ML20077G264

Evaluation of NUREG-0808 Load Definition

ML20077G264
Person / Time
Site:	LaSalle
Issue date:	07/27/1983
From:	SARGENT & LUNDY, INC.
To:
Shared Package
ML20077F909	List: ML20077F907 ML20077G264
References
RTR-NUREG-0808, RTR-NUREG-808 NUDOCS 8308030446
Download: ML20077G264 (6)

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SARGENT & LUtNDY ENGINEERS CHICAGO s

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EVALUATION OF NUREG-0808 LOAD DEFINITION LASALLE COUNTY STATION UNITS 1 & 2 COMMONWEALTH EDISON COMPANY l

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l 8308030446 830727 .

PDR ADOCK 05000373 P PDR

SARGENT & LUNDY ENGENEERS CHIC AGO A

SUMMARY

1 Scope All essential piping subsystems inside the Reactor Building were reviewed to identify those affected by the NUREG-0808 high frequency loads. A total of 21 piping subsystems were identified that were anchored to the containment in areas of maximum exceedance between the NUREG-0808 chugging load and the LaSalle design basis.

' l Design margins (both for mechanical and structural components) I were evaluated at the first two predominantly*

radial supports on each subsystem. (Table 1)

Six subsystems were selected for detailed analysis based on the following criteria:

Smallest design margin Highest first mode frequency Relatively small size -

Method of Analysis At the containment anchor location of each of the selected six subsystems, the NUREG-0808 high frequency spectra was input using the multiple-response spectra method of analysis.

Results For the six subsystems analyzed, all of the new support loads' due to the NUREG 0808 high frequency spectra are well within the design allowables of the supports. Furthermore, in four of the six subsystems, the new support loads using the NUREG 0808 spectra are not the governing load combinations

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and the oricinal design bacis suppotc loads continue to apply. (Table 2)

Conclusion Evaluation of the six subsystems indicates that the LaSalle design basis load definitions have sufficient design margins to accommodate the load revisions due to NUREG 0808 load definition. In many cases, the LaSalle design basis load definition yields support loads that are higher than the loads from the NUREG 0808 load definition.

SARGENT & LUNDY EWGINEERS CHICCGO Selection of the above six subsystems to evaluate their response is considered to be a very representative sample.

It should be noted that of the remaining 15 subsystems, 2 have no supports and for 6 subsystems, the design margins are significant and range from 1.8 to 8.5. Qualitatively, therefore, the selected sample is approximately one-half

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of the available population of subsystems and is therefore very representative. Additional evaluation is not considered necessary, This program therefore provides positive confirmation of the design adequacy of the LaSalle plant piping and supports due to NUREG 0808 high frequency excitation.

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EMD-044585

, Page 3 Subsystem

' Size Design Margins x (i.e. Number Fundamental (Ascending No. Subsystem of Data Frequency Order of Comments Points In (Hertz) Magnitude) .

the Model) (See Note 1)

1. Rill 6 64 [ 7.71 1.02 Selected Sample #1

2. RI68 132 '

4.55 1.04 Selected Sample #2

3. HP02 ~231 3.90 1.12 See Note 2 4 ." RIO2 54 11.60 1.15 Selected Sample #3

5. RH25 93 10.03 1.3 Selected Sample #4

6. RH08 462 6.06 1.4 See Note 2

7. RI72 144 6.37 1.46 See Note 2

8. RIO6 105 7.82 1.49 Selected Sample #5

9. LP02 174 9.33 1.49 Design Margin = 49%

10. RI62 30 9.45 1.55' Design Margin > 50%

11. Rill 8 102 9.76 1.65 "

'12 . RII21 40 4^.20 1.74 "

13. RI65 51 12.00 1.74 "

14. RH32 51 12.39 1.76 Selected Sample #6 (See Note 3)

15. LP61 113 7.38 1.95 Design Marain > 50%

16. LP63 50 7.26 3.52 Very Large Design Margins

17. Rill 7 119 11.80 3.87 "

18. HP62 112 9.30 5.88 "

19. RI!b e 52 7.77 8.6 "

20. RH48 - - -

No Supports

21. RH49 - - -

No Supports i

TABLE 1 SUPPORT DESIGN MARGINS

EMD-044585 Page 4 -

Note 1: Design margins shown here are the lowest of the -

calculated structural and mechanical margins where: .

Structural Margin: Allowable Load Design Load (Lowest margin calculations for:

auxiliary steel, weld, bolt, expansion anchor, embedment plate)

Mechanical Margin: Allowable Load Design Load (Lowest Margin calculation for:

bracket, weld, strut and allied mechanical components)

- Note 2: Subsystems having more than 150 nodes or 300 degrees of freedom cannot be analysed using the multiple response spectra methodology due to the program i limitation. It should be noted that the fundamental frequencies are low for these subsystems, ranging from 3.90 Hz to 6.37 Hz, and they are therefore, not expected to respond to the higher frequency excitations.

Note 3: This subsystem was selected as an additional su:agle G0 since it exhibited the highest first. mode frequency in t.he entire set of 21 subsystems.

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Restraint Info.

((d Design Combination .

Selected Margin Design Allovable Using SL Sample Restraint (See Note 1 of Load Load NUREG 0808 Within No Subsystem ID Table 1) (lb) (lb) '(1b) Allowable ?

I 1 RHi l6 RH42-2998X 1.85 148 275 139 / .

RH42-2970S 1.02 '504 512 431 /

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2 RI-68 RI43-280lS 1.33 648 865 573 /

RI39-2814S 1.04 2019 2100 1743 /

3 RIO2-2803X 1.97 886 1750 1725 /

RI-02 RIO2-2807X 1.15 1829 2100 1754 /

i 4 RH-25 RH13-2864S 1.3 6162 8000 5274 /

RH13-2860s 3.22 3222 10300 3347 /

5 RI-06 RI17-2803X 1.49 3078 4600 3593 /

RI16-2806X 1,63 1287 2100 1641 *

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1 6 RH-32 RH23-2883X 1.76 1845 3250 1706 /

RH23-2834X 2.6 2724 7000 2412 /

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TABLE 2 SUPPORT LOADS DUE TO NUREG-0808 LOAD DEFINITION i

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