ML20202H265
| ML20202H265 | |
| Person / Time | |
|---|---|
| Site: | Crane  |
| Issue date: | 07/09/1986 |
| From: | Travers W Office of Nuclear Reactor Regulation |
| To: | Standerfer F GENERAL PUBLIC UTILITIES CORP. |
| References | |
| CON-NRC-TMI-86-066, CON-NRC-TMI-86-66 NUDOCS 8607160250 | |
| Download: ML20202H265 (2) | |
Text
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DISTRIBUTION:
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DN 50-320 TMI Site r/f TMI HQ r/f
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l July 9, 1986 DCS HRC/THI 86-066 WDTravers t
MTMasnik JRWhite l
CCowgill Docket No. 50-320 LChandler I&E ACRS lir. F..R. Standerfer M-town Office
~Vice President / Director, THI-2 Service List GPU Nuclear Corporation P. O. Box 480 Hiddletown, PA 17057 l
l
Dear Mr. Standerfer:
Subject:
Safety Evaluation for the Operation of the Filter-Aid Feed System and Use of Diatomaceous Earth as Feed Material
References:
(a) Letter 4410-86-L-0104, F. Standerfer to W. Travers,
'74 Safety Evaluation for the Operation of the Filter Aid Feed System and Use of Diatomaceous Earth as Feed Haterial, dated June 30, 1986 (b) Letter NRC/TMI 85-055, W. Travers to F. Standerfer, Defueling Water Cleanup System, dated August 6,1985 (c) Letter NRC/TMI 85-083. W. Travers to F. Standerfer, Defueling Canister Technical Evaluation Report, dated November 5, 1985 Reference (a) was your submittal of a safety evaluation for proposed modifications to the Defueling Water Cleanup System (DWCS) that would allow precoating of the DWCS filters and injection of-a filter aid material to the DWCS process stream. The addition of diatomaceous earth (DE) as a l
precoat/ filter aid is intended to improve DWCS filter >erfonnance by preventing fouling of the sintered metal filter media
)y colloidal suspensions of silicon and iron oxides. The presence of these colloidal' suspensions is 4
believed to be the cause of the premature plugging of the filters encountered i
during early system operation.
We have reviewed your submittal and evaluated the system as described for the l1' impact on the DWCS and defueling canister technical evaluations approved by lh the staff in references (b) and (c).. We have determined that the addition of
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l DE, which is composed of primarily 510, to the filter canisters will not adversely affect the operation of the $atalytic recombiners nor will it have
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any affect on the predicted radiolytic gas generation rate in a closed canister. The addition of the material will not affect the bounding iN conditions of the canister criticality analysis discussed in reference (c) and proper administral.1ve controls to assure that the body feed /precoat material is prepared with borated water will insure that operations remain within the bounds of the criticality evaluation in reference (b). The equipment modifications necessary for the addition of body feed /precoat material do not J: '
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- Mr. F. R. Standerfer July 9, 1985
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i present the potential for any releases of radioactive material not previously l
analyzed in references (b)-and (c).
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We have concluded that the proposed filter aid addition program can be safely implenented without any undue risk to the health and safety of the public or the occupational work force. We, therefore, approve your proposed program contingent upon the submittal of the associated procedures subject to technical specification 6.8.2.
r Sincerely, i
ORIGINAL SIGNEp BY VWiliam D. Inwen William D. Travers, Director TMI-2 Cleanup Project Directorate cc:
T. F. Demmitt R. E. Rogan S. Levin W. H. Linton J. J. Byrne A. W. Hiller j
Service Distribution List (see attached) i i
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