ML20245B410
| ML20245B410 | |
| Person / Time | |
|---|---|
| Site: | Browns Ferry, Sequoyah, 05000000 |
| Issue date: | 01/19/1989 |
| From: | Buggs E AFFILIATION NOT ASSIGNED |
| To: | Partlow J Office of Nuclear Reactor Regulation |
| Shared Package | |
| ML20245B391 | List: |
| References | |
| NUDOCS 8906230166 | |
| Download: ML20245B410 (38) | |
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409 Cameron Circle # 2402 Chattanooga, TN 37402 l January 19, 1989 Mr. James G. Partlow, Director of Special Projects Nuclear Regulatory Commission one-White / FLINT North 1155 Rockville Pike Rockville, Maryland 20852
Dear Mr. Partlow:
My position as Cnemical Engineer with the Tennessee Valley Authority (TVA) in Chattanooga was eliminated effective September 30, 1988. In my letter of October 14, 1988, I listed several technical concerns I expressed while at TVA. This letter is to request that you pursue the completion of an engineering assignment I had at TVA concerning corrosion inhibitors for closed water systems. Enclosed is'a copy of a draft engineering report recommending corrosion inhibitors for closed water systems submitted to Mr. J. L. Bates, Manager of Chemistry and Nonradiological Environmental Protection. I did not include this information in my letter of October 14; 1988, because I believed that my recommendations were being considered. I now believe, however, that my draft report is being ignored. I Past f ailures to evaluate the use of corrosion inhibitors have created potentially serious safety hazards at TVA nuclear plants. Because of inconsistent use of corrosion inhibitors in the component cooling water at Sequoyah Nuclear Plant, the component cooling system heat exchangers have experienced numerous tube failures. The frequent tube plugging increased the pressure drop on the component cooling water side of the heat exchangers. It is my understanding that the pressure of the component cooling water was increased to greater than the pressure of the river water flowing in the shell side of the heat exchangers. If another heat exchanger tube rupturcs potentially radioactive component cooling water can flow to the I.ver. i Another safety problem is related to the corrosion inhibitor used in the diesel generator jacket water at Bellefonte Nuclear Plant. Enclosed is a TVA memorandum describing the potential problem. The diesel generator supplier states that the corrosion inhibitor is not acceptable. In addition, there are several water systems on critical air conditioning systems and heating systems at Sequoyah and Browns Ferry Nuclear Plants that are not being treated. Corrosion induced failure of any of these systems can be a serious safety problems. One example is loss of air conditioning to the control room at Sequoyah. P
gy 3. . . .$ t' . if. ; ' 1 {
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- t. <c a-hp s f dis 71etterJis,;not.to say that=my recommendations
,' ;are.best..;What I'am saying is that'TVA needs~a consistent '
technical basiseforfthe use'of corrosion inhibitors; .The present' program' appears to be"a'. hodgepodge,of.different recommendations. I If you neediadditional'information I can be contacted-at- 615 267-6181.
, Sincerely, Q .
S. .
'. ) ' Eugene'D. Buggs-V l Attachment 1 - Draft report " Corrosion Control for Closed Water Systems 4 Attachment'2 -'TVA Memorandum concerning corrosion inhibitor
, , forJdiesel generator jacket cooling vater at Bellefonte Nuclear Plant a _ _-_ _
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J ($ ). . ~ REDRAFT EDB:SLK 9/2/88 04881' INVESTIGATION REPORT Corrosion Control'for Closed' Water' Systems 1.0 EXECUTIVE
SUMMARY
L. An investigation of the chemical corrosion control for closed water-0 2 ...
- systems was requested for Browns Ferry Nuclear (BFN). and Sequoyah Nuclear Plants (SQN). The chemistry program administrative instructions at' both
. plants were reviewed: to determine the present practice. Also, applicable sections-of the Final Safety Analysis Report (FSAR) for each plant and reference process flow diagrams were reviewed to indentify any systems not presently being treated. A list lof the systems identified'and the corrosion inhibitors being used is shown on Table 1 for BFN and Table 2 for SQN.
1 A sodium molybdate - sodium nitrite - tolyltriazole combination [ if
. recommended for most closed, recirculating water systems. Ammonium hydroxide-hydrazine.is recommended for auxiliary steam systems.and for water systens connected to the auxiliary steam systems. proprietary glycol formulations are recommended for glycol systems. No treatment is 1
recommended for the evaporative coolers at BFN. A list of the recommended corrosion inhibitors for each system is shown on table 3 for BFN and table 4 for SQN. i Recommendations for the control of microbiologically induced corrosion (MIC) are not furnished because a separate program is being developed. I C__.___.___
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The MIC program be compatible with the corrosion inhibitors recomended -in' this report. 5 R-2.0'. DISCUSSION ~
- 1 Each' system was evaluated'to determine.the most effective corrosion inhibitor.
2.1 Auxiliary Boiler at BFN and SON
'A' previous investigation concluded that t'he present all volatile treatment using. ammonium hydroxide-hydrazine should be et,.ttinued for BFN (reference 1). sther investigators have also. recommended using-ammonium' hydroxide-hydrazine for boiler systems (reference 2).
Ammonium hydroxide is added to maintain the pH between 8.8-9.3 and a residual hydrazine concentration of three' times the dissolved oxygen concentration is maintained (reference 2). 5
. 2.2 Closed Building Heating at BFN 1
-In this system auxiliary steam is used to hest the recirculating water stream. A leak in the steam heat exchanger could allow mixing. i of the auxiliary steam and the recirculating water. The corrosion inhibitors in both systems must be compatible. Since ammonium hydroxide-hydrazine is recommended for the auxiliary boiler, this K6C combinationshouldbeusedinthewatersystem/.
h For a closed,
, .s. l4 9 ~3-recirculating. water systemz a hydrazine concentration between 20 to 70 mg/ liter would maintain acceptable ' corrosion rates (reference' ). A pt: range of 8.8-9.3 provides effective protection L .for: mixed alloy closed' water systems (reference 2). 2.3 Turbine Buildinz' art 4 Auxiliary Building Heating at SON L. This system is similar to.the closed building heating system'at BFN. Ammonium hydroxide-hydrazine'should be used for corrosion protection as.above. 2.4 Offras, Glycol Chillers at'BFN i-
. Chilled ethylene glycol is used to' condense water in the offgas g 1 system. The' ethylene glycol is purchased containing a proprietary M
corrosion inhibitor. ' Periodic testing to verify that the ethylene glycol meets the purchase specificatic,ns is required. y 2.5 Ice condenser chillers at SON t! Ethylene glycol is used to maintain the ice in the ice condenser. which is part of the containment heat removal system. Ethylene glycol is furnished with a proprietary corrosion inhibitor as t previously discussed. l t i Jb.-_ ---_ - _ _ - - - _ - _ _- i
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u e ,-o at 4 Sa t L: 2$6I Evaporative Coolers at'BFN: N u , , .v 1 1 Water is sprayed into the turbine building ventilation system to Ib. "U provide evaporative'~ cooling of the air. Pumps recirculate the water' h?C -.that does not evaporate. A nonvolatile corrosion, inhibitor' pust be . p O used in this ~ype t of system'to prevent' chemical contamination of the A-turbine building. . Usually seme-typ s' scale controlling agent and Mk ' aSc . algicide LeAused. . But misapplication of these chemicals can create ~ t-chemical contamination of the turbine building, periodic cleaning e is preferred instead iof using'a corrosion inhibitor, p l 2.7- Other Systems p A' previous investigation concluded that, based on the data presently available . sodium molybdate - sodium nitrite.- tolyltriazole is the i
.mostLeffective nonchromate corrosion inhibitor combination for closed, recirculating water systems (esference 4, copy attached).
