ML19331D962
| ML19331D962 | |
| Person / Time | |
|---|---|
| Site: | University of Missouri-Columbia |
| Issue date: | 06/20/1975 |
| From: | Alger D, Julian C MISSOURI, UNIV. OF, COLUMBIA, MO |
| To: | |
| Shared Package | |
| ML19331D961 | List: |
| References | |
| NUDOCS 8009040419 | |
| Download: ML19331D962 (6) | |
Text
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ENCLO'SURE 1
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NIVERSITY OF MISSOURI Research Park Columbia. %ssouri 65201 Telephone (314) 882-4211 June 20, 1975 Directorate of Licensing U. S. Nuclear Regulatory' Commission Washington, D. C.
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Subject:
Equipment Deficiency, Schrader Type 972S Series Three-way Solenoid Valve
Reference:
Docket 50-186 University of Missouri Research Reactor Facility License R-lG3 Descriction of Deficiency Because of the past failure of some air operated valves controlled by Schradar type 972S series three-way solenoid talves, an investigation was carried out by the reactor staff.
As a restit of the inrestigation it was suspected that the above three-way sciencid valve could fail if the lower seal separated from the me:al insert and thereby prevented air' from being air.austed through the exhaust port when the solenoid was deenergized (see enclosed d,rawing).
A valve suspected of having so failed was sent to the manufacturer, Scovill Fluid Fcwer Division, Uake Forest, North Carolina, on March 13, j
1975.
The manufacturer replied on May 13, 1975 that as a result of their testing they concluded that the valve did fail as described above.
They recommended that the problem be corrected by bonding the rubber seals to the brass insert using Loctite adhesive 300 series.
As reported to the Commission on July 19, 1971, valve 507B failed to shut.
It is now believed this failure was due to the above deficiency.
Also on October 1,197 3, it was reported to the Commission that valve 547 failed to open and is now believed to have failed for the same reason.
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F Directorate of Licensing June 20, 1975 Corrective Action A modification package has been prepared to replace the seals in each Schrader type 972S three-way solenoid valve.
After a favorable review by the MURR Safety Subcommittee, the seals will be replaced with ones bonded as recommended by the manufacturer.
Sincerely, 0
t Caudle A. Julian Reactor Manager i
Endorsement Q
Reviewec and Approvec, Don M.
Alger Associate Director kp cc: Directorate of Regulatory Operations--Region III Robert M. Brugger, Director t
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ENCLOSURE 2 J
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UNIVERSITY OF MISSOURI Research Park Colurnbia, Missouri 65201 Telephone (314) 882-4211
. March 13, 1975 Mr. Hubert Jenks Scovill Fluid Power Division Route 3 Wake Forest, NC 27587
Dear Mr. Jenks:
Enclosed is the 972S series three-way_ solenoid valve that failed in service as we discussed in our phone conversation on March 11, 197S.
This valve is used to control an actuator (drawing enclosed) that cperates ' a six-inch butte ~:, valve. Tne working fluid is 100 psig dry
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air.
When the solenoid is de-energized, the three-way valve shuts off the air that h:'_is the actua:: spring cc pressed and vents through the bottom vent port te allev the sp-ing to rotate the actuator.
s On this Mzr h 7, the sciencid was de-energized but the actuator piston did not coc-lete its travel.
It appeared that the three-way valve did cperate but -he lower sea'. separated from the metal insert and prevented the actuater fr:a venting. Tnis failure can be duplicated by loosening the nut that holds the insert. Howeve'r, the nut on the above valve was snug.. D.is valve was cycled several times and failed on about.60% of the tries.
We have in our plant about twenty-five 972S series' three-way valves' in
'similar service. Over the last five years we have experienced four other failures similar to the one above. We would appreciate your assistance in a solution of this problem. We will cooperate in any way in'this matter.
Sincerely, Richard Werner Plant Engineer kp Attachment
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ENCLOSURE 3 Fluid PowerDivision May 13, 1975 s
Mr. Rich'ard Werner University of Missouri Research Reactor Facility Research Park Cdlumbia, Missouri 65201
Dear Mr. Werner:
I would like to apologize for the long delay in answering your letter of March 13, 1975.
After testing the sample valve you returned, we were able to simulate the same problem you have been experiencing.
The easiest way ts correct this is to use Loctite adhesive 300 series (see attacled) c bond the rubber seals to the brass insert.
Sincerely, s.b Nubert J. ' s Asst. Product Manager dl Attachment t
U.S. Route No.1, W;ka Forest, NC 27537 ENCLOSURE 4 (919) 556-4031 Schrader Bellows Division August 21, 1980 Fluid Power Group Mr. Walter Meyer University of Missouri Research Reactor Room 302 University of Missouri Columbia, Missouri 65201
Dear Mr. Meyer:
By this time you should have received the smaller seals for the 972S valve and should ce experiencing no problems.
I promised you that I would give you more information that, in the future, would prevent you from getting tne wrong items.
With that in mind we have assigned two new part numbers.
The first is for a seal kit which contains the smaller seal that your application requires. This is our part number 972-9005 which you should order when you desire to rebuild a valve.,
The second new part number is for a complete valve. This is our part number 972-9004 When you need an entirely new valve, with the small lower seal, you shculd order this part.
I hope the above is helpful and prevents any further misunderstand 1ngs.
Sincerely, W
Paul R. Browne Product Reliability Assurance Manager jv
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