ML20052E882

LER 82-019/01T-0:on 820417,while Conducting ASME Class I Hydrostatic Test During Shutdown,Water Discovered Leaking from LPCI Check Valve 3/4-inch Test Equalizing Line.Caused by Inadequate Piping Support

ML20052E882
Person / Time
Site:	Dresden
Issue date:	04/27/1982
From:	Hylka R COMMONWEALTH EDISON CO.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION III)
Shared Package
ML20052E879	List: ML20052E878 ML20052E882
References
LER-82-019-01T, LER-82-19-1T, NUDOCS 8205110504
Download: ML20052E882 (3)

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. 60 61.. . oOCKET NuMSER . 68 69 EVENT oATE - 74 75 REPORT oATE 80 EVENT DESCRIPTION AND PROBABLE CONSEQUENCES h l o 12 l l While shutdown and conducting ASME Class I Hydrostatic Test, unter was disenvered leakincl

[o ;3; ;from the LPCI check valve 3/4 inch test equalizing line. Event was of minimal safety l 1 o 14 l Isignificance since all leakage was contained in drywell floor drain system and potential l lo Isi l leakage considering complete severance of a 3/4 inch drain line is within the capabili- l lo l6 l l ties of ECCS system. There was no effect on public health or safety. Previous occurrence; reported by R.O. 81-18/0lT on Docket 50-249.

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_ sEQuGNTIAL oC0uRRENCE HEPoRT REvistoN LE R/ho EVENT vfAR REPORT No. CooE TYPE No.

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35 36 37 40 41 42 43 CAUSE DESCRIPTION AND CORRECTIVE ACTIONS l i t o j lThe cause of crackinc was determined to be faticue due tn inadecuate nininc connert. The I

[T i , l equalizer line containing the crack was cut out and a modified line with additional sup- I

,,,,, ; port was installed. Hydrostatic testing will continue as required by the inservice [

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NAME OF PREPARER PHONE:

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DEVIATION REPORT Commonwealth Edison DVR N0.

12 + 3 STA UNIT

- 82 YEAR 29 l NO.

l PART f l TITLE OF DEVIATION O CCU R R ED

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Cracked Weld on 3-1501-25A Test Line 4/17/82 1730 D

sYsitM ArrECTED 1500 PLANT STATUS AT TIME OF EVENT TESTING LPCI uDDE S/D , P WR ( M AT ) 0 . LOAD (MAE) 0 y g, y, DESCRIPTION OF EVENT During primary System hydro, cracked weld was discovered on test line from 3-1501-25A. The crack is located in the 3/4 inch test equalizing line for the 3-1501-25A check valve.

to CFR50.72 NRC RED PHONE O NOTIFICATION MADE YES NO EQUIPMENT F A ILURE 19935 Oves O NO Aca REcuEsT NO. RtspoNsleLe suPrRvis0R R. A. Mitzel oATE 4/17/82 PART 2 l OPERATING ENGINEER'S COWENTS All leakage was contained within the drywell floor drain system. The leak will be repaired and retested prior to moving the Rx mode switch from the shutdown position.

O EVENT OF PUBL I C INTEREST ] 24-HOUR NRC NOT I F I C ATI ON RE0'D D TECs. srEC. VIOLATION TELEPH Tom Tongue 4/19/82 0830 REGION III DATE TIME NON REPORTABLE OCCURRENCE TE LE GM/ TE L ECOP Y J KePPl er 4/19/82 0954 14 DAY REPO RT A BL E / T. 56.6.B.l.c. REGION 1It DATE TIME 30 DAY RE P O R T A BL E / T. S .

CECO CORPOR ATE NOTIF IC ATION MADE ANNUAL /SPECL REPORT REC'D IF ABOVE NOTIFICATION IS PER 10CFR21 A.I.R. m 5-DAY WRITTEN REPORT RE0'D PER 10CFR21 L.E.R. *R7-19/01T-0 F. A. Palmer 4/19/82 1203 7gegpg Les Bird 4/19/82 0810 CECO CORPORATE OFFICER DATE TIME PRELIM! NARY REPORT COMPLE TED AND REV I E ACD Michael Wright 4/19/82 vFEHATINu ENGINEER m e , O A Ti )/[ '

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INVESTIGATED REPORT & RESOLUTION , D ACCE PTED BY STATION REVIEA

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M ATTACHMENT TO LICENSEE EVENT REPORT 82-19/0lT-0

' COMMONWEALTH EDISON COMPAIR (CWE) ,

i DRESDEN UNIT #3 (ILDRS3)

DOCKET # 050-249 During the current refueling outage while conducting an ASME Class I Hydrostatic Test, water was discovered dripping from an elbow on a 3/4" drain and equalizer line attached to the bottom of the LPCI testable check valve 3-1501-25A. All leakage was contained inside the drywell and directed to the Drywell Floor Drain System.

The crack occurred at the elbow to pipe socket weld and is thought to be a fatigue failure resulting from inadequate piping support.

Calculations showed that a complete severance of a 3/4 inch line such as this would be well within the capabilities of ECCS system and hence leakage of this magnitude is of minimum safety significance.

The equalizer line containing the crack was cut out and a modified line -

oe .with additional support was-installed. -Ilydrostatic testing of the system

will continue to be performed in accordance with our inservice inspection program to verify system integrity.

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