ML20038C589

Proposed Tech Spec 3/4.7.9 Changes Re Snubbers

ML20038C589
Person / Time
Site:	LaSalle
Issue date:	12/08/1981
From:	COMMONWEALTH EDISON CO.
To:
Shared Package
ML20038C588	List: ML20038C587 ML20038C589
References
NUDOCS 8112110254
Download: ML20038C589 (19)

Text

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~ O 3,4.7.9 sNussEas LIMITING CONDITION FOR OPERATION 3.7.9 All snubbers listed in Tables 3.7.9-1 and 3.7.9-2 shall be OPE 8ABLE. APPLICABILITY: OPERATIONAL CONDITIONS 1, 2 and 3, and OPERATIONAL CONDITIONS 4-and 5 for snubbers located on systems required OPERABLE in those 0?ERATIONAL CONDITIONS. ACTION: . With one or more snutbers inoperable, within 72 hours replace or restore the inoperable snubber (s) to OPERABLE status and perform an engineering evaluation per Specification 4.7.9.c on the supported component or declare the supported system inoperable and follow the appropriate ACTION statement for that system. SURVEILLANCE REQUIREMENTS 4.7.'9 Each snubber shall be demonstrated OPERABLE by performance of the following augmented inservice inspection program and the requirements of Q Spe'cification 4.0.5. a. Visual Inspection Tl:e fitst inservice vist.al inspection of snubbers shall be perform'ed after 4 months but within 10 months of commencing POWER OPERATION and shall include all snubbers listed in Tables 3.7.9-1 and 3.7.9-2. If less than two snubbers are found inoperable during the first inservice visual inspection, the second inservice visual inspectian shall be perfo'rmed 12 months 25% from the date of the first inspection. Otherwise, subsequent visual inspections shall be performed in accordance with the following schedule: No. Inopcrable Snubbers-~ . Subsequent Visual cer Inspection Period Inspection Period *# \\ 0 18 months 25% ^ 1 12 months 25% 2 6 months 25% 3, 4 124 days 25% 5, 6, 7 62 days 25% Q 8 or more 31 days 25% The snubbers may be categorized into two groups: Those accessible and those inaccessible during reactor operation. Each group may be inspected independently in accordance with the above schedule. O Cl_he inspection interval shall not be lengthened more than_one step at a time. )

1. The provisions of SpeciTiiation 4.0.2 Wnot afpTica'ble.

LA SALLE - UNIT 2 3/4 7-26 3EP 1 1981 s

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Re vise che cinid ps>W as Ws : i f i+ is believed Ik,1 ihe sebbe vnay hwe been danmyeJ fo tAe exied %+ if my 20+ Ecelle o perfonn lls f ec+ ion fles tAe affec+ed .- Sum bbet is f uncliomily ie, sic) in W as l'oss d coaJ;+ ion an} deleven;ne} opentile (er Sseveillesce Repiremi 9 7.1. e. If it is dereemise/ fAat p perforn;ny +1e corr <\\ive act;0n +be sndher wo id e appear 'o he able 'a perfor n ih kcrion, which tvant/ usup h de cese if & reason for refecfi,n was ded io the shu%er c+ac.bment.s or su,oportiny s+va%a, 4kes %%l tesilb, b /e prov/oig is ne yepired l hedersint N4Y Se ShubbeF [J opere ~ o l sud snablers are ineladed in % representallve swp e OTJh4bhfrfhobe Mbchi0haf Tej fe fehEXf--[rnc hscr:bd in kveill ue suek heniy s yepiced i as 0<pire=t 4. 7.1. C. Bases : TkA there are cases when a fusc+ia,,4 test %U he perFamed H veyi(y!. For eennp,l operd;liby there are cases when it shcald na he ytyiru 9 it a sbubber iniled a vis-l inspection because of a loose affadment holt, fAe prdle,n could easH he y

