ML20076C385

Rev 1 to Mark I Long-Term Plant-Unique Analysis

ML20076C385
Person / Time
Site:	Peach Bottom
Issue date:	08/31/1983
From:	BECHTEL GROUP, INC.
To:
Shared Package
ML20076C367	List: ML20076C365 ML20076C385
References
NUDOCS 8308220339
Download: ML20076C385 (13)

Text

.- _ __ - ____-_ __.-- .- _- .

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l PEACH BOTTOM ATOMIC POWER STATION UNITS 2 AND 3  ;

i MARK I LONG TERM PROGRAM PLANT UNIQUE ANALYSIS DOCKET NUMBERS: 50-277 AND 50-278 PREPARED FOR PHILADELPHIA ELECTRIC COMPANY 1

BECHTEL POWER CORPORATION SAN FRANCISCO, CALIFORNIA REVISION 1 AUGUST 1983 gggeggggg9,gggggg, p PDR

- _ ~ _ . _ _ _ - _ - . . - _ _ .

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Table 7-1 J

. VENT SYSTEM FREQUENCIES i

1 Mode Frequency (liz) l I i

.j i

I 1 8.03 i 1

l 2 11.02 r 1

1 >

4 3 11.07 <

l  :

{ 4 13.31 [

r  !

4 5 13.64 6 13.87 7 14.16

! 8 14.47  !

9 14.87 i

l 10 17.09 1

w.

4 t

b i

l i

1 T1002677-DIS 7-17 4

1 I

. . . - . . . . - - . . . _ _ _ - . _ _ . . , -- - -_..._,-.,._. _ ~ , . . - - . . - - _ - . - . _ _ . _ . - - - . _ - - - - _ _ . . . -, . _ _ - . _ . _ . . , . . . _ . . . _ _ . . . _ - .

Table 7 2 RESS EvhLUATION AT KEY LOCATIONS SERVICE LEVEL A

[ VENT HEADER SUPPORT C. BAY l IIST DOWNCOMER 3RD DOWNCOMER PAIR 2ND DO OMER PAIR '

i i Y ] [(; '

'e s 7,' - ,

( C VENT PIPE Calculated Allowable 9I SI Location Stress Type oci) (ksi) Fatio Intersection between header and D/C 1 (A)

P 28.33 37.70 0.75 lO P

+Pb+Q 50.26 58.00 0.87 Intersection between P 8.01 37.70 0.21 l header and D/C 3 (B)

P

+Pb+Q 38.30 58.00 0.66 Intersection between P b

10.37 29.00 0.36 header and vent (C)

P

+Pb+Q 10.64 58.00 0.18 Main vent (D) P g 3.14 19.30 0.16 P +P b

3.34 29.00 0.12 P

+Pb+Q 3.68 58.00 0.06 lhader between D/C 1 P 10.08 19.30 0.52 ond D/C 2 (E)

P +P 13.76 37.70 0.36 b

P

+Pb+Q 23.20 58.00 0.40 0

T1002677-DIS 7-18

% Table 6-3 DESIGN CASE TORUS PRESSURES AND FREQUENCY RANGES

• Peak Pressure Frequency Range Load Case (psid) (Hz)

A1.1 6.67 4.09 to 8.49 A3.1 6.67 4.09 to 8.49 A1.3 6.51 4.11 to 8.18 A1.2/A2.2/A3.2 7.53 6.25 to 11.63 C3.1 6.67 3.80 to 10.18 C3.2 7.53 5.31 to 13.49

• Calibration and multiple valve factors not included.

T1002677-DIS 6-29

(

Table 6-4 TORUS FRCQUENCIES Frequency (Hz)

No. Dry Structure Coupled Structure 1 17.35 14.28 2 17.90 15.08 3 22.41 15.75 4 22.53 16.27 S 23.15 17.58 6 23.48 17.93 7 27.02 18.19 8 27.56 20.35 l

9 28.68 20.78 10 29.70 21.32 O

T1002677-DIS 6-30

.~.; . - . ---. - ._.._ =.-.-- ~ .. . - . _ . - _ . . .

1

flow rate. Each of the three phases imparts distinctly chara<<aristic f

( dynamic pressures on the shell. The origin and methods of calculating plant unique loads are discussed in detail in the LDR. The plant unique I

loads are summarized here.

