ML20246L387

Proposed Tech Specs,Allowing Snubber Functional Test Surveillance Interval to Be Increased to Max of 30 Months W/ Corresponding Increase in Snubber Test Sample Size

ML20246L387
Person / Time
Site:	Davis Besse
Issue date:	06/10/1989
From:	TOLEDO EDISON CO.
To:
Shared Package
ML20246L384	List: ML20246L378 ML20246L387
References
1684, NUDOCS 8907180419
Download: ML20246L387 (2)

Text

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'?. _. IiocketNumber50-346" A yLicense Number NPF-3' e*

Serial Number.1684

• -Enclosure-Pag,e 1 *

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l 1

PLANT SYSTEMS i

SURVEILLANCE REQUIREMENTS (Continued)

The inspjetion interval for functional testing shall be 18 months.W Snubbers which are scheduled for removal for. seal maintenance may be included in the test sample' prior to  :

any maintenance on the snubber.

The representative sample shall. consist of at least 10 percent (rounded off to next highest integer) of each group of snubbers in use in the Plant.- The selection process shall ensure that,all snubbers, regardless of l-their. accessibility classification, are functionally tested at least once every ten inspection intervals.

c. Acceptance Criteria For hydraulic snubbers (either inplace testing or bench testing), the test shall verify that:

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1. Snubber piston will allow the hydraulic fluid to

" bypass" from one side of the piston to the other to assure unrestrained action is achieved within the specified range of velocity or acceleration in both tension and compression.

2. When the snubber .is subjected to a movement which creates a load condition that exceeds the specified range of velocity or acceleration, the hydraulic fluid is trapped in one and of the snubber causing suppression of that movement.

3. Snubber release rate or bleed rate, where required, occurs in compression and tension.

For mechanical snubber in place and bench testing, the test shall verify that:

1. The farce that inir4=* : Iree movement of the snubber rod in either tension or compression is less than the specified maximum drag force.

2. Activation (restraining action) is achieved in both tension and compression within the specified range. l DAVIS-BESSE, UNIT 1 3/4 7-23 Amendment No. 58,94 111 8907180419 890610 PDR ADOCK 05000346 p PNV

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, fDocket:Numbar50-346'

.- .Licen:e Numb:r NPF **-

'Secisi Number 1684

'E'nclosure Page 2. -

The next functional inspection due after September 14,1988 shall be performed no later than March 14,1991. The initial sample size shall be .

determined according to the expression S - (x/180) times 100%, where "I" is -

L the time period between inspections,in months or partial months, rounded F

to the higher value and "S"is the initial sample size, in percent.

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