Text

Proposed Amendment to Technical Specification 3/4.8.2 to Modify Battery Surveillance Requirements
	ML073230120
Person / Time
Site:	South Texas
Issue date:	11/08/2007
From:	Rencurrel D; South Texas
To:	; Document Control Desk, Office of Nuclear Reactor Regulation
References
	G25, NOC-AE-07002208, STI: 32203374
	Download: ML073230120 (23)
	v • d • e

Nuclear Operating Company South Teas Proed Eketric Generatin$Station PO Baox289 Wadswvrth, Tes 77483 -

November 8, 2007 NOC-AE-07002208 File No.: G25 10 CFR 50.90 U. S. Nuclear Regulatory Commission Attention: Document Control Desk One White Flint North 11555 Rockville Pike Rockville, MD 20852-2738 South Texas Project Units 1 and 2 Docket Nos. STN 50-498, STN 50-499 Proposed Amendment to Technical Specification 3/4.8.2 to Modify Battery Surveillance Requirements Pursuant to 10 CFR 50.90, the STP Nuclear Operating Company (STPNOC) requests Nuclear Regulatory Commission approval of an amendment to the Unit 1 Operating License NPF-76 and Unit 2 Operating License NPF-80. This request proposes changes to Technical Specification 3/4.8.2.1, "DC Sources - Operating," 3/4.8.2.2, "DC Sources - Shutdown," and 3/4.8.2.3, "Battery Parameters." The proposed changes will allow battery testing activities to be performed either on-line or during shutdown.

A safety evaluation of the proposed changes and the proposed Technical Specification revision pages are included in the enclosure to this letter.

In accordance with 10 CFR 50.91(b), STPNOC is providing the State of Texas with a copy of this proposed amendment.

STPNOC requests NRC review and approval of the proposed change by June 1, 2008, to support scheduling for subsequent refueling outage activities. Implementation of the proposed Technical Specifications will require procedure changes and rescheduling of the surveillances.

The South Texas Project requests 60 days following approval by the NRC to allow for implementation of procedure revisions.

There are no commitments in this submittal.

If there are any questions, please contact either Mr. P. L. Walker at 361-972-8392 or me at 361 -

972-7867.

I state under penalty of perjury that the foregoing is true and correct.

Executed on I t/4.7 Davi( Rencurrel Vice President, Engineering & Strategic Projects PLW

Enclosure:

Evaluation of the Proposed Change A (

STI: 32203374

NOC-AE-07002208 Page 2 of 2 cc:

(paper copy) (electronic copy)

Regional Administrator, Region IV A. H. Gutterman, Esquire U. S. Nuclear Regulatory Commission Morgan, Lewis & Bockius LLP 611 Ryan Plaza Drive, Suite 400 Arlington, Texas 76011-8064 Mohan C. Thadani U. S. Nuclear Regulatory Commission Mohan Thadani Thad Hill Senior Project Manager Steve Winn U.S. Nuclear Regulatory Commission Harry Holloway One White Flint North (MS 7 D1) Eddy Daniels 11555 Rockville Pike Marty Ryan Rockville, MD 20852 NRG South Texas LP Richard A. Ratliff J. J. Nesrsta Bureau of Radiation Control R. K. Temple Texas Department of Health Kevin Polio 1100 West 49th Street Ed Alarcon Austin, TX 78756-3189 City Public Service C. M. Canady C. Kirksey City of Austin City of Austin Electric Utility Department 721 Barton Springs Road Jon C. Wood Austin, TX 78704 Matthews & Branscomb Senior Resident Inspector U. S. Nuclear Regulatory Commission P. 0. Box 289, Mail Code: MN1 16 Wadsworth, TX 77483

ENCLOSURE Evaluation of the Proposed Change

Subject:

Proposed Amendment to Technical Specification 3/4.8.2 to Modify Battery Surveillance Requirements

1.

SUMMARY

DESCRIPTION

2. DETAILED DESCRIPTION

3. TECHNICAL EVALUATION

4. REGULATORY EVALUATION 4.1 Applicable Regulatory Requirements/Criteria 4.2 Precedent 4.3 Significant Hazards Consideration 4.4 Conclusions

5. ENVIRONMENTAL CONSIDERATION

6. REFERENCES ATTACHMENTS:

1. Technical Specification Page Markups

2. Retyped Technical Specification Pages

Enclosure NOC-AE-07002208 Page 1 of 8 LICENSEE EVALUATION SOUTH TEXAS PROJECT UNITS 1 AND 2 PROPOSED AMENDMENT TO TECHNICAL SPECIFICATION 3/4.8.2 TO MODIFY BATTERY SURVEILLANCE REQUIREMENTS 1.0

SUMMARY

DESCRIPTION Technical Specification 3/4.8.2, "DC Sources," currently limits battery performance discharge testing to shutdowns. STP Nuclear Operating Company (STPNOC) proposes an amendment that will allow battery performance discharge testing to be performed while the associated unit is at power.

2.0 DETAILED DESCRIPTION Surveillance requirements 4.8.2.2.c and 4.8.2.3.f state the conditions when a battery service test or modified performance discharge test is to be performed to verify the ability of the battery to meet the design duty cycle. Currently, the test is to be performed only when the unit is shut down. This change removes that restriction, allowing the test to be performed when the unit is operating, and adds the service/modified performance test surveillance to surveillance requirement 4.8.2.1.

The battery discharge test effectively makes a battery inoperable for the duration of the test and the time required for recharging. This process takes approximately 12 hours1.388889e-4 days 0.00333 hours 1.984127e-5 weeks 4.566e-6 months . Limiting Condition for Operation (LCO) Action 3.8.2.1.a previously required that an inoperable battery bank be restored to operable status within two hours, or plant shutdown is to be initiated. Consequently, the discharge test could only be performed while the plant is shut down, because a battery performance discharge test could not be performed during Modes 1, 2, 3, or 4 without resulting in a unit shutdown under LCO Action 3.8.2.1.a when the test duration exceeded two hours.

