ML20132C706

Reanalysis of RHR Line W/Energy Absorbers as Replacements for Hydraulic Snubbers

ML20132C706
Person / Time
Site:	Peach Bottom
Issue date:	07/25/1985
From:	BECHTEL GROUP, INC.
To:
Shared Package
ML17150A278	List: ML20132C697 ML20132C706 ML20132C717
References
NUDOCS 8507300432
Download: ML20132C706 (18)

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ENCLOSURE 1 REANALYSIS OF RHR LINE WITH ENERGY ABSORBERS AS REPLACEMENTS FOR HYORAULIC SNUBBERS FOR THE PEACH BOTTOM ATOMIC POWER STATION PREPARED BY BECHTEL POWER CORPORATION FOR PHILADELPHIA ELECTRIC COMPANY B

G 8507300432 850725 PDR ADOCK 05000277 P

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ENCLOSURE 1 REANALYSIS OF RHR LINE WITH ENERGY ABSORBERS AS REPLACEMENTS FOR HYDRAULIC SNUB 8ERS SYSTEM DESCRIPTION Original Configuration with Snubbers:

Isometric P-10-3 was analyzed for hydrodynamic loads. To qualify the system for the hydrodynamic loads, modifications were made to slightly reroute a 6-inch line, reinforce a tee connection, and provide pipe support modifi-cations. The modified system was qualified for Mark I loads and requalified for seismic loads using the original plant seismic design criteria.

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The attached isometric depicts the system as finally nodified.

It inclules six snubbers, most of which are seismic supports. The snubbers are S-43 (two snubbers), S-44, S-48, S-49, and S-91.

Figure 1 is a computer plot showing the relative locations of these snubbers.

Revised Configuration with Energy Absorbers:

Figure 2 is a computer plot showing the revised support system for Isometric P-10-3 using energy absorbers.

It indicates that the six snubbers were re-placed with energy absorbers at the same locations and orientations with the exception of snubber S-91.

For S-91, the replacement energy absorber was relocated in the vicinity of spring hanger H-94A.

This relocation allowed the replacement absorber to provide higher camping in the vertical direction.

4 1

ANALYSIS PERFORNED Hydrodynamic and Themal Analysis The configuration modified with energy absorbers was reanalyzed for all load cases for which it had been previously q. alified. For all hydredynamic loads, u

the energy absorbers wert modeled as linear spring elements with a stiffness equal to the elastic spring rate of energy absorbers because the resulting movements are lower than the yield displacements. For thennal analysis, all thernal modes were reanalyzed using the energy absorber elastic spring rates.

Seismic Analysis The seismic design basis for Peach Bottom is based on an analysis for a two-directional earthquake (maximum of X+Z or Z+Y responses),1/2% damping coefficient, SRSS modal combinations, and an application of a response spectrum curve representing the location where the majority of the system is located. This is also the basis of the system analysis of the snubber con-(

figuration. The response spectrum applied was for elevation 135'.

The seismic reanalysis of this systen with energy absorters was performed using the plant seismic design basis except that an envelope of all response 1

spectra was used and applied to all locations at which system supports and anchors exist. This was done as an added neasure of conservatism and to demonstrate the system's capability to accorriodate higher seismic input notions. The spectra were thus an envelope of the levels 135' and 165' floor spectra. This represents an increase of peak accelerations at 1/2% damping by a factor of two over those in the design basis.

To demonstrate the system's capacity with energy absorbers for higher and more stringent seismic analysis rules, an additional analysis was perfomed with j

the Regulatory Guide 1.92 closely spaced modal combinations method using the

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enveloped spectra and assuming a concurrtnt X+Y+Z earthquake. This second 2

analysis was performed primarily to prove the added capacity of energy absorbers for controlling the system response under bigger seismic excita-tions. This, of course, is expec.ted since higher seismic responses cause the energy absorbers to add yet higher damping to the system. Thus, the overall system response stabilizes and approaches asymptotic values. This cannot be achieved if the system is supported only.by snubbers and rigid supports.

SUPNARY OF RESULTS Table 1 compares the results of the safe shutdown earthquake (SSE) load case for the existing design with the results of the reanalysis using energy absorters. The comparison shows that although the reanalysis with energy absorbers uses a more severe response spectra, virtually all of the signif-icant results art better than for the snubber design basis.

Table 2 shows the stress sumary sheet for all applicable load combinations for the existing design basis case (with snubbers). Table 3 shows the same information for the energy absorber case. Table 4 gives the snubber case

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support load sumary. Table 5 shows the support load sunriary for the energy absorter case.

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Computer Plot Showing Revised Support System Using Energy Absorbers 5

l Table 1 Lead Case SSE Comoarison Snubber Case Energy Absorber

• Item Compared

[Desion Basis 3 Case Fundamental Frequency 1.1 Hz 1.9 Hz Damping Ratio 0.5%

0.5% - 9%

Max. Stress (SSE) 16 kai 12 kai M2x. Valve Acceleration 1 G 1.1 G 1

Max. Nozzle Loads 1

1 Max. Displacement (Dy) 2.2 in.

1.5 in.

