NRC 2004-0034, License Amendment Request 239 Technical Specification Surveillance Requirements SR 3.8.4.6 and SR 3.8.4.7, DC Sources - Operating

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License Amendment Request 239 Technical Specification Surveillance Requirements SR 3.8.4.6 and SR 3.8.4.7, DC Sources - Operating
ML041040015
Person / Time
Site: Point Beach  NextEra Energy icon.png
Issue date: 04/08/2004
From: Vanmiddlesworth G
Nuclear Management Co
To:
Document Control Desk, Office of Nuclear Reactor Regulation
References
NRC 2004-0034
Download: ML041040015 (30)
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Text

NMC Committed to Nuclear Excellence Point Beach Nuclear Plant Operated by Nuclear Management Company, LLC April 8, 2004 NRC 2004-0034 10 CFR 50.90 U.S. Nuclear Regulatory Commission ATTN: Document Control Desk Washington, DC 20555 Point Beach Nuclear Plant, Units 1 and 2 Dockets 50-266 and 50-301 License Nos. DPR-24 and DPR-27 License Amendment Request 239 Technical Specification Surveillance Requirements SR 3.8.4.6 and SR 3.8.4.7, DC Sources - Operating In accordance with the provisions of 10 CFR 50.90, Nuclear Management Company, LLC (NMC), is submitting a request for an amendment to the Technical Specifications (TS) for Point Beach Nuclear Plant, Units 1 and 2.

The proposed amendment would revise TS Surveillance Requirements (SR) 3.8.4.6 and SR 3.8.4.7, DC Sources - Operating, to revise the values for battery charger currents, add a new allowance for the method of verifying battery charger capacity, and remove a restriction on the conduct of a modified performance discharge test. The proposed changes are based on NUREG-1431, Standard Technical Specifications, Westinghouse Plants, Revision 2.

Enclosure I provides a description and analysis of the proposed change. Enclosure II provides the existing TS pages marked up to show the proposed change. Enclosure IlIl provides the existing TS Bases pages marked up to reflect the proposed change.

Enclosure IV provides revised (clean) TS pages.

NMC requests approval of the proposed license amendment by April 2005, with the amendment being implemented within 45 days. The approval date was administratively selected to allow for NRC review but the plant does not require this amendment to allow continued safe full power operation.

This letter contains no new commitments or revisions to existing commitments.

In accordance with 10 CFR 50.91, a copy of this application, with attachments, is being provided to the designated Wisconsin Official.

6590 Nuclear Road

  • Two Rivers, Wisconsin 54241 Telephone: 920.755.2321

Document Control Desk Page 2 I declare under penalty of perjury that the foregoing is true and correct.

Executed on April 8, 2004.

Gary D. Van Middlesworth Site Vice-President, Point Beach Nuclear Plant Nuclear Management Company, LLC

Enclosures:

I - Description and Analysis of Change 11 - Proposed Technical Specification Changes IIl - Proposed Technical Specification Bases Changes IV - Revised Technical Specification and Bases Pages cc: Project Manager, Point Beach Nuclear Plant, NRR, USNRC Regional Administrator, Region 111, USNRC NRC Resident Inspector - Point Beach Nuclear Plant PSCW

ENCLOSURE I DESCRIPTION AND ANALYSIS OF CHANGE LICENSE AMENDMENT REQUEST 239 TECHNICAL SPECIFICATION SURVEILLANCE REQUIREMENTS SR 3.8.4.6 AND SR 3.8.4.7, DC SOURCES - OPERATING POINT BEACH NUCLEAR PLANT, UNITS I AND 2

1.0 INTRODUCTION

This License Amendment Request (LAR) is made pursuant to 10 CFR 50.90 to modify Technical Specification (TS) Surveillance Requirements (SR) 3.8.4.6 and SR 3.8.4.7, DC Sources - Operating, to revise the values for battery charger currents, add a new allowance for the method of verifying battery charger capacity, and remove a restriction on the conduct of a modified performance discharge test.

2.0 BACKGROUND

The station DC electrical power system provides the AC emergency power system with control power. It also provides both motive and control power to selected safety related equipment and preferred AC vital instrument bus power (via inverters). As required by the Point Beach Design Criteria, the DC electrical power system is designed to have sufficient independence, redundancy, and testability to perform its safety functions, assuming a single failure.

The safety-related 125 VDC system consists of four main distribution buses: D01, D02, D03, and D04, in addition to two swing buses (D301 and D302) each capable of supplying one of the four 125 VDC buses.

Each of the four main distribution buses is powered by a battery charger (D07, D08, D107 and D108) and a station battery (DO5, D06, D105, and D106). The function of the battery chargers is to supply their respective DC loads, while maintaining the batteries at full charge. All of the battery chargers are powered from the 480 VAC Engineered Safety Feature (ESF) system.

The battery chargers are interlocked such that a loss of offsite power will disconnect the battery chargers from their 480 VAC source. A coincident safety injection signal would prevent restoration of the battery chargers unless offsite power is restored to the safeguards buses. This limits the loading on the standby emergency power supply during the period immediately following a safety injection signal. During this period, the 125 VDC loads are supplied by their associated station battery until such time as power to the chargers is restored.

Page 1 of 10

Two swing battery chargers are available through one of the swing DC distribution buses. Swing charger D09 is connected to swing DC distribution bus D301 and can provide a source of DC power to distribution buses D01 or D02.

Likewise, swing charger D109 is connected to swing DC distribution bus D302 and can provide a source of DC power to distribution buses D03 or D04. In addition, there exists a swing safety-related battery D305 which is connected to swing DC distribution bus D301. This swing battery is capable of being aligned to any one of the four main distribution buses to take the place of the normal battery. Interlocks exist on swing DC distribution buses D301 and D302 which prevent the paralleling of redundant DC buses.

The station batteries have been sized to carry their expected shutdown loads following a plant trip/LOCA and loss of offsite power, or following a station blackout for a period of one hour, without battery terminal voltage falling below 105 volts (for battery considerations) and while maintaining voltage at the fed components sufficient for them to operate. Load profiles for batteries D05, D06 and D305 are shown in Final Safety Analysis Report (FSAR) Figure 8.7-2 and for batteries D105 and D106 in FSAR Figure 8.7-3. The swing station battery, D305, has been sized to provide an equivalent voltage at each of the four main DC buses. The swing battery chargers and the swing battery allow the normally on-line battery chargers and batteries to be removed from service for maintenance or testing that can not be performed with the equipment on-line.