That report withheld the recommendation for using sodium altrite ' until further. investigation because of possible environmental problems. A subsequent report by another investigator states that
- y. nitrite is teing used successfully at nuclear plants (reference 3).
Acombinationof150mg/litermolybdate(Mo0})and
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350 mg/ liter nitrite (NO ) at a pH of 9 produced the lowest f corrosion rate for SAE 1010 steel (reference 4). Tolykriazole has proven effective at between 10-20 mg/ liter (reference 5). v i a._.x---l1
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' ;3.1 Use ammonium hydroxide and hydrazine in. the auxiliary boilers
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at BFN 9nd: SQN. , 3 (-{~; - /(:. ' ' 5' ( yv -
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i f 3.2. . Uce anunonium hydroxide. and hydrazine in the closed. building
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. heating system at-BFN.
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, _ 3.3 Use ammonium hydroxide-hydrazine in the turbine buildng,and g '
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, 3. auxiliary-buildng heating at SQN.
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- 3. 4 L- Change the. pH requirement for the. auxiliary boilers at SQN and a r 4
F.1. a < BFN to 8.8-9.3. o.
.c .3.5 Change:thebydrazine'concentrationfortheauxiliaryboilerat n-BFN to greater than'or equal to three times the dissolved c'
. oxygen concentration.
.p b 3.6' ~ Change the pH requirement for the closed building' heating at
(.. BFN to 8.8-9.3 and change the i y6razine concentration to I 20-70 mg/ liters. !
.i 1
i 3.7. Change the pH requirement for the turbine building and
, .a auxiliary building heating at SQN to 8.8-9.3, and change the
[ hydrazine concentration to 20-70 mg/ liter.
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3.8i Periodically clean the evaporative. coolers at BFN, but'do not - a: th .use a corrosion inhibitor ~in the coolers, i $;f l 24 gg ' " 0 3.9 ' Establish a program to Bradually implement the use of sodium
'%g sgj ~n itrite - sodium molybdate - tolyitriazole in the systems as.
f-
~ listed on Table 3 for BFN and Table 4 for SQN. -Recommended f '
concentration is 150-200m6/literMo0{,300-400'mg/ liter
~
NO and 10-20 mg/ liter tolyltriazole , at a pH range of 0.8-9.3.
)
.4.0: References
..x. a s
- 1. Davis,.J. J., " Investigation Report - Chemical Treatment ~
Alternatives for the. Auxiliary Boiler System - Browns Ferry. Nuclear' Plant,"' attachment to TVA memorandum dated November 20, u 1986 (L29 861119 857).
- 2. Private communication with Jeffrey J. Kisty and' Joe Roti, Drew
. Industrial Division, Ashland Chemical Co., Boonton, New Jersey, j
~ December, 1986.
- 3. Brobst, G. E., " Chromate Substitutes for Ccerosion Inhibitors in i, Cooling' Systems," Electric Power Research Institute, NP-5569, 3
Decembor, 1987. 2 1 l 1 i p de
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#' 4. Buggs.,E. D. :" Investigation Report -' Corrosion-Inhibitors for!
m[f r f6; y , o 5- q; '.the Component Cooling System'- Sequoyah'.Nuclea'r Plant,"
- p. ..
, r dN Y
, attachme'nt to TVA memorandum dated June 1, 1987 (L29 870501 890).
N { Nf he y., h, <
.5.f Vanderpool, D.,.Storys,.S., Ro'ther, H-J " Comparative 7
", , Investigation into Corrosion' Inhibitors for Copper," presented L
Q . atI47'th' Annual Meeting International Water Conference, n' e ,. Pittsburgh, Pennsylvania, October 27-29, 1986, p N . 1' 5.0' Appendix-L 4 5.1- Table 1 -' Closed Water Systems at Browns Ferry Nuclear Plant. F ; h -5.2~ Table 2~- Closed Water Systems.at'Sequoyah Nuclear Plant.
. 5.3 ' Table 3 - Recommended Treatment.for Closed Water Systems at--
' Browns Ferry Nuclear Plant, u.
;5.4 Table 4 = Recommended Treatment for Closed Water Systems at a-
> t- ciz . Sequoyah Nuclear Plant. <y b 5 '. 5 Copy of. Report - Buggs, E. D.. " Investigation Report - Corrosion Inhibitors for the Component Cooling System - E Sequoyah Nuclear Plant," attachment to TVA memorandum dated )
; June 1, 1987 (L29 870501 890). ;
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F
- .: ONR$ CORDS:
tint, P1mit Ew.ser. Soc.uop.h haelvtr Plant
- L . ;bblers.-
. C3 :' .. son', Project Engineer, SQIP, Der 3 DSC-E Sequoyah '
aar= -: JUN l1987 870604S0053 f,j
SUBJECT:
INVESTIGATION REPot? - CORROSION IDHIBITORS FOR IME'C00tPOWENT COOLING SYSTEM < SEQUOYAM NUCLEAR PIANT (SQE) The attached report details our evaluation of corrosion inhibitors R
.p .for the component cooling system. As discussed in the report, sodium molybdate-tolyltrimsele is recommended as the corrosion inhibitor. Laboratory testing is reched,' however, to develop comparative data for the inhibitor combinations used by most domestic Plat plants. This testing any be funded through the Division of Energy Demonstrations ~ sad Technology. If these funds are not available, we rect == mad that SQE fund this testing.
The Chemical Support Section will be available, at your request, to assist.in implementing these recommendations. I w-K W. Wilson JMI:GJP:EDB:JARF Attachment ec-(Attachment): RIMS, MR of 72A-C J. L. Bates DER, Sequoyah-J. J. Davis, BR 55 159I-C J. A. Kirkebo..W12 A12 C-K C. 5. Lester. ONP, Bellefonte D. R. Matthews, OEP, Watts Bar J. M. Miller, LP SS 150D-C (2) N. E. Scott, BR SS 135I-C 3 R. A. Sessoas, W12 A6 C-K l W. L. Williams ONP, Sequoyah E. D. Buggs, BR 55 16014 2026U Reviewer's Inittst/ Data C. D. Buggs fD8 /3-Mf/ -
&b ,/3h E. E. Scott C. 3. Pitz1 f'}1/'t g/c,q/j t j
- J. H. Miller M N h/ M R. A. Censome G{hH //li/Alf)
(K L _ _ _ _ _ _ - - - - -
[ ( ' e 4 INVESTIGATION REPORT CORROSION INKIBITORS , FOR THE COMPONENT COOLING SYSTEM
.SEQUGYAH NUCLEAR PLANT p
Prepared by OM Date Il-17-bl Submitted by / . Date 8 *8 ~87 - t6 cj ' . . . 9 _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ . _ _ _ _ _ _ _ _ _ _ _ _ . _ _ _ _ _ _ _____._______m. _ _ _ _ _ . . _ _ _ . - _ _ _ . _ . . . _ _ _ . _ _ _ _ . _ _ _ _ _ _ _ _ _ _ _ _ . _ . _
7 ' x< . . . 1.0 EXSCUTIVE SUM?tARY-Corrosion' inhibitors for the compc ent con ig system (CCS) were ~
.h evaluated at the request of the Chemistry coup Supervisor at Sequoyah Nuclear Plant (SQW). The investigation included screening the inhibi-tors presently used by.most domestic pressurized water reactors (PWR) and searching the literature for possible alternates. Six of the more
- common inhibitor combinations were evaluated. .
