ML19246A281

For Comment Issue of Reg Guide 1.56,Rev 1, Maint of Water Purity in Bwrs

ML19246A281
Person / Time
Issue date:	07/07/1978
From:	NRC OFFICE OF STANDARDS DEVELOPMENT
To:
References
REGGD-01.056, REGGD-1.056, NUDOCS 7808230072
Download: ML19246A281 (8)

Text

.

Revision 1

• July 1978 f

U.S. NUCLEAR REGULATORY COMMISSION

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@(nM'v ) RM C_ATORV E DE g

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OFFICE OF STANDARDS DEVELOPMENT REGULATORY GUIDE 1.56 MAINTENANCE OF 'NATER PURITY IN BOILING WATER REACTORS A. INTRODUCTION bothng w ater reactors i11% R u by nuint <n ning ac-tepiable purity lescis in the reactor coolant it f urther

(,eeneral I)esig n (.riteria 14

' Reactor Coolant dCscribes instrunlentalli'n as Cep!ablC til the NN(, stall Prewure lloundar),

and 31,

'l racture Presention for deterinining the Londitlori of the re.tcror co<ilant or Reactor (.oolant Pressure lloundary, of Appen-and coolant purificatnin s) ste!ns In 11%.Rs dis A,

• General 1)esign Criteria f or Nuclear Power Plants, ' to 10 CFR P.ut 50 1)on.estic 1.icenune of I roduction and l'tib/ation Facibiies. ' require assur-B. DISCUSSION ante that the reactor uiolant preuure boundary will W.ater quahts control start > during construc tion has e inininial probabilits of erou rupture or rapidls propagating tailure.

w hen estensn e ef f oits are nece. wary to ensure that conipone n t s and piping are clean (,oncern w ith

( sencral 1)esian ('ritenon 15.

' Reactor Coolant proper w ater quality inust star 1 es en bef ore the plant Sy stem l)e ign, require s that the reactor t oolant operates and continue through all operanons until sy stern and associated au silury, t ontrol, and protec-final shutdown..\\taintenance of high water quality is tion sy stems be desiened with sutlicient nurcin to unportant during all operations since w ater is of ten ensure that the design tonditions ot' the reactor tool.

transferred f rom one part of the plant to another dur-ant pressure boun.t e are not euceded during any ing outages and this wa'cr can easily find its way to operational occunen condillon of normal operation, mcluding anticpated the hetw ell and tiom there to the rex tor ces Failure of the reactor cool-In a ty pical 11% R direct or ungle cy cle reactor ant preuure boundary n:a) be postulated w here the s

nechanisnn of general e orrouon and suen enrmion tem I see I Ig i in the appendis ). w ater is boilu by il a nutler liunin heat source

,he steam and means i cracking induced by unpurines in the Nactor toolant i

w ater misture proJuced in the core area pane s are [le sent through sre.un separaton w here much of the w ater is 1 urthermore. (;eneral De gn Criteiion 13.

'In.

re.nos ed. Wer son panes f rom the s;parators to the strumentation and Contivl.

• requirc s that mstrumen-steam dryers h produce relainely di) steam Ilew tation be pros ided to mom'or s ariables and sy stems than 1 10 of a percent moisturei Ihe steam at ap-that can atteet the reactor ^>olant prewure boundary pro s m utely itHH) psi and 591 I ! N Ci enters the mer their anticipated rar or normal operation, main steam hnes and panes through the turhirs to s

.or anticipated operational occurrenses. and for a< co the m.un condenser Conden-:d steam n tollected m dent cotidi tion s as appn priate to ensure adequat_

the hi)tw ell hicated below the coohng tubes 01 the

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safet) oinJenser I.eaks m the conden :r tubes t an result in utrt ulatiac w ater enterine the hotw ell and introducing Ihis guide describes a method acceptable to the

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unpurmes When the circulatmg w ater m the unJen-N RC statt l'or un, lementing thy criteru with regard s seaw ater, the consequences of tube leak s may sers i to mmimi/mg the p:.ibah.hty of coirosion-mduced be quite ugnific..nt; theref ore, specul pret aunons are f.ulure of the reactor coolant preuure boundary in required in seaw ater. cooled plants I)e wrJnon in the condenser reduces the os)een l he sun inn 21 nun her of s han s m thn res w : he a l.

a n ograsnd to mJure the < hages woh hn s m the n g n content of the w ater

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i through fall-th>w demineralizers in order to obtain flow f rom the initial capacity gnes the remaining the purnt possible f eedw ater. The condensate de-capacity.

