ML20205S351

Proposed Tech Specs Bases Page 3/4 8-3 Removing Reference to Fast Transfer Capability That Is Inconsistent with STP Design Bases as Described in UFSAR Chapters 8.2 & 8.3

ML20205S351
Person / Time
Site:	South Texas
Issue date:	04/19/1999
From:	HOUSTON LIGHTING & POWER CO.
To:
Shared Package
ML20205S348	List: ML20205S351 NOC-AE-000508, Informs That Plant TS Bases Page 3/4 8-3 Has Been Changed, Per 10CFR50.59.Change Corrects Statement by Removing Reference to Fast Transfer Capability That Is Inconsistent with Plant Design Bases as Described in UFSAR
References
NUDOCS 9904260189
Download: ML20205S351 (1)

Text

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ELECTRICAL POWER SYSTEMS l

BASES A.C. SOURCES, D.C. SOURCES, and ONSITE POWER DISTRIBUTION (Continued)

Each offsite circuit must be capable of maintaining rated frequency and voltage, and accepting required loads during an accident, while connected to the ESF busses.

Each DG must be capable of staning, accelerating to rated speed and voltage, and connecting to its respective ESF bus on detection of bus undervoltage. This will be accomplished within [10]

seconds. Each DG must also be capable of accepting required loads within the assumed loading sequence intervals, and continue to operate until offsite power can be restored to the ESF busses.

These capabilities are required to be met from a variety of initial conditions such as DG in standby with the engine hot, DG in standby conditions, and DG opera.ing in parallel test mode.

The AC sources in one train must be separate and independent (to the extent possible) of the AC sources in the other train. For the DGs, separation and independence are complete.

For the offsite AC sources, separation and independence are to the extent practical.

APPLICABILITY The AC sources are required to be OPERABLE in MODES 1,2,3, and 4 to ensure that:

a. Acceptable fuel design limits and reactor coolant pressure boundary limits are not ,

exceeded as a result of anticipated operational occurrences (A00s) or abnormal transients; and

b. Adequate core cooling is provided and containment OPERABILITY and other vital functions are maintained in the event of a postulated DBA.

The AC power requirements for Modes 5 and 6 are covered in LCO 3.8.2,"AC Sources-Shutdown."

i 3.8.1.1 Action a.

To ensure a highly reliable power source remains with one offsite circuit inoperable, it is necessary to verify the OPERABILITY of the remaining

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9904260199 990419 PDR P

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1 SOUTH TEXAS - UNITS 1 & 2 B 3/4 8-3 Unit 1 - Amendment No. 68 Unit 2 - Amendment No. H 5488-99 WITP_DSDVOLi\WP\NLWRC-WKTTSCBWdENDMLNW9W376.J1005084s

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