Lt. 71. l3 Oves (loo.] Corredul l s:~pl kyk}cueny H e ko W, U e y y correc{ive action would Feslote the shmfbei lo. as operulle s}mbs. Ilete n:nklbe no reason fo expe et f urthe das,ye fr.~ this type of problem e woulJ W be neuessay b puform all fhe mea sure rne nis of 4, 7. 7. e. b b as;u ran ce h provded h indJiny su& shdhen in tfe represedufive f sanple wlen if e fudionul ie.sHny comes due 9s desc6 bed ta Smivillwe R<pirened 4 71. c. i

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i ~ ~ - ~~~ b. Visual Inspection Accentance Criteria -~~ 1 . Visual inspections shall verify _(1) that there are no visible indications 3 of damage or impaired OPERABILITY (2 or supporting structure are secure,, an)d (3) in those locations where snubber movement can be manually. induced without disconnecting the snu that the snubber has freedom of' movement and is not frozen up. Snubbers' which appear inoperable as a result of these visual inspections may be determined OPERABLE for the purpose of establishing the next visual inspection interval,'providing that (1) the cause of the rejection is clearly established and remedied for that particular snubber and for other snubbers that may Onctionally tesSc in the as found condition and determined O i 'wnen a fluid jart Ff a hydraulic snubber is found to be un j ~ i snubber shall be declared inoperable and cannot be determined OPERABLE b i functional testing for the purpose of establishing the next visual l inspection interval. All snubbers connected to an incperable common hydraulic fluid reservoir shall be counted as incperable snubbers. c. Functional Tests During the first refueling shutdown' and at least once per 18 months 2 thereafter during shutdown, a representative sample of snubbers shall

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be functionally tested. For ' hydraulic snubbers, a representative sampje of at least 10% of the total of hydraulic snubbers-listed in Table.3.7.'9-1 shall be functionally tested either in place or in a bench test.. For each hydraulic snutber i that d:as nc. mest the funi icnal test acceptance criteria of Surveii-iance Requirement 4.7.5 d or 4.7.S.e, an additional 10% of the hydraulic snubbers shall be functionally tested. t i ror mechanicel snubbers, a representative sample of that number cf mechanical snubbers listed in Table 3.7.9-2 which follows the expression 35 (1, j)', 3 where c(") is the allowable number of mechanical snubbers not mseting tne 4 g 1 j The value will be arbitrarily chosen by the applicant and incorporated into [ the expressicas for the representative sample and for the resacple (prior to the isscance of the Technica.1 Specificatiens). The expressions are intended I fer use in plants with larger number: of safety-related snutbers (>500) and provide a confidence level cf apprcximately ES% that 9C% to 100% of the snubbers in the plant will be OPEPABLE within acceptable limits. 4 That is, the confidence level will be provided no matter what value is chosen for c. It is advised, however, that discretion be used when initially choosing the value for 7 c because the lower the value of c (the lower the amount of snubbers in the t represer.tative sample), the higher the amount of snubbers required in the re. sample will be. To illustrate:.If c = 2 and 3 snubbers are #ound not to meet the functional test acceptance criteria, there will be 70 sneboers in the i j representative sample anQ 31 snubbers required for testing in the re-sample; .' hI If c = 2 and 4 snubbers fail the functional test, there will be 70 snubbers in i the representative sample and 62 snubbers required for testing in the re-sample; If O and 1 snubber feils the functional test, there will be 25 snubbers in i the representative sample and 140 snubbers. required for testing in the re-sa:Ple; If c = 0 and 2 snubbers feil the functions test, there will be 35 snubbers in i the representative sample and 280 snubbers required for testing -in the re-sample. 4 ~ La, d u t:; - Ulu.._.iA s /.,,