Based on the results of this evaluation, the hydrazine-ammonium hydroxide used 6t SQN does not provide the best overall corrosion inhibition. From literature references, a sodium molybdate-nitrite-tolyltriazole combination appears to be the most effective nonchromate corrosion inhibitor; however, using nitrite could create m environ-mental discharge problem and needs further research. Me.mwhile, the sodium molybdate-tolyltriazole combination that was used in the past should be used again. The large leaks of essential raw cooling water (ERCW) and reactor coolant into the CCS that Chemistry Group personnel at SQN reported as causing the previous difficulty in maintaining'the - recommended inhibitor concentrations are being repaired. Since this recommendation is based only on literature research and private communications laboratory screening tests should be performed to develop comparative data. The tests should include the effects of a radiation field on the corrosion inhibitor. Finally, corrosion coupons and/or instantaneous corrosion monitors should be installed in the CCS so that the effectiveness of the corrosion inhibitor can be evaluated and documented. 2.0 SYSTEM DESCRIPTION
' The CCS is a closed, recirculating cooling water system which provides
- ooling to potentially radioactive systems and provides an intermediate cooling loop to prevent releases of-contaminated material-into the environment. Cooling of the CCS, a safety-related system, is provided by ERCW. Demit.oralized water is used as makeup for the CCS.
The following ;tst of materials is representative of those utilized in the CCS (reforence 1):
- 1. Carbon Steel (Grade 1020) .
- 2. 90/10 Cu-Ni
- 3. 410 Stainless Steel
/. . 316 Stainless Steel
- 5. Admiralty Brass 3.0 BACKCROUND Westinghouse Electric corporation the nuclear steam system vendor, *
- recommends using potassium cLeomate for corrosion protection in the CCS.
Because of environmental restrictions on the discharge of chromate, it was . decided that this inhibitor will not be used. As an alternate, sodium molybdate-tolyltriazole was used. This treatment was discontinued 2026"
E,9 ~ lW%l .. l J .' G *T ;
.; O
~ '
~ because.ot'th's difficulty in maintaining' the recomunended concentration d resulting in high chemical makeup. cost.- Several of'the possible causes. u 1 were the consumption of molybdate in'forising a passive film (reference 2), '
.large leaks from the ERCW or reactor coolant system into the CCS, or 7
; draining the CCS for maintenance.
. Hydrazine-asumonium hydroxide was believed:to be a less costly sut. ttute. -
Hydrazine has been affectively used by many industries 'as an oxyr
.A '
scavenger"and for passivation. of avtal, surfaces. periodic analysis, however, has shown that-the dissolved oxygen (DO) concentration in'the
~
CCS varied between 0.1 ppa to 10.0 ppa (data listed'in Appendix.9.1).. c As reported by Chemistry Group personnel at SQN, the recommended hydrazine concentration could not be maintained because of large leaks of ' ERCW and reactor coolant into the.CCS. The leaks are being investigated and* repaired. . 4.0 UTILITY SURVEY Several utilities were contacted to deter 1aine the corrosion' inhibitor. they are using. The results of this survey are listed in Appendix 9.2. Listed below is a summary of the inhibitors used:
'1. potassium Chromate 2.- Sodium Nitrite-Borax-Organic topper Inhibitor (usually Benzotriazole or Tolyltriazo. 0
- 3. Hydrazine-Anunonium Hydroxide
- 4. . Hydrazine-Morpho 11ne j '5. .Sodlum Molybdate-To1yltriazole sach of' these inhibitors was evaluate ,e its potential use at SQN.
Also, a sodium molybdate-nitrite-tolf. Azole combination, even though not' presently being used, was evalua .. 5.0 DISCUSSION 5 .1- potassium Chromate Although this inhibitor offers excellent overall corrosion !
-protection, it cannot be used at SQN because'of an environmental l
. limitation on' tho' discharge of chromates. -
5.2 Sodium Nitrite-Borax-o: r.anic Inhibitor . . I
. The chemical mechanisms volved in corrosion inhibition are complicated; but, ' in ge- ' . the inhibitor buffers the cooling
. water pH-to approximate e.0 reduci i the amount of hydrogen ions present to promott arr>sion, and nitrite reacts with oxygen reducing.the amount of ava n available to react with iron in the 1 system. The organic - . tor (usually benzots azole or
- tolyltriazole) funct. sy reacting with copper oxide on the surface of copper or er alloys forming a s:.rong insoluble t'.ymeric complex (r nce 4). It has been reported that sodium ,
nitrite-borax-organic .tibitor offers excellent protection to iron, et-ci, copper alloys, aminum, and brass (reference 5). 2026U
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Two potential problems with sodium nitrite are microbial growth and environmental effects. First, microbial growth has been reported : in some plants using' sodium nitrite (reference 3). Both Calgon ' Corporation and Malco Cheatical Company were contacted to determine
, how this problem can be handled (references 6 and 7). Both cont anies of fer microbial detection services and effective Scides
- to re&Jee_any'blological. activity discovered. On the othe hand, the potential disposal problem has'not been resolved. Dur ; the h
utility ' survey, several plant personnel; reported that the problem is ' believed to be related to the conversion of nitrite to nitric acid. The acid then promotes corrosion in radwaste treatment and affects the performance of the radwaste demineralizers. Also, nitric acid 1
. Poses a disposal problem in solid and liquid wastes (references 8 and 9). In spite of these two pn**ntial problems, sodium nitrite-borax-organic inhibitor is being ssed in a large number of plants (Appendix 9.2. Table 1).
5.3 Hydrazine-Assumium Hydroxide i In addition to being an excellent crygen scavenger, hydrazine also passivates iron and copper surfaces. Metal rurfaces are chemically reduced from higher to lower oxidation states (reference 10). Ammonium hydroxide is usually a*ted to maintain a pH of 8.0 - 9.5, but in some plants it is not ai!'ad because under certain conditions f.; - hydrazine will form ammonium hyoroxide. An evaluation of alternative inhibitors performed for TVA by Combustion Engineering (reference 1) concluded for hydrazine-ammonium . hydroxide that, "With * .xception of admiralty brass and 304 S.S., this inhit . system. appeared to increase the instantaneous corrosion ra - the test materia.ls." Other inhibitors tested were: (1) ; assium chromate. (2) sodium molybdate-tolyltriazole,'and (3) aquadene (a proprietary inhibitor package). Furthermore, hydrazine is most ef fective at boiler temperatures (Q$ 500*F). At the lower temperatures of the CCS ( cs 100-200*F) catalyzed hydrazine is needed (reference 11). Catalyzed hydrazine, however, has impurities that may exceed the water chemistry specificati ns in the CCS (halides and soluble metals). ~ 5.4 Hyd razine-Morpholine
- Morpholine is classif is a neutralizing-type a:Inc. It reacts
, with the acid in solut to form neutral amine salts, thus raising the pH (reference 10) Although nc comparative data are available, it is believed that h- rezine-morpholine will offer about the same corrosion protection
- e hydrazine-ammoni':- hydroxide system.
