ELV-02433, Documents Results of NRC Dec 1990 Review Re Implementation of License Amends Issued 900710.Mod & Associated Tech Spec Change Consistent W/Intent of Reg Guide 1.9

Documents Results of NRC Dec 1990 Review Re Implementation of License Amends Issued 900710.Mod & Associated Tech Spec Change Consistent W/Intent of Reg Guide 1.9

ML20066D166
Person / Time
Site:	Vogtle
Issue date:	01/10/1991
From:	Hairston W GEORGIA POWER CO.
To:	NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM)
References
RTR-REGGD-01.009, RTR-REGGD-1.009 ELV-02433, ELV-2433, NUDOCS 9101140182
Download: ML20066D166 (2)

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ELV-02433 1 0797 '

Docket Nos. 50-424 i 50-425 V. S. Nuclear Regulatory Commission ATTN: Document Control Desk Washington, D. C. 20555' Gentlemen:

V0GTLE ELECTRIC GENERATING PLANT >

ADDITIONAL INFORMATION ON DIESEL GENERATOR JACKET WATER TEMPERATURE The purpose of this letter'.is to document the results of the NRC' review- '

conducted at the Vogtle Electric Generating: Plant (VEGP) in December,1990.

That review concerned the' implementation of license amendments, issued July 10, 1990, which note that.the~High Jacket Water: Temperature (HJWT) trip may be bypassed for the VEGP diesel generators. - As:you know, both Georgia Power Company (GPC) and the NRC concluded in their respective reviews of those amendments that the modification and associated Technical Specification change )

-are consistent ~with-the-intent of-Regulatory Guide 1.9.

The revised Technical Specification notes that the HJWT trip _ function may~ be- I bypassed. This bypass function is accomplished by closing isolation valves-in the instrument sensing-lines such that the Jacket water temperature sensors-will.

notiprovide input to the engine: trip logic. With the. trip bypassed, operators will receive:an alarm if the jacket water reaches 1900F but will not receive- an

-additional alarm when the temperature reaches 2000F,:which would have.been the' trip setpoint.- In response to GPC'_s commitments to the NRC during the:

onsite review,- the operators have been notified of this situation, through shift briefings' wh'ich were completed-in December,1990. As discussed durin onsite review,. associated revisions to Alarm Response Procedures are being g-the-made.

The revised procedures are expected to be. issued-for use by the end;of January,

-1991 and will be placed in the operations reading book for shift operators.

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Training on the procedures-will be included in the next cycle of operator retraining which will be completed by March 8,1991 9101140182 910110 PDR ADOCK0500g4 g/

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U. 5. Nuclear Regulatory Co.wission ELV-02433 Page 2 Georgia Power Company is pursuin1 additional improvements to the DG control / instrumentation system. 9ne of the improvements is to change the manner of bypassing the HJWT trip by im))ementing an automatic bypass on emergency DG start instead of the current met 1od which requires that instrument sensing line isolation valves be closed. This would result in a trip logic more analogous to the other diesel generator trips.

This improvement would allow the current DG HJWT trip protection to be available during normal DG testing without having to manually open the isolation valves on the instrument sensing lines. Georgia Power Company is currently evaluating the

must effective way to impleuent an automatic bypass for HJWT trip during an '

emergency DG start as part of the overall improvement of the DG control / instrumentation system. The method for implementing the automatic bypse ef the HJWT trip and the schedule for its implementation will be determined in conjunction with the overall control / instrumentation system ,

i rt,v i ev . This review, including the schedule for implementation, is expected to be developed by May 15, 1991 and will be available for your examination.

Sincerely, i4! . .k N w&

W. G. Hairston, 111

WGH.lll/HWM/gm xc

Georaia Power Comoan_Y

! Mr. C. K. McCoy Mr. W. B. Shi ran Mr. P. D. Rusiton Mr. R. M. Odom i NORMS I U. S. Nuclear Reaulatory Commission Mr. S. D. Ebneter, Regional Administrator _.

Mr. D. S. Hood, Licensing Project Manager, NRR Mr. B. R. Bonser, Senior Resident Inspector Vogtle

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