ML20133N431
| ML20133N431 | |
| Person / Time | |
|---|---|
| Site: | Catawba  |
| Issue date: | 07/24/1985 |
| From: | Tucker H DUKE POWER CO. |
| To: | Grace J NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II) |
| References | |
| SD-414-85-08, SD-414-85-8, NUDOCS 8508130486 | |
| Download: ML20133N431 (19) | |
Text
{{#Wiki_filter:. _ _ _ _ _ _ _ r Duxis Powitit GoMmNY l'.O. ISOX 3311)f) CIIAItLOTTl! N.C. 2(1242 IIAL 11. TI'GKEI4 TetersioNr: vu e..em =r (704) il7:1-4 Mill .u......'""'" July 24, 1985 Dr. J. Nelson Grace, Regional Administrator U. S. Nuclear Regulatory Commission Region 11 101 Marietta Street, NW, Suite 2900 Atlanta, Georgia 30323 Re: Catawba Nucicar Station, Unit 2 Docket No. 50-414 Significant Deficiency No. 414/85-08
Dear Dr. Grace:
Picase find attached a supplement to our status report, dated July 15, 1985, which described corrective actions on the subject deficiency. This information, requested by Region 11 staff, consists of an engineering evaluation of over-pressurization of components of the Residual IIcat Removal System, the Boron Recycle System and the Nuclear Sampling System. Very truly yours, c gk-O / Ital B. Tucker LTP/mj f Attachment cc: Director NRC Resident Inspector Office of Inspection and Enforcement Catawba Nuc1 car Station U. S. Nucicar Regulatory Commission Washington, D. C. 20555 INPO Records Center Suite 1500 Mr. Jesse L. Riley 1100 Circle 75 Parkway Carolina Environmental Study Group Atlanta, Georgia 30339 854 IIenley Place Charlotte, North Carolina 28207 Robert Guild, Esq. P. O. Box 12097 Charleston, South Carolina 29412 Palmetto Alliance 2135 Devine Street Columbia, South Carolina 29205 8508130406 050724 PDR ADOCK 05000414 S PDR t ( Z J'7 /
i i i E i i i I Catawba Nuclear Station SD 414/85-08 Supplement July 24, 1985 l I i I i
P=. fi *[ T Page 1 of 5 DUKE POWER COMPANY DESIGN ENGINEERING-SYSTEMS AND EQUIPMENT SECTION ENGINEERiflG JUSTIFICATION REPORT Date: May 22, 1985 Report No. MDS-JR-51 To: E. M. Couch Originated By: O[af,[ . E-22 g5 Station: Catawba 1-2 Checked By: // M MfM( System: NB, ND, NM Approved By: J' D)M C SW gL File: CN-1206.00-02 QA Approval By: Mg g/f/fT' /' Variation Reported By: NCIR 19,632 1 Description of Variation Piping in the NB, ND, and NM systems was pressurized to 2000 Psig during testing as described by NCIR 19,632. Engineering Evaluation (1) HD System Flow Diagrams: CN-2561-1.0, 1.1 Line 02 PS 601.2, Pipe SA 312 Tp 304 Smis./EFW The allowable hydrotest pressures and the calculated stresses are tabulated by Table 1. Evaluation for 6", 8",12" and 14" piping: _6" Piping was stressed to 83% of S based on the Minimum S required by y the material speci fication. Piping is acceptable since stresses < S. Y _8._"_ Piping was stressed < the actual material yield strength as determined by review of the mill test reports. The lowest S for pipe material was found to be 41,000 psi. The lowest yield str6ngth of any fittings y was found to be 39,800 psi. Thus the pipe was stressed to 9t% S and the fittings were stressed to 94% S. Pipe and. fittings are acceptable y since stress < S and based on the following conservative factors: (a) Evaluation is based on the material specification minimum wall thickness. Actual wall thickness of the pipi.ng is greater than the material speci fication minimum wall thickness. In addition fittings would be expected to have a wall thickness greater than the wall thickness of the pipe. So even though the fittings have a lower yield strength than the pipe, the stresses in the fittings would be expected to be lower than the stresses in the pipe because of the greater wall thickness of the fitting.
