ML20031A874
| ML20031A874 | |
| Person / Time | |
|---|---|
| Site: | Perry  |
| Issue date: | 09/18/1981 |
| From: | Davidson D CLEVELAND ELECTRIC ILLUMINATING CO. |
| To: | James Keppler NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION III) |
| References | |
| 10CFR-050.55E, 10CFR-50.55E, RDC-35(81), NUDOCS 8109280328 | |
| Download: ML20031A874 (2) | |
Text
f r
. k4
)
[ $ [
A P O BOX 5000 e CLEVELANo. oHlo 44101 e TELEPHONE (216) 622-9800 m ILLUMIN ATING BLDG e 55 PUBLic SOUARE
- 9
- '0 " I' " '" #
Dalwyn R. Davidson vlCE PRESIDENT kl l w
SYSTE M ENGINEEAiNG AND CONSTRUCTION g
September 18, 1981,9 Scfg - Q, PN7 4< %c V(o (P
o 1.
~
Q
!'/,
a t
Mr. James G. Keppler
[N,',ci-Q)-)
Office of Inspection and Enforcement y,E/.N Director, Region III U
c 799 Roosevelt Road
'^
~
Glen Ellyn, Illinois 60137 Y'/.
d
N/ g, l,. s \\,/
RE:
Nrry Nuclear Power Plant Docket Nos. 50-440; 50-441 Interim Report on Rockbestos Coaxial Cable, Series RSS-6-100 through RSS-6-112
[RDC 35(81)]
Dear Mr. Keppler:
This letter serves as an interim report pursuant to 10CFh50.55(e) concerning potential failure of solid dielectric coaxial cable supplied by the Rockbestos Company.
Initial notification relative to this report was made to Mr. Leonard McGregor of your office by Mr. William Kacer of The Cleveland Electric Illuminating
ompany on August 20, 1981.
This report includes a descript. ion of the deficiency, an analysis of the safety implications, and the planned corrective action.
Description of the Deficiency Rockbestos Company is supplying Class 1E coaxial cable with both solid and cellular dielectric construction for use at the Perry Nuclear Power Project.
This letter addresses a deficiency pertinent only to coaxial cable with solid dielectric construction - Rockbestos series RSS-6-100 through RSS-6-112.
Potential failure of this type coaxial cable was first identified by a Rockbestos customer during a laboratory tast.
Through subsequent testing and evaluation, Rockbestos has determined that thermal expansion of the braided shield, solid diele-tric and insulated conductor causes intermittent buckling and kinking of the cable at temperatures of 230 degrees Fahrenheit and above.
Further, the high temperature and kinking results in thermal strens cracking of the conductor insulation potentially allowing the conductor to make contact with the cable shield creating a short circuit.
NO s
//o 8109280328 510918
'SEP g 1 g PDR ADOCK 05000440 PDR g
Mr. Jcces G. Keppler September 18, 1981 Analysis of Safety Implication The Rockbestos solid dielectric cable is intended for use as Class IE instru-mentatton cable at the Perry Nuclear Power Project. During an accident condition, the cable could be subject to temperatures equal to or exceeding the temperature at which laboratory f ailure has been reported.
Postulated subsequent failure of this cable would result in loss of essential containment monitoring capability.
Planned Corrective Action After receipt of notification that Rockbestos was investigating a reported laboratory test failure on their RSS-6-104 coaxial cable, initial actions were taken. These actions included verification that none of the typc RSS series 100 cable had been released for installation, and initiation of Nonconformance Report P033-0079 to document the indeterminate qualification status. Currently, this cable is on hold in our cable storage yard and will be returned to Rockbestos.
Rockbestos subsequently corfirmed laboratory test failure of their solid dielectric coaxial cable in their letter dated July 30, 1981.
This letter advises that they have initiated a qualification program for new cable being manufactured with a design modification in the braided shield construction.
This modified cable is being offerred as a replacement for the original cable. Projected completion date of its qualification program is November 15, 1981.
Pending acceptance of the Rockbestos qualification report, we are planning to file our final report on this subject by January 22, 1982.
Very truly yours, h'
4 1
Dalwyn. Davidson Vice President System Engineering and Construction DRD:pab cc:
NRC Site Of fice Mr. Victor Stello, Director Office of Inspection and Enforcement U.S. Nuclear Regtilatory Commission Washington, D.C.
20555 U.S. Nuclear Regulatory Commission c/o Document Management Branch Washington, D.C.
20555
-