ML20073Q822

Proposed Tech Specs Re Limiting Condition for Operation & Surveillance Requirements for Visual Insp of Snubbers

ML20073Q822
Person / Time
Site:	Calvert Cliffs
Issue date:	05/24/1991
From:	BALTIMORE GAS & ELECTRIC CO.
To:
Shared Package
ML20073Q820	List: ML20073Q819 ML20073Q822
References
NUDOCS 9106040010
Download: ML20073Q822 (16)

Text

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A'ITACliMENT A UNIT I RINISED TECllNICAL SPECIFICATION PAGES 3/4725 3/4 7 26c 3/4 7 26d 113/475 l

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9106040010 910524 i

PDR ADOCK 05000317 l p PDR l-

PL AW SYST D'.5 3 /o.).O ShuisERS LIMITING C0tDITION FOR OPERATION 3.7.8.1 All safety related snubbers l shall be OPERABLE. .

APPLICABILITY: MDES 1, 2, 3 and 4 (t10 DES 5 and 6 fer ubbers located on systems required OPERABLE in those MODE A

ACTION:

eb '

'dith one or more snubbers inoperable, within 72 hours8.333333e-4 days <br />0.02 hours <br />1.190476e-4 weeks <br />2.7396e-5 months <br /> replace or restore the inoperable snubber (s) to OPERABLE status, and perform an engineering -:valua.

tion

• per Specification 4.7.8 b and c on the supportQ component or declare the supported system inoperab e and follow the appropriate ACTION statement for that system.

.1.

_ SURVEILLANCE REQUIREMEt(T5 n_ a.Am n to) 4.7.8.1 Each snubber shall be deconstrated OPERABt E y performance cf the '

following augmented inservice inspection program the requiremerr.s of Specification 4.0.5. As used in this Specification, type of snubber shall mean snubbees of the same design and manufacturer, irrespe:tive of capacity.

a. Visual inspections Visual inspecticns 3 hall be performed in acevdance with the _m Ecl : c, ' n-J s che dul de Ferrained by 7' lolg j. 7-KtJJ.s'Ef T@)

f No Inoperable Snubeets'of Subsyqtfent Visual"

_EM Type oer Inspect' ion Period Instection Periodf /

l ...' 0' 18 months 12/

y' 1 12 months . 5t

/, ,,,2 ,-

6 mont . + 25.

,! ,,/ 3, 4 [] 124 d s 1 25t f

/ 5,6,7

[ 6 ays 25'. /

/,,. , The snubbers 8 or . re 1 days 1 25 be further categer ed into two groups: nose

'/ accessibi group nd those inaccessibt during reactor opera on. Each be inspected indep wently in accordance wj'th the above ,

sch ule. ,/

t -

1 Safety related snubbers include those snubbers installed on safety related j systems and snubbers on non-safety related systems if their f ailure or the l

failure of the system on which they are installed would have an adverse I

effect on any safety related system.

A documented, visual inspection shall be sufficient to meet the requirements for an engineering evaluation. Additional a talyses, as needed, shall be completed in a reasonable period of tir.;e.

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CALVERT CLIFF 5 - UNIT 1 3/4 7-25 teendnent No. 5//JJE///f3

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s INSERT "A"-(for TECH SPEC 3/4.7.8.1.a)

Snubbers as are categorized inaccessible or accessible during reactor operation. Each of these categories (inaccessible and accessible) may be inspec'ed independently or jointly according to the schedule determined by Table l 4.7-3. The visual inspection interval for each population or category of snubbers shall be determined based upon the criteria provided in Table 4.7-3 and the first inspection interval determined.using this criteria shall be based upon the previous inspection interval as- established by the requirements in~effect before amendment (*).

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• NRC will include the number of the license amendment that implements this. change.

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TABLE 4.7 #

SNUBBER Y!SUAL INSPECTION INTERYAL__

,F%MOFEthELE e MLMBER OF, z _ ___- ._ $ NUB 8ERS Population Columo A Colimna 5 --- Colori C or Category Extend Interval Repeat Interval _ Reduce Intkrval (Notes I and 2) (Notas 3 and 6) (Notas 4 and 6) (Notes 5 and 6) 1 0 0 1

.. _ . . _8. 0_ . . . .. __..0..._. .

