ML20235S229
| ML20235S229 | |
| Person / Time | |
|---|---|
| Site: | Crane  |
| Issue date: | 02/16/1989 |
| From: | Ronald Bellamy NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I) |
| To: | Hukill H GENERAL PUBLIC UTILITIES CORP. |
| References | |
| NUDOCS 8903070019 | |
| Download: ML20235S229 (2) | |
See also: IR 05000289/1988030
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= ATTN: Mr. . H. D.f Hukill
.Vice President an'd Director of TMI-1
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-Middletown, Pennsylvania 17057.
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Gentlemen:
. Subject: Reinspection-No. 50-289/88-30
This refers to your letter' dated January.27',:1989, in-response.to our letter--
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Thank y'ou'for informing'us of.the: corrective and preventive ~ actions. documented.
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in'yourfletter; ' These-actions will be' examined during a Lfuture inspection of'
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your' licensed program.
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--In .the second paragraph;of:your letter'you stated that~ the results of yo'ur.
preliminary.~ evaluation 'of . moisture infiltration and decreased sa'mpling system
efficiency has shown revised offsite consequences to be less than 0.05% of-
' Technical . Specification l limits for gaseous- effluents. 'In your final evaluation.
you should~ explain in detail'the bases for this conclusion and all final con -
clusions.
Your' cooperation with'us is appreciated.
Sincerely,
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Ronald R. Bellamy
Ronald'R. Bellamy, Chief
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717 944 7621
TELEX 84 2386
Writer's Direct Olal Number:
January 27, 1989
C311-89-2012
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Mr. William T. Russell
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Region I, Regional Administrator
US Nuclear Regulatory Commission
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475 Allendale Road
King of Prussia, PA 19406
Dear Mr. Russell:
Three Mile Island Nuclear Station, Unit 1 (TMI-1)
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Operating License No. DPR-50
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Docket No. 50-289
Response to Inspection Report 88-30
During NRC Inspection 88-30, conducted November 14-18, 1988, it was identified
that the Continuous Iodine Sampling System for the Condenser Off-Gas System may
not provide a representative sample for iodines being released to the
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environment.
In Inspection Report 88-30, dated December 22, 1988, the NRC
requested that GPUN respond to this concern. This letter provides a
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preliminary response.
Preliminary review of the condenser off-gas effluent charcoal cartridge results
indicate that there is an error in the determination of iodine concentration.
This was concluded by: (1) performing tests on weekly iodine samples subsequent
to November 18, 1988, and (2) determining that moisture has infiltrated the
sampling medium and decreased the system's sampling efficiency. As a result of
item (2), the sample has not been of the expected geometry, therefore,
additional error has been introduced in the counting methodology used. The
effect of the errors in the sampling system is minimal; conservatively,
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preliminary evaluation has shown the revised offsite consequences to be less
than 0.05% of the NRC and TMI-1 Technical Specifications limits for gaseous
effluents.
Upon evaluation of the sampling system, the lack of temperatures above the dew
point throughout the system appears to be the reason that moisture is able to
infiltrate the sample. The present sampling system is heat traced on the
sample line only. The sample holder itself and the down stream sample line are
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not heat traced. This has allowed the sampled air to condense in the sample
holder which is at ambient temperature and thus affect the charcoal filter
sample efficiency. The solution to this problem appears to be to provide an
adequate heat traced system. This would allow the sample to be representative
in that all condenser off gas effluent iodine in the sample would be captured
in the iodine cartridge and be captured in a manner consistent with the current
counting methodology.
GPU Nuclear Corporation is a subsidiary of the General Public Utilities Corporation
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C311-89-2012
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January 27, 1989
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Past condenser off gas sample results will be corrected as necessary based on
evaluation and further testing of the current samp1k; system.
This may
require corrections of effluent data from TMI-1 start-up in October 1985 until
the time samples are representative. We expect to be able to determine the
appropriate corrections by April 30. This will allow ample time to collect
sufficient sample data and establish an appropriate counting system geometry to
determine potential errors.
We will provide the final results of our review of this issue, including any
changes to previously submitted reports, and final corrective actions by
June 30, 1989.
Sincerely,
,
.
. D.
Nil
Vice President & Director, TMI-1
HDH/SM0/spb:2012
cc: NRC Document Control Desk
R. Hernan, NRC
TMI-1 Resident Inspector
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