TXX-6509, Interim Deficiency Rept CP-85-50 Re Cable Tray Tee Fittings. Initially Reported on 851206.Listed Steps Taken to Establish Min Weld Criteria & Acceptability of Installed Component Weld.Next Rept Will Be Sent by 870930
| ML20215A688 | |
| Person / Time | |
|---|---|
| Site: | Comanche Peak  |
| Issue date: | 06/12/1987 |
| From: | Counsil W TEXAS UTILITIES ELECTRIC CO. (TU ELECTRIC) |
| To: | NRC OFFICE OF ADMINISTRATION & RESOURCES MANAGEMENT (ARM) |
| References | |
| CP-85-50, TXX-6509, NUDOCS 8706170035 | |
| Download: ML20215A688 (2) | |
Text
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Log # TXX-6509
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File # 10110 h
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Ref # 10CFR50.55(e) 1 1UELECTRIC William G. Counsil Decutwe Vice Presi&nt U. S. Nuclear Regulatory Commission Attn:
Document Control Desk Washington, DC 20555
SUBJECT:
COMANCHE PEAK STEAM ELECTRIC STATION (CPSES) l DOCKET NOS. 50-445 AND 50-446 i
CABLE TRAY TEE FITTINGS SDAR: CP-85-50 (INTERIM REPORT) i Gentlemen:
1 On December 6,1985, we verbally notified your Mr. H. S, Phillips of a deficiency involving the use of improper welding processes in the i
manufacturing of cable tray tee fittings which could affect the equipment qualification.
This is an interim. report. of a potentially reportable item under the provisions of 10CFR50.55(e). Our latest report, logged TXX-6413, was submitted April 28, 1987.
As stated in previous reports, a testing program is being conducted to complete our assessment of this issue.
To establish and demonstrate minimum weld requirements and to determine whether weld conditions of installed components are acceptable, w! have initiated the following steps.
1)
The minimum wek that is considered acceptable, based on calculation, for each " Tee" fitting configuration (size) has been identified on Dawings. A model representing the minimum weld requirements has been tested and the results are currently being i
evaluated.
1 i
2)
A field survey is currently underway to determine existing weld conditions, with respect to " Minimum Weld Requirements" specified l
in step 1.
" Tee" sections installed in the field which are found to have insufficient ~or deficient welds, (i.e., not in accordance 1
with calculations above) will be repaired.
Final acceptance of the repairs is contingent upon the test results evaluation above.
There are a total of two hundred twenty (2 0) " Tee" fittings in Unit 1 and one hundred twelve (112) " Tee" fittings in Unit 2, which are affected by this issue.
A fraction of the two hundred twenty (220) fittings in Unit I were covered by thermolag and the thermolag was removed to permit access for inspection and repair of welds as necessary.
B706170035 870612 PDR ADOCK 05000445 q
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TXX-6509 June 12, 1987 j
Page 2 of 2 The work has not been completed yet, however, repair of " Tee" fitting welds has been accomplished for one hundred (100) of the two hundred twenty (220) Unit 1 fittings and twenty-eight (28) of the one hundred twelve (112) Unit 2 fittings.
We had previously stated that the field survey would identify " Tee" sections with " worst" case weld conditions to be tested.
Considering the extensive j
effort required. we have decided not to test a " worst" case model.
Our reoortability assessment will evaluate those existing Tee" sections which do not meet the requirements specified in step 1.
In addition, installation of additional " Tees" has been deferred until our evaluation of this issue is complete. Any " Tees" installed in the future will be required to meet established weld requirements.
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We will submit our next report by September 30, 1987.
i Very truly yours, h
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W. G. Counsil RSB/gj c - R. D. Martin, Region IV Resident Inspectors, CPSES (3)