ML20211J739

Rev 5 to Sp 773.4, Performance Test of Neutron Monitoring Batteries & Maint Form

ML20211J739
Person / Time
Site:	Millstone
Issue date:	09/29/1997
From:	NORTHEAST NUCLEAR ENERGY CO.
To:
References
SP-773.4, NUDOCS 9710080279
Download: ML20211J739 (19)

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• NDS Document Transmittal #095B9

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Nuclear Regulatory Commission Addressee Uniaew 140 Document Control Desk ROUTINE distributen d

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Washington, D.C. 20666 l

The following documents have been revised. You are currently on distribution for these documents. Verify that all documents are included in this distribution set.

DOCUMENT REY COPIES j

SP 773.4 5

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G MILLSTONE NUCLEAR POWER STATION SUitVEILLANCE PROCEDURE Performance Test of Neutron Monitoring Batteries SP 773.4 -

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' Suritillance Procedure Performance Test of Neutron Monitoring Batteries TABLE OF CONTENTS 1.

PURPOSE....................................................3 2.

P R E REQ U IS ITES.............................................

3 3.

P R E CAUTI O N S...............................................

5 4.

I N STR U CTI ON S..............................................

7 4.1 As - Fo u n d D a t a..........................................

7 4.2 7bst Equipment Se t up.....................................

7 4.3 Pe rforma n ce 1bst.........................................

9 4.4 7bst Equipment Removal.................................

11 4.5 Capacity Calculation.....................................

12 5.

REVIEW AND SIGN-O FF....................................

13 6.

R E FE R EN C ES...............................................

13 7.

S U M M ARY O F CH ANG ES....................................

14 AlTACHMENTS ANi> FORMS Maint. Form 773.4-1," Performance Test of Neutron Monitoring Batteries"

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1. PURPOSE 1.1 Objective This procedure tests the ability of the neutron monitoring battetics to I

meet the reqirements of Technical Specification 4.9.B.1.c. It is a single-load profile test.

1.2 - Discussion Performance of this procedure satisfies the Technical Specification requirements for performance testing of the neutron monitoring batteries.

Performance testing verifies that the capacity of the battery is adequate to i

perform its intended function.

1.3 Applicability This procedure applies to the neutron monitoring batteries 1 A,1B,2A, and 2B when the unit is in COLD SilUTDOWN.

1.4 Frequency NOTE 1.

Degradation is indicated when the battery capacity dro 3s more than or is below 90%pacity from its average on previous performance tests 10% of rated ca of the manufacturer s rating.

i 2.

The service life of the neuwon monitoring batteries is 20 years.

l At least once every 60 months or annually if the battery shows signs of l

degradation or has reached 85% of the service life expected for the l

application.

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2. PREREOUISITES 2.1 General 2.1.1 An Automated Work Order (AWO) has been prepared and approved as necessary by the Unit 1 Operations Department.

2.1.2 Battery to be tested has been on float charge for at least 72 hours8.333333e-4 days <br />0.02 hours <br />1.190476e-4 weeks <br />2.7396e-5 months <br />.

l 2.1.3 Protective tagging has been established, with blue tags on the j

applicable charger and charger ac and de breakers in "ON"

position, a

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2.1.4 All loads have been removed from sen' ice on the train being tested, or those loads have been powered from another source.

2.1.5 Unobstructed egress from the battery area has been verified.

2.2 Documents 2.2.1 SP 755.2 " Battery Quarterly Surveillance" and Maint. Form 755.2-3. " Battery Quarterly Suiveillance-Neutron Monitoring System Battery" 2.2.2 25202-30008 Sheet 1,"125VDC One Line" 2.3 Measuring and Test Equipment 2.3.1 All M&TE has been calibrated in accordance with WC 8,-

" Control and Calibration of Measuring and Test Equipment," and the calibration is current.

