ML20084S745

AO 50-265/75-19:on 750523,break Discovered in Clean Up Sys Pipe Weld.Caused by Vibration Stressed Weld.Weld Plug Installed.Line Will Be Replaced in Future

ML20084S745
Person / Time
Site:	Quad Cities
Issue date:	05/30/1975
From:	Kalivianakis N COMMONWEALTH EDISON CO.
To:	Office of Nuclear Reactor Regulation
Shared Package
ML20084S748	List: ML20084S745 ML20084S749
References
AO-50-265-75-19, NJK-75-299, NUDOCS 8306170213
Download: ML20084S745 (2)

Text

1

~

h I, E 6'

% . c

mr.$n.vri:11 Edisen

/ CO " i Quad-Cn. Generat;ng Station

'~~

,/o dIf rx/k, A j

'-d Post Off co box 216

\ b'//7 Cordova,luinois61242 'k' y\ }> j Q 'y'/N \

t L

Ay Telephone 309/654-2241 A

{

a \ t NJK-75-299  ? Jllt!s 1975r: s g'3 t

tiay 30, 1975 g "$,M"2' 6 i 5?NNb kII

&ngGy, I l

Directorate of Office of Nuclear Reactor Regulation l U. S. HUCLEAR REGULATORY COMMISSION j Washington, D. C. 20555 1 l

REFERENCE:

Quad-Cities Nuclear Power Station Docket No. 50-265, DPR-30, Unit 2 Appendix A, Sections 1.0.A.5, 3.7.A.2, 6.6.B.l.a '

Enclosed please find Abnormal Occurrence Report No. A0-50-265/75-19 for Quad-Citics Nuclear Power Station. This occurrence was previously reported to Region li t , Directorate of Regulatory Operations by telephone on May 24, 1975 and to you and P,cgion li t , Directorate of Regulatory Operations by telecopy on May 24, 1975 This report is submitted to you in accordance with the requirements of Tech-nical Specificatien 6.6.8.1.a.

Very truly yours, COMMONWEALTH EDIS0N COMPANY QUAD-C IT I ES NUCLEAR P0'..'ER STAT ION l c N' 4W N. J. Kalivianakis C Station Superintendent NJK:TLS/dkp cc: Region 111, Directorate of Regulatory Operations J. S. Abel .

8306170213 750530 PDR ADOCK 05000265 PDR S

l

. . . . k , .

REPORT NUMBER: A0-50-265/75-19 .

REPORT DATE: May 30, 1975 0CCURRENCE DATE: May 23, 1975 -

FACILITY: Quad Cities Nuclear Power Station Cordova, Illinois 62142

'lDENTIFICATION OF OCCURRENCE:

Clean up system pipe weld break Unit Two.

CONDITIONS PRIOR TO OCCURREdCE:

Run mode at 712 MWe.

DESCRIPTION OF OCCURRENCE:

On May 22, 1975 the reactor building vent system air activity increased significantly.

This led the rad-chem department'to suspect a system leak somewhere within the reactor building. On May 23, at 8:30PM, an operator making rounds in search of a steam leak found steam issuing from a pipe in the clean up heat exchange room. At 9:30PM, the leak was isolated and identified as a 3/4" test connection (PX) weld from the 3/4" line to the weld-0-Ict on the 4" line (2-1205-4"A) between the 2-1201-30 and 2-1201-82 valves.

DESIGNATION OF APPARENT CAUSE OF OCCURRENCE:

Equipment Failure: A vibration stressed weld is designated the apparent cause of

'the occurrence. The. weld failure occurred as.a crack in the heat effected zone.

ANALYSIS OF OCCURRENCE:

Since the leak was isolated upon i ts discovery, a minimum amount of radioactive contamination ~was released from the clean up heat exchange room. The-reactor-building vent stack technical specification limits were not exceeded. There-fore the health and safety of the public were not affected by this occurrence.

CORRECTIVE ACTION:

The test (PX) connection was removed to the affected weld at the weld-o-let and a-weld plug was installed. - The line will be replaced in the future as necessary to

• facilitate leak rate testing. .

FAILURE DATA:

ITest connection (PX) line weld failures have not occurred previously in this system.

Therefore, there are no safety implications from cumulative experience related to this occdrrence. .

% ,.,,fn - --

r mw y-+we- . - , , -,*y--, , r, , --g- 1., --,- , 4 -,ww _.v, y e , y--r