The proposed amendment will allow battery performance discharge testing to be performed while the unit is operating. The current allowed outage time of two hours can be extended to give sufficient time for the test to be performed if determined by application of the Configuration Risk Management Program (CRMP) as previously approved in Amendments 179/166 (reference 6.1).

3.0 TECHNICAL EVALUATION

3.1 System Description 3.1.1 Class 1E Battery System The Class 1 E 125-vdc Battery System of each unit consists of four independent, physically separate busses, each energized by one of two available battery chargers and one battery. Voltage on any separate bus varies between 105 and 137.5-vdc depending upon the operating mode of battery charging equipment and system loads.

During normal operation, the 125-VDC loads are powered from the battery chargers with the batteries floating on the system. In case of a loss of normal power to the battery charger, the DC load is automatically powered from the

Enclosure NOC-AE-07002208 Page 2 of 8 station batteries. Batteries supply emergency power required for plant protection and control without interruption when the power from AC sources is interrupted.

Each battery system also supplies power to its associated inverter system, which converts DC power to AC power for the vital instrumentation and protection system. The ampere-hour capacity of each battery is sufficient to provide, for a minimum of two hours, the power required by emergency DC controls and the vital AC instrumentation and protection system. Only small DC loads and DC controls are supplied from the 125-vdc batteries.

The four 125-vdc batteries are each located in separate rooms in a seismic Category I building which inhibits propagation of fire and provides protection against missiles. Battery chargers and distribution panels associated with a given battery are located outside the battery room. HVAC ventilates each battery room using fans energized from the ESF busses. The Class 1E DC power systems are designed to withstand the effects of tornadoes, fires, and the safe shutdown earthquake without loss of function. The elevation and location of the battery rooms preclude flooding of the batteries.

Each DC electrical power subsystem has sufficient power output capacity for steady-state operation of connected loads required during normal operation, while at the same time maintaining its battery bank fully charged. Each battery charger has sufficient capacity to restore the battery from the design minimum charge to its fully charged state within 12 hours1.388889e-4 days 0.00333 hours 1.984127e-5 weeks 4.566e-6 months while supplying normal steady-state loads.

DC electrical power subsystems are required to be operable to ensure availability of the required power to shut down the reactor and maintain it in a safe condition after an Anticipated Operational Occurrence (AOO) or a postulated Design Basis Accident. Loss of any DC electrical power subsystem does not prevent the minimum safety function from being performed.

The Class 1E battery system is designed to comply with requirements of NRC Regulatory Guides 1.6, "Independence Between Redundant Standby (Onsite)

Power Sources and Between their Distribution Systems," and 1.32, "Criteria for Safety-Related Electric Power Systems for Nuclear Power Plants."

3.1.2 Class 1E Batteries The Class 1E 125 vdc batteries are of the 59-cell lead-calcium type, assembled in shock-absorbing, clear plastic, sealed containers. Spacers are provided between cells and cell clamps to prevent shifting during seismic events. The battery cells are mounted on seismic Category I, corrosion-resistant steel racks.

The batteries are sized to provide output at 80% of nameplate rating, corresponding to the expected capacity at end of life and 100% design demand.

The minimum average limit for float voltage is 2.17 volts per cell, corresponding to a total minimum float voltage of 128 volts per battery. The batteries are sized in accordance with IEEE 485-1978, "Recommended Practice for Sizing Large Lead Acid Storage Batteries for Generating Stations and Substations."

The batteries are suitable for continuous float duty and are maintained in a nominally fully charged state by the battery chargers. The batteries are designed to carry their connected ESF loads in the event of loss of AC power for two hours without power flow from the chargers.

Enclosure NOC;AE-07002208 Page 3 of 8 3.1.3 Battery Chargers There are two battery chargers associated with each of the four 125-vdc busses.

These chargers are connected to their train-related AC busses. One charger is required for each of the four channels for operability.

The primary role of the battery charger is to support the operability of its associated battery. This is accomplished by using a charger of sufficient size to carry the normal steady-state DC loads, with sufficient additional capacity to provide some minimal over-potential to the battery. A secondary safety significant function is provided by carrying the post-accident DC load after restoration of AC power (typically 10 to 15 seconds - the time required for the emergency diesel generators to come on line). In analyzed post-accident scenarios, there is no safety-related criterion for recharging a fully discharged battery in any specific time period.

Emergency procedures require that the battery breaker be opened before the battery reaches the minimum voltage required to start the associated diesel generator (107.5 vdc). Once the battery has reached this point, restoration to the fully charged state of 130 vdc will take less than 12 hours1.388889e-4 days 0.00333 hours 1.984127e-5 weeks 4.566e-6 months . In the event a battery is fully discharged, the battery chargers are sized to recharge the battery to a charging current that is stabilized at the charging voltage within 12 hours1.388889e-4 days 0.00333 hours 1.984127e-5 weeks 4.566e-6 months to accommodate the battery's 2-hour duty cycle. The batteries are floated at 2.22 VPC (131 +1/-2 vdc), and equalized at 2.31 +/-1% VPC (137.5 vdc maximum).

The output voltage of each battery charger is adjustable +/-10 percent of 141 vdc if required to allow an equalize charge to be performed when the battery is disconnected from the system. AC power to the Class 1E battery chargers associated with a given battery is supplied from independent motor control centers connected to double-ended sections of switchgear sections energized from the ESF busses and supplied with power from the emergency diesel generators when offsite sources are unavailable. Independence of the four battery systems is achieved by separation of cables and equipment and by prohibiting crossties between load groups in different trains.

Each battery charger is equipped with a DC voltmeter and ammeter. Protection is provided against power feedback from the battery to the charger and AC source should the AC source be lost.

3.1.4 Alarms and Monitoring Each DC System is provided with an annunciator window having inputs from each of the two chargers and the switchboard. The Emergency Response Facilities (ERF) computer may be used to identify which of the three inputs is being alarmed. ERF computer calculations are used to inhibit nuisance and/or duplicate alarms.

