ML20151L436
| ML20151L436 | |
| Person / Time | |
|---|---|
| Issue date: | 01/31/1994 |
| From: | Paul R, Ulie J NRC OFFICE OF INVESTIGATIONS (OI) |
| To: | |
| Shared Package | |
| ML20150F728 | List:
|
| References | |
| FOIA-97-180 NUDOCS 9708070003 | |
| Download: ML20151L436 (7) | |
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,M REPORT OF INTERVIEW WITH GREGORY J. JAROSZ On January 28, 1994, Gregory J. JAROSZ was interviewed at Transco Products, Inc., 55 East-Jackson Blvd., Chicago, Illinois, by NRC:0I Senior Investigator Richard C. Paul and NRC:01 Investigator Joseph M. Ulie. Also present at the interview was Robert G0SS, as JAROSZ's personal representative..
JAROSZ related the following:
JAROSZ said he had been employed by Transco Products, Inc., since 1982.
JAROSZ_ said his present title is Product Manager, and he has responsibilities for fire penetration seals and fire barriers. JAROSZ remarked that he had previously worked for Brand Industries (BISCO) (1972-1975), Chemtrol (75-76),
and. Tex-Sil (76-82) prior to going to Transco. JAROSZ said he has had ex-perience with the use of Dow Corning silicone foam in fire penetration seals since the early 1970s.
JAROSZ said that he was involved with Transco's installation of fire penetration seals at the Millstone Nuclear Plant. According to JAROSZ, Transco began to install the seals. in 1984 utilizing CT Gypsum cement,
. manufactured by U.S. Gypsum and marketed by Transco. Subsequently, Jack CARTER of Stone & Webster (SWEC), the architect / engineer at Millstone, decided.to switch to Dow Corning silicone foam (Type 3-6548) as the material for the penetration seals over Transco's objections.
Transco is a licensed Dow Corning silicone foam applicator but preferred to install their own l
product, the gypsum seal.
Transco was then told to develop a procedure to conduct a fire qualification test for a nine or ten inch silicone foam fire penetration seal without a damming board. JAROSZ said he told SWEC that i
this seal would not pass the test. JAROSZ said it was his experience with the Dow Corning material that the minimum thickness for certain configura-tions that could be used to qualify as a three hour barrier was 9-10 inches with.a one inch alumina silica board.
In April 1985, Transco conducted two fire tests of a 12 inch penetration seal without a damming board at Construction Technology Laboratories (CTL), Skokie, Illinois. JAROSZ said that Transco constructed the test articles and in-stalled the seals. The tests were witnessed by SWEC QA/QC and Russ HALL of.
i CTL.
JAROSZ indicated that he wrote the test procedure utilizing ANI, E119, and IEEE 634 criteria for the three hour tests. The tests resulted in gross failures with flame throughs and high temperatures (a: 325'F above ambient) at i
about 2 hours2.314815e-5 days <br />5.555556e-4 hours <br />3.306878e-6 weeks <br />7.61e-7 months <br /> and 40 minutes. Transco has numbered these tests TR-189 and
.TR-190, both Trial 1.
JAROSZ sairl that Northeast Utilities (NU)1 the licensee for Millstone, and l
SWEC thought Transco had purposely failed these tests because they (Transco) l wanted to use-the gypsum product. SWEC then told Transco to repeat the tests and had Hitoshi (Tak) TAKAHASHI of Dow Corning come out to inspect the fire penetration seal installation. JAROSZ remarked that TAKAHASHI checked the density of the silicone foam used for the penetration seals. Dow Corning
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issued a letter dated April 9,1985, regarding TAKAHASKI's inspection.
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EXHIBIT Case No. 3-93-028R 1
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On April 27, 1985, Transco retested TR-190, and it again failed. JAROSZ said SWEC then decided to add the one inch alumina silica damming board to the seal configuration. These configurations were then successfully tested. JAROSZ said that Transco reported the results of these tests in a report written under Transco letterhead.
Regarding the allegation that Dow Corning had changed the formula of their silicone foam (3-6548), JAROSZ responded that he had heard rumors of this but was unaware of this happening. According to JAROSZ the only changes he has noticed to the silicone foam was that the density of the material had changed over the years, but it was his observation that it had improved. JAROSZ commented that the density is a key factor in marketing the silicone foam and can be critical to the fire resistance ability of the material.
Regarding the concerns that the silicone foam seals have problems with shrinkage and air pockets, JAROSZ commented that Dow Corning has notified their customers of this over the years and provided 01 with copies of three l
Dow Corning letters from 1983 and 1985 relative to these problems. JAROSZ acknowledged that he has no direct knowledge of a formula change to the Dow Corning silicone foam material.
This Report of Interview was drafted on January 31, 1994.