Sucoorts:

Total No. of Supports -

(not including springs) 24 24 Total No. of Snubbers 6

O Total No. of Energy Absorbers O

6 Max. Support Load (SSE) 14 kips 14 kips Max. Snubber /EA Loads 6 kips 4.4 kips Total Load into B1dg.

111 kaps 79 kips Based of X+Y, Y+Z earthquakes, 1/2% damping, SRSS modal combinations, and envelop of ftoors 135 fest, and 165 fest spectra.

6

Table 2 MARK I PlPING STRESS

SUMMARY

CHECK AND COVER SHEET ASME SECT. lit, CLASSES 2 Si 3 (ESSENTIAL PIPING)

PROJECT: PEACH OOTTOM ATOMIC POWER STATION -UNITS 2 AND 3 NO. OF SHEETS jog NO.11187418 PLANT DESIGN GROUP RHR SYSTEM:

CALC. NO.

ISO NO.

P-10-3 REV NO.

DESIGN LOCATION MAXIMUM ALLOWABLE PUAAG - NEDO 24

• 1 OF MAX.

LOADING CONDITION' COMPUTED STRESS CHK C

TI0 RF ASLE 5 PAR A. R EF.I PIPE STRESS STRESS (PSI)

(PSI)

STRESS. COM8.

SUSTAINED f)ESIGN PRESS. ATMtG 5,065 SYSTEM WElGHT & SUSTAINED 4.387

[Sy EON.s MAXIMUM SUM 9,452 15,000 W+P 430 2,226 6 91 PE AK PRESS. AT psia COLUMN 1 WEIGHT & SUSTAINED 83 1.2 Sh ISR I HR l ALL 13,152 691 -691 A W+P+5RVall SUM 15.461 18.000 SYSTEM PEAK PRESS. AT 430 PSIG 4,840 gj, 1.2 S WEIGHT & SUSTAINED 4.387 h

OsE 6,375 W + P + OBE MAXIMUM SUM 15 107 1A 000 PE AK PRESS. AT430 PSIG 4.840 COLUMN 2 SYSTEM WElGHT & SUSTAINED 4.387 j,g g (SRV OISCHARGE) Att 13,188 e

Ost 6,375 W+P+

MAXIMUM SUM 23.975 27.000

/08E2+ SRV(11 OCCASIONAL PE AK PRESS. AT.41Q.PSIG 4.840 LOADS

[NC.3811.2 SYSTEM WElGHT & SUSTAINED 4,387 CON M 3,g gh (C)(2).

(SRV DISCHARGE) Att 13,1 gg N

2.2)

C.O. OR CH. FROM SSA 4.816 W+P+

g MAXIMUM SUM 23,267 27,000

]SRV'33H' C

g SYSTEM PEAK PRESS. AT430 PSIG 4.84 0 WElGHT & SUSTAINED 4,387 COLUMN 15 (SRV DISCH ARGEl ggg 11,19o 2.4 S h SSE 12.031 W+P*CH+

Z 2

l C.O. OR CH. FRO 61ISA 4,816

,SSE + SRV,]

MAXIMUM sum 31,894 36,000 PEAM PRESS. AT 430 PSIG 4,840 SYSTEM WalGHT & SUSTAINED 4.387 COLUMN 25 (SRV DISCHARGE l ONg 6.594 2.4 Sh SSE 12,031 y,p,$py.

POOLsWELL 9,94 2 ong

/SSE4+PS4, MAXIMUM SUM 31.428 36.000 PtAM PRESS. AT 430 PSIG 4.930 COLUMN 27 WilGHT & SUSTAINED 4,3R7 l

1 2.4 S (SAV DISCHARGE) ONg h

888 12.031 N'E'

,1 C.O. OR CH. F ROM DSA R 894

]SSEl+ COT R

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o MAXIMUM SUM 24,189 36.000 01333A RC 4/tMt (CONTINUED ON REVERSE SIDE) 7 L

Table 2 (Continued)

MARK I PIPING STRESS

SUMMARY

CHECK AND COVER SHEET ASME SECT. Ill, CLASSES 2 0 3 (ESSENTI AL PlPING) CONTINUED j

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PUAAG - NEDO f

I DEslGN LOCATION

• MAXIMUM ALLOWABLE 24 11 OCT 1 C

IT OF MAX.

LOADING CONDITION COMPUTED STRESS CHK pp gE5 PIPE STRESS STRESS IPSI)

(PSI)

STRESS COMS PAR A. REF.)