Each battery charger is provided with the following alarm circuits connected in common to the control room annunciator/ERF computer to indicate battery charger trouble:

1. DC output under- and over-voltage

2. DC ground

Enclosure NOC-AE-07002208 Page 4 of 8 Each 125 vdc switchboard has the following alarm circuits which are connected in common to the control room annunciator/ERF computer:

1. Input breaker position from battery charger (alarm when tripped)

2. Input breaker position from battery (alarm when tripped)

3. Output breaker positions of selected loads (alarm when tripped)

4. DC bus ground and over/under-voltage (combined)

In.addition to these annunciator alarms, the ESF Status Monitoring System is used to indicate bypassed or inoperable status of the battery or battery chargers.

Component level windows provided 'for the DC system indicate the following conditions:

1. Input under-voltage, charger output breaker open position, or charger input to switchboard breaker open position for each battery charger.

2. Battery output breaker open position.

Indicating instrumentation for each DC system'is provided in the control room:

" Switchboard bus voltage

Battery current 0 Battery charger current from each charger Setpoints for alarm activation are as follows:

Charger Over-Voltage 140 + 1%

Charger Under-Voltage 117 + 1%

Switchboard Under-Voltage 124 +2%

Switchboard Over-Voltage 140 + 1%

Actuation of any component-level window also actuates the system level window for that system and affected systems.

These alarms provide indication in the control room that the charger has failed.

They are not intended to inform the operator when charger voltage drifts -below the 128 vdc design limit. Use of different setpoints ensures the operators are notified when a charger failure occurs. The charger alarm at 117 vdc notifies the operator when the charger has failed. The bus voltage alarm provides a backup to this alarm.

STP does not use a conventional charger failure alarm based on low charger output current. Notification of charger failure is provided by the low-voltage alarms. .

3.1.5 Operator Actions Breaker alignments, voltages, and currents are monitored once per week in accordance with the surveillance test procedure for ESF Power Availability.

Operator rounds are performed once per shift with two shifts per'day. There is no collection of data. The- acceptance criterion for battery voltage is 129.2 to 131.8 vdc. The chargers use potentiometers that are adjusted by the operators to maintain voltage within the desired range. These values are also used in the

Enclosure NOC-AE-07002208 Page 5 of 8 weekly battery surveillance and the weekly verification of electrical system alignment surveillance.

3.2 Analytical Methods The current allowed outage time of two hours can be extended to give sufficient time for the test to be performed if determined by application of the CRMP as previously approved in Amendments 179/166 (reference 6.1). The advantage of applying the CRMP to determine the allowed outage time is that it quickly and accurately quantifies the risk associated with a given configuration, including those that involve multiple components in a single train or more than one train of equipment. Proposed application of the CRMP is an effective method to determine the safety implications associated with inoperable components. In addition, the CRMP enables the operator to identify the most effective actions (i.e., return to service priority) to take to restore the plant to a safer (i.e., less risk-significant) configuration and how prompt a corrective or compensatory action should be.

During normal operation, the 125-VDC loads are powered from the battery chargers with the batteries floating on the system. While the performance discharge test is being conducted, the associated battery charger will continue to perform its function of carrying the loads as described in Section 3.1.3 of this evaluation. Channel functionality is affected only if there is no AC power supplied to the charger, either from offsite or from onsite diesel-backed sources.

With one battery inoperable for 12 hours1.388889e-4 days 0.00333 hours 1.984127e-5 weeks 4.566e-6 months instead of two hours, the change in incremental core damage probability for the "worst case" channel (Channel IV) is 2.1 OE-08.

3.3 Accident Analyses The redundant channels of batteries and chargers are capable of mitigating the STP design-basis accidents and continue to provide defense-in-depth.

In the event that both chargers for the channel being tested become inoperable such that the associated DC loads lose power, the consequences are manageable. Loss of the Channel II and Channel IV DC loads will not result in a plant trip or transient. Loss of the Channel I and Channel III DC loads will not result in an immediate plant trip; however, a plant trip on low steam generator level will result after a loss of DC power as the Feedwater Isolation Valve hydraulic control system pressure bleeds off and the valves close. Such a trip can be anticipated by the plant operators, and it can be avoided with timely local operator action. Note that the CRMP is not intended to be used to extend the allowed outage time for configurations where the battery bank is the sole source of power available for the loads on the DC bus.

Application of the CRMP in determining the appropriate duration of battery unavailability by considering overall plant and equipment status ensures that plant configuration risk is effectively managed.

3.4 Summary During normal operation, the 125-VDC loads are powered by the battery chargers. The DC load is powered from the station batteries in the event of a loss of normal power to the battery charger. DC electrical power subsystems are required to be operable to ensure availability of the required power to shut down

Enclosure NOC-AE-07002208 Page 6 of 8 the reactor and maintain it in a safe condition after an Anticipated Operational Occurrence (AOO) or a postulated Design Basis Accident. Loss of any DC electrical power subsystem does not prevent the minimum safety function from being performed. Operability of the batteries not being tested is confirmed by plant operators and status monitoring. The allowed outage time to be applied to the battery being tested will be determined using the CRMP.

4.0 REGULATORY EVALUATION

4.1 Applicable Regulatory Requirements/Criteria The following is a list of the regulatory requirements and plant-specific design bases related to the proposed change.

Regulatory Requirements:

10CFR50, Appendix A, General Design Criterion (GDC) 17, "Electric Power Systems"

IEEE 308-1971, "Standard Criteria for Class 1 E Power Systems for Nuclear Power Generating Stations," dated August 1972

" IEEE 450-2002, "IEEE Recommended Practice for Maintenance, Testing, and Replacement of Vented Lead-Acid Batteries for Stationary Applications Regulatory Guidance:

NRC Regulatory Guide 1.6, "Independence Between Redundant Standby (Onsite) Power Sources and Between Their Distribution Systems," March 10, 1971

NRC Regulatory Guide 1.32, "Criteria for Safety-Related Electric Power Systems for Nuclear Power Plants," Revision 2, February 1977 The overall system design, including functional requirements, redundancy, capacity, and availability is in conformance with IEEE-308 criteria for Class 1E systems with the exception of intervals for battery perfoirmance discharge tests, which are in accordance with IEEE 450-2002. The battery charger supply capacity is in accordance with Regulatory Guide 1.32.

