ML20138N020
| ML20138N020 | |
| Person / Time | |
|---|---|
| Site: | Harris  |
| Issue date: | 12/11/1985 |
| From: | Watson R CAROLINA POWER & LIGHT CO. |
| To: | Grace J NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II) |
| References | |
| REF-PT21-85, REF-PT21-85-508-000 220, HO-850476-(O), PT21-85-508, PT21-85-508-000, NUDOCS 8512230323 | |
| Download: ML20138N020 (4) | |
Text
..
~e s-e L
Cp&L Cylina %er & Light Company f
IIARRIS NUCLEAR PROJECT P. O. Box 165 New 11111, North Carolina 27562 DEC 1 1 1985 File Number:
SHF/10-13510E NRC-404 Letter Number: !!O-850476 (0)
Dr. J. Nelson Crace United States Nuclear Regulatory. Commission Region II 101 Marietta Street, Northwest (Suite 2900)
Atlanta, Georgia 30323 CAROLINA POWER & LIGilT COMPANY SilEARON IIARRIS NUCLEAR POWER PLANT 1986 - 900,000 KV - UNIT 1 STANDBY DIESEL CENERATOR - CONTROL PANEL WIRING, ITEM 220
Dear Dr. Grace:
Attached is our final report on the subject item which was deemed reportable per the provisions of 10CFR50.55 (e) and 10CFR, Part 21 on October 15, 1985. With this report, Carolina Power & Light Company cosiders this matter closed.
If you shotad have any questions concerning this matter, please do not hesitatt to contact me.
Yours very truly, d$
U R. A. Watson Vice President Shearon liarris Nuclear Power Plant RAW:jsb Attachment cc: Messrs. J. M. Taylor (NRC)
C. Maxwell (NRC - SHNPP)
NBI-OSI rd22gggg paggp su S
("
u -w
y CAROLINA POWER & LIGHT COMPANY SHEARON HARRIS NUCLEAR POWER PLANT UNIT 1
. FINAL REPORT CRACKED VENDOR WIRING INSULATION IN DIESEL GENERATOR CONTROL PANELS ITEM 220
-DECEMBER 5. 1985 REPORTABLE UNDER 10CFR50.55(e)
AND 10CFR21 IBMD-WKK006-OS4
'e
%{
SUBJECT:
10CFR50.55 (e) and 10CFR21 Reportable Item Shearon Harris Nuclear Power Plant Unit 1 Wiring in Emergency Diesel Generator Control Panels ITEM:
Diesel Generator Control Panels lA-Sa & IB-SB SUPPLIED BY:
Transamerica Delaval, Inc./ RTE Delta Corp.
NATURE OF DEFICIENCY:
TDI notified CP&L by letter in August, 1985 that the potential exists for cracked wiring in the low level i-circuits of the Diesel Generator Control Panels.
DATE PROBLEM WAS CONFIRMED TO EXIST:
TDI letter to CP&L dated August, 23, 1985 and received August 30, 1985.
Field verification that the problem exists at the Shearon Harris Nuclear Power Plant was confirmed on September 17, 1985.
DATE PROBLEM REPORTED:
CP&L (Mr. K. V. Hate') notified the NRC (Mr. L.
Mellen) that this item was reportable under the provisions of 10CFR50.55(e) and 10CFR21 on October 15, 1985.
SCOPE OF PROBLEM:
Information provided by RTE Delta Corp. indicated that a potential cause of the subject. cracked wiring insulation was from exposure to a petroleum fume environment.
The SHNPP generator control panels are located in isolated control rooms and are not exposed to petroleum fumes.
Investigation revealed that cracked wiring insulation did exist in some low level wiring on both Diese!. Generator Control Panels, IA-SA and IB-SB.
It should be noted that cracking was more prevalent in panel IB-SB.
Since engine 1B-SB has yet to be tested, no fuel oil has been supplied to the building.
e In view of the above, it is CP&L's conclusion that the cracking of the wiring insulation noted was not due to petroleum fumes. Rather, it is our impression that the probable cause was the vulcanization process of the rubber insulation. This conclusion has been transmitted to TDI.
SAFETY IMPLICATIONS: Cracked insulation could lead to short circuits of signal wiring to the diesel engine instrumentation and control circuits rendering the generator speed controls inoperable.
IBMD-WKK006-OS4
7 REASON DEFICIENCY IS REPORTABLE:
Failure of engine speed controls would render the generators-inoperable for supplying emergency power.
i CORRECTIVE I
ACTION:
The defective wiring in both Diesel Generator Control Panels,.1A-SA and IB-SB as identified by Field Change Request-E-5521 R/0 has now been replaced with
- approved on site cable and inspected in.accordance-I with appropriate site procedures. CP&L has requested TDI to examine and replace (if necessary) the cable
- in the remaining two control panels still at the RTE Delta Plant.
This completes corrective action required for this item.
I IBMD-WKK006-OS4