ML20197E835
| ML20197E835 | |
| Person / Time | |
|---|---|
| Site: | Crane  |
| Issue date: | 05/06/1986 |
| From: | Travers W Office of Nuclear Reactor Regulation |
| To: | Standerfer F GENERAL PUBLIC UTILITIES CORP. |
| References | |
| CON-NRC-TMI-86-046, CON-NRC-TMI-86-46 NUDOCS 8605150326 | |
| Download: ML20197E835 (2) | |
Text
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DN 50-320 i<1 NRC PDR
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May 6, 1986 TMI HQ r/f
-NRC/THI 86-046 WDTravers MTMasnik RCook i
CCowgill 27 Docket No. 50-320 LChandler ACRS
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Mr. F. R. Standerfer M-town Office 2
Vice President / Director, TMI-2 Service List
'f GPU Nuclear Corporation P. O. Box 480 Middletown, PA 17057
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Dear Mr. Standerfer:
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Subject:
Safety Evaluation Report for the Addition of a Biocide to the THI-2 l
Reference:
Letter 4410-86-L-0078, F. Standerfer to W. Travers, Safety Evaluation Report for the Addition of a Biocide to the THI-2 l }z Reactor Coolant System, dated May 5,1986 l
This letter is in response to the reference which forwarded your safety l
evaluation of the proposed addition of hydrogen peroxide (H 0 ) as a biocide
!O to the reactor coolant system. The purpose of the biocide $r$atment-is to lg disinfect the RCS to aid in the removal,of the biological contamination which is presently causing reduced water clarity and fouling of water processing system filters.
W We have completed our review of your submittal which evaluated the l g*.
compatibility of 200 parts per million (ppm) H 0 with the RCS chemistry and
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the water processing systems, as well as the eff$ cts on criticality, defueling l..
canister catalytic recombinars, and waste disposal.
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We concur with your assessment that the most significant effect expected on
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RCS chemistry is an increase in reactor coolant activity levels. A factor of-10 increase could occur but will not have a significant impact on worker
'~. N safety with the implementation of normal radiological control practices. No 1
significant accelerated corrosion of reactor internal components is expected j ~,
at the proposed concentrations of H,0.
In addition, since the biocide will 2
l be added as a water solution, borated to the RCS technical specification l^4 limit, it will not present a potential for boron dilution or criticality.
l Laboratory testing has shown that H,0 does not cause a permanent degradation of the catalyst material used in the $efueling canisters. No significant reduction in the performance of the zeolite and organic resins used in the water processing systems is expected. Any reduction in the resin's ion l
exchange capacity would require an increase in the frequency of resin j,
replacement but would have no impact on the safety of the systems' operation.
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N?.CFORM 318 (10-80) NRCM 0240 OFFICIAL RECORD ' COPY
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'Mr. F. R. Standerfdr May 6, 1986 7;
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We conclude that the proposed addition of H,0 insufficient quantity to 2
attain a 200 ppm residual in the RCS does nbt pose a significant risk to the health and safety of the public or the occupational work force and does not involve an unreviewed safety question.
We therefore approve your proposed biocide adcition to the RCS contingent upon the submittal of the related procedures subject to Technical Specification 6
6.3.2.
w-Sincerely, ORIGINAL SIGNED BY:
William D. Travers William D. Travers Director THI-2 Cleanup Project Directorate CC:. T. F. Derraitt R. E. Rogan S. Levin U. H. Linton J. J. Byrne A. W. Miller Service Distribution List (seeattached)
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