ML20038B413

Nuclear Chemistry Procedure NC-2, Schedule for Periodic Tests.

ML20038B413
Person / Time
Site:	Turkey Point
Issue date:	07/30/1981
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-2, NUDOCS 8112080196
Download: ML20038B413 (16)

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'

. ,,' s' FLORIDA POWER AND LIGHT COMPANY TURKEY POINT UNITS 3 AND 4 NUCLEAR CHEMISTRY PROCEDURE NC-2 JULY 30, 1981

1.0 Title

SCHEDULE FOR PERIODIC TESTS f

2.0 Approval and List of Effective Pages:

2.1 Approval

Change Dated 7/30/81 Reviewed by Plant Nuclear Safety Committee: 81-53 and Approved by Plant Manager - Nuclear: 7/30/81 2.2 List of Effective Pages:

Page Date Page Date Page Date 1 7/30/81 3 7/30/81 5 7/30/81 2 7/30/81 4 7/30/81

3.0 Scope

3.1 Requirements

Items denoted as Technical Specification items on the schedule are required for compliance with Technical Specifications and shall take precedence over all other items on the schedule.

3.2 Purpose

This procedure provides a schedule for periodic and routine sampling frequency for the various systems associated with the operation of Units 3 and 4.

4.0 Instructions

4.1 Sampling and testing of systems in service shall be scheduled in accordance with the periodic test schedule, Table I.

4.2 Except for Technical Specification requirements, deviations from this schedule may be made when authorized by the Nuclear Chemistry Supervisor and/or the Radiochemist.

8112080196 811202 PDR ADOCK 05000250 P PDR m __

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7/30/81 NUCLEAR CHEMISTRY PROCEDURE NC-2, PAGE 2 .

SCHEDULE FOR PERIODIC TESTS - ,

TABLE I PERIODIC TEST SCHEDULE (NORMAL OPERATION) t

TEST Cat- Free Susp.

SYSTEM pH ion Na + Cl - SiO 2 OH- NH3 02 Solids NN 24 Cond Fe Cu 0-P0 4 T-P0 4 .Cr04 Cond Steam Generators D D D D D AN AN 2M M AN I Feedwater D AN D D D D D Condensate D D D D l Condensate Storage Tank W I W W W AN M  ! I l l Main Steam Air Ejector Vent Turbine Plant Cooling Water W l l W W W IW anergency Diesel M M Condensate Recovery Tank Sanitary Tank Potable Water Storm Drains I S/G Draindown Releases WTP - Coagulator D WIP - Anion and Mix Beds D D D l l WTP - Carbon Filters ,

I l l

LEGEND:

D: Daily W: Weekly 2Y: 2 times / year Note: Number - Letter designations outside of SW: 5 times / week 2M: 2 times / month AN: As necessary parentheses indicate Tech. Spec. require-3W: 3 times / week M: Monthly *: Tech. Spec. Items ment for minimum sampling frequency; 2W: 2 times / week Q: Quarterly Number - Letter designations inside of parentheses indicate recommended minimum-sampling frequency.

7/30/81 -

NUCLEAR CHEMISTRY PROCEDURE NC-2, PAGE 3 .

SCHEDULE FOR PERIODIC TESTS .

TABLE I (Cont'd)

PERIODIC TEST SCHEDULE (NORMAL OPERATION)

TEST Gross T Gross Sr-89 Hard Turb - Fuel Oil SYSTEM 8-7 H-3 I-131 Spec a Sr-90 PA TA ness idity Cl 2 Inventory

, Sep'n Steam Generators D W W* 3W Feedwater  ! I Condensate Condensate Storage Tank ,

Main Steam W AN Air Ejector Vent AN l  ! l furbine Plant Cooling Water AN Emergency Diesel '

W* I Condensate Recovery Tank D , i l Sanitary Tank M Potable Water M i I Storm Drains M I l l S/G Draindown Releases AN AN AN AN WIP - Coagulator D D D D WTP - Anion and Mix Beds

__WTP - Carbon Filters D LEGEND:

D: Daily W: Weekly 2Y: 2 times / year Note: Number - Letter designations outside of SW: 5 times / week 2M: 2 times / month AN: As necessary parentheses indicate Tech. Spec. require-3W: 3 times / week M: Monthly *: Tech. Spec. Items ment for minimum sampling frequency; 2W: 2 times / week Q: Quarterly Number - Letter designations inside of parentheses indicate recommended minimum sampling frequency.

