ML20058M760

Proposed Tech Specs Removing Spec 3/4.7.4 Re Snubbers,To Eliminate Redundant Requirements to Inservice Testing Program

ML20058M760
Person / Time
Site:	River Bend
Issue date:	08/03/1990
From:	GULF STATES UTILITIES CO.
To:
Shared Package
ML20058M759	List: ML20058M760 RBG-33339, Application for Amend to License NPF-47,removing Spec 3/4.7.4 Re Snubbers,To Eliminate Requirements to Inservice Testing Program
References
NUDOCS 9008130038
Download: ML20058M760 (8)

Text

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- PLANT SYSTEMS!

3/4.7.4 SNUBBERS' i LIMITING CONDITION FOR OPERATION 3.7.4 Al shall be OPERABLE. The only snubbers excluded from this requirement are those installed on nonsafety-related systems and then only if their failure or failure of-the system on whicn they are installed would have no adverse effect on any safety-related system.

APPLICA3ILITY: OPERATIONAL CONDITIONS 1, 2 and 3, and OPERATIONAL CONDITIONS 4-and 51'or snubbers located on systems required OPERABLE in those OPERATIONAL CONDITIONS. "

ACTION: .

S INSERT 2

'h- restore the n to OPERAB

! evaluation per Speci rm an engineering

... n nent or declare the i

noperable and follow the appropriate ACTION s at....... f;r +h t!

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SURVEILLANCE' REQUIREMENTS A

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' INSERT =fo wing augmented inservice inspection program and the requirements of-L B- Spect tion 4.0.5.

a , ,

a. Ins tion Types l

As used in is specification, type of snubber shall' mean snubbers of the same de n'and manufacturer, irrespective of capacity,

b. Visual Inspections

-Snubbers are categorized as cessible or accessible during reactor optration. Each.of these groups naccessible and accessible) may be inspected independently according the schedule below._ _The first inservice visual inspection of each typ f snubber shall be performed after 4 months but within 10 months of co ing POWER OPERATION

[ and shall include all snubbers. If all snubber f each type are found OPERABLE during the first inservice visual i ection, the

! second inservice visual inspection shall be performed the first refueling outage. Otherwise, subsequent visual inspectio shall be

!~- performed in accordance with the following schedule:

RIVER BEND - UNIT 1 3/4 7-10 9008130038 900803 PDR ADOCK 050004'3 p FD@u E_ ____ - - - - - -

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PtANT SYSTEMS SURVEIt. LANCE REOUIREMENTS Ho. vi invy r uis 5nuvv.r. vi 5vv. yw.n. n euei

\_. - Each Type per Inspection Period Inspection Period *#-

0 18 months t 25%-

1 12 months i 25% i 2 6 months 2 25% -

3, 4 124 days 2 25%

5,6,7 62 days 2 25%

8 or more 31 days 2 25%

c. Visual pection Acceptance Criteria U Visual insp tions shall verify that: (1) there are no visible indi- -

cations of.d age or impaired OPERASILITY and (2) attachments to the foundation or porting structure are OPERA 8LE, and (3) fasteners-for attachment o the snubber to the component and to the snubber anchorage are OPE BLE. Snubbers which appear inoperable as a result '!

of visual inspectio may be determined OPERABLE for the purpose of establishing the nex visual inspection interval,:provided that: 1 (1) the cause of the r ection is clearly established and remedied for that particular snu er and for other snubbers irrespective-of.  !

type on that system that y.be. generically susceptible; and (2) the_,

affected snubber is functio ally tested jn the as-found condition y .

and= determined OPERABLE per ecification 4.7.4.f.

- d. Transient-Event. Inspection -

i An inspection shall be performed o alll mechanical snubbers attached to sections of systems;that have exp ienced-unexpected, potentially

. damaging. transients, as determined fro a review of operational' data or a visual' inspection of the systems, thin 72 hours8.333333e-4 days <br />0.02 hours <br />1.190476e-4 weeks <br />2.7396e-5 months <br /> for accessible ,

areas and within 6 months for inaccessib1 areas, following this . deter-: 1 mination. In addition to satisfying.the y ual inspection acceptance 1

--criteria, freedom-of-motion of mechanical sn bars shall be verified using at least one of the following:. (1) man 11y induced, snubber movement; or (2) evaluation of in place snubber iston setting; or (3) stroking the mechanical snubber through its 11 range of travel.

