ML20053B036
| ML20053B036 | |
| Person / Time | |
|---|---|
| Issue date: | 01/26/1982 |
| From: | Advisory Committee on Reactor Safeguards |
| To: | Advisory Committee on Reactor Safeguards |
| References | |
| ACRS-1940, NUDOCS 8205270666 | |
| Download: ML20053B036 (7) | |
Text
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9 PROPOSED MEETING MINUTES S
OF THE RECElvgo RELIABILITY AND PROBABILISTIC ASSESSMENT 2
MAY 2 01982g s
SUBCOMMITTEE OF THE ACRS pj ng
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JANUARY 5, 1982 g
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Purpose:
The purpose of the meet.ing was to review the NRC Safety Research Budget for the Systems and Reliability Analysis Decision Unit and to be informed of the Probabilistic Assessment Research sponsored by NRR.
Principle Attendees:
ACRS D. Okrent, Subcommittee Chairman J. C. Ebersole, ACRS Member W. Kerr, ACRS Member C. P. Siess, ACRS Member G. R. Quittschreiber, ACRS Staff J. M. Griesmeyer, ACRS Staff NRC Staff R. Benero, RES/DRA J. Malaro, RES/DRA G. Burdick, RES/DRA M. Fliegel, NRR/HGEB G. Lear, NRR/HGEB D. Basdekas, RES/ICB F. Rowsome, RES/DRA G. Tomlin, RES/DRA A. Thadani. NRR/RRAB A copy of the agenda is attached, as is a list of handouts that were provided by the various speakers.
The portions of the meeting that concerned the safety research budget were closed.
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RELIABILITY AND PROBABILaSTIC ASSESSMENT MEETING MINUTES January 26, 1982 1.
A.
Thadant of NRR described the NRR Technical Assistance program in the area of Probabilistic Risk Assessment (PRA).
There are three categories of effort: casework, operating reactors, and sa fety technol ogy.
The casework is to look at ATWS and the Limerick PRA. The work on operating reactors includes reviews of the Zion, Indian Point, and Big Rock Point PRAs, some work on TMI action items and specific safety issues, and efforts to rank risks in the SEP review of the Palisades and Ginna power plants.
The safety technology efforts are to deal with event sequences, adoptation of methods from other industries for i
l reliability assurance, and fluid systems unavailability.
One goal of the NREP program is to develop an approach to the end uses of PRA's and it is planned to issue a Commission paper on the subject in a few months. The funding for the PRA Technical Assistance contracts was to be
$2 Million in FY 1982 and $3 Millon in FY 1983.
2.
M. Fliegel and G. Lear of the Hydrologic and Geotechnical Engineering Branch described flood research needs in NRR.
They would like to ascertain the l
adequacy of the design basis flood determinations.
For some conditions they l
felt that the current practices was too conservative.
In the discussion it was suggested that smaller floods of possible internal origin could represent more risk because there may not be the advance warning needed to allow time for rerigging of' the plant.
3.
D.
Basdekas of the Instrumentation and Control Branch (ICB) presented the program to investigate the safety implications of control systems.
The program
(
RELI ABILITY AND PROBABILISTIC ASSESSMENT MEETING MINUTES January 26, 1982 was intended to help resolve generic items A47 and A49.
The reliability of control systems part of the work is scattered through various programs in the SARA decision unit.
The work in ICB consists of evaluations of control systems and plant electrical systems.
Objectives of the work are to develop acceptable and easily followed methods to perform systematic review, to develop criteria for establishing relative importance to safety (safety significance criteria),
and to develop techniques that can be used in licensing.
The intension is to investigate four operating plants (one from each vendor), the first of which is Oconee 1.
4.
R. Bernero of the Division of Risk Analysis (DRA) summarized the proposed FY83 budget for the SARA decision unit which had been cut by OMB.
Within the various line items, the allocation of funds reflected the DRA assessment of priorities.
However, the total s for the line items were specified by OMG.
Resolving the priorities crosses division lines, since not all of the SARA work I
is done by DRA, and thus the numbers were not firm.
l l
5.
J. Malara of the Transportation and Materials Branch described the work l
in the SARA decision unit for which his branch was responsible.
This work had taken a major cut particularly in the area of transportation risk.
LWR fuel LMFBR fuel cycle risk' assessment was to be funded at $.7 Million in FY 1983.
cycle risk was not to be funded.
