ML20196H562
| ML20196H562 | |
| Person / Time | |
|---|---|
| Issue date: | 12/22/1995 |
| From: | Murphy D NRC OFFICE OF INVESTIGATIONS (OI) |
| To: | Russell W NRC (Affiliation Not Assigned) |
| Shared Package | |
| ML20150F728 | List:
|
| References | |
| FOIA-97-180 NUDOCS 9707300216 | |
| Download: ML20196H562 (20) | |
Text
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UNITED STATH lM y
- ,E NUCLEAR REIULATORY CEMMISSION l
OFFICE OF INVESTIGATIONS FIELD C*0E. REGION lit
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EIYo%"# EEL, December 22, 1995 I
MEMORANDUM TO:
William Russell, Director Of 'ce of Nu ar React r R gulation 7
FROM:
aniel D.
y, ting irector Office of Investigations Field Office, Region III
SUBJECT:
BRAND INDUSTRIAL SERVICES COMPANY (BISCO): ALLEGED HATERIAL FALSE STATEMENTS (OI CASE 3 94 068)
Attached, for whatever action you deem appropriate, is the Office of Investigations (OI) Report of Investigation concerning the above matter Internal NRC access and dissemination should be on a need to know basis.
Treat as " Official Use Only."
Attachment:
Report w/ exhibit cc w/ attachment:
1 H. Miller. RA:RIII j
B. Burgess. RIII J. Lieberman, OE L. Chandler, 0GC cc w/ report:
H. Thompson, Jr.. DEDS 9707300216 970724 f
[*
OUNTER97-100 PDR q,unsoo:vu ao u
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December 22, 1995 MEMORANDUM T0:
William Russell, Director Office of Nuclear Reactor Regulation FROM:
Daniel D. Murphy, Acting Director Office of Investigations Field Office, Region III
SUBJECT:
BRAND INDUSTRIAL SERVICES COMPANY (BISCO): ALLEGED MATERIAL FALSE STATEMENTS (OI CASE 3 94 068)
Attached, for whatever action you deem appropriate, is the Office of Investigations (01) Report of Investigation concerning the above matter Internal NRC access and dissemination should be on a need to know basis.
Treat as " Official Use Only."
Attachment:
Report w/ exhibit cc w/ attachment:
H. Hiller, RA:RIII B. Burgess, RIII J. Lieberman, OE L. Chandler, 0GC cc w/ report:
H. Thompson, Jr., DEDS Distribution:
s/f 3 94 068 c/f D. Lewis, OI:HQ (1 report w/ exhibits: 1 report only)
B. Barber, DI:HQ w/ Title Page & Synopsis To receive a copy of this document, indicate in the box "C' = Copy without attach /enci "E" = Copy with attach /enci "N* =
5 evious page for concurrence:
0FFICE
- 01:RIII _
c NAME PAUL:ct N b DATE 12/2//95 0FFICIAL RECORD COPY i
bf//2C
bcct B. Clark - 069 D.Ellwnngar - Atlanta M'
W.
Frank - 069 R.
Garrott - Dallas R.
Hartlein-CO2424 H. Maudlin - Houston w-==~,..--
J.
Haroer - 069 S. Mays - Chicago NI' E.
Rusk - CO2310 B. Miller - Atlanta
- =A.5 5$(l# V 't !i
.. w.c._,:_.. ;
C. Wolf HT/ file
)
(NOTE: This letter was sent to all on the February 16, 1983 attached Applicator listing.)
Mr. Ralph Block, Manager Fire Safety Division B & B Insulation, Incorpurated P. O. Box 2531 Houston, TX 77001 Mr. Block:
REFERENCE:
00W CORNING
- 3-6548 SILICONE RTV FOAM l
You should be well aware of the necessity for extra precau-tions your field technicians have to take when pouring the silicone foam in large penetration openings often found in power generating plants.
Based on data generated from extensive internal experiments and additional field obser-vations at power plant construction sites, a Dow Corning team led by Dr. James Falender has developed the attached technical recommendations.
If.your current field installa-tion manual does not addres.s those points covered in our recommendations, we strongly suggest you take immediate actions to revise it so that they will be included.
Please note Items No. 1, 2, 4 and 6 in the recommendations should always be adhered to.
Please also note Items No. 3 and 5 are somewhat complementary.
When forced to pour the silicone foam under environmental conditions exceeding the temperature / humidity limits set forth in Item No. 3, the modified installation technique suggested in Item No. 5 should be employed.
