ML18046B177
| ML18046B177 | |
| Person / Time | |
|---|---|
| Site: | Palisades  |
| Issue date: | 12/18/1981 |
| From: | LAWRENCE LIVERMORE NATIONAL LABORATORY |
| To: | |
| Shared Package | |
| ML18046B116 | List: |
| References | |
| CON-FIN-A-0436, CON-FIN-A-436 EGG-EA-5317, NUDOCS 8112290320 | |
| Download: ML18046B177 (21) | |
Text
{{#Wiki_filter:* SUPPLEMENT TO REPORT EGG-EA-5317 Report EGG-EA-5317 (Reference l) describes the analyses performed on portions of five different piping systems from the Palisades Unit 1 Nuclear Power Plant. This work was in support of the Nuclear Regulatory Commission's Systematic Evaluation Program (SEP). The results described in the Reference l report showed that allowable stresses for the "current criteria" Safe Shutdown Earthquake (SSE) 16ad case were exceeded in the Regenerative Heat Exchanger (RHE) letdown piping model, the auxiliary feedwater piping model number two, and the steam line to the P-8B turbine piping model. Consumer's Power Company (CPCo), the plant owner, and Bechtel Power Corpora-tion subsequently reviewed the data that had been supplied to perform the ana~yses of these pipe lines. A joint meeting of representatives from CPCo, Bechtel, EG&G Idaho, and the NRC ended with the conclusion that certain as built information had not been provided for inclu~ion in the Reference l analyses. The following pages describe the modifications to the three pre-viously mentioned piping models and the resulting conclusions wheh the new information is considered. The* new information for the RHE letdown line indicated that several supports existed in the area of valves CV 2002, CV 2003, CV 2004, and CV 2005. These supports are situated such that axial restraint of the main 30 foot span of RHE piping shown in Reference l will be provided. Drawings of additional piping and supports connecting to the above mentioned valves were also examined. Assuming that this information is indeed accurate, experience and engineerfng judgement were used to conclude that the RHE piping considered in Reference l should not be overstressed during an SSE event. No additional finite.element analyses were performed for this piping. Additional information pertaining to the auxiliary feedwater model number two consi5t primarily of anchorage details. The model contains a six inch nominal size branch line which penetrates a building wall and connects to underground (11112290320 8112185.,. PDR ADOCK 0500025 . 1 p PDR
3
- piping. Since no details were known, the model shown in Reference l was termin-,.
ated at the wall with a three directional restraint. The new information ~hows that an anchor may be assumed at this wall penetration. Also, the updated drawings showed that stiffer flange elements could be used at the pump connections. These changes were incorporated into the finite element model which is shown in Figure 1. As expected, the increased stiffness from the added anchorage details raised the natural frequencies of the model. The first 10 natural frequencies and periods of vibration for the revised model are shown in Table 1. Table 2 shows the ASME Code, Class 2, equation 10 (occasional loads) stress results for the anchor points and the three highest stressed points on the model. Tables 3 and 4 summarize the revised support and anchor loads, respec-tively. In general, the revised stresses and support and anchor loads were lower than those reported in Reference 1. The NUPIPE-II computer program was used to calculate all results described herein. Both support modifications and anchorage details were included in the additional
- information for the steam line to the P-88 turbine. The revised finite element model is shown in several parts in Figure 2. Important model changes are listed below:
- 1. A three-directional restraint was replaced by an anchor point at an underground wall penetration (node 315).
- 2. Support H924A was modified to provide up and down vertical support (Y global direction, node 10).
- 3. Support H9 (node 510) was modified to provide both vertical and lateral dynamic support.
- 4. Support Hl3 was relocated approximately six feet upstream (from node 655 to node 665) .
- 5. Support H23A was added (node 970) to limit east-west movement in the area of valves MS 05228 and MS 0522A.
2
RV 0783
... *
- LH~l:!HJ *
- 120 tl"DE L"CA110tl Cl MASSPIJINT l.0CAT ll,11
~ SPRING llAtlGER
*o ic=J- SNUBBER
~~ RI Gill SUPPIJRT 11 eo 122
.,. ~
11 ANC110R ELAS1" J01NT 10 126 ~ FLEXIBLE ANCll0R Wall Penetration Ee=i VAL VF Anchor (To 130 Underground Piping) 110 140 y 146 111 160 w 11* P-8A Anchor 46 40 30 R0TATl011 AB0UT Y*AXI!; X*Z PLAllF TILT P-8B Anchor Figure l. Palisades Auxiliary Feedwater Piping Model #2
\~
- TABLE 1.
