ML19225A835
| ML19225A835 | |
| Person / Time | |
|---|---|
| Site: | Fort Calhoun  |
| Issue date: | 07/11/1979 |
| From: | Short T OMAHA PUBLIC POWER DISTRICT |
| To: | Reid R Office of Nuclear Reactor Regulation |
| References | |
| NUDOCS 7907200364 | |
| Download: ML19225A835 (1) | |
Text
A L-n-
s Omaha Public Power District 1623 HARNEY OMAHA. NESRASKA 68102 TELEPHONE 536 4000 AREA CODE 402 July 11, 1979 Director of Nuclear Reactor Regulation ATTN:
Mr. Robert W. Reid, Chief Operating Reactors Branch ilo. 4 U. S. iluclear Regulatory Commission Washington, D. C. 20555 Re fe ren ce:
Docket No. 50-235 Gentlemen:
In response to a telephone conversation held with a member of your staff, the following information is provided to indicate the ability of fire rated silicone foam penetration seals installed at the Fort Calhoun Station to withstand differential pressure.
All subject penetrations at the station were installed by 3 & B Insulation, Inc., per Cheatrol Corporation accepted installation procedures.
Chemtrol has fire tested and obtained approval via American Nuclear Insurers (Aill) for penetraticns installed per these procedures.
Chemtrol Corporation was contacted and acknowledged that a successful differential pressure / fire test was conducted for a utility in which a positive pressure of 9.0 incnes of water was maintained on a 5,885 square inch penetration over a duration of a three-hour fire test.
At the Fort Calhoun Station Unit No.1, the largest penetration is 1,924 square inches; the maximum fire loading is only 97 minutes; and the maximum differential pressure expected is approximately 0.5 inches of water.
Since these sizes, fire loading, and p essures are less than those actually tested, the District c.onsiders that the Chemtrol Corporation differential pressure test nas enveloped the conditions that exist in the Fort Calhoun plant.
Thus, the test results are directly appiicable to our penetration des i gn.
Sincerely, 445 288 E. Short Assistant General Manccer 0
TES/KJM/BJH:cb 00 h}Q cc:
LeBceuf, Lamb, Leioy & Madae
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1333 ;iew Hampshire Avenue, ;1.'J.
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Washington, D. C.
20036 7907 200scW