ML20070S505

Proposed Tech Specs 4.7.8b & 4.7.8c Re Surveillance Requirements for Visual Insp of Snubbers

ML20070S505
Person / Time
Site:	Vogtle
Issue date:	03/29/1991
From:	GEORGIA POWER CO.
To:
Shared Package
ML20070S503	List: ML20070S499 ML20070S505
References
NUDOCS 9104020311
Download: ML20070S505 (8)

Text

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ENCLOSURE 3 V0GTLE ELECTRIC GENERATING PLANT REQUEST TO REVISE TECHNICAL SPECIFICATIONS 4.7,8b AND 4.7.8c INSTRUCTIO11S FOR INCORPORATION The proposed change to the Vogtle Unit 1 and Unit 2 Technical Specifications would be incorporated as follows:

Remove Paag Insert Paag X X 3/4 7-19 3/4 7-19 3/4 7-20 3/4 7-20 3/4 7-24a 3/4 7-24b B3/4 7-5 B3/4 7-5 B3/4 7-Sa 9i04020311 910329 E3-1 A

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.' LINITING CONDITIONS FOR OPER ATION AND SURVEILLANCE RE0VIREM(NT$

SECTION gg 3/4.1 PLANT SYSTEMS 3/4.7.1 TURBlNE CYCLE

$afety Valves............................................ 3/4 7-1 TABLE 3.1-1 MAXIMUM ALLOWABLE POWER RANGE NEUTRON FLUX HIGH SETPOINT WITH INOPERABLE STEAM LINE $AFEIY VALVES. ...... 3/4-7-2 TABLE 3.1-2 STEAM LINE SAFElv VALVES PER L00P..................... -3/4 7-3 Au x i l i a ry F e edwa t e r Sys t em. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3/4 7-4 Condensate Storage Tank.................................. -3/4 7-6 Specific Activity........................................ 3/4 7-1 T ABLE 4.1-1 SECONDARY COOLANT SYSTEM SPfCIFIC ACTIVITY SAMPLE AND ANALY$l$ PR0 GRAM......,.............................. 3/4 7-B Main Steam Line Isolation Valves......................... -3/4 7-9  !

3/4.7.2 STEAM GENERATOR PRESSURF/IEMPERATURE LIMITATION.......... .

3/4 7-10 3 /4 . 7 . .) COMPONENT COOLING WATER SYSTEM........................... 3/4.7-11 3/4.7.4 NUCLE AR SERVICE COOLING WATER (NSCW) SYST EM. . . . . . . . . . . . . . 3/4-7-12 3 /4 .1-. 5 ULTIMATE HEAT $1NK................. ..................... 3/4 7-13 3/4.7.6 CONTROL R00'4 EMERGENCY flLTRATION SYSTEM (COMMON SYSitu); 3/4 7-14 3/4.7.7 - PIPING PENEIRATION AREA FILTRA110N AND ExpAUST SYSTEM....- . 3/4 7-17 3/4,7.B $NUBBERS................................................. 3/4'7-19 FI6URE 4.1-1 $ AMPLE PLAN'2 FOR $NUOBER FUNCTIONAL TEST......._..... 3/4 7-24

-TABLE 4.1-2 SNUBP!R VISUAL INSPECil0N INTERVAL.................... 3/4 7-24  !

3/4.7.9 $EALED SOURCE CONTAMINATION.............................. 3/4 7-25 3/4.7.10 AREA TEMPERATURE MONITORING........................,..... 3/4 7-27 .

TABLE 3.1-3 AREA TEMPERATURE MONITORING.........................., 3/4 7 28 3/4.7.11= ENGINEERED SAFETY I(ATURES (ESF)-ROOM COOLER AND SAFE 1Y-R E L AT E D C HI L L E R, ' $ Y' T EM . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3/4 7-29

+

3/4.7.12 REACTOR COOLANT PUMP-THERMAL BARCIER COOLING WATER ISOLAT10N................................................ 3/4 7-30 3/4.7.13 DIESEL GENERATOR BUILDING AND AUX 11.lARY FEEDWATER PUMPHOUSE ESF HVAC $YSTEMS............................... . 3/4 7-3)-

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V06TLE UNIT $ - 1 & 2 X Amendmerit No. (Unit 1)

Amendment No. (Unit 2) e -

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PLANT' SYSTEMS 3/4.7.8 SNUBBERS LIMITING CONDITION FOR OPERATION ,

3.7.8 All snubbers shall be OPERABLE. The only snubbers excluded from the requirements are those installed on nonsafety-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.- ,

APPLICABILITY: H00ES 1, 2, 3, and 4. M00ES-5 and'6 for snubbers-located a systems required OPERABLE in those MODES.

