ML20080E105

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Rev 6 to Procedure 08-S-04-104, Chemistry Instruction: Operation of Conductivity Bridge,Safety Related
ML20080E105
Person / Time
Site: Grand Gulf  Entergy icon.png
Issue date: 04/21/1983
From: Holbrook A
MISSISSIPPI POWER & LIGHT CO.
To:
Shared Package
ML20080E069 List:
References
08-S-04-104, 8-S-4-104, NUDOCS 8308300724
Download: ML20080E105 (12)
v • d • e


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, PLANT OPERATIONS MANUAL )

N Volume 8 '

08-S-04-104 9 Section 04 Revision 6 Date: 4-21-83 CFEMISTRY INSTRUCTION OPERATION OF CONDUCTIVITY BRIDGE SAFETY RELATED l

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4

GRAND GULF NUCLEAR STATION CHEMISTRY INSTRUCTION

Title:

Operation of Conductivity No.:08-S-04-104 Revision: 6- Page: 1 Bridge fg 1.0 INSTRUMENT DESCRIPTION Leede & Northrup Conductivity Bridge Model No. 4959

2.0 REFERENCES

2.1 Leeds and Northrup Instroccion Manual - Model 4959 (177335) 2.2 Chemistry Procedure No. 08-S-03-01, Qualification of Chemistry Program 2.3 Chemistry Procedure No. 08-S-03-7, Control of Chemistry Support Equip-ment 1

3.0 DEFINITIONS I None

  • 4.0 ~ PREREOUISITES 4.1 Apparatus Required 4.1.1 Unknown cell (Dip or flow) 4.2 Reagents Required 4.2.1 Potassium Chloride Standard (0.001, 0.01 or 0.1N) 4.3 Resistors of ' certified values 4.4 Attachments 4.4.1 Attachment I - Temperature Ratio vs Temperature 4.4.2 Attachment II - Conductivity Correction 4.4.3 Attachment III - Cell Constant Log 5.0 PRECAUTIONS 5.1 Avoid sudden introduction of very hot or very cold water to avoid possible cracking of glass parts.

5.2 When used in battery mode, ensure case of instrument is grounded.

5.3 Replace battery every 8 to 10 months regardless of usage to minimize the possibility of instrument damage from leakage.

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GRAND GULF NUCLEAR STATION CHEMISTRY INSTRUCTION ,

Title:

Operation of Conductivity No.:08-S-04-104 Revision: 6 lPage: 2

  • Bridge l .

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5.4 Allow the conductivity cell to remain in the electrolyte under test for one minute to reach electrolyte temperature.

6.0 INSTRUCTIONS 6.1 Instrument Startup -

NOTE The following procedure applies to a conductivity bridge utilizing a dip cell, except where indicated.

6.1.1 Select power source to be used. For line voltage operation, plug line cord into a nominal 120-volt 50/60 hertz power supply having a grounded third wire. For portable operation, power is provided by the internal battery source.

6.1.2 Adjust the mechanical zero of the galvanometer by setting the-BRIDGE SUPPLY switch to the OFF position and unclamping the galvanometer. Turn the galvanometer zero adjuster until the pointer comes to rest at zero.

6.1.3 Adjust the electrical sero of the instrument by placing the BRIDGE SUPPLY switch at the frequency to be used for measuring; normally 50-60 Hz. }

6.1.4 Set the MULTIPLIER to the CK position.

6.1.5 Set the ohns scale at 2.000.

6.1.6 Adjust the ZERO knob until the galvanometer needle indicates zero.

6.1. 7 Set the compensator by locking down the detector key and adjusting the compensator knob until the galvanometer pointer comes to rest at the zero position.

6.1.8 Restore the instrument to a standby condition by placing the BRIDGE SUPPLY switch to OFF.

6.2 Functional Check 6.2.1 Conductivity Bridge

a. Functional check frequency specified in the Calibration / Functional Check Log Book.

