ML20077L532
| ML20077L532 | |
| Person / Time | |
|---|---|
| Site: | Limerick  |
| Issue date: | 08/01/1991 |
| From: | Office of Nuclear Reactor Regulation |
| To: | |
| Shared Package | |
| ML20077L537 | List: |
| References | |
| GL-90-09, GL-90-9, NUDOCS 9108120324 | |
| Download: ML20077L532 (9) | |
Text
PLANT SYST(T, 3/4.7.4 SNUBGERS LIMITING CONDITION FOR OPERATION
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K 3.7.4 All snubbers shall be OPE MBLE.
APPLICA61LITY: OPERA 110NAL CON 0ill0NS 1, 2, and 3.
OPERAfl0hAL CONDil!0NS 4 and
$~for snubbers loceted on systems required OPEU.BLE in those OPERAT10ML CONDITIONS.
OJ ACTION:
With one or more snubbers inoperable on any system, within 72 hcurs replace or restore the inoperabh sr.obber(s) to OPiRADLE status and perform an engineering evaluation per S.oecification 4.7.4g on the attached comp:$ent or declare the ate.ched system inoperaole and fcilow the appropriate ACTION stntement for that P
- system, i-7 SURVEILLANCE REQUIREMENTS C
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K 4.7.4 Each snubber shall t'e demonstratt.d OPERABLE by performante of the following augmented inservict inspection prcgram and the reauirements ')t Specification 4.0.5.
a.
Inspection Types As used in this specification, type Of snuoher sliall mean snubbers of the same design and manufacturer, irrespective of c.:Dacity, r
b.
Visual inspections p
Snubbers cre categori?ed as inaccessibie or accessiMe during reactor E
operation.
Each of the".c categcries (incccessit,le and acces:iible) may be 1
inspected independently according to the schedule determined by Table 4.7.4-1.
The visual inspection interval for each type of snebber sr.all t'e datermined bcsed upon the criteia provided in fable 4.1.4-1 and the e
first inspection interval determined using this criterio shall l'e bcaed l
upon the previous inspection inteq &i as estelished by the requirements in effect before amendment no. 51.
LlHERICK - UNIT 1 3/a 7-11 Amendme'at No. 51 o10012033 m10001 6DR ADOCK 050003S2 p
t TA9LE 4.7.4 1 SNUBBER VISUAL INSPECTION INTERVAL NUMBER OF (1NACCEPTABLE $NU68ERS 49ulation Cola n A Column 8 Column C or Cacegory C.. tend Interval Repeat Interval Reduce trterval (Nntes I ond 2)
(Notes 3 and 6)
(Notes 4 and 6)
(Notes 5 and 6) 1 0
0 1
60 0
0 2
100 0
t 4
150 0
3 8
200 2
5 13 iG3 5
12 25 400 8
18 36 500 12 24 48 150 20 40 78 1000 or greater 29 56 109 Note 1:
lhe next visual inspection interv41 for a snubber population or category size shall be determined based upon the previous inspection interval and the number of unacceptable snubb2rs founo during that interval. Snuboers may be categorized, based upon tha')
accessibility during power operation, as accessible or ;nuccessible.
l These cattrgeries may be examined separately or jointly Hocever, 1
the liceMee must make ar4 document tht! decision.before My l
inspection and shall use that decision as the ba:10 upon etich to determine t.he next in section intervil for that category.
Note 2:
Interpolation between population or category 112es and the NEer of unecceptable snubbers is permissible. Use next lower integer for the value of the limit for Columns A, 8, or C if that integer includM a fractional value of unacceptable snubbers as determined by interpolation.
Note 3:
If the number of unacceptable snubbers is equal to or less than the number in Column A, the next inspection interval may be twice the provicus interval but not greater than 48 months.
Note 4:
If the number of unacceptable inubbers is equal to or less than the I
number in Column 8 but greater than the number in Column A. the next inspection interval shall be tne same as the previous interval.
lJ LIMERICX - UNIT 1 3/4 7-114 Amendment No. 51 l
i TABLE 4.7.4-1 (continued) 54UBBER VISUAL INSPECTION INTERVAL k
i Hote 5:
If the number of unacceptable snubbers is equal to or greater then the number in Column C, the next inspection intervt.1 shall 50 two-thirds of the previous interval. However, if the tweber of unacceptable snubbers is less than the number in Column C but greater than the n:Jmber in Column B, the next interval shall be reduced proportionally by inttrrpolation, that is, the previous intervai shall be reduced by a factor that is one-third of the ratio of the difference between the number of unacceptable snubbers found during the crevious interval and the number in Column B to the difference in the numbers in Columns 6 and C.
i Note 6:
The provisions of Specificat'.on 4.0.2 are applicable for all inspection intervals up to and including 48 months, a
LIMERICK - UNIT 1 3/4 7-11b Amendment No. 51
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ptANT SYSTEMS SullVEILLANCE REQUIREMENTS (Contirmed)
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Visual Inspection Acceptance Criterie, Visual inspections shall verify (1) that there are no visible indications of damagt or impaired OPERABILITY, (2) attachments to the foundation or
. supporting structure are secure,-and (3) fasteners for attachment of the snubber to the component and to the snubber anchorage are secure.
