ML20199D444

Comments on Proposed Mods to Defueling Water Cleanup Sys Per Revised Technical Evaluation Rept.Revs Do Not Alter 850806 Conclusions,Provided Stated Administrative Controls Implemented While Sys Operating in Bypass Mode

ML20199D444
Person / Time
Site:	Crane
Issue date:	03/17/1986
From:	Travers W NRC
To:	Standerfer F GENERAL PUBLIC UTILITIES CORP.
References
CON-NRC-TMI-86-024, CON-NRC-TMI-86-24 NUDOCS 8603240104
Download: ML20199D444 (3)

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DISTRIBUTION:

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Docket No. 50-320

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.NRC PDR i

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TMI HQ r/f TMI Site r/f.

~W March 17, 1986 WDTRavers q.

NRC/TMI-86-024 MTMasnik

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RHall Docket No. 50-320 Acting Chief, Tech Support

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Mr. F. R. Standerfer JThomas

-M Vice President / Director LChandler, ELD Three Mile Island Unit 2 IE m

GPU 3sclear Corporation ACRS P.: 0. Box 480 M-Town Office sq;}

Middletown, PA 17057 F

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Dear Mr. Standerfer:

f' Sub, Ject: Defueling Water Cleanup System Technical Evaluation Report

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References:

(a) Letter 4410-85-L-0192, F. Standerfer to B. Snyder, Defueling C'

Water Cleanup System Technical Evaluation Report, dated C

September 27, 1985 l

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(b) Letter 4410-86-L-0011, F. Standerfer to W. Travers, w

Defueling Water Cleanup System Technical Evaluation Report,

'.4 dated February 7,1986 (c) Letter. NRC/THI-85-055 W. Travers to F. Standerfer,

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Defueling Water Cleanup System, dated August 6,1985 References (a) and (b) forwarded for NRC staff approval, revisions to the Defueling Water Cleanup System (DWCS) Technical Evaluation Report (TER), and r

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.the corresponding revisions to the associated System Descriptions (50). The F

NRC staff safety evaluation and approval of the previous TER are documented in reference (c).

3 The revisions include minor wording changes for clarification, discussion of N'

system modifications to connect to the defueling canister dewatering system, 9

modifications to connect to the canister decontamination system. modifications

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y that replace the suction hoses on the reactor vessel filtration pumps with 6,

hard pipe, and-installation of a main filter canister bypass capability.

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We have completed our review of the proposed modifications discussed in the A1 revised TER. -We have determined that the revisions do not alter our previous E

conclusions discussed in reference (c) provided the additional administrative controls discussed below are implemented when operating the DWCS in a mode i

which bypasses the main filter canisters.

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The original system design included post filters in the process stream going

'i to the ion exchangers. The post filters served as an additional barrier to prevent fuel fines from reaching the ion exchange media in the event of filter b603240104 860317 or= >

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L Mr. F. R. Standerfer March 17, 1986

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break-through in the main filter canisters. Your proposed operating mode which bypasses the main filter canisters would result in the post filters being the only barrier to fuel transport to the ion exchangers. Although this does not present a significant criticality concern due to the presence of borated water, it does present a concern for future disposal of the ion exchange media because of the potential for contamination with transuranic (TRU) material in either excessive or unknown concentrations. We agree with.

your assessment that the probability of fuel transport to the ion exchangers due to post filter failure is reduced by your proposal to reduce the allowable i

differential pressure across the post filters during main filter bypass i

operation. However, we believe additional controls are necessary and have I

discussed this issue with members of your staff. Pursuant to the discussions between our respective staffs, we approve the modifications described in the revised DWCS TER through revision number 9, and we approve operation of the s

system in a mode bypassing the main filter canisters provided the following procedural controls are implemented:

(1) The preferred mode of operation when bypassing the main filter canisters i

will be to return the post filter effluent directly to its source, or to

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process through the Submerged Domineralizer System rather than processing through the DUCS ion exchangers.

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-(2)

If it is necessary to process the post filter effluent through the DWCS-ion exchangers, it will be done under the control of a process control plan with adequate provisions to accurately assess the quantity of TRU material deposited on the ion exchange media.

Operation of the system will be contingent upon your submittal of the applicable procedures subject to an approval per Technical Specification 6.8.2.

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Sincerely, o mlo e4AE 5 8 8 E wusem D. Dumas l

William D. Travers Director T!11-2 Cleanup Project Directorate 1

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