ML20084G117

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Responds to 691106 Request to Review Test Results of Control Rod Drives.Operation W/O Inner Filters Will Not Create Safety Problem
ML20084G117
Person / Time
Site: Nine Mile Point, Oyster Creek, 05000000
Issue date: 03/06/1970
From: Ritter G
JERSEY CENTRAL POWER & LIGHT CO.
To: Morris P
US ATOMIC ENERGY COMMISSION (AEC)
Shared Package
ML20084G120 List:
References
00721, 721, NUDOCS 8304210485
Download: ML20084G117 (2)


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Jersey Central PoweN& Light Company

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_i i M ADISoN AVENUE AT PUNCH BOWL Ro Ao e MoRRISToWN, N. J. 07960 e 539 -6811 hhrch 6, 1970 Dr. Peter A. bbrris, Director Division of Reactor Licensing United States Atomic Energy Commission Washington, D. C. 20545 -

Subject:

Oyster Creek Unit No. 1 Control Rod Drives .

Dear Dr. hbrris:

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  • w a In accordance with your letter of November 6,196(y, on the above subject, we have reviewed the accumulated operating experience and test results obtained during the start-up test program, and conclude that continued operation without the inner filters does not present a reactor safety problem. At the present time seven of the drives do have filters of varying wire mesh sise, which were left in for the purpose of monitoring their effect on scram time. There has been no increase in the average scram time of the monitored drives which include the seven drives that still have an inner filter.

While there might be some long range maintenance and economic advantage to having a 10 mil mesh inner filter in the Oyster Creek drives, this cannot be firmly concluded at this time.

Since the absence of these filters does not effect the scram time and, therefore, does not present a reactor safety problem, there is no justification for a costly outage of one to two weeks that would be required to install these filters. The 10 mil mesh-filters have been ordered, and if drive trouble that can be at-tributed to the absence of these filters is experienced, they will _i be installed in the drives. . . . - _ _ .

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Dr. Peter A. Morris March 6, 1970 We plan to keep in service for at least one year a high T W speed recording device to monitor the scram time of a selected o-+

j number of the drives, including some with inner filters and some A, A ## "

without. If the average scram time for the drives monitored does g not exhibit any unusual or unexpected change, we intend to dispense 0 4N with this monitoring tion surveillance program equipment which callsand rely on the for determining theTechnical scram Specifica Gp g g ,_

time of each operable control rod each refueling outage. fl y 6 3 Very truly yours,

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/U o. H. Ritter Vice President GHR:DRR:ep 1

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