minernlizers remos e insoluble corrosion products bs Operation of a dem.inerali/er unit af ter its ion-t.iltranon ad remou dissolsed mnic materials, i e.

ewhange capacity has been depleted results in the di-nutals and salts, by ion exchange. They also aiford W pawMrough of ions mto the reactor sewel De-linated protection from large conJenser tube leaks pending on the nature of these ions, stress-corrosion until correctise action is initiated The feedw ater cracking or other forms of corrosion might be accel-pawes through the feedwater heaters and enters the erated, crud buildup on f uel and on other components reactor at about M 5 l' iI W C L Since there is no micht be promoted, and plant radiation lesels mtpht

'.blo w dow n, the reactor w ater concentrates all the be maeased soluble and insoluble materials that enter via the feedw ater in BWRs, the reactor w ater cleanup sy s-The conductisity of the inlet and outlet water of tem perf orms the blowdown function by remosing the demineralizer should be measured to monitor de-soluble and insoluble impurities from the reactor wa-minerali/er performance The monitonng instrument.

ter. T hus, extremely pure f eedwater is prosided by which should be set to ' rigger alarms in the control the equipment as necessary room. should be capable of quickly detecting de-minerali/er breakthrough and should has e suf ficient In llWRs, the sanous heat enhancers of auxilia'}

rance to measure all conductaits lesels up to and in-systems are barriers betw een high-purity reactor ciudine the hmitine conditions of the plant technical

.ater and cooling w ater that may be contaminated specifications that' require inunediate shutdown of witn ihssolsed or suspended solids.

the reactor.

Main condenser leakace is a potential wurce of Esen with hiehl) ettitient condensate deminerali/-

,uch contaminants Such leakage should be ers some contanunants, at sers low concentrations, nunnni/ed by proper condenser design and by prosid-pass into the reactor sessel. Chl'oride ions and high or me f or reliable detection of leakage The rate of con-low pil conditions, w hich mas promote stress-denser leakage may be estimated trom measurement' corrosion cracking of austenitic stainless steel com-of the electrical conductisity of the w ater in the con-ponents and structmes are of particular concern.

denser hotwell or in the hne between the hotwell and the demineralizer A meter with sutticient rance to To control contaminants within limiting condi-measure all water condu;tisity lesels at least up to tions, the condustisity of the coolant at the mlet and the limiting conditions of the technical specifications outlet of the reactor water cleanup sy stem should be that require immediate shutdow n of the reactor continuously monitored The chloride content and pil should be prosided of the reactor w ater should be determin"d per.odi-cally. The reactor should not be operated for ex-T he condensate deminerali/cr sy stem is prosided tended periods of time with the reattor water cleanup between the condenser and the reactor sewel to re-sy stem out of sersice duce impurities from condenser leakage and other 1.im it s on chloride concentration and pil in the sources to an acceptable lesel. A ty pical condensate reattor sewel w ater of ilWRs that hase been found deminerali/er consists of seseral parallel ion ex-acceptable to the NRC, staff. are presented in the ap-whi h servine both to change units, the resins in c

pendix to th.is -cuide Also presented in the appendix remose ionic impurities and to tilter out suspended are represer.tatise limits for the electrical conductiv-ity of the water at seseral other locations m the BWR Depending on the flow rate, ty pe of resin. cleanli.

w ater cycle.

ne w of resm of HWR tull-flow deminer.di/er sy s-tems, and ty pe of ions in the coolan'. total capacit' C. REGULATORY POSITION r

mas not be asailable f or ionic impunts remosal in the condensate treatment sy stem before decontamina.

Condensate denunerali/ers m boiline water reac-

~

tion f actors become unacceptably low during con.

tors should be designed and operated so as to permit denser leakage Demineralizer capacity reduction an orderly shutdown of the reactor in case of serious should be considered in the desien so that there is leakage in the condenser or in other heat euhangers adequate ;apaaty margm as ailabd to permit orderly w ithout contaminating the reactor coolant pressure boundary or core structural con ponents with poten-shutdow n of the reactor in case of a senous con _

denser leak tially harmful constituents of the condenser cooling water. Sutficient instrumentation should be prosided

'Ihere are no instruments that will directly measure so that (1) the electrical conductisity of the cor. den-the capacity of a denunerali/er unit. T he capacity sate is know n, (2) the as ailable capacity of the con-may be determined indirectly, howeser, from the ini-densate deminerali/ers can be determined at all tial capacity of the unit and the calculated flov s of times and i3) the conductisity of the reactor coolant ions throuch the unit. Subtractian of the total ion water at the inlet and outlet of each deminerali/er is 1.56-2 Aq 10

