IR 05000344/1982002
| ML20050D440 | |
| Person / Time | |
|---|---|
| Site: | Trojan File:Portland General Electric icon.png |
| Issue date: | 03/17/1982 |
| From: | Book H, Hamada G, Wenslawski F NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION V) |
| To: | |
| Shared Package | |
| ML20050D436 | List: |
| References | |
| 50-344-82-02, 50-344-82-2, NUDOCS 8204120205 | |
| Download: ML20050D440 (4) | |
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DETAILS 1.
Persons Contacted
- D. Flahardy - Training Soecialist W. Kernion - Chemistry and Radiation Protection
- P. Morton - QA Supervisor
- A. Olmstead - Manager, Technical Services
- J. D. Reid - Manager, Plant Services
- G. Rich - Chemistry Supervisor L. Timme - Chemistry and Radiation Protection
- P. Yundt - General Manager G. Zielinski - Effluent Analyst
- Indicates those present at exit interview.
2.
Quality Control - Calibration of Measurement System, Sampling and Analysis of Reactor Coolant and Effluents Subsequent to the last onsite inspection (Inspection Report 50-344/81-11),
during which independent measurement verification was conducted with the Region V Mobile Laboratory, Trojan determined that its Ge-Li detector needed to be redrif ted.
After redrifting, this system was completely recalibrated with a new set of standards since redrifting is virtually equivalent to obtaining a new detector.
Aware of these developments, Region V made arrangements with NRC's reference laboratory (Radiological and Environmental Science Laboratory -
RESL) to provide Trojan with a test solution containing selected
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gamma emitters, tritium, Sr-89 and Sr-90 for analysis.
This inspection was conducted to assess the adequacy of the recalibra-tions and to review and discuss the results obtained for the test solution.
In addition, procedures for sampling and measuring radioactivity in the reactor coolant (RCS) were also reviewed.
This latter effort was of particular interest at this time because the radiciodine level in the RCS was beginning to approach 60% of the technical specification limit for dose equivalent iodine-131 activity.
The recalibrations appeared to have been done in a technically sound manner; and the Ge-Li detector appears to be operating with improved stability since being redrifted.
The results of the test solution show that Trojan is in agreement with the expected values (see table below), thus attesting to the validity of the recali-brations.
820412O205 820317 PDR ADOCK 05000344 G
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-2-TEST SOLUTION RESULTS Trojan NRC/RESL Ratio Agreement (b)
Nuclide uCi/ml uCi/ml Resolution (a)
Trojan /NRC Range f
H-3 5. 43 E-3 6. 22 + 0. 06 E-3 104 0.87 0. 8 1.25
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Sr-89 1. 05 E-2 7.38 T 0.60 E-3
1.4 0. 6 1.66
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S r-90 6. 38 E-4 5.87 I 0.24 E-4
1.09 0.75 -
1.33 Co-57 9. 60 E-5 9.68 T 0.35 E-5
0.99 0.75 -
1.33 Cr-134 1.27 E-3 1.11 T 0.03 E-3
1.14 0.75 -
1.33 Co-60 2.36 E-3 1.90 T 0.03 E-3
1.24 0. 8 1.25
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Gross B 1. 50 E-2 1.9510.04 E-2
0.77 0.75 -
1.33 CRITERIA FOR COMPARING ANALYTICAL MEASUREf1ENTS Resolution Agreement
0.4 - 2.5 4-7 0.5 - 2.0 8 - 15 0.6 - 1.66 16 - 50 0.75 - 1.33 51 - 200 0.80 - 1.25
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200 0.85'- 1.18
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(a) Resolution - The reference laboratory result divided by its associated one sigma error (b) Agreement - Range within which the ratio of results (licensee /NRC)
should fall l
Currently, the activity in the reactor coolant is such that it is necessary to obtain only a small aliquant of the sample for radio-activity measurement.
A 200 microliter (0.2 ml) aliquant is diluted to 500 ml for counting. This procedure was instituted to minimize pulse pileup and dead time effects resulting from high count rates.
Trojan uses' a 200 microliter Eppendorf micropipette to obtain the sample.
For the volume range 16-500 microliters, the rated absolute error for this pipette is < 0.6% with a coefficient of variation of < 0.3 percent.
Based on this review of sampling procedures and calibration para-meters for the gamma spectrometry system, it may be concluded that measurements of radioactivity in reactor coolant and effluent samples are being conducted with good precision and accuracy.
3.
Exit Interview The exit interview was conducted with Trojan personnel as indicated in paragraph 1.
Management and staff were informed of the satisfac-tory findings of this inspection. Management was also informed of
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a perceived weakness in the ganma spectroscopy system.
Currently, a single disc drive unit operates the system software.
Since the disc drive unit is'one of the weaker links in the ND 6600 gamma spectroscopy system, it would be desirable to have a backup disc drive system.
The licensee agreed and indicated that action had already been initiated to consider acquisition of a backup disc drive unit.
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