THE RMAL EXP THERMAL E XPANSION 19.026 3

N/A A

[NC 3411.2 iC) 730 ANCHOR MOVEMENTS

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bg'b"N 1 728M-730 sum 19,026 22,500 M

DESIGN PRESS. AT PSIG NS N WEIGHT & SUSTAINED SA*Sh N/A INC 3611.2 IC) 121 THERMAL EXPANSION

)Eb ANCHOR MOVEMENTS SUM

'EITHER EOUATION 10 OR 11 MUST BE MET

SUMMARY

NAME SIGN ATURE DATE e

3 P.7EPARED BY f

CHECKED BY

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APPROVED BY o 1232s ac seio.st 8

Table 3 MARK I PIPING STRESS

SUMMARY

CHECK AND COVER SHEET ASME SECT. lil, CLASSES 2 0 3 (ESSENTIAL PIPING)

PROJECT: PEACH BOTTOM ATOMIC POWER STATION - UNITS 2 AND 3 NO. OF SHEETS JOS NO.11187415 PLANT DESIGN GROUP SYSTEM:

RHR CA LC. NO.

180 NO.

P-10-3 REV NO.

DESIGN LOCATION MAXIMUM ALLOWABLE PUAAG - NEDO 24 C

I OF MAX.

LOADING CONDITION COMPUTED STRESS CHK ET I R F TABLE 5 PAR A. REF.)

PIPE STRESS STRESS (PSI)

(PSI)

STR ESS. COMS.

l SUSTAINED DESIGN PRESS. AT3PSIG 5065 l

8 SYSTEM b

WElGHT & SUSTAINED 4387 EON. 8 MAyfMllM SUM 9452 15.000 W+P 430 PSIG 2226 691 PEAK PRESS. AT COLUMN 1 WEIGHT & SUSTAINED 691-691 A (SRV DISCHARGE) Att 13,152 W+P+5RVall sum 15.461 18.000 PEAK PRESS. AT 430 PSiG 4840 N/A SYSTEM WElGHT & SUSTAINED 4387 1.2 Sh OsE 6423 MAXIMUM SUM 15.650 18.000 W+P+0BE PE AK PRESS. AT 430 PSIG 4840 SYSTEM WEIGHT & SUSTAINED 4387 1.s S COMN 2 h

(SRV DISCHARGE) Att 13,188 OBE 6423 W+P+

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MAXIMUM sum 23,996 27,000 QOBE' +5RVj 3 3 l

OCCAllONAL LOADS PEAK PRESS. AT 430 PSlo 4840 (NC.M11.2 SYSTEM WElGHT & SUSTAINED 4387 COLUMN 11 b

(C) (2),

ISRV DISCHARGE) Att 13,j gg C.O. OR CH. FROM SSA 4816 W+b j

EM52.2]

E ON. 9 MAXIMUM SUM 23,267 27,000 iSRV'33 ) + CH' PEAK PRESS AT 430 PSIG 3655 COLUMN 15 575 WElcHT & SUSTAINED 1293

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ISRV DISCHARGE) Att 5016 2.4 Sh 88E 18.797 W+P+CH +

YSSE+3py28))

2 C-

" CH FM "18A 21 6 570 575 SUM 23.609 36.000 PEAK PRESS. AT 430 pSiG 3655 575 WElGHT & SUSTAINED 1293 COLUMN 25 (SRV DISCHARGE) ONE 2508 2.4s

• h SSE 18,797 POOLSWELL 1316 2

2 570 575 YSSE.3py SUM 25.218 36.000 one PEAK PRESS. AT 430 PSlo 4840 COLUMN 27 WElGHT & SUSTAINED 4397 f

2.4 s (SRV DISCH ARGE) ogg h

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SSE Jg,797 W*E' y

C.O. OR CH. FROM DSA gg 94 H

E MAXIMUM SUM 30,022 36,000 3 3 " " "

(CONTINUED ON REVERSE $1DE) 9

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Table 3 (Continued)

MARK I PIPING STRESS

SUMMARY

CHECK AND COVER SHEET ASME SECT.111, CLASSES 2 0 3 (ESSENTIAL PIPING) CINTINUED PUAAG - NEDO DESIGN LOCATION MAXIMUM ALLOWA8LE 2#

C TION OF MAX.

LOADING CONDITION COMPUTED STRESS CHK RF ABLE 5 g

PIPE STRESS STRESS (PSI)

(PSI)

STR ESS. COMB.

e AR A. R EF.I THERMAL EXPANSION 19,026 THERMAL EXP S

N/A 730 A

INC.3611.2 (C)

ANCHOR MOVEMENTS (2). NC-3452.31

• E ON.10 728M-730 Suu 19,026 22,500

{M DESIGN PRESS. AT PSIG S N WEIGHT & SUSTAINED SA*Sh N/A

[NC 3611.2 (Cl (2).

THERMAL EXPANSION I

'I ANCHOR MOVEMENTS EO SUM

• EITHER EQU ATION 10 OR 11 MUST BE MET

SUMMARY

NAME SIGN ATUR E DATE e

3 PREPARED BY f

CHECKED BY APPROVE D BY P 13332 KC 6/10,81 10

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