ML20211F406
| ML20211F406 | |
| Person / Time | |
|---|---|
| Issue date: | 01/31/1986 |
| From: | Lee T NRC OFFICE OF NUCLEAR REGULATORY RESEARCH (RES) |
| To: | Powers D SANDIA NATIONAL LABORATORIES |
| Shared Package | |
| ML20211F389 | List:
|
| References | |
| FOIA-87-8 NUDOCS 8702250081 | |
| Download: ML20211F406 (12) | |
Text
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Dr. D. Powers, Supervisor Division 6422 Sandia National Laboratories g gy g Albuquerque, NM 87185
Dear Dr. Powers:
Now that the SURTSEY vessel is in place, it is time to re-evaluate our program on high pressure melt ejection / direct containment heating.
This is to fonnalize the verbal request I made on my recent trips to SNL for a revised and updated plan for the HPME/DCH program.
As you will agree, HIPS Program Plan which was published in August 1984 was developed to confirm the contention in Zion Probability and Safety Study that molten core materials ejected under pressure will be dispersed out of the reactor cavity so that the core-concrete interaction will not be a problem.
Safety hazards that could be induced by thermal and chemical energy of dispersing debris are being recognized only recently.
The SURTSEY vessel is procured for the purpose of quantifying the effects of direct containment heating so that the test program plan should be revised to reflect this change in the goal.
The revised program plan should include a short discussion of progresses in this area since 1984, your recommendations on how to resolve this safety issue, tasks you are proposing to underteke and relevance of these tasks to the final resolution of the issue. Additionally, for our administrative use, you are also requested to provide the schedule, major milestones and estimation of required resources.
A meeting is currently planned for January 29, 1986 at Willste Building in Silver Sprin.g, MD for an informal review of the direct containment heating programs.
Participation from NRR, RES, SNL and BNL is anticipated.
It will be highly appreciated if you could have a rough draft of the revised program plan ready for the meeting.
Sincerely, Tim M. Lee Containment Systems Research Branch distributicn:
circ; chron; [efugRCurtis; BMorris; FGillespie; CKelber; Dross; RMinogue; TSpeis; ZRosztoczy; FEltawila; MErnst; MCunningham; JMitchell 0702250081 070217 PDR FO,IA SHOLLYB7-8 PDR OFC: CSRB
&CQB NAME LhE3 CbRTS DATE: 1/3c/86
- 160/86 O
HIPS PROGRAM PLAN and SURTSEY TEST MATRIX for FY86-87 William W.
Tarbell Sandia National Laboratories Presented Jan 29, 1986 Silver Spring, MD N
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ISSUES Containment failure by DOH (Direct Containment Heating)
Aerosol source term Simultaneous events
-hydrogen recombination
-aerosol scrubbing I
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l BACKGROUND ANL experiments used to establish IDCOR position
-dispersal-plant specific
-only small particles participate in DOH
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SNL results indicate potential DOH problem l
-complete debris removal l
-debris not trapped by structures
-large aerosol generation
-rapid transfer of debris energy (chemical and thermal)
PROGRAM OBJECTIVES Measure rate of energy transfer to atmosphere Determine influence of cavity and containment geometry Find effect of mass scaling Study interaction of water in the cavity Quantify aerosol release and behavior l
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RESOLUTION OF ISSUES Develop model for direct containment heating.
-Stand alone?
-Code module?
-Risk assessment?
Determine radionuclide source term.
l l
EXPERIMENTAL APPROACH Use 1:10 linear scale cavity models Variable amount of mass Incorporate SURTSEY Direct Heating Test Facility
-Direct measurement of pressure and temperature increase
- Collection of debris and aerosols Realistic atmospheric conditions Test conditions
-Gas species and pressure
-Debris temperature and composition Fission product mocks Chamber atmosphere n-- - --
SURTSEY DIRECT HEATING TEST FACILITY Expected operational date:
March 1986 Current status:
vessel erected and integration started Specifications:
-93 m3 volume m diameter by 11-m tall
-150 psi (1.0 MPa) design pressure
-Steam j acketed (500K wall temperature)
-Multiple penetrations
TEST MATRIX Mass scaling (2 tests)
-20 kg preliminary
-80 kg Zion cavity Debris dispersal (3 tests)
-Immune cavity (Surry, Millstone, Sequoyah)
-In-containment structures Energy transport (3 tests)
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-Inert atmosphere
-Steam plus hydrogen
-Water sprays I
Cavity water (1 test) l
-Water locked Zion cavity
ANALYTICAL EFFORT Debris transport
-Physics of debris-structure interactions
-Particle reentrainment Energy transfer
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-Single drop energy transfer model
-Debris plume (multiple particles)
-Influence of air-borne water Aerosol source term model i
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l SCHEDULING and COSTS First test mid March
'86 Expected frequency of tests:
6-8 weeks each (6 to 8 per year)
Manpower an'd materials:
~$90k per test (only 5 tests per year at current level) i
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(
i SURTSEY l
Direct Heating Test Facility i
)
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