ML17213B177

Suppl 1 to Analytical Justification of Seismic Test Adequacy of St Lucie,Unit 2 CPC & Ni Modules in Reactor Protection Sys Cabinet, Operability Rept

ML17213B177
Person / Time
Site:	Saint Lucie
Issue date:	03/21/1983
From:	FLORIDA POWER & LIGHT CO.
To:
Shared Package
ML17213B176	List: ML17213B175 ML17213B177
References
NUDOCS 8303250103
Download: ML17213B177 (26)

Text

ATTACHMENT ANALYTICAL JUSTIFICATION OF THE SEISMIC TEST ADEQUACY OF THE ST. LUCIE UNIT 2 CPC AND NI MODULES IN THE RPS CABINET (SUPPLEMENT NO. I)

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h A TABLE OF CONTENTS

~Pa e I) Discussion ~ ~ ~ ~ ~ ~ 3 II) Governing Equation ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ 0 ~ ~ ~ 4 III) Procedure ~ ~ ~ ~ ~ ~ ~ 5 IV) Minimum Overtesting of the RPS Cabinet at Frequencies of 5 Hz and Higher (S'tep 1 of Procedure) ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ 6 V) Calculation of Minimum Overtest Factors (90%)

for the RPS Cabinet (Step 2 of Procedure) ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ 11 VI) NIRRSmc: Tabulated and Plotted with NI TRSm (Steps 3 and 4 of Procedure) ~ ~ ~ ~ ~ ~ ~ 12

DISCUSSION The original analytical justification of the CPC and NI modules used a frequency-dependent derating method to correct the in-cabinet (RPS) response spectra (RRS for subject modules) for overtesting of the RPS cabinet. The procedure was found not to be acceptable. A second procedure was recommended, which is to derate the module RRS by a single factor (in each direction). This single factor would be determined by comparing the RPS cabinet's RRS and TRS in the frequency of 5Hz and higher. This range is sufficient due to the fact that all natural or resonant frequencies of the RPS cabinet are 7Hz and higher, as determined by testing. Also, the use of the 2nd procedure incorporates a 10% penalty to account for possible non-linear behavior of the cabinet.

Included herein is the derivation of the governing equation, data processing and the results of using the 2nd procedure..

Only the NI module is discussed herein because the CPC module results, while based on the first justification, were acceptable from the significant margin shown.

The results herein show that the NI module is indeed uglified for seismic based u on the testin of this module and the RPS cabinet.

The original analytical justification contains addition detail such as descriptions of abbreviations, references, ,etc.,'which may be helpful in the review of this (herein) document.

GOVERNING E UATION r

This equation is used to evaluate the degree of overtesting experienced by the RPS cabinet. 90% of this overtesting is used to correct the in-cabinet response spectra, A 105 penalty is taken to account for possible non-linear behavior of the cabinet.

Cabinet overtest = TRs~ RRS + (TRS - RRS c c c)

Cabinet overtest factor RRS + (TRS - RRS )

RRS 90K of cabinet overtest factor = RRS + 0.9 (TRS - RRS )

RRS .

RRS

+ 0.9'. TBS - 0.9..RRS c

RRS c

0.9 TRS c

+ 0.1 RRS c

RRS c

TRS 0 9 ~ 0.1 RRS = RRS  : [0.9 c + O.l]

c

PROCEDURE j

1) Find minimum value of (TRS) cabinet for all frequencies 5H and higher.

Do this for each of the four test axes.

Horizontal of F/8 test Vertical of F/B test Horizontal of S/S test Vertical of S/S test

2) Use the governing equation (0.9 c + 0.1) for each of the above .axes to determine overtest factors (90/).

3) Divide NI RRS by the 905 overtest factors (appropriate factors with appropriate axes) to obtain the corrected RRS (RRS ) for the NI.

4) Plot RRS mc (obtained in Step 3) against the NI RRS (RRS )

m to evaluate adequacy of NI .sei smi c qual i fi cati on.

Min'imum over'testing of RPS Cabinet at frequencies of 5Hz and higher (data circled)

I

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C CULATION OF MINIMUM OVERTEST FACTORS 90% FOR RPS CAB I NET

- step 2 of procedure-(TRS

1) Min)mum RRS of cabinet.

Hor (F/B) 3.9 2.60 at 8H2 1.5 Vert (F/B) 3.5 1.3 2.69 at 5H2 3.0 Hor (S/S) 1.5 2.0 at 6.3H2 Vert (S/S) 3.1 1.3 2.4 at 5H2 Overtest Factors (0 (TRS ) +

2) 90% 9 0 1)

~RRS Hor (F/B) 0.9 (2 60)

~ + 0.1 = 2.44 r

Vert (F/B) = 0.9 (2.69) + 0.1 = 2.52 Hor (S/S) = 0.9 (2.0) + O.l = 1.90 Vert (S/S) = 0.9 (2.4) + 0.1 = 2.25

NIRRS (Tabulated and Plotted with NI TRS )

- steps 3 8 4 of procedure-

TABULATED ecalculated Data under arrows (RRS )]

NI RRS (RRS mc

)

Note 1 Note 2 Note 3 Note 4 Fre Hz ~H- FB ~Y- FB ~H- S S ~Y- S S

(.)  : 2.44- ( )-:2.52- ( ) :1.90 = ( )-:225-1.0 2.7 2.9 1.2 2.9 1.5 2.4 1.28 3.3 1.4 3.1 1.2 3.1 1.6 2.8 1.2 1.6 4.9 2.0 4.0 1.6 3.2 1.7 3.7 1.6 2.0 4.0 1.6 4.2 1.7 6.0 3.2 4.2 1.9 2.5 7.7 3.2 6.7 2.7 6.2 3.3 9.2 4.1 3.2 7.9 3.2 7.4 2.9 10.7 5.6 8.4 3.7 4.0 8.3 3.4 8.7 '.5 11.0 5.8 7.0 3.1 5.0 7.9 3.2 6.9 2.7 8,4 4,4 5.6 2.5 6.3 7.7 3.2 8.4 3.3 8.2 4.3 7.5 3.3 8.0 8.0 3.3 8.2 3.3 8.5 4.5 9,0 4.0 10.0 8.0 3.3 11.0 6.3 3.3 11.0 4.9 12.5 8.0 3.3 9.2 3.7 6.0 3.2 11.0 4.9 16.0 5.7 2.3 7.5 3.0 5.0 2.6 8.0 3.6 20.0 4.6 1.9 5.8 2.3 6.0 3.2 8.0 3.6 25.0 5.2 2.1 6.2 2.5 '.9 3.1 5.9 2.6 32.0 4.6 1.9 '.0 2.0 4.5 2.4 5.8 2.6

40. 0 3.7 1.5 4.2 1.7 4.4 2.3 4.8 2.1 NOTE S.. (1) RRS compos>te of Run 012, channels 4, 14, 16, 23

2) RRS composite of Run f12, channels 3, 15, 17, 24

3) RRS composite of Run 0'6, channels 2, 14, 16, 23 (4 RRS composite of Run P6, channels 3, 15, 17, 24

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