Under favorable ambient and instal-lation conditions, this method may not always be required.
Should you want to gain ANI acceptance to allow the modified foam installation technique utilized in your own ANI approved sealing systems, please write to Mr. W. Barnhoff 6f ANI with a copy of the PCA fire test report which is attached to the technical recommendations.
ANI is now aware t
of this method and the equivalency in fire endurance proper-ties of the silicone foam poured either by the regular or modified methods.
Rather than issuing a blanket approval for the modified method to Dow Corning, however, ANI has elected to issue acceptances to individual ANI license l
1 if
Mr. Ralph Bicek February 16, 1983 Page 2 holders, upon written request, to allow uses of the modified method in lieu of the documented standard method.
Please feel free to give me a call at any time you need additional explanations or clarifications on the attached technical recommendations.
Yours truly, 5
,.s H. (Tak) Takahashi Sr. Specialist Technical Service & Development DOW CORNING CORPORATION Phone:
(517)-496-4664 sk Att achmerit s 8
4 I
E Movember 12,1984 e
fot DOW CORNIMG POWER APPLICAf0its Effective Dneeder 1,1984,ied.the forestation of DOW tonMIMo* 3 6548 Silicone atV foon will be slightly medf r Dow corning has condected E.814 testing at.the Portland Cement Association, a nettonelly reeerleed ledependent testing egency.
Ihts testing choirs that this sedified forevletion meets or exceeds the proper.
ties of the existing DOW CORN!N9' 3 6546 Silltone RTV. foam, copies of these tett rpports are evellabl6 frem my office upon request.
Effective November 20, 1994, the shelf life of ffL96RD* 170 fast cure allicone elestemer Ms w111 be theressed to 12 months. Your request for.en increese of the shelf life of $YtMRD* B27 M8 tilicone dielectic pel in still under inves tiget ton. Tov vill be edytted if and when we een make this thenge.
Sincerely.
N Janet L. tilse Senter 19erket sepa* visor Firestop Merketing mit:LEft:03 i
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3-93-028 EXHIBIT 3
PAGE
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OF _ l PAGEIS'
/$ hitw
1 Nm n.m3d @g=n yw nd DOW CORNING U.S.A.
April 9, 1985 MIDLAND, MICHIGAN 48640-0994 Telephone: ($17) 496-40'00 Transco, Inc.
55 East Jackson Boulevard Chicago, IL 60604 Attention: Mr. Greg Jarosz
Reference:
PREPARATION OF FIRE TEST SLABS NOS. TR189 AN0 TR190 As agreed upon earlier, I went to Portland Cement Association, Skokie, Illinois on March 18, 1985 to witness the installation of DOW CORNING 9 3-6548 referenced above.
Silicone RTV Foam into the two concrete test slabs to report design aspects of the fire test assemblies nor fire testBeca results, which will no doubt be detailed in test reports of PCA, the scope of reporting will be limited to material handling by the installers, characteristics of the specific lots of the materials used and key installation techniques believed to have measurable effects on test results.
of the silicone foam in the two test slabs. Enclosed please find the report conc If you have any questions or comments on the attached report, please let me know.
Yours truly, l
Hitoshi Takahashi Senior Technical Services Specialist Technical Services and Development
Enclosure:
Transco Inc. Fire Tests Nos. TR189 and TR190 i
]ND I@ LIV 2 l
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APR.t.tiUos 07/mm/ jam TRANSCO INC. 2 f
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TRANSCO, INC. FIRE TESTS N05. TR189 AND TR190 Installation of DOW CORNING 9 3-6548 Page 2 Silicone RTV Foam In the Test Slabs The foam installation was done with special care not to pour too much liquid layer in one spot.
It took a total of 9 lifts (including the touch up pour) to install 12 inches thick foam in the test slabs.
Between the pours, waiting time of minimum 15 minutes was allowed.
(Approximately 50 minutes waiting time was given between the 6th and 7th pours due to the interruption of the foam installation by the hose stream test.) Proper care was taken to allow the liquid foam to flow and (fil gaps between cables by wiggling them during foam injection.
(Note: The insufficiently mixed foam which flowed in gaps between cables while the mixing blade of the gun was slipping was allowed to stay in place due to the difficulties of removing it.)
72 hours8.333333e-4 days <br />0.02 hours <br />1.190476e-4 weeks <br />2.7396e-5 months <br /> after the installation of the silicone foam, removal of the i
i temporary damming boards and trimming of excess foam were performed.
There were two areas which were noted for future improvements in the silicone foam installation.