DC systems are inspected and tested to monitor the condition of the equipment to ensure reliable operation. Visual inspections, liquid level, specific gravity, and cell voltage checks, and performance discharge tests are performed at regular intervals on each battery. Maintenance and testing procedures and criteria for replacement are in accordance with IEEE 450-2002. Visual checks and performance tests are also scheduled for the battery chargers.

The proposed changes to the DC electrical power system specifications are consistent with the applicable regulatory requirements. Full charger operability based on the margin afforded in the design capacity of the battery charger continues to be required. Verification that the batteries are maintained within the established limitations ensures that the batteries have sufficient capacity to perform the required duty cycle.

Based upon the considerations discussed above:

Enclosure NOC-AE-07002208 Page 7 of 8

" There is reasonable assurance that the health and safety of the public will not be endangered by operation in the proposed manner;

Such activities will be conducted in compliance with the Commission's regulations; and

Implementation of the amendment will not be inimical to the common defense and security or to the health and safety of the public.

4.2 Precedent By using the STP Probabilistic Risk Assessment (PRA) to calculate the risk (i.e.,

CDF, LERF) from the actual plant configuration and comparing it to pre-determined risk thresholds, the CRMP is capable of determining an acceptable configuration-specific allowed outage time (AOT). Use of the CRMP for this purpose in other applications was previously approved in Amendments 179 and 166 (reference 6.1).

4.3 Significant Hazards Consideration Pursuant to 10CFR50.91, this analysis provides a determination that the proposed changes to the Technical Specifications do not involve any significant hazards consideration as defined in 10CFR50.92, as described below:

The proposed change does not involve a significant increase in the probability or consequences of an accident previously evaluated.

Performance of the surveillance is not an accident initiator. Consequently, the probability of an accident occurring is not affected by this proposed change. Accident mitigation will be provided by the redundant channels should an accident occur while a channel is being tested.

The risk-informed configuration management program, as approved in Amendments 179 and 166, effectively manages the availability of required systems, structures, and components to assure there is no significant increase in the probability of an accident. Therefore, the proposed change does not involve a significant increase in the probability or consequences of an accident previously evaluated.

" The proposed change does not create the possibility of a new or different kind of accident from any previously evaluated.

The proposed change does not involve a new mode of operation or design configuration. The only change is in the duration of a battery's unavailability, which is established consistent with the level of associated risk. Therefore, the proposed change does not create the possibility of a new or different accident from any accident previously evaluated.

The proposed change does not involve a significant reduction'in the margin of safety.

The risk-informed configuration management program assures that adequate margins of safety-are maintained. The configuration management program considers cumulative effects of multiple systems and components being out of service. Therefore, the proposed change does not involve a significant reduction in a margin of safety.

Enclosure NOC-AE-07002208 Page 8 of 8 4.4 Conclusions The proposed amendment involves no change to the facility and does not involve any change in the manner of operation of any plant systems involving the generation, collection or processing of radioactive materials or other types of effluents. Therefore, no increase in the amounts of effluents or new types of effluents would be created.

The requested license amendment involves no change to the facility and will not increase the radiation dose resulting from the operation of any plant system.

Furthermore, implementation of this proposed change will not involve work activities that could contribute to occupational radiation exposure. Therefore, there will be no increase in individual or cumulative occupational radiation exposure associated with this proposed change.

Based on the evaluation provided above, the South Texas Project concludes that the proposed change does not involve a significant hazards consideration and will not have a significant effect on safe operation of the plant. Therefore, there is reasonable assurance that: (1) the health and safety of the public will not be endangered by operation in the proposed manner; (2) such activities will be conducted in compliance with the Commission's regulations; and (3) issuance of the amendment will not be inimical to the common defense and security or to the health and safety of the public.

5.0 ENVIRONMENTAL CONSIDERATION

A review has determined that the proposed amendment would change an inspection or surveillance requirement. However, the proposed amendment does not involve (i) a significant hazards consideration, (ii) a significant change in the types or a significant increase in the amounts of any effluent that may be released offsite, or (iii) a significant increase in individual or cumulative occupational radiation exposure. Accordingly, the proposed amendment meets the eligibility criteria for categorical exclusion set forth in 10 CFR 51.22(c)(9).

Therefore, pursuant to 10 CFR 51.22(b), an environmental assessment of the proposed change is not required.

6.0 REFERENCES

6.1 Letter from Mohan C. Thadani, NRC, to James J. Sheppard, STP Nuclear Operating Company, "South Texas Project, Units 1 and 2 - Issuance of Amendments Nos. 179 and 166 Re: Broad-scope Risk-Informed Technical Specifications Amendments (TAC Nos. MD2341 and MD2342)," (Accession No. ML071780186)

ATTACHMENT 1 TECHNICAL SPECIFICATION PAGE MARKUPS

SNO CHANGES ELECTRICAL POWER SYSTEMS 3/4.8.2 DC SOURCES OPERATING LIMITING CONDITION FOR OPERATION 3.8.2.1 As a minimum, the following DC electrical sources shall be OPERABLE:

a. Channel I 125-volt Battery Bank El Al 1 (Unit 1), E2A1 1 (Unit 2) and one of its two associated chargers,

b. Channel 11 125-volt Battery Bank El D11 (Unit 1), E2D11 (Unit 2) and one of its two associated full capacity chargers,

c. Channel III 125-volt Battery Bank ElB111 (Unit 1), E2B11 (Unit 2) and one of its two associated full capacity chargers, and

d. Channel IV 125-volt Battery Bank El C1 1 (Unit 1), E2C1 1 (Unit 2) and one of its two associated chargers.

APPLICABILITY: MODES 1, 2, 3, and 4.

