ML20148L912

Forwards Results of Measurements of Radioactive Matl in NRC Phantom on Whole Body Counter.Encl 1 Contains Actual Amount of Each Radionuclide Present,Encl 2 Gives Ratio of Measurements to DOE Values & Encl 3 Gives Recommendations

ML20148L912
Person / Time
Site:	Hatch
Issue date:	11/09/1978
From:	Sutherland J NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II)
To:	John Miller GEORGIA POWER CO.
References
NUDOCS 7811200409
Download: ML20148L912 (5)

Text

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$ 101 M ARIETTA sTREE T, N.W. O>j 'e o f ATL ANT A. G E ORGI A 30303 gv f liDV 3 91978 In Reply Refer To:

RII.' C 50-321/78-25 50-366/78-34 Georgia Power Company Attn: Mr . J .11. Mille r , J r.

Executive Vice ersic'ent 2i0 Peachtree Street, iJ.k Atlanta, e orgia  ;, "

Gent 1eme ,:

This refers to the inspection conducted by Mr. k'. J. Millsap of this office on July 21, 1978, of activities authorized by NRC Operating License Nos.

DPR-57 and NPF-5 for the E. I. llatch 1 and 2 facilities. The results of this inspection are discussed in our Inspection Report Nos. 50-321/78-25 and 50-366/78-34 which was enclosed with our letter to you dated August 22,

'978.

During the inspection, members of your staff measured the amount of radioactive material in an NRC phantom on the whole body counter. This measurement was also maA by other NRC licensees and three Department of Energy laboratories. The result of these measurements are given in the enclosures to this letter.

Enclosure 1 gives the results of the measurements made by your staf f, the actual amount of each radionuclide present in the phantom at the time of this measurerent, 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 c.ade by DOE laboratories and NRC licensees. Power reactor f acility values are denoted by single letters; Department of Energy laboratory values are denoted by double letters. Enclosure 3 discusses general recommendations based on the inspector's observations of these measurements.

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Georgia Power Company 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, s.s i ? -

i J.A/*

T. SutherIand, MtM4[NN. '

e Fuel Facility and Materials Safety Branch

Enclosures:

As stated cc w/ encl:

Mr. C. E. Belflower Site QA Sanervisor Plant E. .. Hatch P.O. Box 442 Baxley, Georgia 31513 Mr. M. Manry, Plant Manager Plant E. I. Hatch P.O. Box 442 Baxley, Georgia 31513 Mr. Ross Rogers Resident Inspector Plant 1. E. Hatch P.O. Box 442 Baxley, Georgia 31513

Enclosure 1 Facility: Hatch Facility Designation: F Date of Measurement: July 21, 1978 Measurement Ratio Result Actual (Measured / Actual)

a. Co-60 0.30 pCi 0.24 pCi 1.25

b. Cs-137 0.11 pCi 0.13 pCi 0.85 .

c. Co-57 0.62 pCi 0.51 pCi 1.22

d. Cs-134 Not Reported 0.57 nCi

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k Enclosure 2 Ratios (fleasured/ Actual)

Fr.cility Co-60 Cs-137 Co-57 Cs-134**

1 A* 1.29 1.62 0.07 NR

2. B 1.08 1.92 1.22 NR

3. C 1.42 1.31 0.66 NR

4. D 1.46 0.85 hW 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 .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 f

Facility A reported Cr-51 present in the amount of 0.10 pCi. This was not present in the phantom.

• • NR - Not Reported.

i Enclosure 3 Observations by the inspector during the course of all phantom measurement 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 pre-determined 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 ideatifying the Co-57 once the presence of a low energy emitter was reengnized because of the unexpected response of the detectors at low energies.

3. Each licensee should consider some sort of intercomparison or inde-pendent standard test of his whale body counter (s). A test of this na ture might reveal problems n c immediately apparent to an individual group working independently of all others.

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