ML20052E491
| ML20052E491 | |
| Person / Time | |
|---|---|
| Site: | Clinton  |
| Issue date: | 05/04/1982 |
| From: | Gerstner W ILLINOIS POWER CO. |
| To: | James Keppler NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION III) |
| References | |
| 10CFR-050.55E, 10CFR-50.55E, 82-03, 82-3, U-0471, U-471, NUDOCS 8205110153 | |
| Download: ML20052E491 (4) | |
Text
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/LLIN0/S POWER 00MPANY JgCF 678 CLINTON POWER STATION, P.O. BOX 39K CLINTON, ILLINOIS 61727 May 4, 1982 ex f,
Mr. James C. Keppler s,Y
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g Director, Region III 3
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Office of Inspection & Enforcement KVpp U.S. Nuclear Regulatory Commission
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799 Roosevelt Road
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%q y""p Glen Ellyn, IL 60137
Dear Mr. Keppler:
g Deficiency 82-03 10CFR50.55(e)
Ground Faults Occurring in Instrument Cable Due to Termination Splice Practices on March 16, 1982, Illinois Power notified Mr. H. Wescott, NRC Region III (ref:
IP memorandum Y-7725 dated March 16, 1982) of a potential reportable deficiency per 10CFR50.55(e) concern-ing intermittent shorts to ground occurring in instrument cable due to method of termination and tape practices.
On April 16, 1982, Illinois Power submitted an interim report (ref:
IP Letter, U-0462, dated April 16, 1982) to NRC Region III informing you that we anticipate that we will need approximately ninety (90) days to complete an investigation of this matter.
This letter supplements our last interim report of April 16, 1982 and provides additional background information concerning our investigation.
Background
During generic testing for the 1CD031 instrument loop, Illinois Power test personnel encountered fuses which continued to blow for the circuit under test.
Investigation revealed that cables 1CD78B and 1CD78N in panel 1PA08J were shorted to their shield.
These circuits were part of the condensate system which is non-safety related.
Upon unwrapping the tape on the shorted cable, it was found that the splice joining the tape on the shield drain wire to the extension wire had pushed through the conductor insulation and was shorting the conductors to ground (See attached sketch).
Further investigation revealed three other control circuits had the same problem.
One case resulted in damage to a bistable device in panel 1PA08J.
This occurrence was documented on CPS Condition 8205110153 020504
'MAY 7 E6Z PDR ADOCK 05000461 S
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James C. Keppler May 4, 1982 NRC Page 2 Report 1-82-03-002, dated March 1, 1982 by Illinois Power Startup personnel.
On March 2, 1982 Baldwin Associates issued Stop Work Action 011 stopping work on terminations of all-two, three, four, eight, sixteen and twenty-four conductor, 16 AWG, 300 volt IE instrumentation cable.
This Stop Work was issu'ed as a result of shorting problems associated with the methodology of terminating cables per S&L Specification K-29P9.
Baldwin Associates initiated NCR 6507 which restated the conditions documented on CPS Condition Report 1-82-03-002.
Preliminary investigations have revealed that six (6) terminated lE instrument cables may be affected by the suspect termination / taping practices.
These cables are 1DC01G, 1DC03G, IFC01D, 1FC02D, lHP01D and lHP02F.
Evaluation and further investigation is continuing in order to determine the' significance and reportability of this matter.
We hope this supplemental letter provides you sufficient background information to perform a general assessment of this potential reportable deficiency.
We expect to complete our evaluation and investigation within ninety (90)' days and will advise you of the results.
Very truly yours, 4
W.C. Gerstner Executive Vice President cc:
NRC Resident Inspector Director-Quality Assurance Illinois Department of Nuclear Safety Director, Office of I&E, Washington, D.C.
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I I
TERMINATION OF TAPE-SHIELD DRAIN NIRE 1.
" SCOPE 1.1 This standard contains instructions for the termination of the drain wire associated with the tape-shield of control or instruments *: ion cables.
2.
PURPOSE The purpose 'of this standard is to provide a method of terminating each drain 2.1 wire (D/W) in a neat and acceptable manner which will prevent inadvertant grounding or shorting.
3.
METHODS 3.1 Each D/W termination shown on a construction drawing shall be terminated by using a parallel splice and pre-terminated insulated lead wire as indicated in the following details.
Tape shield Insulatiors or tape-shield -
Shielded wires insulated side [
_f
[
Tor termination
> refer to STD-EA-205 Insul'acion (No t e '-3 )
- --2-1/2" -
(
Mini.um Drain Wire
\\ Pre-terminated (D/W) lead vire Cut off (Note 1)
Non-5sulated treesa Parallel Splice D/W (Note 2)
DETATL 1 Individual Wire Group (2/C, etc.) D/W NOTE 1 - The 10" pre-terminated Icad wire shall be 418 AWG tinned copper with Class B stranding. The insulation shall be 600V cross-linked polyethylene (Type SlS) or "Tefzel" and colored solid yellow.
The lead wire shall be
' trimmed before installation so that the shielded conductors are shielded until nearing their termination points.
hf0TE 2 - The non-insulated parallel splice shall be as furnished by AMP (Cat.
No.
34137 and cri:nped with the AMP Ratchet Tool Cat. No. 49900), Thomas & Betts (Cat. No. BlB and cri= ped with the T&B Ratchet Tool Cat. No. k~r-3155), or equal splice crimped with the ratchet crimping tool reco'mmended by the splice manufacturer.
NOTE 3 - The insulation shall be either heat shrinkable tubing or flexible plastic
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insulation tubing and shall capture the tape shield and the lead wire
, insulation.
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NOTE 4 - The insulation shall be either heat shrinkable tubing or tape and shall
'c'apttir'e" the cable jacket tape-shield and lead wire insulation.
NOTE 5 - Drain wire termination kits composed of pre-terminated lead wires, parallel splices and' insulation tubing may be available from AMP.
T*Pe-ahteld 3
Cable or wire groupe Jacket For termination
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re, to s p tA-205
~b 1...taa.. J o
- D.**. 9 1/2*-
Draia Wire 1
(D/V)
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Fre-ea rminat ed cut off lead wire Non-insulated E.neese (soce 1)
Parallel splice D/w (Note 2)
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DETAIL 2 Overall. Shield-D/W O
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