ML20155F212
| ML20155F212 | |
| Person / Time | |
|---|---|
| Site: | Crane  |
| Issue date: | 04/14/1986 |
| From: | Travers W Office of Nuclear Reactor Regulation |
| To: | Harold Denton, Miraglia F Office of Nuclear Reactor Regulation |
| References | |
| CON-NRC-TMI-86-033, CON-NRC-TMI-86-33 NUDOCS 8604210409 | |
| Download: ML20155F212 (5) | |
Text
L April 14, 1986 NRC/THI-86-033 MEMORANDUM FOR:
Harold R. Dentor., Director Office of Nuclear Reactor Regulation Frank J. Iliraglia, Director Division of PWR Licensing-B FROM:
William D. Travers, Director TMI-2 Cleanup Project Directorate
SUBJECT:
NRC TMI-2 CLEANUP PROJECT DIRECTORATE WEEKLY STATUS REPORT FOR APRIL 7 - April 13, 1986 4
1.
DEFUELING As of April 13, 1986, a total of 42 defueling canisters have
.'n loaded with fuel debris and transferred to the canister storage racks in the fuel building. The total weight of debris transferred out of the reactor vessel is 47,500 lbs.
Fuel debris in the fom of small loose rubble which is amenable to
" pick and place" defueling using a spade-bucket tool has been substantially depleted. The remaining loose rubble consists nainly of either fine debris, or pieces that would require some sizing operation before they can be placed into defueling canisters.
Both vacuum defueling of the fine debris and sizing operations (e.g.,
cutting, shredding or separating) would require good underwater visibility which is not available due to the biologic growth. The licensee has halted the defueling operation to implement a micro-organism treatment and control program.
Preparations are in progress to begin a program designed to kill the biological contamination in the reactor coolant system (RCS). The program includes manual brushing and hydrolazing to remove the adherent growth from the surfaces inside the reactor vessel, circulating the RCS water through a high pressure pump, and filtering the pump effluent through a diatomaceous earth filter to remove the dead organisms. Laboratory and pilot scale testing have demonstrated that the rapid pressurization and depressurization that occurs when the water passes through a high pressure positive displacement pump is effective in destroying most of the organisms and that the remaining biological debris is readily filterable. The entire operation is expected to take about one week.
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April 14, 1936 Frank J. Miraglia NRC/Till-86-033 2.
PLANT STATUS The reactor reaains in long term cold shutdown, vented to atmosphere. Core cooling is by natural heat loss to ambient building atmosphere. The average of the incore themocouple average is 79 F.
The airborne radioactivity on the defueling platform is about 1.7 E-7 uC1/cc Tritium and 3.2 E-11 uCi/cc Cesium-137. The platform is nounted above the modified internalt indexing fixture which is nounted on the reactor vessel flange. These provide water coverage of 151 feet over the core region. This water level is about 5 feet over the top of any debris canisters in the reactor vessel.
3.
WASTE MANAGEMENT The Subnerged Demineralizer System (SDS) is shutdown. SDS total processed to date is 3,885,859 gallons.
EPICOR II was in temporary shutdown this week. EPICOR II total processed to date is 2,854,371.
4.
ENVIRONiiENTAL MONITORING US Environmental Protection Agency (EPA) sample analysis results show Ti1I site liquid effluents to be in accordance with regulatory liaits, NRC requirements, and the City of Lancaster Agreement.
Tril water-samples taken by EPA at the plant discharge (1acludes THI-1 and THI-2) to the river consisted of 14 daily composite samples taken from March 22 - 29, 1986. A gama scan detected no reactor related activity above the lower limit detectability. Trace indications of Iodine-131 may be present but not in sufficient quantities to be quantified or clearly identified.
The Lancaster water sample taken at the water works intake and analyzed by EPA consisted of a seven day composited sample taken from March 22 - 29, 1986. A ganea scan detected no reactor ralated radioactivity.
The NRC outdoor airborne particulate sampler at the THI site collected a sample between April 3 - 10, 1986. No reactor related radioactivity was detected. Analysis showed Iodine-131 and Cesium-137 concentrations to be less than the lower limits of detectability.
5.
AUXILIARY AND FUEL !!ANDLING BUILDING ACTIVITIES Scabbling and painting of the floors in the neutralizer tank rooms were done tais week.
Scabbling and painting of the floors in the mini-decay heat pump room area were done.
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3 April 14.-1986 Frank-J.-Miraglia
-NRC/THI-86-033 About 90% of the general area floor in the 281' elevation fuel handling building has been released for street clothing access.
6.
RADI0 ACTIVE HATERIAL SHIPMENTS Laundry - Contaminated laundry was sent from TMI site to Royersford, PA on these dates:
March 4 - 92 drums and 2 boxes 0
March 11 - 86 drums and 5 boxes March 18 - 78 drums and 5 boxes
'y March 25 - 130 drums and 3 boxes March 31 - 107 drums and 4 boxes
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Samples - Unit 2 reactor building basement concrete core bore
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samples were sent to Scoville, ID for research analysis on March 14, 1986.
Waste - A combined unit shipment of 72 drums and 6 boxes of waste were sent to Richland, WA for burial on March 17, 1986.
Samples - Unit 2 samples of air inside the reactor building were
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sent to Pittsburgh, PA for analysis on March 13, 1986.
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7.
NRC EVALUATIONS IN PROGRESS Technical Specification Change Request number 49, and 51.
Recovery Operations Plan Change number 31, 33, 35, and 36.
Core Stratification Safety Evaluation.
Solid Waste Facility Technical Evaluation Report.
!p Reactor Building Sump Criticality Safety Evaluation Report.
'c TMI-2 Temporary Reactor Vessel Filtration System Safety Evaluation Report, Revision 1.
Underhead High Pressure Decon Safety Evaluation Report.
Hydraulic Shredder Safety Evaluation Report.
l.
Canister Handling and, Preparation for Shipment Safety Evaluation Report.
Defueling Canister Technical Evaluation Report, Revision 2.
Penetration 536 Modification Safety Evaluation Report 8.
PUBLIC MEETING
- y On the evening of April 10, 1986, the Advisory Panel for the lr Dacontamination of Three Mile Island Unit 2 held a public meeting at the Holiday Inn, Center City, Harrisburg, PA.
At this meeting the Panel received a briefing by T. Denmitt, Deputy Director, TMI-2, on the status of defueling.. The Panel expressed interest on the issue of micro-biological growths in the reactor coolant l_
systen. The licensee described the extent of the problem and presented
.j, their plans for controlled growth of the micro-organisms, m
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The NRC staff provided a status report on regulatory issues related to TMI-2. This included a brief summary of the flRC Advisory Comraittee for Reactor Safeguards conclusions on the potential for recriticality during defueling.
The Panel also received cocnent fron members of the public. The next meeting of the Advisory Panel is scheduled for June 11,1986 from 7:00 Pil to 10:00 Pil at the lloliday Inn, Ccnter City, Itarrisburg, PA.
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