ML20132F660

Responds to NRC Re Violations Noted in Insp Repts 50-327/85-16 & 50-328/85-16.Corrective Actions:Temporary Change Made to Surveillance Instruction 82 to Add Ref to 10 Time Delay & Personnel Retrained

ML20132F660
Person / Time
Site:	Sequoyah
Issue date:	07/03/1985
From:	Domer J TENNESSEE VALLEY AUTHORITY
To:	Grace J NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II)
References
NUDOCS 8508020336
Download: ML20132F660 (3)

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3 7.~ r TENNESSEE VALLEY AUTHORITY CH ATTANOOGA. TENNESSEE 374o1 400 Chestnut Street Tower II cn July 3, 1985 #

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U.S. Nuclear Regulatory Commission F' Region II #

ATTN: Dr. J. Nelson Grace, Regional Administrator 101 Marietta Street, NW, Suite 2900 L Atlanta, Georgia 30323 ,,

Dear Dr. Grace:

p SEQUOYAH NUCLEAR PLANT UNITS 1 AND 2 - NRC-OIE REGION II INSPECTION REPORT 50-327/85-16 AND 50-328/85 RESPONSE TO VIOLATION Enclosed is our response to D. M. Verrelli's June 4, 1985 letter to H. G. Parris transmitting IE Inspection Report Nos. 50-327/85-16 and 50-328/85-16 for our Sequoyah Nuclear Plant which cited TVA with one Severity Level V Violation.

If you have any questions, please set in touch with R. E. Alsup at FTS 858-2725.

To the best of my knowledge, I declare the statements contained herein are complete and true.

Very truly yours, TENNESS VALLEY AUTHORITY J. A. Domer, Chief Nuclear Licensing Branch Enclosure cc: Mr. James Taylor, Director (Enclosure)

Office of Inspection and Enforcement U.S. Nuclear Regulatory Commission Washington, D.C. 20555 8508020336 850703 PDR ADOCK 05000327 G PDR An Equal Opportunity Employer ) I

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RESPONSE - NRC-0IE INSPECTION REPORT NOS.

50-327/85-16 AND 50-328/85-16 D. M. VERRELLI'S LETTER TO H. G. PARRIS DATED JUNE 4, 1985 Violation 50-327, 328/85-16-01 Technical Specification 6.8.1 requires that written procedures be established, implemented and maintained covering activities referenced in Appendix r. of Regulatory Guide 1.33, Revision 2, February 1978. Paragraph 8 of Appendix A of Regulatory Guide 1.33 requires specific procedures for surveillance tests.

Surveillance Instruction SI-82 was established to conduct surveillance activi-ties on radiation monitors.

Contrary to the above, as of April 4, 1985, Surveillance Instruction-82 was not adequately established and was not implemented in that:

1. Testing of radiation monitor RM 90-101 was conducted without the monitor functions blocked as required by this procedure. This resulted in an unnecessary auxiliary building isolation.

2. The procedure does not incorporate technical information concerning circuit behavior af ter incorporation of time delay modifications to the radiation monitor circuitry. This contributed to the unnecessary auxiliary building isolation.

This is a Severity Level V violation. This violation applies to both units (Supplement I).

1. Admission or Denial of Alleged Violation TVA admits that the violation occurred as stated.

2. Reason for Violation The Sequoyah Nuclear Plant (SQN) Surveillance Instruction (SI)-82 provides the test procedure for verifying radiation monitor RM-90-101 (Auxiliary Building stack radiation monitor) . The SI provides the steps required to properly block the monitor channel being tested to prevent inadvertent Auxiliary Building isolation (ABI) .

The violation occurred because a 10-second time delay had been added to the ABI circuit but was not referenced in SI-82. The instrument mechanics (IMs) performing the procedure were confused by the alarm not coming in at the exact time the ABI set point was obtained and inadvertently got out-of-sequence with the instruction steps. After the IMs failed to get the alarm on the first channel tested, they proceeded to the second channel.

They moved the ABI block from the first channel to the second channel per SI-82 instruction steps. While performing the test on the second channel, the IMs remembered the 10-second time delay and returned to the first channel to retest it; however, they forgot to reinstate the ABI block function. This condition caused testing to be performed on an unblocked monitor channel which resulted in the inadvertent ABI actuation.

For further information refer to SQN unit 1 LER SQR0 50-327/85-14.

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3. Corrective Steps Taken and Results Achieved 1

j. A temporary change, PORC approved for permanent revision, was made on

! SI-82 to add a reference to the 10-second time delay to ensure there would be no future confusion.

No ABI actuations have occurred that were due to the problem addressed in the. violation since the change was made.

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l 4. Corrective Steps Taken to Avoid Future Violations i The revision of SQN's SI-82 and subsequent retraining of SQN personnel will resolve the alleged violation.

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5. Date When Full Compliance Will Be Achieved

'The SQN procedure revision will be complete, and training via a memo-

randum from the SQN maintenance supervisor to maintenance personnel will

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be complete by July 24, 1985.

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