ML19338G215

Forwards Response to NRC 800926 Lr Re Violation Noted in IE Insp Repts 50-566/80-14 & 50-567/80-14.Corrective Actions: Review of Concrete Test Dispositioned in Qcir 51057 Showed Design Strength Should Be Realized at Later than Design Age

ML19338G215
Person / Time
Site:	Yellow Creek
Issue date:	10/21/1980
From:	Mills L TENNESSEE VALLEY AUTHORITY
To:	James O'Reilly NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II)
References
NUDOCS 8010280611
Download: ML19338G215 (2)

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400 Chestnut Street Tower II October 21, 1980 Mr. James P. 'Reilly, Director.

Office of Insp tion and Enforcement U.S. Nuclear Re atory Commission Region II - Su.'.te 100 101 Marietta Street Atlanta, Georgia 303 '

Dear Mr. O'Reilly:

YELLOW CREEK NUCLEAR PLANT UNITS 1 AND 2 - NRC-0IE REGION II LETTER RII:JRH 50-566/80-14 AND 50-567/80 INSPECTION REPORT - RESPONSE TO INFRACTION The subject dated September 26, 1980, cited TVA with one infraction in accordance with 10 CFR 2.201. Enclosed is our response.

If you have any questiens concerning this matter, please get in touch with D. L. Lambert at FTS 857-2851.

Very truly yours, TENNESSEE VALLEY AUTHORITY L. M. Mills,-Manager Nuclear Regulation and Safer / -

Enclosure cc: Mr. Victor Stello, Jr., Director (Enclosure) /

Office of Inspection and Enforcement U.S. Nuclear Regulatory Commission Washington, DC 20555-

$o/7 s.

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ENCLOSURE YELLOW CREEK NUCLEAR PLANT UNITS 1 AND 2 RESPONSE TO INFRACTION 50-566/80-14-01 AND 50-567/80-14-01 Infraction As required by Criterion XI of Appendix B to 10 CFR 50, and implemented by PSAR Section 17.1 A.17, " Test results shall be evaluated to assure that test requirements have been satisfied."

Contrary to the above, thirteen percent of test cylinders for concrete class 401.5 AFW have broken below the specified strength and no Q;IR has been issued 1or has an evaluation of the questionable results been made.

Corrective Action Taken and Results Achieved QCIR 51057 was written and an evaluation was performed by the Yellcw Creek materials engineer. The evaluation was conducted according to General Construction Specification G2, " Plain and Reinforced Concrete." This evaluation disclosed that the mix designs for each affected strength class required minor mix adjustments. In addition, the evaluation indicated that a procedural change was needed to ascertain that the cylinder test data were being tracked and evaluated. The materials engineer made the appropriate mix changes resulting in a lower failure rate which will bring the overall percentage back within the acceptable 10 percent limit.

Finally, a review of the concrete test dispositioned in QCIR 51057 revealed that the design strength should be realized at a later than design age but before the concrete is subjected to their design stresses.

Corrective Steps Which Will Be Taken to Avoid Further Noncompliance To prevent further recurrence, QCI 209 (Concrete Strength Testing) will be revised in order to clearly define the requirements for the materials engineer to write a QCIR for each test that fails in accordance with procedure C 7 15.01.

The materia; s engineer will be reinstructed in these procedures.

Date When Full Compliance Will Be Achieved We expect to be in full compliance by December 1, 1980.

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