ML20029A139

Provides Status of Radwaste Room Cleanup Effort,Per 890920 & 900530 Mgt Meetings Re Insp Repts 50-237/89-20 & 50-249/89-19 & 900827 Ltr.Cleanup Effort for Spent Resin Tank Room Completed on 900928 by Utilizing Robot

ML20029A139
Person / Time
Site:	Dresden
Issue date:	01/23/1991
From:	Richter M COMMONWEALTH EDISON CO.
To:	Davis A NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION III)
References
NUDOCS 9102040209
Download: ML20029A139 (2)

Text

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1. gg g, c jhu"sNajth Edison

, C' Downers Grove. stunois 60515 - p_ gput January 23, 1991 %yc- ENZ gH$

.KZ$Z MU::&.b Mr. A. Bert Davis Regional Administrator - Region III U.S. Nuclear Regulatory Commission '9tO.

799 Roosevelt Road Glen Ellyn, Il 60137

Subject:

Dresden Nuclear Power Station Units 2 and 3 Status of Radwaste Room Cleanup Efforts HRCJ9cheLNosm50:23 Land _5.0:ZA9

References:

(a) NRC/ CECO Management Meeting at NRC Region III office (Glen Ellyn, Illinois) on September 20, 1989 (Meeting Report 50-237/89020 and 50-249/89019).

(b) NRC/ CECO Management Meeting at NRC Region III office (Glen Ellyn, Illinois) on May 30, 1990.

(c) M. Richter (CECO) letter to A.B. Davis (NRC), dated August 27, 1990.

Dear Mr. Davis:

During a meeting with your staff on September 20, 1989 (Reference (a)1, Commonwealth Edison Company (CECO) discussed the conditions of the Spent Rasin Tank Room and Sludge Tank Room in the Dresden Station Unit 2/3 Radvaste Building. Additionally, in a meeting with your staff on May 30, 1990 (Reference (b)), CECO reported that a further review of limited access araas in the Radwaste Building identified two (2) new locations (Haste Concentrator Vaults and Main Concentrated Haste Tank Vault) for potential cleanup efforts.

. Reference.(c) provided:a status of the cleanup efforts for the tank rooms, and indicated that the vault locations would be evaluated for potential cleanup efforts. This-letter provides an update on those items.

The cleanup effort for the Spent Resin Tank Room floor was completed on September 28, 1990. A robot was utilized to assist with this cleanup effort in order to minimize personnel exposure during the process.

7 Upon. completion of the Spent Resin Tank Room, efforts were directed h to the cleanup of the Sludge Tank Room. As indicated in Reference (c), a-onca sparging technique was previously utilized and found to be ineffective in

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-oo removing the sludge from the floor. The robot which proved effective in the cleaning of.the Spent Resin Tank Room has been utilized for the Sludge Tank E$ Room; however, operational difficultles were encountered. The robot u manufacturer has been consulted to assist with enhancements to improve the ou effectiveness and reliability of the robot. CECO believes the robot can be .

$3 utilized to effectively clean the Sludge Tanic Room, and efforts will continue pt using-this technique. At this time, it is estimated that the cleanup of the gg Sludge-lank Room is approximately ten percent (107.) complete. m

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-Mr. A.B'.. Davis- January 23, 1991 It should also be noted that in addition to-the cleanup of the Sludge Tank Room,-Dresden Station will be expending resources on other radwaste.

cleanup efforts. While these other projects may have some impact on the Sludge Tank Room cleanup effort, CECO is currently assessing the resources i required to ensure that the approptlate attention is given to each project.

Contingent upon effective operation of the robotics being employed, it is expected that the cleanup efforts for the Sludge Tank Room will be completed by June 30,.1991.

The evaluation for potential cleanup efforts of the Haste Concentrator Vaults and the-Main Concentrated Haste Tank-Vault has not been

. completed at this time. It is expected _that the evaluation will be completed by March 31, 1991 A.t that-time, C6Co will notify you of the plans for those vaults.

Although the Sludge Tank Room cleanup effort is taking longer than originally expected, the limited. material quantitles as well as the facility _

_ design provides assurance that there is no adv&rse impact on safe plant operation or the environs. Additionally, access to the Sludge Tank Room (and vaults)-is restricted to prevent inadvertent entry. For this cleanup effort, CECO wlll continue to utilize -techniques which will minimize personnel exposure.

Please contact this office should further information be required.

Respectfully, Mb f .

H.H. Richter Nuclear Licensing Administrator

-cc: NRR Document Control Desk

.B. Siegel - NRR Project Manager D. Hills --Senior Resident Inspector, Dresden L. Greger - EPRP Branch Chief, Region III i-MR:lmw I mxwmo

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