ML20133A529

Proposed Tech Specs 3/4.8.1 Re Electrical Power Systems

ML20133A529
Person / Time
Site:	Waterford
Issue date:	12/26/1996
From:	ENTERGY OPERATIONS, INC.
To:
Shared Package
ML20133A527	List: ML20133A525 ML20133A529
References
NUDOCS 9612310154
Download: ML20133A529 (4)

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ATTACHMENT Revised Pages l

l 9612310154 961226 PDR ADOCK 05000382 P PDR ,

l ELECTRICAL POWER SYSTEM SURVEILLANCE REQUIREMENTS 2 4.8.1.1.1 Each of the above required independent circuits between the offsite transmission network and

the onsite Class 1E distribution system shall be:

a. Determined OPERABLE at least once per 7 days by verifying conrect breaker

alignments, indicated power availability, and

< b. Demonstrated OPERABLE at least once per 18 months by transferring manually and 5 automatically unit power supply from the normal circuit to the attemate circuit.

? 4.8.1.1.2 Each diesel generator shall be demonstrated OPERABLE *:

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) a. At least once per 31 days on a STAGGERED TEST BASIS by: l i 1. Verifying the fuel level in the diesel oil feed tank, i

2. Verifying the fuel level in the diesel generator fuel oil storage tank,

3. Verifying the fuel transfer pump can be started and transfers fuel from the storage system to the diesel oil feed tank, 1

i 4. Verifying the diesel starts **. The generator voltage and frequency shall be at i

least 3920 volts and 58.8 Hz in 510 seconds after the start signal. The steady state voltage and frequency shall be maintained at 4160 + 420,-240 volts and 60 i 1.2 Hz. The diesel generator shall be started for this test by using one of the following signals:

a) Manual.

b) Simulated loss-of-offsite power by itself.

c) Simulated loss-of-offsite power in conjunction with an ESF actuation test signal.

d) An ESF actuation test signal by itself.

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• All planned starts for the purpose of surveillance in this section may be preceded by a prelube period as recommended by the manufacturer.

• • A modified diesel generator start involving idling and gradual acceleration to synchronous speed may be used for this surveillance requirement as recommended by the manufacturer. When modified start procedures are not used, the time, speed, voltage, and frequency tolerances of this surveillance >

requirement must be met.

WATERFORD - UNIT 3 3/4 8-3 AMENDMENT NO. 23,74

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. ELECTRICAL POWER SYSTEMS BASES A.C. SOURCES. D.C. SOURCES. AND ONSITE POWER DISTRIBUTION SYSTEMS (Continued) )

i The Surveillance Requirements for demonstrating the OPERABILITY of the diesel generators are consistent with the recommendations of Regulatory Guides 1.9 " Selection of Diesel Generator Set Capacity for ,

Standby Power Supplies," March 10,1971, and 1.108 " Periodic Testing of Diesel Generator Units Used as Onsite j Electric Power Systems at Nuclear Power Plants," Revision 1, August 1977, and 1.137, " Fuel Oil Systems for 1 Standby Diesel Generators," Revision 1, October 1979. Other provisions are derived from Generic Letter 93-05 1 "Line-Item Technical Specifications Improvements to Reduce Surveillance Requirements for Testing During Power Operation" 94-01 " Removal of Accelerated Testing and Special Reporting Requirements for Emergency Diesel Generators," and NUREG 1432 Standard Technical Specifications Combustion Engineering Plants The minimum voltage and frequency stated in the Surveillance Requirement are those necessary to ensure the diesel generator can accept the Design Basis Accident loading while maintaining acceptable voltage l and frequency levels. Stable operation at the nominal voltage and frequency values is also essential to establishing diesel generator OPERABILITY, but a time constraint is not imposed. This is because a typical diesel generator will experience a period of voltage and frequency oscillations prior to reaching steady state operation if these oscillations are not dampened out by load application. This period may extend beyond the 10 second acceptance criteria and could be a cause for failing the Surveillance Requirement. In lieu of a time constraint in the Surveillance Requirement, the actual time to reach steady state operation is monitored and trended. This is to ensure there is no voltage regulator or govemor degradation which could cause a diesel generator to become I inoperable. The 10 seconds in the Surveillance Requirement is met when the diesel generator first reaches the specified voltage and frequency, at which time the output breaker would close if an automatic actuation had occurred.

l The diesel generator Surveillance testing performed once per 18 months during shutdown is in ,

accordance with Regulatory Guide 1.108, Regulatory Position C.2.  !

INSERT A The maximum voltage limit in surveillance test 4.8.1.1.2.d.2 was increased to 5023 volts in response to NRC Information Notice 91-13; Inadequate Testing of Emergency Diesel Generators. A maximum voltage limit is provided to ensure that components e irically connected to the diesel generator are not damaged as a result of the momentary voltage excursion experianced during this test.

