ML20080P466
| ML20080P466 | |
| Person / Time | |
|---|---|
| Site: | Catawba  |
| Issue date: | 12/11/1982 |
| From: | Evans L, Painter R, Tuckman M DUKE POWER CO. |
| To: | |
| Shared Package | |
| ML20080P419 | List:
|
| References | |
| CP-O-B-8150-04, CP-O-B-8150-4, NUDOCS 8402220554 | |
| Download: ML20080P466 (12) | |
Text
._
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Form 34731 (10-81)
(Formerly SPD 10021)
DUKE POWER COMPANY (1) ID No: cp/o/n/giso/04 PROCEDURE PREPARATION Change (s) D to PROCESS RECORD 0 Incorporated (2) STATION: Catawba (3) PROCEDURE TITLE: Chemistrv Procedure for the Determination of Dissolved Oxygen, Auto Analyzer (4) PREPARED BY: 2 DATE: A2khb (5) REVIEWED BY:
OOm DATE: /f- f -/ '
Cross-Disciplinary Review By:
h [r~T (6) TEMPORARY APPROVAL (IF NECESSARY):
By: (SRO) Date:
By: Date:
(7) A" PROVED BY: - -
MM Date: /1!tI!l1.
(8) MISCELLANEOUS:
Reviewed / Approved By: Date:
Reviewed / Approved By: _ Date:
MASiliR RLE 8402220554 840215 PDR ADOCK 05000413 E PDR
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Form 34624 (4-89) SPD-10012 DUKE POWER COMPANY NUCLEAR SAFCTY EVALUATION CHECK LIST (1) STATION: Catawba UNIT: 1 % 2 % 3 OTHER:
(2) CHECK LIST APPLICABLE TO: CP/0/B/8150/04 (3) SAFETY EVALUATION - PART A The item to which this evaluation is applicable represents:
Yes No / A change to the station or procedures as described in the FSA or a test or experiment not described in the FSAR7 ,
If the answer to the above is "Yes", attach a detailed description of the item being evaluated and an identification of the aff ected section(s) of the FSAR.
(4) SAFETY EVALUATION - PART B Yes No Will this item require a change to the station Technical Specifications?
If the answer to the above is "Yes," identify the specification (s) affected and/or attach the applicable pages(s) with the change (s) indicated.
(5) SAFETY EVALUATION - PART C As a result of the item to which this evaluation is applicable:
Yes No # Will the probability of an accident previously evaluated in the FSAR be increased?
Yes No / Will the consequences of an' accident previously evaluated i
in the FSAR be increased?
Yes No May the possibility of an accident which is different than any already evaluated in the FSAR be created?
Yes No . j Vill the probability of a malfunction of equipment important to safety previously evalusted in the FSAR be increased?
Yes No Will the consequences of a malfunction of equipment important to safety previously evaluated in the FSAR
/ be increased?
Yes No / May the possibility of malfunction of equipment important to safety different than any already evaluated in the FSAR be created?
Yes No Will the margin of safety as defined in the bases to any l Technical Spec'ification be reduced?
If the answer to any of the preceding is "Yes", an unreviewed safety question is involved. Justify the conclusion that an unreviewed safety question is or is not invedved. Attach additional pages as necessary.
(6) PREPARED BY: / -
DATE: / /- 2.
s n (7) REVIEWED BY: / Mvw DATE: /A-9-l'Z.
(8) Page 1 of I
l
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Fom 18855 (3-80)
DUKE POWER COMPAh7 ALARA EVALUATION CHECKLIST (1) Station Catawba Unit: 1 i 2 1 3 Other:
(2) Checklist Applicable to: CP/0/B/8150/04 (3) ALARA Evaluation Check those items below which were considered applicable during the preparation and review of this document.
Flushing and draining were used to minimize source - strength and con-tamination levels prior to performing an operation.
Permanent and/or movable shielding was specified for reduction of levels.
Use of permanent or temporary local exhaust ventilation systems was used for control of airborne contamination.
Operation was designed to be completed with the least practicable time spent in the radiation field.
Appropriate tools and equipment were specified for the operation to be performed.
The operation was designed considering the minimum number of people necessary for safe job completion.