2.3.2 Digital multimeter with a range of 0 to 200 mVDC, O to 20 VDC, and 0 to 200 VDC, and an accuracy of 0.05% such as OA-1517 (3 required)

O 2.3.3 -

50-mV shunt with a range of 0.001 ohm and an accuracy of i0.25% iv= 0 0000025 amps such as OA-1513A 2.3.4 Stopwatch with an accuracy 0.1% ofinput such as OA-472 2.4 Tools and Consumables 2.4.1 Other Test Equipment Resistive load banks in parallel (five recommended)

1. 8 AWG, stranded-wire connecting cables and meter leads of sufficient length to prevent arcing in vacinity of battery Fuse,30-amp O

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Safety glasses Low-voltage gloves Long-sleeved shirt Electrician's standard tool kit (adequately insulated) l 2.4.3 Equipment Facilities for quick drenching of the eyes and body in case of an acid spill 2.5 Responsibilities 2.5.1 Operations Department is responsible for placing battery on equalizing charge and verifying "24V llATTERY CIIARGER TROUBLE" alarm clears on CRP 908, A-2 (8-7) following completion of performance test.

2.6 Definitions 2.6.1 8-IlOUR DISCllARGE RATE-The manufacturer's rated 8-hour discharge rate for the battery. In this case, for a 2-MCX-5,it would be 170 amp hours + 8 hours9.259259e-5 days <br />0.00222 hours <br />1.322751e-5 weeks <br />3.044e-6 months <br /> = 21.25 amps.

l 2.6.2 K-The discharge current correction factor for the initial electrolyte temperature.

2.6.3 CORRECTED DISCIIARGE RATE-The 8-hour discharge rate + K.

2.6.4 ICV-Individual cell voltage l

2.6.5 DMM-Digital multimeter

3. PRECAUTIONS 3.1 Smoking, flames, and other sources of ignition are not permitted while working in proximity to or on batteries.

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'3.2 Ensure that all consumables to be used in or on power plant components V

are controlled in accordance with CC 1," Control of Chemical Consumable Products," and that a llestricted Use Permit has been issued as necessary.

3.3 Ensure load test equipment includes short-circuit protection.

3.4 Ensure facilities for quick drenching of the eyes and body in case of an acid spill is provided within 25 feet of working area.

3.5 Do not allow any metal objects to short across the battery connections.

l Wearing metallic objects such as jewlery is prohibited.

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4. 1NSTRUCIlONS y

l-4.1 - As-Found Data 1

4.1.1 Refer 7b SP 755.2, " Battery Quarterly Surveillance," and MEASURE and RECORD the following for each cell:

Electrolyte level

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Temperature i

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Specific gravity i

InAidual cell voltage (ICV) 1 i

j 4.1.2 RECORD as-found average electrolyte temperature on Maint.

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Form 773.4-1.

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4.1.3 MEASURE battery terminal voltage and RECORD as-found

. value on Maint. Form 773.4-1.

4.2 Test Equipment Setup i

O 4.2.1 On front of all resistive load banks, SET all breakers to "OFF"

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and all individual switches to midposition ("OFF").

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4.2.2 Refer *Ib 25202-30008 sheet 1,"125VDC One Line" and Figure l

O 1, REQUEST dual verification, and PERFORhi the following:

Figure 1 - Typical Test Setup IIATfERY llATTERY 0

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0-200V l!

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(Ungivunded SilUNT I

Tr in 1) g 0-200my RESISTIVE LOAD llANKS a.

Using test lead, CONNECT the resistive load banks to the grounded battery terminal, and DOCUh1ENT connection on hiaint. Form 773.4-1.

b.

Using test lead, CONNECT fused side of 50-mV shunt to ungrounded battery terminal and DOCUh1ENT connection on hiaint. Form 773.4-1.

c.

Using a Dhiht set to the 0 - 200 VDC range, CONNECT Dhihi to battery terminals as necessary to monitor battery voltage, and DOCUhiENT connection on hiaint. Form 773.4 - 1.

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e NOTE in the following configuration,1 mV measured by the Dhiht equals 1 amp.

d.

Using a second Dhiht set to the 200 mVDC range, CONNECT second Dhihi to terminals of 50-mV shunt as necessary to monitor equivalent amps, and DOCUh1ENT l

connection on hiaint. Form 773.4-1.

l 4.3 Performance Test 4.3.1 On respective "24V DC CHARGER" panel, ROTATE " FLOAT" potentiometer fully counterclockwise and OPEN "AC INPUT" breaker.

