ML17347A449

Summarizes Enhancements Made in Nuclear Unit Power Turbine Runback Logic as Result of Task Force Review of Original Logic Design,As Discussed at 840220 Meeting & in 840221 Ltr

ML17347A449
Person / Time
Site:	Turkey Point
Issue date:	04/26/1987
From:	Woody C FLORIDA POWER & LIGHT CO.
To:	NRC OFFICE OF ADMINISTRATION & RESOURCES MANAGEMENT (ARM)
References
L-87-173, NUDOCS 8705060045
Download: ML17347A449 (4)

Text

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~r, ACCESSION NBR: 8705060045 DOC. DATE.: 87/00 /26 NOTARIZED: NO DOCKET FACIL: 50-250 Turkey Point Planti Unit Si Florida Power and Light C 05000250 AUTH. NAME 4lOODYi C. O.

50-251 Turkey Point Plant. Unit 4i Florida Power and Light C 05000251 AUTHOR AFF I LIAT ION Florida Power Zc Light Co.

REC IP. NAME RECIPIENT AFFILIATION Document Control Branch (Document Contro 1 Desk )

SUBJECT:

Summarizes enhancements made in nuclear unit poeer turbine runback logic as result o~ task force revieto oF original logic design> as discussed at 840220 meeting Zc in 840221 ltr.

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FLORIDA POWER & LIGHT COMPANY APRIL HU I987 L l73 U. S. Nuclear Regulatory Commission Attn: Document Control Desk Washington, D. C. 20555 Gent lem en:

Re: Turkey Point Units 3 and 4 Docket Nos. 50-250 and 50-25 I Turbine Runback Lo ic Modifications As discussed in the February 20, l984 meeting with NRC Region II Staff in Atlanta and FPL letter L-84-36 issued February 2I, l984, provided below is a summary of the enhancements which have been made in the nuclear unit power runback logic on both Turkey Point Units 3 and 4 as a result of the task force review of the original logic design.

A) Enhanced redundancy in the Rod-on Bottom signals in the Rod Position Indication (RPI) rack by providing two separate RPI signals into the turbine runback initiating logic.

II B) Modified the governor runback and load limit runback logics so that either a RPI or a one-out-of-four nuclear instrumentation (NIS) flux rate signal (when selected) will initate both the turbine governor and load limit runbacks.

C) Modified the load limit runback logic so that a steam generator feedwater pump breaker trip with turbine first stage pressure above 60 percent load will automatically initiate a turbine runback.

Should there be any questions on this information, please contact us.

Very truly yours, C. O. Wo Group Vice President Nuclear Energy COW/SDF/gp cc: Dr. J. Nelson Grace, Regional Administrator, Region II, USNRC Senior Resident Inspector, USNRC, Turkey Point Plant 870S0S0OOS 870OZS PDR ADOCK 05000250 P PDR,J PEOPLE... SERVING PEOPLE SDF I /008/I

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