Remote handling equipment and other special tools were specified to reduce external dose, i
l Contamination - control techniques were specified.
l The operation was designed to be conducted in areas of as low an
, exposure as practicable.
l l
Additional ALARA considerations were:
l
/ ALARA Principles were not considered since the procedure did not involve work in a r&diation area.
(5) Prepared by: /I Date / [' 2 (6) Reviewed by: j6m Date /2 -f .TJ--
i
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CP/0/B/8150/04 DUKE POWER COMPANY CATAWBA NUCLEAR STATION CHEMISTRY PROCEDURE FOR THE DETERMINATION OF DISSOINED OXYGEN, AUTO ANALYZER l.0 DISCUSSION 1.1 Scope This procedure describes the determination of dissolved oxygen in high purity water using the Weston and Stack Continuous Flow Analyzer.
1.2 Principle Dissolved oxygen in the high purity water sample diffuses through a semipermeable membrane which retains an electrolyte. Tee electrolyte surrounds a platinum and a lead electrode (Enclosure 6.2). Oxygen in the sample undergoes reduction a: the platinum electrode (or cathode) to form hydroxyl ions (Enclosure 6.1):
~
0 2 + 2 H2O + 4e'
- 4 OH i
The hydroxyl ions formed simultaneously undergo oxidation at the lead electrode (or anode) to form an oxide (Enclosure 6.1):
~
2 Pb + 4 OH
- 2 Pb0 + 2 H2O + 4e' Since the anode and ::athode are connected through an external circuit, a current is produced due to transfer of electrons. This current is related to the dissolved oxygen content in the water and is detected and measured by a sensitive amp meter in the analyzer.
l The oxidation - reduction reaction occurring in the sensor requires an applied potential of 0.5 volts or greater. The cathode and anode materials are therefore selected such that a generated or " galvanic" potential existing between the two metals will be adequate to support the oxidation - reduction reaction.
Compounds present in the electrolyte do not undergo oxidation -
reduction reactions at the potential of the probe; therefore, when oxygen is absent, a current does not flow and the reading frem the probe is zero.
The sample flow cell provides for a turbulent' flow past the probe
( membrane. Good agitation is required to minimize the resistance to oxygen transfer from the sample to the cathode.
Temperature variations of the sample are corrected for by the use of a thermistor. All samples pass through sample cooling heat exchangers to adjust temperature to 77'F prior to entering the probe.
CP/0/B/8150/04
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Paga 2 of 4 1.3 Precision and Interferences 1.3.1 System accuracy with automatic temperature compensation is i i percent of the reading for sample temperatures within 10*C (50*F) of the calibration temperature.
1.3.2 The only known interference to the Weston and Stack D.O.
probe is free chlorine. If the sample is alkaline se that hypochlorous ion exists rather than free chlorine, there is no interference.
The following do not interfere: hydrogen, hydrogen sulfide, sulfur dioxide, ammonia, carbon monoxide, carbon dioxide, and hydrazine.
1.3.3 Unless sufficiently agitated, the sample flow forms a stagnant film of deoxygenated water that will act as a diffusion barrier for dissolved oxygen.
1.4 Limits and Precautions 1.4.1 The formation of a coating (collodial iron hydroxide or rust particles) on the membrane decreases probe sensitivity.
1.4.2 The life of a membrane is more than six months when it is in constant use, as long as membrane damage does not occur.
1.4.3 When changing the membrane on the probe be careful to insure that there are no internal deposits of crystalized electrolyte or oxidised deposits on the anode that could puncture the membrane.
1.4.4 The probe will stabilize in 1 - 2 hours2.314815e-5 days <br />5.555556e-4 hours <br />3.306878e-6 weeks <br />7.61e-7 months <br /> after changing the electrolyte and membrane. If the anode is cleaned at this time, 24 hours2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br /> is required for stabilization.
l 1.4.5 Minimum flow through the sample flow cell is 150 ml/ min I
when using a 1 mil membrane, l
- 1.4.6 Air inleakage into the system must be avoided.
I 1.4.7 The recommended sample temperature is 50*C (122*F).
