ML20085C918

Ro:On 741017,during Removal of Faulty Intermediate Range Monitor 18 Detector,Detector Became Stuck in Shuttle Tube. Caused by Coupling Between Shuttle & Drive Tubes Overtightened.New Shuttle Tube Ordered

ML20085C918
Person / Time
Site:	Quad Cities
Issue date:	11/15/1974
From:	Kalivianakis N COMMONWEALTH EDISON CO.
To:	Oleary J US ATOMIC ENERGY COMMISSION (AEC)
References
NJK-74-383, NUDOCS 8307130210
Download: ML20085C918 (2)

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Ouad-Citics Generating Station Post Office Box 216

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Cordova, Illinois 61242 Telephone 303/654 2241 .

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November 15, 1974  %

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Mr. John F. O' Leary, Director Directorate of Licensing Regulation U. S. ATCEIC ENERGY CC:S!ISSION Washingten, D. C. 20545

REFERENCE:

Quad-Cities Nuclear Power Statica Docket No.50-25h, DPR-29 Appendix A. Section 6.6.B.2.b.

Dear Mr. O' Leary:

Enclosed please find the following Unusual Event Report for Quad-Citics Nuclear Power Station.

This report is su'cmitted to you in accordance with the requiremenv; of Technical Specification 6.6.B.2.

Very truly yours, CCE0?inTALTH EDISON CCMPAhT QUAD-CITIES NUCLEAR POWER STATION

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N. J. halivianakin Station Superintendent NJK/RP/dkp cc Region III, Directorate of Regulatory Operations J. S. Abel'

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8307130210 741115

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h Jjr.PODT DATE: 11-15-74. ,

DFNIAT10'! D'.TK: 10-17-74 fI JDE'lTIFICATIO!! 0F UliU$UAJ, EVE!iT: _

Unit 1 IP21 f18 is stuck in the schuttle tube in the core. O CO'; DTTIO!:S Pi?IOR TO U'! USUAL EVTliT:

Reac. tor in shutdown mode. ,

i pffCRIPTION OF (GUSUAL ITit;T: _

I!M //18 detcetor was removcd on 10-16-74 to replace the drive tube. The de-tector wau reinstallcd in the new drive tube and was found to bc inopcrative.

On 10-17-74 the fuel handlers atterptcd to rcmove the faulty detector when it became stuck in the schuttle tube. The dctcetor was unable to Tech be rc=cved Specs

,and was left in the core cince it is within its norcal boundry.

do allow one IIDI per channel to be bypasscd.

APPA RENT CAUSE OF UO.!SUAL EVF1.T:

It Equipment failure - the IE4 detcetor bccarne stuck in the schuttle tube.

is pocsible that the ccupling between the schuttle tubc and the drive tube was over tightencd and causcd the o-ring to be forecd into the tube arca.

This may have cauccd a rcstriction schich cauced the insulation on the dc-

• tector to become torn and bound when installing the dctcetor.

ANALYSIS OP UNUS"AL E'.T.7:

Safcty of the reactor is not affceted. Houever, if another IE4 in the same channel.becoces incperative Unit 1 will have to operate in the IEi region with a half-scram. Scven of the eight ICI's are operational at this time.

, CORRECTIVE ACTION:

A new schuttle tube has been ordercd. When the schuttle tube has arrived the IIM and its associated schuttle tube will be replaced during cnout.ag'c on Unit 1.

- FAILURE DATA:

This is the first time that this has happencd at QCNPS, thcrefore, there is no failure data available at this time.

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