ML16341E168
| ML16341E168 | |
| Person / Time | |
|---|---|
| Site: | Diablo Canyon  |
| Issue date: | 03/25/1987 |
| From: | Schierling H Office of Nuclear Reactor Regulation |
| To: | Novak T, Rossi E, Varga S NRC |
| Shared Package | |
| ML16341E166 | List: |
| References | |
| NUDOCS 8704240142 | |
| Download: ML16341E168 (14) | |
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UNITED STATES NUCLEAR REGULATORY COMMISSION WASHINGTON, D. C. 20555 4 Cle5 kl'C Z Docket Nos.
50-275/323 NOTE TO:
FROM:
SUBJECT:
T. Novak E. Rossi S.
Varqa R. Ballard L. Chandler D. Jeng H. Schierling DIABLO CANYON MULTIRACK ANALYES c.
C, In a phone call on Monday (3/23/87)
PGSE (M. Tressler, K. Singh et al.
informed us (H. Ashar, H. Fishman (FRC),
G.
DeGrassi (BNL), myself) that they had completed the analyses requested by our letter of February 26, 1987.
The results are being evaluated by PG&E and a formal submittal to us is planned for late next week.
PGSE briefly described to us the analyses performed, for both single rack and multirack configurations:
1.
Single rack, 2D, 4 degrees of freedom (rocking, vertical, horizontal, fuel assembly interactions),
out-of-phase, infinite
- distance, high spring constants.
2.
Same as 1 except 74" distance and realistic spring constants
( lk times calcula ted value).
3.
Yultirack:
4 racks, 74" distance, realistic spring constants.
- 4. 'ame as 3 except:
3 racks loaded, one empty.
5.
Same as 3 except: infinite distance on one side to account for 37 inch distance to pool wall.
PGKE stated they preliminarily determined that the single rack analysis impact for the 2D analysis are highest except for the multirack rack-to-wall interaction impact forces which are slightly higher.
8704240142 870410 PDR ADOCN 05000275 PDR EI,c(F34 <C
y) T
H.
Fishman and G. DeGrassi requested further clarification on the analyses.
In particular, DeGrassi inquired about the applicability of the 10 x 11 single rack analysis for comparison with the multirack analysis because the 10 x 11 rack is not part of the 4 rack analysis.
In consultation with our consultants we determined to audit the analyses at Holtec in New 8ersey to more fully understand the assumptions and modellino.
The audit is scheduled for Thursday, March 26, 1987.-
ans Schierl ing, Project Manage Project Directorate P3 Division of PWR Licensing-A
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ENCLGSURE 3 PGIIE YIEWGRAPHS 1.
Fuel Rack Layout for Pool 1
2.
Analytical Model s 3.
Four Rack Results 4.
Yariable Gap Results
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IOX 9 55 Ref.
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'L 9X9 26/le" Ref.
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97l/Ie 2 l]4 35-0 IOS FlGURE 2.1a Pool Layout Unit 1
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Case Des ri ti n
ANALYTICALMODELS Degrees of Type of d
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Basis for Impact Load al" ulati n
0 Licensing Basi s 1
Simpl ified Single Rack 2
Simplified Single Rack 3(Ml) Multiple Rack (Section A-A) 4(M2) Hultiple Rack (Section A-A) 5(M3) Multiple Rack (Section B-B) 6(M4) Multiple Rack (Section A-A) 7(M5) Multiple Rack (Section A-A) 8 3D 2D 2D 16(4x4Racks) 2D 16(4x4Racks)"
2D
,16(4x4Racks) 2D 16(4x4Racks) 2D 16(4x4Racks) 2D Adjacent Racks Hove Out of Phase; Infinite Fluid Medium (ho=~);
High Spring Constants Adjacent Racks Move Out of Phase; Infinite Fluid. Medium (ho ~);
High Spring Constants Adjacent Racks Move Out of Phase; Narrow Fluid Channels (ho=7.5");
Realistic Spring Constants Fully Loaded Racks; Narrow Fluid
. Channels (ho-7.5"); Realistic Spring Constants 3 Fully Loaded Racks, One Empty Rack; Narrow Fluid Channels (ho=7.5");
Realistic Spring Constants Fully Loaded Racks; One Hide Fluid Channel (h~37") With No Flow On Other Side; Realistic Spring Constants 3 Fully Loaded
- Racks, One Empty Rack; Variable Gaps Between Racks
[0.25" top; 1.1875", 1.375", 1.25" bottom);
Narrow Fluid Channels (ho=7.5");
Realistic Spring Constants Fully Loaded Racks;.Variable Gaps (0.25" top; 0" bottom);
Narrow Fluid Channels (ho 7.5"); Realistic
,Spring Constants 1897M/2
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