They are:
i l
a.
Proper maintenance of the mixing equipment and its parts i
(especially the mixing gun).
b.
Installing lids or covers over the reservoir tanks of the mixing equipment in order to avoid foreign materials falling into the liquid components of the silicone foam.
Reported By:
H. Takahashi Senior Technical Service Specialist Technical Service and Development Date:
8 -2/-85
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FOUR POINT FIELD QUALITY CHECK 0F DOW CORNING @ 3-6548 SILICONE (For Transco, Inc. Fire Tests TR189 and TR190)
Date: March 18,1985 Place:
Portland Cement Association, Skokie, Illinois Lot Nos:
Part A - EH084735 Part B - EN025889 Results:
a Machine mixed samples a-1 Beginning of installation Measured by Dow Corning Density 18.8 pcf (greased) and 21.8 pcf (ungreased)
Snap Time 1 minute and 40 seconds Color Grade 4-5*
Cell Structure Grade 6*
Grades 1 and 2: unacceptable Grades 3 - 6:
acceptable (6:4 be:t) a-2 End of installation Measured by Dow Corning Density 19.6 pcf (greased) and 21.9 pcf (ungreased)
Snap Time 2 minutes and 45 seconds Color Grade 4-5 Cell Structure Grade 6 b
Hand mixed samples b-1 Beginning of installation Measured by Dow Corning Density 20.2 pcf (greased) and 25.2 pcf (ungreased)
Snap Time 1 minute and 43 seconds Color Grade 4-5 Cell Structure Grade 5 b-2 End of installation Measured by Dow Corning Density 19.9 pcf (greased) and 23.3 pcf (ungreased)
Snap Time 2 minutes and 58 seconds Color Grade 4-5 Cell Structure Grade 5 l
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TRANSCO PRODUCTS INC.
EXECUTIVE OFFICES P
nnu n za - m a Chicago. Illinois 60G04416G 312-427281B Telex Na 25 C134 May 2, 1985 Mr. W.
G. Carter Senior Contracts Administrator Stone and Webster Engineering Corporation Millstone, Unit 3 Nuclear Power Station Millstone Drive Waterford, CT 06385
SUBJECT:
M111' stone, Unit 3 N.P.S.
i Contract.No. 2400.000-630 Firestops and Penetration Seals l
Data Comparisons Regarding j
5-3 Hour Fire. Tests of TCO-050 Silicone Foam, Installed with &
without Permanent Damming, in Electrical Blockouts.
REFERENCES:
Test Procedure #TR-189 Rev. 1 Test Procedure #TR-189 Rev. 2 Test Procedure #TR-190 Rev. 1 Test Procedure #TR-190 Rev. 2 PSQAP 9.2 Rev. 2, Special Processes-Silicone Foam l
Quality Control Files:
- TR-189 Trial #1 l
- TR-189 Trial #2
- TR-190 Trial #1
- TR-190 Trial #2
- TR-190 Trial #3
- Transco Products Inc. Test Report:
- TR-189
- Transco Products Inc. Test. Report:
- TR-190 To follow upon review by "P.C.A./C.T.L."
Gentlemen:
Enclosed, please find the five (5) Quality Control Files listed as references above.
These files include:
1.
Receiving Inspection Reports 2.
Field Takeoff, Installation, and Inspection Records 3 '
3.
Batch Sample Density Measurement Records 4..
Field Data Sheets 5.
Q.C. Sample Inspection Records t
A CORPORATION OF THE TRANSCO GROUP' h
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' TRANSCC PRODUCTS INC.
Mr. W. G. Carter Stone and Webster Engineering Corporation May 2, 1985
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1 6.
Handwritten notes regarding Specimen Fabrication, Cable Loadings, etc.
7.
Mapping of Thermocouple Layout 8.
Attachment "B"; Qualitative Laboratory Notes and Quanti-tative Thermocouple Data.
Also enclosed, please find Test Matrix #TPI-050; " Data Comparison's Regarding 5-3 Hour Fire Tests of #TCO-050 Silicone Foam Installed with and without Permanent Damming in Electrical Blockouts."
From this comparison matrix, please note the following:
1.
Average sample densities were derived from their respective Q.C. File, " Batch Sample Density Records."
2.
Average Sample densities for all tests varied only 8% max.
from their mean.
3.