Snubbers which appear Inoperable as a result of visual inspections shall be classified 4s unacceptable and may be reclassified acceptable for the purpose of establishing the next visual inspection interval, providing that:-(1) the cause of the rejection is clearly estahlished and remedied for that:ptrticular snubber and for other snubbers' irrespective of type on that system that may be generically susceptiblet and/or (2) the
-affacted snuboer is'functinnally tasted in the as found condition and-determined OPERABLE per Specifications 4.7.4f, For those. snubbers common to more than one system, the OPERA 81LiTY of such s mbbers shall be considered in-assessing the survatilance schedule for each of the related systems.
A review and evaluation shall be performed and documented to
. justify continued operation with an unacctptable snubber.
If continued operation cannot be justified, the snubber shall be declared inoperable and the ACTIONS requirements shall be met.
d..
. Transient Event Inspection An inspection shall:be performed of all, snubbers attachtd te' sections of systems that have experienced unexpected, potentially damsging transients, as determined from a: review of operation 41' data or a visual-inspection of the systems',-within.72 hours8.333333e-4 days <br />0.02 hours <br />1.190476e-4 weeks <br />2.7396e-5 months <br /> for accessible systems and~6 months for inaccessible syttees following this determination.
In
. addition _to satisfying tne visual inspection acceptance criteria.
- freedom-of-ontion of mechanical snubbers shall et verified using at least one of the follcwing: -(1)-manually.inducedsnubbermovement;or(2) evaluattoa of in-place snubber piston setting; or 3) stroking the mechanical snubber through its full range of trave.
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i LIMERICK - UNIT i 3/4 7-12 Amendment No. 51 s
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' PLANT SYSTEMS-i
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.J/4.7.4-SNUBBER LIMITiHG CONDITION FOR OPERATION.
3.7.4-All snubbers shall be OPERABLE.
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-APPLICABILITY: - OPERATIONAL CONDITIONS 1, 2, and 3.
OPERAT10NAL CONDITIONS 4-end T 7or snubbers located on systems required OPERA 3tE in those OPERATIONAL CONDITIONS -
f-
-ACTION:
With one or more snubbers inoperable on any system,'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 pe, form an engineering evaluation per Specification _4.7.4g on the attached component or declare the--
-attached system inoperable and_ follow the appropriate ACTION statement for that system.
. SURVEILLANCE REQUIREPENTS 4 7.4'-
.=Each snubber shall be demonstrated 0FERABLE by performance of the following eugmented inservice inspection program and the requirements of Specification 4;0.5.
-a,
-Inspection-Types-As used in this specification, type of snubber shall mean snubbers of the same design and manufacturer, irrespective of ccpacity.
E b;-. Visual-Inspections Snubbers are categorized as. inaccessible or accessible during reactor u peration.. Each.of: these. categories (inaccessible and accessible) ma.y be o
-inspected independently =according to the schedule'_ determined by Table 4.7.4-l - The visual inspection interval _for each type of snubber-shall ik be determined based upon the criteria provided in. Table 4;7'.4-1 and the i.
=first inspection. interval determined using this criteria shall be based L
upon-the previous inspectlon' interval-as established:by the requirements-b
_ in effect before. amendment no.15.
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.LIHERICK - UNIT 2 3/4 7-11 Ame.ndment No. f. ;15 L
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s TABLR 4,7,4 1-SNU68ER VISDTL INSPECTIUN INTERVAL' HUMBER OF UNACCEPTABLE SNU88ERS Population Coluan A Column 8 Column C or Category Extend Interval Repeat Intervai Reduce Interval
-(Notes 1 and 2)
(Notes 3 aad 6)
(Netts 4 and 6)
(Notes 5 and 6) 1 0
0 1
80 0
0 2
100 0
1 4
150 0
3 a
200 2
5 13 300 5
12 25 400 8
18 36 500 12 24 48 750 20 40 78 t.000 or grtater 29
- i6 109
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Note 1; The next visual inspection interval for a snu3ber population or-category si2e shall be determined based upon the previous inspection
- 8 interval and the number of unacceptable saubbers found during that -
interval. Snubters.may.be categorized, based upon their.
y accessibility during power operation. as accetssible cr _ inaccessible, These catergories may be exandned separately or jointly
- haver, the licensee must make ano document thet decision before any inspection and shall use-that decision as the basis upon khich te determine the next_ inspection interval for that category, h
Note 2*
Interpolation between population or category sizes and tha number Of unacceptable snubbars is permissible. Use text ther integer for the value of the limit for Columns A 8, or C if that integar ircludes a fractional.salue of unc.cceptable snubbers as determined by interpolation.
Note 3:
If-the nuinber of unacceptable snubbers is:equsi to or less then the number in Coluen A, the next inspection interval acy be twice the i
previous interval but not greater than 48 months.
I Note 4:
-lf the number of unacceptable snubbars is em;al-to or less than the nuasber in Column B but greater than the number in Coluen A, the next inspection interval shall be the s&M as the previous interval.