~ Pags 2 of 5 't' - .i Table 1 ND System Pipe Allowable Pressures and Theoretical Stresses for 2000 Psig Hin. % of NPS Sch. Wall Pa (Psig) Max. Hydro Theo. Hoop % of Min Spec. Actual Yield (In.) (1) Press. (Psig) (2) Stress (Psi) (3) Yield Strength (4) S t rength(s) 1/2 40 .09S 3991 6346 3/4 40 .099 3255 5175 Piping is acceptable since allowable hydrotest pressure > 2000 Psi. 1 40 .116 3044 4840 2 40 .135 1900 3021 3 40 .189 1804 2868 4 40 .207 1529 2431 6 40 .245 1218 1937 25041 83% 8 20 .219 827 1315 37384 125% 94%- 12 Std 328 839 1334 36872 123% 85% 14 40 .383 894 1421 34554 115% 71% i Notes: (1) From CNC-1232.00-00-0010 Table S using E = 0.85 at 100 F (2) Max. Hydro Press = (Pa) (1.5) (1.06) (3) Theo. Hoop Stress = (2000) (D-2 x tg) / 2 t g (41 Min, S = 30,000 Psi per material specification. (5) Actual S determined by review of Mill Test Reports. Y ,/
,, it Page 3 of 5 (b) The actual yield strengths used in this evaluation are the worst case. Most materials have actual yield strengths greater than the yield strengths used in this evaluation. 12" Piping was stressed to 85% of S based on review of mill test reports which found the lowest S = 43,y300 psi,g. The 12" pipe and fittings are acceptable since stress Y< S and based on the conservative wall thick-y ness values used in this evaluation. 14" The 14" piping consists only of 14" x 8" reducers. The reducer was-stressed to 71% of S based on review of mill test reports which found y the actual S = 48,800 psl. The 14" reducer is acceptable since stress < S and the actual wall thickness value used in this evaluation is con-se rlati ve. Evaluation of Flanges: Flanges are 600 lb, A182 F304 B16.5 Rating @ 100 F = 1140 Psig Max. Hydrotest Pressure = (1.5) (1.06) (1440) = 2290 Psig ~, The flanges are acceptable since maximum hydrotest pressure allowed, 2290 Psig > 2000 Psig test pressure. (2) NB System
- Flow Diagram:
CN-1556-1.1 PS 151.3 Pipe SA 312 TP 304 EFW. l The allowable hydrotest pressures and the calculated stresses are tabulated by Table 2. Evaluation"for Flanges : Flanges are 150 lb, A182 Ff04 (Reference Notes 1 and 2 on page 5) B16.5 (1977) rating at 100 F = 275 Psig i' Allowable Hydrotest Pressure = (1.5) (1.06) (275) = 437 Psig Flanges are not acceptable for 2000 Psig pressure. (3) NM System Flow Diagram: CN-2572-1.0 & l.5 PS 1501.8, PS.2501.4, TS 2701.4 Haximum Hydrotest PS No. Pa at 100 F, (PSIG) (1) Pressure (Psig) (2) i 1501.8 1420 2258 2501.4 3209 5102 2701.4 2900 4611 4 Notes: (1) Pa = Design pressure parameter from piping subtable (2) Max. Hydro. Press - (1.5) (1.06) (Pa) Piping is acceptable since maximum hydrotest pressure > 2000 Psig. ~ - - -.. - - - - -. .--_,--,_-.m.,.-..~ ,,_,,.,,,.-w- .m
Page 4 of 5 Table 2 14B System / Pipe Allowable Pressures and Theoretical Stresses for 2000 Psig NPS Sch. tMin. Pa (Psig) Max. Hydro Theo. Hoop % of Min. Spec. (In.) (1) Press. (Psig) (2) Stress (Psi) (3) Yield Strength (4) 1 40 .116 2865 4'555 Piping is acceptable since allowable hydrotest pressure > 2000 Psi 2 40 .135 1788 2843 3 40 .189 1698 2699 6 40 .245 1146 1822 25,041 83t (1) From CNC-1232.00-00-0010 Table H (2) Maximum Hydro Pressure = (Pa) (1.5) (1.06) (3) Theo. Hoop Stress = (2000) (D - 2 x t )/2t (4) Min. S = 30,000 Psi per material specification t
Page 5 of 5 Engineering
Conclusions:
