ML20002C232
| ML20002C232 | |
| Person / Time | |
|---|---|
| Issue date: | 12/02/1980 |
| From: | Advisory Committee on Reactor Safeguards |
| To: | Advisory Committee on Reactor Safeguards |
| References | |
| ACRS-1797, NUDOCS 8101090716 | |
| Download: ML20002C232 (4) | |
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SUMMARY
/ MINUTES OF LER SUBCOMMITTEE MEETING 9
NOVEMBER 20, 1980 WASHINGTON, D.C.
ye PURPOSE: 70 discuss the recent experience of the NRC Office for Analysis and evaluation of Operational Data in its evaluation of operating events and collection and sorting of data.
ATTENDEES:
ACRS NRC o
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C. Michelson S. Lawroski J. Heltemes J. Ray F. Hebdon I. Catton Z. Zudans W. Lipinski A. Bates
- MEETING REVIEW:
C. Michelson, AE0D, briefly summarized the responsibilities of his Office 1.
in evaluating operational data and in coordination of activities with other NRC Offices (NRR, IE, Research, NMSS, OSD, MPA) having responsibilities for collectiona and evaluation of Operational Data.
At the present time all current LERs are being screened.
Work is underway to develop some computer searching routines for data.
2.
J. Heltemes, AE0D, discussed the scope of the AE0D activities, its organi-activities and conduct of Technical Studies.
zation and staffing, program AE0D Staff can contact any NRC personnel and utility people needed for review of events, Activities include revision of reporting requirements, development of coding of event sequences, and improvements in t,te retrievability and use of foreign data.
- Designated Federal Employee 8 7 0109 0 tm>
. November 20, 1980 LER Subcommittee The data evaluation process follows two paths.
Events are reviewed initially to determine their significance.
Those thought important are selected for case studies and evaluations.
In a second monitoring process all events are sequence coded for computer retrieval and searches for precursor events and Thus AE00 hopes to catch both events of immediate importance and data trends.
those wita mo-e subtle significance which could have more serious consequences under slightly different circumstances.
S. Ruben, AE0D, reviewed their investigation of the Browns Ferry-3 partial 3.
The event investigation included site visitation and discus-scram failure.
sions with other NRC and utility personr.el to collect data.
The product of the investigation was a report making a number of recommendations and findings on needed modifications to the drain and venting of the SDV/S;/, the level
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instrumentation in the SIV, and the control air system / scram system interac-AE00 is also following up on their recommendations to see tion potential.
,what action NRR takes.
W. Lanning, AE00, reviewed their study of the ANO loss of offsite power 4.
The review again obtained data from a site visit and event on April 7, 1980.
discussion with the utility and IE.
A number of recommendations and findings Findings include a lack of natural circulation criteria for have been made.
plant operators, improper emergency feedwater alignment, and possible unavail-ability on the Unit 2 turbine drive EFW train.
Arkansas Power and light indicated that they have found a number of items that AEOD indicated that they are they believe to be errors in the AE00 report.
willing to discuss their report with any interested party in order to resolve any difficulties.
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1 LER Subcommittee November 20, 1980
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A number of problems have been identified with the use of che present LER
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system in searching for specific types of events.
Information is of ten coded
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4 under equipment codes which are secondary to the items of interest.
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6.
AE0D helped provide peer review of the IREP study of the Crystal River k
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Plant.
This review identified a numer of problems which were found from
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operational data available on Crystal River.
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AE0D has found that they need to have a data base that describes an entire
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event in a sequential way with all interactions described..This information needs to be computer retrievable so that search routines can be used to find similar component f ailures.
To resolve this need ORNL's NSIC staff has been working for AE00 to develop computer software to encode and retrieve opera-tional data sequences.
This program uses a sequential listing of event occurrences encoded so that a computer routine can retrieve particular events, component failures, or failure sequences.
8.
AE00 is working with other NRC Offices in an attempt to revise the NRC l
reporting requirements. This present system includes the LER system which is I
mandatory and the NPRDS system which is a voluntary system. A paper has gone to the Commission (SECY CO-507) which would integrate the LER and NPRDS system into one system which would require reporting of significant events to the NRC and less significant events and failure type data to NPRDS.
Component failures would be reported on single forms to NPRDS.
The technical content and import.ance of LERs would be improved and the number reduced. This propo-sal would go forward through rulemaking and become mandatory.
The proposed rule would go out in June 1981 and become final in the spring of 1982.
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, November 20, 1980 LER Subcommittee Additional details are available in the meeting transcript on file in the NRC Public Document Room, 1717 H St.,
N.W., Washington, D.C. or from Alderson Reporting, Inc., 400 Virginia Ave, S.W., Washington, D.C.
A complete set of all slides used are on file in the ACRS Office with the record copy of the minutes.
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