\\4L LOI

know n. Additional protection to the pressure sessel are instead replaced per.odically with material of the anJ core structural components should be prinided in s.une type, measurer ents of initial capacity should the form ot' a tunctioning reactor water cleanup sp-be made on a samr:e of new material at least once a tem and instrumentation to measure reactm water year iw hen the.unc betw een replacements is less wnductisity. An acceptable approa. h is as tolhm s:

than 1 year) e at exh replacement (when the time

~

between rer;acements esceeds'1 yeart When the

1..Ihe licensee should establish appropriate linuts ts pe of anion er cation resin is changed, a measure-f or the electrical conductisity of purit~ied condensate ment of. total capatits ol'ine rephicement resin should to the icactor seuel t the electrical conductisity of. he t

be made prior to use in the demineral zer i

ll\\\\.R t.eedw ater cy cle and that ot' the reactor w ater cleanup cglet Separse lunits nuy be required f or

4. TFe licensee should verity that the minimum re-sudi operating conditions,is startup, hot st.tndby, low sidual Jeminut.ilizer capacity in the riunt dept eted power. high power atu! at t e m pe ra t u re s - 212 F deimnerali/er unit estabhshed in accordance with the i100 Cl reconnuendations of regulatory position 2 is mam-tained l he f ollowing is an esainple ot' an acceptable Chenucal analy ses f or dissolsed and suspended method f or determining the condition of. the de-linpurlilt s shsiuld be pettorined as called f or in the inincrali/er units so that the ion euhange resin can plant technical specifications A conductisity meter be replaced or regenerated bef ore an unacceptable should be pros nied at cash condenser hotw ell or in lesel ot depletam is reached the line between the hotwell and the condensate de-ininerali/er with suttiaent sange to measure at least Recordm3 conductisity meters should be in-a.

all les els of cornfus tisity up to and including the hm-stalled at :he m'et and outlet of both the condensate echnical speatications that iting umdinons of the r treatment ss stem and reactor water c!eanup sy stem require immediate shutdown of the reattor.l he rec-

.Ihe range of Me instruments shoulJ be sutlicient to or dine tiinductis its meters recommended in recula-tory p'osition Li nu; he (ned t'or this purpose -

measure all les is of potential w ater conductisity specified lil llle p! ant technical speciticatisins liir the

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2 The hs e: see should estabhsh the sequentul condensate treatment sy stem. the conductisin meter resin repc' ciathm ttcquency air resin rcplacement readings shimid he calibrated so t h.i t e st iin a t e s of licquenc) lequiled to maintain JJequ..te capatity concenser leakage tan be nude based on aioling margm m the wndensate treatment sy stem f or postu-w ater condut tis ity. condensate t ondut tis ity and lated condenser coohng water iricakage l he capa<

tiow rate

~I he t henucal temposition of the cooling ity iequued and w:respondm _ resin regenerahen er w ater and its relation to specific wndut tance should replacement t:equency wul depend on sescral be estabhshed and periodically wntirmed so that es paramc!cis mciuJin con &nser coohnp w a'er com timates of reudual deminerah/er capatity can be posnion t hlotide concentiation. tion rate in each made deminerali/er unit. type and quantity of resin.

b A : miding tion meter should bt used to

' ostulated wndenser len-measure the rate of t'ow through can deminerali/er t ation amon r esin ratio.

n age. and time f or orderly teamor shutdow n

't he quantits of the prmeipal um s) hkely to c

1 l.he initial tiital c.p.icits ist the nea at.ntn ai:J cause denunerah/er breakthrough should be calcu-t ation denaneralizer resins should be measured leed bs:

Anion enhance t apx ity may be deternuned bs a prmeJure iccom, ' ended by the resin manutatturer (l a Cons erting the conductis ity rea J m of s

e t he tool eschange capaity of the cation resm nu) the water enferms the deiainerah/er to procedure reconnnended by the weight traction t e 3 ppm or pph) of the be measured by a i

le sin n!.in uf actu r el sir b) parapraphs 41 thri>iigh N ist principal um s) and

=

TS I \\1 IC I C 71.

