ML20141H288
| ML20141H288 | |
| Person / Time | |
|---|---|
| Issue date: | 01/06/1986 |
| From: | King T Office of Nuclear Reactor Regulation |
| To: | Speis T Office of Nuclear Reactor Regulation |
| References | |
| NUDOCS 8601130515 | |
| Download: ML20141H288 (5) | |
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JAN 6 19 #
MEMORANuuM FOR: Themis.P. Speis, Director Division of Safety Review and Oversignt THNU Karl Kniel, Chier Satety Program Evaluation Branch Division of Safety Review'ona uversight FROM:
Thomas L. King, dection Leader
~5afety Program Evaluation' branch Division of Safety Keview and Oversight.
SUBJECT:
BedEFING BY RI ON SHUTDOWii NEAT REMOVAL SYSTEM (sHnd)
- FOR THE SAfitDESIGN' CONCEPT
' On' November 20, b85 the D0E and its contractors briefed us on tne aesign, operation and evaluation of tne shutdown Heat Removoi system (SHRS) for the Socium Advanced Fast Reactor (SAFR) design concept proposed by Rockweil International (RI). The.sAFR design concept nau oeen described at.a previous
. briefing on November 6~, 1985. Copies of the agenda for tnis meeting and the-list of attendees are enclosed. A set of tne view graphs used in tne presen-tation 'is' available for inspection at the section office.
Ine sHRS for SAFR consists of three heat removal patns:
the normal path through the steam generator (SG) and condenser-(N5 HRS); the direct reoctor duXiliary Cooling sysLem (DRACS) which uses a single invessel heat exchanger
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and a naturol-convection flow patn to a sodium to air heat:excnanger; and the reactor air' cooling system (RACS) wnich is a natural convection of air past the
- reactor guard vessel. DKACS requires operation of dampers on the ex-vessel ndtural draft heat exchanger (DRHX) and an internal automatic gas valve to redirect internal flow under aecay heat - low flow conditions. The valve is passively operated by differential pressure. TheLRACS system operates contin-
. uously cnd is considereu tne only safety grade system.
Ine desic, of the SHRS is-pased upon several principal. design criteria (i'DCs) regarding coulant' inventory, heat removal capabilities ana inspection and testing..in aadition, the Commission's interim safety goold' were imposed on
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the design. Finally, it is RI's goal to minimize the potential for severe accioents, to assure inherent response to all creciole. accidents and to-eliminate the need for offsite evacuation of tne public. The process for applying these requirements and criteria and tne associated economic analysis
. supporting selection of'the SHRS design'was described.
'RI; believes that adequate design requirements can be established and met witn only a tew-safety-grade systems. These: include tne reactor vessel and guard vessel (RV:and GV), tne RACS and some assoc 14ted equipment and the inA and some or its associated equipment. RI believes it is aaequate to treat the r
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T..P. Speis UrtAC5, IHTS and SG and the steam /feedwater system as nigh quality commercidi-systems with some " upgrades." tixamples of upgrades dre; 100% radiographic inspection for welds in DRACS, the IHT5 ano the main steam and feeawater lines; upgraded inspection and joint design for neat exchangers; ano d number of other upgrades described in tiie view graphs. This is an area that will require considerabie review.
Ri provided a detailed description of the design ond operation of the SHK5 for SAFR. -io obtain credit for the reliability of these systems the staff noted that the ISI requirements should be faentitied in the technicoi 5pecifications.
RI agreed to give this further tnuught.
RI provided a aescription of the reliaoility analysis it has performed for the-SHRS. The description included models, reliability data, creatment
- or common-cause failures, treatment of credit for repairability and comparison to the Commission's safety goals.
Inis analysis has also been accumented in a report wnicn we will review as part of the Preliminary Sarety Information Ducument (PSID) review for SAFR.
x1 also provided a detailed description of tne overall SHRS performance dnd ysis it has made to ddte. Details of the results are given in the view graphs.
In sumary it appears that the design nas the potential for acequately removing decay heat in d passive mode.
Finally, RI provided a aescription of the safety R&D requirements ano its plan for satisfying tnese requirements, together with associateu cost estimates.
The R&D, in general, involves demonstrating in-vessei performance (flow charac-teristics), heat transfer rates and systems interdctions. RI noted that considerable tecnnology exists today, ooth domestic and foreign, to support the 5 HRS designs.
RI's pleri ror demonstrating the 5HHS capabilities is to utilize l
dnalysis of the various systems to predict tne system response followea oy verification of the prediction by test using various existing facilities (e.g.,
- AI/ETEC, ttsk-II, FFTF, etc.) as well as utilizing some existing test data from tne CKtsR.
In addition, a series of tests during initid'l startup testing or tne first plant would De aone to confirm the design.
Thomas L. King, Set. tion Leader Safety Program Evaluotion Branch uivision of Safety Review and Oversight utt- :USR0:SP,E
- DSRO:SPto
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isiiti :l Kiln
- KKniel
_____:.___'g:gd UATE :01/1,/86
- 01/t//80 0FFICIAL Rttuisu COPY
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JAN 6 7986 DISTRIBUT"0M kEWKrtTLFll]4 DSR0/CHRON SPEB R/F CAllen~R/F CAllen-TKing BSheron KKniel ZRosztoczy-JSwift' HHolz RColmar LSoffer RJohnson FEltawila-DThatcher' SShaukat-PNorian EChelliah RCurtis,.RES
.RAudette, RES MEl-Zeftawy, ACRS
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AGENDA SAFR SHRS PRESENTATION TO NRC l
NOVEMBER 20,1985 4
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- DESCRIPTION OF OVERALL PLANT DESIGN......... BOB LANCET l
- DESIGN BASIS OF SHRS.......................... DALE ROGERS i
- SHRS MECHANICAL DESIGN..................... CLYDE GERBER l
- SHRS DESIGN FOR OPERATIONAL SUPPORT...... CLYDE GERBER i
e RELIABILITY / RISK ASSESSMENT........... PHIL RUTHERFORD s OVERALL SYSTEM PERFORMANCE ANALYSIS... CLYDE GERGER m RACS PERFORMANCE ANALYSIS.......... CLIFF MARTIN - CE l
- S H R S R & D....................................... B O B LA N C ET I
- S U M M AT I O N..................................... B O B LA N C ET
$wu-Rocketdyne Divleion 5-36-0 i
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~t RI SAFR SHRS November 20, 1985 Name Organization Telephone j
C. Allen NRC/NRR/ DST 301-492-8345 R. Audette NRC/RES/DAE FTS-427-4689 W. C. Horak 8NL 516-282-2627 S. T. Gray EPRI-GM0 312-961-4158 R. D. Rogers AI 818-700-3318 C. B. Martin CE 203-285-4613 R. C. Gerbar AI 818-700-3985 H. B. Holz NRC/NRR/ DST 301-492-8683 G. Sherwood DOE /NE-43 FTS-233-4162 T. L. King NRC/NRR 301-492-7347 Karl Kniel NRC/NRR 301-492-7359 E. S. Chelliah NRC/ DST /NRR 301-492-8338 K. Shaukat NRC/NRR/ DST 301-492-4216 P. Norian NRC/ DST 301-492-7487 P. Williams NRC/ DST /ARG 301-492-7648 l
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