ML17341A686

Nuclear Chemistry Procedure NC-81, Determination of Conductivity.

ML17341A686
Person / Time
Site:	Turkey Point
Issue date:	11/21/1979
From:	FLORIDA POWER & LIGHT CO.
To:
Shared Package
ML17341A684	List: ML17341A683 ML17341A685 ML17341A686 ML17341A687 ML17341A688 ML17341A689 ML17341A690 ML17341A692 ML17341A693 ML17341A694 ML17341A695 ML17354A214 ML20038B413
References
NC-81, NUDOCS 8112080205
Download: ML17341A686 (6)

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I IP FLORIDA POtiER & LIGHT COMPANY TURKEY POINT UNITS 3 AND 4 NUCLEAR CHEMISTRY PROCEDURE NC-81 NOVEMBER 23, 1979

2.0 22e2e

DETERMINATION OP CONDUCTIUITY 2.0 A royal and List of Effective Pa es:

2.1 Review and A oval:

Consultant Date Consultant Date KO $ l-QQ Radiochemist Date /Q ~Q/~

Tech Supv Date >o 7 Plant Supt-Nuc Date Approved by =Plant Nucle Safety Committee- Date 2.2 List of Effective Pa es:

~Pa e Date . ~Pa e Date ~Pa e Date 1 11/21/79 2 11/21/79 u./21/79 4 ll/21/79 3.0 ~3oo e:

The conductivity of water samples represents the purity of the water.

Often the conductivity of water becomes a limiting specification. For this reason, conductivity is routinely monitored in both primary and secondary chemistry.

3.2 ~Por oee:

The purpose of this procedure is to provide laboratory personnel with an approved procedure for determining the conductivity of water samples.

4.0 Instructions

4.1 Conductivity (Lab Determination Using the L & N Model 4866 Conductivit Brid e):

4.1.1 Rinse the conductivity cell thoroughly in demirieralized water then shake off any water clinging to the electrodes.

U 4.1.2 Immerse the cell in the sample to be tested so the electrodes are fully covered, and all air is expelled from the vent-holes.

.4.1.3 Measure the temperature of the sample and set the temperature on the temperature compensation dial.

8112080205 811202 PDR ADOCK 05000250 PD

ll/21/79 J

l NUCLEAR CHEMISTRY PROCEDURE NC-81, PAGE 2 J

DETERMINATION OF CONDUCTIVITY e I

+3 4.1.4 Place the plug of the selector block in the 10 position. Turn scale knob until 12 on the mhos scale is under the index on the window NOTE: When the approximate conductivity of the sample is known, place the plug in the position for the conductivity range which includes the expected sample conductivity.

4.1.5 Snap the A.C. switch to the ON position and note the direction of the galvanometer deflection.

4.1.5.1 'f a plus (+) deflection results, the specific conductance is greater than 12,000 pmhos and cannot be measured with this bridge. See method in part 4.2.

4.1.5.2 If a minus (-) deflection results, leave the switch in the ON position and turn the scale knob toward 1 on the mhos scale until the galvanometer pointer does not deflect when the A.C. switch is closed or opened. Then take a reading on the index on the mhos scale.

If, with the scale knob set at 1, a minus deflection of the galvanometer persists, leave scale knob set at one on mhos scale. Leave switch ON and shift the plug of the selec-tor block to successively lower positions until a plus .

galvanometer deflection is obtained. When a plus deflection is obtained, turn scale knob toward 12 on the mhos scale until the galvanometer pointer does not deflect when the A.C. switch is closed or opened. Then take a reading on the index on the mhos scale.

If with the scale adjust knob on 1 on the mhos scale and with the plug in the 10+- position a minus deflection persists, the specific conductance is less than .01 pmhos and cannot be measured with this bridge. See: method in part 4.2.

4.1.6 Determine the conductivity as follows:

Conductivity (pmhos) = Scale readin (from 4.1.5 x 10 x 10 N where: N Negative value of plug position 4.1.7 Record Conductivity.

4.2 Conductivit (Portable Hethod Usin the L 6 N Hodel 4959 Conductivit

~Brid e):

4.2.1 Connect conductivity cell (.01, .1, 1.0, 10, 25, or 50 cell constant)

,to the cell binding post.

4.2.2 With switch OFF and detector key down, adjust galvanometer pointer to read zero.

I I

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I NUCLEAR CHEHISTRY PROCEDURE NC-81, PAGE 3 1 DETERMINATION OF CONDUCTIVITY 4.2.3 With switch on BATTERY or "50-60" cycles', key up and multiplier switch to CK, set ohms scale at 2.0 and adjust zero knob until galvanometer pointer reads zero.

4.2,;"4 Lock detector key down, and null galvanometer by adjusting the compensator knob until pointer reads zero.

4.2.5 Read temperature ratio from chart and determine compensation factor from calculator wheel'.>

4.2.6 Set compensation'factor on the ohms scale. Key down and null galvanometer with compensator knob.

I / 4 4.2.7 With the detector key down, turn multiplier switch to correct range (needle deflects). Dial in conductivity on mhos scale and apply the cell factor for the type cell (constant) used.

Cell Constant .01 Cell .1 Cell 1.0 Cell 10 Cell 10 50-1,050 pmhos 500-10,500 pmhos 5,000-105,000 'pmhos 50,000-1,050,000 jmhos 10 5-105 'mhos 50-1,050 pmhos 500-10,500 pmhos 5,000-105,000 pmhos 10 .5-10.5 pmhos 5-105 pllglos 50-1,050 pmhos 500-10,500 'plllhos 10 .05-1.05 pmhos .5-10.5 pmhos 5-105 . pmhos 50-1>050 pmhos 10 .005-.105 pmhos .05-1.05 pmhos '.5-10.5 pmhos 5-105 pmhos 4.3 Conductivit Usin the H ron Hodel EP 4.3.lr Prior to using"the Nyron Model EP conductivity meter, perform the following battery check.

4.3.1.1 Depress the butt'on on the front of the meter.

4.3.1.2 If the glow light, located on the lower right corner of the meter face plate, glows,. continue with step 4.3.2.

If the glow light fails to glow, replace both batteries.

and check the glow light again. When satisfactory oper-ation is obtained go on to step 4.3.2.

4.3. 2 Rinse the built-in Cell Cup three times with the sample to be tested then fill with the sample at least 1/4 inch above the top electrode.

CAUTION: Never fill the cell by dipping the instrument into water!

Do not use withsamples hotter than 120'F (48 C).

Never measure a sample that has been left standing.

Excellent results can be obtained by holding the meter at an angle and, while pressing the button, allowing the sample to flow into the cell cup and out again, continuously purging through the cell.

However, be sure no bubbles are flowing through the cell.

ll/21/79 NUCLEAR CHEMISTRY PROCEDURE NC-81, PAGE 4 DETERMINATION OF CONDUCTIVITY Select the desired conductivity range. If the reading is off-scale on the "X 1000" range, the RE-10 Range Extender accessory can be inserted into the cell cup. This increases all ranges on the dial by a factor of ten.

4.3.3.1 Rinse the Range Extender with sample, and push it into the cell cup filled with fresh sample, seating the 0-ring seal.

4.3.3.2 Operate the meter in the normal manner, multiplying the reading by a factor of ten times the range.

Push the button and the pointer 'immediately indicates the specific conductivity of the sample in pmhos.

When finished with the instrument, rinse the cell cup with deionized water several times to eliminate build-up of dried salts, etc.

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