ML20054D381
| ML20054D381 | |
| Person / Time | |
|---|---|
| Site: | 05000000 |
| Issue date: | 04/07/1982 |
| From: | Otey G, Amy Snyder SANDIA NATIONAL LABORATORIES |
| To: | Curtis R, Larkins J NRC OFFICE OF NUCLEAR REGULATORY RESEARCH (RES) |
| Shared Package | |
| ML19247E371 | List: |
| References | |
| CON-FIN-A-1270, FOIA-82-96 60-19-01-10, 60-19-1-10, NUDOCS 8204220647 | |
| Download: ML20054D381 (9) | |
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January 7, 1982
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I osu l Q.I)I PROJECT AND BUDGET PROPOSAL FOR NRC WORK O' 'T
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A f IN NUMH1 R P et O Ji C 1 1 a i t t A-1270 ilYDROGEN BURN SURVIVAL - EXPERIMENTAL N FI C H & F9 N U M B I A 60-19-01-10 NRC Of fICE Nuclear Regulatory Research CON 1 pi ACI DH ACCOUNT NUMBER 00789 DOE CONT R ACTOR Sandla National Laboratories DDE B&R NUMB ER SIT E 401001020 A lbuc tac ro ue, New Mexico "E H8000' Pt H F OH M A ug OncANsz4TsOn ris enONE Nuestn COcNiz e.Ni rt RsONNE L 51 AR11NG DAT E R.
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Curtis RES/SAAB 427-4326 08/01/81 NHC l'HOJECT MANAGER COMPLEilON DA1E OTHER NRC TE CHNICAL ST AFF J.
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o TECHNICAL PROPOSAL Performing Organization:
Sandia National Laboratories
Title:
Hydrogen Burn Survival - Experimental FIN:
A-1270 B& R No.:
60-19-01-10 Key Personnel:
L.
Cropp, Principal Investigator (FTS 844-8723)
W.
McCulloch, Project Engineer (FTS S44-7960)
J.
Aragon, Experiments (FTS 845-3076) 1.
BACKGROUND AND OBJECTIVES The experience at TMI-2 has indicated that it is possible to have an accident which would produce hydrogen in quantities signifi-cantly higher than predicted in a design basis accident.
Hydro-gen, when released, mixes with air and can form flammable or even explosive mixtures.
Schemes have been proposed to preclude violent reactions between hydrogen and air which could endanger the integ-rity of the containment.
One method is to maintain low hydrogen concentrations using igniter s to repetitively burn the accumulat-ing hydrogen.
Although this solution may reduce the probability of containment f ailures in some accidents, it may also cause the degradation of some of the equipment required for a safe and pro-longed plant shutdown.
At present, little is known about the survivability of such equipment in a hydrogen burn environment for the period during and after the burn until temperatures and pressures no longer threaten equipment.
Most of the information that is available is the result of tests conducted in enclosures considerably smaller than reactor con-tainments and its applicability to the full scale environment is uncertain.
To gain meaningful, quantitative information on the relationship between the burn environment and equipment surviv-ability, carefully planned analytical and experimental inves-tigations will be per formed.
Based on the results of these investigations, it is reasonable that methods or algorithms for predicting the survivability of vital equipment in a hydrogen burn environment can be developed.
This would provide the,N.RC with the basis for evaluating equipment survivability and a means for assuring that the equipment can perform needed safety functions.
It also would provide the basis for establishing criteria and standards needed to ensure that safety functions could be per formed during and af ter a hydrogen burn.
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The experimental efforts described in this proposal are part of the Hydrogen Burn Survivability Progr am and will be coordinated with analytical activities addressed in a separate proposal con-currently submitted to NRR.
The objectives of the experimental por tion of the Hydrogen Burn Survival Program are to conduct tests to experimentally verify NRR-funded efforts for developing methods to characterize the burn environment and to develop component behavior prediction methods.
These methods will enable the NRC staff to predict the ef fects of deflagration and post-deflagration environments on the equipment required for safe plant shutdown.
Analytical investigations funded by the NRR will be conductcd in an iter-ative mode with the experiments.
Information gained from the analyses and experiments will then be used to formulate a pro-cedure for evaluating safety-related equipment survivability.
For component evaluations, first ef forts will be directed toward five ice condenser PWR plants:
D.
C.
Cook 1, McGuire 1 and 2, and Sequoyah 1 and 2.
This ef for t is directed to obtain as much information as possible on the components in these plants by the time " Proposals for Equipment Qualification" are submitted for these plants.
By that time, now expected to be about January 1982, only preliminary modelling analyses and some scoping experiments will be available.
Complete component testing under the experimental portion of the program will not be finished by that date.
As detailed below, the work to be per formed will encompass ex-periments to verify methods which predict the hydrogen burn environment, the development of tests to simulate that environ-ment, and the development of component behavior prediction methods based on experimental results and analytical methods.
2.
