ML20207Q463

Requests Review & Comments on Air Sys Problems at Us Lwrs. Comments Due within 30 Days of Receipt of Rept

ML20207Q463
Person / Time
Issue date:	12/11/1986
From:	Heltemes C NRC OFFICE FOR ANALYSIS & EVALUATION OF OPERATIONAL DATA (AEOD)
To:	Beckjord E, Harold Denton, Taylor J NRC OFFICE OF INSPECTION & ENFORCEMENT (IE), Office of Nuclear Reactor Regulation, NRC OFFICE OF NUCLEAR REGULATORY RESEARCH (RES)
References
NUDOCS 8701270370
Download: ML20207Q463 (3)

Text

December 11, 1986 o

MEMORANDUM FCR: Harold R. Denton, Director Office of Nuclear Reactor Regulation James M. Taylor, Director Office of Inspection and Enforcement Eric S. Beckjord, Director Office of Nuclear Reactor Research Thomas E. Murley, Regional Administrator, Region I J. Nelson Grace, Regional Administrator, Region II James G. Keppler, Regional Administrator, Region III Robert D. Martin, Regional Administrator, Region IV John B. Martin, Regional Administrator, Region V FROM:

C. J. Heltemes, Jr., Director Office for Analysis and Evaluation of Operational Data

SUBJECT:

REQUEST FOR PEER REVIEW COMMENTS - PRELIMINARY CASE STUDY REPORT ON AIR SYSTEMS PROBLEMS AT U.S. LIGHT WATER REACTORS A preliminary AE00 case study report on " Air Systems Problems at U.S. Light Water Reactors" is enclosed. The study analyzes and evaluates the operational experience related to, and the safety implications associated with failures and degradations of air systems at U.S. LWRs.

The report presents aspects of air systems degradations and plant responses to air systems losses which are not addressed in previous studies.

It also highlights more than two dozen events in which, contrary to licensing assumptions, a safety-related system failed due to an air system degradation or failure.

Operating events involving the loss or degradation of air systems were judged to be safety significant because they may lead, under different circumstances, to potentially serious events and conditions which have not ueen analyzed in the FSARs.

The report presents five recommendations which, if implemented, should reduce reactor accident risks by reducing the likelihood for common mode failure of safety systems and by enhancing plant recovery from anticipated and unanticipated transients.

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Multiple Addressees 2-In accordance with our " peer review" process, prior to the finalization and distribution of our case study reports, we are providing NRR, IE, Regional Offices, RES, NSAC and INP0 with a copy of a preliminary report for review and comment. We request that you focus your review primarily on the accuracy and completeness of the technical details (i.e., comments are being solicited on the technical accuracy of the report). The findings, conclusions, and

. recommendations are provided for your information in order that you may understand the significance AE0D places on these events and, therefore, obtain a more complete picture of the total report. Changes to the findings, conclusions, and recommendations will be considered L.ly if the underlying information concerning the details of plant design or systems operation is in error. We would welcome comments either informally by telephone or formally by memorandum.

Since we wish to finalize and issue the report shortly, we ask that any comments be received by us within 30 days from receipt of this preliminary report. Should your office require additional time beyond that point, please let us know; otherwise, it will be assumed that you have no comments.

A copy of the preliminary report and this memorandum, are being placed in the Public Document Room at 1717 H Street, N.W., Washington, D.C. 20555.

If you or your staff have any questions regarding this study, please feel free to contact me or Dr. Hal Ornstein at 492-4439.

C. J. Heltemes, Jr., Director Office for Analysis and Evaluation of Operational Data

Enclosure:

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DISTRIBUTION:

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V. Stello, EDO J. Sniezek, DEDROGR-G. Holahan, NRR F. Miraglia, NRR R. Bernero, NRR T. Speis, NRR W. Russell, NRR D. Crutchfield, NRR J. Calvo, NRR R. Jones, NRR-R. Kendall, NRR K. Kniel, NRR W. Long, NRR L. Marsh, NRR D. Mcdonald, NRR W. Milstead, NRR W. Minners, NRR J. Norris, NRR J. Page, NRR H. Pastis, NRR W. Paulson, NRR A. Rubin, NRR H. Silver, NRR N. Wagner, NRR B. Grimes, IE J. Partlow, IE E. Jordan, IE R. Baer,-IE D. Brewer, RII J. Bryant, RII R. Butcher, RII J. Callan, IE B. Debbs, RII D. Dubois, RIV S. Elrod, RII D. Falconer, RI!

V. Hodge, IE R. Huey, RV R. Jacobs, RI W. Johnson RIV P. Krug, RII L. McGregor, RIII L. Miller, RV W. Orders, RII T. Peebles, RII G. Perez, RV K. Raglin, IE J. Rosenthal, IE L. Rossbach, RI W. Roland, RII K. Saster, RII R. Singh,-IE P. Swetland, RI E. Trottier, IE R. Woodruff IE J. Wiebe, RIII G. Burdick, RES