ML20210N593
| ML20210N593 | |
| Person / Time | |
|---|---|
| Issue date: | 06/30/1995 |
| From: | Khadijah West NRC (Affiliation Not Assigned) |
| To: | Paul R NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION III) |
| Shared Package | |
| ML20210N260 | List: |
| References | |
| FOIA-97-180 TAC-M91287, NUDOCS 9708250388 | |
| Download: ML20210N593 (2) | |
Text
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NUCLEAR REGULATORY COMMISSION WASHINGTON. o.C. somHooi
\*****p# June 30. 1995 LIMITED DISTRIBUTION MEMORANDUM TO: Richard C. Paul, Senior Investigator Office of Investigations Field Office Region !!!
FROM: K. Steven West, Chief '
Fire Protection Section Plant Systems Branch Office of Nuclear Reactor Regulation
SUBJECT:
ALLEGATION RELATED TO DOW CORNING PART 21, ALLEGATION NRR-94-A-0080 (TAC M91287)
B) memorandum of December 15, 1994, you forwarded information that provided to you regarding a Part 21 notification submitted by Dow Cttrning-h Corporation (DowCorning)onitsSylgard170SiliconeFastCureElastomerQ This Part 21 notification is tracked by the Office or Nuclear Reactor Regulation (NRR) under Part 21 Log No.94-294.
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.m k part of our technical review of the Dow Corning Part 21 notification, we met with Dow Corning representatives during a public meeting on
', January 31, 1995. We also conducted inspections of Dow Corning facilities and witnessed fire endurance testing activities at Underwriters Laboratories. The attached inspection re, port-(NRC Inspection No. 99901284/95-01, May 31, 1995) documents the results of our review of the curing issue. In summary, on the basis of its investigation, Dow Corning found that the deviation from its cure time sper5fications was caused by high levels of sulphur. The inspection team concludes that Dow Corning satisfactorily performed its investigative and corrective actions of its concerns regarding cure time.
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meeting on January 31, 1995, resen ves s t they h
were not aware of curing pro lems that could be attributed to the addition of lead to penetration seal niaterials by the penetration seal installation CONTACT: Steven West, NRR/SPLB i 301-415-1220 LIMITED DISTRIBUTION /
9708250388 970814 PDR FOIA QUNTER97-1BO PDR -
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June 30, 1995
. LIMITED DISTRIBUTION R. Paul companies. During a followup telephone conference on June 23, 1995, a Dow Corning representative informed me that lead does not effect the curing process. However, contamination of the lead fines with high levels of sulphur and some amines could inhibit the curing process. The representative stated that the seal installation companies guard against this possibility by using lead of appropriate purity and quality. He also reaffirnied that Dow Corning has not received reports of curing problems created by seal additives such as lead.
During the meeting on January 31, 1995, the Dow Corning representatives also stated that they were not aware of problems at nuclear power plants related to reactions between Dow Corning fire barrier penetration seal materials and cable jackets. During the followup telephone conference, the Dow Corning representative informed me that hypalon cable jackets can prevent elastomer seal materials from curing in the immedi..e vicinity of the cable j?-ket. In this situat. ion, the seal material is effected but the cable jacket is not.
T9 s condition is prevented by coating the hypalon jackets with a releasing agent before installing the penetration seal materials.
, As part of our review, we also audited industry operating experience, by l reviewing a sample of licensee event reports. We did not find reports of l problems related to lead content, cure time, or reactions between cable Jackets and penetration seal materials. On the basis of our overall review l
and evaluati we concluded that curing problem detailed in the Part 21 ,)h notification as related to sulphur contamination and
, not to the a on o ea e seal materials. In addition, we did not i
substantiate the assertion that the addition of lead effects seal cure time.
Finally, although we agree that certain cable jacket materials can inhibit or prevent curing at the cable jacket-seal interface, we did not 'nd operating experience to indicate that this is a problem within industry.
We re continuing our neric assessment fire y rrier penetration seals
[duringtheseactivities.
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/ However, our efforts on Allegation NRR-94 0080'and TAC M91287 are complete.
't If we uncover technical information that causes us to change the conclu uns stated above, we will provide it to you.
Attachment:
As stated Distribution w/att.
JLee SWest DOCUMENT NAME: Gl\SECTIONC\ WEST \M91287.SW n me . ..n .m. ua4.. . in o h/'. cgv a8.us .n.cn no.ncw... r cm -n n.ch-nu. ace.-. r Noc m 0FFICE NRR : S PLB,,, ' kRMACTdY NRR:SPLB ,.,,_ ,
l NAME SWest WO JLee CMcCrackeq 7 h DATE 06/]%/9B" ' 06/9/95 067 /'/95 0FFICIAL RECORD COPY LIMITED DISTRIBUTION ./
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