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- g NRC POnu 173 U.S.NUCLEAM REGULATORY COMMISSION ORDE R NUMiiE R C-791 20-82-567 >
STANDARD ORDER FOR DOE WORK 'f'ugust18,1982 ISBUED TO. (DOE Officol ISSUE D SY: (NRC Of fical ACCOUNTING CITATION.
Albuquerque Operations Office Office of Nuclear Reactor ***ao'alATioa smo' Regulation , DST 31X0200.202
== Nuunn PERFORMING ORGANIZATION AND LOCATION 20-19-50-53-5 Sandia National Laboratory ria nuMaa Albuquerque, New Mexico A1298-2 WOR K PERIOD . THIS ORDER FIN TITLE FlxED Q ESTIMATED O Determination of Event Sequences Contributing to Overall FROM: TO:
Frequency of Core Melt 10/01/81 12/31/82 OBLIGATION AVAILABILITY PROVIDED BY:
A. THIS ORDER S gg NDER TH E "AP Al I SY 80L AN E IRS FOUR D IS F S san NuueEa" CITED asOvE.
E 2,221,000 C. TOTAL ORDERS TO DATE (TOTAL A & 81 32,286,000 D. AMOUNT INCLUDED IN "C" APPLICA8LE TO THE " FIN NUMBER" CITED IN THl3 ORDER. $
155.000 FINANCIAL FLEXIBILITY:
O FUNDS WILL NOT BE REPROGRAMMED BETWCEN FINS. LINE D CONSTITUTES A LIMITATION ON 08 LIGATIONS AUTHORIZED.
FUNDS MAY BE REPROGRAMMED NOT TO EXCEED 210% OF FIN LEVEL UP TO $50K. LINE C CONSTITUTES A LIMITATION
@ ON 08 LIGATIONS AUTHORIZED. If SEE BELOW STANDARD TERMS AND CONDITIONS PROVIDED DOE ARE CONSIDERED PART OF THl3 ORDER UNLESS OTHE,RWISE NOTED.
ATTACHMENTS:
THE FOLLOWING ATTACHMENTS ARE HERE8Y SECURITY:
MADE A PART OF THIS ORDER: $ WORK ON THIS ORDER l$ NOT CLASSIFIED.
Q STATE MENT O F WOR K (Modification) O WORK ON THIS ORDER INVOLVES CLAS$1FIED O ADDITIONALTERMS AND CONDITIONS INFORMATION. NRC FORM 187 IS ATTACHED.
O OTHER
\' REMARKS (Reference the proposal by number end date, and indscate if the attached statement of work modifies the DOE proposef:
This order modifies the SNL proposal dated May 14, 1982 as delineated in the attachment and provides incremental funds for continuation of work. Please t . submit a' revised proposal within 30 days to J. Ve111ette, DST, and provide a copy to B. L. Grenier, NRR.
After acceptance, please send to the NRC Office of Resource Management, ATTN: D'. Dandois ,
and provide a copy to the Office of Nuclear Reactor Regulation ATTN: D. Corley.
V. SSSUll% Mil $0RITY / ACCEPTINo ORGANIZATION smnaruma\
Q-A "" 5'oNatuas
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Stephe . anauer. Director'N1IL '
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. nna / of Safety TechnolOav Division vitta
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l hanges NRC FO on Nilsnis.7m within/1 Reprogramming limited to /
the same B&R Number and the
- ame Appropriation Symbol.otificd In order for 5 days so that an approprkhis within effectiv k llocatiFor,m this ff IN sto bbe to mu issued,eand ate can
- omplete the action prine tn receiDt of any bills.
- SHOLLYB4-243 PDR
4 MODIFICATIONS TO A1298
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A. Revise Task 2 to read as follows:
Task 2: Analysis of PRA .
For each plant PRA study, conduct Subtasks (a). through (d).
Subtask a) Review of PRA Determine the event sequences with significant contribution to core melt frequency and measures of frequency of release and risk.
Use' this information to:
- 1) rank these sequences according to their contribution to each of
.-the-above measures,
- 11) rank plant systems according to their contribution; and iii) whenever possible, rank major system components according to their contribution.
This process can be a'ided by determining logic mode s for each sequence, using sequence cut sets information or by constructing sequence fault treds and deducing cut sets. Proper level of detail is to be used by the analyst.
Subtask b) Sensitivity Analysis Use the methodology from Task 1 to determine the importance of systems and component unavailability. Rank plant systems (and components) according to their importance.
Subtaskc) Analysis of the Results .
Eval'uate results of subtasks "a" and "b" and provide insights about special . plant features (sequences, systems, components) relevant to core melt frequency or plant risk.
Subtask d) Reporting of Results A brief letter report will .be written giving the results of the sensitivity analysis. -
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b Modifications to Al298 Cont.) Page 2 B. Revise Task 3 to read as follows:
Task 3: Interim Comparative Analysis and Insights Documents Group the analyzed plants according to plant type (e.g., w/PWR's B&W PWR's, BWR Mark X ....) conduct comparative analysis within each group and whenever possible conduct inter-group comparison. Results of the comparative analysis and drawn insights should be provided on.
quarterly basis.
C. Add Level of Ef' fort and Period of Performance Level of effort is estimated at 12 staff' months over a period of 15 Months.
D. Add Meetings and Travel Sandia staff will participate in three meetings at NRC headquarters.(Provisions will be made for 2 staff members to attend three 1-day meetings at NRC head-quarters in Washington, D.C.) These may include attendance at hearings and participation at professional meetings.
E. Add NRC Furnished Material N/A 4
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