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
. _ . . . . . . . . .. ._ _ _. . . , . . . . _ . . . . . . - --
w y . December 5, 1986
~
5 Mr. William Layman, Acting Director L Nuclear Safety Analysis Center f 3412 Hillview Avenue ^
L- P. O. Box 10412 AE0D/C603 L Palo Alto, California 94303 g x s
Dear Mr. Layman:
%R f
SUBJECT:
CASE STUDY REPORT - A REVIEW 0F MOTOR-0PERATED VALVE PERFORMANCE -
[ The Office for Analysis and Evaluation of Operational Data (AE0D) has -
i finalized its case study on a review of motor-operated valve performance. The -
[ 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 :
7 brings together previous NRC studies and other related documents (i.e., AE00 reports and IE bulletins, circulars, and information notices), reviews g
- p. approximately 1200 valve operator events (SCSS and NPRDS) from 1981 to mid-1985, e r
and incorporates new data from an NRC valve testing program that utilized .
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 {
deem appropriate.
- l c
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, z
p
[ the deficiencies would generally not be detected by existing plant procedures j intended to assure operability, such as surveillance testin 1
) specifications and ASME Code,Section XI inservice testing)g or plant (plant operator technical b observations. Thus, assurance of valve operability appears to be strongly -
[ dependent upon diagnostic capability to assess and evaluate failures to operate so that root causes of failure--including switch setpoint--are (r correctly determined and proper changes implemented. Further, the issue of q valve assembly performance and reliability is a complex subject that involves 9
- several technical disciplines.
T F The enclosed case study report contains several specific recommendations E directed toward addressing valve assembly performance and reliability p
? problems. We understand that the NRC Executive Director for Operations will =
L request that NUMARC undertake appropriate industry initiatives to address the problems identified in the AE0D report.
je i
l J 5
E B612230071 861205 TEXD I PDR ORG E
tg .s a 'e h
Mr. William Layman-x c 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:
As stated AE00 SF AE0D CF ROAB SF ROAB CF EBrown MChiramal SRubin WLanning KBlack MWilliams FHebdon CHeltemes DHumenansky, OCM
- See r. ext sheet for previous concurrence OFC :ROAB :ROAB:SC :ROAB:BC :AEOD DD :AE00:D : :
.____: .._________:____________:_...._______:___ , __....:. .qr....__:___..______:_..________
NAME :EBrown:nc :MChiramal :SRubin :FHeb on :C ,
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DATE :12/ 4 /86 * :12/ 4 /86 * :12/ 4 /86 * :12/5'/86 :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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