ML20236F435

Safety Evaluation Supporting Util 870825 & 0923 Requests for Relief from Inservice Insp Requirements for Hydrostatic Testing of Svc Water Sys.Requests Granted

ML20236F435
Person / Time
Site:	Haddam Neck File:Connecticut Yankee Atomic Power Co icon.png
Issue date:	10/26/1987
From:	Office of Nuclear Reactor Regulation
To:
Shared Package
ML20236F376	List: ML20236F372 ML20236F435
References
NUDOCS 8711020141
Download: ML20236F435 (4)

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u SAFETY EVALUATION-BY.THE?0FFICE'0F; NUCLEAR REACTOR REGULATIONS R,

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'CONCERNING RELIEF FROM INSERVICE' INSPECTION ME0VIREMENTS i

.f. MM FOR HYDROSTATIC TESTING ~0F THE SERVICE' WATER SYSTEMS by u

CONNECTICUT. YANKEE' ATOMIC'POWERECOMPANY-

,h H'ADDAM NECK PLANT'

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1.0 BACKGROUND

m Paragraph 10 CFR 50.55a'(g)(6)(i)Iauthorizes;the Commission tofgrant; "

relieffrom'thoserequirementsithat'are?impracticalltoiperform:onicomponentsc of nuclear. power plants. classified asLASME:CodeLClass11,'2, and:3 given?

the' plant's' design.igeometry, andLmaterials1oficonstructiontof(the components

upo_n making the necessary find.ings.;

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i By'lettsrsdatedAugust25,fl987-LandISeptemberl23,1987;:CYAPCO-(theilicensee')'f

~ determined that'certain inserviceltesting: requirements of theT1980 Editioni T through' Winter-1980' Addenda:ofiSection XILof1theASME Code at?the1Haddam; Neck i '

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Plant are. impractical; tolperfonn during theLsecond ' ten-yeariinspectionkinterval. :

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Specifically, the~ licensee? requested: relief fromLperforming alhydrostatic?

test of the-service water system andrthe:reactorLcoolant pump seal.:fwaterL return system, respectively, at.' test" pressures required by Section1.

17,

n XI~oftheASMECode,' Subparagraph-IWA-5265(b).tThelstafffs'evaluationofftheT H

licensee's requests follows.

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d 2.0 RELIEF REQUEST AND TECHNICAL JUSTIFICATIONS.

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Service Water System a

i A.

Code Requirement s

Per Section XI of the ASME code,1980 Edition;with Addendaithrough Winteri j

1980 Subarticle IWD-5223(a) states.that;the system. hydrostatic test; pressure' Psv shall'be "...the lowest pressure setting among the numberJ

'N of sa.fetyor-relief valves provided for overpressure protection'withini e e

the 'bo' ndary of the system ta; be -tested." LFurther,(SubarticleDIWA-5265(b)/

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u requires "...the imposed pressure'on anyicomponentGincluding stactic" '

1 head, will.not exceed 106%.of:the specificStestipressurelfor the system):

B.

Code'Relfef. Request

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1 Purs'uant to 10 CFR -50.55a(g)(5)(iii)',' relief is. requested?from performingj y -

the system hydrostatic: test at4the: required test! pressure for. all:

elevations within the system.

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[C..: ~~ Licensee's; Bases for Requesting Relief!

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n Portions;of theJabove' system exist within thefsystem hydroststicitAsth t

bo'undary such that; variations? in elevation withintthe boundary 1wouldL.

. result;in; imposed component pressures;in ekcessiofs6%fofitherspecifiedi 4

test pressure. :From the210westFportionsof?the< systems (floorilevelT '

wheregthe RHR heat"exchangers1are slocated,LelevationM19')Ltosthet BuildingE(PAB)F M

highest! portion of(the' system;(the' Primary? Auxiliary;Televationi R.