7/30/81 .'

NUCLEAR CHEMISTRY PROCEDURE NC-2, PAGE 4 ,

SCHEDULE FOR PERIODIC TESTS -

TABLE I (Cont'd)

PERIODIC TEST SCHEDULE (NORMAL OPERATION)

Susp.

TEST Solids SYSTEM pH Cond B Cl - F- 0 2

H 2

N 2

Li Cation Total or SiO 2 Cr0 4 Zeo-Cond. Solids Crud lites Reactor Coolant D D 2W*(D) SW*(D) 5W*(D) SW*(D) 3W 2W 2M M M Pressurizer Liquid D D D 2W 2W 2W 2W 2W RCS Demin-Outlet W AN W W W RHR (when in service) I D D 2W*(D) SW*(D) 5W*(D) 5W*(D) 2M W PWST 3W 3W 3W 3W 3W 3W M 3W M RWST W W W* W W M M M SFP W W W* W W 1 M SFP Demin. Inlet W W W I i j 1 1 ' j l SFP Demin. Dutlet W W l 1 1 Pressurizer Relief Tank W W Wl ,

I I VCT Gas Space W i W W i l l l l l Gas Decay Tank l l l Accumulators M*(2M) 2M 2M Boric Acid Storage Tanks 2W*(3W) W W M M Boron Injection Tank M*(2M)

Component Cooling Water W W W W W Containment Atmos. (Gas)

Cont. Atmos.(Olar/Part Filt.)l Plant Vent Charcoal Filter ,

Plant Vent Part. Filter SFP Charcoal Filter SFP Part. Filter Liquid Release Weekly Comp. I l 1 l 1 Liquid Release ebnthly Comp. M Typical Liquid Release (Gas)

Bner. Cont. Char. Sury. Spec.: I l l LEGEND:

D: Daily W: Weekly 2Y: 2 times / year Note: Number - Letter designations outside of SW: 5 times / week 2M: 2 times / month AN: As necessary parentheses indicate Tech. Spec, require-3W: 3 times / week M: Monthly *: Tech. Spec. Items ment for minimum sampling frequency; 29: 2 times / week Q: Quarterly Nunber - Letter designations inside of parentheses indicate recommended minimum sampling frequency.

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i NUCLEAR CHEMISTRY PROCEDURE NC-2, PAGE 5 -

j SCHEDULE FOR PERIODIC TESTS -

! TABLE I (Cont'd)

PERIODIC TEST SCHEDULE (NORMAL OPERATION) ,

7-Day 7-Day Crud, Ex- 1-131 Sr-89 -

TEST Gross Rad Y Gross Gross Gross Change and and Gross Iodine j SYSTEM s-y H-3 Chem l[ Spec . 8-V a a Filter Part. Sr-90 .a Removal Sep'n i Reactor Coolant SW*(D) W* M* 2Y* D 2M

Pressurizer Liquid i RCS Demin-Outlet W RHR (when in service) 5W*(D) W* M* 2Y* 2M PWST W W RWST W I W

SFP W W i SFP Demin. Inlet W

j. SFP Demin. Outlet W I Pressurizer Relief Tank i VC1 Gas Space '

M Gas Decay Tank AN* AN* AN*

I Accumulators i

Boric Acid Storage Tanks W Boron Injection Tank j Component Cooling Water W W r Containment Atmos. (Gas) W AN*(W)

Cont. Atmos.(Char /Part. Filt.T AN*

Plant Vent Charcoal Filter W* W*

l Plant Vent Part. Filter W* W W W* Q*(M)

SFP Charcoal Filter W* W*

SFP Part. Filter W* W W W* Q*

Liquid Release Weekly Comp. !W W*

Liquid Release (bnthly Comp. M* M* M* M*

Typical Liquid Release (Gas) M*

Emer. Cont. Char. Sury. Spec. Q* r LEGEND:

D: Daily W: Weekly 2Y: 2 times / year Note: Number - Letter designations outside of SW: 5 times / week 2M: 2 times / month AN: As necessary parentheses indicate Tech. Spec. require-3W: 3 times / week M: Monthly *: Tech. Spec. Items ment for minimum sampling frequency; 2W: 2 times / week Q: Quarterly Number - Letter designations inside of parentheses indicate recommended minimum sampling frequency.

