ML17341A693

Nuclear Chemistry Procedure NC-97, Determination of Hydrazine Concentration.

ML17341A693
Person / Time
Site:	Turkey Point
Issue date:	10/01/1979
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-97, NUDOCS 8112080242
Download: ML17341A693 (8)

Text

FLORIDA POHER & LIGHT COIPANY TURKEY POINT UNITS 3 AND 4 NUCLEAR CHEMISTRY PROCEDURE NC-97 OCTOBER I, l979

1.0 Title

DETERMINATION OF HYDRAZINE CONCENTRATXON 2-0 A royal and List of Effective Pa es:

2.1 Review and A royal:

Consultant Date Consultant Date Radiochemiqt ate Tech Supv Date Plt Supt Nuc Date Approved by ant Nucle Safety Committee Date 2.2 List of Effective Pa es:

Date ~Pa e Date IO/I/79 3 IO/I/79 IO/I/79 a

3.0 ~0to e:

Hydrazine is added to the feedwater to control oxygen and should be maintained at a concentration at least 5 ppb higher than the dissolved oxygen concen-tration.

3.2 ~Pnt oee:

This procedure provides instructions for the determination of hydrazine concentration in plant water samples.

4.0 Xnstructions

4.1 Precautions

4.1.1 'Obtain all samples in polyethylene bottles and minimize their exposure to air.

4.1.2 Allow the sample streams to flow for an adequate time to insure that the samples will be representative and not turbid.

4.2 ~2ea ento:

Refer to "Preparation of Reagents" for Nuclear Chemistry at Turkey Point.

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Il CHEMISTRY PROCEDURE NC-97, PAGE 2

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IO/I/79 DETERMINATION OF HYDRAZINE CONCENTRATION 4.3 Sam le Pre aration:

4.3.1 Transfer each of the following into separate 125 ml Erlenmeyer flasks:

a. 100 ml sample

b. 100 ml deionized water (blank)

c. 100 ml of each of two standards at 50 ppb and 100 ppb concentra-tion (see 4.4.4 and 4.5.6) 4.3.2 Add 5 ml of DAB reagent to each flask. Swirl and stopper the flasks.

4.3.3 Let stand for 15 minutes but not more than 100 minutes.

4.3.4 Hhile waiting for color development go on to step 4.4 or 4.5.

4.4 Usin the S ectronic 70:

4.4.1 Turn on instrument and allow 5 minutes for warm up.

4.4.2 Set wavelength at 458 nm.

4.4.3 When

'lank ready to read'he samples, fill this to zero the instrument.

a 20 mm optical cell with the and use 4~4~4 Perform a two point standardization using the 50 ppb and 100 ppb standards. Read and record the absorbance readings. The value of the 50 ppb standard should be 50% of the 100 ppb standard +10%.

If this result is not obtained, notify the lab supervisor or his designee. If a two point standardization has been run earlier in the day, a single standard is sufficient.

4.4.5 Read the remaining samples and use the following formula to determine hydrazine concentration in ppb:

absorbance unknown x ppb N2H of standard ppb N 2 H 4 unknown = absorbance'f standard 4.4.6 Record results.

4.5 Usin the S ectronic 100:

NOTE: The electronic calibration of the Spec 100 should be performed daily as per the Spec 100 calibration card in the tickler file.

4.5.1 Turn on instrument and allow-5 minutes for warm up.

4.5.2 Set wavelength for 458 nm.

4.5.3 5/hen blank, ready to read the samples, set'he mode selection filla 20 mm knob to absorbance optical cell with the and zero the instrument.

'I NUCLEAR CHEMISTRY PROCEDURE NC-97, PAGE 3 10/I/79 DETERMINATION OF HYDRAZINE CONCENTRATION Fill a 20 mm optical cell with the high standard. Turn the mode selection knob to concentration with the decimal in the desired location.

Adjust the concentration to the value of the high standard using the concentration adjust knob.

Fill a 20 mm optical cell with the low standard and read the value.

The low standard should read 50% of the high standard +10%. If this result is not obtained, notify the lab supervisor or his designee.

If a two point standardization has been run earlier in the day, one standard is sufficient.

Read the N2H4 concentration of the remaining 'samples directly and record the results.

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