ML19352A080
| ML19352A080 | |
| Person / Time | |
|---|---|
| Site: | Oyster Creek |
| Issue date: | 09/30/1976 |
| From: | Ross D JERSEY CENTRAL POWER & LIGHT CO. |
| To: | James O'Reilly NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I) |
| References | |
| IEB-76-07, IEB-76-7, NUDOCS 8103030033 | |
| Download: ML19352A080 (2) | |
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Pubhc Uohbes Corporahon General Br$Fa s September 30, 1976 Mr. James P. O'Reilly, Director Office of Inspection and Enforcement Region I United States Nuclear Regulatory Commission 631 Park Avenue King of Prussia, Pennsylvania 19406
Dear Mr. O'Reilly:
Subject:
Oyster Creek Nuclear Generating Station Docket No. 50-219 IE Bulletin No. 76-07 This is to correct information forwarded to you in my letter of August 18, 1976 in response to IE Bulletin 76-07.
The bulletin is concerned with modifications to control circuits of fuel cask handling cranes.
In the response to the bulletin, it was reported that "there have been no changes to date and no changes planned for the crane used at Oyster Creek." As was reported in the response, there were no changes made in regard to the slow speed capability.
However, prior to the installation of the Cask Drop Protection System during January,1975, the reactor building crane control circuit was modified to provide redundancy to the brake system controls.
At the completion of a normal hoisting or lowering operation of the main or auxiliary hoist drive, the associated hoist brake coils are de-energized allowing brake engagement.
Prior to the modification, in order to de-energize either brake coil, the control circuit required a single time delay relay to be de-energized. The modification consisted of installing a redundant time delsy rclay which duplicates exactly the functions of the original relay so that now only one of two time delay relays need be de-energized for brake With this modification, both time delay relays must fail simultan-engagement.
eously to cause malfunction of the hoist drive brakes.
A functional test was satisfactorily performed immediately after The the redundant relay installation as part of the installation procedure.
crane was successfully used for handling the NFS-4 spent fuel cask in making 112 spent fuel shipments.
A yearly inspection and functional testing of the crane and its control circuitry is performed prior to refueling outages, w
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Mr. O'Reilly September 30, 1976 Plans are also being formulated that will permit operation of both the main and the auxiliary hoists from the pendent control station. These plans have not been finali::ed at this time, and therefore, a completion schedule and plans for review and functional testing are not yet available.
I regret the inadvertent omission of the above information in the original response.
Ve truly yours,
- N W
Donald A. Ross, Manager GeneratingStatip.ns-Nucleaf cs I
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