NOTE Undervoltage alarm for the battery charger is monitoring voltage on the -

battery side of the de output breaker, not the charger side. Trouble alarm will be received when battery is discharged, not when charger is deenergized.

O 4.1.?

NOTIFY Control Room of impending "24V BATTERY CllARGER TROUBLE" alarm on CRP 908, A-2 (8-7).

4.3.3 On respective "24V DC CHARGER" panel, OPEN "DC OUTPUT" breaker.

4.3.4 RECORD overall battery voltage on hiaint. Form 773.4-1.

NOTE 1.

The 8-hour discharge rate is the manufacturer's rated 8-hour discharge rate for the battery, in this case, for a 2-htCX-5, it would be 170 amp hours + 8 hours9.259259e-5 days <br />0.00222 hours <br />1.322751e-5 weeks <br />3.044e-6 months <br /> = 21.25 amps.

2.

K is the discharge current correction factor for the initial electrolyte temperature.

4.3.5 Refer 1b Maint. Form 773.4-1 and Table 1, and CALCULATE temperature-corrected discharge rate as follows.

Corrected Discharge Rate =.8-Hour Discharge Rate + K 1

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Table 1.

Discharge Current Correction Factor K for Temperature Average Electrolyte 1bmperature

( C)

( F)

Factor K 16.7 62

-1.098 17.2

-63 1.092 17.8 64 1.086 18.3 65 1.080

-18.9 66 1.072 19.4 67 1.064 20.0 68 1.056 20.6 69 1.048

-21.1 70 1.040 21.7 71 1.034 22.2 72 1.029 22.8 73 1.023 23.4 74 1.017 O-23.9 75 1.011 24.5 76 1.006 25.0 77 1.000 25.6 78 0.994 26.1 79 0.987 26.7 80 0.980-27.2 81 0.976

- 27.8 -

82-

- 0.972 28.3 83 0.968 28.9 84 0.964 29.4 85 0.960 30.0 86 0.956 30.6 87 0.952 31.1 88 0.948 31.6 89 0.944 32.2 90 0.940 32.8 91 0.938 33.4 92 0.936 O

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' p 4.3.6 On front of all resistive load banks, SET all breakers to "ON,"

V and ADJUST resistive load banks to establish and maintain the discharge rate calculated in step 4.3.5.

4.3.7 RECORD test start time on Maint. Form 773.4-1.

I 4.3.8 At the discharge test time intervals shown on Maint. Form 773.4-1, PERFORM the following:

a I

NOTE 1.

Individual cell voltage readings should be taken between terminal posts oflike-polarity of adjacent cells, so as to include the voltage drop of the intercell connectors.

2.

Near the end of test, there may not be enough time to record a full set i

of ICVs. In this case, the ICVs which have been trending as the lowest values should be measured and recorded.

4 j

a.

Using a third DMM, MEASURE each ICV, and RECORD measured values on Maint. Form 773.4-1.

4 i

b.

MEASURE overall battery voltage, and RECORD measured l

values on Maint. Form 773.4-1.

c.

MAINTAIN and RECORD discharge rate.

l 4.3.9 WIIEN m y of the following occurs, SET all resistive load bank breakers to "OFF," and RECORD test termination time on Maint. Form 773.4-1:

Overall battery voltage reaches 21 volts.

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Any cell ICV indicates it is reaching reversal of its polarity (plus IV or less).

The 8-hour test period has elapsed.

4.4 Test Equipment Removal 4.4.1 On front of all resistive load banks, SET all breakers to "OFF" and all individual switches to midposition ("OFF").

4.4.2 Refer Tb 25202-30008 sheet 1,"125VDC One Line" and Figure 1, REQUEST dual verification and PERFORM the following:

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a.

DISCONNECT fused side of 50-mV shunt from

. O ungrounded battery terminal and DOCUMENT disconnection on Maint. Form 773.4-1.

b.

