ML20237J316

Forwards Draft NRC Info Notice, Info Concerning Use of Anaerobic Adhesive/Sealants, for Review & Comment.Comments Received by 870904 Will Be Considered in Final Version

ML20237J316
Person / Time
Issue date:	08/19/1987
From:	Berlinger C Office of Nuclear Reactor Regulation
To:	Hyten S WYLE LABORATORIES
References
NUDOCS 8708260111
Download: ML20237J316 (3)

Text

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AUG y 9 g7 Mr. Sherwyn D. Hyten, Director, Plant Ser vices Wyle Laboratories Post Office Box 1008 Huntsville, Alabama 35807 g

l Gentlemen:

l The Nuclear Regulatory Commission is in the process of preparing an information l

notice entitled "Information Concerning the Use of Anaerobic Adhesive /

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Sealants."

t 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-

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tion notice, received by September 4, 1987 will be considered in the final version.

I Sincerely,

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Carl H. Berlinger, Chief Generic Connunications Branch 1

Division of Operational Events Assessment j

Office of Nuclear Reactor Regulation

Enclosure:

Draft NRC Information Notice No. 87-XX i

l DISTRIBUTION CERossi, NRR i

CHBerlinger, NRR 1

RJKiessel, NRR EJButcher, NRR WDlanning, NRR RScholl, NRR PDR

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6835 IN 87-XX j

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0FFICE OF NUCLEAR REACTOR REGULATION 1 WASHINGTON, D.C.

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NRC INFORMATION NOTICE NO. 87-XX:

INFORMATION CONCERNING THE USE OF 4 i

t ANAEROBIC ADHESIVE /SEMANTS t

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Addressees:

2 All nuclear power reactor facilities holding an operating.11 cent (OL) or a i

construction permit (CP).

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Purpose:

This information notice is provided to alert recipients to a potentially significant safety problem pertaining to the use of anaerobic adh*7sjvesand sealants.

It is expected that recipients will review the inforoaSig for applicability to their facilities and consider actions, if approprhte, to preclude a similar problem. However, suggestions contained fn this notice do not constitute NRC requirements; therefore, no specific acti, orcwritten response is required.

1 Description of Circumstances:

j 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, t

(Brunswick) one safety relief valve (SRV) failed to open then manually actuated for pressure control.

The SRV is part of the automatic deprtssurization system J

(ADS) at that plant. Subsequent testing on July 3rd of othe( ADS valves resulted in a second valve failing to open on manual actuat ko. During post 1'

t, failure examination it was determined, that during maintenance, Ldtite was 1

used to help seat a locknut in the solenoid assembly and this,t

. material migrated

,U to the solenoid clearance around the plunger prior to setting In this in-I stance, the material was Loctite RC 620. The valves at' Brunswick were recently

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rebuilt by Target Rock Corporation at Wyle Laboratory. At Brunwick, the

't failures were discovered shortly after the valves were installed and aiuy;-

containment was inerted.

5 Discussion:

?

This event is similar to that described in Information Notice 84-fil "Informa-tion Concerning the Use of Loctite 242 and Other Anaerobic Adhesf.ve/ Sealants."

In that event, Loctite 242 Threadlocking Adhesive / Sealant was u5 d 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 natnte-nance technicians to wipe excess Loctite from the assembly which 6tnolted in j

the bonding of the solenoid core riunger to the base assembly.'

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IN 87 XX d

August xx, 1987 i

Page 2 of 2 N

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The $runswick SRVs aHo failed because excess LGetite was not cleaned by the

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contractor technician from the plunger assembly.J In' this latter ca'se, Loctite 3

l RC 620 was used. This sub:tance is anaerotic (cures in the absence of air).

i Thus, the plunger did not become seized unt 4 hfter the valves with excess Loctite were plac?d in the inerted atmosphes! which exists in the reactor 1

containment when the reactor is brought td)ower conditions.

t No specific action or written response is required by this information notice.

It'you have any questions about tnis matter, please contact the Regional

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Administrator of the appropriate' regional office or this office.

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Charles E. Rossi, Director Division of Operational Events Assessment

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5 Technical

Contact:

Ray Scholl, NRR (301) 492-8213 i1

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Attachment:

List of Recently I$ sued Information Notices f

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