ML20127J480

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Topical Rept-093, Oyster Creek Spray Sys Insp Program for Cycle 14 Refueling Outage
ML20127J480
Person / Time
Site: Oyster Creek
Issue date: 01/15/1993
From: Covill D, Manning W, Nademus R
GENERAL PUBLIC UTILITIES CORP.
To:
Shared Package
ML20127J473 List:
References
TR-093, TR-93, NUDOCS 9301250151
Download: ML20127J480 (18)
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Text

{{#Wiki_filter:- - -. -. ~__.. =. ~ v' Topical Report No. TR-093 Page 1 of 18 9 9 93*AIIH..EET&K CDATt jiER_ AY SYSTEM JJISPECTION PROGRAM - ljR OUTAGE TOPICAL REPORT NO. TR-093 Project No. 328310 'E- /*E#k3._ A'JTPOR t / cf / R. !!ademus, NDE/ISt Engineer Date APPROVALS: .I b 4f [" Y" ' W. P. Hanning, ND SI Manager Date lht&. k }; {sk /~S-95 Date D. 'W. Covill, ggerhHDE/ISI LdL : iInk; / J.'Knubel, Director Quality Assurance Date ~ / s l_v b d ll)5l'73 'L-R. W. Keaten. Director Tech Functions

  1. Da(c' (flignificant Impact Review) i l

1 to;neet 9301250151 930115 DR ADOCK 05000219 i p PDR.,,,,.

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i 3 b i 3 Topical Report No. TR-093 j Page 2 of 18 ABSTRACT i l 1 l During the 1992 ref ueling outage (14R) at Oyster Creek, an augmented inspection program was l perforned on the Core Spray sparger System. In-vcerel annulus piping and spargon assemblies l were inspected utilizing remote visual examination. On addition, an air test was performed. i i Initial visual exarnination revealed no new rolovant indications. The air test found a leak i in a fillet weld on the downeomer of the annulus Core spray system I piping. Further visual enamination of System II revealed two linear indications in the same weld joint configuration l as the air leakage in system I. No leakago was identified during the air test on System.II other than the known leakage at the repair clamp at the 208' azimuth, i i' 4 t i i i l l 1 4 1 i 2 4 topical a. -. -. u,u

Topical Report No. TR-093 Page 3 of 18 9 TABLE OF CONTENTS EAan Introduction 4 Visual Inspections Cere Spray Sparger Core Spray Annulus Piping Air Test 6 Additional Visual Inspection 7 Conclusions 8 References 9 Attachments Table 1 - Core Spray Piping Inspection Summary 10, 11 Figure 1 - Core Spray Annulus Piping Azimuths 12 Figure 2 - General Layout - Core Spray Sparger 13 Figure 3 - Upper Piping Unit 14 rigure 4 - Lower Piping Unit 15 Figure 5 - Pipe Joint Configuration for Downcemore 16 at 60' and 240' Azitoutha Figure 6 - Downcomer at 60 degree azimuth and 17 location of weld U-3A indications Figure 7 - Downcomer at 240 degree azimuth and 18 location of weld L-3A indication -Topical o

i Topical Report No. TR-093 i i Page 4 of 18 i QISIER CREEK CQEE SPRAY SPARQER SYSTEM Il4SPECTION FJt,QQM l i t INTRODUCTION i a j The augmented inspection program for the core Spray Sparger Systein was performed during the present 1992 refueling outage. The results of the inspection are reported herein as required by Sectien 6.9.3.e. "Uninge Reportina Reauirements*, of Oyster Creek'o Technical I Specification, 1 4 1 5 E e f I l i i l ? 2 J i l ropical-