Nuclear Chemistry Department Instruction Plant Cold Shutdown - Secondary Systems

1. Verify:

a. A sufficient amount of hydrazine and ammonium hydroxide is on hand to place steam generat ors in wet layup.

b. Chemical feed isolation valves to feedwater (steam generators) are open -

valve numbers 134, 234, 334.

c. Chemical addition tank supply water is lined up to the unaffected unit.

NOTE: With both units shut down, fill water can be obtained by lining up to #3 CST.

2. Prior to shutdown, isolate a hydrazine tank and add approximately 15 gallons of approximately 35% hydrazine to the isolated tank.

3. When load reduction is commenced:

a. Increase stroke on feedwater hydrazine pump to approximately double the concentration.

b. The hotwell pumps should be stopped and isolated.

c. Secure the hydrazine analyzer.

4. When the main feedwater pumps have been secured:

a. Secure feedwater hydrazine and ammonium hydroxide chemical feed pumps.

b. Begin pumping dilute concentration of hydrazine into the steam generators using the steam generator chemical feed pumps.

c. Isolate condensate and steam generator cation resin columns.

5. Whenever possible, a steam generator blowdown should be maintained throughout the cooldown.

6. Monitor steam generators periodically to determine the effectiveness of hydrazine addition.

7. When RHR is placed in-service, approximately 350* prinary system temperature, secure pumping dilute hydrazine to the steam generators and commence pumping the concentrated hydrazine equally to each of the steam generators.

a. When the tank is nearly empty, refill and pump again.

8. Secure steam generator chemical feed pumps and isolate.

9. If the steam generator recirculation system is available:

a. Further addition of chemicals may be deferred until addition can be made

with the steam generator recirculation system. .

b. Once the steam generators have been filled, have the steam generator recirculation system placed in service.

1. Add 15 gallons of hydrazine plus 3 gallons of ammonium hydroxide to each steam generator during recirculation.

2. Allou a recirculation time of one hour following chemical addition.

c. Following chemical addition to all steam generators in wet layup:

1. The steam generator recirculation system should be placed in continuous service.

2. Recirculate each steam generator for one shift (8 hours9.259259e-5 days <br />0.00222 hours <br />1.322751e-5 weeks <br />3.044e-6 months <br />) alternating between each steam generator in wet layup every 8 hours9.259259e-5 days <br />0.00222 hours <br />1.322751e-5 weeks <br />3.044e-6 months <br />.

3. A sample from each steam generator that has had chemicals added should be collected and analyzed near the end of its first 8 hour9.259259e-5 days <br />0.00222 hours <br />1.322751e-5 weeks <br />3.044e-6 months <br /> recirculation period,

a. Additional chemicals should be added as necessary.

4. Following the initial sample, steam generators in wet layup should be sampled at least weekly. Samples should be collected near the end of a recirculacion period.

10. If the steam generator recirculation system is unavailable:

a. Chemicals should be added via the condensate transfer pump during fill.

b. Sample for all steam generators placed in wet layup should be collected and analyzed as soon as practicable following layup of the steam generator and at least weekly thereafter. ,

Discussion: Plant Cold Shutdown - Secondary Systems.

1. Whenever possible, advance preparations for an evolution can be the means to avoid unnecessary aggravation.

2. Concentrated hydrazine is pumped to the steam generators as a means of scavenging oxygen. Preparing for the addition of hydrazine before shutdown will allow more time for other evolutions of the shutdown where time is a factor.

3. The stroke on the feedwater hydrazine pump is increased so that as load is decreased, the corresponding load following signal will not result in a complete loss of hydrazine being pumped to the steam generators. The hydrazine analyzer and hotwell sampling pumps are secured and isolated at this time from a convenience standpoint since waiting until a later time could result in forgetting to properly secure these systems.

4. When the main feed pump is secured, feed to the steam generators is supplied from one of two possible sources,

a. Supply from 3 and 4 condensate storage tank - This supply of water consists of secondary side quality makeup water that is air saturated. Use of this as a supply source requires the use of auxiliary feed water pumps in order to boost the pressure to that of.the steam generators.-

b. Supply from' Units 1 and 2 - This supply is fed from the feedwater pump casing on Unit 2 through cross ties to the' steam generators of Unit 3 or 4. This water is treated chemically with hydrazine by 1 and 2 Results.