ACTION:

NOTE Ifthe batteries discharge for more than 2 hours2.314815e-5 days 5.555556e-4 hours 3.306878e-6 weeks 7.61e-7 months as the sole source of power to their DC bus while the CRMP is being applied and no alternate source of power is available, the LCO shall be considered not met.

a. With one of the required battery banks inoperable, within 2 hours2.314815e-5 days 5.555556e-4 hours 3.306878e-6 weeks 7.61e-7 months restore the inoperable battery bank to OPERABLE status or apply the requirements of the CRMP or be in at least 'HOT STANDBY within the next 6 hours6.944444e-5 days 0.00167 hours 9.920635e-6 weeks 2.283e-6 months and in COLD SHUTDOWN within the following 30 hours3.472222e-4 days 0.00833 hours 4.960317e-5 weeks 1.1415e-5 months .

b. With more than one of the required battery banks inoperable, within 1 hour1.157407e-5 days 2.777778e-4 hours 1.653439e-6 weeks 3.805e-7 months restore at least three battery banks to OPERABLE status or apply the requirements of the CRMP or be in at least HOT STANDBY within the next 6 hours6.944444e-5 days 0.00167 hours 9.920635e-6 weeks 2.283e-6 months and in COLD SHUTDOWN within the following 30 hours3.472222e-4 days 0.00833 hours 4.960317e-5 weeks 1.1415e-5 months .

c. With one channel with no battery chargers OPERABLE,

1. Restore battery terminal voltage to greater than or equal to the minimum established float voltage within 2 hours2.314815e-5 days 5.555556e-4 hours 3.306878e-6 weeks 7.61e-7 months , AND

2. Verify float current for the affected battery does not exceed 2 amps once per 12 hours1.388889e-4 days 0.00333 hours 1.984127e-5 weeks 4.566e-6 months , AND

3. Restore one battery charger to OPERABLE status within 72 hours8.333333e-4 days 0.02 hours 1.190476e-4 weeks 2.7396e-5 months .

If the battery terminal voltage cannot be restored in the allowed time, float current is excessive, or a battery charger is not restored to operability in the time allowed, apply the requirements of the CRMP or the affected reactor unit is to be in at least HOT STANDBY within the next 6 hours6.944444e-5 days 0.00167 hours 9.920635e-6 weeks 2.283e-6 months and in COLD SHUTDOWN within the following 30 hours3.472222e-4 days 0.00833 hours 4.960317e-5 weeks 1.1415e-5 months .

SOUTH TEXAS - UNITS 1 & 2 3/4 8-10 Unit 1 - Amendment No. 4, 73!79, 180 Unit 2 - Amendment No. 62,4166, 167

ELECTRICAL POWER SYSTEMS LIMITING CONDITION FOR OPERATION (continued)

d. With more than one channel with no battery chargers OPERABLE,

1. Restore terminal voltage for at least three battery banks to greater than or equal to the minimum established float voltage within 1 hour1.157407e-5 days 2.777778e-4 hours 1.653439e-6 weeks 3.805e-7 months , AND

2. Verify float current for the affected batteries does not exceed 2 amps once per 12 hours1.388889e-4 days 0.00333 hours 1.984127e-5 weeks 4.566e-6 months , AND

3. Restore one battery charger to OPERABLE status on at least three channels within 1 hour1.157407e-5 days 2.777778e-4 hours 1.653439e-6 weeks 3.805e-7 months .

If the battery terminal voltage cannot be restored in the allowed time, float current is excessive, or a battery charger is not restored to operability in the time allowed, apply the requirements of the CRMP or the affected reactor unit is to be in at least HOT STANDBY within the next 6 hours6.944444e-5 days 0.00167 hours 9.920635e-6 weeks 2.283e-6 months and in COLD SHUTDOWN within the following 30 hours3.472222e-4 days 0.00833 hours 4.960317e-5 weeks 1.1415e-5 months .

e. With one of the required channels inoperable for reasons other than (a), (b), (c), or (d) above, restore the channel to OPERABLE status within 2 hours2.314815e-5 days 5.555556e-4 hours 3.306878e-6 weeks 7.61e-7 months , or be in at least HOT STANDBY within the next 6 hours6.944444e-5 days 0.00167 hours 9.920635e-6 weeks 2.283e-6 months and in COLD SHUTDOWN within the following 30 hours3.472222e-4 days 0.00833 hours 4.960317e-5 weeks 1.1415e-5 months .

SURVEILLANCE REQUIREMENTS 4.8.2.1 Each 125-volt battery bank and charger shall be demonstrated OPERABLE:

a. At least once per 7 days by verifying that:

The total battery terminal voltage is greater than or equal to the minimum established float voltage.

b. Not used.

c. At least once per 18 months by verifying that:

1. The battery charger can supply at least 300 amperes at greater than or equal to the minimum established float voltage for at least 8 hours9.259259e-5 days 0.00222 hours 1.322751e-5 weeks 3.044e-6 months .

OR 2.. Each battery charger can recharge the battery to the fully charged state within 12 hours1.388889e-4 days 0.00333 hours 1.984127e-5 weeks 4.566e-6 months while supplying the largest combined demands of the various continuous steady-state loads following a battery discharge to the bounding design-basis event discharge state.

d2. NOE: 1. The soddifi.ed perorice SIR 48.2.3.f ma SOUTH TEXAin lieu of Surv2eilance Requi-ement 4.8.2. 1.2 CUnla2nned events thatosatis this s batte bh ri capa-ci t-y -isa-dequate to siuippy and maintainin OPERABLE statu~s all of the actual or simulated ESF lod o~h eind~.:O hntebte~

ýubicte~d~to a battery, service6tsif_________

d. Not used.

e. Not used.

f. Not used.

SOUTH TEXAS - UNITS 1 & 2 3/48-11 Unit 1 - Amendment No. -4,-479, 4-80 Unit 2 - Amendment No. 166,-167

NO CHANGES ELECTRICAL POWER SYSTEMS DC SOURCES SHUTDOWN LIMITING CONDITION FOR OPERATION 3.8.2.2 DC electrical power subsystem shall be OPERABLE to support the DC electrical power distribution subsystem(s) required by LCO 3.8.3.2, "Onsite Power Distribution -

Shutdown."