6.2.2.1 Pool Swell Loads l During a postulated LOCA, the torus shell is subjected to two types of i

pressure transients: (1) submerged pressure transients caused by the downward pressure of water on the wetted area of the torus shell and (2)

I torus air space pressure transients caused by compression of the air space above the pool surface.

i j The definition of these two types of torus shell pressure transients was based on test data obtained from the Quarter Scale Test Facility (QSTF) and the 1/12 Scale Test Facility. The methodology used for applying the test

i

data to this analysis is described in Reference 11. Plant unique test data and test results for specific loading conditions are contained in Reference l 18. The test results were based on a two-dimensional model. Additional margins were incorporated to account for three-dimensional effects. These j

adjustments to the test results were based on empirical scale factors.

I Different scale factors were applied to the download phase and the upload phase of the transient.

I 6.2.2.2 Submerged Pressure Transients The basis for the definition of submerged torus shell loads is the " average submerged pressure." The average submerged pressure is the " base" pressure used in determining the pressure history at any submerged point in the torus shell. This is plant unique and is based on QSTF and 1/12-scale test 4

results. Figure 6-13 shows the plant unique average submerged pressure transient for Peach Bottom Units 2 and 3. These QSTP average pressures are i

adjusted by margins based on empirical relations defined in Reference 11.

I This additional margin works out to be 21.2% of the net download for the download phase of the transient.

s T1002677-DIS 6-5 7

e aem--- -r.-# ww y- 1 w , - . - , , - = ,

6.2.2.3 Air Space Pressure Transients The torus air space pressure transients are also based on QSTP tests. The plant unique pressure transient for this portion of the torus shell is shown in Figtce 6-14. The magnitude of the QSTF pressure transient for the upload phase was increased by an additional margin of 31.5% of the net upload. The upload additional margin was applied only to that portion of the transient representing the upload phase, starting from the beginning of the upload phase to the end of the transient.

Figure 6-15 shows the adjusted pressure transients in the wetted surface and air space.

6.2.2.4 CO and Chugging Loads CO and chugging loads are cyclic in nature whereas the pool swell load is a transient. Plant unique CO and chugging loads are defined in the LDR.

6.2.3 SRV Discharge Loads SRV discharge loads on the torus are transient pressures on the submerged portion of the shell. The SRV discharge phenomenon is briefly described in Section 3. The method of defining the SRV 31scharge load is given in the LDR. It provides two alternative methods of calculating torus shell loads.

They are:

(a) Calculation of shell pressures using the General Electric program QBUBS (b) Calculation of shell pressures using in-plant SRV test data.

For Peach Bottom, the latter method was used. A detailed test program was conducted in Peach Bottom Unit 2 after the quenchers were installed. Shell pressures and structural responses were measured. The General Electric fluid model QBUDS which calculates the torus shell pressures was calibrated to calculate interface shall pressures. The calibrated progr- was then T1002677-DIS 6-6

f N Table 5-3 GOVERNING LOAD COMBINATIONS FOR VENT HEADER PENETRATION Column No. in Combination Service Table 5-1, No. Level Load Combinations Ref 14 1 A N+SRV +IBA/SBA (P +T +R ) +0BE 12

+2 A N+SRV +IBA/SBA (P +T +R )g+CH+OBE 14

+ 3* A N+DBA(R )+PS+0BE 18

+4 A N+DBA(P3 +R 20 A +T )+CO+0BE 5 C N+SRV +IBA/SBA (P +T g+R ) +CH+SSE 15 6 C N+SRVs +DBA(R )+PS+SSE 25 7 C N+DBA (Pg +R +T ) +CO+SSE 27 7 ~)

%)

• (a) Evaluation for fatigue and primary plus secondary stress range is not required.

(b) For the pool swell impingement region of the vent system, allowabic stresces may be increased to service Level C.

+ (a) For local membrane stress intensity and priraary membrane plus bending stress intensity, the S values may be increased to 1.3 S,.

/'~'1 t  !

