ML20138L745

Special Rept:Discusses Circumstances Which Led to Inaccuracies in Personnel Cumulative Lifetime Dose Records. Cumulative Permanent Doses in Radiation Dosimetry Rept Do Not Agree W/Records Maintained in Computer File

ML20138L745
Person / Time
Site:	La Crosse File:Dairyland Power Cooperative icon.png
Issue date:	10/08/1985
From:	Taylor J DAIRYLAND POWER COOPERATIVE
To:	James Keppler NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION III)
References
LAC-11186, NUDOCS 8510310396
Download: ML20138L745 (3)

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btn6 D DA/RYLAND h [k COOPERAT/VE PO BOX 817 2615 EAST AV SOUTH LA CROSSE WISCONSIN 64601 (608) 788-4000 October 8, 1985 In reply, please refer to LAC-Ill86 DOCKET No. 50-409 FRIO9fiY PluilllG

[ h Mr. James G.Keppler Regional Administrator [im- irb i

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U. S. Nuclear Regulatory Commission _

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Directorate of Regulatory Operations ab Region III FILE T &

799 Roosevelt Road Glen Ellyn, IL 60137

SUBJECT:

DAIRYLAND POWER COOPERATIVE LA CROSSE BOILING WATER REACTOR (LACBWR)

PROVISIONAL OPERATING LICENSE NO. DPR-45 SPECIAL REPORT

Dear Mr. Keppler:

The purpose of this spe;ial report is to inform you of circumstances which led to inaccuracies in personnel cumulative lifetime dose records at LACBWR. The cumulative permanent doses reported on the Radiation Dosimetry Report provided to us by our contractor, R. S. Landauer Jr. and Company, are not in agreement with the cumulative permanent dose records maintained in our computer file. This was especially true in the case of our maintenance department personnel lifetime doses, since about February, 1984.

In October, 1982, Dairyland Power Cooperative (DPC) changed primary personnel dosimetry contractors. At that time, DPC established a dosimetry program with R. S. Landauer Jr. and Company. We sent them a list of personnel, social security numbers, and other pertinent data, including each person's permanent annual and lifetime dose record to that date. The initial dosimetry program with R. S. Landauer was a whole body film and TLD issued to each person, and assessed for dose on a monthly basis. Landauer assigned all previous lifetime dose, to the film badge values and not to the TLDs.

Subsequent Landauer reports totalled film dose, and TLD dose separately.

When a monthly Landauer report was received by LACBWR, the higher of the TLD or film dose was assigned to the permanent dose record maintained in our computer based dosimetry records. In this regard, computer based permanent dosimetry records include a mixture of TLD and film doses, whereas the Landauer report permanent dosimetry records are strictly film dose summations plus previous dose supplied by DPC in October, 1982, for most personnel.

8510310396 851000 PDR ADOCK 05000409 l S PDR 001  ;

PCI-10 1 e l OCT211985

• O Mr. James G. Keppler October 8, 1985 Regional Administrator LAC-lll86 1

4 Neutron dose equivalent assignment portions of whole body dose records, are J

supplied by DPC to Landauer, and do not in themselves affect permanent dosimetry record differences.

In September 1983, a trial program was implemented which involved assessing the recorded dose for maintenance personnel twice a month, to enable closer monitoring of their accumulated dose. A second set of dosimetry was worn, assessed monthly as before, to be used for the official records. A different identification code was assigned to the bi-monthly dosimetry for record keeping purposes. In February 1984, it was decided a bi-monthly evaluation of maintenance personnel permanent dosimetry was worthwhile, so maintenance department permanent dosimetry assessment was changed officially to strictly bi-monthly. The same bi-monthly dosimetry identification code as had been used during the trial period was retained.

The permanent cumulative dose recorded for personnel under that identification code was only that which was received on the trial bi-monthly dosimetry worn between September 1983 and February 1984. The lifetime doses which were recorded under the monthly identification code for the period October 1982 to September 1983, plus DPC supplied permanent dose records prior to October 1982, were dropped from the Landauer Radiation Dosimetry Report. LPC had not specified nor thought it necessary to specify, that the previous maintenance personnel's doses be added to the cumulative dose indicated on the Landauer reports, since all doses were entered into our computer program which maintains permanent cumulative lifetime doses.

However, Landauer's quality control procedures or computerized dose report program should have identified and corrected the lifetime cumulative dose data by an alternate parameter other than ID code, such as name or social security number. The lifetime cumulative doses for approximately 12 maintenance department personnel were affected in this case.

Personnel doses are continuing to be maintained on an inhouse computer program. They were recently corrected by re-entering data, as necessary.

Only the current period's doses are entered into the computer. A program calculates cumulative doses. Dairyland power Cooperative has formally asked R. S. Landauer to no longer report lifetime cumulative doses, so that the potential for reoccurrence of a similar problem will be eliminated.

4 There were no personnel doses in excess of the permissible limits specified by 10 CFR 20.101(b) as a result of the identified discrepancies.

No dose information was lost, so records could be reconstructed to meet the

! requirements of 10 CFR 20.401(a) and (c).

This problem was observed by your Inspector, Mr. D. E. Miller, on a recent routine cafety inspection, after being previously detected by DPC management personnel. The NRC Resident Inspector requested that DPC also submit a report covering the circumstances.

l i PCl-10 2

Mr. James G. Keppler October 8, 1985 Regional Administrator LAC-lll86 If you have any questions, please contact us.

Very truly yours, DAIRYLAND POWER COOPERATIVE V

James W. Taylor General Manager JWT: LSG: PWS: sks cc: Document Control Desk U.S. Nuclear Regulatory Commission Washington, DC 20555 NRC Resident Inspector PCl-10 3 l