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 re-;

store the inoperable snubber (s) to OPERABLE status and perform an engineering ~ eval-uation per Specification 4.7,89, on the attached component or-declare the attached system inoperable and folicw the appropriate ACTION statement for that system..

SURVEILLANCE REQUIREMENT 3 4.7.8 Each snubber shal' be demonstrated OPERABLE by performance of the following-augmented inservice ins; iction prcgram 1n addition,to the requirements of:

Specification 4.0.5.

a. Inspection; Types As used in this specification, type of snubber shall mean snubbers l

of the same--design and-manufacturer, -respective of capacity,

b. Visual Inspections Snubbers are categorized as inaccessible or-. accessible during? reactor operation. Each'of these categories (inaccessible'and accessible);may be inspected independently according to:the schedule determined by Table.

4.7-2. The' visual inspection intervali.for each category of: snubber shall be determined based-upon the criteria provided in Table 4.7-2 and the

-first inspection-Interval:determi.ned using this criteria shall be-based upon the: previous inspection-interval asLestablished:by'the requirements i

in-effect before Amendment and __ for Vogtle Units l-and 2,.

respectively, p

l V0GTLE UNITS - :1 & 2 - 1/4 7-19 Amendent No.~ -(Unit 1)

Amendment No. Jbnit 2)-

.P'LANT SYSTEMS SURVEILLANCE REQUIREMENTS (Continued)

c. Visual Inspection Acceptance Criteria Visual inspections shall verify that: (1) there are no visible indications of damage or impaired OPERABILITY,-(2) attachments to the foundation or supporting structure are functional, and (3) fasten-ers for attachment of the snubber.to the component and to the snubber anchorage are functional. Snubbers which appear inoperable as a-result of visual inspections shall be classified as unacceptable end may be reclassified acceptable for the purpose of establishing the next visual inspection interval, provided that: (1) the cause of the rejection is clearly established and remedied for that particular snubber and for other snubbers, irrespective-of type, that may be. l generically susceptible;.and (2) the affected snubber is func-tionally tested in the as-found condition and determined OPERABLE per Specification 4.7.8f. All snubbers found connected to an l inoperable common hydraulic fluid reservoir-shall be counted as unacceptable-and may'be reclassified as acceptable for: determining'the next inspection interval provided that criteria (1) and (2) above are met. A review and evaluation shall be performed and documented to justify continued operation with.an unacceptable. snubber. If. continued operation cannot be justified, the snubber shall be declared inoperable and the ACTION requirements shall be met.-

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d. Transient Event Injipaction An inspection shall be performed of all snubbers attached to sections of systems that have experienced unexpected, potentially damaging transients as determined from a review of operational data and a visual inspection __ofithe_ systems within 6 months following such an event. In-addition to satisfying the~ visual inspection acceptance criteria, freedom-of-motion of mechanical snubbers shall be verified using at least one of the following: (1) manually induced snubber movement; or (2) evaluation of in-place snubber piston setting; or-(3) stroking the mechanical snubber through.lts full' range of travel, i

e. Functional Tests During the first refueling. shutdown and at least once per-18 months thereafter during-shutdown, a representative sample;of-snubbers of each type shall be tested using one of the.following sample plans.