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"The inspection interval for each type of snubber shall not be lengthene more

, than one step at a time. .

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PLANT SYSTEMS.

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[Y SURVEILLANCE REQUIREMENTS (Continued) 0 .' " =:t h .ct T;;t; During the first refueling ihutdown and at least once per 18 months thereafter during shutdown, d representative sample of snubbers shall be tested using one of the following sample plans for each type of ubber. The sample plan shall_be selected prior to the test period a

cannot be changed during the test period.' The NRC Regional _ Admin-ist tor shall be notified in writing,-prior to the test period, of the s le plan selected, or the sample plan used in the prior test period hall be implemented:

1.' At 1 st 10% of the total of each' type of snubber shall be func-tional tested either in place or in a bench test. For each snubber f:a type that does not meet the functional test accep-tance cri ria of Specification 4.7.4.f, an additional 10% of that type o snubber shall be functionally tested until no more failures are ound or until all snubbers of that type have been-functionally t ted; or

2. A representative sple of each type of snubber shall be function-ally-tested in acc dance with Figure 4.7.4-1. ." C" is the t'otal e number-of snubbers o a type found not meeting the acceptance-requirements of Speci cation 4.7.4.f. The cumulative number

.of snubbers of a type t ted 12 denoted by "N".. At the end of' each day's testing, the n w values of "N" and "C".(previous day's total p1us current day's i rements) shall be plotted on Figure ,4.7.4-1. If at any-.t the point plotted falls in-the-

" Reject" region all snubbers that type-shall be functionally tested. If at any time the poi plotted falls in the " Accept" region, testing of snubbers of th t type may be terminated.

When the point plotted lies in the " Continue Testing" region, additional snubbers of that type sha 1 be tested until the point falls in the " Accept" region or the " ject" region, or all the snubbers of that type have been tested; or

3. An initial representative sample of'55 snu ers shall be~ function-ally tested. For each snubber type which d s not meet the func-tional test acceptance criteria, another samp of at least one-half the size of the initial sample shall be t ted until the total number tested is equal to the initial samp size multipl.ied by the factor, 1 + C/2, where "C" is the number o snubbers found which do not meet the functional test acceptance er eria. The results from this sample plan shall be plotted using n " Accept" line which follows the equation N = 55(1 + C/2). Each nubber point should be plotted as soon as the snubber is teste If

, the point plotted falls on or below the " Accept" line, to ing of that type of snubber may be terminated. If the point p1 tted ,7,rA falls above the " Accept" line, testing must continue until t ,

point falls in the " Accept" region or all the snubbers of that ty;; i: r t::t:".

RIVER BEND - UNIT 1 3/4 7-12

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PLANT SYSTEMS'

. SURVEILLANCE REQUIREMENTS (Continued)

4. - ForeachTyp~eofsnubber,aninitialrepresentativesampleof 88 snubbers shall be functionally tested. Three snubbers- . -

of each type are allowed not' meeting the functional test accept-ance criteria. If the number of snubbers that failed the test is g.* eater than 3, an additional sample'of that type of snubber equal to 22(A-3) shall be functionally tested, where "A"-is the total number of snubbers failed during the functional test of the representative sat 'le; For each snubber that fa'iled during I

e functional test of th6 resample, an additional sample of.22-sn bbers of the same type shall be functionally tested. The-

-tes shall-continue until no more failures are found or until-all s ubbers of that type have been functionally tested. ,

Testing equip ent failure during functional testing may invalidate I that day's tes ng and allow that day's testing to resume anew at a. '

later time,'prov ding all snubbers tested with the failed equipment-during the day of quipment failure are retested. The representative . -,

sample selected for the. functional test sample plans shall be randomly-selected-from the sn bers of each type and reviewed before beginning the testing. The rey w shall ensure as far as practical that the -

' sample is representativ of thesvarious configurations l operating '

environments, range of s e,.and capacity of snubbers of each type.-

. Snubbers placed in the s locations as snubbers which failed the previous functional test sha 1 be retested at the' time of the nex.