APPLICABILITY: MODES 5 and 6 ACTION:

a. With one or more required DC electrical power subsystems inoperable:

1. Immediately declare affected required feature(s) inoperable, OR

2. Immediately:

. Initiate action to suspend operation with a potential for draining the reactor vessel, AND Suspend all operations involving CORE ALTERATIONS, operations involving positive reactivity additions that could result in loss of required SHUTDOWN MARGIN or required boron concentration, or movement of irradiated fuel, AND

Initiate corrective action to restore the required DC electrical power subsystems to OPERABLE status as soon as possible.

b. With no battery chargers for a required channel OPERABLE:

1. Restore battery terminal voltage to greater than or equal to the minimum established float voltage within 2 hours2.314815e-5 days 5.555556e-4 hours 3.306878e-6 weeks 7.61e-7 months , AND

2. Verify float current for the affected battery does not exceed 2 amps once per 12 hours1.388889e-4 days 0.00333 hours 1.984127e-5 weeks 4.566e-6 months , AND

3. Restore one battery charger to OPERABLE status within 72 hours8.333333e-4 days 0.02 hours 1.190476e-4 weeks 2.7396e-5 months .

If the battery terminal voltage cannot be restored within the allowed time, float current is excessive, or a battery charger is not restored to operability in the time allowed:

Initiate action to suspend operation with a potential for draining the reactor vessel, AND SOUTH TEXAS - UNITS 1 & 2 3/4 8-12 Unit 1 - Amendment No. -4,-9,180 Unit 2 - Amendment No. 4-66, 167

ELECTRICAL POWER, SYSTEMS LIMITING CONDITION FOR OPERATION (continued)

Suspend all operations involving CORE ALTERATIONS, operations involving positive reactivity additions that could result in loss of required SHUTDOWN MARGIN or required boron concentration, or movement of irradiated fuel, AND Initiate corrective action to restore the required DC electrical power subsystems to OPERABLE status as soon as possible.

SURVEILLANCE REQUIREMENTS 4.8.2.2 Each 125-volt battery bank shall be demonstrated OPERABLE:

a. At least once per 7 days by verifying that the total battery terminal voltage is greater than or equal to the minimum established float voltage.

b. At least once per 18 months by verifying that the battery charger can supply at least 300 amperes at greater than or equal to the minimum established float voltage for at least 8 hours9.259259e-5 days 0.00222 hours 1.322751e-5 weeks 3.044e-6 months .

OR Verify each battery charger can recharge the battery to the fully charged state within 12 hours1.388889e-4 days 0.00333 hours 1.984127e-5 weeks 4.566e-6 months while supplying the largest combined demands of the various continuous steady-state loads following a battery discharge to the bounding design-basis event discharge state.

C. NOTE: 1. The modified performance discharge test in SR 4.8.2.3.f may be performed in lieu of Surveillance Requirement 4.8.2.2.c.

2. This surveilla-n.ce shall onriY be porform..od during shutdown,. Credit may be taken for unplanned events that satisfy this surveillance requirement.

At least once per 18 months by verifying that the battery capacity is adequate to supply and maintain in OPERABLE status all of the actual or simulated ESF loads for the design duty cycle when the battery is subjected to a battery service test.

SOUTH TEXAS - UNITS 1 & 2 3/4 8-13 Unit 1 - Amendment No. .4, 4!79, !80 Unit 2 - Amendment No. !66, !467

ELECTRICAL POWER SYSTEMS LIMITING CONDITION FOR OPERATION (continued)

f. If a battery has one or more battery cells with float voltage < 2.07 volts and float current > 2 amps, declare the associated battery INOPERABLE immediately.

SURVEILLANCE REQUIREMENTS 4.8.2.3. Each 125-volt battery bank and charger shall be demonstrated operable:

a. NOTE: Performance of this surveillance is not required when battery terminal voltage is less than the minimum established float voltage of surveillance requirement 4.8.2.1 .a.

At least once per 7 days, verify the float current for each battery is < 2 amps.

b. At least once per 31 days, verify each battery pilot cell voltage is _>2.07 V on float charge.

c. At least once per 92 days, verify each battery connected cell voltage is _>2.07 V on float charge.

d. At least once per 31 days, verify each battery connected cell electrolyte level is greater than or equal to minimum established design limits'.

e. At least once per 31 days, verify each. battery pilot cell temperature is greater than or equal to minimum established design limits.

f. NOE: Battor,' capact ist ovrfiddrn hutdoWn.

y**T- I*pc ,qit is , teste .;*unde the f,*;;~ in 4 on~

r***k ÷ollo

1. At least once per 12 months by giving modified performance discharge tests of battery capacity'to any battery that shows degradation or reaches 85% of the service life expected for the application with capacity less than 100% of the manufacturer's rating. Degradation is indicated when battery capacity drops more than 10% from its capacity on the previous performance/modified performance discharge test, or is below 90% of the manufacturer's rating; AND

2. At least once per 24 months by giving modified performance discharge tests of battery capacity to any battery reaching 85% of the service life with capacity greater than or equal to 100% of the manufacturer's rating; AND

3. At least once per 60 months by verifying that the battery capacity is at least 80% of the manufacturer's rating when subjected to a modified performance discharge test.

SOUTH TEXAS - UNITS 1 & 2 3/4 8-13c Unit 1 - Amendment No. 4-4-,7Q-9-,80 Unit 2 - Amendment No. 4 66,- 67

ATTACHMENT 2 RETYPED TECHNICAL SPECIFICATION PAGES 9

NO CHANGES ELECTRICAL POWER SYSTEMS 3/4.8.2 DC SOURCES OPERATING LIMITING CONDITION FOR OPERATION 3.8.2.1 As a minimum, the following DC electrical sources shall be OPERABLE:

a. Channel I 125-volt Battery Bank El Al1 (Unit 1), E2Al 1 (Unit 2) and one of its two associated chargers,

b. Channel 11 125-volt Battery Bank El Dl 1 (Unit 1), E2Dl1 (Unit 2) and one of its two associated full capacity chargers,

c. Channel III 125-volt Battery Bank El Bl 1 (Unit 1), E2B1 1 (Unit 2) and one of its two associated full capacity chargers, and

d. Channel IV 125-volt Battery Bank El Cl 1 (Unit 1), E2C1 1 (Unit 2) and one of its two associated chargers.

APPLICABILITY: MODES 1, 2, 3, and 4.