N Richard C. Paul Senior Investigator Office of Investigations Field Office, Region III i
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i seph M. Ulie, Investigator Office of Investigations Field Office, Region III l
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Case No. 3-93-028R 2
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" Data Comparisons Regardintf 5-3 Ilour Fire Tasts of #TCO-OSO Silicone w
Foam Installed with & without Permanent Damming in Electrical Diockouts" r_va e
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7 DOW CORNING V
EkhINMbb DOW CORNING U.S.A.
April 9. 1985 uin t3 s o, nic nior n 4,6 e o994 Tele phone: (517) 496-4000 l
Transco, Inc.
55 East Jackson Boulevard Chicago, IL 60604 Attention: Mr. Greg Jarosz
Reference:
PREPARATION OF FIRE TEST SLABS N05. TR189 AND TR190 As agreed upon earlier, I went to Portland Cement Association, Skokie, Illinois on March 18, 1985 to witness the installation of 00W CORNING @ 3-6548 Silicone RTV Foam into the two concrete test slabs referenced above.
Because the intent of this eyewitness account is not to report design aspects of the fire test assemblies nor fire test 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.
Enclosed please find the report concerning installation of the silicone foam in the two test slabs.
If you have any questions or comments on the attached report, please let me know.
Yours truly, Hitoshi Takahashi Senior Technical Services Specialist Technical Services and Development
Enclosure:
Transco Inc. Fire Tests Nos. TR189 and TR190
)D [$ [b $ b j\\\\
o APR 1.t PJos D7/**/J85 TRANSCO, INC. 2 3593-026 r.xHia:T M
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TRANSCO, INC. FIRE TESTS NOS. TR189 AND TR190 Installation of DOW CORNING 9 3-6548 Silicone RTV Foam In the Test Slabs Date of Reporting: March 21,1985 Date of Installation: March 18,1985 Place of Installation:
Pnrtland Cement Association, Skokie, Illinois.
Greg Jarosz, Bob Fatt and Scott Slute of Transco were handling every phase of the silicone foam installation into the test slabs, except for i
QA checking. The two test slabs had been formed with the temporary damming with all penetrating items (except for the repair cables) in place in prior to my arrival. DOW CORNING $ 3-6548 Silicone RTV Foam (Lot Nos. EH084735 A/EN025889 B) in 55 gallon drums had been airfreighted from the Hillstone project site for the tests.
The lot combination was exclusively used for construction of the test assemblies.
Agitation of liquid components in each drum with rotatry blade mixers attached to an electric drill was properly conducted prior to the transfer of the liquids into the reservoir tanks of the foam dispensing machine, which was confirmed by checking density and snap time of the l
l samples taken during the transfer.
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The foaming machine used for the test slabs installation was made up with a Graco displacement pump and a Sealant Equipment dynamic mixing gun connected with approximately 30 foot long hoses. Mixing ratio of l
the machine was checked twice during the installation, and found to be-in the proper one to one ratio. The mixing blade of the gun tended to disengage from the air motor connector, resulting in poorly mixed liquids coming out of the dispensing nozzle. The insufficient mixing happened at least three times during the installation and each time the layer was removed by hand.
Density, snap time, call structure and color of the cured foam were checked during the installation process by taking machine mirei foam samples as well as by hand mixing liquid components samples teken from the reservoir tanks of the dispensing machine. The results of the foam quality checking are summarized in the attached. Other than the fact the cured foam samples exhibited slightly lighter shade than usual, the properties of the foam made out of the A and B lot combination r
l represented typical production lots.
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b EXHIBIT A OF Y PAGE(S) o 'd E
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l TRANSCO, INC. FIRE TESTS N05. TR189 AND TR190 Installation of DOW CORNING 9 3-6548 Page 2 Silicone RTV foam In the Test Slabs l
l 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 trken to allow the liquid foam to flow and fill gaps between cables by eiggling them during foam injection.
(Note: The insufficiently mixed foam which flowed in gaps between cables while the mixing blade rf 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 insta11at:on of the silicone foam, removal of the 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.
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a.
Proper maintenance of the mixing equipment and its parts (especially the mixing gun).
b.
Installing lids or covers over the reservoir tanks of the mixing 1
l 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
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P FOUR POINT FIELD QUALITY CHECK OF DOW CORNINGD 3-6548 S (for Transcr,, 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:
Machine mixed samples a
_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 i
Color Grade 4-5*
Cell Structure Grade 6*
Grades 1 and 2: unacceptable I
Grades 3 - 6:
acceptable (6:4 best) 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 Densi ty 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 (ungreasedi~
Snap Time 2 minutes and 58 seconds Color Grade 4-5 Cell Structure Grade 5
/b F.XHIBIT PAGE 4 OF Y PAGE(S)
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