ML17037C219

Letter Acknowledging Receipt of the June 21, 1973 Letter Reporting the Exposure of an Individual to Radioactive Material and Advising That the Matter Will Be Examined During a Future Inspection

ML17037C219
Person / Time
Site:	Nine Mile Point
Issue date:	07/16/1973
From:	Jennifer Davis US Atomic Energy Commission (AEC)
To:	Burt P Niagara Mohawk Power Corp
References
Download: ML17037C219 (8)

Text

In reply refer to:

RO:RPB 50-220 JUL1$ gg Niagara Ymhawk Power Corporation ATTN:

1h'. P. Allistcx Burt General Superintendent-Nuclear Generation P. 0. Boz 32 Lycoming, Near York 13093 gentlemen:

This ~;ill acknowledge receipt of your letter dated June 21, 1973, reporting the exposure of an individual to radioactive material during the Second Quarter 1973.

This matter vill be e~oined during a future inspection.

Very truly yours, bcc:

w/cpy ltr dtd 6/21/73 D. J. Skovholt J.

G. Keppler J. P. O'Reilly H. D. Thornburg C. F. Eason PDR Local PDR NIS DTXE DR Reading-Files DR Central Files Incident Files, RO Files 4F.'~fIIpl sigoOII by 8 Oi TboIIIboIg John G. Davis, D puty Directox for Field Operations Directorate of Regulatory Operations OFFICEI SURNAME >

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Form hEC-318 (Rcv. 9-53) hECM 0240 OaO etO 10 8!i0$

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NIAGARAMOHAWKPOWER CORPORATION NIAGARA s

'OHAWK Nine Mile Point Nuclear Station Post Office Box 32

Lycoming, New York 13093 June 21, 1973 Director, Division of Compliance United'tates Atomic Energy Commission Washington, D.

C.

20545

Dear Sir:

Re:

Provisional Operating License:

DPR-17 Docket No.:

50-220 This report along with an attachment is sent to you in compliance with 10 CFR 20.405 (Reports of overexposures and excessive levels and concentrations)

,.The individual named in the attachment received an exposure of 3350 mrem to the whole body during the second calendar quarter, 1973

( i.e. April 8, 1973 to June 30, 1973).

The individual's film and self reading dosimeter records show the following results:

Period of E osure Whole Body Exposures mrem Self-reading Film Dosimeter Badge 4/08/73 to 4/21/73 4/22/73 to 5/05/73 5/06/73 to 5/19/73 5/20/73 to 6/02/73 200 690 940 340 2170 260 890 1900 300 3350 We received a telegram from our film badge service on May 25, 1973 informing us that the individual in question received 1900 mrem for the period May 6, 1973 to May 19, 1973; this exposure value put him over the 3 Rem/qtr. limit.

We immediately prohibited this man from entering any restricted areas so that he would receive no more exposure for this calendar quart'er.

Between the time the badge was sent'n and the time we received the telegram,

however, he rece'ived an additional 300 mrem.

As can be seen from the above table of dosimeter readings versus film badge

readings, there is a large di*screpancy between the two readings for the period May 6, 1973 to May 19, 1973 (i.e.

1900 mrem vs.

940 mrem).

The individual's self reading dosimeter was calibrated and at two different dose rates (400 mr/hr.

and 25 mr/hr.).

The dosimeter showed a +

15'o accuracy.

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Director, Division of Compliance June 21, 1973 United States Ato Energy Commission

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An inte'rv'iew with the 'individual failed to adequately explain why there should be such a large discrepancy.

The two week period in question (5/6/73 to 5/19/73) involved only four (4) days of work in a Radiation Area or Hi Radiation Areas (drywell maintenance work during shutdown)

'nd a review of the radiation work permits for.these four days indicate that the 940 mrem as read by the dosimeter would not be an unreasonable exposure; It should be pointed out, however, if we assume the individual in question received the maximum dose that any man on each R.N.P. received he could have received 2050 mrem for the two week period.

This leads one to believe that the individual allowed his dosimeter to go off scale and might have been reporting inaccurate exposure results based on dose rate estimates.

In order to prevent a recurrence, we plan to re-instruct all individuals at the Station to keep a constant watch on their dosimeters so that no off scale readings are encountered; we plan to purchase a TLD dosimeter system with in-house capability.

TLD dosimeters will be issued to men involved in the higher dose 'rate jobs (such as drywell work during a shutdown) this should help to eliminate "off scale" occurances, provide more accurate. dosimetry and allow immediate on-site read out to ensure that no limits are exceeded.

Very truly yours, P. Allister Burt General Superintendent Nuclear Generation PAB:cm Enclosure cc:

Region I, Division of Compliance

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JUNE 21, 1973 Provisional Operating License:

DPR-17 Docket No.:

50-220 ATTACHMENT TO 10 CFR 20.405 REPORT Name of Individual Exposed:

Social Security Number:

Date of Birth:

Exposure - Lifetime to Date:

Exposure - Year 1973.'to date:

Exposure - Second Quarter 1973:

Thomas A. Masuicca 076-16-3733 March 31, 1919 12.58 Rem 4.09 Rem 3.35 Rem

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