Cure time appears to have had no substantial affect on the inability of reasonably identical seals to withstand a 3 hour3.472222e-5 days <br />8.333333e-4 hours <br />4.960317e-6 weeks <br />1.1415e-6 months <br /> exposure to increasing atmospheric temperatures, per the ASTM-E119 time vs. temperature curve.
4.
A very substantial decrease in expansion and vibration of the unexposed seal surface was apparent during tests where permanent damming was installed, (see:
" Notes Indicated During Test").
Once again, cure time appeared to have no affect.
5.
Final cable and surface temperatures dropped considerably when seals consisting of 10" of silicone foam and 1" of permanent damming were tested.
6.
Before testing #TR-189, Trial #1 and #2; damming was removed from all conduits whenever possible.
In chis respect, final cable, conduit surface, and conduit and seal temperatures showed a marked decline by simply using 1" of permanent damming around conduits and within the blockout.
During our post test observations, it was noted that the maximum
, amount of seal ablation decreased from approximately 8 to 9" for Tests #TR-190, Trials #1 and #2 to 4 to 5" for Test #TR-190, Trial #3.
It was also noted, that whereas 2 to 3" of the aluminum conduits in Test #189, Trial #1 had burned away; the aluminum conduits in #TR-189, Trial #2 remained basically intact.
A CORPORATION OF THE TRANSCO GROUP
g
.V TRANSCO PRODUCTS INC.
"E" o
Mr. W. G.
Carter Stone and Webster Engineering Corporation May 2, 1985 We hope that the amount of information enclosed herein is found adequate for. comparison, and are looking forward to any comments you may have in regards to this subject.
Yours truly, A
Robert Fatt Technical Development o
RF/jk Enclosures cc:
V. Skuran G. Jarost-A. Rice J. O' Leary 4
S A CORPORATION OF THE TRANSCO GROUP
,e TEST MATRIX NTPI-050
" Data Comparisons Regarding 5-3 Hour Fire Tests of NTCO-050 Silicone Foam Installed with & without Permanent Damming ~ in Electrical Blockouts" (157 to).
A rtl.lCA el.E rTFE DATE APPLICAel.E A'yEDAGE CAWLR AVEDAOS isATE Ctuat teatt's It4DtCATEtt tweetttal TEST tt M utt toes easettet eLST S EA L ltGSTALB.El IIGSTAl.IATIOt SAtat*t.E Assesttifet5 SAfert E TESTED ra ttE retOCLDURE til5 fA Lt.EO PROCEstfht DEHSitlES esed/or DECNSitlES etEPAlste illEF Alms)
.:=====-
ers-490 Sin-190 12*-Thk.
3/94/'85 PSOAP 9.2' 6 8. 2 3 8.be N t' lA 2/* e5 8 2. 92tJbe/FU 3/09/'85 2 dare esos O.C. FILE 2s48-excesolve esponstnn &
talal 88 peo. 4.
TCO-050 a nel W/C - nte to Sta-190 Trial 31 elbration in addition w /Commee nt -
Silicone 3/92/*e5 per twEC &
3 dayo At t aclime nt *G*
tea. action el seal Jept per $sstC Fome Does Cospleng
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tage 1.
due to ablattun. cause seal to I. seat away l e s:
Ces cablea la Cable Tsay
- r es ul t l ovg la llas mi s.3 bus se t he osegte.
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Is26-Condelt "A*
flame Ihvoegh a are-let sta-let 12*-ThIt.
3/02/'85 t1.92 LbeNt I/the/'eS 19.96LbeNt 3/11/*e3 3 daye sees O.C. FILE conduit & a us s ousnia ns ne a l renal el mee.
l.
TCO-OSO to stR-a89 Trial Gl 2:20-Condicit *e* ancesolve temps w /Coenme nt Silicone per SwLC Fome 4 daye A t t achme nt *e*
(see i=g.
- 7. 8. 9 A t t ac t. :e nt *e page 1, 2s30-Condelt "C'
Blame t h s owgh a cond.sts & e us s oisemliswg seal 3-S* Die.
Is30-Condelt "D" escaselve t emp.
Conduite e*-Thk.
cond s t t & seelt T M seu. 732 TCO-050 k o lo-Condui t
- E" eacesolve susta A
Sillcone t oegs. s t/c t %.
138t*F.
Fome 2s20-Conduit "F* eacessive temps tsee g.;p. 14 At t as t ent eI sta-190 078-190 12*-Tht.
3/10/'8S 18.46 thent' l/89/'el le.53Lbert 3/2 2/* e5 seals sees O.C. FtLE
-~
Telal 82 Dev.
8.
