ML19317D970
| ML19317D970 | |
| Person / Time | |
|---|---|
| Site: | Oconee  |
| Issue date: | 02/13/1975 |
| From: | DUKE POWER CO. |
| To: | |
| Shared Package | |
| ML19317D966 | List: |
| References | |
| RO-269-75-01, RO-269-75-1, NUDOCS 7912100655 | |
| Download: ML19317D970 (2) | |
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i DUKE POWER COMPANY OCONEE UNIT 1 Report No.:
UE-269/75-1 Report Date:
February 13, 1975 g
Event Date: January 1, 1975 Facility: Oconee Unit 1, Seneca, South Carolina Identification of Event: Radiation exposure in excess of Oconee administrative limits Conditions Prior to Event: N/A Description of Event:
On January 1, 1975, four health physics technicians at Oconee Unit 1 received radiation doses in excess of administratively imposed limitations while they were cleaning the reactor coolant pump seal supply filters. There were no exposures in excess of NRC limits.
The cleaning of reactor coolant pump seal supply filters is necessary for continued operation of the pumps. Although the radiation levels on the filters have not been excessive in the past, filters reading from 2-200R per hour on contact are frequent at this time. These filters are transported in a lead shielded cart and are kept in shielded containers in the decon-tamination facility until they are removed for decontamination. The health physics technicians were aware of, and reported, their exposures to the health physics supervisor. The health physics supervisor was controlling exposure to 1,000 millirem when, in fact, he should have controlled it to 100 millirem in accordance with Oconee administrative procedures.
Designation of Apparent Cause of Event:
During the refueling shutdown, the station Manager granted permission for these four health physics technicians to receive up to a total of 1,000 millirem any time during the fourth quarter of the year.
The health physics supervisor assumed that he was controlling the dose to this limit; however, January 1, 1975 was the first day of a new quarter and permission had not been given for exposure in excess of 100 m'1111 rem per week. The apparent cause of this event was the health physics supervisor's failure to realize that approval from the station Manager to receive doses at a rate greater than 100 mrem per week did not carry over to the new quarter.
Analysis of Event:
This incident resulted in four health physics technicians receivi ; exposure at a rate greater than 100 millirem per week without prior approval of the 1912 lo o 65 5-
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station Manager.
No NRC exposure limits were exceeded and since the men were aware of and reporting their exposure there was no possibility of exceeding these limits.
It is concluded that the health and safety of station personnel was not affected.
Corrective Action:
The following corrective actionhas been or will be taken to prevent re-currence of this event:
1.
The station Manager is reviewing appropriate corrective action to reduce plugging of the seal supply filters.
2.
A procedure for cleaning the filters has been prepared which incorporates appropriate health physics controls.
3.
The Health Physics Supervisor will inform the Health Physics Staff, Station Management, and other station personnel in writing, in advance of quarterly changes, advising them of allowable dose limits for continued station work.
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