ML20128B531
| ML20128B531 | |
| Person / Time | |
|---|---|
| Site: | Seabrook  |
| Issue date: | 07/01/1985 |
| From: | Devincentis J PUBLIC SERVICE CO. OF NEW HAMPSHIRE |
| To: | Knighton G Office of Nuclear Reactor Regulation |
| References | |
| SBN-834, NUDOCS 8507030274 | |
| Download: ML20128B531 (14) | |
Text
{{#Wiki_filter:' SEABROOK STATION ' e) ( m Engineering Office ) runse savice of New Homphe New Hampshire Yankee Divlelon July 1, 19G5 SBN-834 T. F. B7.1.2 United States Nuclear Regulatory Commission Washington, D. C. 20555 Attention: Mr. George W. Knighton, Chief Licensing Branch No. 3 Division of Licensing Re f e re ur is t (a) Construction Permits CPPR-135 and CPPR-136, Docket Nos. 50-443 and 50-444 (b) PSNil Letter (SBN-705), dated August 21, 1984, " Safety Evaluation Report (SER) Outstanding Issue No. 5, ' Load Combinations, Design Transients, and Stress Limits'", J. DeVincentis to G. W. Knighton (c ) PSNil Letter (SBN-756), dated February 1,1985, " Reactor Coolant Loop Pipe Break Elimination Benefits Summary", J. DeVincentis to G. W. Knighton (d) PSNil Letter (SBN-757), dated February 1,1985, " Request for Meeting; Safety Evaluation Report Issue No. 5, ' Load Combinations, Design Transients, and Stress Limits'", J. DeVincentis to C. W. Knighton
Subject:
Safety Evaluation Report (SER) Issue No. 5, " Load Combinations, Design Transients, and Stress Limits" - Additional Clarifications Dear Sirs Confirming our telephone conversation of April 25, 1985 with your staff, the meeting requested in Reference (d) is no longer necessary; however, additional clarification of the piping analysis results provided in Reference (b) is required to support NRC review. In response to this request and as discussed with your staff, we offer the following. Six points exceed the ASME III Level C stress limits (Winter 1981 Addenda) which the staf f recommends for insuring functional capability of piping. One point exceeds the Westinghouse stress criteria provided in Reference (b). The specific points in question are identified, with associated information, in Tables 1(a) and 1(b), respectively. The locations of these points (hereinaf ter referred to as the "high stress points") as well as the location of local restraints con be determined f rom the enclosed figures. 0507030274 050701 PDR ADOCK 05000443 E PDR j P.O Box 300
- Seobrook,NH03874 Tolophone(603)474 9521 (l
United States Nuclear Regulatory Commission Attention: Mr. George W. Knighton Page 2 These high stress points do not pose a problem with regards to the formation of a plastic hinge in piping. For all points in question, the developed stress is within 10% of the allowable, whereas the stress necessary to form a plastic hinge is significantly greater. Also, for four (4) of the six (6) points, which exceed the ASME III Level C stress limits, the points are separated spatially (i.e., located in dif ferent loops). The enclosed tables also indicate that the high stress point, in all but one case, is at a reducer (i.e., concentric reducer). The cone angle for the reducers in the accumulator lines was measured to be 30 degrees and the stress intensification factor (B ) used was 0.5. The cono angle for the RHR line 1 reducer was assumed to be 60 degrees (i.e., the maximum angle) and the stress intensification factor used was 1.0. During some follow-on discussions with your staf f, regarding our clarifications, some mention was made about using the actual yields (i.e., CMTR test