ML20065B131
| ML20065B131 | |
| Person / Time | |
|---|---|
| Site: | Fermi  |
| Issue date: | 08/13/1982 |
| From: | Lehnert R, Roberts C NUTECH ENGINEERS, INC. |
| To: | |
| Shared Package | |
| ML20065B128 | List: |
| References | |
| DET-15-022, DET-15-022-R00, DET-15-22, DET-15-22-R, NUDOCS 8209140264 | |
| Download: ML20065B131 (9) | |
Text
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DET-15-022 Revision 0 August 1982 Responses to NRC Questions on the Enrico Fermi Atomic Power Plant Unit 2 Plant Unique Analysis Report Prepared for:
Detroit Edison Company Prepared by:
NUTECH Engineers, Inc.
San Jose, California Approved by:
Issued by:
_ _ kl R.
A.
- Lehnert, P.E.
C. W.
Roberts Engineering Manager Project Director DET-15-022 Revision 0 Ilkjkk)() I 8209140264 820909 PDR ADOCK 05000341 A
PDR a
Question 13 PUAR Section 2.2.2.1 (Page 2.2-30), AC Section 2.3 and 2.4.
Additional information is required concerning the torus shell pressures presented in Table 2-2.2-3 on page 2-2.48 of the PUAR.
Provide the details of a specific torus shell pressure calculation at the two times speci-fied in the table for a typical longitudinal location as a function of circumferential location (e. g., Z/.
=0, 0 = 180, 150, 120, and 90 degrees).
The following in-formation should be included as part of the response with and without the margins imposed by NUREG-0661.
(a) Net torus vertical load history.
(b) Average submerged pressure history.
(c) Torus airspace pressure history.
Illustrate hcw these pressure histories are used in conjunction with the Load Definition Report (LDR) multi-pliers to arrive at the values presented in the table.
Respgnse_to_ Question 13 As discussed in the response to Question 14, the transient structural analysis of the Fermi 2 suppression chamber for pool swell loads is performed using net pressure loadings which are obtained by subtracting the airspace pressure transient from the submerged pressure transient.
The net pressures used in the structural analysis include the mar-gins imposed by NUREG-0661.
PUAR Figure 2-2.2-8 shows an example of a resulting net pressure transient used in the analysis.
The attached Table 13-1 provides additional information to clarify PUAR Table 2-2.2-3.
Table 13-1 shows the torus shell pressure values used in the Fermi 2 structural analysis which were calculated in accordance with NUREG-0661 requirements.
The bases for the values in Table 13-1 and PUAR Table 2-2.2-3 are described in the following paragraphs.
The sample pressure values shown in PUAR Table 2-2.2-3 were obtained by taking the net pressure loads used in nute_q"h DET-15-022 Revision 0
the structural analysis of the suppression chamber including the NUREG-0661 margins, and adding the torus airspace pressures obtained directly from the PULD curves without NUREG-0661 margins.
For ease of review, the pressures shown in Table 2-2.2-3 were reported at the same longitudinal locations as the locations at which the Load Definition Report (LDR) longitudinal multipliers are specified.
The LDR specifies values at five Z/t locations for calculating longitudinal multipliers.
Intermediate values used in the Fermi 2 analysis are obtained by interpolating and enveloping the LDR values.
Each longitudinal multiplier is conservatively applied over a range of Z/Z values.
Table 13-1 shows torus shell pressure components which include all the NUREG-0661 margins.
Table 13-1 also shows locations at which the LDR longitudinal multi-pliers were obtained and the range over which each multiplier was applied.
A description of how the values in Table 13-1 were obtained is provided in the following paragraphs.
The average submerged pressure time-history, the torus airspace pressure time-history, and the net torus vertical load time-history without the margins imposed by NUREG-0661 are given in Fermi 2 PULD Figures 4.3.2-2, 4.3.2-4 and 4.3.1-2, respectively.
The pressure values at the time of peak download (t = 0.3 sec) and at the 0.54 sec) are given in the time of peak upload (t
=
attached Table 13-2.
The net torus load pressures shown in Table 13-2 are calculated by subtracting the airspace pressure values from the average submerged pressures.
The average submerged oressures and the torus airspace pressures with the NUREG-0661 margins applied are pro-vided in the attached Table 13-3.
For the download, a N
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margin of 10% of the' net torus vertical pressure was conservatively applied.
For the upload, a margin of 21.5% was applied as required by NUREG-0661.
The download margin is applied to the average submerged pressure curve during that portion of the time-history when a net download is acting on the torus, while the upload factor is applied to the torus airspace pressure curve during that portion of the time-history when a net upload is acting on the torus.
Torus shell pressures for a typical longitudinal location (Z/2 = 0.552) are shown in the attached Table 13-4.
As shown in this table, local pressures at each circumfer-ential location are calculated using the relationship
)'M avg' M*
- "O.
The pressures (P loc z
y obtained by subtracting the airspace pressure from the average submerged pressure, as shown in Table 13-3.
The pressure values shown in Table 13-4 are the same as in Table 13-1.
Table 13-1 provides additional information to clarify PUAR Table 2-2.2-3 and shows the net pressures used in the structural analysis which includes the margins imposed by NUREG-0661.
