ML15223A283
| ML15223A283 | |
| Person / Time | |
|---|---|
| Site: | Oconee  |
| Issue date: | 11/09/1978 |
| From: | Sutherland J NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II) |
| To: | Parker W DUKE POWER CO. |
| References | |
| NUDOCS 7811200421 | |
| Download: ML15223A283 (5) | |
Text
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UNITED STATES 0,oC NUCLEAR REGULATORY COMMISSION W
REGION II 101 MARIETTA STREET, N.W.
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ATLANTA, GEORGIA 30303 8
e NOY OS 1978 In Reply Refer To:
RII:WJM 50-269/78-17 50-270/78-17 50-287/78-18 Duke Power Company Attn:
Mr. William 0. Parker, Jr.
Vice President, Steam Production P. 0. Box 2178 422 South Church Street Charlotte, North Carolina 28242 Gentlemen:
This refers to the inspection conducted by Mr. W. J. Millsap of this office on August 7,
- 1978, of activities authorized by NRC Operating License Nos. DPR-38, DPR-47 and DPR-55 for the Oconee Nuclear Station 1, 2 and 3 facilities. The results of this inspection are discussed in our Inspection Report Nos. 50-269/78-17, 50-270/78-17 and 50-287/78-18 which was enclosed with our letter to you dated September 20, 1978.
During the inspection members of your Oconee staff measured the amount of radioactive material in an NRC phantom on the whole body counter.
This measurement was also made by other NRC licensees and three Department of Energy laboratories. The results of these measurements are given in the enclosures to this letter. gives the results of the measurements made by your staff, the actual amount of each radionuclide present in the phantom at the time of this measurement, and the ratio of measured'to actual amounts. Enclosure 2 gives the ratio of each measurement result to the amount actually present in the phantom at the time of the measurement for all measurements made by DOE laboratories and NRC licensees.
Power reactor facility values are denoted by single letters; Department of Energy laboratory values are denoted by double letters. discusses general recommendations based on the inspector's observations of these measurements.
Amoom
Duke Power Company
-2 Should you have any questions concerning this letter, we will be glad to discuss them with you.
No reply to this letter is required.
Sincerely, J. T. Sutherland, Chief Fuel Facility and Materials Safety Branch
Enclosure:
As stated cc w/encl:
Mr. J. E. Smith, Station Manager Oconee Nuclear Plant P. 0. Box 1175 Seneca, South Carolina 29678
Enclosure I Facility:
Oconee Nuclear Station Facility Designation:
G Date of Measurement:
August 7, 1978 Measurement Ratio Result Actual (Measured/Actual)
- a.
Co-60 0.34pCi 0.24pCi 1.42
- b.
Cs-137 0.21pCi 0.13pCi 1.62
- c.
Co-57 0.64pCi 0.48pCi 1.33
- d.
Cs-134 Not Reported 0.56nCi Ratios (Measured/Actual)
Facility Co-60 Cs-137 Co-57 Cs-134
- 1.
A*
1.29 1.62 0.07 NR O
- 2.
B 1.08 1.92 1.22 NR
- 3.
C 1.42 1.31 0.66 NR
- 4.
D 1.46 0.85 NR" NR
- 5.
E 2.04 2.77 NR NR
- 6.
F 1.25 0.85 1.22 NR
- 7.
G 1.42 1.62 1.33 NR
- 8.
H 0.88 1.62 0.63 43
- 9.
I 1.63 2.38 0.23 NR
- 10.
J 2.42 2.62 NR NR
- 11.
AA 1.36 1.38 2.97 NR
- 12.
BB 0.78 0.92 0.67 NR
- 13.
CC 1.13 1.38 1.00 NR Facility A reported Cr-51 present in the amount of 0.10 pCi.
This was not present in the phantom.
NR - Not Reported.
Observations by the inspector during the course of all phantom measurements suggest three general recommendations for the improvement of the whole body counting programs.
- 1. The spectrum resulting from each whole body count should be observed in its entirety in order that the presence of unexpected radionuclides will be recognized. Several licensees failed to recognize the presence of the Co-57 apparently because its gamma energy falls outside a predetermined region of interest.
- 2.
Each licensee should determine the energy response (energy/channel) of his detector over the full range of the spectrum.
Several licensees had difficulty identifying the Co-57 once the presence of a low energy emitter was recognized because of the unexpected response of the detectors at low energies.
- 3.
Each licensee should consider some sort of intercomparison or independent standard test of his whole body counter(s).
A test of this nature might reveal problems not immediately apparent to an individual group working independently of all others.