TXX-4774, Interim Significant Deficiency Rept CP-86-10 Re Bunker Ramo Electrical Penetration Assemblies Not in Accordance W/Design Requirements.Initially Reported on 860214.Modules Replaced. Final Rept Will Be Submitted by 860611
| ML20203N223 | |
| Person / Time | |
|---|---|
| Site: | Comanche Peak  |
| Issue date: | 04/24/1986 |
| From: | Counsil W TEXAS UTILITIES ELECTRIC CO. (TU ELECTRIC) |
| To: | Johnson E NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION IV) |
| References | |
| CP-86-10, TXX-4774, NUDOCS 8605050178 | |
| Download: ML20203N223 (3) | |
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h Log # TXX-4774 j
File # 10110 908.1 TEXAS UTILITIES GENERATING 'OMPANY SKYWAY TOWER e 400 NORTH OLIVE I!rTMEET. L.B. 81 AB TEXAS 75301 April 24,
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)h Mr. Eric H. Johnson, Director
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Division of Reactor Safety and Projects U.S. Nuclear Regulatory Commission 611 Ryan Plaza Drive, Suite 1000 Arlington, TX 76012
SUBJECT:
COMANCHE PEAK STEAM ELECTRIC STATION DOCKET NOS. 50-445 AND 50-446 ELECTRICAL PENETRATION ASSEMBLIES SDAR: CP-86-10 (INTERIM REPORT)
Dear Mr. Johnson:
On February 14, 1986, we verbally notified your Mr. T. F. Westerman of a deficiency involving electrical penetration assemblies (EPA's) supplied by Bunker Ramo which may not be in accordance with design requirements. We have submitted an interim report TXX-4733, dated March 17, 1986.
We have concluded that this deficiency is reportable under the provisions of 10CFR50.55(e). We anticipate evaluation of all corrective action and submittal of our final report by June 11, 1986.
Very truly yours, W. G. Counsil JCH/arh Attachment c - NRC Region IV (0 + 1 copy)
Director, Inspection & Enforcement (15 copies)
U. S. Nuclear Regulatory Commission Washington, D.C.
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ATTACHMENT
't ELECTRICAL PENETRATION ASSEMBLIES DESCRIPTION During construction inspection activities, electrical " pigtail" splices were observed in two EPA (Electrical Penetration Assembly) modules which were not staggered as specified in the vendor requirements. The nonconformance report issued to document the conditions was further expanded into a project Corrective Action Request (CAR), as a result of the indeterminate scope of the issue.
The function of an EPA is to seal the containment structure at the point electrical conductors exit the building.
Investigations by site quality and engineering groups has resulted in identification of the following deficiencies involving EPA modules supplied by Bunker Rama:
a)
" Pigtail" splices were not performed in accordance with vendor fabrication documents, b)
Rework of heat shrink cable splice jackets has not be performed as required.
c)
The application of heat shrink cable splice jackets is inadequate.
d)
Exposed conductors have been observed at splices.
e)
The vendor QA program has failed to provide a method to advise the project of required correction.
f)
The QA program has failed to effectively identify items and activities requiring correction.
In order to fully investigation the circumstances resulting in the EPA deficiencies, a project Task Team has been formed.
The conclusions of the Task Team are anticipated in mid-May 1986.
Please note this issue has been specifically reviewed by the NRC per Inspection Reports 445/86-04 and 446/86-03.
The concern is applicable to Units 1 and 2.
SUMMARY
OF EVENTS Date Discovered:
February 13, 1986 per Corrective Action Request 055 Date NRC Notified as Potentially Reportable: February 14, 1986 Interim Report to NRC: March 17, 1986 Date Determined Reportable: April 24, 1986 j
SAFETY IMPLICATION In the event these conditions had remained undetected, the integrity of containment to assure offsite radiological consequences are maintained within specified guidelines could not be assured.
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O CORRECTIVE ACTION g
EPA modules supplied by Bunker Ramo will be replaced.
Engineering and
. procurement activities are currently underway. These efforts and j
construction installation activities will-be completed prior to fuel load.
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Please note, the conclusions of the project' Task Team and the specific construction schedule will be provided in the next report to be submitted no later than June 11, 1986.
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