ML20212L165

Responds to STP Nuclear Operating Co 981012 & s Which Provided Update to TS Bases Pages B 3/4 8-14 Through B 3/4 8-17.NRC Staff Found Change Consistent with TS 3/4.8.2 DC Sources. Staff Found & Deleted Typographical Error

ML20212L165
Person / Time
Site:	South Texas
Issue date:	09/30/1999
From:	Alexion T NRC (Affiliation Not Assigned)
To:	Cottle W HOUSTON LIGHTING & POWER CO.
References
TAC-MA3880, TAC-MA3881, NUDOCS 9910070189
Download: ML20212L165 (7)

Text

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'Mr. Willi m T. Cottis' September 30,l1999 N

Pr:sident cnd Chi:f Ex:cutivs Officer STP Nuclear Operating Company South Texas Project Electric '

' Generating Station :

' P. O. Box 289 1Wadsworth, TX=77483

SUBJECT:

SOUTH TEXAS PROJECT, UNITS 1 AND 2 (STP)- REVISION TO TECHNICAL SPECIFICATION BASES PAGES B 3/4 8-14 THROl1GH B 3/4 8-17

. (TAC NOS. MA3880 AND MA3881)

Dear Mr. Cottle:

' We are responding to STP Nuclear Operating Company's October 12,1998, letter, as supplemented by letter dated December 9,-1998, which provided an update to Technical

_ Specification (TS) Bases pages B 3/4 8-14 through B 3/4 8-17. The change affects Bases section 3/4.8.2, *D.C. Sources," to provide additional information on surveillance requirements for the batteries.

1 The NRC staff has reviewed the change and finds that it is consistent with TS 3/4.8.2, "D.C.

Sources." In addition, the staff found a typographical error. On page B 3/4 8-15, there is a notation to Reference 9. However, there are no references in this section of the Bases.

Therefore, we have deleted the notation to Reference 9 in our copy of the Bases. This has been discussed with Ken Taplett of your staff and it was agreed to be acceptable.-

We are enclosing the revised TS Bases pages B 3/4 8-14 through B 3/4 8-17 that the NRC staff will use to update its copy of the STP Bases 6 Bases page B 3/4 8-13 is also enclosed. Page B 3/4 8-13 is an overleaf page and is prcvided to maintain document continuity. No changes were made to this page.

SIGNED BY Thomas W. Alexion, Project Manager, Section 1 Project Directorate IV & Decommissioning 9910070189 990930 PDR ADOCK 05000498 Division of Licensing Project Management P

PDR Office of Nuclear Reactor Regulation

. Docket Nos. 50-498 and 50-499 Bases pakes B 3/4 8-13 f h h t.

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Enclosure:

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Mr. Cornelius F. O'Keefe Mr. J. J. Sheppard, Vice President Senior Resident inspector Engineering & Technical Services U.S. Nuclear Regulatory Commission STP Nuclear Operating Company P. O. Box 910 P. O. Box 289 Bay City, TX 77414 Wadsworth, TX 77483 A. Ramirez/C. M. Canady S. M. Head, Supervisor, Licensing City of Austin Quality & Licensing Department Electric Utility Departrnent STP Nuclear Operating Company 721 Barton Springs Road P. O. Box 289 i

' Austin, TX' 78704 Wadsworth, TX 77483 Mr. M. T. Hardt Office of the Governor Mr. W. C. Gunst -

ATTN: John Howard, Director t

City Public Service Board Environmental and Natural P. O. Box 1771 Resources Policy San Antonio, TX 78296 P. O. Box 12428 Austin, TX 78711 i

Mr. G. E. Vaughn'C. A. Johnson Central Power and Light Company Jon C. Wood l

P. O. Box 289 Matthews & Branscomb l

Mail Code: N5012 One Alamo Center l

Wadsworth,TX 74483 106 S. St. Mary's Street, Suite 700 San Ar.tonio, TX 78205-3692 INPO Records Center Arthur C. Tate, Director 700 Galleria Parkway Division of Compliance & Inspection j

Atlanta, GA 30339-3064 Bureau of Radiation Control Texas Department of Health Regional Administrator, Region IV 1100 West 49th Street U.S. Nuclear Regulatory Commission.