Each 125 VDC battery is separately housed in a ventilated room apart from its charger and distribution centers. Each subsystem is located in an area separated physically and electrically from the other subsystem to ensure that a single failure in one subsystem does not cause a failure in a redundant subsystem. There is no sharing between redundant Class 1E distribution subsystems.

The batteries are sized to produce required capacity at 80% of nameplate rating, corresponding to warranted capacity at end of life cycles and the 100% design demand. Battery size is based on 125% of required capacity. The minimum voltage limit is 2.13 V per cell; however, to ensure that the battery is maintained in a charged state, the charger voltage is maintained greater than 129.8 V for batteries D05 and D06 (59 cell batteries), and 132.0 V for batteries D105 and D106 (60 cell batteries). This corresponds to a minimum nominal cell voltage of 2.20 V per cell. The criteria for sizing large lead storage batteries are defined in IEEE-485.

Each DC electrical power subsystem has ample power output capacity for the steady state operation of connected loads required during normal operation, while at the same time maintaining its battery bank fully charged. Each battery charger also has sufficient capacity to restore the battery from the design minimum charge to its fully charged state within 24 hours2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br /> while supplying normal steady state loads as discussed in the FSAR, Chapter 8.7.

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System License Basis The initial conditions of Design Basis Accident (DBA) and transient analyses in the FSAR, Chapter 14, assume that Engineered Safety Feature (ESF) systems are OPERABLE. The DC electrical power system provides normal and emergency DC electrical power for the standby emergency power sources, emergency auxiliaries, and control and switching during all MODES of operation.

The OPERABILITY of the DC sources is consistent with the initial assumptions of the accident analyses and is based upon meeting the design basis of the unit.

This includes maintaining the DC sources OPERABLE during accident conditions in the event of:

a. An assumed loss of all offsite AC power or all onsite AC power; and
b. A worst case single failure.

3.0 PROPOSED CHANGE

AND JUSTIFICATION The proposed amendment would modify Technical Specification (TS)

Surveillance Requirements (SR) 3.8.4.6 and SR 3.8.4.7, DC Sources -

Operating, to revise the values for battery charger currents, add a new allowance for the method of verifying battery charger capacity, and remove a restriction on the conduct of a modified performance discharge test. Certain amperage values currently specified in SR 3.8.4.6 had been found to be inconsistent with the assumptions that were used for battery loading and associated charging time as stated in the TS Bases. This change clarifies the loading assumptions and corrects the discrepancy between the TS Bases and the PBNP Final Safety Analysis Report (FSAR).

SR 3.8.4.6 is proposed for modification as follows (deletions are marked as strikethrough, additions are double-underlined).

Verify battery chargers D-07, D-08, and D-09 each supply -203320amps at greater than or equal to the minimum established float voltaae s-1-25 V for 2 8 hours9.259259e-5 days <br />0.00222 hours <br />1.322751e-5 weeks <br />3.044e-6 months <br />, and battery chargers D-1 07, D-108, and D-109 each-supply Ž-27-3 420 amps at greater than or equal to the minimum established float voltage 125 V for 2 8 hours9.259259e-5 days <br />0.00222 hours <br />1.322751e-5 weeks <br />3.044e-6 months <br />.

Verify each battery charger can recharge the battery to the fully charged state within 24 hours2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br /> while carrying normal loads, after a battery dischargetothe bounding design basis event discharge state.

SR 3.8.4.6 verifies that battery chargers D-07, D-08, and D-09 are each capable of supplying 320 amps and that battery chargers D-107, D-108, and D-109 are Page 3 of 10

each capable of supplying 420 amps, for a period of eight hours. These requirements are based on the design capacity of the chargers. Battery chargers D-07, D-08, and D-09 are rated at 350 amps (current limit setpoint), while battery chargers D-107, D-108, and D-109 are rated at 450 amps (current limit setpoint).

The required minimum amperage value for each battery charger was selected to be 30 amps below its respective current limit setpoint. This provides margin between the rated value of the charger and the surveillance requirements. The proposed change replaces the previous amperage values with the appropriate specification for all six battery chargers.

Additionally, the specified voltage value (125 V) is being replaced by the phrase,

'minimum established float voltage'. The specific limiting value for the minimum operating battery charging float voltage is relocated to the Bases, which are under the change control of 10 CFR 50.59. The TS will require the battery charger to supply battery terminal voltage "greater than or equal to the minimum established float voltage". The battery manufacturer establishes this voltage to provide the optimum charge on the battery. This voltage will maintain the battery plates in a condition that supports maintaining the grid life. As such, the "minimum established float voltage" can be adequately controlled outside of the TS. This phraseology is consistent with Standard TS (NUREG-1431).

Additionally, battery cell minimum float voltage limits are specified in TS 3.8.6.

An additional allowance is proposed as an alternative method for satisfying SR 3.8.4.6. The alternate acceptance criteria would allow an actual inservice demonstration that the charger can recharge the battery to the fully charged state within 24 hours2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br /> while supplying normal loads, after a battery discharge to the bounding design basis event discharge state. This loading is based on the battery charger sizing criteria as specified in PBNP FSAR Section 8.7.2. The proposed allowance meets the intent of the existing test and allows for normal in-place demonstration of the charger capability, thereby minimizing the time when the charger would be disconnected from the DC bus. This additional allowance is consistent with the Standard TS.

The Note in SR 3.8.4.7. is proposed for modification as follows (deletions are marked as strikethrough).

NOTES -------------------------

The modified performance discharge test in SR 3.8.4.8 may be performed in lieu of the srewicctt iestn SR 3.8.4.7 oRce pcr 60 MO7thc.

The 'once per 60 months' restriction on replacing the battery service test with the battery modified performance discharge test is eliminated. Since the modified performance discharge test completely encompasses the load profile of the battery service test, it adequately confirms the intent of the service test to verify the battery capacity to supply the design basis load profile.

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Technical Specification Bases changes are also being made to reflect the proposed Technical Specifications changes, provide additional clarification, and to correct editorial errors in references.

A statement in the TS Bases, which is being clarified, implied that a loss of offsite power would also need a coincident safety injection signal to disconnect the battery chargers from their 480 VAC source. A loss of offsite power alone will accomplish this disconnect. The system design is such that a coincident safety injection signal would prevent restoration of the battery chargers unless offsite power is restored to the safeguards buses. This limits the loading on the standby emergency power supply during the period immediately following a safety injection signal. The TS Bases are being revised to clarify this description.

An additional change to the Background Section of the TS Bases corrects the cell and battery voltage limits to appropriately reflect the lead-calcium batteries used at PBNP.

The proposed changes are based on NUREG-1431, Standard Technical Specifications, Westinghouse Plants, Revision 2.