ACTION:

NOTE Ifthe batteries discharge for more than 2 hours2.314815e-5 days 5.555556e-4 hours 3.306878e-6 weeks 7.61e-7 months as the sole source of power to their DC bus while the CRMP is being applied and no alternate source of power is available, the LCO shall be considered not met.

a. With one of the required battery banks inoperable, within 2 hours2.314815e-5 days 5.555556e-4 hours 3.306878e-6 weeks 7.61e-7 months restore the inoperable battery bank to OPERABLE status or apply the requirements of the CRMP or be in at least HOT STANDBY within the next 6 hours6.944444e-5 days 0.00167 hours 9.920635e-6 weeks 2.283e-6 months and in COLD SHUTDOWN within the following 30 hours3.472222e-4 days 0.00833 hours 4.960317e-5 weeks 1.1415e-5 months .

b. With more than one of the required battery banks inoperable, within 1 hour1.157407e-5 days 2.777778e-4 hours 1.653439e-6 weeks 3.805e-7 months restore at least three battery banks to OPERABLE status or apply the requirements of the CRMP or be in at least HOT STANDBY within the next 6 hours6.944444e-5 days 0.00167 hours 9.920635e-6 weeks 2.283e-6 months and in COLD SHUTDOWN within the following 30 hours3.472222e-4 days 0.00833 hours 4.960317e-5 weeks 1.1415e-5 months .

c. With one channel with no battery chargers OPERABLE,

1. Restore battery terminal voltage to greater than or equal to the minimum established float voltage within 2 hours2.314815e-5 days 5.555556e-4 hours 3.306878e-6 weeks 7.61e-7 months , AND

2. Verify float current for the affected battery does not exceed 2 amps once per 12 hours1.388889e-4 days 0.00333 hours 1.984127e-5 weeks 4.566e-6 months , AND

3. Restore one battery charger to OPERABLE status within 72 hours8.333333e-4 days 0.02 hours 1.190476e-4 weeks 2.7396e-5 months .

If the battery terminal voltage cannot be restored in the allowed time, float current is excessive, or a battery charger is not restored to operability in the time allowed, apply the requirements of the CRMP or the affected reactor unit is to be in at least HOT STANDBY within the next 6 hours6.944444e-5 days 0.00167 hours 9.920635e-6 weeks 2.283e-6 months and in COLD SHUTDOWN within the following 30 hours3.472222e-4 days 0.00833 hours 4.960317e-5 weeks 1.1415e-5 months .

SOUTH TEXAS - UNITS 1 & 2 3/48-10 Unit 1 - Amendment No. 4, 73, !79, 180 Unit 2 - Amendment No. 62,166, 167

ELECTRICAL POWER SYSTEMS LIMITING CONDITION FOR OPERATION (continued)

d. With more than one channel with no battery chargers OPERABLE,

1. Restore terminal voltage for at least three battery banks to greater than or equal to the minimum established float voltage within 1 hour1.157407e-5 days 2.777778e-4 hours 1.653439e-6 weeks 3.805e-7 months , AND

2. Verify float current for the affected batteries does not exceed 2 amps once per 12 hours1.388889e-4 days 0.00333 hours 1.984127e-5 weeks 4.566e-6 months , AND

3. Restore one battery charger to OPERABLE status on at least three channels within 1 hour1.157407e-5 days 2.777778e-4 hours 1.653439e-6 weeks 3.805e-7 months .

If the battery terminal voltage cannot be restored in the allowed time, float current is excessive, or a battery charger is not restored to operability in the time allowed, apply the requirements of the CRMP or the affected reactor unit is to be in at least HOT STANDBY within the next 6 hours6.944444e-5 days 0.00167 hours 9.920635e-6 weeks 2.283e-6 months and in COLD SHUTDOWN within the following 30 hours3.472222e-4 days 0.00833 hours 4.960317e-5 weeks 1.1415e-5 months .

e. With one of the required channels inoperable for reasons other than (a), (b), (c), or (d) above, restore the channel to OPERABLE status within 2 hours2.314815e-5 days 5.555556e-4 hours 3.306878e-6 weeks 7.61e-7 months , or be in at least HOT STANDBY within the next 6 hours6.944444e-5 days 0.00167 hours 9.920635e-6 weeks 2.283e-6 months and in COLD SHUTDOWN within the following 30 hours3.472222e-4 days 0.00833 hours 4.960317e-5 weeks 1.1415e-5 months .

SURVEILLANCE REQUIREMENTS 4.8.2.1 Each 125-volt battery bank and charger shall be demonstrated OPERABLE:

a. At least once per 7 days by verifying that:

The total battery terminal voltage is greater than or equal to the minimum established float voltage.

b. Not used.

c. At least once per 18 months by verifying that:

1. The battery charger can supply at least 300 amperes at greater than or equal to the minimum established float voltage for at least 8 hours9.259259e-5 days 0.00222 hours 1.322751e-5 weeks 3.044e-6 months .

OR Each battery charger can recharge the battery to the fully charged state within 12 hours1.388889e-4 days 0.00333 hours 1.984127e-5 weeks 4.566e-6 months while supplying the largest combined demands of the various continuous steady-state loads following a battery discharge to the bounding design-basis event discharge state.

2. NOTE: 1. The modified performance discharge test in SR 4.8.2.3.f may be performed in lieu of Surveillance Requirement 4.8.2.1 .c.2.

2. Credit may be taken for unplanned events that satisfy this surveillance requirement.

The battery capacity is adequate to supply and maintain in OPERABLE status all of the actual or simulated ESF loads for the design duty cycle when the battery is subjected to a battery service test.

d. Not used.

e. Not used.

f. Not used.

SOUTH TEXAS - UNITS 1 & 2 3/48-11 Unit 1 - Amendment No. -4,1-7, 4-0 Unit 2 - Amendment No. 1-66, 67

NO CHANGES ELECTRICAL POWER SYSTEMS DC SOURCES SHUTDOWN LIMITING CONDITION FOR OPERATION 3.8.2.2 DC electrical power subsystem shall be OPERABLE to support the DC electrical power distribution subsystem(s) required by LCO 3.8.3.2, "Onsite Power Distribution -

Shutdown."

