ML19253C601
| ML19253C601 | |
| Person / Time | |
|---|---|
| Site: | Wolf Creek  |
| Issue date: | 09/11/1979 |
| From: | Koester G KANSAS GAS & ELECTRIC CO. |
| To: | Seidle W NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION IV) |
| References | |
| NUDOCS 7912060562 | |
| Download: ML19253C601 (2) | |
Text
TEC KANSAS GAS AND ELECTRIC COMPANY GLEN N L. MOESTE R vict Patssoth?.optmanons September 11, 1979 Mr. W.C. Seidle, Chief Reactor, Construction and Engineering Support Branch U.S. Nuclear Regulatory Commission Region IV 611 Ryan Plaza Drive, Suite 1000 Arlington, Texas 76012 Re: STN 50-482 Sub: Fire Protection Coating
Dear bk. Seidle:
This letter is to keep you advised regarding our investigations related to the use of ALBI Duraspray fireproofing material at the Wolf Creek Station.
Investigations are being performed to examine alternate methods for removal of fireproofing overspray from stainless steel piping, uhat if any damage to stainless steel piping has resulted from contact with this product, and to evaluate new fireproofing materials which show potential for performing satisfactorily in service and have reduced chloride levels.
The investigations are not complete but preliminary results and conclusions are as follows:
1)
Duraspray can be removed by wet cloths, brushing and/or scrapping, the method (s) required being a function of how long the material has been allowed to set.
After cleaning by these methods, residual chloride concentrations remain. Tests have demonstrated this residual can be removed by nitric acid but other cleaning agents which are easier and safer to handle are being evaluated.
2)
Penetrant tests of the stainless piping which has been contaminated with Duraspray and then cleaned have been pe rformed. The tests show that cracks or other rejectable defects are not present.
3)
Evaluations performed to date of alternate fireproofing materisis indicate that there are new products available G(+,
1509 120 v
g o n oco 201 N. Market - Wichita, Kansas - Mail Address: P.O. Box 208 / Wichita, Kansas 67201 - Telephone: Area Code (316) 2641111
Mr. Seidle September 11, 1979 which appear to provide the required fire rating and which also have reduced amounts of chloride.
Inves-tigations of these materials are continuing.
In summary, we have not detected any damage caused by Duraspray material contacting stainlesr steel pipe; Duraspray can be and will be removed, however, further tests and analysis of Duraspray and potential alternate materials are being made.
It is our preliminary judgment that conditions reportaole under Regulation 10CFR50.55 (e) do not exist.
he will keep you advised if anything develops which changes the above preliminary conclusions. Until investigations of alternate products are complete, we are restricting the use of Duraspray to areas where stainless steel is nc t now and will nc~ be ins talled.
Yours very truly, 11 ih u
701) d GLK:bb i509 121