results) as another basis for determining piping functionality, especially for the high stress points. We do not believe that using actual yield is, technically, directly applicable in this situation. The basis for this position is that CMTR tensile strength tests are performed at ambient conditions and, therefore, cannot be directly correlated to ASME III Code allowable yield stress at elevated temperatures, although it is reasonable to expect the actual yield at temperature would be greater than the minimum yield at temperature provided by ASME III. It should be noted that CMTR test results for yield strength are typically a minimum of 10% greater than ASME III Codo allowable stress values for yield at 700F. For instance, the yield strength reported on a CMTR for a reducer at one high stress point (i.e., Figure 3, Nodes 2312-2316) is 45,200 pai, whereas the published minimum yield at 700F is 30,000 psi. As you are aware this issue is dependent on the CDC-4 cxemption which we expect to receive in the near future. Accordingly, we request written notification, by July 31, 1985, that this issue has been adequately addressed and should be considered resolved. The written notification is being requested so as not to affect activities relative to this issue. Very truly yours, / N John DeVincentis, Director Engineering and Licensing cc: Atomic Safety and Licensing Board Service List Director, Office of Inspection and Enforcement U.S. Nuclear Regulatory Commission Washington, DC 20555
William S. Jordan, III Donald E. Chick Diane Curran Town Manager liarmon, Weiss & Jordan Town of Exeter 20001 S. Street, N.W. 10 Front Street Suite 430 Exeter, Nil 03833 Washington, D.C. 20009 Brentwood Board of Selectmen i Robert G. Perlis RED Dalton Road Office of the Executive Legal Director Brentwood, Nil 03833 U.S. Nuclear Regulatory Commission Washington, DC 20555 Richard E. Sullivan, Mayor City llall Robert A. Backus, Esquire Newburyport, MA 01950 116 Lowell Street P.O. Box 516 Calvin A. Canney Manc hester Nil 03105 City Manager City llall Philip Ahrens, Esquire 126 Daniel Street Assistant Attorney General Portsmouth, NH 03801 Augusta, HE 04333 Dana Bisbee, Esquire Mr. John B. Tanzer Assistant Attorney General Designated Representative of Office of the Attorney General the Town of flampton 208 State liouse Annex 5 Horningside Drive Concord, Nil 03301 llampton, Nil 03842 Anne Verge, Chairperson Roberta C. Pevear Board of Selectmen Designated Representative of Town llall the Town of flampton Falls South flampton, Nil 03827 Drinkwater Road llampton Falls, Nil 03844 Patrick J. McKeon Selectmen's Office Mrs. Sandra Gavutis 10 Central Road Designated Representative of Rye, Nil 03870 the Town of Kensington RFD 1 Carole F. Kagan, Esquire East Kingston, NH 03827 Atomic Safety and Licensing Board Panel U.S. Nuclear Regulatory Commission Jo Ann Shotwell, Esquire Washington, DC 20555 Assistant Attorney General Environmental Protection Bureau Hr. Angi Machiros Department of the Attorney General Chairman of the Board of Selectmen One Ashburton Place, 19th Floor Town of Newbury Boston, MA 02108 Newbury, MA 01950 Senator Gordon J. Ilumphrey Town Hanager's Office U.S. Senate Town llall - Friend Street Washington, DC 20510 Amesbury, MA 01913, (ATTH: Tom Burack) Senator Cordon J. Ilumphrey Diana P. Randall 1 Pillsbury Street 70 Collina Street Concord, Nil 03301 Seabrook, Nil 03874 (ATTN lierb Boynton)