l** Topical Report No. TR-093 Page 5 of 18 k-i i VISUAL EXAMINATLQLS i Core Sorav snaraers l The core spray spargers were visually inspected utilizing a Rees R-93 video camera with twin i 20 Watt auxiliary underwater lighting.. The Rees camera utilizes an iria control which allows better use of existing lighting. The video camera was initially mounted on a pole which was l 1 attached to a fixture mounted on the refueling bridge. Difficulties with the camera mount j to pole led to performing core spray sparger visual examination from the refueling bridge utilizing hand held techniques. All accesuible areas of the piping were inspected. The calibration standard utilized for visual examinations, a one mil wire, was in accordance with the requirements of flRC I & E Bulletin 80-13. l The visual inspections of the spargers were performed as follows: f 1. Downward view of the top of the upper spargers (spargers A & C) f 2. Straight on view of the upper spargers j 3. Upward view of the upper spargers (spargers A & C) i 4. Straight on view of bota upper and lower sparger nozzles. 3 5. Downward view of the top of the lower spazgers (spargers B & D) i 6. Straight on view of the lower spargers. i No relevant indicatior s were noted during the inspections or subsequent review of the video

tapes, t

i Annulus Picino 9 l Visual examination of the core spray annulus piping 1.as performed utilizing General i Electric's (GE) ' Firefly *, a remotely operated vehicle (R.O.V. ). All accessible areas of the 1 piping were inspected. Refer to Figures 1 through 4. No relevant, indications were noted j during the inspection or subsequent review of the video tapes. i l l } i i J d J i i a 1 ' Topical ? 3 - ,a.,.._ ~.. _.~. _,_ -....-.._.. a _..... _ _ _.,

i 4 Topical Report No. TR-093 J l Page 6 of 11 j AIR.. TEST r An air test was performed on Core Spray Sparger Systwas I and II. Because of the configuration of the core spray piping, the upper spargers with downward pointing nozzles I should fill completely with air. The down leg between the reactor vessel penutration and the i horizontal circumferential pipe run in the annulus should fill completely with air. All i other piping will, at best, till only partially with air or just pans air bubbica along its l upper centerline inside surface. l SYSTEM,1 (Lower Spargers) observation of the core Spray Sparger System during the initial air test was performed by hand held techniques utilizing the Rees cameira. During System I air test (Lovar Spargers and the first system to be air tested), air bubbles were observed coming f rom the nozzles. The air pressure as read from the RKO rack, where air was being injected was. 60 psi (proc 5 dure allows up to 100 psi), dhile looking/ waiting for air buobles to come out of the conter of the sparger, which normally trickled out, it was observed that bubbles were coming out of the annulus area. Further investigation revealed that bubbles were leaking out of the fillet weld designated as L-3A, 240' azimuth (see rigure 5 for joint configuration and wold type). Tua location of the leak was at the point along the circumference of the weld nearest to the vessel wall. A direct straight on picture utilizing the hand held technique was not possible due to theno restrictions. The R.O.V. was maneuvered at this time to obtain a direct straight on picture. Although the R.O.V. was able to get a better picture, the actual defect (point where air bubbles were escaping) was not seen. The picture clearly showed that the bubbles were coming from the weld; but, it was a side view and was not abic to show the defect type, rurther inspection of the balance of tbo i annulus piping and lower spargers revealed no other indications or air Icaks. i l AYKIsli u (Upper Spargers) Observation of the Core Spray Sparger System during the air test was performed utilizing a hand held technique for the sparger and the R.O.V. was utilized for the annulus piping. Air bubbles were observed coming from the nozzles as expected. A steady stream of air bubbles were observed coming from the end (204*) ani middle (208*) of the repair clamp located at azimuth 204* to 210'. No other air bubbles were observed coming from the other eight repair elamps, the spargers themselves, or the annulus piping, r D l l l 1 ropical .u .u. .--.m..