Austin, TX 78756 l

611 Ryan Plaza Drive, Suite 400 Arlington, TX 76011 Jim Calloway Public Utility Commission of Texas D. G. Tees /R. L. Balcom Electric Industry Analysis

. Houston Lighting & Power Co.

P. O. Box 13326 P. O.. Box 1700 Austin, TX 78711-3326 Houston, TX 77251 Judge, Matagorda County Matagorda County Courthouse 1700 Seventh Street -

Bay City, TX 77414 Jack R. Newman, Esq.

Morgan, Lewis & Bockius

'1800 M Street, N.W.

Washington, DC 20036-5869 May 1999

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

SR 4.8.1.1.2.e.11 As r quired by Regulatory Guide 1.108, paragraph 2.a.(2), each DG is required to demonstrate proper operation for the D8A loading sequence to ensure that voltage and frequency are maintained within the required limits. Under accident conditions, prior to connecting the DGs to their respective busses, all loads are shed except load center feeders and those motor control centers that power Class IE loads (referred to as " permanently connected" loads).

i Upon reaching 9M of rated voltage and frequency, the DGs are then connected

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to their respective busses.

Loads are tren sequentially connected to the bus by the automatic load sequencer. This sequencing logic controls the permissive and starting signals to motor breakers to prevent overloading of the DGs due to high motor starting j

currents. The IM load sequence time interval tolerance ensures that I

sufficient time exists for the DG to restore frequency and voltsge prior to applying the next load and that safety analysis assumptions regarding ESF i

equipment time delays are not violated.

The Frequency of 18 months is consistent with the reconnendation of Regulatory Guide 1.108, paragraph 2.a.(2), takes into consideration unit conditions required to perform the Surveillance, and is intended to be consistent with expected fuel cycle lengths.

SR 4.8.1.1.2.e.12 l

' This SR verifies that the diesel will not start when the emergency stop

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lockout feature is tripped. This prevents any further damage to the diesel engine or generator.

i SR a.8.1.1.2.e.13 l

This SR verifies the requirements of Branch Technical Position PSB-1 that the load shedding scheme automatically prevents load shedding during the sequencing of the emergency loads to the bus.

It also verifies the reinstatement of the load shedding feature upon completion of the load j

sequencing action.

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SR 4.8.1.1.2.f i

j This Surveillance demonstrates that the DG starting independence has not been compromised. Also, this Suvveillance demonstrates that each engine can achieve proper speed within the specified time when the DGs are started simultaneously.

SOUTH TEXAS - UNITS 1 & 2 B 3/4 8-13 Unit 1 - A,eendment No. 68 Unit 2 - Amendment No. 57

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ELECTRICAL POWER SYSTEMS B ASES A.C. SOURCES. D.C. SOURCES. and ONSITE POWER DISTRIBUTION (Continued)

The 10-year Frequency is consistent with the recommendations of Regulatory Guide 1.108, l

paragraph 2.b, and Regulatory Guide 1.137, paragraph C.2.f.

SR 4.8.1.1.2.c This SR provided assurance that any accumulation of sediment over time or the normal wear on the system has not degraded the diesels.

He OPERABILITY of the minimum specified A.C. and D.C. power sources and associated distribution systems during shutdown and refueling ensures that: (1) the facility can be -

maintained in the shutdown or refueling condition for extended time periods, and (2) sufficient instrumentation and control capability is available for monitoring and maintaining the unit status.

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ne alternate onsite emergency power source will be capable of being loaded with, but not limited to, one train of the following equipment: RHR, ECW, CCW, associated l

instrumentation, Control Room Makeup and Cleanup Filtration System and a 150-ton EAB 1

Chiller. This altemate onsite emergency power source will be capable of being started and loaded in sufficient time to prevent the reactor coolant temperature from exceeding design limits.