Normally, for a cold shutdown process, water will be supplied from the conden-sate storage tank (feed from 1 and 2 is supplied at approximately 500'F).

Therefore, a dilute concentration of hydrazine is fed to each steam generator to scavenge oxygen that can enter the steam generators from.the makeup source.

Flow to the steam generator cation conductivity columns is secured to avoid passing hydrazine through them.

4.--

5. A steam generator blowdown is desirable at this time because solids that are in the steam generators wi'.1 begin to reappear.' However, the question of the blowdown is also dependent upon other factors. For instance,'if there is a primary to secondary leak in a steam generator, -the desirability of a continuous blowdown for that steam generator should be dependent upon the radioactivity considerations.

6. Samples for hydrazine and oxygen should be collected.

7. Concentrated hydrazine is pumped to the steam generators in preparation for filling near the wet layup level from the oxygenated source. This addition is made at approximately 350' so that oxygen scavenging will be efficient.

8. The steam generator recirculation system is the preferred method for chemical addition due to the availability of chemical mixing.

,Nucicer u. cms;;try Dep Jrgment lust ras t ion Plant Hetup frr, Cold Shutdown - S;condcry Synta C

( l. Prior to fill and vent of primary system, individual hot well pumps should be checked to insure proper operation. During punp checks, samples of the individual hot wells should be drawn. These sampics should be checked for chlorides and visible crud. If detectabic chlorides or excessive crud occurs, notify chemistry supervisor and shif t supervisor.

2. As the primary side heatup commences, blowdowns will be initiated. Note time and total blowdown rate for the radiochemist. Insure the R-19 process radiation monitor is in service.

3. As heatup continues, feed to the generators will be established. Determine the source of feedwater. If the feed is f rom 1 and 2, the water is chemically treated and no chemical addition is necessary. If the source is the CST (aux feed pumps will be used) it will be necessary to feed hydrazine to the generators using the Yarway pumps. Check generators for Cl and hydrazine during this period.

4. k' hen a condensate pump is started, the condensate cation conductivity header should be aligned and started. Check the conductivity on the control room conductivity chart.

5. As heatup continues, check the generators for hydrazine. k' hen the concentrations are low (=300 ppb) initiate flow through individual steam generator cation conductivity cells. Monitor the conductivity chart in the control room.

( 6. k"ocn a vacuum is drawn on the condenser, place the individual hot well pumps in service and monitor the conductivity chart in the control room. This is the critical time for detection of tube leaks; frequent monitoring is a necessity.

High or increasing conductivities should be checked out thoroughly and reported to the chemistry supervisor and the shif t supervisor. If a leak is present, monitor steam generator chorides as well.

7. k' hen a normal feed train is established, bet;in chemical feed with the Lapp pumps. Pump at maximum stroke. As power is increased, reduce pump stroke to p reven t pump damage. Monitor feedwater and steam generator chemistry,

8. Start hydrazine analyzer.

9. Monitor oxygen in condensate. If greater than 5 ppb af ter 24 hours2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br />, an air leak is present, notify chenistry supervisor.

10. k' hen the second condensate pump is put in service, establish flow through the second condensate conductivity cell.

Discussion

1. Anytime the condenser undergoes a thermal change, there is a chance for tube damage to occur. The earlier a chloride problem is detected, the casier it is to correct. For prolonged outages such as refueling and when the conden-sate side is open to atmosphere, chances for crud due to oxidation of the metals

( is likely. Should excessive crud or chlorides be detected, corrective measures may need to be taken. These may include searching for tube leaks and draining of the condenser boxes (24 hours2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br />). Most condenser leakt, are not detected, however, until a vacuum is drawn. (Sce step 6).

.Nucicar Cehmistry Department Instruction Plant llcatup from Cold Shutdown - Secondary System Peg 2 2 .

' 2. The initiation time and total blowdown are required by the radicchemist to account for blowdown activity. Should the startup come after a primary to secondary leak, isotopic activities are requested. These isotopic activities can usually be gotten from the liquid releases used to bring generators to operating 1cvel. If, however, no previous samples were taken, they should be run.

3. To pump hydrazine, start 1, 2 or 3 pumps as necessary and pump to the individual generators. Pump with normal concentrations, do not isolate the tanks. Refer to appropriate diagrams for line ups. If pressure indicated =1500 psi on gage, chemical feed isolation valves to feedwater 134, 234, 334 are secured, ask the watch engineer to have them opened. Because of uneven flow paths and only periodic injection, it may be necessary to adjust flows and throttle injection to individual generators.

