ML20211Q336

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Proposed Tech Specs Removing Current Special Exception Which Precludes Applying Eighteen Month Functional Testing Surveillance to SG Hydraulic Snubbers
ML20211Q336
Person / Time
Site: Millstone Dominion icon.png
Issue date: 09/07/1999
From:
NORTHEAST NUCLEAR ENERGY CO.
To:
Shared Package
ML20211Q226 List:
References
NUDOCS 9909150046
Download: ML20211Q336 (5)


Text

1 J"- n, = %

PLANT SYSTEMS i

SURVEILLANCE RE0UTREMENT (Continued) that may be generically susceptible; and (2) the affected snubber is functionally tested in the as-found condition and determined (J

3 OPERABLE per Specification 4.7.8.e or 4.7.8.f, as applicable. All snubbers found connected to n inoperable common hydraulic fluid reservoir shall be counted as unacceptable for determining the next inspection interval. 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 3.CTION requirements shall be met.

d.

Snubber Tests o

At least once per eighteen (18) months during shutdown, a-presen-tative sample (

g of hanical and hydraulic, e-p+

+--- -^4. m... 4_ snubber, O tt r o in use in the plant) shal es ea either In place or tri a bench test. For each snubber that does not meet the test acceptance criteria of Specification 4.7.8.e or 4.7.8.f, as applicable, an additional 5% of that type of snubber shall be tested.

Testing shall continue until no additional inoperable snubbers are found within a sample or until all snubbers have been tested. The representative sample selected for testing shall include the various configurations, and the rangs of size and capacity of snubbers.

Snubbers identified as "Especially Difficult to Remove" or in "High Radiation Zones During Shutdown" shall also be included in the representative sample.*

In addition to the regular sample, in locations where snubbers had failed the previous test due to operational or environmental condi-tions (excessive vibration, water hammer, high radiation, extreme heat or humidity, etc.), the snubbers currently installed in these.

locations shall.be tested during the next test period.

Test results i

of these snubbers may not be included for the resampling. All replacement snubbers shall have been tested prior to installation.

All s am gene tor hydra lic snubbers hall be ested d refur l

bis d every even year or less in a ordance ith t preven ive l m nte'nanc rogram, i lieu of the unctio test quireme s is spec ication.

O x

A W DELE-T&

  • Permanent or other exemptions from functional testing for individual snubbers in these categories may be granted by the Commission only if a justifiable basis for exemption is presented.

9909150046 990907 PDR ADOcK 05000336 P

PDR HILLSTONE - UNIT 2 3/4 7 22 Amendment Nos. JJ, fJ. EJ, I

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96. 118. 135. Y(N

PLANT SYSTEMS BASES 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 gen susceptible, that snubber may be exempted from being counted as inoperable.

Generically susceptible snubbers are those which are of a specific make or model and have the same design features directly related to rejection of the snubber by visual inspection, or are similarly located or exposed to the s envirymental conditions such as tem erature,T6 ~

e size nd locati n'of t e s eam g radiation, and vibration.

Ou to Th y raulTc s ulbers, re ul remo al and era r esting as specifte for hy aulic and echanic snubb sw id rep esent a signific t undert ing dur ng each r fueling utage.

As uch t se snub ers have een trea d separ ely and e tested and ref rb ed s group in accor wit the a nufacture 's reco, ended re enta ve maintena ce program. ante A

hen a snubber is found inoperable, an engineering evaluation is -

performed, in addition to the determination of the snubber mode of failure in order to determine if any safety-related component adversely affected by the inoperability of the snubber.

or system has been 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.

the installed snubbers will be tested during plant shu month intervals.

testing of additional units. Observed failures of these sample snubbers shall require Hydraulic snubbers and mechanical snubbers ma different entity for the' above surveillance programs.y each be treated as a The service life of a snubber is evaluated via manufacturer input and information through consideration of the snubber service conditions and replaced, spring replaced, in high radiation area, in higj etc....).