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Table 13-1 TORUS SHELL PRESSURES DUE TO POOL SWELL AT KEY l
TIMES AND SELECTED LOCATIONS 0
g yL 6
x 5
m
~
~
270 --
~~ 90 L
~ Z/L I
o 180 0.0 0.5 1.0 Key' Diagram Longitudinal Location (Z/1)
Torus Shell Pressure (psi:
cuperenda L cation (6)(deg{,
Longitudinal Applicable Peak D wnloac Peak Upload Factor Range Lecarion (t=0.30 sec)
(t=0.54 sec) 0.000
.361 180 10.7 3.6 Maximum at 0.000
.361 150,210 9.7 3.4 0.000 -.361 120,240 6.0 2.4 0.0 or 0.361 0.000 -.361 0-90,270-0 0.3 7.5 0.361
.500 180 11.6 4.0 Factor 0.361
.500 150,210 10.5 3.8 Interpolated 0.361
.500 120,240 6.5 2.9 at 0.50 0.361
.500 0-90,270-0 0.3 7.5 0.500
.640 180 11.9 4.0 0.500
.640 150,210 10.8 3.9 0.552 0.500
.640 120,240 6.5 2.9 0.500
.640 0-90,270-0 0.3 7.5 4
Factor 0.640
.810 180 12.4 4.1 Interpolated 0.640
.810 150,210 11.2 3.9 at 0.724 0.640
.810 120,240 6.9 3~. 0 0.640
.810 0-90,270-0 0.3 7.5 0.810 - 1.0 180 13.0 4.1 0.810 - 1.0 150,210 11.7 4.0 0.810 - 1.0 120,240 7.2 3.1 0.810 - 1.0 0-90,270-0 0.3 7.5 DET-15-022 QUkg(b Revision 0 f
Table 13-2 Presssures at Time of Peak Download and Peak Upload Without NUREG-0661 Margins Average Airspace Net Torus Submerged Pressure Load Pressure Time Pressure P
(psi)
P (psi) a net P
(psi) ava Peak Download 8.8 0.3 8.5 (t = 0.3 sec)
Peak Upload 3.6 6.8
-3.2 (t = 0. 54 sec)
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Revision 0 Table 13-3 Pressures at Time of Peak Download and Peak Upload with NUREG-0661 Margins Average Submerged Airspace Af"f#f*lua o
a ng Time Pressure Pressure Local Pressures (psi)
(Pavg) M (Psi)
(Pa) g (psi)
(Pava. ) M=(Pava} M-(P h a
Peak Download 8.8 + 0.1 x 8.5 0.3 9.3 (t = 0.3 sec)
= 9.6 Peak Upload 3.6 6.8 + 3.2 x 0.215
-3.9 (t = 0.54 sec:
=7.5 (1)
At the time of peak download (t = 0.3 sec)
(P
)M =P
+ 0.1 x P y
avg et (2)
At the time of peak upload (t = 0.54 sec)
(P )M "
+ 0.215 x P a
a et DET-15-022
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Table 13-4 Torus Shell Pressure Calculations Due to Pool Swell for a Typical Longitudinal Location (Z/1 = 0.552)
Circumferential L cal Pressures Local Pressures Time Factor Factor P
Location (2) psU (sec)
M M
Airspace Z
G Ploc (Pavg} b z b Pressure (esi)
(0)
(deg) 180 0.30 1.040 1.205 11.6 11.9 180 0.54 0.996 0.908
-3.5 4.0 150,210 0.30 1.040 1.083 10.5 10.8 150,210 0.54 0.996 0.940
-3.6 3.9 120,240 0.30 1.040 0.638 6.2 6.5 120,240 0.54 0.996 1.186
-4.6 2.9 0.3 0.3 0-90, 270-0 0.30 0-90, 270-0 0.54 7.5 7.5 (1)
For circumferential locations, see PUAR Table 2-2.2-3.
(2)
These factors are taken from the LDR, Table 4-3.2-1.
DET-15-022 Revision 0 L
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Question 14 PUAR Section 2-2.2.1 (Page 2-2. 30), AC Section 2. 3 and 2. 4.
Describe in detail how the peak download and peak upload values presented in Figure 2-2.2-8 on page 2-2.65 of the PUAR were determined.
Provide any additional information required to duplicate these results which has not already been requested above.
In addition, describe _how this transient is used in the dynamic analysis of the torus shell loads.
Response to Question 14 s
The values presented in PUAR Figure 2-2.2-8 are for the mitered joint location (Z/E = 0.5) and at bottom dead center (0 = 180 ).
For a given location, the maxin,um and minimum values are obtained at the timcs of peak download and upload (t = 0.3 and 0.54 sec) by subtracting airspace pressures from the local submerged shell pressures.
For example, at Z/1 = 0.552 and 0 = 180 (See Table 13-4 in the response to Question 13) :
Peak Download = 11.9 - 0.3 = 11.6 psi Peak Upload = 4.0 - 7.5 = -3.5 psi The factor M at Z/t = 0.552 is conservatively applied over the range of Z/E values from 0.5 to 0.64.
Therefore, the local pressure values at Z/E = 0.5 shown in PUAR Figure 2-2.2-8 are the same as the values at Z/2 = 0.552.
Pressure time-histories, such as the one shown in PUAR Figure 2-2.2-8, are calculated at 50 submerged torus shell locations in a 1/16 segment of the torus shell.
These time-histories are used in performing a transient dynamic analysis of the torus using the methods discussed in Section 2-2.4.1 of the PUAR.
The airspace pressure with the NUREG-0661 margin is applied statically to the entire torus shell and added to the dynamic response to obtain the total response of the suppression chamber due to pool swell.
DET-15-022 Revision 0 nute,Eeh