functional: test but shall not e included in the sampleLplan. If, during the functional testing, dditiona'l sampling'is required due to-failure of only one type of snub r, the functional testing results l shall be reviewed at the time to- termine if additional samples should be limited to the type of'sn ber which has failed the func-tional testing. l

f. Functional Test Acceptance CriteM a c

l ~The snubber functional test shall verify t t: 1 L

L 1. Activation-(restraining action) is achie d within the specified )

range in both tension and compres:, ion; q l

y; 2. . For mechanical snubbers, the force required t initiate or main- J

'tain motion of the snubber is within the speci ed range in both l directions of travel; and 1

3. For snubbers specifically required not to displace der contin-uous load, the ability of the snubber to withstand 1 d without displacement. .

l Testing methods may be used to measure parameters indirectly o para- l

. - meters other than those specified if those results can be corre ted (

to the specified parameters through established methods. '

j. RIVER BEND - UNIT 1 3/4 7-13 l

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PLANT SYSTEMS SURVEILLANCE REQUIREMENTS (Continued) ,

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g. Functional Test Failure Analysis An-engineering evaluation shall be made of each failure to meet the l'

~i functional test acceptance criteria to determine the cause of the-failure. The results of this evaluation shall be used..if applicable, n selecting snubbers to be tested.in an effort to determine:the -

t'/ - 0 RABILITY of other snubbers, irrespective of type, which may be L. sub ct to the same failure mode. 1 For th snubbers found. inoperable, an engineering evaluation shall 1

- be perfo d on the components to which the inoperable snubbers are .

attached.- The purpose of this engineering evaluation shall be to '

determine-i the components to which the inoperable snubbers-are l attached were dversely affected by the inoperability of the snubbers, a in order to ens re that the component remains capable of meeting;the designed service. '

If any snubber sale ed for functional testing either fails to lock

. up or fails to move, e., frozen-in place, the cause will be eval-usted and if caused by nufacturer or design deficiency', all snubbers of the same-type subject. the same defect shall be functionally tested. This testing requ ement shall be_ independent of the require; ,

ments-stated in Specificatio 4.7.4.e for snubbers not meeting-the

. functional' test acceptance er eria. 1

-h. Functional Testino of R'epaire'd an Reolaced Snubbers .,

Snubbers that fail the visual inspec on or the functional test acceptance criteria shall be-repaired replaced. Replacement snubbers ~and snubbers that have' repairs hat might affect the func-tional test' result shall be tested to mee the functional test .

L criteria before installation in the unit. chanical snubbers shall- l l3 have met the acceptance criteria subsequent t their most recent service, and the freedom-of-motion-test must h e been performed-within 12 months from the time the snubber was i talled in the unit, n :l L

1. Snubber Service Life Procram 1 The ' service life of all snubbers shall be conitored to nsure that

'w the service life is not exceeded between surveillance in actions.

The maximum expected service life for various critical par shall be determined'and established based on engineering information nd shall l be extended or shortened based on monitored test results and ilure-history. Critical parts shall be replaced so that the maximum ervice- '

H life will not be exceeded during a period when ~ the snubber is re ired to be OPERABLE. The parts replacements shall be documented and th -l documentation shall be retained in accordance with Specification 6. .N ,

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ACCEPT 1

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0 10- 20 30 40 50 60 70 80 go- 100 1

N SAMPLE PLAN FO SNUBBER FUNCTIONAL TEST RIVER BEND - UNIT 1 3/4 7-15

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PLANT SYSTEMS.

, BASES-

4 REACTOR CORE ISOLATION COOLING SYSTEM (Continued)

The surveillance requirements provide adequate assurance that RCIC will

-be'0PERABLE'when required. Although all active components are testable and full flow can be demonstrated by recirculation during reactor operation, a i:omplete functional test requires reactor shutdown. The pump discharge piping is maintained earliest possible fullmoment.

to prevent water hammer damage and to start cooling at the J

3/4.7.4 SNUBBERS

.All snubbers are required OPERA 8LE to ensure that the-structural integrity of the reactor coolant system and all other safety related systems is maintained during and following a seismic or other event that initiates dynamic loads.

si D.dt r; an. ,; h,h;;if WO-kip,h d =4 andgr;;;;d 100-kip5capacity mechmair '. .uuocer,;s3 d;;ign and so;f;;;g utilizing the'same design renun.; r~' ==nuf=at .a oy company "A" are of the _

same type. The same desian -^r5...;6.i snubTeri .,;; m by Company "B" would be of = dii;' r.nt type, for the purposes of this Techn ca

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INSERT C .

