ML19241B035
| ML19241B035 | |
| Person / Time | |
|---|---|
| Site: | Oconee  |
| Issue date: | 05/24/1979 |
| From: | Parker W DUKE POWER CO. |
| To: | James O'Reilly NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II) |
| Shared Package | |
| ML19241B033 | List: |
| References | |
| NUDOCS 7907110579 | |
| Download: ML19241B035 (3) | |
Text
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DUKE Powen COMPANY
[
Powen Ucit.DINO 422 SocTn Cucucu STurer, CILAHLoTTr. N. C. 2e242 May 24, 1979 wiwau o,*anca.sa.
T E. E *= C ai t. Am E A 704 Vetr Pat S' CENT 373-4083 St ra s. Paoovctica.
Mr. James P. O'Reilly, Director U. S. Nuclear Regulatory Commission Region II r
101 Marietta Street, Suite 3100
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Atlanta, Georgia 30303
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Re: RII:DMM 50-269/79-8 50-270/79-8 c.n 50-287/79-8 c:e Dear Mr. O'Reilly.
With regard to Mr. J. T. Sutherland's letter of April 30, 1979, which transmitted 50-269/79-8, 50-270/79-8, 50-287/79-8, Duke Power Company IE Inspection Report does not consider the information to be proprietary.
Please find attached responses to the deviation item and the infraction item.
Very truly yours, 7
0./
William O. Parker, Jr.
pgM RLG:ses Attachment 312 244 5
790110'77p 9 JhricLALcop 7
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DUKE POWER COMFANY i
OCONEE NUCLEAR STATION Response to IE Inspection Report 50-269/79-8, 50-270/79-8, 50-287/79-8 INFRACTION Technical Specification 6.4.1 requires the station to be operated and maintained in accordance with approved procedures.
f om March 1978 through March 1979, the Ge (L1) efficiency Contrary to the above, calibrations were obtained using a procedure other than EP/0/B/1003/09, which had been approved.
RESPONSE
The GeLi detectors were calibrated using a new technique because the NBS radio-isotopes necessary for a complete GeLi aetector calibration were not cvailable.
An outside vendor was used to calibrate.. the GeLi detector in the Charlotte En-vironmental Lab and then this detector was used as a standard for the Duke system.
A procedure for system GeLi detector calibration was approved on March 6, 1979.
Sources have been requisitioned so that (1) the new technique for calibration can be verified and (2) procedure HP/0/B/1003/09 - Calibration Procedure for GeLi Detectors on the ND 6620 Multichannel Analyzer -
an be used for calibra-The equipment will be calibrated using HP/0/B/luuj/09 when the new sources tion.
are received. The calibration should be completed by July, 1979.
DEVIATION ANSI Standard N323-1978, Radiation Protection Instrumentation Test and Calibra-tion, Section 4.3.2 states, " Calibration shall be performed with a standard source of sources providing radiation fields similar to those in which the instrument will be used."
Sr source for calibration of a Contrary to the above, the licensee utilized a GM-counterusedforcountgggsmearscontaminatedwithradionuclideshavingmuch lower beta energies than Sr.
This procedure may lead to underestimation of contamination levels.
- RESPONSE, Immediate corrective action consisted of increasing the efficiency factors on all (8-y) by a factor of three until the average beta energies could swipe counters be determined and standards could be prepared for checking the ef ficiency f actors.
Swipe. were taken at several locations in the station to determine the radio-The isotopes found were largely nuclide composition of the contamination present.
which have a weighted average beta energy of approximately Co-58/60 and Cs-134/137 Since this energy is slightly greater than the average beta energy for 0.18 MeV.
New efficiency fac-Cs-134, Cs-134 was chosen to determine the efficiency factors.
tors were determined for all swipe detectors on March 20, 1979.
}))
-2 The swipe counters were all calibrated with a Cs-134 source in a two-inch Periodic swipe checks will be made to determine stainless steel planchet.
if the average beta energy has changed.
312 2A6