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......m., u, INFORMA i!JN im'.j a... :.A..._m...,i. r, m m Q f 23 I PL; " cvPERS- ~ n -- r i,.,--., { 8..Cu a U ti l.'t..i g;q ; 1 SURVEILLANCE RE0VIREMENTS (Continued) ~ ~ Functional Tests (continued) ^ acceptance criteria selected by the operator, shall be functionally \\ tested either in place or in a bench test. For each number;of mechanical snubbers above c which does not meet the functional test acceptance criteria of Specifications 4.7.9.d. or 4.7.9.e, an additional sample selected according to the expression 35 (1 + y) ( j)2 (a - c) shall be functionally tested, where 2 a is the total number of mechanical snubbers found inoperable during the functional testing of the representative sample. j Functional testing shall continue according to the 2xprission f' b [ 35 (1 + j) (c 1) ] where b is the number of mechanical snubbers found inoperable in the previous re-sample, until no additional inoperable mechanical snubbers are found within e sample or until all mechanical snubbers in Table 3.7.9-1 and 3.7.9-2 have been j functionally tested, The representative sample selected for functional testing shall { include the various configurations, operating environments and the range of size and capacity of h At least 25% of the snubbers ii)ydraulic and mechanical snybb the representative samples shall include snubbers from the following three categories: 1. The first snubber away from each reactor vessel nozzle. 2. Each snubber within 5 feet of heavy equipment (valve, k pump 3 turbine, motor, etc.). 3. Each snubber within 10 feet of the discharge from a safety I relief valve. j Snubbers identified in Tables 3.7.9-1 and 3.7.9-2 as "Especially Difficult to Remove" or in "High Radiation Zones During Shutdown" shall also be included in the representative sample." Tables 3.7.9-1 and 3.7.9-2 may be esec jointly or separately as the basis for the sampling plan. In addition to the regular sample, snubbers which failed the previous functional test shall be retested during the next test' period. If a spare snubber has been installed in place of a failed snubber, then-Permanent or other exemptions from functional testing for individual snubbers O in these categories may be granted by 'the Commission only if a justifiable basis for exemption is presented and/or snubber life destructive testing was

erforred ic qualify snubber eperability for all design conditions at either the completion of their fabrication or at a subsequent date.

LA SALLE - UNIT 1 3/4 7-25 N I l

4 4 e S l %. 7.1. e Re v.a 4!se circled portion 95 follows : OP iheFfiq depehbn( 4Cc EfeFAfien f>hif[nyinec/4h(rn[ subbers whose Scusiny rnedanism is hot in line w;M 4e primery load dk, tke f orce repired +o i ; Hale. p or ineinhis >no+ioo of tAe sadler is wHAin & . 5 pet;fied reye in balk divedins of +rsvel. for oMer pes of sndkrs allev % +b.s< o'esci;feldue lt shil ano be ver;4iel %- {ke bree%y (v;ckn dnyJoFce sl,L u.t hve increechore rhan roh since tAe f survaClance tes}. u I

a. Aciivdion Crotreiy ec6/ is uAjeve/ w; fain th specified vnye of ve. oei+y or auelevdion in both feazio,s on/ cogr<srion,e.xceg !Aa inerfia degesd<,nt, aealernon i,,ikiny rnedanical n,b bets wf ose Sens;ny Pnedawif m O hof in line vei/4 f/e f rir-ej%dion +sves piec e in hofk </ ire c f +n vel.

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?oad wiF6c disp nceraen+ shall be verifiel-93E). on.vuid Inns b.uys ])ech hel[withibevthdo:eofikcVils hpenhd we adion %%y e,auacal subku wkase sensiny n ed,-isn n no t in lige witbwpr;wy aal l ,h%. ik desu3cd h>liy ls in a c corkna a,l} b r< < sin-n-Enyin ers. It 6. ci d io.a f H rn % vekhn App ceIioh li e SdY Yhd the fesi:hy hju;}ptl ol]ove wo^l ANC14 0!If peiry ny publons i8 fu snMo's 4: liv k penom in fundios.

