ML20206P743
| ML20206P743 | |
| Person / Time | |
|---|---|
| Site: | Zion File:ZionSolutions icon.png |
| Issue date: | 04/02/1987 |
| From: | Pliml G COMMONWEALTH EDISON CO. |
| To: | Shafer W NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION III) |
| References | |
| NUDOCS 8704210259 | |
| Download: ML20206P743 (6) | |
Text
'.
Commonwrith E " son Zi;n G:n:r: ting Strtlon 101 Shiloh Blvd.
Zion, Illinois 60099 Telephone 312/746-2084 April 2, 1987 U.S.
Nuclear Regulatory Commission Attn:
Mr.
W.D.
Shafer, Chief Emergency Preparedness and Radiological Protection Branch 799 Roosevelt Road Glen Ellyn, Illinois 60137 Mr. Shafer:
This refers to the routine safety inspection conducted by A.G.
Januska of your office on July 21-25, 1986 at Zion Station.
Inspections Reports 50-295/86018 and 50-304/86017.
At the time of the inspection exit meeting several items remained open pending further action by the station.
Attached is the station's response to those items which was completed in October 1986.
However, it appears that your office may not have received a copy.
We apologize for any inconvenience this ma have caused.
/'
g' G. f. Plimi St9 tion Manager GJP/CS/gn ec:
C.
Schultz P.
Zwilling Master File b
M> (~l 070421ggj9$[800$95 FDH A
g APR 101987, PDR o
e, October 24, 1986 OSR/069/86 To: G. J. Plimi
Subject:
On-Site (OSR/069/86) Review of Responses to Open Items identified in NRC Inspection Reports 50-295/86018 and 50-304/86017.
NRC Inspection Reports 50-295/86-86018 and 50-304/86017 requested responses to several open items.
The following responses satisfy this requirement and provide information on the status of the remaining open items and includes the analysis results of this Third Quarter 1986 Confirmatory Measurements Program.
NM
'r Disciplines required:
A.B.E.F Prepared by: Patrick M. Zwilling F L Station Review:
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/<. lech' $taf f Supervisor
~Dperating Engineer Asst'. Superintendent AGtG j{ bc.gG g / J.
t I concur and approve:
v
- v1 G. J. Plimi j
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Station Manager l
lion Station 4
Attachments cc: R. N. Cascarano C. J. Schultz /PNSRC 4
M. L. Carnahan P. M. Zwilling D. P. Galle _
F. G. Lentine R. J. Squires J. P. Leider/W. Benjamin
,P. C. LeBlond W. J. Shewski Master File 4
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Octcber 24, 1986
'l OSR/069/86 Response to Open item 295/86018-01:
304/86017-01 The co-60 efficiency calculations for the 1 liter geometry were evaluated for accuracy, Zion Station personnel evaluated the calculations by comparing the source certificate documentation with the actual analysis.
No ir. consistency in the results were discovered.
An independent evaluation was completed by the Technical Services, Radiochemistry
(
Services Group.
Refer to the enclosed report, C. Douglas Cole, Radiochemistry Services, letter to P. M. Zwilling, Zion Lead Chemist, GDC-86-012, for the response to this open item.
The second part of this open item has been completed.
The first set of analyses, of the spiked liquid sample supplied by the NRC, indicated i
inconsistency between the detectors. This apparently was contributed to the low Co-60 concentration in the spike : ample and detector background contamination. The second set of analyses were performed with a higher level of Co-60 concentration and the Co-60 background counts were manually subtracted out. The result, 7.3E-5 microcurie /ml, is an average activity determined between the detectors Response to Open Item 295/86018-02: 304/86017-2 Refer to the enclosed Sample Record Sheet for gross beta, H-3, Sr-89 and Sr-90 results.
Response to Open Item 295/86018-03: 304/06017-3 Refer to the enclosed report, C. Douglas Cole, Radiochemistry Services, letter to P.M. Zwilling, Zion t.ead Chemist, GDC-86-012, for the response to this open item.