Starda:d Nlethods of Test ot

=

Pn.~s s:cJi and t.hemi< al Pni;ierties ist h i n - 1..schapet

- mer time the pr od u c t ol' s on t 2 i Intecrannu centratitm of this is m 's ) and den:inerali/cr Resm s I:or re sins that are to be regenerated. these flow deternunanons should be repeated at least 'ennannu-all) Ihe resins sllould be diss ardCd Jnd repl ACd The input quantit) ot~ iom s ) til the demineralizers when their capacity f ollow ing regeneration talls shmid be deternuned at a f requency adequre to en-beliiw NI pert ent tit the !nitial s aluC. bltirC llequCnt stire suttiCient residual itm CsthangC cJpaCil) in the dJte r lill n at ti, shiiu!d be made at plants tising seawa-es ent ed a mapir (<>ndenser leakage tii present es-s

!ct til ' t hei wfer utWtJ!ning largC amtiu n t s t il dlN-(ecding reactor C(gil ant !!miIN sols ed or su spe 1.!, d nlatter as ctY! ant in their heat d l aih demlncIall/c r unit slh6u!d be replased tir eschancers I or resms t h m, are not regenerated but rCgenerated when the renunung capacity realculated by subtractmg the total utilization deteinuned tmm i

-l't<.

Ih sn.

, a r % s ie's to is

• (.i'm. r a s.

W! act s ay and thin lilea su re me n t s in A cord. nit n i stn ra

!Oln R u e Y:

. Phi! 4 l :.W a. Pe e r o !.

u 19m with regulatory p< >sinon 4 c trom the imtial capacity l

9 9 (1j ^

1. W 3 1

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deteninned in accordante with regulatory positmn A trolltl tc ensure neunal pil. T he licensee slauh!

approathes the nuninlum residual deniinerah/cr estabhsh hnots f or tonductis ny, pil. and t hiondes in capacity deref nlirled in itcc()rdante with regulatory the reactin s ewel w ater.iiiJ siniiald specif y prise-posinon 1 Ihe accuracy of the abou calculation dures to be used for their deternunation Acceptable shouhl be checked by incasurements nude on resin reactor water t henustn lunits are pnen in lable I of samples taken when derninerah/cr unus are reinosed the ap,nendix to this guide If the linunng s.due~ of f rom sers it e for regeneration or resin cleaning.

the conducinity. pit. or thloride c ontent are ex-Measurements on samples f rom ca h urut shou;d be cceded. approprure t or rectne acnons as defined in nude.o ex h of the first two such remosals f rom the plant technic.d spetificanons should be tA en sers he and at escry litth such remos al f rom sersice thereaf ter. ll approprute, the ctual measurements may be used to ad ust the calculated ulue ot re-i.h:,1 D. IMPLEMENTATION i

dCilliner.ill/cr cJp lt ity

.hllt h ad iistnient and its t

.s-titication should be reported to the NIK in the l he purpose of ttus secnon is tii pros ide nitornia-annual oper.it me report non to appht ant s and licensees reg.udmp the NR('

slalt 5 plans lair ustrip this (Cpulahuy guidC

5. t he unlductis il) n eterls) lt$cated at the inlet md ouJet of the denunerali/ err si of the condensate Wuh the escephon of the snunendanon of regu-ITCatWefit Ns stCn1 and the re.x hpr w ater cleanup s)s b

I O

I I) tem should be ser to Inceer alarms in the control as apph d io operanny plants. ilu s guide rellet ts cur-rtMin) w bCn. as it fillnllillini. cilher <it the tiilhiwine wnt N R( ~ a.it t pa th e IMetine, extyt in tin m t onductis ity lesels is reached is alues of which

'"'es in wluch the apphcant or hcensee pioposes an should be deternuned bs the htenseci act eptable a'rernatn e method f or c omply ing w ith spet it 'ed

. s t h il's tit the (inillllt ssitin 's r Cplilat hin s lhe lesci that unhcates inarginal peitornunce the inc>hou descnbed herem is beine and w ill con-a ol the denuner.b/ r ss ster.n unu

o bi used m the es aluation of subnunals in cair r'il6tn w it h 45perattnp lis e n se 15r t i$ll st l ut t hin b i lle lese, t h.i t 111d i c.lle s ruiticCab,C brCak-l

'hriiugh ist..ne iir nuue deniiner aliters pe:rillt i.t$pils tthuis u ntil IIlis pillde is rCsisCd.ls ilrC-stilt l >'

.s p p e st h 41s t i t ifil the pt!!'lic tir addirliinstl stJit 6 l he thloride content m the re.a tor scoel w atei Regulatory position 1a w ill be uscJ in the resiew shouiJ be in. untamed as low as pr t rical I he ionic es aluation of the perf ormance of operating plant cquihbru of the reactor s essel u.ner should bc ton-lhensees on a case by c.ne basi-O q

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APPENDIX

~Ihe data presented in this appendis illustrate the trol in llWR Coolants.