The advantage in ur rpholine in the CC instead of ammonium hydroxide is a redu otential for attack 4 copper alloys
' references 10 and .,;
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- 5.5 Sodium Molybdate-Tolyltriarole
~
~~..
One author describes the mechanism of sodium molybdate (Na2Mo0 4) protection as follows:
"When iron corrodes, molybdate anions, in competition with her anions, adsorb to form a nonprotective complex with iron t .4).
Due to dissolved oxygen, the iron (II) is oxidized to the II) state, and the iron (II)-molybdate complex transforms to iron (III) molybdate which is both insoluble and protective in neutral and basic waters. This protective film may be more complex than simple iron (III) molybdate in that it probably also contains iron (III) oxides. The eventual accumulation of a double layer increases the protection afforded by the film." (reference 12) The Combustion Engineering report (reference 1) states, "Na2M oO 4 /tolyltriazole provided the best overall corrosion inhibition of the alternative (nonchromate) inhibitors tested." Another investigator has shown that sodium molybdate is an ef fective corrosi,n inhibitor in simulated and actual cooling water systems (ref. ce 12). Also, tolyltriazole offers good protection for copp. and copper alloys (reference 13).
~
5.6 Sodium Molybdate-Nitrite-Tolyl * ~iarole The molybdate-nitrite combination was tested by a research group because of the concern that molybdate alone is not effective in deserated and low oxygen water traference 14). The referenced report shows that a combination 150 mg/ liter Mo0;2
.(molybdate) and 350 mg/ liter f; -nitrite) . produced the lowest corrosion rate for SAE 1010 st A .n low oxygen water (1 mg/ liter) as compared to using only E0} .c Mooi2 . Another researcher showed that sodium molybdate-nitrite could produce very low corrosion rates in mild and stainless steels (reference 12).
6.0 ADDITIONAL WORK Since none of the listed references includes an evaluation of all the corrosion inhibitors under the same conditions, a laboratory testing , program would provide ecmp,-ative data that could be used to determine the most economical corros . .n inhibitor. 1' scope of the testing pt ram has not been defined and no cost l e timates are available; he ar, previous corrosion inhibitor tests and psuposals have been estimat t between $50,000 to $250,000. Because the comparative data could of industrjwide benefit. funding through the Division of Energy Der .str2tions and Technology would be appropriate.
~
To document the effectiv. of the inhibitor chosen, corrosion coupons and/or instantaneous cor- .n monitors are usual: installed in closed cooli w water systera (r mces 5 and 6).
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- 2026U
4 T, . .. , - . . . - - . 7.0- CHEMICAL ADDITTON SYSTEM ' .
~~
The chemical addition system for the CCS was examined. Now the corrosion inhibitor is added to the casing of the CCS pump. This process does not appear to be the most efficient or safest way to add chemicals into the system. Chemical spills can occur when trying to add chemicals o the
- pump casing. -
8.0 CONCLUSION
S
- 1. Of the nonchromate inhibitors, sodium molybdate nitrite-tolyltriazole appears to provide the best overall corrosion protection.
*. Sodium molybdate-tolyltriazole is.a more effective corrosion inhibitor than hydrazine-ammontur. hydroxide.
9.0 RECOMMENDATIONS
- 1. Sodium molybdate-tolyltriazole should be used in the CCS.
- 2. The potential environmental effects of using nitrite should be evaluated. ,
- 3. Laboratory tests should be developed to determine the effectiveness of the inhibitors discussed, excluding chremste. Tests should include effects of radiation field.
4 After completing the corrosion tr , an economic study should be performed to determine the cost e-mil of. corrosion protection. The most cost effective inhibit a- sn then be chosen.
- 5. Corrosion coupons and/or instantaneous corresion monitors should be installed in the CCS to document the effectiveness of the corrosion inhibitor.
- 6. A permanent chemical feed system should be installed so that the chemicals can be added safely and easily.
10.0 REFERENCES
't. Fink, C. C. , Rentler, R' N., "Electrocher cal Evaluation of 8
- Alternative Inhibitorc ir Use In Component Cooling Water Systems,"
Draft Report, Combusti'. 7ngineering, Inc., Windsor, Connecticut, April 1983.
- 2. 'Whitt, P. L., "Investi).4 Live Report-Sequoyah Nuclear Plant Component Cooling System Water (1e*: .try," attachment te TVA memorandum dated April 27, 1984 (L29 9 ?/ 909).
- 3. Davis, J. J., "Invec* tion Report - Chemical Control Practices In t his Reactor Building Jed Cooling Water System," attachment to TVA -
m..morandum dated Janu / 6, 1986 (L29 860105 808).
'*h 20260 '
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. _ _ . . _ _ _ _ _ - . _ _ _ _ - - - - - - - - - - - - - - - - - - - ~ - - - - - - - - - - - - - ' - - - - - - - - - -
; . 3, . 9 '
- 4,; Technical Bulletin, cobratee TT-50-S, PMC Specialties Group, Inc., .
Cincinnati ' Ohio. sp; l
- 5. Data Sheet No.10-178 . "NCS Corrosion Inhibitor " calgon Corporation, .
1 Pittsburgh.. Pennsylvania.
- 6. Private Communication ~ with David M. Shelby, Calgon Corporat ten.
Chattanooga..TM, December 10, 1986.
- 7. Private Communication -ith Gary J. Peterson, Nalco Chemical . company,
' Atlanta. Ceorgia, December 10, 1986, l
8.: Private Communication with Randy Booth, Louisiana Power and Light Company, Waterford-3. Taft, Louisiana, December 1986. 9s . Private .Consnunication with ' Jill F.[rrell,' Commonwealth Edison, Maywood. Illinois December 1986.
- 10. Pelosi..P.'F.. Cappablanca, C.' J., " Corrosion Control in Steam and Condensate Lines,". Chemical Engineering, Jur.e 24, 1985, pages 61-63.
- 11. Private Communication with Jeffrey J. Kisty and Joe Roti, Drew Industrial . Division ' Ashland Che:,tcal Co. , Boonton, New Jersey, December.1986.
- 12. Robitaille, D. R., " Sodium Molybdate As A corrosion Inhibitor In Aqueous Environments," presented at the Water Corecsion Seminar.
Chicago Illinois, October 18-20, 1977.
