ML20083J918
| ML20083J918 | |
| Person / Time | |
|---|---|
| Site: | Bellefonte  |
| Issue date: | 12/28/1983 |
| From: | Mills L TENNESSEE VALLEY AUTHORITY |
| To: | James O'Reilly NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II) |
| References | |
| 10CFR-050.55E, 10CFR-50.55E, NCR-2551, NRC-2551, NUDOCS 8401050494 | |
| Download: ML20083J918 (2) | |
Text
.
TENNESSEE-VALLEY AUTHORITY
!P bHATTANOObA TENNESSEE 374o1 I
'400 Chestnut Street Tower II p Q *, 3 $
December 28, 1983 d 3..
BLRD-50-438/83-63 BLRD-50-439/83-57 U.S. Nuclear Regulatory Commission Region II Attn:
Mr. James P. O'Reilly, Regional Administrator 101 Marietta Street, Suite 3100 Atlanta, Georgia 30303
Dear Mr. O'Reilly:
BELLEFONTE NUCLEAR PLANT UNITS 1 AND 2 - ORIENTATION OF ASCO SOLEN 0ID -
OPERATED VALVES - BLRD-50-438/83-63, BLRD-50-439/83 FIRST INTERIM REPORT The subject deficiency was initially reported to NRC-0IE Inspector Linda Watson on November 30, 1983 in accordance with 10 CFR 50.55(e) as NCR 2551. Enclosed is our first interim report. We expect to submit our next report by October 19, 1984.
If you have any questions concerning this matter, please get in touch with
' R. H. Shell at FTS 858-2688.
Very truly yours, TENNESSEE VALLEY AUTHORITY L. M. Mills, Manager Nuclear Licensing Enclosure oc:
Mr. Richard C. DeYoung, Director (Enclosure)
Office of Inspection and Enforcement U.S. Nuclear Regulatory Commission Washington, D.C.
20555 Records Center (Enclosure)
Institute of Nuclear Power Operations 1100 Circle 75 Parkway, Suite 1500 Atlanta, Georgia 30339 8401050494 831228 PDR ADOCK 05000438
, p,pgp gg PDR S
M 1.')
1983-TVA 5OTH ANNIVERSARY
\\
An Equal Opportunity Employer
ENCLOSURE BELLEFONTE NUCLEAR PLANT UNITS 1 AND 2 ORIENTATION OF ASCO SOLENOID-0PERATED VALVES NCR 2551 10 CFR 50.55(e) REPORT BLRD-50-438/83-63, BLRD 50-439/83-57 FIRST INTERIM REPORT Description of Deficiency Pilot sclenoid valves are used in the air line to a pneumatic control valve air diaphragm for the purpose of relieving the pressure on the diaphragm to allow a spring to force the control valve to its failure mode.
The solenoids are normally mounted on the control valve by the control valve manufacturer. Certain solenoid models manufactured by the Automatic Switch Company (ASCO) require a specific mounting orientation to assure correct operation. Several valves were found installed at Bellefonte with the solenoids not oriented in the required position. Specifically, the control valve manufacturer (Copes Vulcan, Incorporated) had assumed the control valve would be installed in the piping with its diaphragm actuator vertical and oriented the solenoid for this installation. Unfortunately, due to surrnund3ng hardware interferences, some of the control valves could not be installed with their actuators vertical but instead were installed with the Lotuators horizontal. As a consequence, the solenoids are not oriented to permit proper operation.
Interim Progress TVA considers that this problem is potentially generic to other safety-related valves furnished by other manufacturers to TVA at Bellefonte.
Therefore, the first step to be taken will be a review of all safety-related pneumatic control valves with pilot solenoids to determine which control valves have ASCO solenoid models with orientation limitations. The second step will be to compare the manufacturer's control valve drawings with the mechanical piping drawings (which show valve orientation) to determine which control valves (and hence the solenoids) are oriented in an unacceptable manner. The final step will be correction of the problem areas by either designing a solenoid mounting bracket that will orient the solenoid in the correct position with the control valve left installed as is or by rotating the control valve in relation to the piping to place the solenoid back in an acceptable position. An Engineering Change Notice will be prepared to revise all appropriate drawings once the review is complete and all unacceptable installations identified.
__