DISCONNECT the resistive load banks from the grounded battery terminal, and DOCUMENT disconnection on Maint. Form 773.4-1.-

c.

DISCONNECT DMM from battery terminals, and l

l DOCUMENT disconnection on Maint. Form 773.4-1.

d. DISCONNECT second DMM from terminals of 50-mV l

shunt, and DOCUMENT disconnection on Maint. Form 773.4 - 1.

4.5 Capacity Calculation 4.5.1 CALCULATE and dual VERIFY battery capacity as shown on Maint. Form 773.4-1.

4.5.2 RECORD calculated battery capacity on Maint. Form 773.4-1.

4.5.3 REQUEST SM/US place battery on equalizing charge in O

accordance with OP 344B,"24 Volt DC Electrical System" and verify "24V BATTERY CHARGER TROUBLE" alarm clears on CRP 908, A-2 (8-7).

4.5.4 COMPLETE Maint. Form 773.4-1.

4.5.5 PROVIDE copy of completed Maint. Form 773.4-1 to System Manager.

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5. ' REVIEW AND SIGN-OfE l

5.1 The review and sign-off for this procedure is satisfied by the review and sign-off of the AWO and Maint. Form 773.4-1.

6. REFEi1ENCES l

6.1 NUSCo Accident Prevention Manual 6.2 lbchnical Specifications 6.2.1 Technical Specifications, Sections 3.9 & 4.9, " Auxiliary Electrical System" 6.3 Drawings 6.3.1 NUSCo drawing 25202-30008, sheet 1,"125VDC One Line" 6.4 Vendor Manuals 6.4.1 25202-299-012A, Gould, Inc. "MCX-170 Neutron Monitoring Batteries" 6.5 Procedures 6.5.1 SP 755.2 " Battery Quarterly Surveillance" l

6.5.2 OP 344B,"24 Volt DC Electrical System" 6.5.3 CC 1," Control of Chemical Consumable Products" 6.5.4 WC 8," Control and Calibration of Measuring and Test Equipment" 6.6 Other Documents 6.6.1 IEEE 450-1975 6.6.2 EPRI Power Plant Electrical Reference Series, Volume 9,"DC Distribution System" 6.6.3 Memo from B. M. Radimer of IEEE Power Engineering Society to K. Johnson of San Onofre Nuclear Generating Station te Interpretation Request of ANSI /IEEE 450-1987 4

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7. 'SUhih1ARY OF CllANGES y

7.1 Various editorial and reference changes were made as a result of the Biennial Review.

7.2 Incorporated interim change I which made minor editorial corrections.

7.3 Incorporated interim change 2 which redefined the battery manufacturer's code for stating 8-hour discharge rate and corrected stated range of the digital multimeters.

7.4 Added reference to SP 755.2, " Battery Quarterly Surveillance" for collecting electrolyte level, temperature, specific gravity, and ICV data.

7.5 Change procedure from a maintenance procedue to a surveillance j

procedure in keeping with PORC's philosophy regarding the applicability of Technical Specifications to neutron monitoring batteries.

7.6 Deleted information regarding combined discharge rate calculations.

l 7.7 Added step to measure battery terminal voltage at beginning of test.

7.8 Eliminated requirement to use a clamp-on ammeter, n

V 7.9 Added prerequisite that allloads have been remeved from service on the train being tested, or those loads have been powered from another source.

r8U SP 773.4 Level of Use STOP

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Form Approvalj O

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(.qq gq9 ws EF Perfortnatice Test of Neutron Monitoring Batteries Generic Information l Reference Procedure Applicable Tech, Spec.

Frequency At least onco every 60 months. Or, annually SP 773.4 4.9.B.1.c f battery shows signs of degradation or has reached 85% of service life.

This form is being used for the following:

@ Tech Spec Surveillance O system ^'i9 ament O Other:

Q Maintenance Restoration Q Non-Tech Spec (Retest)

Surveillance (PM)

Specific Information Scheduled Date Applicable Mode AWO Test Authorted By (SM/US)

Date Prerequisites Completed By (initials /Date)

Precautions Noted By (Instials/nate)

Surveillance Completed By Date Acceptance Criteria Met?

