ML20215E685
| ML20215E685 | |
| Person / Time | |
|---|---|
| Issue date: | 12/05/1986 |
| From: | Heltemes C NRC OFFICE FOR ANALYSIS & EVALUATION OF OPERATIONAL DATA (AEOD) |
| To: | Layman W NUCLEAR SAFETY ANALYSIS CENTER |
| Shared Package | |
| ML20215E592 | List: |
| References | |
| NUDOCS 8612230071 | |
| Download: ML20215E685 (3) | |
Text
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. December 5, 1986 5
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Mr. William Layman, Acting Director L
Nuclear Safety Analysis Center f
3412 Hillview Avenue L-P. O. Box 10412 AE0D/C603
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L Palo Alto, California 94303 g
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Dear Mr. Layman:
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SUBJECT:
CASE STUDY REPORT - A REVIEW 0F MOTOR-0PERATED VALVE PERFORMANCE
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The Office for Analysis and Evaluation of Operational Data (AE0D) has finalized its case study on a review of motor-operated valve performance. The i
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final report addresses the peer review comments provided by NRR, IE, RES, the b
Regions, INP0, NSAC, M0 VATS Inc., and Toledo Edison Company. The study report brings together previous NRC studies and other related documents (i.e., AE00 g
7 reports and IE bulletins, circulars, and information notices), reviews p.
approximately 1200 valve operator events (SCSS and NPRDS) from 1981 to mid-1985, e
and incorporates new data from an NRC valve testing program that utilized r
I-signature tracing techniques on valve assemblies in operating plants. We have enclosed a copy of our final report for your information and use as you may
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deem appropriate.
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E This study was performed in response to action item 6(i) of the actions i
directed by the Executive Director for Operations to respond to the NRC staff investigations of the June 9, 1985 event at Davis-Besse.
Our case study p
report concludes that current methods and procedures at many operating plants y
are not adequate to assure that valves will operate when needed.
Furthermore, j
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the deficiencies would generally not be detected by existing plant procedures p
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specifications and ASME Code,Section XI inservice testing)g (plant technical intended to assure operability, such as surveillance testin 1
or plant operator b
observations. Thus, assurance of valve operability appears to be strongly
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dependent upon diagnostic capability to assess and evaluate failures to operate so that root causes of failure--including switch setpoint--are
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correctly determined and proper changes implemented.
Further, the issue of q
valve assembly performance and reliability is a complex subject that involves 9
r several technical disciplines.
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The enclosed case study report contains several specific recommendations E
directed toward addressing valve assembly performance and reliability p
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problems. We understand that the NRC Executive Director for Operations will
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L request that NUMARC undertake appropriate industry initiatives to address the problems identified in the AE0D report.
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E B612230071 861205
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PDR ORG TEXD I
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Mr. William Layman- '
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A copy of the final case study report and this letter 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 report, please contact Earl J. Brown of my staff. Dr. Brown can be reached at (301) 492-4437.
Sincerely, orenes senes my C. J. Hasteenes. A.
C. J. Heltemes, Jr., Director Office for Analysis and Evaluation of Operational Data
Enclosure:
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- 12/q(/86 OFFICIAL RECORD COPY
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Mr. William Layman A copy of the final case study report and this letter 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 report, please contact Earl J. Brown of my staff.
Dr. Brown can be reached at (301) 492-4437.
C. J. Heltemes, Jr., Dif ctor Office for Analysis apd Evaluation of Operational Da
Enclosure:
As stated DISTRIBUTION:
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- CHeltemes DATE:12/'//86
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