ML20207B779

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Proposed Tech Specs,Justifying Deletion of Reject Line & Region of Tech Spec Figure 4.7.4-1 & Third Sample Plan of Tech Spec 4.7.4.e.3
ML20207B779
Person / Time
Site: Grand Gulf Entergy icon.png
Issue date: 07/25/1988
From:
SYSTEM ENERGY RESOURCES, INC.
To:
Shared Package
ML20207B777 List:
References
NUDOCS 8808040150
Download: ML20207B779 (3)
v • d • e


Text

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HfG G7/T8 PLANT SYSTEMS

SURVEILUsNCE REQUIREMENTS (Continued)

C%.

e. Functional Tests _ ,

During the first refueling shutdown and at least once per 18 ronths thereaf tar during shutdown, a representative sample of snubbers shall be tested using one of the following sample plans for each type of snubber. The sample plan shall be selected prior to the test period and cannot be changed during the test period. The NRC Regional Administrator shall be notified in writing 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 10% 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 acceptance criteria of Specification 4.7.4.f, an additional 5%

i of that type of snubber shall be functionally tested until no more failures are found or until all snubbers of that type have I been functionally tested; or

2) A representative sample of each type of snubber shall be func-tionally tested in accordance with Figure 4.7.4-1. "C" is the total nunber of snubbers of a type found not meeting the accept-ance requirements of Specification 4.7.4.f. The cumulative num-ber of snubbers of a type tested is denoted by "N". At the end of each day's testing, the new values of "H" and "C" (previous day's total plus current day's increnents) shall be plotted on

( Figure 4.7.4-1. If et es the the sekt phtt:d hih k th -

W.j::t" rykn :11 :nders of thet t pri61; 6 No-o.;;g' i

in Wd. 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 :r th: "Rc':ct" r:gB , or all the l l

snubbers of that type have been tested / M

3) An initial representative sample of 55 snubIers shall be fun tionally tested. For each snubber type which does not . the fune.tional test acceptance criteria, another sampi at least l one-half the size of the initial sample shall ested until the total number tested is equal to the initi ample size multi-plied by the factor,1 + C/2, where " " is the number of snubbers found which do not meet the func al test acceptance criteria.

The results from this sample an shall be plotted using an "Ac-cept" line which followy . e equation N = 55(1 + C/2). Each snubber point shoupHre plotted as soon as the snubber is tested.

If the point ed falls on or below the "Accept" line, testing of that c of snubber may be terminated. If the point plotted fall ove the "Accept" line, testing must continue until the l

nt falls in the "Accept" region or all the snubbers of that type have been tested.

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( 890304cim0 880725 i {DR ADOCK 05000416

' PDC 3/4 7-11 Amendment No.35 , _

GRAND GULF-UNIT 1

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"EJECT

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O 70 80 90 10 0 t

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FIGURE 4.7.4-1

' e (SAMPLE PLAN 2) FOR SNUBBER FUNCTIONAL TEST

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GRAND GULF-UNIT 1 3/4 7-34 beunwort No. -

WG.' Cr/as'

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PLANT SYSTEMS BASES 4

3/4.7.4 SNUBBERS (Continued)

The acceptance criteria are to be used in the visual inspection to determine OPERABILITY of the snubbers. For example, if a fluid port of a hydraulic snubber is found to be uncovered, the snubber shall be declar'ed inoperable and shall not be determined OPERABLE via functional testing.

To provide assurance of snubber functional reliability one of-Weeh functional testing methods is used with the stated acceptance criteria:

1. Functionally test 10% of a type of snubber with an additional 5%

tested for each functional testing failure, or

2. Functionally test a sample size and determine sample acceptance-++-

rejecti:r using Figure 4.7.4-1/ g a r.~ ,4 - ,m , + ,+ , . ,. . ,...<mo e ,- 1. ,4,- --a a_.-. ~ 4-- -a- "

h5A$U5S5dTr"r5jeitIEIUiid*3Eht'dekU$tf5$ e Figure 4.7.4-1 was developed using "Wald's Sequential Probability a Ratio Plan" described in " ual'ty_Co_ntroCand Industchi (tat ut3m _h v _ _ _ _ ~

Ache J. Dunca and the Ritvision 2 draf t (9786) of the ATlSI/KSME OM4 document (Examinatlionlaid ferformancL Jestina af. Nuclear Power P_lant Dynaqic_ RestrajntsJSnubbers).

rermanera or oT.ntr exemptions 7 rom trie surveillance program 7or indivioual snubbers may be granted by the Commission if a justifiable basis for exemption is presented and, if applicable, snubber life destructive testing was performed to qualify tha snubbers for the applicable design conditions at either the completion of their fabrication or at a subsequent date. Snubbers so exempted shall be listed in the list of individual snubbers indicating the extent of the exemptions.

The service life of a snubber is established via manufacturer input and information through consideration of the snubber service conditions and asso-ciated 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.

3/4.7.5 SEALED SOURCE CONTAMINATION The limitation on removable contamination for sources requiring leak testing, including alpha emitters, is based on 10 CFR 70.39(c) limits for plutonium. This limitation will ensure that leakage from byproduct, source, and special nuclear mateefal sources will not exceed allowable intake values.

Sealed sources are classified into three groups according to their use, with surveillance requirements commensurate with the probability of damage to a source in that group. Those sources which are frequently handled are required to be tested more often than those which are not. Sealed sources which are

'- continuously enclosed within a shielded mechanism, i.e. , sealed sources within radiation monitoring or boron measuring devices, are considered to be stored and need not be tested unless they are removed from the shielded mechanism.

GRAND GULF-UNIT 1 B 3/4 7-3 Amendment No.35 3-

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