The sample plan for each type shall'be selected' prior " the test period and cannot.be changed during tha test period. lne NRC Regional Administrator shal' be notified in wri.ing of the sample plan selected for each. snubber type grior to the-test period or the-sample plan used in the prior test-period shall-be implemented: ,

l) At least 107.~of the'tothl' of each type of snubber shall be functionally tested either in-place or in.a bench test. For-

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each snubber of a-type.that does not meet the functional test-acceptance criteria of Specific.ation 4.7.Sf., an additional'107.

of that type of snubber shall De functionally tested until no more failures are found or until all snubbers ~of that type have.

been functionally tested; or V0GTLE UNPS - I & 2 3/4 R Amendment No. (Unit I)

Amenement No. -(Unit 2)

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-TABLE 4.7-2

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t' SNUBBER VISUAL INSPECTION INTERVAL NUMBER'0F UNACCEPTABLE SNUBBERS-Population Column A Column B _ Column C or. Category Extend Interval- Repeat Interval: Reduce Interval (Notes 1 and 2) (Notes 3 and 6)- (Notes 4 and 6) (Notes 5 and 6) 1 0- 0 1 80 0 0- 2 100 0 1 4 150 0 3 8 200 2 5 13.

300 5 12 25-400 8 18 36_ -

500 12 24 48' 750 20 40 78 1000 or greater 29 ~ 56- 109 Note 1: The next visual inspection intervalI orca f snubber population.'or-category-size shall be determined based _upon:the previous-inspection interval and the number;of unacceptable snubbers found during that:.

Interval. Snubbe s'may_be categorized, based uponi.their.

accessibility during power operation,Las: accessible or inaccessible.

These categorici may be examined separately or jointly. 'However, the-l licensee must make and-document that decisio( before any, inspection

! and shall use that decision as the basis upor, which to' determine _the=

l next inspection. Interval.for that-category.:

Note 2: Interpolation.between_ population or category sizes and the number of unicteptable snubbers is permissible. =Use:next lower integer forsthe va'ue of the limit for' Columns Ac B, or C if that integer includes a f'actional value OfLunaccepuble snubbers as determined by Interpolation.

Note 3: IfLthe number of unacceptable snubbers 1s; equal to or less than 'the number in Column A, the next inspection interval may.be twice:the previous interval but not greater than 18 months.

Note 4: If the number of-unacceptable snubbers-is equal to or less than-the i

number in Column B but greater th+.1 ths number in Column _ A,' the next inspection interval shall be +t same as the previous interval, i

l V0GTLE UNITS - 1 &~2 3/4 7-24a. Amendment No. TUnit 1-)

-Amendment No. (Unit 2) l L _

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l TABLE 4;7-2 (Continued)  ;

i SNUBBER VISUAL INSPECTION INTERVAL l

i Note 5: If the number of unacceptable snubbers is equal to or greater-than 5 the number in Column C, the next-inspection interval shall be f

'two-thirds of the previous interval. _However, if the nuubergof unacceptable. snubbers is less than the number-in Column-C but greate'r than the number in Column 8, the next interval shall be reduced proportionall.y by interpolation ~ that is, the previous. interval shall

'be reduced by a factor that is one-third of the ratio of the 1

-difference between the number-of-unacceptable snubbers found'during '!

the previous interval and the number =in Column B to-the-difference-in  !

the numbers in Columns B and C.. .l Note 6: The provisions o'f Specification 4;0.2 are; applicable for all inspection ittervais-up to and including 48 months.- {

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V0 GILE UNITS - 1:& 2 3/4'7-24b.

~Arreronent No.  :(Unit 1) f Ainondent -No.- (Uni.t 2). j

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PLANT SYSTEMS BASES 1Ny'IBERS (Continued)

Nuclear Regulatory Commission (~'C) Generic Letter 90-09, " Alternative Requirements for Snubber Visual Inst ' ion Intervals and Corrective Actions,"

dated December 11, 1990, provides a, , ternate method for determining the next interval for the visual inspection of snubbers from that to which the plant was originally licensed. The original schedule for-snubber visual inspection was based only on the number of inoperable snubbers found during the previous visual

, inspection, irrespective of the size of the snubber population. As a result, plants having a large number of snubbers found the original inspection schedule to be excessively restrictive. Significant resources, . including subjecting plant personnel to unnecessary radiological exposure .were expended in order to comply with the visual inspection requirements.- The alternate schedule provided by NRC Generic letter 90-09 maintains the same confidence level _ as that to which the plant was originally licensed and generally allows for the performance of .

visual inspections and any corrective actions during plant outages.