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serviceiwater headsr, elevation;50N 6") represents an (difference of 69'c6"!andicorrespondsSto a staticLheadLofgapproximatelf; pressures for:the service water: system. 9The'minimumnallowed;off te'sti '

.30l psi; Thiscdifferent_iallisLgreaterzthanLtheiallowedrange test pressure for the?Haddam' NeckI P1 ant (service, water system}isy121 psigg,

?J whilesthe; maximum. allowed test [ pressure 1si106%iof thisforL128(ps A"

c This, allows only a?7fpsi rang'e!andFthereforeh unlessithe?systemican!

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.belisolatedtto? limit'the effectstof aistatic; head to"less than67; psi k "

ithe Code requirements cannot be met d Therefore,tittis CYAPCO'sidesir

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specifiedtestpressure(as'requiredby.SubparagraphtIWA-5265(b)).i W"

4 Thus,"due to the effects ofc tatic head.[ portions;of3thelpipingLat#

higher elevations'will;be subjected tofaLtestipressureslower/thanN i, T s

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Code requirement.; L There is: no.practicalj method?forsisolatingstheipiping : <

segments.to achieve 1the required 1 test pressure latfallfelevations./ ! !

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' D.

Proposed Alternative Examination '

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Hydrostatic testing)of theiservice watetsystemithaticannotlbeX L

isolated to meet the system 3testTpressurelatsthe test boundary;high!

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point and the 106%.. system test pressure maximumLat theitest} boundary; low point shall be conducted by pressurizing;tofl06% ofitheisystem1.'

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test pressure at the: low: point'in' theitestiboundary', Instrumentation). '%

will be set up?at the~ RHR heat exchangers!toLindicate(when11281psignis' be.noted and is expected to belat approximately 98Tpsig..

L attained. ~ Pressure indicationfat>the: upper;1evel!ofLthe PAB will:also o

E.

Evaluation The Code requirement is impractical. to achieve In:situationsicited b[the' exist between the systems high and Llow: points during thejbydrostatic tes licensee without system modifications. LThe' pressure differentials 3which r

1 do not warrant:such modifications nor are'they; significant enough;to changei the;resultsifthefrequirementswereiimposed.;Because'theinormal;#stemi as. proposed-would assure that the' hydrostatic test: pressure;(ydrostatic operating pressure is: approximate 1yL65 psigL performing)the'h s

128 psig!toS,

98:psig) wouldibelmuch greater than 110% of the? system operating pressure.t Therefore,:the~ licensee's; proposed. alternative test pre _ssures Will! provide",.

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the assurance; necessary to' assess the ' system's continuedistructura1Lintegrity.x The~ staff,therefore.. concludes /thatTrelieftfromtheCodefrequiremeryt;maylber-p grante' dias: requested.3

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Reactor Coolant Puinp (RCN SAal WatsiR'eturn System h

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Code Requirement, a

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PerSectionXIof,theASMEc6ds,:1980 Edition with; A'dderidai th'rougtr Y 'I

.. Winter 1980L Subarticle IWD-5223(a) states;thattthe:-system hydrostatic test pressure ? Psv; shal1 J be. '.'...theilowest pre'ssure msetting9mong the?

y numberL of. safety or? relief valves provided for: overpressure. protection j

within the boundary'of the system to be; tested.'" lFurther, Subarticlet.

,y IWA-5265(b) requiresD"..;the: imposed pressure-on any;componentWincluding1 '

'y stactic' head, will:not exceed 106% ofs the sp'ecific test! pressure, for: ',

a the system."

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B.

Code Relief Request, l

Pursuant to 10.CFR 50.55a(g)(5)(iii),t relief is' ' requested ?from performing; elevations.within the'systeme

j thesystemhydrostatic'testat,therequiredtestfpressureLforall.-

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C.

Licensee's Bases for Requesting Relief?

m Portionsofthelabove'systemlexistwithinLt'hE;systemh'ydrostaficltes't?

boundary such that variations 11n elevation ~ within the boundaryLwould 1

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result'in imposed component' pressures;in excessfofE6%;ofcthe specified test pressure.