- 13. Vanderpool, D.', Storp, S. , Roth' 41--J, " Comparative Investigation into Corrosion Inhibitors for Cor- r," presented at 47th Annual Meeting International Water Cons crence, Pittsburgh, Pennsylvania.
l October'27-29, 1986. 14 Weber, T. R., Stranick, M. A., and Vukasovich, M. S., " Molybdate L Corrosion Inhibition In Deaerated and Low Oxygen Waters," presented at Corrosion /'85, National Association of Corrosion Engineers. Boston,~ Massachusetts, March 25-29, 1985. L 15. Private Communication with D. R. Robitaille, Amax Specialty * { l- Chemicals, Ann Arbor, N.chigan, October 1986. I l- . 16 Private Communication , h Gilbert K. Meloy, PMC Specialties Group.
- Inc., Cincinnati, Ohio. sve 6er i, 1986.
8 . _. .. s. v . l i l
'2026U L___________--- _ _ _ _ -
APPENDIX 9.1 COMPONDrg COOT.ING SYSTDI DATA '
,8, Page 1 of 6 -
~-.
Ammonia Hydrazine Dissolved Oxyten s Da t e ,,, -g pH ppe ppe ppe 9/10/85' A 8.62' 4.0 0.106 2.0 - B 8.72 5.0 2.67 0... C 8.67 3.4 0.2 0.- 9/18/85 A - 5.70 - 4.0 B - 5.30 - 2.0 C - 5.40 - 3.0 10/15/S,5 A 8.35 0.69 <0.005 1.0 B 8.51 0.60 . <0.005 1.0 C 8.61 0.69. <0.005 0.8 10/29/85 A 8.5 - 0.016 - B 8.47' - 0.017 - C 8.51 - 0.044 -- 11/5/85 A 8.43 - 0.01 - B 8.56 - 0.015 - C 8.57 - 0.01 - 11/8/85 A - - 0.007 - B. - - 87.5 - C - - 12.8 - 11/12/85 A 8.45 - . 6.4 - B 8.59 - - 5.34 - C 8.57 - 6.4 - 11/26/85 A 8.07 1.3 <0.005 - B 8.15 1.8 <0.005 - C 8.11 0.834 <0.005 - 12/3/85 A 8.9 1.64 <0.005 - B 8.9 1.76 <0.005 - C 8.93 1.64 <0.005 - .. B - - 3.0 - .
~
C - - 4.0 - 12/10/c5 B B.77 <0.005 -
. C 8.74 s.2 <0.005 -
12/11/85 B - 2.14 - C - 9.61 - 12/17/85 B 8.62 - 3.2 - C 8.50 - 4.3 - 20260
. \
i
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APPENDIX 9.1 ll ,4 . l. COMPOKENT COOLING SYSTDI DATA Page 2 of 6 3.- .
' A' '
Ammonia Hydrazine pj,; solved Oxygen Date l g pH ppe ope ope 12/24/85. A' 8.05 1.03 0.4 10.C
- e B 8.04' 1.03 1.0 6.J.' j C 8.10' 1.03 , 1.0 6.
12/31/85 A 8.46 - -
. 4.5
.B 8.63 - -
4.0 C 7.76 - -- 5.0 1/14/85 B 8.48. 14.0 . <0.005 2.0 C 8.14 8.0 <0.005 3.0 B. 8.45- 15.17 - - C 8.04 8.2 - - B 8.42 14.8 - - C.. 8.04 8.1 - - 1/15/86 8 8.53 12.5 - - C 7.93 7.96 - - A 8.28 7.0 - - B 8.34 11.5 - - C 7.96 13.5 - - 1/16/86 A 8.01 8.4 - - B 8.35- 14.8 - - C 7.96 9.6 - -
'1/17/86 A 8.15 17.5 - -
B 8.15 19.0 - - C 8.45 13.5 - - 1/21/86 A' - 7.7 <0.005 -
- j. B - 11.1 <0.005 -
C - 4.3 <0.005 - 1/28/86 A 7.99 .89 <5.0 1.5 B ,8.13 4 <5.0 3.0 C 8.12 <5.0 3.0 2/4/86 A 8.14 i5 <5.0 2.0 B 8.05 8 <5.0 5.0 C 7.72 5 < 5 '. 0 5.0 2/11/86 A 8.05 1.75 <0.005 4.0 B 8.14 4.0 <0.005 6.0 . C 7.61 5.2 <0.005 6.0 2026U . . __ _m
r p , APPENDIZ 9.1 1 :.., . COMPONENT COOLING SYSTEM DATA
.. .--,c. . . . . . . - -.. Page 3 of 6 Ammonia Hydrazine Dissolved Oxygen Date !g pH ppm ppm ope ^
2/18/86 A 7.64 5.4- <0.005 -
- l. B 7.78 4.3 <0.005 .
l C 7.67 5.3 <0.005 - l
'2/25/86. A 7.48 - <0.005 ,
8.0 B 7.62 - <0.005 10.0 C 7.41 - <0.005 10.0 3/4/86
- A 7.78 - 0.018 3.0 B 7.84 -
. 0.016 0.4 C 7.88 - 0.020 0.3 3/11/86 A 7.75 13.0 <0.005 3.0 B 7.76 13.0 <0.00$ 3.0 C- 7.74 13.0 <0.013 5.0 3/25/86 A 7.63 5.0 <0.005 3.0
( B 7.6 4.1 <0.005 5.0 1 C 7.37 5.7 <0.005 3.0 4/1/86 A 7.43 3.0 0.005 - B 7.43 5.0 0.006 - C 7.19 5.0 0.005 - 4/8/86 A' 7.41 3.12 . <0.005 B 7.55 4.32 -
<0.005' C 7.55 5.20 <0.005 A - - - 4.0 B - - - 5.0 C - - - 5.0 4/15/86 A 7.26 4.1 <5 1.5 B 7.37 5.0 <5 0.2 C 7.38 3.9 <5 0.2 4/29/86 A 7.67 1.28 <0.005 4.0 -
B 7.64 .46 <0.005 5.0
- C 7.65 36 <0.005 5.0
'4 5/13/86 A 7.60 - <0.005 -
B 7.58 -
<0.005 -
C 7.40 <0.005 -
~
5/14/86 A - - - 0.1 B - - - 0.2 C - - - 0.15 . 2026U .
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- APPENDIX 9.1' t' l';;yj,j.; :COMPOWENT C001.IEC. SYSTEM DATA
, . e '. c-p g 4 of 6
' fi -
^.
A .
- Anunonis ' Nydrazine Dissolved oxygen Date . M; pH ppm 'opm ppm
- 5/20/86- A' 7.32 840' <0.005
- =*
f n, - , B- '7.25 775- <0.005 - .
.C. 7.38' 890 0.018 -
- 5/27/86 ~ A- - 7. 6 7' ~0.34 -
l B .- 7.64 0.4 - -
;;f C- 7.78 0.38 -- - % 'N . .
A -- - - 7.0
.B - -
- 5.0
, C- -- - - 7.0-
'6/3/86 A ~7.65 - '<0.005 0.1-i? B 7.24L -- '0.005
< .0.1
.C ,7.28 -.
<0.005 0.1-c 6/10/86 4 A 7.09 0.26 ' <0.005- '5.0 6.91 0.13 <0.005 5.0 B
C 6.91 0.08 <0.005 5.0 6/15/86 A -- c- 26.7 0.1 0.35.
