ML20107D647
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Jersey Central Power & Light Company v
M D SON AVENUE AT PUNCH BOWL ROAD
- MORRISTOWN, N.J.07960
- 201-539-6111 7
Public Utilities' Corporation General en,.
7ctober 17, 1975 GD-75-008 I
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Mr. George Lear, Chief
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Operating Reactors Branch #3 1 ~, ';. '.
H, Division of Reactor Licensing p '
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United States Nuclear Regulatory Commission D..
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Dear Mr. Lear:
Subject:
Oyster CreekluQ) ear Generating Station Docket No. 50-219 Control R6d Drive Technical Specifications Your letter of September 25, 1975, proposed changes to o'ur Technical Specifications for control rods to mitigate the consequences of control drive failure from possible cracking in the collet housings of the drives.
It is noted that su.ch cracking has been observed at three facilities.
The Oyster Creek Station has been in commercial operation since the
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latter part of 1969.
During this period, the Oyster Creek Station has never experienced a control rod drive that could not be moved with scram pressure.
Also, approximately twenty control rod drives were examined for collet housing cracking (i.e., dye penetrant checked) subsequent to the observed crackir.g at the three facilities. These drives were typical of those currently in service since some drives are replaced during each refueling outage as part of the preventive maintenance program. That is, drives that cre removed for preventive maintenance are replaced by drives that have been removed from earlier outages. Such cycling assures that spare drives (i.e., those to be used as replacements and those that were examined for collet housing cracking) are a representative sample of the drives in service.
No evidence of collet housing cracking was found in any of the control rod drives inspected.
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t Our five-year operational history and specific inspection results convince us that the collet housing cracking is not a problem at the Oyster Creek Station.
We do not, however, take exception to your plans to impose the specifications included in your letter of September 25, 1975 at this 7
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Mr. Ge:rg] Le:r Pcg3 II October 17, 1975 n g:r time. We do plan to document formally our inspection data, operational history, and analysis of information provided'by the General Electric Company on the possible cause of and preventive measures for the observed cracking. These will be submitted to you in support of a request to remove the imposed specifications.
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Very truly yours, d#
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RECEIVED Ivan R.' Fin roc, Jr.
U.S.N.R.C.
Vice Presi ent OCT 3 ' 1975 p
, KING OF PRUSSIA, PA.
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