0 2

100 0 1 4 150 . 0 3 8 .

200 2 ,

5 13 .

300 5 -

12 25 400 8 18 DS 500 12 24 48 750 20 . 40 78 1000 or greater 29 56 109 1

1 l

cJu. VERT CLIFFS - UNIT .t 3/4 7-26 c AmenJuant Mo.

Te tE C3 (C o n:. .dh j 7"ALLC NOTA Tlo A) f**PerhD Mota 1: The next visual inspection interval for a snubber population or cate-gory size shall be determined based upon the preYious inspection l interval and the number of t - rr zed, ^ :a snubbers found during that interval. Snubbers may be categor based upon their accessibility during power operation, as accessible or inaccessible. These categor-1es may be examined separately or jointly. However, the licensee must make and document that decision before any inspection and shall use that decision as the basis upon which to determine the next l inspection interval for that category.

Mote 2: Interpolation between population or category sizes and the number of 1 snubbers is permissible. Use next lower integer for the \

hoperAU va ue o limit for Columns A, 5, or C if that integer includes a fractional value o snubbers as determined by inter- l polation. rd Note 3: If the number of 2 :r:bf slubbers is equal to or less than the l number in Column A, the ne.xt inspection interval r,ay be twice the previous interval but not_ creater than 48 months. _

Note 4: If the number of(1seperMe'-- .d snubbers is equal to or less than the '

l number in Column B but greater that the nu=ber in Colu=n A, the next inspection interval shall be, the same as the previous interval._

C neperA W 7 of Go rret

-"p erble}t snubbers is equal to or gretter than th Note 5: If the nu=ber l nu=ber in Column C, the fiext inspection interval shall be two-thirds]e of the previous interval. However, i f the number of Nx;r_^ :- r- l snubbers is less than the nu=ber in Column C but greater tun the nu=ber in Column B, the next interval st}all be reduced proportionally by interpolation, that is, the previous interval shall be reduced by a factor that is one-third of the ratio of the difference between the number of M r:: -9 snubbers found during the previous interval and l the number in column B to the difference in the numbers in Columns B' and C. gg,{g Note 6: The provisions of Specification 4.0.2 are applicable for all inspec-

, tion intervals up to and inclucing 48 months.

caveu cum - m i 1 m% %gg

' PLANT SYSTEMS BASES _ _ _ . _ .

environment. The operation of this system and the resultant effects on offsite dosage calculations was assumed in the accident analyses.

3/4.7.8 SNUBBERS All safety related snubbers are required OPERABLE to ensure that the structural l integrity of the reactor coolant system and all other safety related systems is maintained during and following a seismic or other event initiating dynamic loads.

Snubbers excluded from this inspection program are those installed on non-safety related systems and then only if their failure or failure of the system on which they are installed would have no adverse effect on any safety-related system.

The visual inspe t on frequency is based upon maintaining a constant level of g p i snubber protection to systems. . Therefore, the required inspection interval varies 1 ' inversely with the observed snubber failures and is determined by the number of

% nce nt to e er n

% the next inspection. However, the results of such early inspections performed before the original required time interval has elapsed (nominal time less 25t) may not be used to lengthen the required inspection interval. Any inspection whose results require a shorter inspection interval will override the previous schedule.

When the cause of the rejection of a snubber is clearly established and remedied for that . snubber and for any other snubbers that may be generically susceptible, and verified by inservice functional testing, that snubber may be exempted from being counted as inoperable. Genericall are (1) of a specific make or model, (2)y susceptible snubbers are those whichof the located or exposed to the same environmental conditions such as temperature, radiation, and vibration. These characteristics of the snubber installation shall be evaluated to determine if further functional testing of similar snubber

p. installations is warranted.