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PLANT SYSTEMS SURVEILLANCE REQUIREMENTS (Continued) Functional Tests (Continued) both the failed snubber,' if it is repaired and installed in another position, ~and the spare snubber shall' be retested. Test results of' these snubbers may not be included for the re-sampling. ~ If any snubber selected for functional testing either fails to lockup or fails to move, i.e., frozen in place, the cause will be evaluated and if crsed by manufacturer or design deficiency all snubbers of the same design subject to the same defect shall be functionally tested. This testing requirement shall be independent of the requirements stated above for snubbers not meeting the functional test acceptance criteria. ) . For any snubber (s) found inoperable, an engineering evaluation shall be performed on the components which are supported by the snubber (s). The purpose of this engireering evaluation shall be to determine if 1 the components supported oy the snubber (s) were adversely affected i by the inoperability of snubber (s) in order to ensure that the supported component remains capable of meeting the designed service. d. Hydraulic Srubbers Functional Test Accectance Criteria O The hydraulic snubber functional test shall verify that: 1. Activation (restraining action) is achieved within the specified f f ange of velocity or acceleration in both tension and compression. 2. Snubber bleed, or releas,e rate, where required, is within the specified. range in compression or tension. For snubbers specifi-cally required to not displace under continuous load, the ability of the snubber to withstand load without displacement shall be verified. ,e. Mechanical Snubbers Functional Test Accentance Criteria Tne mechanical snubber functional test shall verify that: 1. The force that initiates free movement of the snubcer rod in N either tension or compression is less than the specified maximum \\ breakaway friction crag force. Breakaway friction drag force shall i not have increased more than 50% since the last surveillance test. ~ Activation (restraining action) is achieved within the specified 2. range of velocity or acceleration in both tension and compression. 3. Snubber release rate, where required, is within the specified range Q~ in compression or tension. For snubbers specifically required not to displace under continuous load, the ability of the snenber to withstand lcad without displacement shall be verified. LA SALLE - UNIT 1 3/4 7-29 M IO

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'4^ e s,- a h s. 6 g lowew, he<% hpenbc amlauwn !;m;s n, nedu,;< j subters wl1ose sens,ny medanam is nor is une wiFA LAe Ioad pd are infeude) {o .us L lke I:4e of ike p h mary %+ and do nd L,n a spe ci+ied se rv;<< I;fe. 9 Mes c Fe be7t v!c.w Pe pitoneh 3 olFe h o' PcquiredfoPIkeff 'yfc.s o t Sbdhers. 3 95ef '. [.he rtig de benlan' accclernlion imi,L iny mecs anical subbm whose sens:ny sned u,m is not in line wiR, le f h muy loud f af b, clo not h ave a Efec;{ict) Jetvice ,:fe. fum.1f He sen:ce V(e is Meded b he 40 yean or

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1 b* , ~ ;' ~y f. r~ ;= s = ~ - - 4,---.. 8 i PLANT SYSTEMS O SURVEILL,.NCE REOUIREMENTS (Continued) f. Snubber Service Life Monitoring ('jIrecordoftheservicelife'ofeachsnubber,thedateatwhichthe designated service life commences and the installation and reaintenance records on which the designated service life is based shall be ..aintained as required by Specification 6.5.B.16. Concurrent with the first inservice visual inspection and at least once per 18 months thereafter, the installation and maintenance records for each snubber listed in. Tables 3.7.9-1 and 3.7.5-2 shall be reviewed to verify that the indicated service life has not been exceeded or will not be exceeded prior to the next scheduled snubber service life review. If the indicated service life will be exceeded prior to the next scheduled snubber service life review, the snubber service life shall be reevaluated or the snubber shall ~ be replaced or reconditioned so as to extend its service life beyond the date of the next scheduled service life review. This reevaluation, replacement or reconditioning shall be indicated in the records. O 4 {a? ' O ""P 1 1981 i c; LA -5ALLE - UNIT 1 3/4 7-30 l _ _ ~.

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