ML20198D534

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Partially Withheld Assessment of Allegation AQE-41 to Allegation Category Qa/Qc 6, QC Insp Re Worn Gauges Used to Calibr Lighting Restraint Cable Tools Resulting in Incorrect Installation & Issuance of Nonconformance Rept
ML20198D534
Person / Time
Site: Comanche Peak  Luminant icon.png
Issue date: 06/07/1985
From: Curry T, Livermore H
NRC, NRC - COMANCHE PEAK PROJECT (TECHNICAL REVIEW TEAM)
To:
Shared Package
ML20198C597 List: ... further results
References
FOIA-85-517, FOIA-85-59, FOIA-85-89 NUDOCS 8605230320
Download: ML20198D534 (2)
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1. Allegation Category: 0A/QC 6, QC Inspecti'n
2. Allegation Number: AQE-41 l 3. Characterization: It is alleged that gauges used to calibrate lighting restraint cable tools were worn, which resulted in incorrect installa-tion and an issuance of a nonconformance report (NCR).
4. Assessment of Safety Significance: The NRC Technical Review Team (TRT) found eight NCRs written in the first quarter of 1984 that related to light-ing restraint cable compression fittinos. All eight NCRs addressed the out-of-tolerance gauges being used to calibrate the crimping tools which are j

used to attach the restraint cable fittings. Texas Utilities Electric Company quality control (QC) inspectors discovered the worn gauges and wrote the NCRs.

The TRT determined that the NCRs had been dispositioned by a series of 16 tests conducted on identical restraint cables that had fittings attached using the out-of-tolerance crimping tools. In all 16 tests, the test ended when the cable broke, rather than when the fitting failed. Consequently, the eight NCRs were disoositioned "use-as-is," because the strength of the cable restraints was noi affected. The worn gauges were destroyed, and new ones were machined and placed in the calibration laboratory for future use. The out-of-tolerance tools were specialized tools used only for installation of lighting restraint cables.

5. Conclusion and Staff Positions: Based on a review of applicable documen-tation, the TRT concludes that'the allegation that crimp gauges were out-of-tolerance was substantiated. The allegation of incorrect installation was not substantiated. 'The wem gauges were identified by the inspection system, which resulted in special tests that demonstre.ted ndequate strength of the cable restraints. The TRT concludes tha,t the NCRs were properly dispositioned. Additionally, the worn gauges were replaced. While the out-of-tolerance gauges were not discovereo until after they had been used in the field, they were discovered by QC inspectors.

In a meeting with the alleger on December 10, 1984, the TRT discussed the results of this assessment. There were no major items of disagreement and no new concerns or allegations were identified. _

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7. Attachments: None.

Reference. Documents:

1. NCRs: E-84-00597 E-84-00601 E-84-00598 E-84-00602 E-84-00599 E-84-00603 E-84-00600 E-84-00604
2. " Comanche Peak Steam Electric Station (CPSES) Oval 'M' and Oval 'B4' Nicopress Sleeve Capacity Tests Report," attached to Memo CPPA 37,667, dated March 20, 1984.

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3. CPR of installation report during April 3 through 13, 1984, Appen-dix A, inspector A-3.

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8. This statement prepared by: b Tern M 6, [c/(As' T. Curry, TRT (/ Date /

Technical Reviewer Reviewed by: 24atu 9 Herbert Livermore, 6 S[

Date Group Leader Approved by:

Vincent Noonan, Date Project Director f

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