The proposed transportation budget was $.5 Million with work in standards development and emergency response as well as a study to determine the adequacy of equipment qualification tests by modal
RELIABILITY AND PROBABILISTIC ASSESSMENT MEETING MINUTES January 26, 1982 comparison with the expecte,d types of equipment loads and environments in plau-sible accidents. Materials work was to include risk analysis of radioactive material distribution and use and of the recycle of contaminated material, and some standards development.
The funding for FY 1983 was to be $3 Million.
6.
F. Rowsome described the qualification changes in the Risk Methodology and Data Branch (RMDB) programs for FY' 1982.
Additions will be in the areas of increased support for NREP to develop guidance for licensees, work on improved system reliability analysis methods including sneak circuit and aerospace techniques, and work on initiating event data analysis.
There is to be a reduc-tion in component data analysis, in statistical methods and software developments, in flood probability work, and in training. There would be a reorientation toward l
work on safety goals and decision theory to evaluate and implement trial use commission goal s, and toward evaluation of limiting conditions of operation (LC0's) by looking at real plants and configurations and detennining if LCO's l
exist when needed and if some LCO's should be tightened or relaxed. The proposed i
l FY 1983 budget total for RMDB was $4.9 Million.
Rowsome also described the effects of the budget cuts and the general considera-tions used to allocate the reduced funds. The work in improved system reliability l
l analysis methods is partially motivated by concern over systematic blind spots in current surveillance techniques.'
The flood probability work was cancelled because it was felt that the work would not be able to significantly reduce the uncertainties.
I RELIABILITY AND PROBABILISTIC ASSESSMENT MEETING MINUTES January 26, 1982 7.
G. Tomlin described the proposed research program of the Regulatory Analysis Branch for FY 1983 which included work to develop tool s for estimating the present worth of losses in an accident, efforts to ascertain the risk limitation effectiveness of general design criteria (GDC), regulatory guides (RG's) and portions of the standard review plan (SRP), and work on regulatory analysis. The latter work was to study regulatory structure and interdependence, the effective-ness of regulatory implementation, and alternative regulatory fonnulations.
The program to review foreign regulatory requirements was eliminated and the programs on the risk limitation effectiveness of current GDC, RG's, and the SRR, and on regulatory analysis were severely cut. The total proposed in FY 1983 budget for l
the Regulatory Analysis Branch was $1 Million.
8.
G. Burdick described the proposed budget for the Reactor Risk Branch and highlighted the effects of the budget cuts. The budget provides for MARCH-2/MELCOR code devel opment to improve the capabilities of the physical processes and consequence modeling techniques, reliability assurance work for continuous and effective safety management, continuation of IREP, an accident sequence precursor program to gain insightes from LER data, support for NRR in the resolution of the pressurized thermal shock issues, comDietion of the program to analyse hazards to nuclear power plants from the transport of chemicals, research to provide so'un'd analytical bases for regulatory requirements for accident prevention and mitigation and finally the program includes work on accident sequence evaluation that is intended to gain insight from the examination of dominant accident sequences from the PRA's that have been performed to date.
This last
I RELIABILITY AND PROBABILISTIC ASSESSMENT MEETING MINUTES 6-January 26, 1982 program is expected to provide a better list of challenges to safety systems.
The total proposed funding for the Reactor Rf sk Branch in FY 1983 is $7.5 Million.
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A TRANSCRIPT IS ON FILE FOR THE DISCUSSIONS WITH NRR STAFF AT THE FIRST PART OF THE MEETING.
THE HANDOUT PROVIDED BY THE VARIOUS SPEAKERS ARE ALSO ON FILE.
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'.v-1/4/82 ATTACHMENT A 1
Preliminary Presentation Schedule for the January 5,1982 Meeting of the ACRS Subcommittee on Reliability and Probabilistic Assessment Washington, D.C.
Speaker Time Opening Remarks D. Okrent 6:00 pm NRR PRA Technical Assistance Program A. Thadani 6:05 pm NRR Flood Research Needs G. Lear /
6:15 pm M. Fliegel Safety Impacts of Control Systems D. Basdekas 6:20 pm Overview of the Proposed Systems and R. Bernero 6:30 pm Reliability Assessment Decision Unit Budget for FY 1983 Transportation and Materials Branch J. Malero 7:00 pm Risk Methodology and Data Branch F. Rowsome 7:15 pm Regulatory Analysis Branch G. Tomlin 8:00 pm Reactor Risk Branch G. Burdick 8:10 pm
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