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GRAND GULF NUCLEAR STATION CHEMISTRY INSTRUCTION

Title:

Operation of Conductivity No.:08-S-04-104 l Revision: 6 lPage: 3 Bridge l l

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b. Ensure instrument start-up in accordance with 6.1.
c. Verify instrument is within prescribed calibration due-dates.

l l d. Connect the leads from the certified resistor panel to the L instrument CELL BINDING posts.

e. Place the Bridge Supply switch to the 50/60 Hz position.
f. Select any resistor value on the certified resistor panel.
g. Depress the DETECTOR KEY, and select the multiplier range that most closely corresponds to the resistor selected in 6.2.1. f.

(i.e. , a 500 ohm resistor would correspond to the multiplier range marked 10 2),

h. Rotate the SCALE SETTER until the galvanometer needle rests at zero. This value should correspond to the certified resistor value, within a tolerance of < 2%. Note the reading.
i. Repeat steps 6.2.lg. and 6.2.lh. with resistors covering the expected range of analyses. Note the results.
j. After the necessary resistor ranges have been checked, place

( the BRIDGE SUPPLY switch to 0FF, release the DETECTOR knob to the up position, return the MULTIPLIER to the CK position, and disconnect the leads from the CELL BINDING posts.

k. If any reading does not fall within the acceptable limits, contact the CHEMISTRY Supervisor 6.2.2 constant Determinations
a. Cell constants will be determined upon initial use, then semi-annually. Results are recorded on Attachment III and inserted in the proper section of the Functional Check Log Book re-quired by Reference 2.3. All laboratory conductivity cells will have cell constant checks run prior to placing in service. Also, any new cells that may be used for demin quality water (<10 umho's) will be checked against a reference cell in accordance with Step 6.2.3 of this instruction.

All conductivity cells will have a form (similar to Attachment III) filled out on each cell (including reference cells) in the Functional Check Log. Conductivity cells will also have a permanent tag attached stating the following:

L i

i 1

GRAND GULF NUCLEAR STATION CHEMISTRY INSTRUCTION ,

Title:

Operation of Conductivity No.:08-S-04-104 Revision: 6 Page: 4

  • Bridge 3

'i (1) MP&L number assigned secuentially to which that cell may be cross-referenced with Attachment III in the Functional Check Log.

(2) Date/ time of last cell constant and reference cell check if applicable.

(3) Date the next cell constant. check is due.

(4) The actual cell constant calculated for the cell.

All cells will be numbered sequentially and when the cell is broken or defective, it will be retired / removed from use and a statement stating why written on bottom of Attachment III.

b. Ensure instrument start-up in accordance with 6.1.
c. Verify instrument is within prescribed calibration due dates,
d. Connect the Cell to the conductivity bridge,
e. Rinse the cell in the Potassium Chloride solution to be used for cell constant determination.
f. Immerse the dip cell, or if using a flow cell, provide a flowing stream of the proper Potassium Chloride solution (0.001N for 0.01 cell constant 0.01N for 0.1 cell constant or 0.1N for 1.0 cell constant) .
g. Measure the temperature of the Potassium Chloride solution and determine the specific conductance from the respective graph similar to Attachment IV. The graphs were plotted from the following information: .

Normality (KCI) Temp. C Specific Conductance (Micromho/cm) 0.1N O 7,138 18 11,167 25 12,856 0.0lN O 774 18 1,220 25 1,409 0.001N O 80 18 128 25 147

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GRAND GULF NUCLEAR STATION CHE14ISTRY INSTRUCTION l

Title:

Operation of Conductivity l No.:08-S-04-104 l Revision: 6 lPage: 5 l Bridge l l l l I -l

h. Adjust the SCALE SETTER until a null condition is obtained on the galvanometer.

i i. Calculate the cell constant using one of the following l equations, depending upon whether the reading observed is in resistance or conductance values, respectively.