Response to Open item 295/86018-04: 304/86017-4 The gas geometries recalibrations were completed as of August 13, 1986.
ResDonse to Open item 295/86018-05: 304/86017-05 ZCP 530-13, Daily Performance Check of the Packard Liquid Scintillhtion Counters and ZCP 531-7, Perf ormance Test f or the Eberline Model SAC-4 Scintillation Alpha Counters were in review by mid August. ICP 401, Tables 76 and 81 were also reviewed at that cime and their current revision are effective as of October 15, 1986.
Regarding the comment concerning a cross-check program with an outside vendor, Zion Station will start in November, 1986 participating in Analytics, Inc. blind standard program.
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60C-86-012 Date:
170CT86 i
To:
P. M. Zwilling Lead Chemist ZION Rad / Chem
Subject:
Open Items from Nuclear Regulatory Commission's (NRC)
Confirmatory Neasurements Program Inspection during JUL86 25JUL86 at Zion The subject inspection took place on 21 Nuclear Generating Station.
Three open items resulted from the confirmatory measurements sample split conducted at the request of the NRC inspector (A.
G.
Januska).
The Radiochemistry Services group of the Chemistry and Radwaste Services section was requested to provide an independent review of the actions and responses of ZION Chemistry to the open items (see the attached document, Inspection Report numbers 50-295/86018 and 50-304/86017).
Our review follows:
Conservative disagreements for cobalt-60 measured on two of ZION's detectors versus NRC (0 pen Item -01):
Initial dif f erences between ZION and NRC are significant; spike analyses called for in the attachment are ongoing; review of calibration information and reports turned up no apparent problems; adjusting for counting room background provided closer agreement for one of the detector's vs. NRC; results f rom other detector are still under investigation.
Disagreements for-iodine-131 measured on two of ZION's detectors versus NRC (0 pen Item -03):
Receiving one " disagreement" and one " agreement" when the ZION results are actually in good precision inappropriately focuses attention on I-131; such distinctions are simply not justifiable given the error in all the numbers being compared (including NRC's); recalibration is not called for based on the I-13), or any of the other radionuclidic, comparative results; review of the
" local" calibration reports turned up no apparent problems.
Notwithstanding, calibration methodology is a
salient factor; the use of aging calibration sources, whether with respect to the half-lives of constituent radionuclides or 9
- ~ - -
Page 2 GCD-86-012 the manufacturer's certified expiration date, will affect sample
- results, especially in the aspect of counting uncertainties; comon industry practice reflects a
preference for newer rather than older calibration sources to maintain the best possible quality assurance.
Also, it may be productive to confirm that the sample was handled the same way by ZION and NRC; this sample type may not reflect the front-to-back loading of the calibration standard; any accommodation of this ef fect must be uniform between ZION and NRC.
Conservative disagreement for a
sample and resample of xenon-133; one ZION detector versus NR.C (0 pen Item -04):
Problems of technique associated with dispensing aliquots of gas calibration standard are acknowledged as producing the specific (Xe-133) and sample biases; calibration with the new gas standard, presumably with improved technique of the analyst, yielded results in closer precision to NRC's.
In our view, only Open Item -01 remains unresolved.
Outside the realm of open items, either resolved or unresolved, is the continued excellent performance of ZION Chemistry with respect to the NRC's Confirmatory Measurements Program.
We are Please pleased to be able to enhance an already good program.
address any relevant questions to G. D. Cole, extension 5552 at the Technical Center.
Respectfully.
\\
Q vg G. Douglas Cole Group Leader Radiochemistry Services Approved:
Am.s NkaM J
S. R. HopeweT1
/
Chemistry Services Supervisor Nuclear Services Technical GOC /1mr Attachment cc: A. J. Kennedy J. F. Jirka C. M. 0011 R. R. Luczak 02 Sin