4. When the condensate pump is started, conductivitics u111 increase. If excessive, monitor closely.

5. Execss hydrazine will damage resin. High hydrazine concentrations may occur because the steam generators were in vet lay up. Check for hydrazine before put ting the steam generator cation conductivity system in service.

6. Normally a vacuum is drawn sometime af ter the steamlincs have begun heating (usually between 400*F and 550*F.) When the vacuum is drawn on the condenser, the pressure on the seawater side becomes considerably larger than on the idI condensate side. If any tube Icaks are present, seawater vill be forced into

'*' the condensate side. A tube Icak is indicated if one of the four individual wells shows a higher conductivity than the rest. Insure the probicm is not due to bad resin or to a bad conductivity cell before reporting that a leak is present.

7. Pumps follow the power load, at zero power the chemical addition is small.

It is normally difficult to elevate pH to proper level and to obtain a detect-able hydrazine concentration. Do not " worry" as power is ramped, pil and hydra-zine levcis should rise. If they don't, you should increase the doping con-

' centration or try using two pumps.

9. Many times af ter the unit has been shutdown and work is done on the condenser, drain lines etc, arc opened. If these are not all secured prior to startup, they are an easy sourra of air Icaks. Many other sources also exist, i

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FLORIDA POWER & LIGHT COMPANY NUCLEAR PLANT CHEMISTRY SPECIFICATIONS Plant - Turkey Point, Unit 3 Systen - Condensate

1. Chemistry Specification pH 9.0 - 9.6 9 25"C Total 3.0 - 11.0Amhos/ca 0 26*C Chloride (0.15 ppm Oxygen <0.010 ppm II. Chemistry Control Additives Amnonium Hydroxide - Specification PRN78 NUC-AMM, Rev. O Catalyzed Hydrazine - Specification PRN70 NUC-HYDRA, Rev. O III. Bases A. Specification

1. pH - The specification for pH is based on corrosion curves for o ferrous teedwater system.

2. Total Conductivity - This specification is derived troa theoretical curves of pH vs. conductivity tron emmonia solutions.

3. Chloride - The specification for chloride is based on providing adequate corrosion protection to insure the structural integrity of t he s t ea:.1 generator.

4. Oxygen - The speci tication for oxygen is based upon its known effects to corrode metal by means of oxidation. In many instances the corrosivity ot known deleterious udterials is increased due to the presence <>t oxygen.

B. Control Chemicals

1. Ammonium Hydroxide - A volatile additive used for pH control.

Ammonium hydroxide is carried over in the steam, maintaining on alkallne pH throughout the systea.

2. Catalyzed Hydrazine - A strong reducing agent added to the systen to scavenge oxygen. It diso contributes to the NH 3 inventory due to thermal degradation.

CHEM-SPEC Revisicn 11/2/81

FLORite POWER & LIGHT COMPANY NUCLEAR PLANT Cl!EMISTRY SPECIFICATIONS Plant - Turkey Point, Unit 3 System - Feedwater

1. Chemistry Specification pH 9.0 - 9.6 9 26"C Total Conductivity 3.0 - 11.0 etmhos/an U E5"C Ammonia Consistent with pH Hydrazine lop] + 2.0.010 ppm Oxygen <.005 ppa Iron <0.010 ppm II. Chemistry Control Additives Ammonium Hydroxide - Specification PRN/8 NUC-AMM, Rev. O Catalyzed Hydrazine - Specification PRN/8 NUC-HYDRA, REV. O III. Bases A. Speci fica tions

1. pH-The specification is based on corrosion curves for a terrous feedwater system.

2. Total Conductivity - This specification is derived tron theoretical curves at pH vs. conductivity for ammonia solutions.

3. Ammonia - The specification for emmonia is to insure that pH is consistent with the value that is expected based upon the concentration of ammonia.

4. Catalyzed Hydrazine - For power operation it is recommended that a hydrazine residual of 2,0.010 ppm in excess of the feedwater oxygen be maintained down stream et the highest pressure feedwater heater.

S. Oxygen - The specification for oxygen is based upon its known effects to corrode metal by means of oxidation. In many instances the corrositivity of known deleterious materials is increased due to the presence of oxygen.

