ML19261B130
| ML19261B130 | |
| Person / Time | |
|---|---|
| Issue date: | 02/03/1978 |
| From: | Woods R Office of Nuclear Reactor Regulation |
| To: | Baer R Office of Nuclear Reactor Regulation |
| Shared Package | |
| ML19261B131 | List: |
| References | |
| REF-GTECI-A-16, REF-GTECI-SY, TASK-A-16, TASK-OR NUDOCS 7902140025 | |
| Download: ML19261B130 (1) | |
Text
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NUCLEAR REGULATORY COMMISSION
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2 WASHINGTON, D. C. 20555
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FEB 0 3 E78
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MEMORANDUM FOR: Robert L. Baer, Chief, Reactor Safety Branch, 00R FROM:
Roy Woods, Reactor Safety Branch, DOR ih $*
THRU:
Carl Berlinger, Section Leader, Reactor Safety Branch, DOR SUBJ ECT:
SUMMARY
OF MEETING WITH GENERAL ELECTRIC COMPANY TO DISCUSS STEAM EFFECTS ON BWR CORE SPRAY DISTRIBUTION Representatives of the NRC Staff, the General Electric Company, and two utilities (Pacific Gas and Electric Company, and a consultant representing General Public Utilities) met on January 19, 1978 in Bethesda, Md. to discuss GE's plans in the subject area. A summary of the meeting, an attendance list, a letter stating agreements reached at the meeting and including additional infonnation requested, and copies of the presentation slides are attached.
- h. Vd Roy Woods Reactor Safety Branch Division of Operating Reactors
Enclosures:
As stated cc:
(See Attached List) 79021400d6
Attachment FEB 0 31978
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Meeting Summary - 1/19/78 Meeting with GE and Two Utilities To Discuss Steam Effects on Core Spray Distribution The meeting was to reach an agreement between the NRC staff and GE on an acceptable program to resolve the " steam effects on core distribution" concern.
Some of the material presented had previously been used at the 12/15/77 meeting held for the same purpose in San Jose, California. As indicated in the minutes to that meeting (dated December 29,1977), the 12/15/77 meeting ended without agreement. The NRC staff believed additional (3600 geometry) tests would be needed, and GE insisted the program they had outlined (without such tests) should be acceptable. At this meetino (1/19/78), GE changed the emphasis of the material, presenting their program as primarily based on experimental data which would have to be obtained individually for each BWR size and design.
Previously, GE had presented their program as primarily the development of a calculational spray distribution model, with experimental data used to qualify that model.
The NRC staff had been concerned that such a calculational model might be applied outside its range of qualification. That concern was eliminated by this change since greater emphasis is now placed on acquiring plant size and design specific empirical data.
Other material presented at this meeting (1/19/78) had not been previously seen by the NRC staff. The new material cited references that indicate most steam condensation effects on spray patterns from a single nozzle occur within the first 6" of flow trajectory outside the nozzle. Since interactions between adjacent nozzles on a typical BWR core spray sparger occur further than 6" away from the nozzle, this new material lends considerable support to 'iE's assumption that thermal (condensation) and hydraulic (interaction) phenomena are separable.
If thermal and hydraulic effects are separable, they can be investigated in separate experiments and combined using an analytical / experimental approach discussed at the meeting (see attached slides). GE proposes to independently verify the " separability" assumption utilizing the new test facility at Lynn, Massachusetts (see slides).
On the condition that tests at Lynn do verify the " separability" assunption, the NRC staff agreed that the proposed program outlined at the 1/19/78 meeting is an acceptable method for verification of the core spray distributions currently assumed in ECCS-LOCA licensing cal culations.
Details of the agreement reached and the assumptions and qualifications attached to the agreement were summarized in c letter sent to GE subsequent to the meeting (copy attached).
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Attachment FEB 0 3 M 1/19/78 GE Steam Effects on Core Soray Distribution Meeting Attendees Name Oroanization R. Woods flRC-DOR-RSB D. Ross NRC-DS3 W. Hodges NRC-DSS-AB L. S. Tong NRC-RES R. Mattson NRC-DSS Z. Rosztoczy NRC-DSS-AB V. Stello NRC-DOR C. Berlinger NRC-DOR-RSB R. Frahm NRC-DSS-Reactor Systems Br.
G. Mazetis NRC-DSS-Reactor Systems Br.
T. R. Robbins General Public Utilities (Pickard Lowe&Garrick)
J. E. Wood GE-Nuclear Technology Dept.
Taggart Rogers Pacific Gas & Electric Co.
Glenn Sherwood General Electric G. Dix GE-fluclear Technology Dept.
A. Levine GE-Licensing S. Sandoz GE-Nuclear Technology Dept.
J. Alai GE-Nuclear Technology Dept.
N. Shirley GE-Bethesda L. Gifford GE-Bethesda J. Reece NRC-DOR T. Novak flRC-DSS-Reactor Systems Br.