ML20099B428
| ML20099B428 | |
| Person / Time | |
|---|---|
| Site: | Cooper  |
| Issue date: | 07/29/1992 |
| From: | Horn G NEBRASKA PUBLIC POWER DISTRICT |
| To: | NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM) |
| References | |
| IEB-92-001, IEB-92-1, NSD920759, NUDOCS 9207310155 | |
| Download: ML20099B428 (3) | |
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c NSD9207$9 July 29, 1992 U.S. Nuclear Regulatory Conaission Attention:
Document Control Dest Washington, DC 20555
Subject:
Response t o Imc bullet in tio, 92-01 Cooper Nuclear Station NRC Docket No, 50-298/DPR-46 Reference.
NRC Eulletin No.
92 01, "railure of Thermo-Lag 330 Fire Barrier System to finintain Cabling in Wide Cable Trays and Small Conduits Free from Fire Damage" Centlemen:
As directed by the referenced bulletin, the Nebraska public Power District (Dist rict) is providing the following information regarding Thermo-Lag 330 fire barrier installations at Cooper Nuclear Station (CNS),
CNS currently utilizes Thermo Lag 330 n.atetial as a one hour fire barrier to protect a 2" diamet er conduit in the 882' elevation of the control Building. The conduit contains cabling that provides DC power to Ntunber 1 Onergency Diesel Cenerator and is utilized for post. fire safe shutdown outside of the control Room, in this same fire area, Thermo lain is also utilized for the construction of a one hour barrier enclosure around cabling in conduits that provide 4160 VAC to Station Service Water Pumpr. It should be noted that these configurations of Thermo laig material are of indeterminate status based on the test data supplied in the NRC Bulletin.
'l h e same material in used in other locations at CNS; however, these inctallutons are not credited as one hour or three hour barriers and, therefore, are not within the scope of NRC Dulletin 92 01, In accordance with station procedures, an operability determination was made and it was determined that the two above described barriers were inoperable because of the procedural prohibition against indeterminate operability status.
This resulted in the issuance of a Nonconformance Report and the subsequent reportability analysis determined that the station was outside of its design basis due to the undefined fire barrier rating.
A one hour report was made in accordance with 10 CPR 50.72, Wit hin one hour of the operabilit y det ermination, a continuous firewatch was placed in the 882' elevation of the CNS Control building in accordance with plant Technical Specifications and station procedures.
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NSD920759 Page 2 of 3 in addition to the actions taken above, appropriate actions to restore fire barrier operability are being developed through an industry program being coordinated by NUMARC.
This program will include establishment of a test database, development of guidance for applicability of tests, development of generic installation guidsnee, and consideration and coordination of additional testing as appropriate. The District will inonitor the progress of this prograrn and will review the results of these efforts, when completed, and implement the appropriate corrective actions.
The compensatory measures described or some other compensatory measure approved by the NRC, will remain in place until the one hour rated barriers are restored to operable status.
If you have_any questions regarding this response, or require any additional information, please contact me.
Sincerely,
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Ilorn Nu 4r Power
-Group Manager CRil/dnm cc:
U.S. Nuclear Regulatory Commission Region IV
' Arlington, TX-NRC Resident Inspector Cooper _ Nuclear Station-l lr i
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NSD920759 4
Page 3 of 3 STATE OF NEBRASKA)
)
PIATTE COUNTY
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G. R. llorn, being first duly sworn, deposes and says that he is an authorized representative of the Nebraska Public Power District a public corporation and political subdivision of the State of Nebraska; that he !s duly authorized to submit this response on behalf of Nebraska Public Power District; and that the statements contained herein are true to the best of his knowledge and belief.
I m.
. R. llorn b
Subscribed in my presence and sworn to before me this _ d _ day of
\\d,
1992.
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%08 mate *Aug.E,INI NOTARY PUBLIC
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