M Street, N.W.
Washington, D.C.
20036 GPU Service Corporation Richard W. Heward, Project Manager Mr. T. Ga ry Broughton, Sa fe ty and Licensing Manager 260 Cherry Hill Road Parsippany, New Jersey 07054 Pennsylvania Electric Company Mr. R. W. Conrad Vice Pre.-ident, Generation 1001 3 road Street Johnstown, Pennsylvania 15907 Miss Mary V. Southard, Chairman Citizens for a Safe Environment P. O. Box 405 Harrisburg, Pennsylvania 17108 Government Publications Section State Library of Pennsylvania Box 1601 (Educati:- Suilding)
Har-i saurg, Pennsyl vania 17126 1489 133
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hg.....,j June 13,1978 Babcock & Wilcox Company ATTN:
Mr. James H. Taylor Manager, Licensing Nuclear Power Generation Division P. O. Box 1260 Lynchburg, Virginia 24505 Gentlemen:
Significant wear has been found in control rod guide tubes at the Combustion Engineering (CE) NSSS facilities.
The guide tube wear has been primarily located at the axial location where the control rod is " parked" in the fully withdrawn position during normal oper-ation.
CE postulates that the wear is caused by a flow inouced vibration of the Inconel control red against the softer Zircaloy guide tube.
Corrective actions, including increased operability surveillance, step insertion of control rods and extensive sleeving of both new and irradiated guide tubes, have been taken at all affected CE facilities.
We realize that your NSSS design is different from the GE system, however, we believe that a similar wear problem could exist at facili-ties using your NSSS design. You are requested to provide the enclosed additional information for all B&W facilities with operating licenses within 60 days of the date of this letter.
Sincerely, s
W Brian K. Grimes, Assistant Director for Engineering & Projects Division of Operating Reactors
Enclosure:
Request for Additional Info rmaton i
1489 134