General lilectric Report watcr quality lesels acceptable to the NRC staf f f or NiiDO-IIH99. 71N!!D59. Class I. June lu73 ) This the llWR reactor s essel and condensate sy stem relationship is acceptable in establishing appropriate Table i prosides conductisity. pil. and chleride lim-conductisity pil Innits anu alarm setpoints.

its f or llWR reactor w ater during s arious plant operating conditions. including maximum acceptable Table 2 prosides conductisity hmits f or the coo-les els f or short durations and special conditions The densate treatment sy stem to ensure maintenance of relationships arnong conductisity. pli. and chloridc

'eactor w ater qumlity limitations. ~1 he hnnis indicated concentration in water at 771 (25 C) are p zsented in establish action points l'or the correctisc actions re-l'igure 2 of this appendis. IReterence ' Chloride Con-quiret' to maintain reactor w ater quality linuts.

~

mm 1 56-5

TABLE 1 ACCEPTABLE RE AC FOR WATER rHEMISTRY LIMITS 51 AXINIUNI PA R A51ETER LIN!!T I.IN1tT Spet ific Conductam - at 77'F (25'C1

1. Power Operation Steaming rates greater than 19 of rated steamflow I pmho/em" 10 gmhoLem

2. Startup Hot Standby and Power Operatian Steaming rates less than 19 of rated steamflow 2 pmho'enf

3. Cold Shutdown Reactor is not preuurized li.e.,

at or below 212 'F (100"C)]

10 pmho em Chloric e

1. Power Operation Steaming rates greater than 19 of rated steamflow 0.2 ppm" 0.5 ppm

2. Startup Hot Standby and Power Operation Steaming rates less than 19 of rated steamtlow 0.1 ppm

3. Cold Shutdown Reactor is not pressurved li.e.

at or below 212 F t 100'C)}

O 5 ppm pH at 777 (25'C)

1. Steaming rates greater than l'i pH not le s than of rated steamflow 5.6 nor gret tc than d.6

2. Reactor is not prevsuri/ed li e.,

pil not less than at or below 21TF (100 CH 5.i nor greater han 8.6 Time abose I prnbo cm at 7TF.25'Cp and n 2 ppm t hkiride not to e uced 72 wurs for any single int:Jent. but tho

? for all a

insidents should not e uced 2 w eek s per y ear W hen the time limits are ence,!cd. an orderly shutJow n should br i.

within 4 hours4.62963e-5 days <br />0.00111 hours <br />6.613757e-6 weeks <br />1.522e-6 months <br />

• W hen the ma simun, tonduttnity or t h.oride conte ntrati.n limits are euceJed. an orderly shutJow n should be initiat6 hately,

and the reattor should be brought to it.e tolJ stanJby condition as rapidly as too Joa n rate permits

' Time ahose 2 pmho em at 77'E (25 C' and it 1 ppm th!ortJe not to cured 48 i ours for any single ouurrence W hen she time limits are cuecded the reador should be brought to the hot shutdown condition itntil tie hmits are restored d The reattor should be shut dow n if pil is - 5 6 or A 6 for a period of 7 hours8.101852e-5 days <br />0.00194 hours <br />1.157407e-5 weeks <br />2.6635e-6 months <br /> TABLE 2 ACCEPTABLE CONDUCTIVITY LIMIT OF CONDENSATE SYSTEM WATER SPECIFIC CONDCCTANCE AT 77~F (25 C)

( p m ho.'c m )

I.ocation I.imi "

N1aximum Limit

Conden sate Inlet to Demineralizer 0.5 10 Treated Condensate Combined Demineralizer Outlet O.1 0.2 Individual Demineralizer Outlet 0.2 0.5

• InJicating (ondenser leak ace or marginal dcr ineraliter performanic requiring 6 orrec tne attion t< be taken as defined in plant techn -

s al spec ificaOns

• Ind:cating orderly reactor shutdown and'or wrrectne actions to be taken immeJiately.

1.56-6 q

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-,ERS CLEANUP 3

SYSTEM l

I DEMINERALIZER

)

CONDENSATE U

DEMINE R AllZE RS STR A!NER Figure 1 BWR WATER CYCLE 142 286 1.56-7

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13 pH Figura

CONDUCT!VITY,I

'O CHLORIDE CONCENTR ATION OF

_ JUS SOLUTIONS AT 77 F (26 C) 1.56-8

UNIT E D S T A TE S NUCL E A H H E G U L A T Oi4 Y CQVMISSION POS T f G E AN D F E E S PAf D

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