05000219/LER-1989-025, Responds to 901002 Safety Evaluation Re 891216 Event Involving Two Control Rods Moving at Same Time Reported Via LER 89-025.Mod to Reduce Probability of Simultaneous Control Rod Withdrawal Will Be Installed in 13R Refueling Out

Responds to 901002 Safety Evaluation Re 891216 Event Involving Two Control Rods Moving at Same Time Reported Via LER 89-025.Mod to Reduce Probability of Simultaneous Control Rod Withdrawal Will Be Installed in 13R Refueling Outage

ML20066E408
Person / Time
Site:	Oyster Creek
Issue date:	01/11/1991
From:	Devine J GENERAL PUBLIC UTILITIES CORP.
To:	NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM)
References
5000-91-2001, C310-90-260, NUDOCS 9101220005
Download: ML20066E408 (2)

LER-2089-025, Responds to 901002 Safety Evaluation Re 891216 Event Involving Two Control Rods Moving at Same Time Reported Via LER 89-025.Mod to Reduce Probability of Simultaneous Control Rod Withdrawal Will Be Installed in 13R Refueling Outage

Event date:
Report date:
2192089025R00 - NRC Website

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, 4 OPU Nuclear Corporation N 198r One Upper Pond Road Parsippany, New Jersey OIJ54 201-315-7000 TELEX 136-482 Writer's Direct Dial Number; January 11, 1991 5000-91-2001 C310-90-260 U. S. Nuclear Regulatory Commission Attna Document Control Desk '

washington, DC 20555 Subjects Oyster Creek Nuclear Generating Station Operating License No. DPR-16 Docket No. 50-219 Two Control Rods Moving at one Time This letter responds to the Safety Evaluation (SE) by the office of Nuclear Reactor Regulation dated 10/2/90, related to the GPUN 1C CFR 50.59 review of two (2) control rode moving at one time. This event occurred on Docember 16, 1989 and was reported to the NRC via Licensee Event Report 89-025.

In their SE, the NRC concludes that GPUN's proposed reliance on a second licensed operator, to verify single rod eclection and movement, provides adequate protection to allow continued plant operation for the remainder of the current operating cycle. The ES further requires that the control selection circuitry for the control rode be modified at the next refueling outage (13R) to provide additional positive protection against withdrawal of two (2) control rods at one time.

During discussions with the NRC, following the referenced event, GPUN identified, proposed and described a plant modification it intended to implement which could greatly reduce the probability of simultaneous control rod withdrawal. This action was taken prior to and independently of the NRC imposition of the modification requirement identified in their SE.

The referenced modification will be listed in the Integrated Schedule as a "B" item. It is presently scheduled for installation during the upcoming 13R refueling outage.

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( -4 J. C. DeVine, Jr.

Director Technical Functions JCD/EP/ pip cci Mr. Alex Dromerick, Jr.

Administrator, Region 1 NRO Resident Inspector C310260 l