The Surveillance Requirement for demonstrating the OPERABILITY of the station batteries are based on the recommendations of Regulatory Guide 1.129," Maintenance Testing and Replacement of Large Lead Storage Batteries for Nuclear Power Plants," February 1978, and IEEE Std 450-1980, "lEEE Recommended Practice for Maintenance, Testing, and Replacement of Large Lead Storage Batteries for Generating Stri:ons and Substations."

Verifying average electrolyte temperature above the minimum for which the battery was sized, total battery terminal voltage on float charge, connection resistance values and the performance of battery service and discharge tests ensures the effectiveness of the charging system, the ability to handle high discharge rates and compares the battery capacity at that time with the rated capacity.

Table 4.8-2 specifies the normal limits for each designated pilot cell and each connected cell for electrolyte level, float voltage, and specific gravity. The limits for the designated pilot cells fioat voltage and specific gravity, greater than 2.13 volts and 0.015 below the manufacturers full charge specific gravity or a battery charger current that had stabilized at a low value, is characteristic of a charged cell with adequate capacity. The normal limits for each connected cell for float voltage and specific gravity, greater than 2.13 volts and not more than 0.020 below the manufacturers full charge specific gravity with an average specific gravity of all the connected cells not more than 0.010 below the manufacturers full charge specific gravity, ensures the OPERABILITY and capability of the battery.

WATERFORD UNIT 3 B 3/4 8-2 AMENDMENT NO. 88,92

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PROPOSED  !

REVIEWERS NOTE: The underlined text is from Letter dated November 7,1995. The italicized text was proposed in a previous change submitted by letter dated July 7,1995.

The Onsite Power System includes three 4.16 kV ESF buses (3A3-S. 383-S. and 3AB3-S). Power for safety related loads is normally supplied by the non-safety related 4.16 kV buses (3A2 and 3B2) of the Offsite Power System. Should offsite power from either of these buses be lost. the Onsite Power System will receive power automatically from the appropriate diesel aenerator. Non-safety related loads will be automatically disconnected from the safety Onsite Power System. Each ESF bus (3A3-S or 3B3-S) is redundant to the other-each can supply sufficient power to its safety related loads to enable safe shutdown or to mitiaate the consecuences of a desian basis accident. The third bus. 3AB3-S. may be connected to either 3A3-S or 3B3-S.

but never to both. Therefore 3AB3-S is not considered as a third. separate source of ESF power. The three ESF buses and their loads are tested as described below.

Surveillance requirements 4.6.1.1.2.d.3 and 4.6.1.1.2.d.5 are the integrated testing requirements that demonstrate the as designed operation of the standby A.C. power sources during loss of the offsite power source and during a loss of offsite power in conjunction with a Safety Injection Actuation Signal (SIAS).

The testing verifies all actions encountered from the loss-of-offsite power (LOOP), including shedding of the nonessentialloads and the energizing of the emergency busses and respective loads from the diesel generator. It further demonstrates the capability of the diesel generators to automatically achieve the required voltage and frequency within the speciMed time.

The requirement to verify the connection and energization of permanently connected loads and auto-connected loads is intended to satisfactorily show the relationship of these loads to the diesel generators loading logic. Permanently connectedloads are those loads that remain connected to the bus upon the bus deenergizing and are subsequently enert;aed by the dieselgenerators. Auto connectedloads are those loads that are disconnected from the bus upon the bus deenergizing and are auto-connected through the automatic loaa sequencer. Surveillance 0.8.1.1.2.d.3b veri 6es the dieselgenerators capability to energize the shutdown loads and surveillance 4.8.1.1.1.d.5b veri 6es the diesel generators capability to energize the emergency loads.

Shutdown loads are those icads required upon a LOOP (Re: FSAR Table 6.3.1). Emergencyloads are those loads required upon a LOOP in conjunction with an SIAS. This testing veri 5es that in the event of a Design Bases Accident (DBA) coincident with a loss of offsite power, the diesel generators are capable of supplying the necessary power to Engineered Safety Features (ESF) systems so that the fuel, Reactor Coolant System (RCS),

and containment design limits are not exceeded.

Surveillance reauirement 4.8.1.1.2d.1 reauires the verification at least once per 18 months of the diesel aenerators' ability to reject a load of areater than or eaual to 498 Kw while specific voltaae and frecuency constraints are maintained. The intent of this Surveillance reauirement is to reauire the diesel aenerator to reiect the laraest sinale load. The lamest sinale load on the diesel aenerator is the Essential Chiller which reauires 430 Kw under tomado/ missile conditions. The difference between the specified 498 Kw load in the Surveillance reauirement and the 430 Kw reauired by the actual laraest sinale load is a marain of conservatism. A method of rejectina a load arester than or eaual to 498 Kw utilizina the wet and dry coolina tower fans has been developed and will satisfy the Surveillance reauirement.

The loadina rance for the diesel aenerators (4000-4400 Kw) as specified la surveillance reauirements is eaual to approximately 90 to 100 percent of its continuous ratina. This provides for a rance to conduct testina without inadvertently overloadina of the diesel aenerators. Inadvertent overioadina creates unnecessary wear and mechanical stress that may adversely affect the reliability and lonaevity of the diesel aenerators.