K = RmGs or K=Gs iss .

Where K = Value of cell constant (CM-1)

Rm = Measured resistance of electrolyte (ohn)

Gm = Measured conductance of electrolyte (sho) l Gs = Specific conductance of electrolyte aho/cm at I solution temp.

NOTE 3 There are 106 micromhos in a mho. )

I.

j. When the constant of a particular cell has been determined by the above instruction and falls within + 10% of the -

i manufactured value, it may then be used in normal evolutions. f If not, it must be removed from service and destroyed.

k. Place the BRIDGE SUPPLY switch to 0FF, release the DETECTOR knob to the up position and return the MULTIPLIER to the check position.
1. For COND cells that may be used for low conductivity samples, perform a Reference Cell check as per Step 6.2.3.

6.2.3 Reference Cell Check

a. Perform this check af ter cell constant check in 6.2.2 has been performed. These will be performed using a Reference Cell I with the same cell constant as the one being checked (i.e. , if l going to check a 0.1 constant flow cell, use an identical l reference cell).
b. Ensure the reference cell has had a cell constant check within the last six months,
c. Verify instrument is within the prescribed calibration due dates.

CRAND GULF NUCLEAR STATION CHEMISTRY INSTRUCTION ,

Title:

Operation of Conductivity No.:08-S-04-104 l Revision: 6 Page: 6

  • Bridge l 3

s .

d. Verify instrument has been functionally checked within the prescribed time period.
e. Using the same instrument (Bridge) and pure demin water sample, read the sample with each cell (Reference and the cell being checked); in accordance with Section 6.3 of this instruction.
f. Calculate the % deviation as follows:

Rf -

C

%R= Rf x 100 Where % R - % deviation between Reference Cell and cell being checked Rf - conductivity on demin sample for Reference cell C - conductivity on same demin sample for cell being checked

g. Log the % R value on Attachmont III (located in the Functional Check Log) in the % of Reference Cell slot. This value should be + 10%; if not, take the cell out of service and retire it from the system.

\

h. Reference Cell checks need only be doce for cells that may be '

used in systems where the water quality is 10 unho/cm or less.

i. All Reference Cells will have a permanent tag attached with the following info:

(1) Reference Cell and MPL #

(2) Statement as follows: "Not for Plant .Use" (3) Date/ time of last cell constant check (4) Actual cell constant of the cell (5) Date next constant due 6.3 Analysis 6.3.1 Verify instrument start-up in accordance with 6.1.

,G1tAND GULF NUCLEAR STATION CHEMISTRY INSTRUCTION

Title:

Operation of Conductivity No.:08-S-04-104 Revision: 6 I Page: 7 Bridge O,

i 6.3.2 Verify instrument is within prescribed calibration due-dates.

6.3.3 Verify functional check performed within proper time frame as stated in the Calibration / Functional Check Book.

6.3.4 If necessary, connect the leads from the conductivity cell to the instrument CELL BINDING posts.

6.3.5 Dip Cell

a. Rinse the cell in demineralized water, gently shake off the excess. Do not attempt to blot or blow dry.
b. Immerse the cell in the solution to be measured ensuring any entrapped air is removed.

6.3.6 Flow Cell

a. Connect the cell to the sample stream to be measured.

, b. Start the sample flow and adjust the flow rates to approxi-

! mately 100 ml/ min. NOTE: High flow rates may damage flow cell.

6.3.7 Place the BRIDGE SUPPLY switch to the 50/60 Hz position. Depress the DETECTOR KEY. Note the position of the galvanometer needle as you rotate the HULTIPLIER switch from the CK position. (For conductance measurements, the rotation is toward decreasing values until the needle deflects to the left). Adjust the MULTIPLIER I switch and rotate the SCALE SETTER until the galvanometer needle I rests on zero. Note this reading and the multiplier setting.

