ML20203G332
| ML20203G332 | |
| Person / Time | |
|---|---|
| Issue date: | 07/28/1986 |
| From: | Rosenthal J NRC OFFICE OF INSPECTION & ENFORCEMENT (IE) |
| To: | Doyon J ITT BARTON |
| References | |
| NUDOCS 8608010082 | |
| Download: ML20203G332 (3) | |
Text
s .
JUL 2 81986 -
Mr. John P. Doyon
- ITT Barton 900 South Turnbull Canyon Road City of Industry, CA 91749 '
Dear Mr. Doyon:
SUBJECT:
IE DRAFT INFORMATION NOTICE: MALFUNCTIONS OF ITT BARTON MODEL 580 SERIES SWITCHES DURING REQUALIFICATION TESTING The draft IE information notice is enclosed for your review per the recent telephone conversation between you and Eric Weiss of my staff. If you have any comments, please send them to me as soon as possible but not later than 7 days from the date of this letter because we expect to issue the notice soon.
If you have any questions regarding this matter, please feel free to contact me or Mr. Weiss. I can be reached at (301) 492-4193 and Mr. Weiss at (301) 492-9005.
Sincerely, W 'liF#W3 DJ Jack E. Rosenthal, Chief Events Analysis Branch Division of Emergency Preparedness and Engineering Response Office of Inspection and Enforcement
Enclosure:
IE draft information notice Dist bution:
L DEPER R/F EAB R/F EWeiss SASchwartz ELJordan RWStarostecki DAllison JRosenthal GFlanik n .
EKeiss:ew JR senthal 7h #86 7f 86 l l
8606010082 860728 PDR I t<E MISC PDR
INS No.: 6835 UNITED STATES NUCLEAR #EGULATORY COMMISSION OFFICE OF INSPECTION AND ENFORCEMENT WASHINGTON, D.C. 20555 July , 1986 IE INFORMATION NOTICE NO. 86- : MALFUNCTIONS OF ITT BARTON MODEL 580 SERIES SWITCHES DURING REQUALIFICATION TESTING Addressees:
All nuclear power reactor facilities holding an operating license or a construction permit.
Purpose:
This notice is provided to alert recipients to a potentially significant safety problem pertaining to malfunctions of ITT Barton Model 580 Series indicating switches under accident conditions. It is expected that recipients will review the information for applicability to their facilities and consider actions, if appropriate, to preclude malfunctions occurring at their facilities. However, suggestions contained in this notice do not constitute NRC requirements; therefore, no specific action or written response is required.
Description of Problem:
e On April 14, 1986, NRC was notified by ITT Barton Instruments Company of the defect in accordance with 10 CFR Part 21. According to the report, during requalification testing of ITT Barton Model 580 Series indicating switches under loss-of-coolant accident conditions, switch malfunctions occurred when the chamber temperature was raised to 340 F. The symptoms of the malfunctions were:
In three of the five instruments tested, one or both of the switches failed to operate (no change in switch state) when input pressure to 4
the instrument was varied.
Switch set point shift in excess of the allowable 10 percent occurred on two of the instruments.
When the chamber temperature was lowered to room ambient, all of the switches changed state when input pressure was varied; however, the switch set point shifts which occurred at temperature were permanent.
The initial report indicated that the failure was due to a specific component used, a Honeywell Snap-Acting Switch, part number 11SM 403. A subsequent report indicated that, as a result of additional testing, it was determined that there is also a deflection of the instrument case which affects the position of the snap switch and the setpoint. Furthermore, the deflection can result in failure of case seal integrity.
~
IN 86-p,yp T , 19es Page 2 of 2 ITT Barton has indicated that is is evaluating case / seal redesigns and a realistic date for completion of retesting would be April 15, 1987.
In previous tests, the instruments performed successfully when subjected to 220 F efter aging, irradiation, and seismic testing.
This information notice is being issued to ensure that all nuclear power plant end-users have been notified of this problem.
John P. Doyon Manager, Sales and Service (818) 961-2547 extension 456 No specific action or written response is required by this information notice.
If you have any questions about this matter, please contact the Regional Administrator of the appropriate regional office or this office.
/VOf (lhWhh Edward L. Jordan, Director Division of Emergency Preparedness and Engineering Response Office of Inspection and Enforcement Technical Contacts: Eric Weiss, IE (301) 492-9005 Pentti Koutaniemi, IE (301) 492-9428 Attachments: List of Recently Issued IE Information Notices f
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