All piping subjected to the 2000 Psi pressure was found to be acceptable except for the 150 lb. flanges. The 8",12" and 14" piping was quali fied by using the yield strength values from the material test report s. Engineering Disposition of Variation: The 150 lb. flanges require replacement. All other piping is acceptable. This disposition is addressed by Attachment No. 2 to NCIR 19632. T. F. Wyke, Chief Engineer Mechanical & Nuclear Division / [rt-S. S. Lefier, Jr., Design Engineer i SSL:mmg Attachments: Copy of NCIR 19632, Attachment Nos. I and 2 cc: D. R. Ingle w/o attachments ~' R. C. Gamberg n T. E. Goodson n T. C. Roberts n T. D. Crom n R. E. Miller n R. L. Williams n J. E. Cavender Note 1: Review by the Sttess Analysis Group found the 150 lb. flanges to be unacceptable following the 2000 psi test pressure. Reference Attach-ments No. I and No. 2 Note 2: Review of NB flanges covered under PS 151.3 found that 300 lb. flanges were furnished with relief valves 2 Nil 61, 2 Nil 51 and 2 Nil 19. The B16.5 rating fro SA 182 F304 flanges at 100 F is 720 psig corresponding to a allowable hydrotest pressure of 1145 psig. This value is less than 2000 psig test pressure however the Stress Analysis Group was able to qualify the flanges to be acceptable as stated by Attachment No. 2. Therefore the 300 lb. flanges are acceptable as installed. l i
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Vendor /Locstion. Documents Viofated
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Finw ningra m DUKE POWER COMPANY fUA' N/A . rN-25M - l _0. 25 M -1_1. MPS PO NO. Mech /Elec System 7572-1_0 9677-1 ; and Project _ CATAWBA Unit 2 A EN-1556-1_1 nn Hn NM NONCONFORMING ITEM REPORT cdCondition Class identification Method O. l B's uWi ]NCI Tape Serial No. l&2 E&B OtherArc e a iv n u;;.e r uu s iv ict~ xjNot Practical - l 9 (r.3Q Lc. cation of item Various piping, valves and equipment were overpressurized by fl.P.D. while operating the Description of Nonconformance centrifuoal charging pump "2B" during cold hydro. This problem was discovered when fl.P.D. found water spraying from flances on relief valves 2ND031 and 2fiM296. Subsequent review of testing procedures then discovered the over-pressurization had occurred. See attached page #1 for additional information. This incident occurred during the a.m. hours of 4/19/B5. No physical damage is evident and Design Engineering (Sam Alexander) has authorized N.P.D. to continue testing. therefore, no tagging is necessary. Risponsibility for Nonconformance Disposition OConst. WDesign OQA Nuclear Production Ocroup f7 fv1 RIportability Evaluation,010, Requested from DM 16 Af FA (Provide Department or N/A) e s E"*"
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{ ._C Ufz)Sf ^ Disposition of Nonconymance ( DNC (PR 202) Applicable (Design Eng. Only) O ve. O No Spec / Calc /Dwg Revised Rev No. R-6A Assigned to Dept. g For 10CFR So App. O Criterion XVI Evaluation RIsolved By Date Technical Approval Date QA Approval Date REWOR K/INSPECTICN/ REPLACEMENT TO IMPLEMENT DISPOSITION Assigned To Performed By Date By Date QA Approval Date ion / inspection Remarks Distributi00 Const Eng con Err: Con Enni Proiect QA OA OA Whse De9'0" Mgr Mgr gf4 QA Mgr V6 dn Supv gg Orig NCI ANI NRC Number of Copies I I I Final Trend Inf o-g g ) Final OA Review Date
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PAGE 1 CF I affected piping, valves, and equipment described below were presurrized at approximately 2000 psig for approximately I j three hours. ~ i
- From the intake side of valves,2N1179A and >2NI178B to isolation valves.2iiS434, 2fil183B,.iN11361ste2NSM. <2N028Any i 2NU33MfJ4D25$, fND24fe, 2bDSSB,.9MDSSDT 2ND90, 2ND91, 2 tid 78, 2NM59, 2NM4BS, 7NMW, S,tigg, 2NM29%- to vent, drain or f