Mode
SUMMARY
OF FIRST TEN NATURAL FREQUENCIES AND PERIODS OF VIBRATION--AUXILIARY FEEDWATER MODEL NO. 2 f T {Second) J.&. 6.99 0 .143 2 13.8 0.073 3 19. 1 0.052 4 21.2 0.047 5 22.9 0.044 6 25.8 0.039 7 28.3 0. 035 . 8 33.3 0.030 9 34.9 0 .028 10 41 .2 0.024
- 4
- TABLE 2.
Node SUMMA.RY OF ASME CODE, CLASS 2 EQUArION 10 STRESS VALUES, "CURRENT CRITERIA" ANALYSIS (SSE LOAD CASE)--AUXILIARY FEEDWA TER MODEL NO. 2 SSE Stress (ksi) SSE + RV Allowable Comment 5 10.6 12 .6 36 .o Pump Anchor P-88 160 15.5 18.7 36.0 .Pump Anchor P-8A 205 12.8 13. 1 36.0 Wal 1 Penetration 60 13.5 36.0 El bow 70 14 .1 36.0 - H227 A Support
.Po int 95 14 .1 33.3 36.0 El bow 155 15.0 17. 1 36.0 Tee NOTES: .
- 1. 2% damping used.
- 2. Allowable stress (2.4 SH) based on SH = 15.0 ksi for ASTM A 106 Gr B carbon steel at 450°F.
- 3. Equation .10 stresses include the effects of pressure, sustained loads (deadweighti and occasional loads (SSE).
- 4. As used in the stress column, RV implies that relief valve discharge loads-were added to the SSE loading.
5
7 TABLE 3 *. SUPPORT LOAD SUMtt\A.RY--AUXILIARY FEEDWATER MODEL NO. 2-- SEISMIC LOADS ONLY . LOAD ( K) Current 2% Current 2%
- Node Direction SSE SSE + RV 100 x 0.466 4.47 100 y 0.010 0.018 270 x 0.049 0.125 270 INCL 0 .107 0.119.
NOTES:
- 1. Directions are global axis orientations. 11 Incl 11 implies that the restraint direction is inclined with respect_to the global axes.
11 11
- 2.
- SSE + RV means that this 1 oad case was a combination of SSE 1 oads plus relief valve discharge loads.
6
TABLE 4. . ANCHOR LOAD
SUMMARY
--AUXILIARY FEEbWATER MODEL NO. 2-- SEISMIC LOADS ONLY Current Current Node Direction SSE SSE + RV 5 x 0.229 0.286 y 1.01 1.98 z 1.38 1.47 xx 37 .6 47 .1 . yy 5.57 10.4 zz 4.16 10.9 160 x 0.269 0.600 y 1.96 3.25 z 1.65 1.79 xx 68.2 .84 .1 yy 8.48 16.5 zz 4.07 11 .8 205 x 0.663 0.984 y 0.304 0.668 z 2.02 2.07 xx 2 .86 31.0 yy 68.3 71.6 zz 2.80 4.86 NOTE:
- 1. Directions 1 i sted are in the global coordinate system. 11 X11 implies a force in the global X direction. 11 XX 11 implies a moment about the global X axis.
- 2. "SSE + RV" means that this 1 oad case was a combination of SSE 1oads plus relief valve discharge loads.
7
.I
-------- Match Point A AUX. FEED- STEAM T0 P-80 NUPIPE MATHEMATICAL M0DEL 110 "*LEGEND**
I N"DE L"CATl"N C!> HASSP"INT L"CATl"N
+:./IN-- - SPRING HANGER 4=J- SNUBBER
- - - - - 4 Inch Piping ~ RIGID SUPP0RT HO ~ ANCH0R JI! ELASTGI J" INT FLEXIBLE ANCH0R
~ -
El!E3 VALVE y co x
*o
_10 10 P-8B
* /\nchor Point Figure 2. Partial Plot of *Palisades Steam Line ~o P-8B Turbine Piping Model
Wall Penetration-- Anchor ... AUX. FEED sn AM NUPIPE MATHEMATICAL MllUl: rn I' HH 110
**L.FGEND**
so* I N0llE L0CAT10N l'l MASSP01NT t 0l' A 1 1 l~ll
~--,/\/\/'-* SPRING flANGl.fi, ooo t-C~J- SNUBIJER 8'
~-*
RI Gill SUPPIJRT U6 -§ ANCIH,JI? w ELAST0 J01NT
- FLU< IBLE: AIKIHlR uo EEE=.! VAL.VI.
All Piping Four Inch Nominal Size 200 CV 0521
~-*b* I ' x.