-B -- - 32.0
-C - - 9.6 0.5 6/17/86: A- -8.51 - . 18.16 0.3
-B 8.61 - -
23.50 0.4 C 7.49 - 6.41- 0.25 6/23/86 A 8.3 .- 6.35 -
,B' 8.03 -
7.05 - IC' 7.67 ' - 16.77 - 6/27/86 A - 2.0 - 1.0
-B - 1.6 - 0.2 C -
2.6 - 1.0 7/1/86 A 8.03 0.7 <0.005 5.0 . B .. 7.89 ' 05
. <0.005 4.0 C 7.98 .7 <0.005 2.0
'5 -
7/8/86' A 7.. ? s.5 <0.005 5.0 B 7.99 J6 < 0. 0'J 5 5.0 C 7.92 e <0.035 2.0 7/22/86 A 7.69 e.88 <0.01 .- B 7.72 0.92 <0.01 - C 7.68 ).78 <0.01 - 1-t, 2026U . S 2
..Em______m.___m_______
4i,' , Appg;pII g,1 , I
'COMPONgNT C00LICC SYSTEM DATA-
- g. ~ , 4 . - .f . '. . .-. .;.. .... . .. pase 5 of 6-
)
. L ,
, Amnonia Hydrazine Dissolved Oxygen ')
A Date !LI. . pH' ops ope ~ ops I 1 7/29/86- A: O.73 -]
- 7. 8 2 .' - -
B- 7.70' O.73 - - . n C '7.67 0.73 - - i
~8/19/86' A :7.81 0.695 <0.005' .
6.0 B 7.03 0.640 <0.005 7 .' C C 7.70 0.660 <0.005 6.0' 1 d 8' 8/26/86; A 6.51 0.580- <0.005- - B- 7.17 0.620 . <0.005- - : C 7.23 0.580 .<0.005 .- 1
'8/27/86 A- .- -
10.7 - B - - 4.27 - l C - - .4.27. - .. s 9/2/86. A~ 8.04 0.900 <0.005 2.0- l B 7.90 0.900
<0.005 '3.0 I C- J.77 1.033 <0.005 3.0. I 9/9/86, -A- 7.54 - <0.005 2.0 .i "B- 7.56 - <0.005 1.0 .j C 7.54 -
<0.005 1.0 i
$/16/86 A- 8.05 1.0 - <0.005 3.0 -
B '7.36 1.0 -
<0.005 2.0 ,
C -7.55 1.0 <0.005 2.0 i 9/23/86 A 7.52 -
<0.005 -
-B '7.74' -
<0.005 -
C 7.53 -
<0.005 -
9/30/86 'A 8.24, 1.28 <0.005 - B 7.94 2.16 <0.005 - C 7.81 2.12 <0.005 - A - - - 5.0 . B - - - 5.5 { C - - 5.0
+
10/7/86 A 8.64 - - 8.0 B 7.49 - 8.0 C 7.36 - 8.0
~
10/9/86 A - - - 5.0 B - - - 6.0 C - - - 6.0 . 2026U . F e \, . .. .
APPENDIX 9.1
, ,, , C0tfPOWENT C00LINC SYSTDI DATA
. ~ . - - -L . .. - ~ . . . Page 6 of 6
,\
Asanonia Hydrazine Dissolved Oryten
'Dete N,_I . pH ppe pps ope
. 10/9/86 A - - 16.0 0. 1-(cont'd) B .- - 11.7 0.c40 C - - 41.5 0.. )
10/14/86 A 7.84 - 0.006 , 0.8 8 8.00 - 0.005 0.8 C 8.01 - 0.010 0.2 10/21/e6 ~ A 8.26 - - 3.0 B 8.21 -
- 3.0 C 8.21 - - 2.0 10/28/86 A 7.95 1.75 <0.005 8.0 8 8.02 1.65 <0.005 4.0 C 7.85 1.40 <0.005 6.0 11/4/86 A 7.47 1.9 <0.005 5.0 B 7.38 1.95 *
<0.005 4.0 C 7.25 1.9 <0.005 C.0 11/11/86 A 6.73 - <0.01 7.0 B 6.93 - <0.01 6.0 C 6.90 -
<0.01 5.0 11/18/86 A 7.10 2.35 . - 6.0 B 7.20 2.30 - - 6.0 C 7.22 2.30 - 6.0 A - - <0.005 -
B - - <0.005 - C - -
<0.005 -
.. 11/25/86 A 7.07 1.9 <0.005 5.0
$ 7.06 1.85 <0.005 5.0
- l C 7.04 1.9 <0.005 5.0 l <
l 11/26/86 A - - 32.04 - - B - - 13.9 -
- C - -
17.1 -
. 12/2/86 A 7.27 .- 0.011 1.0 , ,
B 7.20 J . 0.007 1.0 C 7.37 ' O.007 1.0 - O e S 2026U . f -~
- .b
. - APPENDIX 9.2
, ,, , TABLE 1 CORROSION INHIBITORS USED BY SOME UTILITIES
- Page 1 of 3 ,
Component Cooling Reactor System Corrosion Utility supplier Inhibitor Alabama Power Co. o Joseph M. Parley 1 and 2 W Chromate
. Arizona Pub!ic Service o Palo Verde ?. 2, ar.d 3 C-E Nitrite and Proprietary Copper Inhibitor (Walco)
Arkansls Power and Light , o Nuclear One 1:W Sodium Witrite-Borar Baltimore Cas and Electric Co. o Calvert Cliffs 1 and 2 C-E Hydrazine Carolina Power and Light o Shearon Harris W Chromate
~
Commonwealth Edison Co. o Zion 1 and 2 W Chromate o Byron 1 and 2 W Nitrite-OH Buffer Tolyltriazole (Calgon) o Braidwood 1 and 2 'd Nitrite-OH Buffer Tolyltriazole (Calgon) Connecticut Yankee Atomic Power Co. - o Haddam Neck W Potassium Chromate Consolidated Edison o Indian Point 2 W Potassium Chromate-Dichromate Duke Power Co. o Oconee 1, 2, and 3 B&W Chromate-Phosphate o McGuira 1 and 2 W Nitrite-Borax-Crganic Inhibitor (Calgon CS) o Catawba 1 and 2 W Nitrite-Borax-Organic - Inhibitor (Calgon CS) Florid.4 Power and Light Co. o St. Lucie 1 and 2 C-t Sodium Molybdate-Tolyltriazole Georgia Power Co. o Vogtle 1 and 2 W Borax-Nitrite-Proprietary Inhibitor (Calgon CS) 2026U
--- _ _ _ _ _ _ .______.___m_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ . . _ _ . _ _ _ _ _ _ _ _
, APPENDIX 9.2 lf* 7, ,.. TABLE 1 l-
. . . CORROSION IMMIBITOts USED BY Song UTILITIES U -
Page 2 of 3 b. Component Cooling Reactor System Corrosion Utility Supplier Inhibito- *j CPU suelear Corporation o Three Mile Island 1 and 2 B&W Nalco 41L-Organic Pilming l Inhibitor Houston Lighting and Power Co. o South Texas Project 1 and 2 W Nitrite-Tolyltriazole ' Louisiana Power and Light Co. . o Waterford 3- C-E Nitrite-Borta-Tolyltriazole (Calgon LCS-60) Maine Yankee Atomic Power Co. o Maine Yankee C-E Chromate Northeast Utilities o Millstone 2 ~0 - E Hydrazine o Millstone 3 W Hydrazine Northern States Power Co. o Prairie Island 1 and 2 W PotassiuciChromate Portland General Electric Co. . o Trojan
- Sodium Nitrite-Borax (Nalco 39L)
Public Service Electric and Gas j o selen 1 and 2 W Potassium Chromate Sacramento Municipal Utility District o Rancho Seco B&W Hydrazine-Morpholine Southern CaliforTala Edison and
- San Diego Cas and Elcetric Cc o San Onofre 1 W Nitrite-Borax-
- Tolyltriazole (Calgon CS) o San jnofre 2 C4 Nitrite-Borax-Tolyltriazole (Calgon CS) o San Onofre 3 C-E C;1r,on NCS-lower Chloride Concentration
-2026U
g -m.-_. .. I .y, v . ;! {
.'- APPENDIX'9.2'
- W. 4 -l ,
TABLE 1: CORROSION INHIBITORS USED BY SOME UTILITIES Page 3 of'3- , , , :r. : Component Cooling
. Reactor . System Corrosion
' Utility-Supplier
- Inhibite- . , _ _ _ i
- i. . ,
Virginia ~ Power Co. o Surry 1 and 2- W Potassium Chromate
,o North Anna.1 and 2 .' W Potassium Chromate NOTES:
- 1. '_Ab6reviations .B&W: Babcock & Wilcox 1:o..