i. TABLE 1(a) Class 1 piping components for which functional capability is not demonstrated i applying the Level C stress evaluation method identified in Subsection NB-3600 l of the 1980 ASME III B and PV Code up to and including the Winter 1981 addenda. Fig. No./ Component Developed Pe rcent System Node No.(s) Type Stress Above Allowable RHR - Loop 4 Fig. No. 1/ Reducer 36400 8.2 1 3020-3025 ACC - Loop 1 Fig. No. 2/ Reducer 36200 3.9 40005-4007 l ACC - Loop 2 Fig. No. 3/ Reducer 37900 8.8 2312-2316 Fig. No. 3/ Pipe Run 36000 3.3 l 2316 i ACC - Loop 3 Fig. No. 4/ Reducer 36200 4.0 4040-4050 ACC - Loop 4 Fig. No. 5/ Reducer 35500 2.0 4030-4040 Table 1(b) Class 1 piping components for which functional capability is not demonstrated l applying Westinghouse's stress analysis method included in Attachment A in PSNil Letter (SBN-705), dated August 21, 1984. l Fig. No./ Component Developed Percent System Node No. Type Stress Above Allowable ACC - Loop 2 Fig. No. 3/ Reduce r 35785 2.7 l 2312-2316 l l
9 i i. 8" 3 11 i
- ffj ig g
j! ----- s li111111111 j' 8' i ~l i b g gh 'I g -l!!!!$!$$ l I ,= im g'I. .5 d i. ! e 31 4 .I ~w jg g i 1 A g h [i l};' 3_
j . + l Y 58-1-2501-1T* J SEE SH.1 ~ Z Xg/ 3000 160-17-2501 3020 m 12 x6" l M-3060 - n ___. N 6~-R H-V53 m 166 4-2501 4" 311 312o N esODE NO. SUPPORT NO. DIRECTION N/
- * *~
aoso teeSG10 Y 5o53 3145 aoso teenas24 X. 5000 2 4i-vios 3100 1eoSG12 X *Y teo+2501-a-311s 1easGo y / saas - siao teenass Z 5e25 come siao teoSG7 Y,1ateral 183-1-2501-3/4-3171 KEY: SG - R8G00 RESTRAsetT Ras - SeeUESER 100 3185 i 3205 8~-RH-V50 Analysis RHR Suction Line Loop 4 (Sheet 2 of 2) FIGo#E A.I i =-hw. am-mm ew ~
Or l 5 ?? g 22 i $ N- >) w) . A._. _ _. = I l li11111111 O b' kkkkkkkk!h I l 5, li nn Eg l / h n ,g i.k = El I t I } ll i J g. 9 illi jN 4 giIII IN!NI lI ~ u. t 1 I i NR l\\1 - i s 1 W 1 g ,s ! 1l ) I t I
a r N ^ O t IT Z, I, Z, 1, CE YYYXYY R I D 5 6 O 3 N 0 0 4 1 T 3 S 0 34 6S 0 R M GGM GG 4 O R5GRSS P 55E565 P 555555 U 1 11 111 S m 52 5 04 1 04 o O 5 N 050500 10 457827 2 4 E 00001 1 1 D 444444 0 O 4 N 70 5 0 0 0 7 4 0 04 4 1 57 0 1 0 0 0 4 ,2 4 1 E ,5 0 E,IN p g 0 o c 0 0 L o A 3 4 3 L 00 e 0 n 2 ) i 4 1 L 5 o 8 T r N 5_ 04 E o t E a 9a t 5 H m) 1 E S V-0V L9 E m2 0 4 H H E R S Af t, R_ 5 ( - oi 02 T s2F 4 5 N est 8 0 ye I 1 2 A ae l 3 R nh 4 14 S l T A( 0 ,4 S 0 RE 0 ER a 8 ~ B D 0 0 U G I 7 55 3 Nl 1 01 1 SR 4 01 4 55 5 0 2 3 Y 0 8 E M G 5 5 K RS Z s 5t 0 V-3i 5 0 Ya 0 0 t 5 4 0 5 ~ 1 0 5 s 2 4 5 14 E X N o U 5 0' 4 5 1 1 4 4
i e = 11 i i i i l 2-0'-233 l{t ,...A. e N R j 11lll1llll se i s R
- k l
g IEEEIE!!! .l/ $~ l s, o., x ,a g ~
- l 1
I 9 i 4 y
- l 5
n o g h 48 g n g k 'l N / k NN$ f G k
l' l ~' h 5 1 M*N l J X ~ = 5 E kg g gh s l e!!!! i !i 11 l = i' i i g i llHil i iH N l 'l ~Il 5 3h i l 4 ,I l, A n 7l, 'l ,1 s" S II d
- n E
Il g 'i ,1 Rkk k I R /as 'i ,k ! \\, L
s i 3 5 5 L E d *- 2 l\\ s I. ll..i1llllllll j Y i g el i 8 g 0 .e 1 i i d a I 1 I 1* Mii 4 W ai iE !(l!! I i i fl =N~g i ii " leg i I I 5 n E N n ) l! llll i d,.' g .. l l gg NkNN 2 i J 9
O ) E * >- s ii i 2 git %%ill I i i i I Il s g a e g gia i\\ 1 g I l + i 4 a h-{ il! E I %'i i s i i 4 ui i
e 1 1 I ilk l =i. 'i ii i i, um l .c , 's i .' s i i. I g c g .A I-A i Ii 3 l a..?s
- a. $ ! k-
g g 1 I a e, l 111111111111 '!; i i i,,E
- iif, i
- 11. k I
- 3
.g el Ili ~ i g 1t!.5511:111: 4 /" l i 5 e l 4 e
e t f l 8 E sum. y ---s--- j l l = g i/, l l l ill!!! i t I wIll i I. g !!jlill ,1 s .I N -g s y g 'l I!g I 1 I 8 R i s a4 E 8 im d l b* R l v l[ l" i, I . o%, I. g. u n Il I:k b di I g I -}}