7C0-050 and 9 days gra-ISO Trial 82 2:50-encesstwo espans ton a w/Conesen sSillcone I/22/*e5 A t t achme nt
g
elbration. In ads'ltlu+
per SWEC Foam 8ePete Page 3.
seduction el eeal dept S day, due to ablation, sauce seal t o br eak ' away fee cables in Cable Tsay a s e u l t l ev3 in ilaaselng buen theo*3i t
t Telat 32 mee.
2.
t(0-Ob6 and 48.46 Lhent' l/23/'eS te 99LberE 4/4/'85 56 day.
sees O.C. 8'lLE ta>T Art >Lacant.E 372-189 tin-let IS*-Thk.
3/le/*e5 and and to NIR-le9 Trsal 32 Silicone 3/19/'85 rup Off 5/26/'85 Fome Joenhal t e as days" A t t oclament
- S*
sees O.C.
s ta t w/ & 680/
te.32 LbeN8 tage 1 Tn.Isrs tasag at l**Thk.
TCO-Oee A
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Attach =..t e-f a.ges I thou 50 7C0-010 P erma ne nt DaousI ng ef2-890 87m-890 10 *-flik.
4/02/'OS le.13 LbeNt I A4/* SS le.39thenf 4/09/*e-seele sees O.C. F il.B
'807 API'LICABLE relel 33 peo. 2.
TCO-OSO 1 day.
gle-190 Trial 93 Silicone Attachment
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sees O.C. I ll E Fome cepe l r e.
Page 1.
Taal10 Telal el w/ 4*-Thk.
. f 5 days A t t at beent *e*
I fCO-049 &
q Pages I thou 13.
j TCO-OlO
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F e rmone nt passel sop i
s TRANSCO PRODUCTS INC.
Quality Control File WTR-190, Trial #1.
Test Date: 3/09/'85
Enclosures:
- 1. Receiving Inspection Reports
- 2. Field Take-Off, Installation, & Inspection Records
- 3. Batch Sample Density Measurement Records
- 4. Field Data Sheets
- 5. O.C. Sample Inspection Records
- 6. Handwritten notes regarding Specimen Fabrication, Cable Loadings, etc.
- 7. Mapping of Thermocouple Layouts
- 8. Attachment "B"; Qualitative Laboratory Notes, and Quantitative Thermocouple Data e,
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p TRANSCO PRODUCTS INC.
Quality control File #TR-189, Trial #1.
Test Date: 3/11/'85 Inclosures: 1. Receiving Inspection Reports
- 2. Field Take-Off, Installation, & Inspection Records
- 3. Batch Sample Density Measurement Records
- 4. Field Data Sheets
- 5. O.C. Sample Inspection Records
- 6. Handwritten notes regarding Specimen Fabrication, Cable Loadings, etc.
- 7. Mapping of Thermocouple Layouts
- 8. Attachment "B"; Qualitative Laboratory Notes, and Quantitative Thermocouple Data e
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i TRANSCO PRODUCTS INC.
Quality Control File #TR-190. Trial #2.
Test Date: 3/27/'85
Enclosures:
- 1. Receiving Inspection Reports
- 2. Field Take-Off, Installation, & Inspection Records
- 3. Batch Sample Density Measurement Records
- 4. Field Data Sheets
- 5. O.C. Sample Inspection Records
- 6. Bandwritten notes regarding Specimen Fabrication, Cable Loadings, etc.
- 7. Mapping of Thermocouple Layouts B. Attachment "B"; Qualitative Laboratory N to es, and Quantitative Thermocouple Data e
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e TRANSCO PRODUCTS INC.
Quality. Control File #TR-189, Trial #2.
Test Date: 4/04/'85
Enclosures:
- 1. Receiving Inspection Reports
- 2. Field Take-Off, Installation, & Inspection Records
- 3. Batch Sample Density Measurement Records
- 4. Field Data Sheets
- 5. O.C. Sample Inspection Records
- 6. Handwritten notes regarding Specimen Fabrication, Cable Loadings, etc.
- 7. Mapping of Tnermocouple Layouts
- 8. Attachment "B": Qualitative Laboratory Notes, e
and Quantitative Thermocouple Data e
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TRANSCO PRODUCTS INC.
Quality Control File # TR-190, Trial #3.
Test Date: 4/09/'85
Enclosures:
- 1. Receiving Inspection Reports
- 2. Field Take-Off, Installation, & Inspection Records
- 3. Batch Sample Density Measurement Records
- 4. Field Data Sheets
]
- 5. Q.C. Sample Inspection Records
{
- 6. Handwritten notes regarding Specimen Fabrication, Cable Loadings, etc.