i Topical Report No. TR-093 (' l Page 7 of 18 i ~ 1 l 6PALTlQUAL.VI@.5kl.XNf1NATIQNS _J231W2CJRII.E INoICATJRU R QATED DURING AIR TEST 4 1 4 i A special fixture was made to, "stion the camera behind the annu1vs piping. The initial { camera used was a color Emco camera in a water proof housing. This camera was experimental i and was never used previously in a reactor vessel. It was approximately 1 inch in diameter, 1 inch smaller than the Rees. These areas have not been inspected before becauso of i accessibility. The first inspection was on the downcomer located at the 60* azimuth, Sy.ptern II weld U-3A. r The camera was positioned above the weld, looking down. The pictures show what appears to ~ l be splits or tears between weld passes. With the colot picture, we observed a reddish color coating the metal (weld and pipe). The splits or tears. have the - sama reddish color indicating that these are not new. Xf they were new indications, a shiny metal or reficction - i would probably be evident. These indications are most likoly construction defects. These two indications did not leak any air during air testing. See Figura 3 f, 6 for additioneJ-4 i location information. During removal of the camera from System II, the cable was pv11ed out of the tube and the camera was no longer operabic. } The same technique was utilized for further inspection of fiyaten I weld L-3A, downcomer azimuth 240*, leaker found during air test. The Rees R-93 camera with additional lighting l f rom the R.O.V. was used. The camera, af ter many atternpts, '.tas positioned above the weld and l looking down. The picture clearly shows a rounded hole, approximately 1/8 inch in diameter or smaller located-in the weld. This hole appears-to be a construction defect. Per ASME, Section XI. 1986 Edition, Weld L-3A hr.s no other service induced indications. Weld L-3A wun 100% VT-1 inspected. See Figurca J., and 7 for locations. d i 4 I i i L } t 4 A .I e e 4 d I 4. Toplest i. v,--.-

Topical Report No. TR-093 Page 8 of 18 QQNCLUSIONS Following completion of all inspections relative to the In-Vessel Corn Spray System, a review was conducted and the following conclusions were reached from this review. The number of confirmed cracks in the sparger assemblies is one (1) in System II, that being the through-wall crac< at 208' identified and clamped in 1078 and confirmed by a continuors supply of air bubbles during the air test. No change from previour inspections. Visual inspection of the spargers showed various scuff marks, scrapes, undercut a id discolorations on the sparger surface. No change from previous inspections. All repair cleps appeared to be intact and in good condition. e No indiention that could be interpreted as crack-like was noted during the examination or post examination review of the sparger assembly. One rounded, through-weld hole was observed during the air test of the annulus piping, q System I, weld L-3A. This appears to be construction related due to the condition of the fillet weld. Two linear indications were observed during the additional visual examination of 7 annulus piping, System II, both in weld U-3A. These indications appear to be { construction related and no air bubbles were observed during the air test. I 9 e Topacal

Topical Rtport No. TR-093 Page 9 of 18 i i RgTERENCES l I

1) NRC I and E Bulletin 80-13, " Cracking in Core Spray Spargers",

h i

2) GPUN Procedure 6100-QAP-7209.46, Rev. O, Visual Examination for Reactor Vessel Internals.

1 l

3) GPUN sper.ification SP-1302-56-123, Rev.

O, Reactor Vessel Internals Inspecticn 14R outage. I f i 3, I 4 i i 4 9 9 9 E 6 F 9 n - Top 6 cal

...,_.__._...._.~.._-._..._._....____-______.,..-.._..___._._..._._-_.._.___...____.._.__..m_~.- _...m .m.mm.__.. ^ + Topical Report No. TR-093 Page 10 of 18 i r TABLE I CORE SPRAY PIPING INSPECTION

SUMMARY

[ l i Spar Jets - Annulus Pipino i Vista.1 Ultrasonig Visugl Ultrasonic Bir Test Remarks' [ ~ 1978: 1.through. No indications ' Air release One Repair Bracket > wall crack observed from installed at 208* ! 1' crack (208' (Sys II)- j only' I seven Repair f 1980' 19 indications 16 indications 2 indications called cracks Brackets installed ! (Sys II) two repair I brackets installed 4 (Sys I) -28 Total Indications (excluding 1978 -indicatlun) [ I 1982' ~ 1980 visual on 1980 indication Video enhanced Video enhanced. [ video Enhance-indications. Results Results* Not a crack -{ identified: (6 x 5 reducer) 1 ments. i 3 cracks 4 -2 possible cracks j 1983 No indicstions* ' No indications

  • No indications No indications-
  • Area of Inspection
  • l (4 of 1980

.(5 of 16-1980 7 welds limited by repair i indications indications inspected brackets examined) . rechecked) 1986 No indications

  • No' indications
  • No indications' t

1989' No indications *' No indications

    • Air release
    • Nir releare-f obnerved from from 196* regair !

repair brackets bracket inter- ) upper sparger' . mittent. Adr- ) release from i j' 208* repair 4 l-bracket con-. I tinuous r I f b ? ' DE$Cf5 '1

