IR 05000312/1981018
| ML20009D546 | |
| Person / Time | |
|---|---|
| Site: | Rancho Seco |
| Issue date: | 07/14/1981 |
| From: | Book H, Hamada G, Wenslawski F NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION IV) |
| To: | |
| Shared Package | |
| ML20009D544 | List: |
| References | |
| 50-312-81-18, NUDOCS 8107240158 | |
| Download: ML20009D546 (2) | |
Text
_.
_
.
.
,:
U. S. NUCLEAR REGUL\\ TORY COMMISSION OFFICE OF INSPECTION AND ENFORCEME!TI b
REGION V
u::_,
'
Repo rt No. Gn 117/R1 1R Docket No.
50-312 DPR-54 ttcense go, Safeguards Group Licensee:
Sacramento Municipal Utility District 1708 59th Street Rnv 1_ RR1 A Sacramento, California 95813 Facility Name: Rancho Seco Inspection at: In Office Inspection conducted:
June 30, 1981 Inspectors:
Y Y/
' t rufW (), 7 t), j9[}
G. Hamada, Radiation Laboratory Specialist (/
Ygte Sig'ned Date Signed Date Signed em Approved by:
/ft.
Q fyjpp/
F. Wenslawski, hi'ef, Reac or Radiation Protection (/
(JDatc/ Signed h M / /, f 9 I[
Approved by-
-
. H. E. Book, Chief, hadiological Safety Branch V
Orate Signed
'
Summary:
Inspection of June 30, 1981 (Report No. 50-312/81-18)
This report is a followup to Report No. 50-312/81-11 in which an open item was identified.
Elements relating to the open item are discussed here, and on the basis of the results obtained, the open item is closed.
,q h RV Form 219 (2)
8107240158 810720 PDRADOCK05000g C
- - - -
-
-
.
c
<
..
..
..
DETAILS
1.
Background During the inspection of March 16-20, 1981 (Inspection Report No. 50-206/81-11) for independent measurements verification, a liquid effluent sample was obtained for split analyses between Rancho Seco and the NRC Contractor Laboratory (Radiological and Environmental Sciences Laboratory (RESL) o" the Department of Energy}. The intercomparison
. measurements included analysis for Tritium (H ), Gross Beta, SR-89 and SR-90. The analyses have been completed and the results are discussed below.
'
2.
Discussion of Results
.
The table below indicates agreement for tritium and possible agreement for the other analyses.
RANCHO RESL RATIO AGREEMENT POSSIBLE ANALYSIS jACi/ml p.Ci/ml RANCH 0/RESL-RANGE AGREEMENT H-3-
_(1.81 1 0.01) E.-1 (1.56 1.0.01) E-1 1.16 0.80-1.25 0.75-1.33 SR-89-(3.80 1 0.50) E-5 (7.7 1 0.5) E-5 0.49 0.6 -1.66
.4 -2.5 SR-90 (1.52 1 0.33) E-5 (0.9 1 0.1) E-5 1. 7 0.6 -1.66
.4 -2.5 Gross B (2.96 1 0.01) E-2* (1.80 10.07) E-2** 1.64 0.75-1.33
.5 -2.0 Analyzed on 4/9/81,0900
. Kev). Because of the significant difference in their average beta energies, the efficiencies would also be different. Measurements using Cc-60 calibration woulo tend to be high as compared to the same measurements periormed with Cs-137 calibration.
In the above table, the gross beta results are in the direction expected.
Rancho Seco personnel was informed of this potential discrepancy during the inspection of March
.16-20, 1981. They agreed that this situation should be corrected, and more recent comunication with Ranch'; indicated that a Cs-137 standard has been ordered and a new calibration for gross beta with-Cs-137 should be completed in the near future.
While total agreement was not achieved, none of the intercomparison rasults was rejected because of "no agreement". They all fell at least within the category of "possible agreement".
On the basis of this qualified agreement, the open item (item no. 81-11-01) identified in report no. 50-312/81-11 is closed.
It is expected, however, that necessary steps will be taken to further improve the analytical procedures such that better agreement may be achieved in the future.
-
-
~