ML17305B577

Proposed Tech Specs 3/4.7.9,changing Snubber Functional Testing Surveillance Interval

ML17305B577
Person / Time
Site:	Palo Verde
Issue date:	05/29/1991
From:	ARIZONA PUBLIC SERVICE CO. (FORMERLY ARIZONA NUCLEAR
To:
Shared Package
ML17305B571	List: ML17305B570 ML17305B577
References
NUDOCS 9106050367
Download: ML17305B577 (2)

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PLANT SYSTEMS SURVEILLANCE REQUIREMENTS (Continued) the visual inspection acceptance criteria, freedom-of-motion of mecnanica1 snubbers shall be verified using at least one of the followina: '1) manually induced snubber movement; or (2) evaluation of in-place snubber piston setting; or (3) stroking the mechanical snubber through its full range of travel.

e. Functional Tests During the fi rst refueling shutdown and at least once per 18 months~

thereafter during shutdown, a representative sample of snubbers shall be tested using one of the following sample plans. The sample plan shall be selected prior to the test period and cannot be changed during the test period. The NRC Regional Administrato~ shall be notified in wri .ina of the sample plan selected prior to the test period or the sample plan used in the prior test period shall be implemented:

1) At least 10M of the total of each type of snubber shall be functionally tested either in-place or in a bench test. For each snubber of a type that does not meet the functional test acceotance criteria of Specification 4. 7. 9f., an additional lOX of :nat type of snubber shall be functionally tested until no more rai lures are found or .until all snubbers of that. type have been functionally tested; or

2) A representative. sample of each. type of snubber -shall be func=..

tionally tested in accordance with Figure 4.7-1. "C" is the total number of snubbers of a type found not meeting the acceptance requirements of Specification 4.7.9f. The cumulative number of snuooers of a type tested is denoted by "N". At the end of each day's testing, the new values of "N" and "C" (previous day' total plus current day's increments) shall be plotted on Figure 4.7-1. If at any time the point plotted falls in the "Reject" region all snubbers of that type shall be functionally tes ed. If at any time the point plotted falls in the "Accept" region, testing of snubbers of that type may be terminated.

'When the point plotted lies in the "Continue Testing" region, additional snubbers of that type shall be tested until the point falls in the "Accept" region or the "Reject" region, or all the snubbers of that type have been tested. Testing equipment failure during functional testing may invalidate that day's test-ing and allow that day's testing to resume anew at a later time, providing all snubbers tested with the failed equipment during the aay of equipment failure are retested; or mac

& !Anal 3) An initial representative sample of 55 snubbers shall be ROQ,

'IAO functionally tested. For each snubber type which does not meet OO the functional test acceptance criteria, another sample of at

,'Mg QO least one-half the size of the initial sample shall be tested until the total number tested is equal to the initial sample

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,(9O size multiplied by the factor, 1 + C/2, where "C" is the number IOQ of snubbers found which do not meet the functional test

'lOCC "O acceptance criteria. The results from this sample plan shall

,'OK be plotted using an "Accept" line which follows the equation i,MQ N = 55(l + C/2). Each snubber point should be plotted as soon ik Q.Q -

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