"~~ **o 21.J
. . ~~ 2'4b
'~-'~ 2*0
'~
Match Point B
, _Match Point A
;* I ~. .
Figure 2. Partial Plot of Palisades Steam Line to P-8B Turbine Piping Model (Cont'd)
Match Point C
/ 1illi'.. 1-f. Ul :* i I* ,;M : f' :ii<
NUI-' I f'l MA I HI: MA I I l .. AI t-lll:+:
*
- I I* t; I !. : -
UIJDI IJCA!ILlf< MAS~PJ I tl: _: ~k;.' ;.*11;
._j- ,/\,'\:" SPR ! IJG llAljGI f-;
30.5' I r*-::*) SNUHBrR
'1 -1 R 1-G l D SUPPl.'JR T
__ E ANClll.JR E
)If ELASTl.J JIJINT
- FLEX I BLF ANOllJR liAL VE All Piping Four Inch Nominal Size y
0
*~o 00 Floor Anchor - - - Li 'iJ .,.
HO z x Match Figure 2. _ Partial Plot of Palisades Steam Line to P-3B Turbine Piping Model (Cont'd)
AUX. FEED- STEAM T~ P 88 NUPIPE MATHEMATICAL M~Dfl
**LEGENll**
N00E L0CATl0N Cl HASSP01NT UlCATl0N
..,....v\/V'-- SPRING llANGEll 1--c:::::J--- SNUBllER Point~
~--1 RIGID SUPP0RT 10,
-~ AtlCfl0R Match
- El.ASH! J01NT
~ FLEX I OLE ANCll0R Ea3 VALVl uo HO y All Piping Four Inch Nominal Size
.. a
- \*:
Match Point C Figure 2. Partial Plot of Palisades Steam Line to P-8B Turbine Piping Model (Cont'd)
All\. f 1-"I L .:;fi*:d-~ '""'-c Ill Jf' I t *1 M,; ~ Ill: M;, ; : ,. . l*L *' :
* * ! i *;I ! j:
I tlJl>l ; ,, A 1 I ,1:; ('j Sl'R I tlG llAtoi.a h I { ..:I ,;fllJlllffll 4)- ~ RIGID SlLf'J'llJ\T
*t:~ AllCIWll HAST:.l Jl.llNl
)Ii
*:tC
-~ FL EX I Bl l AflCllllf\
r~*l!E'1 VAL Vl a 16 y alO N
*r~ri.
All Piping Four z 1"0 Inch Nominal Size
*141L no 116 110 'L"'L D
Figure 2. Partial Plot of Palisades Steam Line to P-88 Turbine Piping Model (Cont'd)
AUX *. H* l: 11 :-;*1 i.-.AM :: .;i< IJUf*' I PE M:-111£: M,\1 I<,;; ~~-': .1 . MS 522A------
**I [*Gl*llll*
- NUDE l0CATl1ltl MASSPUIN*r Li.JCAI :,ir; SPRING llANGlf\
1-{=J SUUBBER MS 5228--- ---- Match Point F '"'1-l RIG I[) SUf'l'Uli:l 1016
*-t= At1Cll0R ELASTlll J~llNl
... -* FL[)( I RU: AtlCltlllf\
y All Piping Four w Inch Nominal Size z x
- - - Match Point E .Figure 2. Partial Plot of Palisades Steam Line to P-8B Turbine Piping Model (Cont'd)
Atmospheric Vent u u - - - Anchor Point I 110 NUPIPE MATlllMAl ll'Al ~l,~!.i:
*
- l (-t;(:t l!l **
111* tlL'lOI. l IJCAJ I lit; HASSPL'llNT l.L'l*.:.*:.i:, SPRING JIANG! fl
*-c:~1- SNUIHlEll 1110
.._1 -I RIGID SLIPPL'llil 1100 c ANC110R ELASlL'l J*l ltll
- FL EX l llU ANClllJ!<
Ei!l"'l VALVJ' y 10611. Eight Inch Nominal Size Piping
=l 0
- z x I Gl.'J t0 . I :.t~
10¥,,." Anchor Point On 36
.,,,., 8"x4" Reducer. Inch Steam Line
~ ll JI Point~
1171) Match I I U!.. I du Figure 2. Partial Plot of Palisades Steam Line to P-8B Turbine Piping Model (Cont'd)
The changes listed above were incorporated in the finite element model shown in the several continued se:ticns in Figure 2. The first 10 natural frequencies and periods of vibration for the revised model are shown in Table 5. As expected, the increased stiffness due to the additional anchorage details and supports had the effect of slightly raising the natural frequencies. Table 6 shows the ASME Code, Class 2, equation 10 stress results for the anchor points and the three highest stressed points on the model. Tables 7 and 8 summarize the revised support and anchor loads, respectively. In general, the revised stresses and support and anchor loads were lower than those reported in Reference 1. Microfiche copies of the NUPIPE-II computer runs utilized for these additional analyses are attached. The results discussed above demonstrate that the RHE letdown, auxiliary
- feedwater (model number two), and steam to P-8B turbine pipe lines will not be overstressed during the postulated SSE event used for these. analyses.