The requirement to monitor the snubber service life is included to i

ensure that the snubbers periodically undergo a performance evaluation in view of their age and operating conditions.

bases for future consideration of snubber service life.These records will provide statis the maintenance of records and the snubber service life review are not intend-The re ed to affect plant operation.

[

3/4.7.9 DELETED l

MILLSTONE UNIT 2 om B 3/4 7-6 Amendment Hos. JJ, )) 95. JJE, g

Docket No. 50-336 817832

+

e Millstone Nuclear Power Station, Unit No. 2 Proposed Revision to Technical Specifications Steam Generator Hydraulic Snubbers Retyped Pages i

September 1999 i

1

r 1.

' PLANT SYSTEMS SURVEILLANCE REQUIREMENTS that may be generically susceptible; and (2) the affected snubber is functionally tested in the as-found condition and determined OPERABLE per Specification 4.7.8.e or 4.7.8.f, as applicable. All snubbers found connected to an inoperable common hydraulic fluid reservoir shall be counted as unacceptable for determining the next inspection interval. 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.

d.

Snubber Tests At least once per eighteen (18) months during shutdown, a represen-tative sample (10% of the total of each type of snubber, mechanical and hydraulic, in use in the plant) shall be tested either in place I

or in a bench test. For each snubber that does not meet the test acceptance criteria of Specification 4.7.8.e or 4.7.8.f, as i

applicable, an additional 5% of that type of snubber shall be

)

tested.

Testing shall continue until no additional inoperable snubbers are found within a sample or until all snubbers have been tested. The representative sample selected for testing shall include the various configurations, and the range of size and capacity of snubbers.

Snubbers identified as "Especially Difficult to Remove" or in "High Radiation Zones During Shutdown" shall also be included in the representative sample.*

In addition to the regular sample, in locations where snubbers had failed the previous test due to operational or environmental condi-tions (excessive vibration, water hammer, high radiation, extreme heat or humidity, etc.), the snubbers currently installed in these locations shall be tested during the next test period. Test results of these snubbers may not be included for the resampling. All replacement snubbers shall have been tested prior to installation.

l

  • Permanent or other exemptions from functional testing for individual snubbers in these categories may be granted by the Commission only if a justifiable l

basis for exemption is presented.

1

)

MILLSTONE - UNIT 2 3/4 7-22 Amendment No. JJ, JJ, JJ, o482 JJ JJJ, JJJ JJJ.

..t

. PLANT SYSTEMS BASES' I

.When the cause of the' rejectice, of a snubber is clearly established and remedied for. that snubber and for any other snubbers 'that may be generically susceptible, that. snubber may be exempted from being counted as inoperable.

Genertally susceptible snubbers are~ those which are of a specific make or model.od~ have the same design features directly related to rejection of the snubber by visual inspection, or are similarly located or exposed to the same environmental conditions such as temperature, radiation, and vibration.

When a snubber is found inoperable, an engineering evaluation is performed,.in addition to the determination of the snubber mode of failure, i

in order to - determine if any safety-related component or system has been i

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.

]

n

-To provide assurance of snubber reliability, a representative sample of the installed snubbers will be tested during plant shutdowns at eighteen -(18) i month ~ intervals.

Observed failures of.these sample snubbers shall require testing of additional units.

Hydraulic snubbers and mechanical snubbers may each be treated as a different entity for the above surveillance programs.

f The ' service life of a snubber is evaluated via manufacturer input and information through-consideration of the snubber service conditions and associated installation and maintenance records (newly installed snubber, seal

. replaced, spring replaced, in 'high radiation area, in high temperature area, etc....).. The requirement to monitor the snubber service life is included to ensure' 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 the snubber service life review are not intend-ed to: affect plant ' operation.

3/4.7.9~ 0ELETED I

'NILLSTONE - UNIT 2' B.V4 7-6 Amendment Nc: JJ,77,7),JJP, oser

JSJ,

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