ML20205P719
| ML20205P719 | |
| Person / Time | |
|---|---|
| Site: | Harris  |
| Issue date: | 05/08/1986 |
| From: | Watson R CAROLINA POWER & LIGHT CO. |
| To: | Grace J NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II) |
| References | |
| CON-NRC-444 162, HO-860289-(O), NUDOCS 8605210538 | |
| Download: ML20205P719 (4) | |
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Cp&L Carolina Power & Light Company I (.
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~w HARRIS NUCLEAR PROJECT P. O. Box 165 New Hill, NC 27562 May 8, 1986 File Number:
SHF/10-13510E Letter Number: HO-860289 (0)
Dr. J. Nelson Grace NRC-444 United States Nuclear Regulatory Commission Region II 101 Marietta Street, Northwest (Suite 2900)
Atlanta, Georgia 30323 CAROLINA POWER & LIGHT COMPANY SHEARON HARRIS NUCLEAR POWER PLANT 1986 - 90,000 KW - UNIT 1 i
FIRE BARRIERS - TACK WELDS, ITEM 162
Dear Dr. Grace:
Attached is our fifth interim report on the subject item, which was deemed reportable per the provisions of 10CFR50.55(e) on March 14, 1984. CP&L is pursuing this matter, and it is currently projected that corrective action and submission of the final report will be accomplished by July 3, 1986.
Thank you for your consideration in this matter.
Yours very truly, Raakt-~
R. A. Watson Vice President Harris Nuclear Project RAW:bwh Attachment cc: Messrs. C. Maxwell (NRC-SHNPP)
J. M. Taylor (NRC)
NBI-OS1 8605210538 860508 PDR ADOCK 05000400 S
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CAROLINA POWER & LICHT COMPANY SHEARON HARRIS NUCLEAR POWER PLANT i
UNIT 1 3
FIFTH INTERIM REPORT I
J FIRE BARRIERS - TACK WELDS ITEM 162 1
MAY 8, 1986 REPORTABLE UNDER 10CFR50.55(e)
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SUBJECT:
Shearon Harris Nuclear Power Plant, Unit No. 1, 10CFR50.55(e) reportable deficiency.
Inadequate Tack Welds in Fire Barrier.
ITEM:
Tack welds are required for structural support of fire barrier panels but were not inspected.
SUPPLIED BY:
Not a supplier-related deficiency.
NATURE OF DEFICIENCY:
The subject fire barrier panels consist basically of a fireproof material applied to both sides of expanded metal. The attachment of the panels to structural steel is by tack welds. Original design did not specify number or location of tack welds; therefore, tack welds were not considered structural and inspection was not required.
In some areas where the fireproofing material was removed for reinspection, tack welds were found to have broken.
DATE PROBLEM OCCURED:
Prior to February 1, 1984.
DATE PROBLEN REPORTED:
On February 13, 1984, CP&L (Mr. N. J. Chiangi) notified the NRC (Mr. A. Hardin) that this item was potentially reportable per provisions of 10CFR50.55(e).
On March 14, 1984, CP&L (Mr. N. J. Chiangi) notified the NRC (Mr. A. Hardin) that the tem was reportable per 10CFR50.55(e).
SCOPE OF PROBLEM:
The fire barrier bottom panels were installed prior to the tack welds being identified as a problem so they are all suspect, and since the fire protective coating has been applied, the tack welds are not accessible for reinspection / rework. The fire barrier panels are located in the Cable Spread Room and Auxiliary Control Panel Room.
u SAFETY IMPLICATION:
The fire barrier separates redundant Cable Trains SA and SB.
The tack welds do not affect the fire protection properties of the panels, but the fire
. barrier is seismically designed, and failure of'the tack welds could allow the panels to drop down onto safety-related cable and equipment beneath.
Engineering evaluation has determined there is a safety concern for one section of cable tray in the Cable Spread Room, and the panels which are over the Auxiliary Control Panel and a section of cable tray in the Auxiliary Control Panet Room.
CORRECTIVE ACTION:
The sections of cable tray where there is a safety i
concern will be protected by covers. These covers cannot be put in place until cable associated with the affected trays has been installed. The design of the cable tray covers is now complete and installation of the subject cable tray covers is now anticipated to be complete by June 30, 1986.
The Auxiliary Control Panel will be protected by providing structural support for the section of panel which could potentially damage it.
Design of this support and its installation are now complete.
FINAL REPORT:
A final report will be issued once the corrective action described above is complete.
It is currently projected that a final report will be issued by July 3, 1986.
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