ML20050D477

LER 82-014/03L-0:on 820317,crack Discovered in Head Seal Leak Detection Piping.Cause Undetermined.Leakage Located in Section of Pipe That Cannot Be Isolated.Analysis & Repairs to Be Done Following Cavity Drain Down

ML20050D477
Person / Time
Site:	Dresden
Issue date:	03/30/1982
From:	Bergan G COMMONWEALTH EDISON CO.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION III)
Shared Package
ML20050D471	List: ML20050D470 ML20050D477
References
LER-82-014-03L, LER-82-14-3L, NUDOCS 8204120240
Download: ML20050D477 (3)

Text

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LICENSEE EVENT REPORT CC'NTROL BLOCK: l l l l l lh 6

(PLEASE PRINT OR TYPE ALL CEQUIT.ED INFO 7.MATIONI il 0 l Ii l9 l I l tUCENSEE

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I D l CODEP l S !143 lhl 15 0 l 0 l - l 0UCENst 10 lNvueEn 0 l 0 l0 l - l 0 25I 0 l@l 2e 4UCENSE l1 l1l1l1l@l TYPE Jo 57 CAT S4 l@

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EVENT CESCRIPTION ANO PROBABLE CONSEQUENCES lo(2l l During refueling, dripping water with the drywell was traced to a .25 inch through-wall t g 3 g crack in the .50 inch head seal leak detection piping located approximately 3 feet from g vessel flange. This event was of minimal safety significance because all leakage was ,

contained in the drywell floor drain system and potential leakage is within the capabil- g ity of the emergency core cooling systems. First occurrence of this type on the seal ,

leak detection system at Dresden, u

l 018 l l 7 8 9 0 E CO E Su CODE COMPONENT CODE SUBCODE Su jojol 7 8 lC lI l@ l Elh lB lh l P lI lP lE lX lX lh l A lh l Zlh 9 to 11 12 13 18 19 20

_ SEQUENTIAL OCCummENCE REPont mEvi380N LEm/mo EVENT YEAm mEPomTNO. COCE TYPE NO.

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_ 21 22 23 24 26 27 28 29 30 31 32 EKTN ""Eo"dAC oEPET ** N M woums h #Se*MITTEs po"mEs. s'u"EuY uA ACE"mEm lX 23 QlB 34 l@ lZl@ l Z lh 35 36 3ld 0l0l0l0l lY l@ 40 43 l42 N lh l43N l@ l C l 0 l 9 l 475 lh 44 CAUSE DESCRIPTION ANO CORRECTIVE ACTIONS (1 101 l The cause of the pipe crack is undetermined. Leakaee (approximate 1v 1 drop per minute) l ti;ij lis located in a section of pipe which can not be isolated. Repair and analysis will be I

,,,7, ] accomplished following cavity drain down and reactor vessel head installation. A l

,,,3, jsupplementary report will be issued after the completion of repair and analysis. l IiI4_I I I 7 s 9 so "SiICE sPowtm oTwEm status h "isEoNmY DiscovEmY oEsem* Tion h l1 i s l l H l@ l 0l 0 l 0 l@l N/A l lAlhl Operator Observatigi l A vlTY CO TENT EELEASED OF RELEASE LOCAT10N 0_p mELEASE @

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80 PusuciTy 820412O240 820330 NRC USE ONLY

! lo{ issuto@lOEscaiPrioN s 9 lNl 10 N PDR S ADOCK 05000249 PDR I 68 69 l!!IIIIIIIII l:I 80 3 G. W. Bergan 815-942-2920, X-529 0 NAME OF PREPARER PHONE: 5

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ATTACHMENT TO LICENSEE EVENT REPORT 82-014/03L-0 COPC10NWEALTH EDISON COMPANY (CWE)

DRESDEN UNIT 3 (TT nnc-M DOCKET # 050-249 During the current refueling outage, workers discovered water dripping from the reactor vessel head seal leak detection piping upstream of Valve 3-220-52 approximately three feet from the vessel flange. All leakage was contained .

inside the drywell and directed to the Drywell Floor Drain System.

Upon further investigation, the leakage was determined to be coming from a

.25 inch long through-wall crack in the .5 inch section of piping. The crack was approximately 45 from pipe axis. Calculations show that a complete severance of a .5 inch line such as this would be well within the capabilities of ECCS.

The exact cause of the pipe crack is undetermined at this time. Because the leakage (approximately 1 drop / minute) is not isolatable, repair and analysis will be accomplished following envity drain down and reactor vessel head installation. An updated report will be issued after completion of repair and analysis.

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DEVIATION REPORT f 1 )/ Commonwo-Ith Edison tvR u N_.

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20 NO.

PART 1 l TITtt OF DEvlATION Discovery of Crack in Unit 3 cccuRRto 3-17-82 1700 licad Seal Leakoff Line , ,, ,

s< situ ArrEcTED 220 PLANT status AT TIME CF EVENT TESTINF, Head Leak Detection c/n PARivAT) 0 0 uoDE . , toActuAE) yg [

t E sc ro p r i ON or EVENT Visual inspection following discovery of dripping water in the drywell disclosed a small crack (.25 in.) in the head seal leak detection line on the Rx side of the 3-220-52 valve. The crack is in the .5 in. line.

io crR50.72 NRC RED PHONE C NOTIFIC ATION MADE YES NO E ou i Pvt N T FAltV9E 19350 vrs No AoR. REcurst No. REsPoNsi eur surrRvisoR Michael Wright p,1E 3/18/82 PART 2lOPERATINGENGINEER' SCC *MENTS The line will be repaired and retested following Rx reloading when the Rx cavity is drained. All leakage is contained within the drywell floor drain system.

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l EstNT c5 Pus ic INTEREST Q 2 4-Hous NRc Noti r ic ATI ON REQ'D TE L E Ps M. Jordan 3-17-82 1710 O TECH. sPE . siotATies REGION Iil DATE Tive Nos RtPcRTAntE occuRREN:E tttt cu m EcoPY 3* KePPl er 3-18-82 111h C 14 DAv REPeRT AatE / T. s ,gg,gy ,,, g, a 3e oAv r,E r o R T A r<t E / T . s .6. 6. E . 2. d Ceco CORPORATE NOTIFICATION MADE ANNU AL '$PE Ct REPORT REC'D IF ABOVE NOTIFICATION is PER 10CFR21 A.I.R. e

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3 t.t.R. . 8 2-14 /03L-0 F. A. Palraer 4-1-82 1319 TELEPH Reclassified from a 14 day to a 30 day occurrerOce CORPORATE OrriCER CATE TIVE PE AN EAED M hael Wri pt t & thai th LNdtNEEk _

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