Incorporated herein as Table 4.7-2, " Snubber Visual Inspection Interval,"_the i alternate inspection schedule is based'upon_the number of unacceptable snubbers

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found during the previous inspection in proportion to the size of various snubber populations or categories. Snubbers may be categorized, based upon their accessibility during power operation, as accessible.or inaccessible. The categories may be inspected separately or jointly. However, categorization-and inspection thereof must be made and documented prior to any inspection and that '

t decision will constitute the-basis- for determining the next inspection interval-for that category. A snubber is considered unacceptable if it f ails-to satisfy 4 the acceptance crit:ria for.the visual inspection, if review and evaluation cannot justify continued operation with an unacceptable snubber, the snubber.

shall be declared inoperable and the applicable-ACTION requirements shallibe met. To determine the next inspection interval, the unacceptable snubber may be reclassified as acceptable if it can be- demonstrated- that- the. snubber is operable in its- as-found' condition by the performance of a- f unctional- test and i if it satisfies the acceptance criteria for' functional testing. The next inspection interval may be twice, the same, or reduced to as much as. two-thirds  !

of the previous inspection interval and is contingent upon the number of l unacceptable snubbers found in-proportion to the population or category for each  !

type of snubber _ included in the previous inspection. While the original [

inspection schedule requirements established inspection intervals of 18 months ,

(the length of a nominal fuel cycle) or a f raction thereof based on-the nuuber [

of inoperable snubbers of each type for the previous inspection period, the  !

alternate method allows inspection intervals to be' compatible:with a 24-month -

I fuel cycle. The interval may be increased to every other refueling outage for -

plants on a 24-month f uel cycle or up ~to.48 months for _ plants with other f uel cycles if few unacceptable snubbers are found f rom the previous inspectioni 3

-Table 4.7-2 establishes limits for determining lthe next inspection interval and '

is consistent with the guidance provided in NRC Generic Letter 90-09.

V0GTLE UNITS - 1 & 2 8 3/4 7-5 Amendment No. (Unit _l)

Amendment No. (Unit 2) kuna _ - , -

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,1 PLANT SYSTEMS l

BASES SNUBBERS (Continued)

The acceptance criteria are to bc used'in the visual inspection to determine

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q OPERA 0lLITY of the snubbers. -For example, if a fluid por1. of a hydraulic snubber is found to be uncovered, the snubber shall be counted 'as unacceptable and may be reclassified as acceptable for determining the next visual-inspection interval provided that certain criteria in Specification'4.7.8c are met. A review and evaluLtion shall be performed and documented to justify continued-operation with tht: unacceptable snubber._ If continued operation cannot be justified, the snubber shall be declared inoperable and the ACTION requirements shall be met.

To provide-assurance of-snubber functional reliability, one of three functional testing methods is used with the stated facceptance criteria:

1. Functionally test 10% of a--type of snubber with an additional  ;

-10% tested for each functional testing failure,-or Functionally test'a sample size and determine sample-acceptance-or.

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-rejection using Figure 4.7-1, or

3. Functionally test a representative sample size and determine sample acceptance or rejection using the stated equation. I Figure 4.7-1 was developed using "Wald's Sequential' Probability Ratio Plan" as-described in " Quality Control and Industrial Statistics" by-Acheson J. Duncan.

Permanent or_ other exemptions f rom the surveillance program for individu .1 snubbers =may be granted by the Comission .if a justifiable basis _ for exemption is presented and,_if applicable, snubber-life-destructive. testing was performed i to qualify the snubbers'for'the applicable design conditiont-at either the com-pletion of their fabricatioa or at a subsequent date._ Snubbers so exempted shall be listed in the list af individual snubbers indicatin5 the' extent of the exemptions.

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! V0GTLE- UNITS - 1 & 2 B 3/4 7-Sa Amendment No.L (Unitil) l Amendment No. (UnitL2) i 1

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