5h PWhen a snubber is found inoperable, an engineering evaluation fs performed, in sq I addition to the determination of the snubber mode of failure, in order to deter-I4 mine if any safety-related component or system has been adversely affected by the I

h inoperability of the snubber. The engineering evaluation shall determine whether or not the snubber mode of failure has imparted a_ sinnif_icant effect or degrada-tion on the supported component or system.M.rd5(Ar O ITo provide assurance of snubber functional reliability, a representative sample ,

of the installed snubbers of each type

• will be functionally. tested during plant shutdowns at 18 month intervals. Observed failures of these sample snubbers shall require functional testing of additional units.

The service life of a snubber is evaluated via manufacturer input and information through consideration of the snubber service conditions and associated installa-tion and maintenance records (newly installed snubber, seal replaced, spring replaced, in high radiation area, in high tempera ture area , etc. . . . ) . The requirement to monitor the snubber service life is included to ensure that the l

• 5 mall bore Q8") and large bore (>8") hydraulic snubbers are examples of different types of snubbe s.

CALVERT CLIFFS - UNIT 1 B 3/4 7-5 Amendment No. 6/ ,))E /h

4 INSERT "B" (for BASES 3/4.7.8) inoperable snubbers found during the previous inspection, the total population or category size, and the previous inspection interval.

Snubbers may be categorized, based upon their accessibility during power operation, as accessible or inaccessible. These categories may be examined separately or jointly. However, that decision must be made and documented before any inspection and that decision shall be used as the basis upon which to determine the next inspection interval for that category.

INSERT "C" (for BASES 3/4.7.8)

A snubber is considered inoperable if it fails to satisfy the acceptance criteria of the visual inspection.

INSERT "D" (for BASES 3/4.7.8) operation may continue indefinitely if an engineering review and evaluation can document within 72 hours8.333333e-4 days <br />0.02 hours <br />1.190476e-4 weeks <br />2.7396e-5 months <br /> that the equipment connected to the snubber can contir.ue to perform its required function (s) with the snubber inoperable. If the review and evaluation can not justify that the supported equipment will perform its required function (s), the equipment must be declared inoperable and the applicable action requirements met.

The Specification allows inspection intervals to be compatible with a 24 month fuel cycle, up to and including an increase to every other refueling outage.

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AlTACliMENTIl 1 i

l UNIT 2 RlWISED TECIINICAL SI'ECIFICATION l' AGES 3/4725 3/4 7 26c 3/4 7-26d 113/475 e

, PLANT.SYSTLy

[ 3/4.7.8 - SNUbdERS

. LIMITING CONDI110N FOR OPERATION 3.7.3.1 All safety rslated snubbers l shall be OPERABLE.

APPLICASILITY: It00ES 1, 2, 3 and 4. . (MODES 5 and 6 for snubbers located on systems required OPERABLE in those MODES.)

ACTION:

With one or ecre snubbers inoperable, within 72 hours8.333333e-4 days <br />0.02 hours <br />1.190476e-4 weeks <br />2.7396e-5 months <br /> replace or restore the inoperable snubber (s) .to OPERABLE status, and perform an engineerino evalua-tion

• per Specification 4.7.8.1.b and c on the supported component or dec.lare et supported system inoperable and follow the appropriate ACTION statement for that system.

SURYEILLMCE REQUIREMENTS w .uw k J 4.7.8.1 Each snubber shall be demonstrated OPE by performaWee of *Jm following augmented inservice inspection program the requirements of Specification 4.0.5. As used in this Specification, type of snubber shall mean snubbers of the same design and manufacturer, irrespective of capacity.

a. Visual Insoections Visual inspections shall be cerfomtd in accordanen wihh the_

schedula$ dekrmied % bic 4.'l-QTtIM5n7@)

f no. Anoperaole anucoers of./ auosequent Y1sual" T Each .The oer Inscection Period Inscection Peri

.' O / ' 18 months + 5:

, 1/ 12 month y,25t V 6 mon *hs + 25:

b /3, 4 124 s 75: ,

5,6,7 5 days :+ 25: -

8 or more 1 days 1_ 25%

l The snu ers may be fur

• categorized o two groups: e i acces ble and those i ccessible dur reactor operatio . Each g may be inspec independent 1 in accordance with e above adule.

