ML20093L202
| ML20093L202 | |
| Person / Time | |
|---|---|
| Site: | Pilgrim |
| Issue date: | 07/11/1984 |
| From: | Hanner J NUTHERM INTERNATIONAL, INC. |
| To: | NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION III) |
| References | |
| REF-PT21-84-367-000 PT21-84-367, PT21-84-367-000, NUDOCS 8407310325 | |
| Download: ML20093L202 (2) | |
Text
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)$O Nutherm&
IN1ERNATIOVAL.IAC j
501 SOUTH ELEVENTH STREET /MT. VERNON ILLINOIS 62664/(618) 244 6000 July 11, 1984 Nuclear Regulatory Commission Region III 799 Roosevelt Road, Bldg. 4 Glen Ellyn, IL 60137 ATTENTION: Director of Region III
SUBJECT:
Nicked Conductors Analog Trip Cabinets Pilgrim Nuclear Power Plant Nutherm International, Inc.
Dear Sir:
In accordance with 10 CFR 21, I am writing to inform you of the delivery of equipment containing a defect to the Pilgrim Nuclear Power Plant of the Boston Edison Company (BECO) by Nutherm International, Incorporated.
On June 21, 1984, Boston Edison Company notified Nuthern that they had found nicked insulation on individual conductors resulting from the jacket stripping of Rockbestos Firewall III single pair shielded cable by Nutherm. The jacket stripping was performed at Nutherm's Mt. Vernon, Illinois, plan t during August, 1983, while manufacturing Analog Trip Cabinets for the Pilgrim Scram Discharge Volume system.
i Cabinets affected at Pilgrim are equipment numbers
- C2228A1, C2228A2, C2229B1, and C2229B2.
On June 26, 1984, a Nutherm Quality Assurance Engineer arrived at Pilgrim.
With the assistance of BECO personnel, he performed 100% inspection of the conductors.
It was found that 264 of 672 conductor ends were nicked.
During the period ending July 2, 1984, all cables containing the nicked conductors were replaced by Boston Edison Company.
The work was witnessed by Nutherm's QA Engineer.
l On July 11, 1984, Nutherm was informed verbally by BECO that a situation could be hypothesized; involving a ground through resistance; that could be considered adverse to safety, had the problem gone undetected.
Other Analog Trip Cabinets containing Rockbestos jacketed cable have been delivered to Commonwealth Edison Company's Quad Cities Units 1 and 2 and Dresden Units 2 and 3.
On July 10, 1984, a Nutherm QA Engineer inspected 100% of the conductors in the Quad Cities cabinets.
Only 5 nicked conductors were found during inspection of the 176 conductor ends.
The 5 cables containing nicked conductors were replaced by CECO personnel and witnessed by Nutherm's QA Engineer.
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1 July 11~, 1984
- Page 2.of 2' LNutherm. requested ~ to inspect at Dresden July 11, 1984. CECO indicated that inspection at; Dresden was not possible this week' but ~that ;it would-be scheduled as soon as'possible.
Affected cabinets at Commonwealth' Edison's plants are as.follows:
. Quad Cities 1 2201-73A, 2201-73B Quad Cities 2 2202-73A,.2202-73B Dresden 2' 2202-73A, 2202-73B
^
- Dresden 3 2203-73A, 2202-73B None fofl'the affected cabinets ' at the five plants have. been placed in.
se rvice. - The. problem has been corrected at three units and will be corrected-at the'two Dresden units as soon as-CECO schedules the. inspection.
The root cause of the problem was inexpertence with. jacketed' cable and lack -
4 of training for QA inspection personnel covering the stripping aspect of cable dressing.
Remedial corrective action is being accomplished by on-site cable i
replacement.
I.
Generic corrective action has been completed at Nutherm.
A new cable jacket stripping procedure has been written and training has been conducted. On any future jobs involving jacketed cable, QA will assure the shop personnel and inspectors assigned have been trained to the procedure..
In' summary,- a cable dressing defect was found in Nutherm equipment i
potentially affecting five plants.
None of the equipment was in. service. Quick and effective corrective action has been implemented.
T It is hoped the condition is adequately explained and. that our corrective
. action will'be considered appropriate.
Sincerely, NUTH RM INTERNATIONAL,
[NC. -
j i*
Jamed S. Hanner Executive Vice President
.JSH/dms cc: Brian Viehl Commonwealth Edison 2
Hawley Brannon Boston Edison Company.
Ronald J. Heifner Nutherm International, Inc.
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