ML20070H185
| ML20070H185 | |
| Person / Time | |
|---|---|
| Site: | Clinch River |
| Issue date: | 12/21/1982 |
| From: | Longenecker J ENERGY, DEPT. OF, CLINCH RIVER BREEDER REACTOR PLANT |
| To: | Check P Office of Nuclear Reactor Regulation |
| References | |
| HQ:S:82:154, NUDOCS 8212230237 | |
| Download: ML20070H185 (6) | |
Text
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Department of Energy Washington, D.C. 20545 Docket No. 50-537 HQ:S:82:154 DEC 21 1992 Mr. Paul S. Check, Director CRBR Program Office Office of Nuclear Reactor Regulation U.S. Nuclear Regulatory Connission Washington, D.C.
20555
Dear Mr. Check:
INFORMATION ON THERMAL MARGIN BEYOND THE DESIGN BASE (TMBDB) FOR THE NUCLEAR REGULATORY COMMISSION'S (NRC) REVIEW Enclosed are the project's responses to the action items generated at the December 8,1982, NRC meeting. These responses concern:
filter efficier.cy
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for the venturi scrubber, plugging of the vent pipes behind the liners, and transmittal of HAA-3B microfiche for TMBDB analysis.
If you have any questions, please call W. Pasko (FTS 626-6096) of the Oak Ridge Project Office Public Safety Division.
Sincerely, hx CyNJtt Q/L J n R. Longenecker Acting DirectorV0ffice of Breeder Demonstration Projects Office of Nuclear Energy 3 Enclosures cc: Service List i
Standard Distribution i
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8212230237 821221 PDR ADOCK 05000537 A
I ENCLOSURE 1
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D:scription:. Ldto in tho C ntainment 'Syctem Tact Fccility (CS prescrubbers fall.
The filtration efficiency of the venturi scrubber in'CSTF tests ACS also fell, especia~lly l The. fall in filtering efficiency was in test AC5.
explained as entrained caustic scrubber solution.
Please justify why thi's cannot happen in the CRBR system with possible re-entrainment of soluble fission produ' cts
-(refer also to informal 1packground info).
f The Cantainment System Test Facility (CSTF) equipment Resconse: arrangement for tests AC-1 thru AC-4 did not utilize E
demisters downstream of. the prescrubbers (quench tank and venturi scrubber) because it was conceived that the -
The' final stage fiber scrubber will het as a demist'er.
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system operated in accordance with this plan and the overall efficiency of the' system remained constant thru ected, as the quench tank out the. tests...A.s fit was exp?' tank i;o31um ~concentrati6n '..E ~ -
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increase'd, the ~ carryover of: ths sodium increased and the " T '
.C' efficiency of the individual components (quench tank and venturi scrubber) decrea' sed.
But, sitce the fiber scrubber captured the droplet carryover from the venturi scrubber,
. the oyerall system efficiency remained constant.-
.It'is expected that'the ;centrainment of the soluble fission. products may affect the CRBRP sys, tem efficle'n'cy in the long'run, however due to the expected fission product solubility, half life and vent gas flow reduction, this effect,is expected to be minimal.
The evaluation of this effect will be considered in the system design and appropriate measures will be instituted to avoid droplet carryover if. required.
The' alternate measures considered for avoiding droplet carryover includes (1) addition of demister downstream of the ventubi scrubber or (2) bypassing the prescrubber stages (quench tank and venturi scrubber)-
after the sodium.boildry time, sidce the aerosol loading at this time could be handled with the fiber bed scrubber on1 e
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ENCLOSURE 2 MSp@
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NRC Concernt During DBk and TMBDB conditions t.ha cell linor buckles toward the insulating concrete.
The pressure exert 6d on the insulating concreto i
by the cell liner plate could create cracking and spalling of the insulating concrete and the resultant loose concrete particles could be carried into the cell liner vent pipes causing plugging of thusu pipes.
Resolution The examination of the prototypical CRBR l'iner in the HEDL LT-1 test Ladicated that the deformation of the liner place did not result in spelling.or separation of the insulating concrete and the liner vents were not collecting concrece particles or showed any indication of plugging from the insulating concrete.
During this test the insulating concrete surface was exposed to a maximum temperature of 1580'F and remained above 1500*F for approximately 80 hours9.259259e-4 days <br />0.0222 hours <br />1.322751e-4 weeks <br />3.044e-5 months <br />.
These temperatures and durations are closely approximating the. expected TMBDB conditibns and also enveloping the DBA conditions.
To supplement'.the above test result an a'asessment of the expectod liner boaring pressure on the insulating. concrete has been made for DBA and TM3DB conditions.
The assessment utilized the resulta of the different liner finito element analyses.
The assessment indicated that the calculated maximum bcaring pressuro at DBA condition is approximately sus or une allowante Act nearing stress.
rne result fo'r the TMBDB condit\\on also showed that the maximum bearing pressure is under the ACl allowable.
It.should bc also noted that the maximuta bearing pressure foi the TMBDB case occurs at the early part of the accident and the bearing pressure reduces to a nominsi valuu as the liner becomes sof ter at higher tamparatures.
On the basis of the above, it is not conceivable that the cell liner plate - insulating concrete interaction will impede the operation of the liner vent system.
Purthermore, per NRC's request, attsched horewith are the linor vent pipe installation detail and the typical velocity profile curve in the call liner gap.
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- s The microfiche of the HAA-38 computer code analyses for the TMBDB Base case and Margin Assessment case was provided to the NRC consultants on September 22, 1982.
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