4.0 ANALYSIS The D-01, D-02, D-03 and D-04 DC electrical power subsystems, each subsystem consisting of battery, battery charger, and the corresponding control equipment and interconnecting cabling supplying power to the associated bus, are required to be OPERABLE to ensure the availability of the required power to shut down the reactor and maintain it in a safe condition after an anticipated operational occurrence or a postulated DBA. Loss of any DC electrical power subsystem does not prevent the minimum safety function from being performed.

An OPERABLE DC electrical power subsystem requires all required batteries and respective chargers to be operating and connected to the associated DC bus(es).

One battery charger is in service on each battery so that the batteries are always at full charge in anticipation of a loss of AC power event. This ensures that adequate DC power is available to initiate the starting of the emergency generators and other emergency uses. Additionally, a connected battery will filter the output of its associated charger. The swing battery chargers and the swing battery allow the normally online battery chargers and batteries to be removed from service for maintenance that cannot be performed with the equipment online.

SR 3.8.4.6 verifies the design capacity of the battery chargers. According to PBNP FSAR 8.7, the battery charger supply is sized to recharge its respective partially discharged battery within 24 hours2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br /> while carrying normal loads. The Page 5 of 10

minimum required amperes and duration ensure that these requirements can be satisfied.

SR 3.8.4.6, as proposed, provides two options. One option requires that battery chargers D-07, D-08, and D-09 be capable of supplying 320 amps at the minimum established float voltage for 8 hours9.259259e-5 days <br />0.00222 hours <br />1.322751e-5 weeks <br />3.044e-6 months <br />, and battery chargers D-1 07, D-1 08, and D-1 09 be capable of supplying 420 amps at the minimum established float voltage for eight hours. The ampere and voltage requirements are based on the design capacity of the chargers. The time period is sufficient for the charger temperature to stabilize and to have been maintained for at least two hours.

The other option requires that each battery charger be capable of recharging the battery after a service test, coincident with supplying normal loads. The duration for this test may be longer than the charger design capacity test discussed in the first option since the battery recharge is affected by float voltage, temperature, and the exponential decay in charging current. The battery is recharged when the measured charging current is two amps.

SR 3.8.4.7 is a battery service test. This is a special test of battery capability, as found, to satisfy the design requirements (battery duty cycle) of the DC electrical power system. The discharge rate and test length should correspond to the design duty cycle requirements as specified in the FSAR analyses.

The Surveillance Frequency of 18 months is consistent with the recommendations of Regulatory Guide 1.32, and Regulatory Guide 1.129.

SR 3.8.4.7 is modified by a Note which allows the performance of a modified performance discharge test (as per SR 3.8.4.8) in lieu of a service test. This allowance is acceptable because the modified performance discharge test completely encompasses the load profile of the battery service test. Therefore, it adequately confirms the intent of the service test to verify the battery capacity to supply the design basis load profile.

SR 3.8.4.8 is a battery performance discharge test. This 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 determined by the acceptance test. The test is intended to determine overall battery degradation due to age and usage.

Either the battery performance discharge test or the modified performance discharge test is acceptable for satisfying SR 3.8.4.8; however, only the modified performance discharge test may be used to satisfy SR 3.8.4.8 while satisfying the requirements of SR 3.8.4.7 at the same time.

A modified discharge test is a test of the battery capacity and its ability to provide a high rate, short duration load (usually the highest rate of the duty cycle). This Page 6 of 10

will often confirm the battery's ability to meet the critical period of the load duty cycle, in addition to determining its percentage of rated capacity. Initial conditions for the modified performance discharge test should be identical to those specified for a service test.

The modified performance discharge test is a simulated duty cycle consisting of just two rates; the one minute rate published for the battery or the largest current load of the duty cycle, followed by the test rate employed for the performance test, both of which envelope the duty cycle of the service test. Since the ampere-hours removed by a rated one minute discharge represents a very small portion of the battery capacity, the test rate can be changed to that for the performance test without compromising the results of the performance discharge test. The battery terminal voltage for the modified performance discharge test should remain above the minimum battery terminal voltage specified in the battery service test for the duration of time equal to that of the service test.

The acceptance criteria for SR 3.8.4.8 are consistent with IEEE-450 and IEEE-485. These references recommend that the battery be replaced if its capacity is below 80% of the manufacturer's rating. A capacity of 80% shows that the battery rate of deterioration is increasing, even if there is ample capacity to meet the load requirements.

The Surveillance Frequency for this test is normally 60 months. If the battery shows degradation, or if the battery has reached 85% of its expected life and capacity is < 100% of the manufacturer's rating, the Surveillance Frequency is reduced to 12 months. However, if the battery shows no degradation but has reached 85% of its expected life, the Surveillance Frequency is only reduced to 24 months for batteries that retain capacity 2 100% of the manufacturer's rating.

Degradation is indicated, according to IEEE-450, when the battery capacity drops by more than 10% relative to its capacity on the previous performance test or when it is 2 10% below the manufacturer's rating. These frequencies are consistent with the recommendations in IEEE-450.

5.0 REGULATORY ANALYSIS

5.1 No Significant Hazards Determination In accordance with the requirements of 10 CFR 50.90, Nuclear Management Company (licensee) hereby requests amendments to facility operating licenses DPR-24 and DPR-27, for Point Beach Nuclear Plant, Units 1 and 2, respectively.

The purpose of the proposed amendments is to modify Technical Specification (TS) Surveillance Requirements (SR) 3.8.4.6 and SR 3.8.4.7, DC Sources -

Operating, to revise the values for battery charger currents, add a new allowance for the method of verifying battery charger capacity, and remove a restriction on the conduct of a modified performance discharge test.

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Nuclear Management Company has evaluated the proposed amendments in accordance with 10 CFR 50.91 against the standards in 10 CFR 50.92 and has determined that the operation of the Point Beach Nuclear Plant in accordance with the proposed amendments presents no significant hazards. The NMC evaluation against each of the criteria in 10 CFR 50.92 follows.

1. Operation of the Point Beach Nuclear Plant in accordance with the proposed amendments does not result in a significant increase in the probability or consequences of any accident previously evaluated.

The DC electrical power system provides normal and emergency DC electrical power for the standby emergency power sources, emergency auxiliaries, and control and switching during all Modes of operation.

SR 3.8.4.6 verifies the design capacity of the battery chargers. SR 3.8.4.7 demonstrates the design requirements (battery duty cycle) of the DC electrical power system. The proposed amendment corrects a discrepancy between the TS Bases and FSAR and better aligns the PBNP TS with the standard TS, which will enhance plant safety. Other proposed changes are bounded by different TS requirements or existing analyses contained in the FSAR, meet the intent of the existing tests, and do not result in relaxation of the underlying requirements.