A list of' individual snubber led information of snubber loca-tion, size and system affected shal) be h:fidh :t th: phat.

bility of each snubber *h*1' he d-*e-f red end r;;r:v:d bj- th:" . The accessi-9^a=i++==

n i ' ' t3 a nk

he det:- in:th shall be based upon the accessibility of the snubber d0 ring plant operations (e.g., radiation level, temperature, atmosphere, f location, etc.) .The addition or deletion of.any hydraulic or mechanical snubber T

-shall be made in accordance with Section 50.59 of 10 CFR Part 50.

.When a snubber is found inoperable, an engineering evaluation is performe),

' including the determination of the snubber mode.of failure, in order to deter-mine if any safety-related component or system has been adversely.affected by the inoperability of the snubber. ' The engineering evaluation shall determine whether or not the snubber mode of failure has imparted a significant'effect or degradation on the supported component or system.

To provide further assurance of snubber reliability, a representative sample of the installed snubbers will be functionally tested, during plant shutdowns, at 18' month intervals. Shethe Of : 7:;rt::nt:ti": r ph !!!:ri

' i n;; t: ::: :" th: ' r r; h p u n; prnide; es; w ene. that the en.hte.; in p u nt .;ill be ^^:^a t

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ithin ec eptance li ;;;. Observed failures of these sample snubbers will require functional testing of additional units.

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The service life of a-snubber is evaluatedlfr- ::nuf::tur:r ing;; = I tinn an,4c^n:ider 4n+.... tten of th; = d i,x : n; h; a nt u,ur,;

. .... 2. . . .. . i . . s m - ,o en ;;;ee- kt;d in;,;i k-m n.4 n,. s

..,n 1. . . . ._a .~ '4 [k U. u.C.. 3..s. .IE.5 21.. ' .U, I.I,I,," C,,, , 'I,,',, N,,,,", . .n .' I.E. ..I ' Y.I b Y $  %

in accoroartce with the Service Life Monitoring Plan in the ISI Prog RIVER BEND - UNIT 1 B 3/4 7-2 .

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. PLANT SYSTEMS i sk. BASES SNUB 8ERS (Continued)

.that the snubbers periodically undergo a performance evaluation in view of their age and operating conditions. These records will provide statistical

. bases for future consideration of snubber service _ life. The requirements for

'the maintenance of records and of the snubber service life-review are not ' -

intended-to affect plant. operation.

3/4.7.5 SEALED SOURCE CONTAMINATION The limitations on removable contamination for sources requiring leak testing, including alpha emitters, is based on 10 CFR 70.39(c) limits for-plutonium. This limitation will ensure that-leakage from byproduct,; source, and special= nuclear material sources will not exceed allowable intake values.

. Sealed sources are classified into three groups according to their use, with, surveillance requirements commensurate with the probability of damage to a so' tree in that group. Those sources which are frequently handled =are required to be tested more often than those which are not. Sealed sources-which are

, continuously enclosed within a shielded mechanism, i.e., sealed-sources within radiation monitoring devices, are considered.to be stored and need not be; tested unless they are temoved from the shielded mechanism. -

3/4 7.6 FIRE SUPPRESSION SYSTEMS T$eOPERABILITYofthefiresuppressionsystemsensuresthatadequate

. fire suppression capability is available to confine and extinguish fires occurring in any portion of. the facility where safety related equipment 'is located. The fire suppression. systems consist of the water system, spray-

. and/or sprinkler systems, Halon system and fire hose stations. The collective capability ofLthe fire suppression systems is adequate to minimize potential e damage to safety related equipment and is a majo element in the. facility fire protection program.

It, Une event that portions of the fire suppression systems are inoperable, alternate backup fire fighting equipment is required to be made available in the affected areas until the inoperable equipment is restored to service. When the inoperable fire fighting equipment is intended fer use as a backup means of fire suppression, a longer period of time-is allowed to provide!an alternate-means of fire fighting than if the inoperable equipment is the primary means

of fire suppression.

The surveillance requirements provide assurance that the minimum OPERABILITY requirements of the fire suppression' systems are met. An allowance is made for ensuring a sufficient volume of Halon in the Halon

, storage tanks by verifying the weight and pressure of the tanks.

In the event the fire suppression water system becomes inoperable, immediate corrective measures must be taken since this system provides the major fire suppression capability of the plant.

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RIVER BEND - UNIT 1 B 3/4 7-3 I

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