6. Iron - The speci fication is not intended as a control value, but is intended to indicate a point above which some system abnonnali ty may exi st.

CHEM-SPEC Revision 11/2/81

B. Control Chenicals

1. Ammonium Hydroxide - A volatile additive used for pH control.

Anmonium hydroxide is carried over in the steam, maintaining an alkaline pH throughout the systen.

2. Catalyzed Hydrazine - A strong reducing agent added to the system to scavenge oxygen. It also contributes to the flH 3 inventory due to thennal degradation.

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l l CHEM-SPEC Revision 11/2/81

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FLORIDA POWER & LIGli COMPANY NUCLEAR PLANT CHEMISTARY SPECIFICATIONS Plant - Turkey Point, Unit 3 System - Steam Generator - Hot Steaming

1. Chemistry Specifications pH U.5 - 9.6 9 25"C Cation Conductivity <2.0 ,4mhos/cm (d 25"C Sodium <0.10 ppm Chloride (0.15 ppu Free Hydroxide <0.15 ppm Aumonia Consistent with pH Oxygen <0.005 ppm Silica <l.0 ppm Suspended Solids <l.0 ppa (.45 micron tilter)

Gross Monitor Tritium Monitor

11. Chemical Control Additives Amnonium Hydroxide - Specification PRN78 NUC-AMM, Rev. O Catalyzed Hydrazine - Specification PRN78 NUC-HYDRA, Rev. O 111. Bases A. Specification

1. pH - The speci fication for the pH range is based on miniinizing corrosion of the steam generators materials and turbine cycle and providing a means whereby perturbation to the steam generator chemistry froa sources such as condenser leakage can be recognized.

2. Cation Conductivity - The specification is based on being able to detect low ievel contaminants concentrating in the stea:n generator which are acid tonning in nature.

3. Sodium - The chemistry specification for sodlum is based on reducing the susceptibility of causing caustic stress assisted corrosion cracking.

4 Slica - The chenistry specification for silica is based on limiting its concentration in the stean and avoiding silica deposits on turbine blades and valves.

CHEM-SPEC Revision 11/2/81

S. Chloride - The specification for chloride is based on providing adequate corrosion protection to insure the structural integrity of the steam generator since AVT control provides no buf tering protection tron acid chloride attack.

6. Free Hydroxide - The specification is based on the potential for caustic stress assisted corrosion cracking of the inconel 600 steam generator tubes.

7. Ammonia - The speci fication for a:amonia is to insure that the pH in the steam generator is consistent with the value that is expected based upon the concentration of ammonia.

8. Oxygen - The specification is based upon its known ef fects to corrode metal by means of oxidation. In many instances the corrosivity of known deleterious material is increased due to the presence of oxygen.

CHEM-SPEC Revision 11/2/81

FIDRIDA POWER E LIGHT COMPANY

. +\

• NUCLEAR PIANT CHE:4ISTRY SPECIFICATIONS

• t Plant - Turkey Point, Units 3 & 4 system - Steam Generators - Wet Lay Up I. Chemistry Specification -

pH 10.0 - 10.5 @ 25 0C Chloride <0.5 ppm Hydrazine 75 - 150 pIxn

. Free Hydroxide Not Detectable II. Chemistry Control Additives Ammonium Hydroxide - Specification PRN78 NUC-AMM, Rev. O Catalyzed Hydrazine - Specification PRN78 NUC-HYDRA, Rev. O III. Bases A. Specification

1. pH - The specification for pH under wet lay up condition is based on minimizing corrosion to the metal content of the steam generators.

2. Chloride - The specification for chloride is based on providing adequate corrosion protection to insure the structural integrity of the steam ga.nerator.

3. Catalyzed Hydrazine - The specification for hydrazine is based on the exclusion of oxygen from the steam generators internals to prevent corrosive attack.

4. Free Hydroxide - The specification is based on the potential for caustic stress assisted corrosion cracking of Inconel 600 steam generator tubes.

B. Control Chemicals

1. Ammonium Hydroxide - A volatile additive used for pH control. Ammonium hydroxide is carried over in the steam, maintaining an alkaline pH g( throughout the system.

4 Catalyzed Hydrazine - A strong reducing agent added to the system to 2.

scavenge oxygen. It also contributes to the NH3 inventory due to thermal degradation.