1.4.8 The probe must be recalibrated anytime the membrane is changed.
2.0 APPARATUS
! 2.1 Weston and Stack Analyzer - Model 3400-5 l
2.2 Weston and Stack Model 60 Probe 2.3 Weston and Stack Model 152 Thermistor
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CP/0/B/8150/04 Paga 3 of 4 2.4 Weston and Stack Model 192 Sample Flow cell 2.5 Teflon Membranes - 1 or 2 mil 3.0 REAGENTS 3.1 Potassium Iodide Electolyte Dissolve 50 grams of potassium iodide and 0.1 gram of sodium sulfite in 100 ml of domineralized water. Electrolyte is commercially available from Weston and Stack in 32 ounce bottles, part number 096-003.
4.0 PROCEDURE 4.1 Preparation of the Probe 4.1.1 Disassemble the probe as shown in Enclosure 6.2. Place the membrane, item No. 2 in the stainless staal holder, item No. 1.
4.1.2 Screw cap onto end of outer housing, item No. 3. Be careful not to overtighten.
4.1.3 Holding housing vertically, add approximately 100 ml of electrolyte (Section 3.0).
4.1.4 Slowly insert inner electrode, item No. 4, into the outer housing assembly.
4.1.5 Replace three screws and small nylon air bleeder screw.
NOTE: Air bubbles may tend to collect at the tip and around the lead anode. Gentle tapping of the probe will usually free these so they will escape to the top of the probe.
4.2 Calibration (Weekly) 4.2.1 Remove oxygen probe and thermistor from respective sample walls. Carefully wipe dry.
! 4.2.2 Place the function switch (Enclosure 6.4, Item No. 4) in i .
the "ZER0" position. Adjust the "ZER0" control (Enclosure 6.4, Item No. 3) for a zero reading.
I 4.2.3 Turn the function switch to the calibration position and adjust the " CAL" control (Enclosure 6.4, Item No. 2) until the meter reads full scale.
4.2.4 Recheck zero and adjust as necessary. If adjustment is necessary, place selector switch to " CAL" control and check for full scale deflection.
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s CP/0/B/8150/04 Pegs 4 of 4 4.3 Standardization (Daily) 4.3.1 Turn selector switch to desired readout.
4.3.2 Replace probe and thermistor into sa=ple wells.
4.3.3 Start sample flow to the probe chamber by throttling flow through the following valves for the designated sa=ple:
Unit 1 Unit 2 Hoewell Pump Discharge ICT64 2CT64 Final Feedwater ICT70 2CT70 Patch Sample ICT202 For a 1 mil membrane, sample flow must be a mininum of
, 150 ml/ min.
4.3.4 Record concentration as shown on recorder.
4.3.5 Collect a sample and run manual D. O. as per CP/0/A/8100/11.
4.3.6 Adjust the oxygen meter to the actual dissolved oxygen concentration in the sample using the " CAL" control.
4.4 Determination of Unknown Concentration 4.4.1 Set the D.O. analyzer readout scale to the correct range.
4.4.2 Check sample flow and temperature to insure proper performance.
4.4.3 Read D.O. concentration shown on recorder.
5.0 REFERENCES
5.1 Instruction Manual for Model 3400-5 Dissolved Oxygen Analyzer -
Weston and Stack Instruments.
5.2 MNS Procedure for the Determination of Dissolved Oxygen in High Purity Water - CP/0/3/8100/17.
- 6. 0 ENCLOSURES ,
6.1 Principle of Weston and Stack Molecular Oxygen Probe.
6.2 Model 60 Probe and Flow Cell.
6.3 Flow Rate - Response Graph.
6.4 Model 3400-5 Front Panel Controls.
' Enclosura 6.1 CP/0/n/8150/04 Principio of Waston and Stack Molecular Oxygen Probe s siea f-Amp Meter Electrical Current h
-i
-n Lead Anode,
(
2Pb + 405,-+ 2Pb0 + =
H O + 4e --
Platinum Cathode~
2 02 + 2H2O + 4e -A 40H"
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'~ I II' +" Potassium Iodide Electrolyte with Dissolved Ox-Internal Galvanic Potential - 0.5 V
_ Enclousta o.2 rue 1 of CP/0/B/8150/04 Wanton and Secck Model 60 Probe i I
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Enclosura 6.3 CP/0/B/8150/04 Flow Rate / Response for Weston and Stack Dissolved Oxygen Probe i i l l l , ,
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SAMPLE FLOW - ml/ MIN .
e Enclosure 6,4 '
P/0/B/8150/04 ,
Weston and Stack Model 3400-5 Front Panel Controls 5 POWER SVVITCH 6 REC.ADJ.
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