O vES O No Accepted By (Department FLS)

Date Approved By (Department Head / Designee)

Date

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Shift Manager Notified of Failed Survedlance Date Acceptance Criteria Battery is capable of delivering at least 80 percent of rated capacity.

Test Equipment Equioment Tvoe identification /OA Number Calibration Due Date Dicital Multimeters 50-mV Shunt Stopwatch Maint. Form 773.4-1 Rev.5 Page 1 of 4

Performance Test of Neutron Monitoring llatteries O

y ACCEL'fANCE INSPECTION PERFORMED VERIFIED STEP NO*

ATTRillUTE CRITERIA RESULTS IlY / DATE IlY / DATE Completion of Maint.

Form completed and CSAT 4'1'1 Form 755.2-3 attached QUNSAT As-found average 4.1.2 electrolyte Information Only F

N/A temperature

^5 ttery 26.4 to 27 VDC VDC N/A 4.1.3 rn 1 ot e Resistive load banks Resistive load banks connected to OSAT 4*9 9 "'

connections grounded battery OUNSAT terminal Fused side of 50-mV shunt connected to SM 4.2.2h.

Shunt connections ungrounded battery OUNSAT terminal DMM connected to DMM #1 battery terminals as OSAT 4.2.2.c.

connections necessary to monitor CUNSAT battery voltage DMM connected to terminals of 50-mV DMM #2 OSAT 4.2.2.d.

shunt as necessary to connections monitor equivalent UNSAT amps Os all battery Information Only VDC N/A 4.3.4 s

4.3.5 Inf rm tion Only amps N/A re ted dis lia ge te Corrected Discharge Rate (amps)= 8-Hour Discharge Rate + K amps +

=

4.3.7 Test start time Information Only

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Maint. Form 773.4-1 Rev. 5 Page 2 of 4

j Perforniance Test of Neutron Monitoring flatteries j

O.

icvs (veits oc) sien 4.3.8 Test Tinte (IIrs: Min.)

Cell 0:00 1:00 2:00 3:00 4:00 5:09 6:00 7:00 7:10 7:20 7:30 7:40 7:50 8:00 1

2 3

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4 5

6 7

8 9

10 11 12

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Overall llattery Voltage and Discharge Rate (Step 4.3.8)

TEST TIME

' LIME OVERALL llATI ERY DISCilARGE RNI E (IIR: MIN.)

(IIR: MIN.)

VOLTAGE (VDC)

(AMI'S) 0:00 1:00 2:00 3:00 4:00 5:00 6:00 7:00 7:10 7:20 4

7:30 7:40 7:50 8:00 Ma:at. Form 773.4-1 Rev. 5 Page 3 of 4

Perforinance Test of Neutron Monitoring Batteries I

ACCEL'rANCE INal'ECrl0N l'ERFORMEli VERIFIED S'IEI' NO.

ATTRIHUTE CRITERIA RESULTS IlY / DATE BY / DATE Overall battery voltage reaches 21 volts.

l Or, any cell ICV indi-C' t l-4.3.9 Test termination time

]r d ofi polft N/A (plus 1V or less).

Or, the 8-hour test period has elapsed.

1 Fused side of 50-mV shunt disconnected SAT 4.4.2.a.

Shunt disconnections from ungrounded CUNSAT j

batten termmal i

Resistive load banks Resistive load banks disconnected from USAT 4.4.2.b.

l disconnections grounded battery OUNSAT termmal O

DMM disconnected DMM #1 OSAT-4.4.2.c.

from battery disconnection terminals UNSAT Second DMM DMM #2 disconnected from USAT 4A.2.d*

discontiection terminals of 50-mV CUNSAT I

shunt 4.5.1 B uenpap chy At least 80% of rated calculation capacity

% Capacity at 25 C (77"F) = (Ta+Ts).100 i

Where:

Ta = time of test termination per step 4.3.9.

Ts = rated time to specified terminal voltage = 8 Hours

+

.100 =

Ta Ts I

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V Maint. Form 773.4-1 Rev.5 Page 4 of 4

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