From the; lowest; portion ofjthe. system;(floor' level!,g j,

where the seal water heat exchangeriisilocated.1 elevation-19')Lto the' d

highest' portion of thefsystem-(BA-MOV-366 and'369 located'on thetisto aj level.of the primaryiauxiliary building)Drepresents -an elevationc difference of;45' and: corresponds 1 olaistatictheadEofTapproximately g l3 t

L 20 psi..:This-differential?is greater thanithe' allowed range;ofitesti d

pressures for the RCP ' seal water returnisystemL The' minimum alloweds

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-test pressure for the'Haddam: Neck Plant RCP-seal 4ater return system-0 is 154 psig while the maximum allowed l test pressurejisl:106% of thisfor H

i 163 psig., This-allows only.a9l psi: range and,stherefore, unless!thef, j

system can be isolated.to, limit the' effects of2a;staticihead;to less-1 than' 9' psi, the Code' requirements:cannot be:meth Therefore, Lit is; CYAPC0's' desire to limit theitest pressure imposed on system components, i

to 106% of the specified. test?pressu'e. Thus,1due;to thel effects'of' j

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statichead, portions:ofthe; piping;at.higherelevations(willbei.

s subjected;to a testlpressure lower than that 'specified:by?the Cod

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There;is no practical method for isolating the, piping:segmentsito 4

achieve the required test pressure'atiall; elevations.L D.

Proposed Alternativ'e Examination' Hydrostatictesting'oftheRCPseal;waterLret'urnsystemithatcann'otbs; c

isolated ~to meet thelsystemitestLpressure at the: test boundary highi

.po n ;an 'd the'106%! system test pressure 1 maximum at'the test-boundary" y

it low point shall7beLeonducted by pressurizing lto?106% of the system".

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testpressure~attheilowpoint;inLthiftestiboundary.dInstrumenta-L s

tion will.-be; set.up atsthe lowest accessible point to indicate;whent 163 psig is. attained.

Pressure' 1.ndi. cation;at the ; upper level Jof?.

G thePABwill:alsobenoted'andLisiexpectedtobelatapproximately/s

. wy 140 psig.-

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Evaluation >

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The CodeLrequirement'is!impracticalLtotachieve in; situations cited-d c

by the licensee?withoutisystem modifications'.1;Th'e'pressurefdifferent-A d

ialswhichexistbetweenthe;systemsfhigh'andlowpointsLduringithej

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-hydrostatic test dolnot warrant 1such modifications:nor;are;they a

significant. enough - to : changejthe resul t'slifithei r' requirements /were !

W imposed. 'Because the normal system operating? pressures:are:between 9 d

40-60' psig, performing 'thelhydrostaticLtest as: proposed;wouldRas'suren thatthe\\ hydrostatic. test. pressure-(163?psigto:140:psig)wouldibel Wj muchgreater!than110%of.~the'systemoperating[ pressure.(Therefore,,

the licensee's. proposed alternative test pressures will; provide!the assurance necessary toLassessitheisystem's continued / structural' integrity. The staff, therefore ? concludes:thatnreliefjfrom1the; Codef,

h requirement may be granted asLrequested

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3.0 CONCLUSION

1 By letters dated. August.25, 1987..:andiSAptemlierf23, 1987, CYAPCO.hadh s

requested relief' pursuant to 10 CFR.50.55a(g)(5)(iii) from1certain Code '

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required tests :for' the service water and'RCP seal waterireturnisystems on?

the basis that the' required-tests areLimpracticalitoLperform.7(The staff" 3

has reviewed!the licensee's submittalscandih.as;concludedLthat.fpursuantato

-10 CFR 50.55a(g)(6), the Code" requirements would:be:< impractical to perform M

and that relief from therspecific'Codeirequirementslis" authorized byilawi d

and will not endanger? life.or: property ors theicommon defense and : security 1 o

1 and is otherwise in the public.i~nterest gi.ving due consideration to thel' burden upon.CYAPC0 that would result'if the specific CodeLrequirements 1

were imposed on the Haddam Neck flant.

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f 4.0 ACKNOWLEDGEMENT

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Principal Contributor: F. Akstulewicz,' PDISA,: NRR and G. Johnson,;EMTB,: NRR.

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Dated:

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