SUMMARY
OF PRIOR EFFORTS A preliminary program plan covering the period through FY82 was developed, defining the objectives and statement of work for the H3S Program.
The estimated funding requirements exceeded re-sources available in FYB2, requiring a revision to the program plan early in FY82.
A list of safety-related equipment located inside the McGuire, Sequoyah, and D.
C.
Cook containment buildings was compiled, and four components (cable, hydrogen igniter, pressure transmitter, and solenoid valve) were selected for initial consideration.
Procurement activities for these items have been started.
Computer code's currently available and applicable to the HBS Pr.ogram have been identified.
s 3.
WORK TO BE PERFORMED AND EXPECTED R E S U L T_ S_
3.1 WORK AREAS.
Task 1 Program Planning and Management Comprehensive program plans will.be developed and coordinated with RES to clearly identify short-term and long-term program. objectives and deliverables, test facilities to be utilized, and test condi-tions for the experiments, including the combined ef fects of hydrogen burn and steam.
This will include planning meetings where Sandia, RES, and NRR develop network management char ts showing projected deliverables, schedules and responsibilities.
If required, plans for evaluating component survivability to detonation environ-ments will be made.
Task 2 Hydrogen Burn Environment Determination Tests Two series of experiments will be conducted in the Var iable Geometry Experimental System (VGES) to characterize the pressure and temperature environment during and af ter a hydrogen burn (deflagra-tion.
The information obtained from these experiments will be used to verify NRR-funded analytical development ef for ts.
The analytical methods developed will allow prediction of the burn and post-burn environments.
The ef fects of multiple burns and a range of hydro-gen concentrations causing deflagration will be simulated in tests.
Task 3 Determination of Equipment to be Analyzed To guide experimental test planning and analytical model develop-ment, a list of safety-related equipment in containment will be established.
The equipment listed will be limited to ice condenser PWR plants.
At the outset, a comprehensive list of components, including manufacturers and model numbers, will be established.
Based on equipment survivability estimates (preliminary model-ling) and confirmatory testing, the list will be trimmed to those components that do not clearly survive the predicted environments.
The possibility of developing generic component models will be investigated and suppor ted by experimentation.
Generic represen-tations are desirable to reduce the number of components that must be modeled and tested.
Equipment for experimental tests will be acquired from sources that can supply reactor qualified components.
Components acquired for testing will be audited for conformance to nuclear power plant qualification tests per Sandia Quality Assurance Provisions stated in the Sandia Dept. 4440 LWRS Quality Assurance Program Plan.
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n Task 4 Development of Component Test Descriptions Detailed documentation of test objectives, test conditions, test execution; pre-test and post-test component examination and func-tional testing of the exposed components will be prepared.
The documentation will reference the test facilities, fixtures and instrumentation required to conduct the tests.
This documenta-tion will be generated and RES concur rence obtained prior to test execution.
Task 5 Determination of Special Test Requirements Special test stands, test fixtures, test chamber s and instrumen-tation will be designed and fabricated as necessary to support component testing.
Task 6 Component Testing The selected safety-related components will be exposed to deflagra-tion environments.
These tests will be conducted in the VGES, FITS, Radiant Heat Facility or other test facilities, as necessary.
Temperature and pressure are the major variables of concern.
Single and combined effects will be studied.
Component responses to these environments will be used to verify the NRR-funded analytical component model development.
Using equipment survivability estimates to determine the ability of components to withstand deflagrations, the list of specific components to be tested may be r ed uced.
Those components showing marginal survivability will receive first priority for testing.
The equipment survivability estimates may show that large-scale temper,ature and pressure facilities will be required to adequately verify analytical techniques experimentally.
The major environments to be considered in testing are pressure, temperature, and any chemical reactions which ef fect sur face absorbtivity or other component material properties.
Sustained burning is one of the chemical reactions to be considered.
Selected components will be tested to evaluate the flammability of component materials.
After each test series, a letter report will be submitted to RES describing component per formance.
The results of pre-test and post-test examinations, along with functional test r esul ts, where possible, will be detailed.
Task -
Survivability Improvement Measures Component materials not surviving the tests will be evaluated.
If possible, measures that mitigate the burn ef fects will be described for further consideration by the NRC and/or the licensees.
These i
recommendations will fall into the category of external component shielding rather than redesign.
For example, the placement of metal foil around cables which exhibit flammability problems would be a representative type of recommendation.
The recommended
- L
shielding will not be assessed for. adequacy in this program.
In addition, Sandia is not r equir ed to make a recommendation in every instance, but will'suggest those that naturally appear during the
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course of the analysis.
3.2 EXPECTED RESULTS IN FY82 Develop a program implementation networ k char t to detail tasks, organizational responsibilities, and milestones for FY82.
The program plan will be updated for FY83 and following year s based on the testing and findings through FY82.
Special test requirements will be defined.
Any special test equip- _
ment required to support testing will be designed, fabr icated or procured.