NOTE A sustained null (zero) reading may not be possible when using a dip cell on demineralized water samples due to carbon dioxide absorption.

6.3.8 Measure the temperature of the solution; note this reading.

6.3.9 Release the DETECTOR knob, restore the MULTIPLIER to the CK position, and place the BRIDGE SUPPLY switch to the OFF position.

6.3.10 Calculate the measured specific conductance by using the following formula:

4

GRAND GULF NUCLEAR STATION CHEMISTRY INSTRUCTION -

l

Title:

Operation of Conductivity l No.:08-S-04-104 l Revision: 6 lPage: 8 -

l l Bridge l l l l

'T ,

'i Gs (T) = M x S x C x 106 umho/mho Where Gs (T) = Specific conductance at temperature T (umho/cm)

M = The multiplier setting (For conductance)

S = The scale setting (mho)

C = The cell constant (em-1)

a. If the measured specific conductance is greater than 1 unho/ca, the specific conductance may be calculated by using the following formula.

Gs (25"C) = Gs(T)

TCF Where Gs (25"C) = Specific conductance at 25"C (umho/cm)

Gs (T) = Specific conductance at temperature T (umho/ca) TCF =

Temperature compensation factor obtained by taking the temperature reading of step 6.3.8 and finding factor from the table' in Attachment I. )

b. If the measured specific conductance is less than 1 unho/cm, the specific conductance at 25'C may be read from the graph in Attachment II.
c. The specific conductance also may be found using the CHCOND computer program and entering the temperature and measured conductivity when requested.

7.0 DOCUMENTATION / CORRECTIVE ACTION 7.1 Documentation of functional check data shall be in accordance with Chemistry Procedure 08-S-03-7. Results shall be documented for the respective samples per Chemistry Procedure 08-S-03-10, 7.2 A label must be affixed to the respective cells used, to identify a serial number, the cell constant, and the date next due, i

GRAND, GULF NUCLEAR STATION CHEMISTRY INSTRUCTION 08-8-04-104 Rtv. 6 Attachment I Page 1 of 1 l

p TEMPERATURE RATIO vs TEMPERATURE (for water ranging from 1 to 10 umhos/cm at 25 C (77F) g l l Temperature Temperature Temperature Temperature l C Ratio C Ratio 0 0.523 51 1.619 1 0.539 52 1.644 2 0.555 53 1.671 3 0.572 54 1.698 ,

4 0.589 55 1.723 5 0.607 56 1.749 6 0.625 57 1.775 7 0.643 58 1.802 8 0.661 59 1.827 9 0.679 60 1.852 10 0.698 61 e 1.877 11 0.718 62 1.903 12 0.737 63 1.930 13 0.756 64 1.956 14 0.776 65 1.982 15 0.796 66 1.009 16 0.816 67 1.035 17 0.836 68 1.063 18 0.855 69 2.090 19 0.875 70 2.117 20 0.897 71 2.144

( 21 0.918 72 2.170 22 0.938 73 2.198 23 0.959 74 2.226 24 0.980 75 2.255 25 1.000 76 2.284 26 1.022 77 2.312 27 1.046 78 2.340 28 1.069 79 2.369 29 1.092 80 2.398 30 1.114 81 1 2.427 31 1.137 82 2.456 32 1.161 83 2.484 33 1.184 84 2.513 34 1.208 85 2.544 35 1.231 86 2.573 36 1.254 87 2.603 37 1.278 88 2.633 38 1.302 89 2.663 39 1.325 90 2.693 40 1.349 91 2.724 41 1.373 92 2.754 42 1.398 93 2.785 43 1.422 94 2.815 44 1.446 95 2.846 45 1.470 96 2.878 46 1.494 l 97 2.910 C 47 1.519 98 2.940 48 1.545 99 2.970 49 1.570 100 3.000 50- 1.595 l

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. *,,- 6 ELL CONSTANT AND REFERENCE CHECK LOG

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