These results should be used to supplement those found in Reference l. The results and conclusions stated in Reference 1 remain unchanged unless specif-ically mentioned above. REFERENCE
- 1. M. E. Nitzel, "Summary of the Palisades Unit l Piping Calculations Performed for the Systematic Evaluation Program", EG&G Idaho, Inc.
Report EGG-EA-5317, January 1981. 15
17
- TABLE 5.
Mode SUMtilARY OF FIRST TEN NATURAL FREQUENCIES AND PERIODS OF VIBRATION--SfEAM LINE TO P-8B TURBINE i1:!!L T (Second) 1.80 0.556 2 2.85 0 .351 3 3.69 0.271 4 3.75 0.267 5 4. 16 0.240 6 4.72 0. 212 7 4.84 0.217 8 5.20 0.192 9 5.53 0.181 10 6.56 0 .152 16
- TABLE 6.-
SUMMARY
OF ASME CODE, CLASS 2, EQUATION 10, STRESS VALUES, 11 CURRENT CRITERIA ANALYSIS (SSE LOAD CASE)--STE.AM LINE 11 TO P-8B TURBINE 11 STRESS (ks i ) Node Audit Calculations Allowable Corrment 5 9.77 36.0 P-8B anchor 315 25.5 36.0 Wall penetration anchor 470 14.0 36.0 Floor anchor 1120 18.5 36.0 Atmospheric vent anchor 1170 9.89 36.0 Anchor at 36~nch line l 015 35. l 36.0 Tee intersection 1020 32.5 36.0 Weld (end of tee leg) l 095 33.2 36.0 Valve-operator junction
- NOTES:
- 1. 2% damping used.
- 2. Allowable stress (2.4 SH) based on SH Gr B carbon steel at 550°F.
= 15.0 ksi for ASTM A 106
- 3. Equation 10 stresses include the effects of pressure, sustained loads (deadweight) and occasional loads (SSE).
17
If TABLE 7. SUP PO RT LOAD SUMM~RY--STE.AM LINE TO. P-8B TURBINE-- SEISMIC LOADS ONLY SUP PO RT LOAD ( K) current 2% ij)de Direction SSE 10 y 4.62 125 x 0.916 y 0.028 220 y 2.24 z 0.557 415 z 0.354 510 y 0.362 z 0 .421 555 x 0.438 575 z 0 .563 600 y 0.306 630 y 0.200 . 655 x 0.506 y 0 .441 685 y 0.675 710 x 0.493 745 z. 1.41 770 z 0.490 800 x 0.483 y 0.627 18
TABLE 7. (continued) Current 2% Node Direction SSE 825 y 0.325 880 x 0 .521 y 0.324 895 z 0 .507 970 z 0.803 1040 INCL. 2.08 INCL. 1.95 1070 x 5.94 z 1.24
- 1. Directions are global axis orientations. 11 INCL 11 implies that the restraint direction is inclined with respect to the global axes.
19
TABLE 8. Ml: f-0 R LOAD
SUMMARY
--STE.AM LINE TO P-8B TURBIN-E-- _, SEISMIC LOADS ONLY ANCHOR LOAD (Korin.-K) Current 2% Node Di rec ti on SSE 5 x 0.640 y 4. 14 z 0.769 xx 4.66 yy 7 .42 zz 5.36 315 x 0.902 y 0.242
- z xx yy 0.606 17.3 42.0 zz 4 .Ql 470 x 0.542 y 0.372 z 0.199 xx 15 .4 yy 4.73 zz 29 .8 1120 x 1.81 y 4.29 z 1.95 20
TABLE 8. (continued) Current 2% l'bde Di rec ti on SSE xx 90.9 yy 199. zz 39.5 1170 x 1.55 y 0.236 z 0 .171 xx 8.44
- yy 3 .50
. zz 46.2
- l. Directions 1 i sted are in the global coori nate system. 11 X11 implies a force in the global X direction. 11 XX 11 implies a moment about the global X axis
- 21}}