ML19317D708

Ro:On 741109,during Refueling Shutdown One Person Received Internal Exposure Exceeding 10CFR20.103 Limits.Caused by Failure to Use Respirator While Cleaning Control Rod Drive Lead Screws.Face Mask Filters Required as of 741112 Ltr

ML19317D708
Person / Time
Site:	Oconee
Issue date:	12/09/1974
From:	DUKE POWER CO.
To:
Shared Package
ML19317D654	List: ML19317D660 ML19317D708
References
NUDOCS 7912060927
Download: ML19317D708 (1)

Text

m -

- . ( /

DUIE POWER COMPANY OCONEE UNIT 1 REPORT OF OVEPIXPOSURE PURSUANT TO 10CFR 20.405 On November 9,1974, during the refueling shutdown for Oconee Unit 1, it was found that one of the personnel participating in refueling activities within the Oconee Unit 1 Reactor Building received an internal exposure which exceeded the limits of 10CFR20.103. Exposure to the individual occurred while he was engaged in cleaning control rod drive lead screws.

External contamination was found on the individual during the survey on exiting the Reactor Building. A shower and saline nasal flush removed the external contamination. An initial body burden analysis was performed immediately af ter external decontamination to determine the extent of internal exposure. Follow-up analyses were alsa performed during the interval November 11 to 21, 1974. Based on these analyses, it was calculated that the individual received a maximum dose of 1464 edilirem to the lung and exceeded the airborne concentration limits of 10CFR 20.103.

Activities associated with the cleaning of the control rod drive lead screw mechanisms were improperly conducted in that the radiation work permit did not specify the use of respirators. To assure against a recurrence, the Oconee Nuclear Station Manager issued a November 12, 1974 letter which requires that health physics personnel require the use of face mask filters prior to commencement of any work which could result in exposure to airborne contamination in excess of the limits of 10CFR20.

.