The proposed change does not involve any hardware changes, nor does it affect the probability of any event initiators. There will be no change to normal plant operating parameters, engineered safety feature actuation setpoints, accident mitigation capabilities, or accident analysis assumptions or inputs.

Therefore, the probability or consequences of any accident previously evaluated will not be significantly increased as a result of the proposed change.

2. Operation of the Point Beach Nuclear Plant in accordance with the proposed amendments does not result in a new or different kind of accident from any accident previously evaluated.

No new accident scenarios, transient precursors, failure mechanisms, or limiting single failures are introduced as a result of the proposed change. The revised surveillance requirements will continue to assure equipment reliability such that plant safety is maintained or will be enhanced.

Equipment important to safety will continue to operate as designed. The changes do not result in any event previously deemed incredible being made credible. The changes do not result in adverse conditions or result in any increase in the challenges to safety systems. Therefore, operation of the Page 8 of 10

Point Beach Nuclear Plant in accordance with the proposed amendment will not create the possibility of a new or different type of accident from any accident previously evaluated.

3. Operation of the Point Beach Nuclear Plant in accordance with the proposed amendments does not result in a significant reduction in a margin of safety.

The DC electrical power system provides normal and emergency DC electrical power for the standby emergency power sources, emergency auxiliaries, and control and switching during all Modes of operation.

SR 3.8.4.6 verifies the design capacity of the battery chargers. SR 3.8.4.7 demonstrates the design requirements (battery duty cycle) of the DC electrical power system. The proposed change to these SRs continues to assure that design requirements of the DC electrical power system continue to be met. There will be no change to the departure from nucleate boiling ratio (DNBR) correlation limit, the design DNBR limits, or the safety analysis DNBR limits.

There are no new or significant changes to the initial conditions contributing to accident severity or consequences. The proposed amendment will not otherwise affect the plant protective boundaries, will not cause a release of fission products to the public, nor will it degrade the performance of any other structures, systems or components (SSCs) important to safety. Therefore, the requested change will not result in a significant reduction in the margin of safety.

Conclusion Operation of the Point Beach Nuclear Plant in accordance with the proposed amendment will not result in a significant increase in the probability or consequences of any accident previously analyzed; will not result in a new or different kind of accident from any accident previously analyzed; and, does not result in a significant reduction in any margin of safety. Therefore, operation of the Point Beach Nuclear Plant in accordance With the proposed amendment does not result in a significant hazards determination.

5.2 Applicable Regulatory Requirements Point Beach was licensed prior to the 1971 publication of Appendix A, "General Design Criteria for Nuclear Power Plants", (GDC) to 10 CFR Part 50. As such, Point Beach is not licensed to the GDC. The Point Beach Final Safety Analysis Report (FSAR), Section 1.3, lists the plant-specific GDC to which the plant was licensed. The Point Beach GDC are similar in content to the draft GDC proposed for public comment in 1967. The Point Beach GDC affecting the 125 VDC System are Point Beach GDC-2 and 39. The applicable criteria for this system Page 9 of 10

are discussed in FSAR Section 8.7, 125 VDC Electrical Distribution System, and 10 CFR 50.49, "Environmental Qualification of Electric Equipment Important to Safety for Nuclear Power Plants".

Point Beach GDC-2, "Performance Standards" requires, in part, that systems be designed to performance standards that enable such systems to withstand the forces that might reasonably be imposed by the occurrence of an extraordinary natural phenomenon. Point Beach GDC-39, "Emergency Power", requires, in part, that an emergency power source shall be provided and designed with adequate independency, redundancy, capacity, and testability to permit the functioning of the engineered safety features and protection systems. This power source shall provide this capacity assuming a failure of a single active component. The technical analysis in Section 4.0 above, concludes that the proposed changes to TS SR 3.8.4.6 and SR 3.8.4.7 will continue to assure that the design requirements of the DC electrical power system are met. The proposed changes will not affect the other requirements of these criteria.

Surveillance Requirements (SRs), per 10 CFR 50.36(c)(3), are "...to assure that the necessary quality of systems and components is maintained, that facility operation will be within safety limits, and that the limiting conditions for operation will be met." The technical analysis performed by NMC concludes that the proposed changes to TS SR 3.8.4.6 and SR 3.8.4.7 will provide added plant operational flexibility without a corresponding reduction in plant safety margins.

NMC concludes that the proposed changes are in accordance with 10 CFR 50.36(c)(3) with regards to maintaining the necessary quality of systems and components, sustaining facility operation within safety limits, and meeting the limiting conditions for operation. These changes also continue to meet the requirements stated in the PBNP FSAR and the requirements of 10 CFR 50.46.

The proposed changes thus continue to be compliant with the above regulatory requirements.

5.3 Commitments There are no actions committed to by NMC in this document. The statements in this submittal are provided for information purposes and are not considered to be commitments.

6.0 ENVIRONMENTAL EVALUATION NMC has determined that the information for the proposed amendment does not involve a significant hazards consideration, authorize a significant change in the types or total amounts of effluent release, or result in any significant increase in individual or cumulative occupational radiation exposure. Therefore, NMC concludes that the proposed amendment meets the categorical exclusion requirements of 10 CFR 51.22(c)(9) and that an environmental impact appraisal need not be prepared.

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ENCLOSURE II PROPOSED TECHNICAL SPECIFICATION CHANGES LICENSE AMENDMENT REQUEST 239 TECHNICAL SPECIFICATION SURVEILLANCE REQUIREMENTS SR 3.8.4.6 AND SR 3.8.4.7, DC SOURCES - OPERATING POINT BEACH NUCLEAR PLANT, UNITS I AND 2 (2 pages follow)

DC Sources-Operating 3.8.4 SURVEILLANCE REQUIREMENTS (continued)

SURVEILLANCE FREQUENCY SR 3.8.4.2 Verify no visible corrosion at battery terminals 92 days and connectors.

OR Verify battery connection resistance is within limits.

SR 3.8.4.3 Verify battery cells, cell plates, and racks show 12 months no visual indication of physical damage or abnormal deterioration that could degrade battery performance.

SR 3.8.4.4 Remove visible terminal corrosion, and verify 12 months battery cell to cell and terminal connections are coated with anti-corrosion material.

SR 3.8.4.5 Verify battery connection resistance is within 12 months limits.

