ML20010G798
| ML20010G798 | |
| Person / Time | |
|---|---|
| Site: | Wolf Creek, Callaway  |
| Issue date: | 09/16/1981 |
| From: | Petrick N STANDARDIZED NUCLEAR UNIT POWER PLANT SYSTEM |
| To: | Harold Denton Office of Nuclear Reactor Regulation |
| References | |
| SLNRC-81-103, NUDOCS 8109220533 | |
| Download: ML20010G798 (4) | |
Text
{{#Wiki_filter:1 SNUPPS Standardized Nuclear Urnt c Power Plant System 5 Choke Cherry Road Nicholas A. Petrick Execut ve Director i v ryted 20e50 September 16, 1981 SLNRC 81-103 FILE: 0278 SUBJ: NRC Request for Information - Materials Engineering
- F s
Mr. Harold R. Denton, Director
- $Q Office of Nuclear Reactor Regulation Ic f 5
Mr U.S. Nuclear Regulatory Commission lI' 30 Washington, D. C. 20555 h' 4 =v:6 7 fy 4 Docket Nos. STN 50-482, STN 50-483, and STN 50-486 y
Reference:
SLNRC 81-71, dated August 17, 1981, same subject k
Dear Mr. Denton:
The attached information was requested by Mr. J. Halapatz of the NRC's Materials Engineering Branch. Very trul yours, ,C%C Q Nicholas A. Petrick RLS/jdk Attachment cc: J. K. Bryan UE G. L. Koester KGE D. T. McPhec KCPL D. F. Schnell UE W. A. Hansen NRC/ CAL T. E. Vandel NRC/WC I $O D s I I 8109220533 810916 PDR ADOCK 05000482 A PDR L
SNUPDS cDC-51 Main Steam Isolation Valves Main Steam and Main Feed Penctration Caps Flued Head Penetration Main Feed Isolation Valves 1. NRC proposed Pen. Thickness LSNT Pen. Thickness LSNT Valves; MS: AB-HV11 66*F & varioca MF: AE-FV42 60*F LSNT s P-1 8.0" 113*F parts 9 P-83 & 0.937" (see Ite: various l P-86
- 5 below' P-5 5.5" 98'F thicknesses P-43 0.937" (see Ite a f5 below >
2. Ncrmal Opera-(See item #5 below) A. Flaed heads for both main feed and A. (See item #5A below) main steam penetration are at normal tion operating system flued temperature which I i are well above the proposed LSMT's. 3. Maintenance (See Item $5 below) Main Steam Main Feed A. (See Item f5A below) and Testing A. Hot Standby - For A. Hot Standby - the these conditions the small motor driven main flued head will be feed pump will be used i at system fluid ten-for hot st'andby'c'nditions. o perature which are) The hot feedwater will LSMr's. keep the flued head well l B. Cold Shutdown - above the LSNr. l (see Item #5 below)
- 5. Cold Shutdown-see #5 4.
Postulated (See Item #5 below) A. For DBAs normal A. For DBAs see 4A for A. (See Item #5A below) Accidents operating tempera-main steam. l ture and pressures B. For other conditions are assumed as ini-see 48 for main steam tial conditions. See 2 A above. B. For postulated accident at other initial conditions see 3 above. 1 See Next-Page for Item #5 l j
f --~ a GDC-51 Main Steam and Main Feed Main Steam Isolation Valves Penetration Capa Flued Head Penetrations Main Feed Isolation Valves 5. Remarks A. The design of the pene-A. For the CSD condition,
- 4. (See Item #5A for A. MSIV's and MFIV's are tration caps listed above pipe break loads would main steam) not considered part of the has been evaluated and the not be induced on the containment boundary (see currcat design shows that maia steam flued head.
B. (See Item #5B for response to GDC-57, in FSAR they are properly sized to Therefore, an analysis main Steam) Section 3.1) and therefore, fulfill their function; was performed to deter-need not be considered i.e., the design thick-mine the minimum required under CDC-51 review. ness is more than suffi-wall thickness with than B. However, a similar cient to maintain con-load missing. This argument can be offered for tainment function. thickness was found to the MSIV's and MFIV's as B. However, it has been be f 2.5". (Gee, gitacheJ) that for the flued heads. calculated that to ful-B. Pipebreak loads are (See 5A and 5B under fill the same function, the' largest loads on the main feed and main steam the minimum required . flued heads and are the flued heads) wall thickness is:55/8". controlling factore (750%) Under code requirements in establishing.the flued material of this thick-head dimension, ness need not be impact C. The limiting tempera-tested. Therefore, caps ture condition on the with a minimum required flued head occurs during ' wall thickhess 'of 5/8" the hydrostatic test of will maintain containment the steam generators. function for all tempera-For this test, tempera- ~ tures are maintained tures. above 70*F. 0 3
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g;j },M l j.; v ( i; g ' ( p j SNUPPS T t ,' [ >f f; N "[. Main;8teaq and5Feedshter iPenetratio[j @y 9 ~ i 1' i t,' .; M l i ' /,. Jf.y;Q, l,h p, St 9 W[@ h j L 1),'/1 W i , ;l Stress ' Analhs,is'. ' lor, Flued Head: Cor tI i H @lh u 1 [ l' .Peference d ^M.O Iihor GNUPPS, Mafn Steam PeriatrSt(bnNI r, E @s, - g$ l i[ -f 5 l ' l', ' rW 3 ','!Februaryf 8,' 1978 Kg, Sargerit 'Ir(d,ds'tV (,g';[ -S-104,70ll Ref.lB' t j W M F g lj l j.} ! y]l, f,%Ml 3 s. nininig eicnght 2y istress' Analysis 'for rlue'daliead corg!1'pna MfpI 6.f b t' 'for SNUPPS, Main 'Foedwater Pehetgat j t 8 - R-S-104702,1 Rev. A, Sargent! Ig$ti s't Qif lj Division,'Febrbiry 8, 1978 N Gentlemen: i 'hj$NU{d,-(4 As per your request, we have evaluated the acceptability ll,0 PS mainstean, and feedwater penetrations assuming thatSthe'llon udinal G 'nli'gura. through head thickness were to be changed from the exist'id ,., 'f; i I tion to 2.5". 1,[p. 1,' (gj ltan@ i 9 m.. 4 gest Stress analyses for thin geometrica). condition,iiri istress intensities are within a load conditioned INJ N f' :k itl t and faulted (excluding pipe break) i j, 1M ? d The longitudinal through head design thickness,'q.l!K.h'N, excludi'ng:. peybre'ak for the mainsteam and feedwater SNUPPS Flued-}leadfpenetration'g. s,*.
- loads, is hereby re-established as 2.5".
G M i i d fi J$ l S[ If questions arise, please contact the undersigriedh, l L,f.! { N h. '! Nj tz. i L f~sEcitr ,k s. li 1 :, h.4 i l Very truly yours, 3h h" *hi? $ . f; 'l i 4 s
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