ML20112F552
| ML20112F552 | |
| Person / Time | |
|---|---|
| Site: | Harris  |
| Issue date: | 12/12/1984 |
| From: | Parsons R CAROLINA POWER & LIGHT CO. |
| To: | James O'Reilly NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II) |
| References | |
| CON-NRC-302 176, NUDOCS 8501150404 | |
| Download: ML20112F552 (4) | |
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UtiNFC PISI A T L A.'. T A.
E Carolina Power & Light Company 8 <l D E C 17 #$+~l " -
P. O. Box 101, New Hill, N. C. 27562 December 12, 1984 Mr. James P. O'Reilly NRC-302 United States Nuclear Regulatory Commission Region 11 101 Marietta Street, Northwest (Suite 2900)
Atlanta, Georgia 30323 CAROLINA POWER & LIGHT COMPANY O-Q(6k SHEARON HARRIS NUCLEAR POWER PLANT 1986-900,000 KW - UNIT 1 ELECTRIC CABLES - HI-POT TEST FAILURE, ITEM 176
Dear Mr. O'Reilly:
Attached is our final report on the subject item which was deemed reportable per the provisions of 10CFR50.55(e) on June 19, 1984. With this report, Carolina Power & Light Company considers this matter closed.
If you have any questions regarding this matter, please do not hesitate to contact me.
Yours very truly, W
R. M. Parsons Project General Manager Completion Assurance Shearon Harris Nuclear Power Plant RMP/rt Attachment cca Messrs. G. Maxwell /R. Prevatte (NRC-SHNPP)
Mr. R. C. DeYoung (NRC) hD OC 0
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SHEARON HARRIS NUCLEAR POWER PLANT UNIT NO.1 FINAL REPORT ELECTRIC CABLES HI-POT-TEST FAILURE ITEM 176 DECEMBER 12,1984 REPORTABLE UNDER 10CFR50.55(e)
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SUBJECT:
Shearon Harris Nuclear Power Plant, Unit No.1,10CFR50.55(e) reportable deficiency.
Single conductor power cables were
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damaged during installation but not detected by inspection and testing.
ITEM: '
Single conductor 600V. power cable
? SUPPLIED BY:
The Kerite Company,49 Day Street, Seymour, Connecticut 06483
- NATURE OF DEFICIENCY:
Cables ll755A-SB and 11755B-5B were installed in accordance with documented design requirements, site installation procedures, i
and accepted based on inspection procedures. However, due to a low initial megger reading in one of the phases in each of the two H
(2) three-single conductor 500 MCM parallel feeder circuits, the cables were, suspect and additional -testing, not required by procedures'or design documents, was' performed. As a result of additional high-potential testing, cable damage was detected in both circuits.
I DATE PROBLEM
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' OCCURRED:
May 10,1984
- DATE PROBLEM WAS REPORTED
- :
On' June 19, 1984, CP&L (Mr. K. V. Hate') notified the NRC (Mr.
A.' Hardin) that this item was reportable per the provisions of 10CFR50.55(e).
SCOPE OFl PROBLEM:
The' scope of the problem, initially unknown, was found to be isolated to the two parallel feeder circuits,11755A-SB and 11755B-SB, in~which one of the three 1/C-300 MCM ~ cables in each circuit was damaged.
An; investigation:of the. two failed cables showed
_.that damage occurred at the same location in the raceway. We are confident the damage occurred during installation, but the exact cause could not be determined.
SAFETY
' IMPLICATION: -.
If undetected damage occurred to safety-related cables, failure could occurL resulting in^ a lossL of n power to safety-related -
equipment.
REASON-
~ DEFICIENCY 15 f
HP51tTATEET
' This is a reportable deficiency since the possibility existed that
' safety related power cables which have been installed, inspected, and accepted in accordance with design = requirements and site -
procedures could be damaged and fail when put in service.
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. i CORRECTIVE -
ACTION:
The two (2) parallel feeder circuits in which one of the three-single conductor 500 MCM cables was found damaged were replaced. Both circuits were satisfactorily meggered and high-potential tested following installation.
An effort was made to identify safety related single conductor 500 MCM power cables installed as of May 22, 1984. Additional high-potential testing approved by Harris Plant Engineering p-r FCR-E-2573 was then performed on these cables and the results were satisfactory. In addition to 500 MCM power cable testing, other safety and non-safety single conductor power cables installed as of May 22, 1984 were randomly selected and subjected to high-potential testing to confirm cable jacket /insulatica integrity and were also found to be satisfactory.
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' PREVENTIVE' MEASURES:
. Cor:struction Work Procedure WP-209. General Meggering and Hi-Potting Procedure for Equipment and Cable was revised on August 23,1984 to incorporate a requirement that the Electrical Discipline Engineer be notified when installed cables exhibit low initial megger readings and/or when a difference of 300% or more in megger readings exists between conductors in a. cable.
The Electrical Discipline Engineer will be responsible for investigating the problem to determine the cause and
- provide an acceptable resolution.
Construction Work Procedure WP-210, installation and Termination of Safety Related Wire <ind Cable was also revised on August 23,1984 to incorporate that the Electrical Discipline Engineer, Electrical Superintendent, or Construction Inspector may request a megger or a
. high-potential test before cable removal from a reel to insure cable
- integrity prior to pulling.
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