ML20024B640

LER 83-044/03L-0:on 830603,review of Area X Temp Showed Increase of Approx 25 F Due to Crack in Test Tap on MSIV 2C. Caused by Fatigue Due to Improper Support of 3/4-inch Test Connection.Steam Line Cut & capped.W/830630 Ltr

ML20024B640
Person / Time
Site:	Dresden
Issue date:	06/30/1983
From:	Maxwell D, Scott D COMMONWEALTH EDISON CO.
To:	James Keppler NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION III)
References
83-650, LER-83-044-03L-01, LER-83-44-3L-1, NUDOCS 8307110115
Download: ML20024B640 (3)

Text

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EVENT DESCRIPTION ANO PROBABLE CONSEQUENCES h 10121 l Durine normal ooeration a review of X area temnerature showed an increase of I l O 13 l l approximately 25 degrees. A visual inspection of the area showed a test tao I IoI4II downstream of 2C MSIV leakine. The unit was shutdown for renairs. There was nn I 10151 I effect on oublic health and safety as all leakane was contained within secondary

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i 1016 I I rnnen4 nmane. Thic 4e eho f4ree occurrence of a test connection nine crackine l lO17l l in the main steam piping. I 10181 l  !

7 aa 80 SYSTEM CALSE CAUSE C O M P. VAL %E CODE CODE SUSCODE COMPCNENT CODE SUSCODE SU9C00E 10191 7 8 l Cl Clh l Elh l Bl@ l pl 1l Pl El Xl Xlh l Alh lZ lh 9 to 11 12 13 '8 is 20

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47 CAUSE DESCRIPTION ANO CORRECTIVE ACTIONS h IiI0Ii The cause of the failure was faticue due to innroner sunoort of the 3/4 l 11 iillinch test connection resultino in a vibrneinn indiscod nerpsm crnck in an i Iii2Il elbow fillet weld. Because the test can was nn loncer tand the line was cut I j

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-- Dresden Nuclear Power St:tlin R.R. #1 Morris, Illinois 60450 Telephone 815/942-2920 June 30, 1983 DJS Ltr #83-650 James G. Keppler, Regional Administrator Region III U.S. Nuclear Regulatory Commission 799 Roosevelt Road Glen Ellyn, IL 60137 Reportable Occurrence Report #83-44/03L-0, Docket #050-237 is being submitted to your office in accordance with Dresden Nuclear Power Station Technical Specification 6.6.B.2.(d), abnormal degradation of systems other than those specified in item B.1.e. above designed to contain radioactive material resulting from the fission process.

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D. Scott Station Superintendent Dresden Nuclear Power Station DJS/kjl Enclosure cc: Director of Inspection & Enforcement Director of Management Information & Program Control U.S. NRC, Document Management Branch File /NRC l

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DEVIATION REPORT --

, @ Commonwealth Edison PART 1l 71TtE OF DEvl ATION Ovn No. 12 .

STA 2

UNIT

- 83 YEAR

- 83 NO.

i OCCURRED ,

6/1/R3 0110" Failure of 3/4" Test Connection on 2C Main Steam Line care m.

SYSTEM AFFECTED 250 PLANT STATUS AT TIME CF EVENT TESTING Main Steam ye og Run

. PwRtM*T) 2E , Lo,g;y,g3 W y CESCRtPTION OF EVENT s

Review of X area temoeratures showed acorodinately 250F increase during 6/2/83. An upward trend was noted in the reactor building vent' stack radiation monitor reading. Subsequent leak inspection disclosed

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x excessive steam leakage into the X area, from an unknown source.

N 10 CFR50.72 NRC REO PHONE C @

NOTIFICATION MADE YES NO ECUIPMENT FAILURE D28344 GYES NO WORK REQUEST NO. RESPONSl9LE SUPERVsSOR Michael Wright eart 6/3/83 P ART 2 l OPERATING ENGINEER'S COWENTS x; An orderly load reduction was initiated to allow an X area inspection, which s disclosed a crack in the test tap on 2C steam line, downstream of the s

outboard MSIV on C steam line. (Out side.of pri. cont. boundary).

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A 1L g EVENT OF PUBL TC INTEREST ] 24 HOUR NRC NOTIFICATICN REQ'O (Courtesy)

Stan Stacek

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TECH. SPEC. VIOLATION TELEPH 6/3/83 1300 N REGION 11I DATE TIME

[ NON REPORTABLE OCCURRENCE TELEGM/ TELECOPY N/A O 1 A DAY REPORTABLE /T.S. REGION 111 OATE TIME Q 30 DAY REPORTABLE /T.S.6. 6. B. 2.d , p ANNUAL /SPECL REPORT RE0'O IF ABOVE NOTIFICATION IS PER 10CFR21 s

A.I.R. #

] S. DAY #RITTEN REPORT REQ'O PER 10CFR21 L.E.R.

• Wi-44 /017 -0 Telecopy i " Dennis P. Galle 6/3/83 1433

- Ch*Ca CORPCRATE OFFICER DATE TIME PRELIMINARY REPORT 4 COMPLETED AND REVIEWED Michael Wright 6/3/83 OPER ATl NG ENG t NEER _ / CATF /

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INVESTI GATED RE*0RT & RESOLUTION y' ACCEPTED BY STATION REVIEN

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' RESOLUTION APPROVED AND

. AUTHORIZED FOR 01STR10UTION --

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