ML20246J442

Forwards Corrected Rev 1 to AEOD/S901, Maint Problems at Nuclear Power Plants, Special Study Rept

ML20246J442
Person / Time
Issue date:	05/09/1989
From:	NRC
To:	NRC
Shared Package
ML19302D909	List: ML20246J381 ML20246J442
References
AEOD-S901, NUDOCS 8905170080
Download: ML20246J442 (1)

Text

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)er s UNITED STATES 5

'I NUCLEAR REGULATORY COMMISSION

%.,,, ,/ wAsHiNoTow, o.c. 20sss MAY 0 9 G89 Attached is a corrected copy of Special Study Report, AE0D/S901, Rev.1,

" Maintenance Problems at Nuclear Power Plants," May 5, 1989. Please discard the previously issued report you received earlier this week.

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p, NUCLEAR REGULATORY COMMISSION WASHINGTON, D. C. 20655

\.....}j MAY 0 51989 MEMORANDUM FOR: Bill Morris, Director Division of Regulatory Applications, RES Charles E. Rossi, Director Division of Operational Assessment, NRR FROM: Thomas N. Novak, Director -- .

Division of Safety Programs, AE0D

SUBJECT:

REVISED AE0D SPECIAL STUDY REPORT AE0D/S901 AE00 special study report AE0D/S901, " Maintenance Preblems at Nuclear Power Plants," was provided to you fnr information by my memnrandum of February 23, 1989. We have revised and expanded the original report to incorporate additional data and analyses, and deleted certain information that, upon

'further review, can be replaced with information that more accurately reflects maintenance effectiveness. The revised report using the additional information presents clearer trends. Thus, the revised report updates and supersedes the previous version. I am enclosing a ecpy of the revised report for your consideration and use.

The revised report includes a review of maintenance-related cause code data extracted from licensee event reports for 1985,1986,1987, and the first two quarters of 1988. Also included is an analysis of data related to maintenance problems from the NRC Performance Indicator (PI) program covering 1987 and 1988. Other data from the PI program related to maintenance, such as average forced outage rate and equipment forced outages, are also presented.

The revised report deletes previously used information from the NRC Nuclear Document System, since the trends in the maintenance related documents in the system most likely resulted from a combination of NRC and industry activities.

Some general conclusions from the expanded data analysis are:

The fraction of events attributable to maintenance deficiencies has remained relatively unchanged since 1985.

- The distribution of causes for events that are included in the PI program is similar to that for all events reported in LERs for the same period.

- Industry performance in the area of maintenance at operating nuclear //

plants is showing a clear improving trend in the latter part of 1987 and in 1988. /y I muroEBRT03CBiiMRS. p 3%n Tl OM6-A jif 513 % PP. *S$$, ~ ms f Y

If you or your staff have any questions regarding the revised report, please contactMatthewChiramal(492-4441) of my staff.

Odginal signed by Thomas N. Novak, Director, Division of Safety Programs, AE0D

Enclosure:

As stated cc w/ enclosure:

L. P11sco, NRR T. Foley, NRR J. Roe, NRR A. Gody, NRR T. King, RES Distribution:

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