ML20237J040
| ML20237J040 | |
| Person / Time | |
|---|---|
| Issue date: | 08/19/1987 |
| From: | Berlinger C Office of Nuclear Reactor Regulation |
| To: | Hammond J LOCTITE CORP. |
| References | |
| IEIN-84-53, NUDOCS 8708250274 | |
| Download: ML20237J040 (3) | |
Text
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AUG ]9 37 Mr. John Hammond, Manager, Technical Services and Development Lectite Corporation 705 North Mountain Road Newington,. Connecticut 06111 Gentlemen:
The' Nuclear' Regulatory Commission is in the process of preparing an information.
notice entitled "Information Concerning the Use of Anaerobic Adhesive /
Sealants." ,
A copy of the latest draft of this information notice is enclosed for your review and comment.
Comments, particularly those dealing with the facts presented in the informa-tion notice, received by September 4, 1987 will be considered in the final version.
Sincerely, Carl H. Berlinger, Chief Generic Communications Branch Division of Operational Events Assessment' Office of Nuclear Reactor Regulation' ;
Enclosure:
Draft NRC Information Notice No. 87-XX DISTRIBUTION j CERossi, NRR CHBerlinger, NRR l RJKiessel..NRR i EJButchE.r, NRR WDLanning,-NRR i
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1 SSINS No.: 6835 '
IN 87-XX I
UNITED STATES NUCLEAR REGULATORY COMMISSION OFFICE OF NUCLEAR REACTOR REGULATION ,
WASHINGTON, D.C. 20555 August XX, 1987 NRC INFORMATION NOTICE N0. 87-XX: INFORMATION CONCERNING THE USE 0F ANAEROBIC ADHESIVE / SEALANT 5 Addressees:
All nuclear power reactor facilities holding an operating license (0L) or a construction permit (CP). .
1
Purpose:
^
This information notice is provided to alert recipients to a potentially l significant safety problem pertaining to the use of anaerobic adhesives and sealants. It is expected that recipients will review the information for applicability to their facilities and consider actions, if appropriate, to preclude a similar problem. However, suggestions contained in this notice do. j not constitute NRC requirements; therefore, no specific action or written response is required.
Description of Circumstances:
On July 1,1987, Carolina Power and light Company (CP&L) reported that follow-ing a reactor trip / turbine trip at Brunswick Steam Electric Plant, Unit 1, (Brunswick) one safety relief valve (SRV) failed to open when manually actuated
, for pressure control. The SRV is part of the automatic depressurization system t
(ADS) at that plant. Subsequent testing on July 3rd of other ADS valves resulted in a second valve failing to open on rnanual actuation. During post failure examination it was determined, that during maintenance, Loctite was used to help seat a locknut in the solenoid assembly and this material migrated to the solenoid clearance around the plunger prior to setting. In this in-stance, the material was Loctite RC 620. The valves at Brunswick were recently i
' rebuilt by Target Rock Corporation at Wyle Laboratory. At Brunswick, the failures were discovered shortly after the valves were ir: stalled and after containment was inerted.
Discussion:
This event is similar to that described in Information Notice 84-53, "Informa-tion Concerning the Use of Loctite 242 and Other Anaerobic Adhesive / Sealants." !
In that event, Loctite 242 Threadlocking Adhesive / Sealant was used in the assembly of scram pilot solenoid valves. An investigation into the failure of several scram solenoid valves revealed the cause to be the failure of mainte-nance technicians to wipe excess Loctite from the assembly which resulted in the bonding of the solenoid core plunger to the base assembly.
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IN 87-XX
- August xx, 1987 Page 2 of 2 d
The Brunswick SRVs also failed because excess Loctite was not cleaned by the contractor technician from the plunger assembly. In this latter case Loctite RC 620 was used. This substance is anaerobic (cures in the absence of air).
Thus, the plunger did not become seized until after the valves with excess Lottite were placed in the inerted atmosphere which exists in the reactor containment when the reactor is brought to power conditions.
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.
Charles E. Rossi, Director Division of Operational Events Assessment Office of Nuclear Reactor Regulation
~
Technical'
Contact:
Ray Scholl, NRR (301)492-8213 i
Attachment:
List of Recently Issued Information Notices I
a, l
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