ML19351F671
| ML19351F671 | |
| Person / Time | |
|---|---|
| Site: | Humboldt Bay |
| Issue date: | 01/21/1977 |
| From: | Crane P PACIFIC GAS & ELECTRIC CO. |
| To: | Volgenau E NRC OFFICE OF INSPECTION & ENFORCEMENT (IE) |
| Shared Package | |
| ML19262F417 | List: |
| References | |
| NUDOCS 8102180022 | |
| Download: ML19351F671 (3) | |
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PACIFIC GAS AND E LE C T RIC C C M PANY hbV6
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77 BEALE STREET. S A N F R A N CISCO, C A LIFO R NI A 9*4106. (415 ) 781 4211
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Dr. Ernst Volgenau Office of Inspection and Enforcement U. S. Nuclear Regulatory Commission Washington, D.
C. 20555 Re:
Docket No. 50-133 License No. DPR-7 Humboldt Bay Power Plant Unit No. 3 Dear Dr. Volgonau This report is submitted in accordance with 10 CFR 20.405 (a)
(1) and (b) and involves occupational whole body radiation exposure for one individual in excess of the 3 REM / quarter limit specified in 10 CFR 20.101(b) (1).
The individual is employed as a welder by the Company in its General Construction Department.
He was given a special assignment to work at Humboldt Bay Power Plant for two weeks in December 15 76.
He l
was given seven hours Radiation Protection Training on December 14 and worked in the radiation area on December 16 and 17, 1976.
Over these l
two days the individual received 3.200 REM to the whole body as indi-cated by his film badge.
l The individual's only work assignment was participation in l
the installation of a new set of regenerative and non-regenerative heat l
axchangers for the reactor cleanup system, which is located at the
-2' l
elevation of the access shaft in the refueling building.
The old heat exchangers are being abandoned in place, and the existing piping is being rerouted to the new units.
The individual did some of the welding necessary to reroute the pipe.
The radiation field in the cletnup heat exchanger room varies from 250 mr/hr to 3500 ar/hr.
All of the werk irl this area is being done while a Radiation Protection Monitor is specifi-cally assigned to monitor the accumulation of personnel expccure anc radiation levels in the work area.
All individuals are wearing three relf-reading pocket dosimeter pencils of different ranges for estimating radiation expecurer at all times, in addition to their fil-badccr.
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Dr. Ernst Volgenau 2
January 21, 1977 The overexposed individual received a total of 2.300 REM esti-ma.ed dose (from the pencil dosimeter) over the two days.
His highest t
range dosimeter pencil (1.0 REM) remained on-scale at all times.
When his dose estimate reached 2.3 REM, he was ordered out of the radiation crea and did not reenter it for the remainder of his special assignment here.
All procedures applicable to the work assignment were correctly followed and there was no indication at that time that the individual's radiation exposure was not within the limits.
Plant experience has been that pocket dosimeter estimates are normally 5 to 10% higher than the film badge results, and that the film badge readings practically never exceed the pocket dosimeter estimate by over 20%.
In order to prevent a recurrence of this situation, two pro-cedures will be established.
The first will contain guidelines for maximum radiation exposure estimates to be received on one film badge which allow for a film badge reading 40% higher than the pocket dosi-meter pencil estimates.
The second procedure will establish a routine calibration for all pocket dosimeter pencils, other than the 0-200 mr range, worn by individuals working in high radiation areas.
Very truly yours,
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Attachments CC w/ attachments:
Mr. R. H. Engelken, Director Office of Inspection and Enforcement Region V l
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l The attached information is submitted as a separate i
part of the report in accorc~.ance with 10 CFR 20.405 (b).
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