SR 3.8.4.6 Verify battery chargers D-07, D-08, and D-09 each 18 months supply Ž-203 320amps at greater than or equalto the minimum established float voltage 125-V for 2 8 hours9.259259e-5 days <br />0.00222 hours <br />1.322751e-5 weeks <br />3.044e-6 months <br />, and battery chargers D-107, D-108, and D-1 09 each-supply Ž-27-3 420amps at greater than or equal to the minimum established float volta 25 V for 2 8 hours9.259259e-5 days <br />0.00222 hours <br />1.322751e-5 weeks <br />3.044e-6 months <br />.

OR Verify each battery charger can recharae the battery to the fully charged state within 24 hours2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br /> while carrying normal loads, after a battery dischargetothe bounding design basis event discharge sta.

(continued)

Point Beach 3.8.4-2 Unit 1 - Amendment No. 201 Unit 2 - Amendment No. 206

DC Sources-Operating 3.8.4 SURVEILLANCE REQUIREMENTS (continued)

SURVEILLANCE FREQUENCY SR 3.8.4.7 -------------------------

NOTES-------------------------

The modified performance discharge test in SR 3.8.4.8 may be performed in lieu of the service test in SR 3.8.4.7 none per 60 mnRths.

I Verify battery capacity is adequate to supply, 18 months and maintain in OPERABLE status, the required emergency loads for the design duty cycle when subjected to a battery service test.

SR 3.8.4.8 Verify battery capacity is 2 80% of the 60 months manufacturer's rating when subjected to a performance discharge test or a modified AND performance discharge test.

12 months when battery shows degradation or has reached 85% of expected life with capacity

< 100% of manufacturer's rating AND 24 months when battery has reached 85% of the expected life with capacity 2 100% of manufacturer's rating Point Beach 3.8.4-3 Unit 1 - Amendment No. 201 Unit 2 - Amendment No. 206

ENCLOSURE III PROPOSED TECHNICAL SPECIFICATION BASES CHANGES LICENSE AMENDMENT REQUEST 229 TECHNICAL SPECIFICATION SURVEILLANCE REQUIREMENTS SR 3.8.4.6 AND SR 3.8.4.7, DC SOURCES - OPERATING POINT BEACH NUCLEAR PLANT, UNITS 1 AND 2 (6 pages follow)

DC Sources-Operating B 3.8.4 B 3.8 ELECTRICAL POWER SYSTEMS B 3.8.4 DC Sources-Operating BASES BACKGROUND The station DC electrical power system provides the AC emergency power system with control power. It also provides both motive and control power to selected safety related equipment and preferred AC vital instrument bus power (via inverters). As required by the Point Beach Design Criteria (Ref. 1), the DC electrical power system is designed to have sufficient independence, redundancy, and testability to perform its safety functions, assuming a single failure.

The safety-related 125 VDC system consists of four main distribution buses: D01, D02, D03, and D04, in addition to two swing buses (D301 and D302) each capable of supplying one of the four 125 VDC buses.

Each of the four main distribution buses is powered by a battery charger (D07, D08, D107 and D108) and a station battery (DO5, D06, D105, and D106). The function of the battery chargers is to supply their respective DC loads, while maintaining the batteries at full charge. All of the battery chargers are powered from the 480 VAC Engineered Safety Feature (ESF) system.

The battery chargers are interlocked such that a loss of offsite power combined with a safety injection signal will disconnect the battery chargers from their 480 VAC source. A coincident safety injection signal would prevent restoration of the battery chargers unless offsite power is restored to the safeguards buses. This limits the loading on the standby emergency power supply during the period immediately following a safety injection signal. During this period, the 125 VDC loads are supplied by their associated station battery until such time as power to the chargers is restored.

Two swing battery chargers are available through one of the swing DC distribution buses. Swing charger D09 is connected to swing DC distribution bus D301 and can provide a source of DC power to distribution buses D01 or D02. Likewise, swing charger D109 is connected to swing DC distribution bus D302 and can provide a source of DC power to distribution buses D03 or D04. In addition, there exists a swing safety-related battery D305 which is connected to swing DC distribution bus D301. This swing battery is capable of being aligned to any one of the four main distribution buses to take the place of the normal battery. Interlocks exist on swing DC distribution buses D301 and D302 which prevent the paralleling of redundant DC buses.

The station batteries have been sized to carry their expected shutdown Point Beach B 3.8.4-1 Unit 1 - Amendment No. 201 Unit 2 - Amendment No. 206

DC Sources-Operating B 3.8.4 BASES BACKGROUND loads following a plant trip/LOCA and loss of offsite power, or following (continued) a station blackout for a period of one hour, without battery terminal voltage falling below 105 volts (for battery considerations) and while maintaining voltage at the fed components sufficient for them to operae Major battery loads, with their approximate operating times.

are listed in FSAR Table 8.7 1 Load profiles for batteries D05. D06 and D305 are shown in FSAR Figure 8.7-2 and for batteries D105 and D106 in FSAR Figure 8.7-3 (Ref. 2). The swing station battery, D305, has been sized to provide an equivalent voltage at each of the four main DC buses. The swing battery chargers and the swing battery allow the normally on-line battery chargers and batteries to be removed from service for maintenance or testing that can not be performed with the equipment on-line.

Each 125 VDC battery is separately housed in a ventilated room apart from its charger and distribution centers. Each subsystem is located in an area separated physically and electrically from the other subsystem to ensure that a single failure in one subsystem does not cause a failure in a redundant subsystem. There is no sharing between redundant Class 1E distribution subsystems.

The batteries are sized to produce required capacity at 80% of nameplate rating, corresponding to warranted capacity at end of life cycles and the 100% design demand. Battery size is based on 125% of required capacity. The voltage limit is 2.13 V per cell; however, to ensure that the battery is maintained in a charged state, the cha voltage is maintained greater than 129.8 V for batteries D05 and D06 (59 cell batteries), and 132.0 V for batteries D105 and D106 (60 cell batteries). This corresponds to a minimum nominal cell voltaae of 2.20 V minimum cell voltage is 2.17 V per cell, which corresponds to a minimum voltage of 128 V for batteries D05 and D06, and 130.2 V for batteries D105 and Di 06. The criteria for sizing large lead storage batteries are defined in IEEE-450 485 (Ref. 63).

Each DC electrical power subsystem has ample power output capacity for the steady state operation of connected loads required during normal operation, while at the same time maintaining its battery bank fully charged. Each battery charger also has sufficient capacity to restore the battery from the design minimum charge to its fully charged state within 24 hours2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br /> while supplying normal steady state loads discussed in the FSAR, Chapter 8.7 (Ref. 2).

