ML20135E482
| ML20135E482 | |
| Person / Time | |
|---|---|
| Site: | 07000036 |
| Issue date: | 11/21/1996 |
| From: | Sharkey R ABB COMBUSTION ENGINEERING NUCLEAR FUEL (FORMERLY, ASEA BROWN BOVERI, INC. |
| To: | Shear G NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION III) |
| References | |
| NUDOCS 9612110308 | |
| Download: ML20135E482 (4) | |
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g November 21,1996 Gary L. Shear, Chief
_g Fuel Cycle Branch Division of Nuclear Materials Safety U. S. Nuclear Regulatory Commission Region III 801 Warrenville Road Lisle, Illinois 60532-4351
Subject:
Task Actions Accomplished for Restart of Evaporation Operations
Reference:
Letter, Bruce J. Kaiser to Gary L. Shear, dated August 29,1996
Dear Mr. Shear:
Pursuant to our telephone conversion on the above subject, enclosed is a summary of actions taken in accordance with the listing included with the referenced letter. Essential actions have been satisfactorily completed and the three evaporation systems have been successfully retumed to service. Hazard analyses using the HAZOP method were conducted on the systems to identify failure modes, components important to safety, and further safety improvements. A number of minor recommendations were made based on these analyses and completion is being tracked by the Process Engineer. Results of the HAZOPs were also discussed during our October 16 meeting.
We will be glad to discuss any questions you may have concerning this matter. If you have any questions or need further information, please contact me or Mr. Hal Eskridge of my staff at (314) 937-4691.
Very truly yours, COMBUSTION ENGINEERING,INC.
y Robert W. Sharkey Director, Regulatory Affairs RA9&522 9612110308 961121 PDR ADOCK 07000036 l
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C PDR ABB CENO Fuel Operations Combustion Engineenng. Inc.
3300 State Road P Telephone (314) 937-4691 Post Office Box 107 (314) 29fr$640 Hematite. MO 63047 Fax (314) 937 7955 SRW t51BS
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Enclosure to RA96/522 November 21,1966 Task Actions Accomplished for Restart of Evaporation Operations Summary of Task 1 Actions (Dry Recovery System):
Based on completion of the actions identified, the opportunity for the mixing of incompatible chemicals has been eliminated. The existing piping and evaporation complex was dedicated to our dry recovery process and the evaporation of spent KOH only.
Disconnect mid cap-off wet filtrate piping to completely isolate the intrusion of filtrates into the KOH material flow.
Disconnection and cap-off of wet filtrate piping was complete prior to the startup of KOH evaporation. The piping has subsequently been modified as part of the filtrate startup tasks.
Lock out the filtrate pump.
Lock out the filtrate pump was completed prior to startup of KOH evaporation.
The lockout was removed at the startup of filtrate evaporation.
1 Remove the small evaporation tank from the evaporation complex. Use only the large e
tank and dedicate it to KOH liquid reduction.
Removal of the small evaporation tank is complete. As part of the filtrate startup the tanks were relocated to provide KOH evaporation within a separate dedicated dike area.
Remove the mop water boildown tank from the evaporation complex to preclude the intrusion of organics.
The mop water boildown tank has been moved to its own dedicated dike area.
Replace burned out light bulbs to improve lighting of the evaporation work area.
Burned out light bulbs were replaced.
Install communication equipment to provide for direct communication between e
operators during the transfer of KOH from the inside holding tank to the evaporation tank.
Radios were used at the time of KOH startup. Phones were subsequently installed and are now in use.
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. Enclosure to RA96/522 November 21,1966 i
.. Tag and label all equipment and valves.
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~ Equipment and valves necessary for operation of the KOH system were tagged (or labeled) prior to KOH startup. Valves, pumps, and instruments included in the 3
HAZOP analyses for the three systems are labeled. Valves for air, water, steam, steam condensate, and ammonia supply are labeled if shown on the HAZOP process and instrumentation diagrams.
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Use a log to improve shift-to shift communication between operators / supervisors.-
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A log to improve shift-to shift communication is in use.
Revise procedures using operator / supervisor input.
e Revision of procedures O. S. 806 and O. S. 853 is complete.
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Retrain operators and supervisors in procedures and management expectations for e
running this process.
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Training of operators and supervisors is complete and documented.
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Summary of Task 2 Actions (Wet Recovery and Mop Water System):
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Based on completion of the actions identified, the opportunity for the mixing of i
incompatible chemicals was eliminated by dedicating evaporation vessels to one specific service.
l Install separate piping and tank system for filtrates.
e Separate piping and tank system for filtrates is complete.
Relocate the KOH tank to a separate pad, away from the filtrate evaporation area.
e The KOH tank is relocated to a separate pad.
Install separate containment for mop water evaporation.
Mop water evaporation is in a separate containment dike.
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Enclosure to RA96/522 November 21,1966 Install separate secondary containment and sumps for the three evaporation systems e
(KOH, filtrates, mop water) to provide physical barriers and prevent any mixing.
The three evaporation systems are in separate secondary containment.
Install material transfer stop controls at the evaporation tanks to enable the operator to monitor tank filling.
Stop controls are installed.
Add additional lighting to the evaporation work area.
Lighting was added to the new KOII dike area. The lighting in the filtrate dike area is sufficient.
Use log for mop water to control constituents.
The mop water log is being used.
Revise procedures and train personnel.
e Procedures O. S. 806 and 853 have been further revised and procedure O. S. 850 has been revised to incorporate an improved filtrate sampling method. A special evaluation traveler was used to implement the mop water requirements which later became procedure 808.02.
Place all system equipment into a preventive maintenance program.
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Review by the HAZOP team determined which items were important to safety.
These items were lights, level switches, and the safety system activated by each level switch. The lights were submitted to the PM system prior to startup of the filtrate evaporation, however the level switches and associated safety equipment has just been received and installation has begun. They will be added to the PM system when installation is complete. As approved by the HAZOP team, operator monitoring is being substituted for the level switches in the interim.
An additional PM was added after restarting the operation to inspect piping and valves on an annual basis to identify leaks or other equipment failures.
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