.C-E: Combustion' Engineering, Inc.
W ': ~ Westinghouse Electric Corporation s, -
- 2. Information reported is description given by_ person contacted. Chemical names may not be'couplete.
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61,!. htipriTeo STATES cOvrax.wrxT g .f L 7.5 88.0523 8 01L [& .&i
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.Cm07d7f 14m TENNESSEE VALLEY AUTHORITY n a w -
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>C. ., ' ?T05 : 'J. F,.Murdock, Chief, Materials Technology Branch, W9 A8.C-K' 5FROM' *L Jim L. Bates, ManagerbChemistry and Environmental Protection - .m (( , IBM 2S 62B-C j DATE ": ' h L' .
SUBJECT:
DIESEL GENFRATOR JACKET COOLING WATER CORROSION INHIBITOR AT 4 ;BELLEFONTa NUCLEAR PLANT (BLN) u I am requesting'.your assistance in determining the acceptability of , the corrosion inhibitor.being used;in the diesel generator jacket, cooling water-at'BLN.. ]
.j
~
J U ~ The corrosion inhibitor being used 'Nalco 39(L), will produce a pH greater than the value recommended by.the diesel generator supplier,. 9
- Imo Delaval.- A Nalco representative has. furnished his
- h. - recommendations in.the attached letter. A Service Information
- ~ .
Memorandum from Imo Delaval describing the pH requirement is also j i 1
' attached.
1
.Please determine whether Nalco 39(L):is' compatible'with the '
. materials in. the jacket . cooling water system. .If Nalco 39(L) is
, unacceptable, please. determine if the jacket cooling water system has been damaged,; since this corrosion inhibitor has been used for i -- several years. ,
i
; Please' respond to this request'with an estimated completion date for 'd your investigation. 'For additional technical information, contact Eugene D. Buggs at' extension 4)J8 in Chattanooga.
L' Y l. b [/ Jim L. Bates
~
- Attachments cc (Attachments):
RIMS, MR AN 72A'C - C. N.-Lester, ONP, Bellefonte l E. A. Merrick, Wil C73 C-K L. D. Reardon, IBM 2S 58B-C 00161 < l 1
- Buy U.S. Savings Bonds Regularly on the Papoll Savings Plan
s 't 1 '
/. ge .i 'd.
- s j ( f ; ;8 j INCUSTRAL OfVIS=ON UTiufv C&4MICALS
. p-
-N ALCO' CHEMIC AL COMP ANY 1230 HURSTDOUANE '.ANE - SUITE 225 ~
LOUISVILLE, KENTUCKY 40222 AAEA S024261211 April!21, 1988 m Tennessee Valley Authority I CST 1A-102A i
' Chattanooga, Tennessee 37402 l
}
Attention: Mr. Eugene Buggs copies: Mr. William Nestel ,
Subject:
PH REQUIREMENTS'FOR CLOSED DIESEL COOLING' l s ,
' WATER SYSTEM BELEFONTE NUCLEAR PLANT
' The nitrite,following silicateNalco MBTproductsbased. 39M and 1355 are all boron, There'is no specific pH range requirements as was'the' case with the former disodium chromate programs.- The. normal. dosage range for.these products at:e 2-4 ounces per gallon'of water in the system.. )
There is-an' organic copper corrosion inhibitor:present to protect the copper alloys. When a 2-4 ounce per gallon dosage range is maintained these programs have'been most c successful in protecting diesel cooling. systems. We. recommend that once per quarter the' water is checked for
.. Tabs.
microbiological growth with milipore or Easi-Cult Bacteria-It' greater than 10,000/cc is present you must add, at a broad spectrum, biocide such as Nalco 1337 D.B.N.P.A. . kill the bacteria. at 50 ppm to , Pleasa do not hesitate to call me if I can be of further assistance. i Sincerely, ! w, .. - 21$ , Y 'd*.i, g; Dieter E. Bronner Utility District Manager
. DEB /meh
. Attachments l
CDcwonatt omCES ONE NALCO CE.N TE A N APE FiV'L L t. 'LL tNOG 6056610Pd dWEA 3 t? 9619d00 L.
- Ej%,. J :Delaval ,
6.w3.wia
'%I i [
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SUBJECT:
. COOLING WATER SYSTEMS - ALL ENGINES h
INTRODUCTION: The fixed water supply in a closed, loop of an engine cooling system I should' bet treated to prevent the formation of. scale and to control corrosion. j
' Raw, untreated water must never.be introduced into such a system. . Distilled '
water or sof tened water with zero hardness'should be used. For the first run of an engine, the use of distilled or sof t water ls. imperative.
