ML20134K732

Summary of 850731 & 0801 Briefings W/Doe & Contractors in Bethesda,Md Re Small HTGR Functional Analysis/Design. Agenda & Attendee List Encl

ML20134K732
Person / Time
Issue date:	08/22/1985
From:	King T Office of Nuclear Reactor Regulation
To:	Speis T Office of Nuclear Reactor Regulation
References
NUDOCS 8508300385
Download: ML20134K732 (5)

Text

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i August 22, 1985 MEMORANDUM FOR: Themis P. Speis,~ Director, Division of Safety Technology, Office of Nuclear Reactor Regulation FROM: Thomas L. King, Chief, ARG, Division of Safety Technology, Office of Nuclear Reactor Regulation

SUMMARY

OF BRIEFING ON ADVANCED HTGR DESIGN On July 31 and August 1, 1985 DOE and its contractors provided us with a briefing on the status of their selected HTGR concept and the " top down" approach used to arrive at this design. The agenda and list of attendees are enclosed. Copies of the handouts from the briefing are available in my office. Significant points from the meeting were:

1) DOE confirmed the concept selection as the modular, side by side steam generator, steel vessel HTGR concept with the choice of a pebble bed versus prismatic core still under evaluation. Final selection of the core concept will be made by September 30, 1985.

2) The arrangement of modules is in groups of four with a common turbine and common control room.

3) The portion of the plant which NRC will be requested to review at the conceptual design stage is the nuclear island. This will include all safety related systems.

The review of other plant systems (turbine, steam /feedwater system, etc.) will be mainly of the functions and interface requirements associated with these. It is a goal of this concept to concentrate all safety related functions into the nuclear island and thus have the option in the balance of plant to build to different standards.

4) The design utilizes active systems for normal decay heat removal and reactor shutdown. f Passive means are provided as backup for accomplishing these functions; however, if the passive means are used the plant could experience -

economic loss (i.e., loss of lifetime).

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5) The design has no containment. A safety grade confinement system is used in the design.

A number of areas in the design are still subject to on-going design trade-offs and a briefing on the design, after these design trade-offs are completed, was tentatively scheduled for October 1985.

The briefing was useful in that it was the most complete description of the design, and the basis for the design, received to date. This has allowed us to begin to identify what we believe are key safety issues associated with this design and to initiate plans to focus on these areas in FY 86, prior to DOE's submittal of the HTGR-PSID.

If you would like to see the handouts from the briefing or discuss any of the above further please let me know.

Thomas L. King, Chief Advanced Reactors Group Division of Safety Technology Office of Nuclear Reactor Regulation

Enclosures:

As stated Distribution

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Enclosure AGENDA SMALL HTGR FUNCTIONAL ANALYSIS / DESIGN BRIEFING JULY 31 AND AUGUST 1, 1985 U.S. NUCLEAR REGULATORY COMMISSION - PHILLIPS BUILDING, ROOM P-110 7920 NORFOLK AVENUE, BETHESDA, MARYLAND WEDNESDAY, JULY 31 9:00 AM INTRODUCTORY COMMENTS NRC OBJECTIVE OF MEETING DOE 9:30 AM OVERVIEW 0F INTEGRATED APPROACH TO DESIGN GA 10:30 AM G0AL 1 EXAMPLE FOR SEVERAL KEY FUNCTIONS GA o TOP LEVEL USER RQMTS/ REGULATORY CRITERIA o FUNCTIONAL ANALYSIS TREE / WORK SHEETS o DESIGN SELECTIONS 12:30 PM LUNCH 1:30 PM GOAL 2 EXAMPLE FOR SEVERAL KEY FUNCTIONS GA 3:00 PM G0AL 3 EXAMPLE FOR SEVERAL KEY FUNCTIONS GA THURSDAY, AUGUST 1 9:00 AM OVERVIEW 0F PLANT AE 9:30 AM REACTOR SYSTEM GA o KEY FUNCTIONS AND REQUIREMENTS o DESIGN SELECTION DETAILS HEAT TRANSPORT SYSTEM GA REACTOR VESSEL CE SHUTDOWN COOLING SYSTEM GA REACTOR CAVITY COOLING SYSTEM AE 12:30 PM LUNCH 1:30 PM REACTOR BUILDING AE FUEL HANDLING GA PLANT CONTROL GE 4:30 PM

SUMMARY

DOE

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Enclosure NRC/ DOE MEETING ON HTGR FUNCTION DESIGN JULY 31, 1985 ATTENDEES ORGANIZATION T. King NRC/NRR P. Williams NRC/NRR S. Sands NRC/NRR C. Allen NRC/NRR G. Arndt NRC/RES R. Foulds NRC/RES G. Sherwood DOE R. Ng DOE D. Mears GCRA A. Kelly GCRA T. Neylan GA A. Shenoy GA G. Bramblett GA F. Silady GA N. Brown GE J. dilauro C-E R. Whitacre EG&G Idaho, Inc.

L. Walker SWEC P. Kroeger BNL S. Ball ORNL W. Barthold ORNL S. Lynch Bechtel T. Sweeney Bechtel L. Lidsky MIT J. Maneke MIT T. Jenkins TVA I

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Enclosure L

NRC/ DOE MEETING ON HTGR MODULAR DESIGN August 1, 1985 ATTENDEES ORGANIZATION T. King NRC/NRR P. Williams- NRC/NRR R. Foulds NRC/RES G. Sherwood DOE

, N.. Brown GE l -A. Kelly GCRA .

T..Neylan GA

.L. Lidsky MIT R.-Ng DOE G. L. Plumlee NRC/NRR

' G. Millman NRC/RES W. Barthold ORNL i B. Copp EG&G Idaho, Inc.

B. Whitacre EG&G Idaho, Inc.

T. Sweeney Bechtel S. Lynch Bechtel G.'Arndt NRC/RES l S.-Sands NRC/NRR i J. Anderson GAT l

J. Maneke MIT l T. Jenkins TVA l G. Van Tuyle BNL ,

l, P. Kroeger BNL L G. Bramblett GA l- F. Silady GA L. Walker SWEC

B. Sheridan SWEC J. dilauro C-E S. Ball ORNL

.A. Shenoy GAT l

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