The Surveillance Requirements for demonstrating the OPERABILITY of the diesel generators are in accordance with the recommendations of Regulatory Guides 1.9, " Selection of Diesel Generator Set Capacity for Standby Power Supplies," Revision 2, December 1979; 1.108,

" Periodic Testing of Diesel Generator Units Used as Onsite Electric Power Systems at Nuclear Power Plants," Revision 1, August 1977; and ASTM D975-81, ASTM D1552-79, ASTM D262282, ASTM D4294-83, and ASTM D2276-78. The standby diesel generators auxiliary systems are designed to circulate warm oil and water through the diesel while the diesel is not running, to preclude cold ambient starts. For the purposes of surveillance testing, ambient conditions are considered to be the hot prelube condition.

In order to ensure the ability of the batteries to perform their intended functior., the batteries are normally maintained in a fully charged state and the environment in which the batteries are located is maintained within the parameters used to determine battery sizing and operation. 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.

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l SOUTH TEXAS - UNITS 1 & 2 B 3/4 8-14 Unit 1 - Amendment No 68r 71 Unit 2 - Amendment No. 6h 60 1

REVISFD BY NRC LETIT.R DATED September 30, 1999

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

The Surveillance Requirements for demonstrating the OPERABILITY of the station batteries are cased on the recommendations of Regulatory Guide 1.129, " Maintenance Testing and Replacement of Large Lead Storage Batteries for Nuclear Power Plants," February 1978, and j

IEEE Std 450-1980, "lEEE Recommended Practice for Maintenance, Testing, and Replacement of Large Lead Storage Batteries for Generating Stations and Substations.

i The voltage requirements are based on the nominal design voltage of the battery and are consistent with the initialvoltages assumed in the battery sizing calculations. The seven-day Frequency is conservative with respect to manufacturer recommendations and IEEE-450.

SR 4.8.2.1.a I

This action is performed on a nommal seven-day cycle and documents inspection of the battery and battery room condition to the following attributes:

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• Charger output cunent and voltage, Pilot cell voltage, spectfic gravity nd temperature (values-recorded)

)

Table 4.8-2 specifies the normallimits for each designated pilot cell and each connected cell for electrolyte level, float voltage, and specinc gravity. The limits for the designated pilot cells float 4'

voltage and specific gravity, greater than 2.13 volts and 0.015 below the manufacturer's full charge specific gravity or a battery charger current that had stabilized at a low value, are characteristic of a charged cell with adequate capacity. The seven-day frequency is conservative with respect to manufacturer, IEEE Std 450-1980 and regulatory guide recommendations.

SR 4.8.2.1.b This action is performed on a nommal 92-day cycle and documents measurement of the battery parameters to include the following attributes:

Voltage and specific gravity of each cell Electrolyte temperature of selected representative cells e

Connections are visually inspected and resistance measurement is performed only on a connection that appears to be loose or corroded Table 4.8-2 specifice the normal limits for each designated pilot cell and each connected cell for electrolyte level, float voltage, and specific gravity. The normallimits for each connected cell for float voltage and specific gravity, greater than 2.13 vohs and not more than 0.020 below the manufacturer's full charge specific gravity with an average specific gravity of all the connected cells not more than 0.010 below the manufacturer's full charge specific gravity, ensures the OPERABILITY and capability of the battery. The 92-day frequency is consistent with manufacturer and regulatory guide recommendations.