.._..__._..._........_.m..-... -.--.. _ m. -.. _.. ~.... ~.. ~ _. _ _. ~ L I Topical Report No, TR-093 Page 11 of 18 TABLE 1.(Continued) CORE SPRAY PIPING INSPECTION

SUMMARY

i s ~ SDeraerp. Annulus Pininq visual Ultrasonic"- Visual Ultrasonic Air Test Remarks l ? No indications Air release Airreleasefrom'! %i No indications

  • i 1991 observed from 208* repair l

one repair bracket. I-bracket (208") continuous. j upper sparger. (Sys.II) + i '1992 No indications *- Initial no Air release ' Air release from:.I indic. :., ins observed from. 208* repair bracket ; ' I repair bracket continuous (Sys.II) "!

      • Additional visual 6

3 indications Air release from Air release from, A) l'through weld downcomuner at. weld L-3A is t .+? hole' 240*. Weld L-3A continuous l t 3 B) 2-linear .has through weld ( S-es. I) hole. i. i i i

  • .. Area of. inspection' limited by repair brackets A subsequent sir-test confirmed that air bubbles were' released from the'sparger nozzles beneath'the 196* repair clamp.

i

      • Through veld hole in weld L-3A. System I

.l ?' 2.linears, both in.eame weld U-3A System II j" t i i ?! ' Topical t-s

Topical Report No. TR-093 Page 12 of 18 364* \\T 330* I' it' LOCAT10N it 'N 84' 60* 67' <-LourtR RtSER l k+9, y Ji n -UPPER RISER ! s 1 1 N .g C 7 j es ashs ~ gg. l l 154' 11 g/ 5 J T sor LOCATION DO* tos' iede i TT4' CORE SPMY ANNULUS P1 PING AZ1MTTH I t F1GURE NUMBER 1 I OYSTER CREEK NUCLEAR GENERATING STATION T,a

.~.. i TopicG1 Report No. TR-093 Page 13 of Id s !i* 4, i 1 1 i i i i i CORE $ PRAY' i ) RISERS \\rM CORE SPRAY SPARGER =f l w l y r 1 3 i i i k i l' i ) ,j. $HROUD SUIDE R00 BRACKIT 4 RGURE NUMBER 2 - t OYSTER CREEK NUCGAR GENERATING STATION 1 .Topal

Topical Report-No. TR-093 i Paga 24 of 18-1 a 1 1 faC t-i i 44 1 ~ as-3 w ./.1 w-M 350' w M. s4 Met u.41 u-o f t u.5 w u.iz ' 4#=T Usfl w; g

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_~ Topical Report No. TR-093 Pago 15 of 18 f f f 2 w o' L1 o 12 w i fe " Z '. I A

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Topical Report No. TR-093 'j j Paga 16 of 18 l l-- j l.; OYSTER CREEK CORE-SPRAY-SPARGER INLET PIPE COUPLING VESSEL WALL-6* SCH 40 l PIPE l.OCATION FIELD i I/4 v WELD l \\N N ( h VESSEL i N

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Topical Rsport No._TR-093 i. Paga 17 of la {. 1 i CORE SPRAY f/fMt WEl.D I.b. 's INbl9TibN KrWELD U-3A i i i i l / / / l~ VEssrt l/ / SH4 ado i / / 0-2 / / 7 l / / U-3 -s .U-34 t V ft.o u) y.y. i porcswJ '/$ o ri ' 1*NF l .VESSR S44* -l, 2, l't "wc v l' .4-L s e c j. i: '. Twical.: o + m-m.. . _.m. _.~._,

._.~. _._. .l j - Topical Report No. TR-093-Pags 18 of 18 f j-, i i i COR[ SPRM PIPIN6 WELD.T.D 3 i, UMER AT WEl.0 L-3A t;- i / i /. / L -'- / VESSEL lSH40" l . t-z / / - t l / l / / t.s i b 4 34 aua. i FL osJ g, _ q N i i l' l i f i- - L.f i a p F FlWRE 7 l' d f i ? j ' Tcywal s t -~ n-y-. r wra y + 3 v .,c,,.a, 4-w- ..ei.e<<-

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