APPLICABLE The initial conditions of Design Basis Accident (DBA) and transient SAFETY ANALYSES analyses in the FSAR, Chapter 14 (Ref. 4), assume that Engineered Safety Feature (ESF) systems are OPERABLE. The DC electrical power system provides normal and emergency DC electrical power for Point Beach B 3.8.4-2 Unit 1 - Amendment No. 201 Unit 2 - Amendment No. 206

DC Sources-Operating B 3.8.4 BASES SURVEILLANCE SR 3.8.4.4 and SR 3.8.4.5 REQUIREMENTS (continued) Visual inspection and resistance measurements of inter-cell, inter-rack, inter-tier, and terminal connections provide an indication of physical damage or abnormal deterioration that could indicate degraded battery condition. The anticorrosion material is used to help ensure good electrical connections and to reduce terminal deterioration. The visual inspection 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 3.8.4.4.

The connection resistance limits for SR 3.8.4.5 shall be no more than 20% above the resistance as measured during installation, or not above the ceiling value established by the manufacturer.

The Surveillance Frequencies of 12 months is consistent with IEEE-450 (Ref. 6), which recommends cell to cell and terminal connection resistance measurement on a yearly basis.

SR 3.8.4.6

[Existing first section moved to next paragraphlThis SR verifies the design capacity of the battery chargers. According to Regulatofy Guide 1.32 FSAR 8.7 (Ref. :72), the battery charger supply is required sized to recharge its respective partially discharged battery within 24 hours2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br /> while carrying normal loads be based on the largest combincd demands of the rious steady state loads -nd the charginRg capaity to restore the battery from the design minimum charge state to the fully charged state, irrespective of the status of the uRit durFiR these demand occurrences. The minimum required amperes and duration ensures that these requirements can be satisfied.

This SR provides two options. One option requires that battery chargers D-07, D-08, and D-09 be capable of supplying 2X3320 amps at the minimum established float voltaae 425-V-for :-8 hours, and battery chargers D-107, D-108, and D-109 be capable of supplying 2-73 42 amps at the minimum established float voltage 25 for :-8 hours.

These ampere and voltage requirements are based on the design capacity of the chargers (Ref. 2). The amperaae requirements are based on the chargers' maximum current limit with a 30 amp maraint the respective chargers' current limit setpoint. The time period is sufficient for the charger temperature to have stabilized and to have been maintained for at least 2 hours2.314815e-5 days <br />5.555556e-4 hours <br />3.306878e-6 weeks <br />7.61e-7 months <br />.

Point Beach B 3.8.4-6 Unit 1 - Amendment No. 201 Unit 2 - Amendment No. 206

DC Sources-Operating B 3.8.4 BASES The other option requires that each battery charger be capable of recharging the battery after a service test, coincident with supplying normal loads. The duration for this test may be lonoer than the charger design capacity test discussed in the first option since the battery recharge is affected by float voltage, temperature, and the exponential decay in charging current. The battery is recharged when the measured charging current is 2 amps.

SR 3.8.4.7 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 discharge rate and test length should correspond to the design duty cycle requirements as specified in Reference 2.

The Surveillance Frequency of 18 months is consistent with the recommendations of Regulatory Guide 1.32 (Ref. 7) and Regulatory Guide 1.129 (Ref. 8).

Point Beach B 3.8.4-7 Unit 1 - Amendment No. 201 Unit 2 - Amendment No. 206

DC Sources-Operating B 3.8.4 BASES SURVEILLANCE This SR is modified by a Note which allows the performance of a REQUIREMENTS modified performance discharge test in lieu of a service test-once-per (continued) 60 months.

The modified performance discharge test is a simulated duty cycle consisting of just two rates; the one minute rate published for the battery or the largest current load of the duty cycle, followed by the test rate employed for the performance test, both of which envelope the duty cycle of the service test. Since the ampere-hours removed by a rated one minute discharge represents a very small portion of the battery capacity, the test rate can be changed to that for the performance test without compromising the results of the performance discharge test. The battery terminal voltage for the modified performance discharge test should remain above the minimum battery terminal voltage specified in the battery service test for the duration of time equal to that of the service test. [This paragraph is moved to the Bases for SR 3.8.4.8 as indicated therein (after the paragraph below)1 A modified discharge test is a test of the battery capacity and its ability to provide a high rate, short duration load (usually the highest rate of the duty cycle). This will often confirm the battery's ability to meet the critical period of the load duty cycle, in addition to determining its percentage of rated capacity. Initial conditions for the modified performance discharge test should be identical to those specified for a service test. [This paragraph is moved to SR 3.8.4.8 (before above)]

SR 3.8.4.8 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 determined by the acceptance test. The test is intended to determine overall battery degradation due to age and usage.

A battery modified performance discharge test is described in the Bases for SR 3.8.1.7. Either the battery performance discharge test or the modified performance discharge test is acceptable for satisfying SR 3.8.4.8; however, only the modified performance discharge test may be used to satisfy SR 3.8.4.8 while satisfying the requirements of SR 3.8.4.7 at the same time.

[Insert specified items from SR 3.8.4.71 The acceptance criteria for this Surveillance are consistent with IEEE-450 (Ref. 6) and IEEE-485 (Ref. 3). These references recommend that the battery be replaced if its capacity is below 80% of the manufacturer's rating. A capacity of 80% shows that the battery Point Beach B 3.8.4-8 Unit 1 - Amendment No. 201 Unit 2 - Amendment No. 206

DC Sources-Operating B 3.8.4 BASES SURVEILLANCE rate of deterioration is increasing, even if there is ample capacity to REQUIREMENTS meet the load requirements.

(continued)

The Surveillance Frequency for this test is normally 60 months. If the battery shows degradation, or if the battery has reached 85% of its expected life and capacity is < 100% of the manufacturer's rating, the Surveillance Frequency is reduced to 12 months. However, if the battery shows no degradation but has reached 85% of its expected life, the Surveillance Frequency is only reduced to 24 months for batteries that retain capacity 2 100% of the manufacturer's rating. Degradation is indicated, according to IEEE-450 (Ref. 6), when the battery capacity drops by more than 10% relative to its capacity on the previous performance test or when it is 2 10% below the manufacturer's rating.

These Frequencies are consistent with the recommendations in IEEE-450 (Ref. 6).

REFERENCES 1. FSAR. Chapter 8.0.

2. FSAR. Chapter 8.7.
3. IEEE-485-1978.
4. FSAR. Chapter 14.
5. Regulatory Guide 1.93, December 1974.
6. IEEE-450-1987.
7. Regulatory Guide 1.32, February 1977.
8. Regulatory Guide 1.129, December 1974.