SOLTFH TEXAS - UNITS 1 & 2 B 3/4 8-15 Unit 1 - Amendment No. 68,-W76 Unit 2 - Amendment No. Mr60,65 REVISED DY NRC LFilTER DATED September 30, 1999

T

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FIFCTRICAL POWER SYSTEMS BASES' f

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

. Operation with a battery cell's parameter outside the normallimit but within the allowable value specified in Table 4.8-2 is permitted for up to seven days. During this seven-day period: (1) the allowable values for electrolyte level ensures no physical damage to the plates with an adequate electron transfer capability; (2) the allowable value for the average specific gravity of all the cells,' not more than 0.020 below the manufacturer's recommended full charge specific gravity, ensures that the decrease in rating will be less than the safety margin provided in sizing; (3) the j

allowable value for an individual cell's specific gravity, ensures that an individual cell's specific gravity will not be more than 0.040 below the manufacturer's full charge specific gravity and that the overall capability of the battery will be maintained within an acceptable limit; and (4) the

' allowable value for an individual cell's float voltage, greater than 2.07 volts, ensures the battery's capability to perform its design function.

SR 4.8.2.1.c.1. 2 & 3 This action is performed on an 18-month (maxunum) cycle and documents inspection of the battery to include the following attributes:

i Detailed visual inspection of each cell, including plate condition

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. Detailed visualinspection of battery rack Bolted connections cleaned, coated with anti-corrosion material and retorqued

'* Resistance of bolted connections measured and recorded Visual inspection and resistance measurements of inter-cell, inter-nck, inter-tier, and terminal connections provide an indication of physical damage or abnornd deterioration that could indicate degraded battery condition. The anticorrosion materialis used to help ensure good electrical connections and to reduce terminal deterioration. The visualinspection for corrosion is not intended to require removal of and inspection under each terminal connection. The removal of visible corrosion is a preventive maintenance SR. The presence of visible corrosion does not necessarily represent a failure of this SR provided visible corrosion is removed during performance of SR. The surveillance frequency of 18 months exceeds the IEEE-450 recommendation of 12 months, and is consistent with extension of the refuel cycle to 18 months.

SR 4.8.2.1.c.4 -

This action is performed on an 18-month (maximum) cycle and documents the capability of the battery charger to supply rated current at 125 V for a period of eight hours. The battery charger supply is required to be based on the largest combined demands of the various steady state loads and the charging capacity to restore the battery from the design mimmum charge state to the fully charged state, irrespective of the status of the unit during these demand occurrences.

The mimmum required amperes and duration ensures that these requirements can be satisfied.

The surveillance frequencyis acceptable, and is intended to be consistent with the expected fuel cycle lengths.

SOUTH TEXAS - UNITS 1 & 2 B 3/4 8-16 Unit 1 REVISED BY NRC LETTER Unit 2 DATED September 30, 1999

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l ELECTRICAL POWER SYSTEMS l

BASES l

AC. SOURCES. D.C. SOURCES. and ONSITE POV/ER DISTRIBUTION (Continued)

SR 4.8.2.1.d i

A battery service test is a special test of battery capability, as found, to satisfy the design requirements (battery duty cycle) of the DC electrical power system. The discnarge rate and test length should correspond to the design duty cycle requirements. The surveillance frequency of 18 months is consistent with the recommendations of Regulatory Guide 1.129, which state that the battery service test should be performed during refueling operations, or at some other outage, with intervals between tests not to exceed 18 months.

SR 4.8.2.I.e A battery performance discharge test is a test of constant current capacity of a battery, normally done in the "as found" condition, after having been in service, to detect any change in the capacity determmed by the acceptance test. This test is intended to determine overall battery degradation due to age and usage. A performance discharge test is allowed in lieu of a service test once per 60 months.

SR 4.8.2.1.f The performance discharge test surveillance frequency for this test is normally 60 mondis.

If the battery has reached 85% ofits expected life, or if the battery capacity has decreased by 10 percent or more of the manufacturer's rating, the surveillance frequency is reduced to 18 months because the test must be performed during the refueling operations. The 18 month interval exceeds the IEEE-450 recommendation.

3/4.8.4 (Not Used) i SOUTH TEXAS - UNITS 1 & 2 B 3/4 8-17 Unit 1 REVISED BY NRC LETTER Unit 2 DATED September 30, 1999