ML20010F855
| ML20010F855 | |
| Person / Time | |
|---|---|
| Site: | San Onofre  |
| Issue date: | 09/01/1981 |
| From: | Papay L SOUTHERN CALIFORNIA EDISON CO. |
| To: | Engelken R NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION IV) |
| References | |
| 10CFR-050.55E, 10CFR-50.55E, NUDOCS 8109110463 | |
| Download: ML20010F855 (3) | |
Text
I 50.55(e) Report
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y@p Docket Nos. 50-361/362 t
Southern California Edison Company
[G R O. BOX 8 00 2244 WALNUT GROVE AVENUE Re>SEM EAD, CALWORNIA 91770 g
al3-57g*g47' vict petsietser September 1, 1981 G
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Mr. R. H. Engelken, Director s
Office of Inspection and Enforcement yd l',)j Q
U. S. Nuclear Regulatory Commission Co y
3 Region V
<3 Suite 202, Walnut Creek Plaza 9;
Walnut Creek, California 94596
'A 1990 North California Boulevard 0$ p p
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Dear Mr. Engelken:
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Subject:
Docket Nos. 50-361 and 50-362 San Onofre Nuclear Generating Station, Units 2 and 3 In a letter to your office dated August 4, 1981 we idencified a condition which we com idered reportable in accordance with 10CFR50.55(e).
The condition involves the use of a flammable spray adhesive to secure fireproof insula-tion to electrical components.
Enclosed in accordance with 10CFR50.55(e) are twenty-five (25) copies of a Final Report entitled, " FINAL REPORT ON THE USE OF FIAMMABLE SPRAY ADHESIVE WITH FIREPROOF INSULATION, San Onofre Nuclear Generating Station, Units 2 and 3."
If you have any questions regarding this report, we would be pleased to discuss this matter with you at your con-venience.
Very truly yours,
- 7V sw Enclosures
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cc:
Victor Stello (NRC, Director I&E)
R. J. Pate (NRC, San Onofre Units 2&3)
/ j 8109110463 810901 PDR ADOCK 05000361 S
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FINAL REPORT ON THE USE OF FLAMMABLE "? RAY ADHESIVE WITH FIREPROOF INSULATION San Onofre Nuclear Generating Station, Units 2 and 3 INTRODUCTION This report is submitted pursuant to 10CFR30.55(e)(3).
It describes a condition discovered during construction.
This report includes a description of the conditior., an analysis of the safety implica-tions, and a summary of corrective action taken.
By letter dated August 4, 1981 Southern California Edison confirmed notification to the NRC of the reportable condition.
BACKGROUND During inspection of the installation of fireproof cerablanket wraps on certain electrical components such as cable trays, tray supports, conduit, and conduit supports, it was determined that 3M No. 77 spray adhesive was used by the installer as a construction aid.
This spray adhesive contains a flammable component when wet.
It is not capable of supporting combustion after drying.
In addition, the adhesive can delaminate when heated in excess of 0
180 F.
DISCUSSION The fc11owing discussion is responsive to 10CFR50.55(e)(3).
Description of the Deficiency A spray adhesive, manufactured by the 3M company, was used during the installation of fir 1 proofing on certain electrical components in both Unit 2 and Unit 3.
This application was limited to use of enough adhesive to hold the initial layer of cerablanket in place until the total installation could be completed and approved fireproof bands applied.
Analysis of Safety Implications A comprehensive review of the use of 3M No. 77 spray adhesive in San Onofre Units 2 and 3 did not indicate a significant reduction in safety.
This is based on:
(A)
The very limited use of the adhesive.
(B)
It was used only to hold the lower layer of fire-proofing in place during installation.
(C)
It could not coue in direct contact with flame due to the type of wraps used.
(D)
After installation it served no functional purpose.
FINAL REPORT ON THE USE OF FIAMMABLE SPRAY ADHESIVE Page 2 WITH FIREPROOF INSUIATION San Onofre Units 2&3 Corrective Action Although the limited use of this caterial had no safety implica-tiens, all spray adhesive used was identified and removed.
- Secondly, the use of any flammable adhesive was discontinued.
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