Point Beach B 3.8.4-9 Unit 1 - Amendment No. 201 Unit 2 - Amendment No. 206

ENCLOSURE IV REVISED TECHNICAL SPECIFICATION PAGES LICENSE AMENDMENT REQUEST 239 TECHNICAL SPECIFICATION SURVEILLANCE REQUIREMENTS SR 3.8.4.6 AND SR 3.8.4.7, DC SOURCES - OPERATING POINT BEACH NUCLEAR PLANT, UNITS 1 AND 2 (7 pages follow)

DC Sources-Operating 3.8.4 SURVEILLANCE REQUIREMENTS (continued)

SURVEILLANCE FREQUENCY SR 3.8.4.2 Verify no visible corrosion at battery terminals 92 days and connectors.

OR Verify battery connection resistance is within limits.

SR 3.8.4.3 Verify battery cells, cell plates, and racks show 12 months no visual indication of physical damage or abnormal deterioration that could degrade battery performance.

SR 3.8.4.4 Remove visible terminal corrosion, and verify 12 months battery cell to cell and terminal connections are coated with anti-corrosion material.

SR 3.8.4.5 Verify battery connection resistance is within 12 months limits.

SR 3.8.4.6 Verify battery chargers D-07, D-08, and D-09 each 18 months supply Ž 320 amps at greater than or equal to the minimum established float voltage for Ž 8 hours9.259259e-5 days <br />0.00222 hours <br />1.322751e-5 weeks <br />3.044e-6 months <br />, and battery chargers D-107, D-108, and D-109 each supply 2 420 amps at greater than or equal to the minimum established float voltage for 2 8 hours9.259259e-5 days <br />0.00222 hours <br />1.322751e-5 weeks <br />3.044e-6 months <br />.

OR Verify each battery charger can recharge the battery to the fully charged state within 24 hours2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br /> while carrying normal loads, after a battery discharge to the bounding design basis event discharge state.

(continued)

Point Beach 3.8.4-2 Unit 1 - Amendment No.

Unit 2 - Amendment No.

DC Sources-Operating 3.8.4 SURVEILLANCE REQUIREMENTS (continued)

SURVEILLANCE FREQUENCY

+

SR 3.8.4.7 ------------------------- NOTES-------------------------

The modified performance discharge test in SR 3.8.4.8 may be performed in lieu of SR 3.8.4.7.

Verify battery capacity is adequate to supply, 18 months and maintain in OPERABLE status, the required emergency loads for the design duty cycle when subjected to a battery service test.

SR 3.8.4.8 Verify battery capacity is 2 80% of the 60 months manufacturer's rating when subjected to a performance discharge test or a modified AND performance discharge test.

12 months when battery shows degradation or has reached 85% of expected life with capacity

< 100% of manufacturer's rating AND 24 months when battery has reached 85% of the expected life with capacity 2Ž100% of manufacturer's rating Point Beach 3.8.4-3 Unit 1 - Amendment No.

Unit 2 - Amendment No.

DC Sources-Operating B 3.8.4 B 3.8 ELECTRICAL POWER SYSTEMS B 3.8.4 DC Sources-Operating BASES BACKGROUND The station DC electrical power system provides the AC emergency power system with control power. It also provides both motive and control power to selected safety related equipment and preferred AC vital instrument bus power (via inverters). As required by the Point Beach Design Criteria (Ref. 1), the DC electrical power system is designed to have sufficient independence, redundancy, and testability to perform its safety functions, assuming a single failure.

The safety-related 125 VDC system consists of four main distribution buses: D01, D02, D03, and D04, in addition to two swing buses (D301 and D302) each capable of supplying one of the four 125 VDC buses.

Each of the four main distribution buses is powered by a battery charger (D07, D08, D107 and D108) and a station battery (DO5, D06, D105, and D106). The function of the battery chargers is to supply their respective DC loads, while maintaining the batteries at full charge. All of the battery chargers are powered from the 480 VAC Engineered Safety Feature (ESF) system.

The battery chargers are interlocked such that a loss of offsite power will disconnect the battery chargers from their 480 VAC source. A coincident safety injection signal would prevent restoration of the battery chargers unless offsite power is restored to the safeguards buses. This limits the loading on the standby emergency power supply during the period immediately following a safety injection signal. During this period, the 125 VDC loads are supplied by their associated station battery until such time as power to the chargers is restored.

Two swing battery chargers are available through one of the swing DC distribution buses. Swing charger D09 is connected to swing DC distribution bus D301 and can provide a source of DC power to distribution buses D01 or D02. Likewise, swing charger D109 is connected to swing DC distribution bus D302 and can provide a source of DC power to distribution buses D03 or D04. In addition, there exists a swing safety-related battery D305 which is connected to swing DC distribution bus D301. This swing battery is capable of being aligned to any one of the four main distribution buses to take the place of the normal battery. Interlocks exist on swing DC distribution buses D301 and D302 which prevent the paralleling of redundant DC buses.

The station batteries have been sized to carry their expected shutdown loads following a plant trip/LOCA and loss of offsite power, or following Point Beach B 3.8.4-1 Unit 1 - Amendment No.

Unit 2 - Amendment No.

DC Sources-Operating B 3.8.4 BASES BACKGROUND a station blackout for a period of one hour, without battery terminal (continued) voltage falling below 105 volts (for battery considerations) and while maintaining voltage at the fed components sufficient for them to operate. Load profiles for batteries D05, D06 and D305 are shown in FSAR Figure 8.7-2 and for batteries D105 and D106 in FSAR Figure 8.7-3 (Ref. 2). The swing station battery, D305, has been sized to provide an equivalent voltage at each of the four main DC buses. The swing battery chargers and the swing battery allow the normally on-line battery chargers and batteries to be removed from service for maintenance or testing that can not be performed with the equipment on-line.

Each 125 VDC battery is separately housed in a ventilated room apart from its charger and distribution centers. Each subsystem is located in an area separated physically and electrically from the other subsystem to ensure that a single failure in one subsystem does not cause a failure in a redundant subsystem. There is no sharing between redundant Class 1E distribution subsystems.

The batteries are sized to produce required capacity at 80% of nameplate rating, corresponding to warranted capacity at end of life cycles and the 100% design demand. Battery size is based on 125% of required capacity. The voltage limit is 2.13 V per cell; however, to ensure that the battery is maintained in a charged state, the charger voltage is maintained greater than 129.8 V for batteries D05 and D06 (59 cell batteries), and 132.0 V for batteries D105 and D106 (60 cell batteries). This corresponds to a minimum nominal cell voltage of 2.20 V per cell. The criteria for sizing large lead storage batteries are defined in IEEE-485 (Ref. 3).

