ML20052G567
| ML20052G567 | |
| Person / Time | |
|---|---|
| Site: | Perry, Catawba, Harris, Grand Gulf, River Bend, Vogtle, San Onofre, Comanche Peak, Midland, Bellefonte, 05000000, Washington Public Power Supply System, Shoreham, Hartsville, Phipps Bend |
| Issue date: | 05/13/1982 |
| From: | Boyer R TRANSAMERICA DELAVAL, INC. |
| To: | NRC OFFICE OF INSPECTION & ENFORCEMENT (IE) |
| References | |
| REF-PT21-82 NUDOCS 8205180468 | |
| Download: ML20052G567 (2) | |
Text
O QC Transarnenca Delaval Inc.
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P.O. Box 2161 g3 g,g Oakland. Cahforn.a 94621 g
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(415) 577-7400 i
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May 13., 1982
<!4 41 iM Director, Office of Inspection & Enforcement ud U.S. Nuclear Regulatory Commission n
Washington, D.C.
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Dear Sir:
In accordance with the requirements of Title 10, Chapter 1, Code of Federal M
Regulations, Part 21, Transamerica Delaval, Inc., hereby notifies the Commi-ek o.
sion of a potential defect in a component of a DSRV or DSR Standby Diesel uw f Generator. There exists a potential problem with the starting air valve uve assembly which could result in engine non-availability.
vg Transamerica Delaval has supplied the DSR and DSRV engines, with the potential defect, to the following sites:
g,g D1 Long Island Lighting Shoreham 74010/12 f2o Middle South Energy Grand Gulf 74033/36 rai-Gulf States Utilities River Bend 74039/40 5 53 Carolina Power & Light Shearon Harris 74046/49 g
Duke Power Company Catawba 75017/20 Southern California Edison San Onofre 75041/42 Cleveland Electric Illum.
Perry 75051/54 Tennessee Valley Authority Bellefonte 75080/83 Washington Public Power Unit 1 75084/85 Texas Utilities Services Comanche Peak 76001/04 Georgia Power Vogtle 76021/24
' Washington Public Power Unit 4 76031/32
. Consumers Power Midland 77001/04 Tennessee Valley Authority Hartsville/Phipps Bend 77024/35 0nly one of these units has been placed in commercial operation - Southern California Edison, San Onofre. This station has been operating in excess of five years without any failure of the starting air valve assembly reported.
The starting air valve assembly was manufactured and installed in the cylinder head by Transamerica Delaval.
The potential defect is related to the length of the capscrew which holds the starting air valve assembly in the cylinder head.
If this capscrew bottoms in the tapped hole in the cylinder head before the assembly is properly seated, the torque wrench reading would be misleading and the assembly could fail.
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Transame,ica DelavalInc.
"o 008 engine ano como, esso, omision hgl g l 550 85th Avenue P.O. Box 2161 gig Oakland. California 94621 (415) 577-7400 U.S. Nuclear Regulatory Commission May 13, 1982 Page 2 Our review of this potential defect was completed on May 11, 1982.
The starting air valve assembly has been reviewed by Engineering.
If all dimension tolerance is stacked in one direction, the installed clearance is less than desirable. A capscrew,1/4" shorter still gives adequate thread engagement and eliminates any possibility that the capscrew will bottom in the tapped hole. We have changed the capscrew to 2-3/4" length.
1 It is impossible to determine if this problem exists in an installed assembly.
The capscrews which are installed are 3" long. This potential problem can be eliminated by removing the capscrews and cutting 1/4" off and re-installing or by replacing the existing capscrews with a new 2-3/4" long capscrew.
A copy of this letter will be sent to each of the cognizant parties as listed in paragraph 2, no later than June 1,1982. Transamerica Delaval will furnish parts and technical services as required by request and in accordance with each individual contract.
Since the correction of this potential defect depends on action by others, we can not estimate when the action will be completed.
Very truly yours, l
$,f R. E. Boyer, Manager Quality Assurance REB:cjb 1
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