After test facility requirements and the components to.
be tested are determined, the fixtures and equipment needed can be acquired.
Components required for component model verification and for other confirmatory testing will be acquired.
These components will then be tested in accordance with the documented test procedures.
Only.
limited component evaluation information will be available in FY82.
Detailed topical repor ts describing the test methodology, pre-and post-test component evaluations along with functional test r esults, where possible, will be gener ated at the conclusion of each test series.
Reports will be prepared for each specific component evaluated.
These reports will detail the test results, anomalies encountered, and any per tinent observations.
If applicable, cause' of failure and, if possible, cor rective action which might allow a component to pass the test sequence will be documented.
An in'terim r epor t on the results obtained through December' 1981 will be generated as a preliminary program document to detail the information obtained during that time period.
4.
DESCRIPTION OF FOLLOW-ON EFFORTS It is expected that the H3S problem for land-based ice condenser pressur ized water reactor s ( PWRs) in deflagration environments will have been assessed for several components and the assessment will be at least initiated for boiling water reactors (BWRs).
In FY83, the effort will be extended to:
1.
Treat detonations in ice condenser and Mark III containments.
2.
Consider localized deflagrations and detonations in large dry PNRs.
(Because of their large containment volumes, these reactor systems are thought to be essentially immune to containment str uctural failures resulting from hydrogen gener ation in degraded cores).
3.
Include the testing and analysis of additional components.
4.
Develop an algorithm to allow evaluation by NRC of treatments of the hydrogen burn problem in future reactor licensing actions.
5.
Disseminate information pertaining to HBS by conducting a public workshop.
5.
RELATIONSHIP TO OTHER PROJECTS This effort is related to other programs (underway or completed) which involve reactor safety, componen t testing, and hydrogen analysis experiments.
Hydrogen Program RES A-1246 Combustible Gas in Containment RES A-1255' Hydrogen Burn Survival Analytical NRR A-1306 Steam Explosions RES A-1030 Containment Analysis RES A-1198 Safety Margins for Containment RES A-1249 Independent Verification Testing I&E B-3101 Qualification Testing Evaluation RSR A-1051 Fir e Protection Research Prog r am RSR A-1010 6.
REPORTING REQUIREMENTS Upon completion of each task, a letter report will be provided to the RES br anch chief.
The letter repor t will including in fo r ma' tion relating to equipment selection and information the NRC can write into the safety evaluation and supplemental safety repor ts.
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A monthly business letter will be submitted by the 15th of each month to the cognizant RES manager, R.
Curtis, and SAAB project manager, J.
Larkins.
Copies will also be sent to the cognizant NRR personnel.
These repor ts will pr esent br ief discussions of:
a)
Significant accomplishments for the reporting period; b)
Significant accomplishments projected for the next reporting period; c)
Problems encountered during the reporting period with proposed responses; l
i d)
Changes to program plans and budgets; and e)
Status of manpower and funding expenditures.
No more than 30 copies of any report will be furnished to the NRC monitor.
W.
L. Gar ner, Supervisor, Technical Wr iting Division, Sandia National Laboratories, Albuquerque, has been designated as the authorizing official for publications for NRC Form 426.
7.
JUSTIFICATION FOR MAJOR AND SUBCONTRACT ITEMS An estimated $40K may be expended for outside test support.
These f und s are for complementary of f-site testing which cannot be per-formed at Sandia.
8.
LIST OF CAPITAL EQUIPMENT REQUIRED A list of laboratory capital equipment required in suppor t of the HBS Program in FY82 is shown in Attachment A.
These items are needed for experimental set-up and data acquisition.
9.
UTILIZATION OF FACILITIES __AND TEST INSTALLATIONS The bulk of the testing will be conducted in the VGES test chamber and Radiant Heat Facility.
The FITS Chamber and others may be used to suppor t specific test requirements.
Only $140K is currently planned for testing in these facilities.
10.
CONPLICT'OF INTEREST No significant contractual or organizational relationships of Sandia National Laboratories, its employees, or anticipated subcontractors and/or consultants exist with industries regulated by NRC and suppliers thereof, that might give rise to an apparent or actual conflict of interest. -
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ATTACHMENT A TABLE 1 CAPITAL EQUIPMENT REQUIREMENTS FOR FY82 HYDROGEN BURN SURVIVAL PROGRAM 2
Quartz Test Chamber e $25K
$ 50K 400 Radiant Heat Test Lamps 9 $4 0 16K Lamp Array Frames 20K 2
Data Acquisition System @ $15K 30K Storage Memory Oscilloscope 13K (Tektronics 7623A - $13K)
Test and Measurement (Multimeter) System SK (Tektronics TM 500 - $5K) 8 Power Supply e $1,250 10K Miscellaneous Test Instrumentation 8K Temper atur e Tr ansducer s/Tr ansmitter s Pressure Transducers / Transmitters Strain Gages and Transmitters TOTAL
$152K S
$