Each DC electrical power subsystem has ample power output capacity for the steady state operation of connected loads required during normal operation, while at the same time maintaining its battery bank fully charged. Each battery charger also has sufficient capacity to restore the battery from the design minimum charge to its fully charged state within 24 hours2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br /> while supplying normal steady state loads discussed in the FSAR, Chapter 8.7 (Ref. 2).

APPLICABLE The initial conditions of Design Basis Accident (DBA) and transient SAFETY ANALYSES analyses in the FSAR, Chapter 14 (Ref. 4), assume that Engineered Safety Feature (ESF) systems are OPERABLE. The DC electrical power system provides normal and emergency DC electrical power for the standby emergency power sources, emergency auxiliaries, and control and switching during all MODES of operation.

Point Beach B 3.8.4-2 Unit 1 - Amendment No.

Unit 2 - Amendment No.

DC Sources-Operating B 3.8.4 BASES SURVEILLANCE SR 3.8.4.4 and SR 3.8.4.5 REQUIREMENTS (continued) Visual inspection and resistance measurements of inter-cell, inter-rack, inter-tier, and terminal connections provide an indication of physical damage or abnormal deterioration that could indicate degraded battery condition. The anticorrosion material is used to help ensure good electrical connections and to reduce terminal deterioration. The visual inspection 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 3.8.4.4.

The connection resistance limits for SR 3.8.4.5 shall be no more than 20% above the resistance as measured during installation, or not above the ceiling value established by the manufacturer.

The Surveillance Frequencies of 12 months is consistent with IEEE-450 (Ref. 6), which recommends cell to cell and terminal connection resistance measurement on a yearly basis.

SR 3.8.4.6 This SR verifies the design capacity of the battery chargers. According to FSAR 8.7 (Ref. 2), the battery charger supply is sized to recharge its respective partially discharged battery within 24 hours2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br /> while carrying normal loads. The minimum required amperes and duration ensures that these requirements can be satisfied.

This SR provides two options. One option requires that battery chargers D-07, D-08, and D-09 be capable of supplying 203 320 amps at the minimum established float voltage for 8 hours9.259259e-5 days <br />0.00222 hours <br />1.322751e-5 weeks <br />3.044e-6 months <br />, and battery chargers D-107, D-108, and D-109 be capable of supplying 420 amps at the minimum established float voltage for 8 hours9.259259e-5 days <br />0.00222 hours <br />1.322751e-5 weeks <br />3.044e-6 months <br />. The ampere and voltage requirements are based on the design capacity of the chargers (Ref. 2). The amperage requirements are based on the chargers' maximum current limit with a 30 amp margin to the respective chargers' current limit setpoint. The time period is sufficient for the charger temperature to have stabilized and to have been maintained for at least 2 hours2.314815e-5 days <br />5.555556e-4 hours <br />3.306878e-6 weeks <br />7.61e-7 months <br />.

The other option requires that each battery charger be capable of recharging the battery after a service test, coincident with supplying normal loads. The duration for this test may be longer than the charger design capacity test discussed in the first option since the battery recharge is affected by float voltage, temperature, and the exponential Point Beach B 3.8.4-6 Unit 1 - Amendment No.

Unit 2 - Amendment No.

DC Sources-Operating B 3.8.4 BASES SURVEILLANCE decay in charging current. The battery is recharged when the REQUIREMENTS measured charging current is 2 amps.

(continued)

SR 3.8.4.7 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 discharge rate and test length should correspond to the design duty cycle requirements as specified in Reference 2.

The Surveillance Frequency of 18 months is consistent with the recommendations of Regulatory Guide 1.32 (Ref. 7) and Regulatory Guide 1.129 (Ref. 8).

This SR is modified by a Note which allows the performance of a modified performance discharge test in lieu of a service test.

SR 3.8.4.8 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 determined by the acceptance test. The test is intended to determine overall battery degradation due to age and usage.

Either the battery performance discharge test or the modified performance discharge test is acceptable for satisfying SR 3.8.4.8; however, only the modified performance discharge test may be used to satisfy SR 3.8.4.8 while satisfying the requirements of SR 3.8.4.7 at the same time.

A modified discharge test is a test of the battery capacity and its ability to provide a high rate, short duration load (usually the highest rate of the duty cycle). This will often confirm the battery's ability to meet the critical period of the load duty cycle, in addition to determining its percentage of rated capacity. Initial conditions for the modified performance discharge test should be identical to those specified for a service test.

The modified performance discharge test is a simulated duty cycle consisting of just two rates; the one minute rate published for the battery or the largest current load of the duty cycle, followed by the test rate employed for the performance test, both of which envelope the duty cycle of the service test. Since the ampere-hours removed by a rated one minute discharge represents a very small portion of the battery capacity, the test rate can be changed to that for the performance test without compromising the results of the performance Point Beach B 3.8.4-7 Unit 1 - Amendment No.

Unit 2 - Amendment No.

DC Sources-Operating 3.8.4 SURVEILLANCE discharge test. The battery terminal voltage for the modified REQUIREMENTS performance discharge test should remain above the minimum battery (continued) terminal voltage specified in the battery service test for the duration of time equal to that of the service test.

The acceptance criteria for this Surveillance are consistent with IEEE-450 (Ref. 6) and IEEE-485 (Ref. 3). These references recommend that the battery be replaced if its capacity is below 80% of the manufacturer's rating. A capacity of 80% shows that the battery rate of deterioration is increasing, even if there is ample capacity to meet the load requirements.

The Surveillance Frequency for this test is normally 60 months. If the battery shows degradation, or if the battery has reached 85% of its expected life and capacity is < 100% of the manufacturer's rating, the Surveillance Frequency is reduced to 12 months. However, if the battery shows no degradation but has reached 85% of its expected life, the Surveillance Frequency is only reduced to 24 months for batteries that retain capacity 2 100% of the manufacturer's rating. Degradation is indicated, according to IEEE-450 (Ref. 6), when the battery capacity drops by more than 10% relative to its capacity on the previous performance test or when it is 2 10% below the manufacturer's rating.

These Frequencies are consistent with the recommendations in IEEE-450 (Ref. 6).

REFERENCES 1. FSAR. Chapter 8.0.

5. FSAR. Chapter 8.7.
6. IEEE-485-1978.
7. FSAR. Chapter 14.
9. Regulatory Guide 1.93, December 1974.
10. IEEE-450-1987.
11. Regulatory Guide 1.32, February 1977.
12. Regulatory Guide 1.129, December 1974.

Point Beach B 3.8.4-8 Unit 1 - Amendment No.

Unit 2 - Amendment No.

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