LIMERICK - UNIT 2 3/4 7-11.
A m dment No. 15 g
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u T W _4,7,4-1 (conttwedi e
53,81U V.5gt.,,JNTPEC110N INTCRVAL Note 5:
If the 6 umber of unacceptable snubbers is equal to or greater than the number in Column.C. the next inspection interval shall be two-thirds of the previous interval. However, if the number of unacceptable snubbers.ts les8 than tiie number in Colwi C but greater than the nurnber in Column B, the nent-interval shall be reduced proportionally by interpolation. that is, the prev bus interval shall De reduced by a factor that is one third of the ratio of the difference between the number of unacceptable snobbers found during the previous interval and the numt,er in Column 8 to the difference in the numoers in Columes 8 and C.
t Note 6:
The provisions of Specification 4.0.2 are applit.able for all inspection intervals up to and including 40 months.
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LlHERICK - UNIT 2 3/4 7-llb AmendmentNo.i3 9
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Ptaa? SYSTEas SURVEILt.ANCE REQUIREMENTS (Continued) c.
Visuoi Inspection Act_ept? nee Criteria Visual inspections shall verify (1) that there are no visible indicatih95 of demage or impaired OPERABILITY, (2) attachewints to the fcuneation or supporting structyre are secure, and (3) fasteners for stti.chment of the snubber to the component and to the snubber anchorage are secure.
Snubbers which appear inoperable as a result of visual im.pections shall ba classified as unacceptable and may be reclassif146 acceptable for the purpose of establishirg the next visus) inspection intet^tal, providing that! (1) the cause of the rejection is clearly establi%hed and remedied for that part.icular snubber and for other snubbers irre.spective of type on that system that may be generically susceptiblet and/or (2) the affected snuboer is functionally tested in the ac fou9d condition and determined OPERABLE per Specifications 4,7.4f.
For those snubbers cosmon to nare thars one system, the OPERABILITY of such snusbers shall be considertd in assessing the surveillance schedule for each of the related systems. A review and evaluation shall bc perfonned.and documentc3 to justify continued operation with en unacceptable snubber.
If continued operation canrot be justified, the snubber shall be ceclared inoperdble and the AC110N requirements shall be met, d.
,Tn njient Even1 1n$pectig An inspection shall be performed of all snubbers attached to sect!Ons of systems that have itxperienced unexpected, potentially d6maging transients, as determined from a review of operational data or 5 visual inspection of the systems, within 72 hours8.333333e-4 days <br />0.02 hours <br />1.190476e-4 weeks <br />2.7396e-5 months <br /> for accessible systems and 6 months for inaccessibic systems following this determinatton.
In addition to satisfying the visual inspection acceptance criteria, 1
freedom-of-motion of mechanical snubbers shall be verified using at least
-one of the followingt (1 manually induced snubber moveinant; or (2) evaluationofin-placesnu)bcerpistonsettinglor(3)Strokingthe mechanical snubber through its full range of travel.
4 LINERit(
UNIT 2 3/4 7-12 Amendment Wo.15 j
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a tir. George J. Beck Limerick Generating Station Philadelphia Electric C wpany Units 1 & 2 (c:
e J.W.Durham,Sr.lCounsel Esquire tir. Thomas Gerusky, Director Sr. V.P. & Genera Bureau of Radiation ProtectiLn Philadelphia Electric Company PA Dept. of Environnental tesources 2301 t'arket Street P. O. 00x 2063 Philadelphia, Pennsylvania 19101 Harrisburg, Pennsylvania 17170 lir. Fod Krich 52A-5 Single Point of Contact Philadelphia Electric Company P. O. Box 11800 955 Chesterbrook Boulevard Parrisburg, Pennsylvania 17108-188 Wayne, Pennsylvania 19087-5691 14r. Graham 11. Leitch, Vice President tir. Garrett Edwards Limerick Generatints Station Superintendent-Technical Post Office Box A Limerick Generating Stetion Senatoga, Pennsylvania-19464 P. O. Box A Sanatoga, Pennsylvania 19464 tir John Doering Plant Itanager tir. Gil J.14adsen Limerick Generating Station Peuglatory Engineer
. P.O. Box A Limerick Generating Station Sanatoga, Pennsylvania 19464 P. O. Box A Sanatoga, Pennsylvania 19464 Regional Administrator U.S. Iluclear Pegulatory Comission Libraiy Region i US t:uclear Regulatory Comission 475 Allendale Road Region 1 King of Prussia, PA 19406 475 Allendale Poad King of Prussia, PA 19406 fir. Thomas Kenny Senior Resident inspector US t uclear Re(ulatory Commission P. O. Box 596 Pottstown,-Pennsylvania 19464 11r. George A. Ilunger Project Itaneger Limerick Generating Statier.
P. O. Box A Sanetoga, Pennsylvania 19464
- fir. Larry lioptins Superintendent-Operations Limerick Generating Station P. O. Box A Sanatoga, Pennsyhania 19464 l.
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