1 Safety related snubbers include those snubbers installed on safety related systems and snubbers on non-safety related systems if their failure or the failure of the system on which they are installed would have an adverse effect on any safety related system.

A doci.rnented, Visual inspection shall be sufficient to meet the requirements for an engineering evaluation. Additional analyses, as needed, shall be comoleted in a reasonable period of time. -

l b TLs  !.. pe.i w. in a..ol d ell o v. i; 1;ni; O ened - 0 ;n ; ; it;;$ et ; t' [

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CALVERT CLIFFS - UNIT 2 3/4 7-25 AmendmentNo.75AJ//pp/MS/

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INSERT "A" (for TECH SPEC 3/4.7.8.1.a)

Snubbers are categorized as inaccessible or accessible during' reactor- operation. Each of these categories (inaccessible and accessible) may be inspected independently or jointly _ according- to the schedule determined by Table 4.7-3.- The-visual inspection interval for each population or category of snubbers shall be determined based upon the criteria provided in Table - 4.7-3 and the first -inspection interval determined using this criteria shall be based upon the previous inspection interval as established by the requirements in.effect before amendment (*).

!

• NRC will include the number of the license amendment that implements this change.

u_- .--------- -. ---___ ___-__ __ - --...-v--- . - . . . - , . - - - - y --r -- ~ v- ,~.

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TA8 4.7-5 i i

SNUB 5ER VISUA1. INSPECTION INTERVAL _ ,

i fZN6MRAstl '

RMBER OF J 1"M7??'_"_98UE8ERS Population Column A Columm 8- Column C or Category Extend Interval Repeat Interval Reduce Intirval  !

(Notes 1 and 2) (Notas 3 and 6) (Notas 4 and 5) (Notes 5 and 6)  !

1 0 0 1 i I

2

- -...-.0....

8

.. -. - 0..

0 . . _ .

100 O 1 4

~

150 . O 3 8 .

200 2 ,

5 13 .

300 5 ,

12 25

. i i

400 8 18 36 500 12 24 48 750 20 . 40 78 1000 or greater 29 56 109 I

CA1. VERT CLIFF.5 - UNIT 4. 3/4 7-26 c Amed=ed Mo.

rAstE 4,7-3 (C c & m ed 1

\'.

-rA LLC NC TA Y10 A) l Note 1: The next visual inspection interval for a snubber population or cate-gory size shall be determined based upon the previous inspection interval and the number of t_:xx:^ w snubbers found during that l interval. Snubbers may be categorized, based upon theirThese accessibility categor-during power operation, as accessible or inaccessible.

ies may be examined separately or jointly. However, the licensee must make and document that decision before aay inspection and shall use that decision as the basis upon which to c'etermine the next inspection interval for that catescry.

_ Note 2: Interpolation betwen population or category sizes and the number of Use next lower intepr for the l 9ngera\C d r x:::n msnubbers is permissible.

value oV the limit for Columns A, B, or C if that integer includes a fractional value of snubbers as determined by inter- l polation, ggg Note 3: If the number of r  :::T a snubbers is equal to or less than the l number in Colu:nn A, the next inspection ir.terval may be twict the previous interval but_not greater than 48 months.

Note 4: If the nurber of -

1 snubbers is equal to or less than the I number in Column B but irtater that the nu=ber in Colu=n A, the next inspection interval shall_ be, the sare as the previous interval.

COpehW '

Note 5: If the nu:nber ofL ,.p;estfQ_ u=_i snubbers is equal to or greater than l the number in Colu=n C, the next inspection interval shall be tw-thirds j of the previous interval. However, if the nu=ber of _ .1 ::_ _ .y (

snubbers is less than the nu=ber in Column C but greater than trie nu=ber in Colu=n B, the next interval shall be reduced propor-tionally by interpolation, that is, the previous interval shall be reduced by a factor that is one-third of the ratio of the difference between the number of ; M snubbers found during the previous interval and \

the nu=ber D.umn_ B_ to the difference in the nu=bers in Columns B and C.