APPLICABILITY: MODES 5 and 6 ACTION:

a. With one or more required DC electrical power subsystems inoperable:

1. Immediately declare affected required feature(s) inoperable, OR

2. Immediately:

Initiate action to suspend operation with a potential for draining the reactor vessel, AND Suspend all operations involving CORE ALTERATIONS, operations involving positive reactivity additions that could result in loss of required SHUTDOWN MARGIN or required boron concentration, or movement of irradiated fuel, AND

Initiate corrective action to restore the required DC electrical power subsystems to OPERABLE status as soon as possible.

b. With no battery chargers for a required channel OPERABLE:

1. Restore battery terminal voltage to greater than or equal to the minimum established float voltage within 2 hours2.314815e-5 days 5.555556e-4 hours 3.306878e-6 weeks 7.61e-7 months , AND

2. Verify float current for the affected battery does not exceed 2 amps once per 12 hours1.388889e-4 days 0.00333 hours 1.984127e-5 weeks 4.566e-6 months , AND

3. Restore one battery charger to OPERABLE status within 72 hours8.333333e-4 days 0.02 hours 1.190476e-4 weeks 2.7396e-5 months .

If the battery terminal voltage cannot be restored within the allowed time, float current is excessive, or a battery charger is not restored to operability in the time allowed:

Initiate action to suspend operation with a potential for draining the reactor vessel, AND SOUTH TEXAS - UNITS 1 & 2 3/4 8-12 Unit 1 - Amendment No. -4,--,-7-, 180 Unit 2 - Amendment No. U-66, 167

ELECTRICAL POWER SYSTEMS LIMITING CONDITION FOR OPERATION (continued)

Suspend all operations involving CORE ALTERATIONS, operations involving positive reactivity additions that could result in loss of required SHUTDOWN MARGIN or required boron concentration, or movement of irradiated fuel, AND Initiate corrective action to restore the required DC electrical power subsystems to OPERABLE status as soon as possible.

SURVEILLANCE REQUIREMENTS 4.8.2.2 Each 125-volt battery bank shall be demonstrated OPERABLE:

a. At least once per 7 days by verifying that the total battery terminal voltage is greater than or equal to the minimum established float voltage.

b. At least once per 18 months by verifying that the battery charger can supply at least 300 amperes at greater than or equal to the minimum established float voltage for at least 8 hours9.259259e-5 days 0.00222 hours 1.322751e-5 weeks 3.044e-6 months .

OR Verify each battery charger can recharge the battery to the fully charged state within 12 hours1.388889e-4 days 0.00333 hours 1.984127e-5 weeks 4.566e-6 months while supplying the largest combined demands of the various continuous steady-state loads following a battery discharge to the bounding design-basis event discharge state.

C. NOTE: 1. The modified performance discharge test in SR 4.8.2.3.f may be performed in lieu of Surveillance Requirement 4.8.2.2.c.

2. Credit may be taken for unplanned events that satisfy this surveillance requirement.

At least once per 18 months by verifying that the battery capacity is adequate to supply and maintain in OPERABLE status all of the actual or simulated ESF loads for the design duty cycle when the battery is subjected to a battery service test.

SOUTH TEXAS - UNITS 1 & 2 3/4 8-13 Unit 1 - Amendment No. 4,17--,-80 Unit 2 - Amendment No. !66, !467

ELECTRICAL POWER SYSTEMS LIMITING CONDITION FOR OPERATION (continued)

f. If a battery has one or more battery cells with float voltage < 2.07 volts and float current > 2 amps, declare the associated battery INOPERABLE immediately.

SURVEILLANCE REQUIREMENTS 4.8.2.3. Each 125-volt battery bank and charger shall be demonstrated operable:

a. NOTE: Performance of this surveillance is not required when battery terminal voltage is less than the minimum established float voltage of surveillance requirement 4.8.2.1 .a.

At least once per 7 days, verify the float current for each battery is < 2 amps.

b. At least once per 31 days, verify each battery pilot cell voltage is _>2.07 V on float charge.

c. At least once per 92 days, verify each battery connected cell voltage is _ 2.07 V on float charge.

d. At least once per 31 days, verify each battery connected cell electrolyte level is greater than or equal to minimum established design limits.

e. At least once per 31 days, verify each battery pilot cell temperature is greater than or equal to minimum established design limits.

f. Battery capacity is tested under the following conditions:

1. At least once per 12 months by giving modified performance discharge tests of battery capacity to any battery that shows degradation or reaches 85% of the service life expected for the application with capacity less than 100% of the manufacturer's rating. Degradation is indicated when battery capacity drops more than 10% from its capacity on the previous performance/modified performance discharge test, or is below 90% of the manufacturer's rating; AND

2. At least once per 24 months by giving modified performance discharge tests of battery capacity to any battery reaching 85% of the service life with capacity greater than or equal to 100% of the manufacturer's rating; AND

3. At least once per 60 months by verifying that the battery capacity is at least 80% of the manufacturer's rating when subjected to a modified performance discharge test.

SOUTH TEXAS - UNITS 1 & 2 3/4 8-13c Unit 1 - Amendment No. -,17--,48 Unit 2 - Amendment No. !66, 4167

v t e Letter Sequence Request
TAC:MD7366, (Approved, Closed)
Initiation Request Acceptance... Administration Questions Answers Results Approval, Approval Other: ML081890182, ML081890236
MONTHYEAR2008-06-30 [Table View]

NOC-AE-07002208, Proposed Amendment to Technical Specification 3/4.8.2 to Modify Battery Surveillance Requirements

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3.0 TECHNICAL EVALUATION

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5.0 ENVIRONMENTAL CONSIDERATION

6.0 REFERENCES

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NOC-AE-07002208, Proposed Amendment to Technical Specification 3/4.8.2 to Modify Battery Surveillance Requirements

Text

Enclosure:

Subject:

SUMMARY

SUMMARY

3.0 TECHNICAL EVALUATION

4.0 REGULATORY EVALUATION

5.0 ENVIRONMENTAL CONSIDERATION

6.0 REFERENCES

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