~
Transame rica
.e .Delaval.does not specify any particular water treatment program, recommending 1
instead that a water specialist be consulted about the degree and frequency of treatment, dependant on the type of water used. .j There'are a number of competent and reliable water treatment companies Who will contract to properly condition engine jacket water to prevent ! corrosion and/or scale in the engine water jackets and in the piping system and coolers, it is recommended that one of these companies, such as Nalco Checmical Co. , Drew Che.mical Corp. or Magnus Ma-ritec. International be employed. When a con t rac t is written with a water treatment company, it is suggested that a weekly tes t requirment be written into the contract. DESCRIPTION: All cooling surfaces must be kept free of scale or other deposits as any such accumulation will degrade the cooling capability of the system. Any coating on the cooling surfaces will act as an . insulating material and-
-will prevent transfer of heat. If for 'any reason there is a disruption of -
the circulation of cooling water flow, the engine should be shut down as ; soon as practicable to prevent a build up of temperatures and pctssible serious damage to the engine. l The use of ethylene glycol antifreeze in the coojing water.will materially affect the cooling capacity of radiators and other cooling devices. A 50% ethylene glycol mixture will reduce radiator cooling capacity approx-imately 12%. Therefore,. unless the cooling sytem was originally designed for this coolant mixture, the Cus tomer Service Department should be consulted I prior to using such a coolant. SCALE AND CORROSION: All water contains sorre impurities suspended in the water. The impurities in an engine cooling system can forn scale, which will prevent the proper Leansfer of. heat froin the hot engine parts to the cooling water. The use l of distilled or sof tened water in the system simplifies the control of 'l scale; forming subs tances. Generally scale only forms on the hot surfaces I of the internal passages of an engine cooling sys tem, not throughout the entire system. Scale is a very poor conductor of heat. Improper heat transfer, particularly uneven heat transfer, causes stresses in the affm ted ! parts. These stresses may cause cylinder liners, heads and other parts . s , of the engine to fall prematurely. l 1
~
Issue Date Report By Subject 6/23/80(Rev,1 ) Andrew Rush Cooling Water Systems Approved - Enpneering Appr ved - Servi Dept. All Engines.
~
Merno No. I91 Rev 1
' Form E4 44 mM 3m Sheet 1 of 3
=- - __ _.
c - - - - -- r
% WTransamenca , L';", * =
- J O v,.. n Service Information Memo OE y Delaval o* *~"am k'T Y ' i mp'roperly treated water may allow the Internal' surfaces of an engine to become; pitted'by corrosion. The fatigue limit of iron and ' steel is'. greatly F reduced by corrosion. Corrosion In'the cooling system may lead to failure on the lin ers and heads, and may cause serious damage to other parts of
- x. '
s the cooling sys tem. TREATMENT: I
.. 'To minimize serious corrosion and scale deposits, and to prolong t the life of the cooling system, the - treated water must be maintained within ,s specified 1imits. Actual treatment will vary depending upon the nature of the water supply.
The treatment of water in an engine cooling system requires the use of chemicals to maintain the alkalinity and chromate concentration of water at specified levels.- If the alkalinity and chromate concentrations are ! properly traintained, scale formation and corrosive action will be greatly reduced. The pH value must be maintained within the range.of 8.25 to 9.75. A minimum value is specified because lower values can result in accelerated corrosion. To avoid corrosion which occurs in highly alkaline waters, the alkalinity should not be allowed to exceed a 9.75 pH value. k , SODIUM DICHROMATE AND BOILER COMPOUND TREATMENT: Sodium dichromate is a convenient and inexpensive source of alkaline chromate which has been found to forv a protective film on metallic surfaces which prevents attack on the metal by corrosive elements in the jacket wa te r, it must be noted that sodium dichromate is an acid compound which must have an alkaline compound such as boikr compound added to convert the sodium dichroma'te to an effective alkaline chromate form. SODluM AND DISODIUM PHOSPHATE .REATMENT: When using sodium chromate and disodium phosphate for cooling water treament, the . procedures for preparing the system, mixing the solution, testing and controlling the chrcenate concentration and alkalinity are the same as that used for sodium dichromate and boiler compound treatment. The only differences between the two are (1) the chemicals used, and (2) x the amounts used. Vhen using either of the above chemical treaments, specific proportions should be recommended by a water treatment company for the specific water i to be treated and for the water capacity of the sys tem, SAFETY WARNING: 4 i q The chromate chemicals used for water treatment of cooling systems
. are classified as a health hazard. Personnel should avoid any contact of skin or eyes with chromates when in a solid form or in a solution. Also, p breathing chromate dust or solution spray should be avoided. Plant personnel when handling chromate chemicals should be provided with protective issue D n Report By Subject 6/23/80 (Rev 1) Andrew Rush Cooling Vater Sys tem Approved - Engineering Appr ved Servi Dept. All Engines.
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r / ik ro No. .. C' F ! U .-.-- ._
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'. . 3 WTransamenca g=; ,,J- lCo, ,,s Service Information Memo
- ,. x, , E .Delaval o a -
- 2' 1
equipment.- The protective equipment to be used, such as goggles, face shields, rubber glooves, aprons and dust repirators should be consistant with the , type and degree of hazard involved. When skin has come into contact with l chromates, the affected are, should be washed with plenty of soap and water Immediately af ter exposure. ] { 1 WARNING: i .. When environmental considerations are paramount, nitrite compounds ', -such as sodium nitrite (nan 02 ) are suggested as a substitute. However, the selection of a chromate treatment over a nitrite treatment is strongely urged. . Nitrites may adversely affect the fatigue life of the major cast parts, such as cylinder heads. Whenever poss ib le, chrerna te compounds should be used. CLEANING THE JACKET WATER SYSTEM: Should cleaning of the water system be required to remove rust or scale from the Jacket water system, the recommendations of the water treatment company snould be obtained as to a suitable cleaner. Transamerica Delaval's Customer Service Department should be called upon to offer advice as to the compatibility of- the cleaner with the cooling system materials. .
' Whenever It is necessary to change from one type of water treatment to another, comoletely drain and flush the system free of any chromates
. or glycol antifreeze to prevent any mixing of these materials.
)
4 Issue Date Report By Cubject Andrew Rush c ling water System 6/23/80 (P.ev 1) All Engines Approved - ineering Ap ove Se Dept. V L =4fj,,
/
kW Merno No. 191 (Rev 1) Form E 144 W 2) 3n9 o' Sheet 3 3
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- DELAVAL
- l- l '
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}8 _ I ENGINE A%D' , '. ,
i q x.. y? ~ . C0%PHESSOR DIVISION SERVICE INFORMATION MEMO-p,i, j :, p. p p "' a j
'SUByECT: JAC'KET WATERLTREATHENT -ALL ENGINES'
,[ Th'Is Service information Memo is Intended as 'a supplement to Service information t c Memo s numbe r l191. -
' ic .- . in' areas w; here alkaline chromate water treatment compounds.such as sodium ,6 l dichromate are. considered objectionable. by environmental agencies, nitrite ,
. corapoundsi such 2as sodium nitrite' (nan2 0 ) are suggested as adequate substitutes.
f lFor effective corrosion control using nan 0 ;2the concentration must be'500 PPM' wi th a pH of 7.5 to 8.5. w Nltrite compounds for treating engine jacket water. sys tems are available from H most commercial chemical supply houses. Instructions for use of the nitri te- '
,. ' compounds arel also available f rom the same commercial chemical supply houses,
.i - g 4 l
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L l l [ i 1. w ., . . I issuc- 2/14/75 REPORT SY < SUBJECT OATE. A.E.Macomber JACKET WATER TREATMENT AP OVED - E NCf NEERING APPROVE D - ERVICE DEPT. ALL ENGINES z ft
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c.I*4 f a u 4m - uEuo No 191 - A I 3 SHEET I oF I L 1
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' ENCLOSURES WITH LETTER TO MR. LA. ZECH
!i. o- MAY 8, 1989 i <;
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