4 Note 6: The provisions of Specification 4.0.2 are applicable for all inspec-

, tion intervals up to and including 4,8 renths. , , , , , , , , _ _ _

CALVERJr ctgp3 - !!UIT :L 3/4 7-16 A-e & cd No,

~. -- .. -. -- . - . - - -_- ___--_- .- __ _ _ - _ - -- -

PLANT SYSTDi!,

j BASES environment. The operg'4n of this system and the resultant effects on offsite dosage calculations wat m med in the accident analyses. .

l 3/4.7.8 $NUBBERS l All safety related snubbers are required OPERABLE to ensure that the structural l integrity of the reactor coolant system and all other safety related systems is maintained during and following a seismic nr other event initiating dynamic loads.

Snubbers excluded from this inspectica program are those installed on non-safety related syttems end then only if their failure or failure of the system on which they are instal, led would have no adverse effect on any pafety-related system.

,gh The visual inspection frequency is based upon maintaining a c'onstant level of

., gi snubber protection to systems. Therefore, the required inspection interval varies he inversely with the obser ved snubber failures and is detennined by the number of w 6 . #. _ _ 2;; ------m_ ,__ : r_g n: -r ';::::r =3 Inspections performed 31 'before that interval has elapsed may be used as a new reference point to determine r1 the next insplcttor. However, the results of such early inspections performed before the original required time interval has elepsed (nominal time less 25%) may not be used to lengthen the required inspection interval. Any inspection whose results require a shorter inspection interval will override the previous schedule.

When the cause of the rejection of a snubber is clearly established and. remedied for that snubber and for any other snubbers that may be generically susceptible, and verified by inservice functional testing, that snubber may be exempted from being counted as inoperable. Generically susceptible snubbers are those which are (1) of a specific make or mooel, (2) of the same design, and (3) similarly (Q located or exposed to the same environmental conoitions such as temperature, j radiation, and vibratien. These characteristics of the snubber installation

,b i shall be evaluated to determine if further functional testing of similar snubber g installations is warranted.

$, @When a saubber is found inoperable, an engineering evaluation is performed, in

' I addition to the determination of the snutber mode of failure, in order to deter-l mine if any safety-related component or system has been adversely affected by the l inoperability of the snubber. The enginee' ring evaluation shall detennine whether or not the snubber mode of failure has imparted a signif_icant effect or degrada-tion on the supported component or system.gg Q l 4 To provide assurance of snubber functional.. reliability .a representative, sample , j l of the installed snubbers of each type' will be functionally tested du' ring plant I shutdowns at 18 month intervals. Observed failures of these sample snubbers shall require-functional testing of additional units. .

The service life of a snubber is evaluated via manufacturer input and information through consideration of the snubber service conditions and associated installa-tion and maintenance records (newly installed snubber, seal replaced, spring replaced, in high radiation area, in high tempera ture a rea , etc . . . . ) . The requirement to monitor the saubber service life is included to ensure that the

<8"

'Str.all different bore ty (Fes)of snubbers.and large bore (>8") hydraulic snubbers are examples o CALVERT Cliff 5 - UNIT 2 B 3/4 7-5 Amer.dment No. O . S',.

e +

4 4

INSERT "B" (for BASES 3/4.7.8) i l

inoperable snubbers found during the previous inspection, the total population or category size, and the previous inspection interval.

Snubbers may be categorized, based upon their accessibility #

during power operation, as accessible or inaccessible.. These categories may be examined separately or jointly. However, that decision must be made and documented before any inspection and that decision shall be used as the basis upon which to determine the next inspection interval for that category.

INSERT "C" (for BASES 3/4.7.8)

- A snubber is considered- inoperable if it fails to - satisfy the acceptance criteria of the visual inspection.

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4.

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. 1 INSERT "D" (for BASI:S 3/4.7.8) operation may continue indefinitely if an engincoring review and evaluation can document within 72 hours that the equipment connected to the snubber can continue to perform its required function (s) with the snubber inoperable. If the review and evaluation can not justify that the supported equipment will perform its required function (s), the equipment must be declared inoperable and the applicable action requirements inet.

The Specification allows inspection intervals to be compatibic with a 24 inonth fuel cycle, up to and including an increase to every other refueling outage.

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