ML19308A512

RO on 741009 & 10:inadvertent Release of Radioactive Matl. Cause Under Investigation

ML19308A512
Person / Time
Site:	Three Mile Island
Issue date:	10/11/1974
From:	Herbein J METROPOLITAN EDISON CO.
To:
References
NUDOCS 7910250747
Download: ML19308A512 (2)

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"ETDC?DLii?N EDISCN CC.'.'P.\NY sv swimorcentanevaucununcscvNronsncs

)ST OFFICE DOX 400 MIDDLETOWN. PENNSYLVANIA 17037 ' TELEPHONE 717-c44-4041 c

Octcher'.ll,1974 fir. J.P. O'r.cilly, Director D' D

Directorate Of P.2culatorf .

P.egica I . oW -

9g i" r 631 Par % f.vance King Of Prussia, Pa. 19405' s- 4 }L u d~ . A Ag..- D M

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. Operating License DPP.-50 A .

Docket 50-2CT - '

Subject:

Inadvertant release of radioactiva catorial at Tl!I. '

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Dear I:

r. O'Ibilly: -

This telegra.wis to confir:: the telecca.batneen Lee Spessard'(E gien I-AECT, and J.G. lierbein-(Station: Superintendent) at IC00. hours 10 Octcher 1974.

On Octch r 9 510,1974, an in::dvertant releasecof radioactive esterial occurred over a. tir.:rpericd of 2 hours2.314815e-5 days <br />5.555556e-4 hours <br />3.306878e-6 weeks <br />7.61e-7 months <br /> and 33"cinut:3. .

f.nalysis of radictica.. effle:nt canitor recorder charts and leckl air samples indiccta the radio::ctive caterfalt rolcased uas prcCainately Xel33; and that the instcntan cus cable gr.s release rato es 2.92 x IGT t3/::cc., which is -

bolca the technical specification limit of 1.2 x 103 a3/sec. The averace rolesse rate over the 2 hour2.314815e-5 days <br />5.555556e-4 hours <br />3.306878e-6 weeks <br />7.61e-7 months <br /> cr,d ':0 minuta ocric4 of this rolcase was.l.37 x 104 c3/sec. with a total release of nobic chs of 36.6 curies.

Operating parsennel in the auxilicry building ware 1: adiately evacuated and tonitorir.3 indicated no ccatacination. . ,

The c=ct cause of the ir,sdrartant rcdio:ctiva catcrial rale:sc has not been detar. ined at this tica. A sp'cial cectir.g t:as held by key separvisory personnel at *itil and a cc prchensiva propr.u uns. cst blish2d to covar additic.al radiction. :nitoring requircn2nts, speciiic ifcaith Physics pr.cticas to tc folle::d, sp:cial cparaticnal ranitoring requirc :nts cnd indivifual responsibilities and caning r:quircants for all evoluucn3 in.the i.:I P.cdd!asto facility.

This ir.:ident r.ay have caused the relaa:;e of radio:ictive cataricLs 791025 in con 7 9ca W traticas report:ble un:'cr paragr.:ph 20.Q3 (b) (2) cT ICOTP.20. This aspect of O

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the ir.cid:nt will be cddressed in our 10 du Monroutfr.e Report (4. l t.

Very Truly yours, l

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i J.G. Herbein. t

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