l test vent valves 2ND309 2NDfW, GND3F, TMDTIW2ND24, JJiD73,c2 TID 99, <2ND2% 2ND14, 2ND74. 2ND695 eND20,.2ND??'.*fhBS 7 1 'e2#9121,1N0122, 2ND98.OD170M2ffD4?t -2NDVP5. 81WD9?**4NDM i2ND71% 2ND54, 2ND55. 2NM66, through valves 4NDSN l l4lNDP,6, 2ND19,4N057,4Ra6sfme2NDED78fRIT57t2ND6&, $ftHKi?NH3%'fNM41*r fliM2655 <fNH49 sand through Equip, Residual Heat I j Removal Heat Exchanger 2A and 2B and R.H.R. Loop Sample HX.2 - against discharge side of check valves 2NDia and 2&le throuch relief valves.2NO3M =#8ttp848?N1WF,1NM?9&fwhich nav have lif tedlacainst discharoe side of relief valves l lt2NV278 Will9, fJjlj,2NM988, 2NI169,e2EF35f,*TMHf9, 2NI110 - to vent valves EftB50At4hlL4SD 1)fDdSS, 2NS504% e288&9R l$$BIL496, qts 495il 2Ji,lL426,.2MBRand 2N,810,% and to drain valve.,2f(S5A3J-against intake side of valvesy1NS31J andem which accordino to note #1 on Flow Diaoram CN-1556-1.1 should be locked open when Unit #2 is brought into operation. 1 i ,$'/ l l i i i 1 i e l i J I i I l 1 l l s r cm hm hs/st m n A'38, % 4 der Le w1 r u
f.;ps - ye-S t AFfaekmeat Ao L Pose-I of l ff CI-REQUEST FOR REVIEW The attached NCI is being sent to you for your review and comments. Please respond by completing this form and returning it to the Materials Group. ifCI fiumber: 17632. ~ Materials Group Responsible Engineer SS LGE/EF J'r-c. Materials Group fleed Da'te 5'- 2 2. - Of IS'O 16. fla g es fo r rel.e f valves zdV 273, Z NS 19, 2 AS Ej 3 2AVT69 h 2 Id C> S S' Z Nr 161, zNL I.s*/, 2 NZ /19, 2 H[ 102. ZHD 31 2ND (o4 (CN IS SG-).I) 2 and re,lieE valve. 2 NM 29(a (civ 2 s 72 -1, s-J,we re,sobjecM to $ 2000 ps; pressure. as descriloed by MC-Eg 19, C,3 2. Pleas e. acceplah;lity of so 16. P/ag es a4 ho/fi@ advis e, o s Fo i Ma te-r to:Is followi49 overpcessuy; saf;od, pa te_ gag. S'-8.-e.g-Coments: O NCI is acceptable ICI is not acceptable O No Comments Reason: Q g g Q sL A w 4 9. y e>s& M.o e p.~k u k pk W = 6eo ~ m metaA., 1 % w. 4 aD h an A w % % D3 & A & m a hc~d. W +.
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Specification / Calculation /Dra' wing Revised by y Catawba Stress Analysis: d/A Specification / Calculation / Drawing to be revised by other groups: h3/4 By: (,ki Technical Approva : e D
,~ :,.,.. MOS-Je-.-5~/ A Iof e AHaeh m ea t do. Z. NCI-REQUEST FOR REVIEW The attached NCI is being sent to you for your review and comments. Please respond by completing this form and returning it to the Materials Group. NCI Number: /7 6 3 2. Materials Group Responsible Engineer SS LQIler Te. ~ c. Materials Group Need Da'te 5'- 2 2. - OS 15 0 lb. fla % es fo r telle f valves zdV 273,2NSI4, 2MS2
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ZAID 31, 2ND 64 (CN 15S4-/ 8) y nd relieE volve z nM 296 (ctv 2 5 72 -1, r),we r e. sobjec. fed to f a y jooo psi Pressure. as descrlked by Nc.rg /9,43 2. Please. occepkh:ltfy e5 So lh. Pla9 es & ho//i J9 advis e, as to J M a te-r wls foflowi43 overpressuy; saf;od, pape,g,4 5-g gg. Cor.nents: O NCI is acceptable f 55 NCI is not acceptable, S cep t 45 Ho 7ed ho low. O No comments Reason: The t.6 r 1" - (60 lb Vinnys \\mp b e.cn ~ f em om, ty de foru,c) Gorn rhc Tooofm G fvcS w Ys. %m fla y c3 h ud to b e. y he bo b 4 A1,9vsl can h c. vcur<d sinc.c rlte yrp qcq, pr ss m d,4 g,7 e y e v m an w ty A q C <>n rhc hahs. (so a, tach <4 c teuta,io,,s), a f R e. *z.% A 300 lb Daups sva. s,iv et c.ea g ul,le and can Vc.m &. y (Sec atrac%d colcula icts Di Specification / Calculation /Dra' wing Rev sed by Catawba Stress Analysis: R Specification / Calculation / Drawing to be revised by other groups: By: P
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