'% /'

T1002677-DIS 5-7

Table 5-4 GOVERNING LOAD COMBINATIONS FOR INTERNAL SUPPORTS Column No. in Combination Service Table 5-1, No. Level Load Combinations Ref 14 1 A N+SRV +IBA (P +T +R ) +CH+0BE 14 2 A N+DBA (R ) +PS+OBE 18 3 A N+DBA (P +T + R ) +CO+0BE 20 4 C N+SRV +IBA(P +T +R )+CH+SSE 15 5 C N+SRV +DBA (R )+PS+SSE 25 6 C N+DBA (P +T +R ) +CO+SSE 27 O

O T1002677-DIS 5-8

i

! ILLUSTRATIONS (Cont'd) f]

Figure Page 7-7 Vent System Thrust Loads 7-29 7-8 Pool Swell Impact Loading Sequence 7-30 7-9 Typical Local Pressure Transient 7-31 7-10 Finite Element Model of the Vent and 7-32 Ring Header 7-11 Additional Vent System Details 1-33 7-12 Finite Element Model of Downcomers 7-34 7-13 Computer Plot of Vent System 22.5* Finite 7-35 Element Model i l

7-14 Downcomer CO. Load Application 7-36  !

7-15 Deformation Due to Unit Vertical Loads 7-37 7-16 Radial Displacement Due to Uniform Internal 7-38 Pressure 7-17 First Mode Shape for Cross Section Through Ring 3 7-39 7-18 Second Mode Shape for Cross Section Through Ring 3 7-40 7-19 Third Mode Shape for Cross Section Through Ring 3 7-41 7-20 First Mode Shape for the Plan View at Downcomer Tips 7-42 7-21 Second Mode Shape for the Plan View at Downcomer Tips 7-43 7-22 Third Mode Shape for the Plan View at Downcomer Tips 7-44 7-23 Principal Stresses at Downcomer/ Vent Header 7-45 Intersection for Pool Swell 7-24 Vent Header Support Outside Column Reaction for 7-46 Pool Swell Loading.

B Plan of Catwalk,_ Monorail, and Spray Header 8-26 8-2 Catwalk Modifications 8 8-3 Monorail and Spray Header Support Modifications 8-28 V

T1002677-DIS xiii'

ILLUSTRATIONS (Cont'd)

Figure Page 8-4 RER Elbow and Support 8-29 8-5 Modifications to HPCI Turbine Exhaust Pipe 8-30 Support 8-6 Modifications to RCIC Turbine Exhaust Pipe 8-31 l Support l l

I 8-7 Vacuum Breaker Drain Line Supports 8-32 8-8 Torus Plan Showing Location of Thermowell 8-33 Assembly 8-9 Section and Detail for Thermowell Assembly 8-34 8-10 Modifications to Instrument Air Line 8-35 8-11 Arrangement of Electrical Canister 8-36 O

T1002677-DIS xiv

CONTENTS (Cont'd) i Page 8 STRUCTURAL EVALUATION OF TORUS INTERNAL STRUCTURES 8-1 8.1 Description of Structures and Modifications 8-1 8.2 Loads 8-9 8.3 Allowable Stresses 8-12 8.4 Structural Evaluation 8-15 9

SUMMARY

AND CONCLUSIONS 9-1 REFERENCES R-1 i

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l f

l l

l T1002677-DIS ix i

-. _ . _ _ , , _ _ - _ . . - _ 4

ILLUSTRATIONS Figure Page O

2-1 Peach Bottom Containment Configuration 2-9 2-2 Plan of Torus 2-10 2-3 Cross Section of the Torus 2-11 2-4 Plan of Vent System 2-12 2-5 Plan of Unit 2 Torus Penetrations 2-13 2-6 Plan of Unit 3 Torus Penetrations 2-14 2-7 Return Line Routings Inside Torus 2-15 6-1 Pictorial View of T-Quencher and supports 6-38 6-2 Pictorial View of the Column Tie Down 6-39 6-3 Pictorial View of the Torus Showing Stiffeners 6-40 and Thermowells 6-4 Pictorial View of the Torus Nc:rzle Reinforcement 6-41 6-5 Cross Section Showing Major Modifications 6-42 6-6 Plan of Torus Showing the Location of SRV Quenchers 6-43 6-7 SRV Discharge Lines and Supports Inside Torus 6-44 6-8 T-Quencher Support System 6-45 6-9 Typical Torus Tie Down 6-46 6-10 Shell Stiffeners 6-47 6-11 Typical Nozzle Reinforcement 6-48 6-12 liorizontal Seismic Response Spectrum (OBE) 6-49 6-13 Average submerged Pressure 6-50 6-14 Torus Air Pressure 6-51 6-15 Adjusted Pool Swell Pressure Transients 6-52 6-16 Locations of Pressure Gages 6-53 O

T1002677-DIS x