- /. Mapping of Thermocouple Layouts
- 8. Attachmant "B": Qualitative Laboratory Notes, and Ourantitative Thermocouple Data i
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DOW CORNING.
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wmm MTA& men DOW COR.NING U.S.A.
May 8, 1985 MiotAno. Mica:GAN 48640 0994 Telephone:(517) 496-4000 i
Transco Products, Inc.
{MW 1 O O 55 East Jackson Blvd.
Chicago, IL 60604 gg, 2 Attention:
Mr. Greg Jarocz Technical Manager Subj ect: DOW CORNINC@ 3-6548 SILICONE RTV FOAH This letter is to confirm what was expressed as the technical opinions of DOW CORNING durire, the meeting at Hi11 stone Unit 3 on April 16, 1985.
1.
Foam Sbrinkage It is normal to observe nominal shrinkage of the silicone foam 24 to 48 hours5.555556e-4 days <br />0.0133 hours <br />7.936508e-5 weeks <br />1.8264e-5 months <br /> after its installation, which is attributed to gradual pressure relief upon completion of the foaming reaction and thermally induced contraction when the material is cooling down i
from the mildly exothermic reaction. The nominal shrinkage of the silicone foam may be observed as either concave surface or gap formation at perimeters of penetration openings, depending on sizes of openings, adhesion of the foam to the side of an opening, etc.
If such gaps are no more than one third of the total depth of the silicone foam and are no larger than 3/8 inch in width, there should be no adverse effects on the fire resistant performance of the silicone foam firestop assembly.
If, however, gaps are deeper and/or vider than the above lirits, repair work is recommended.
Applying beads of DOW CORNING @ 96-081 RTV Adhesive / Sealant to fill gaps in approximately one inch depth is the recommended repair procedure.
2.
Foam Delamination (Layering)
There are external end installation conditions which are identified to cause foam delamination.
Included are high moisture content in air (absolute humidity) when the foam is installed, air-borne contaminants, and poor installation techniques. Adhering to a proper installation procedure ensures to minimize foam delsmination as long as there is no gross air-borne contamination in existence, i
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r A three-h ur rated ASIM E-Il9 fire exposure and hose stream test run by Portland Cement Association, Skokie, IL compared fire resistive properties of the silicone foam with and without de-lamination. The results of the comparison test established that 4
the presence of air voids in the range of 10 to 15% of the total thickness of the silicone foam does not adversely affect the intended performance of the product.
(
Reference:
Con st ruction Technology Laboratories, Portland Cement Association Test Report No. CR5142 dated July 1983).
l The installation procedure of Transco Products, Inc., was reviewed, and it is considered that it adequately addresses the prerequisite i
for minimizing foam delamination.
3.
Waiting Perici Between Foam Pours 4
A penetration sealing design which incorporates alumina-silicate boards as permanent damming along with minimum 9 inches of the silicone foam, is considered to have additional safety factors built in to pass the 3 hour3.472222e-5 days <br />8.333333e-4 hours <br />4.960317e-6 weeks <br />1.1415e-6 months <br /> rated ASTM E-119 test criteria. While more critical sealing designs constructed with a 12 inches thick foam without permanent damming boards require special precautions to opt {mize installation of the foam in a larger free area (over 400 in without any penetrating items in a floor opening), foam 3
installation in designs with the permanent damming boards can be
'j handled in an expedient manner. For example, instead of waiting
{
for 15 minutes between the foam pours, a 5 minute waiting period l
should be sufficient for installation of the foam in a foam / perma-nent damming design.
4 4.
Mixing Ratio Check j
It is recommended to conduct mixing ratio check of foam dispensing equipment at least once every shift at the beginning of each shift.
During the field observation which followed the meeting, I had oppor-j tunity to inspect two silicone foam penetration seals which had been suspected of posing foam shrinkage problems. Neither one of the 4
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seals exhibited gsps greater than the maximum allowable limits described earlier in this letter. The appearance of thoce two foam seals was a typical one I have seen at many other nuclear power plants, and I could not find any defects in them.
If you have any questions on the subjects covered in this letter, please let me knew.
Yours truly, H. Takahashi Sr. Technical Service Specialist Technical Service and Development W. G. Carter - Stone & Webster Engineering, Corp., CT.
ces J. P. Carter - Stone & Webster Engineering, Corp., CT.
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