ML20138A457
| ML20138A457 | |
| Person / Time | |
|---|---|
| Site: | Sequoyah  |
| Issue date: | 03/04/1986 |
| From: | Gridley R TENNESSEE VALLEY AUTHORITY |
| To: | Grace J NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II) |
| References | |
| NUDOCS 8603140255 | |
| Download: ML20138A457 (3) | |
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TENNESSEE VA* LEY AUTHORITY CHATTANOOGA.1 ENNESSEE 37401 LP SN IS7B Lookout Place J Q$ NE M
h 4, 1980 U.S. Nuclear Regulatory Commission Region 11 ATTN:
Dr. J. Nelson Grace, Regional Administrater 101 Marietta Street, NW, Suite 2900 j
Atlanta, coorgia 3032.s
Dear Dr. Grace:
l SEQUOYAH NUCLEAR PMNT UNITS 1 ArfD 2 - htt0-01E REGION II INSPECTION REPORT 50-327/85-46 AND 50-328/85 RESPONSE TO V10LATIONS i
Please refer to my letter dated Februa.ry 28, 1986 to you regarding the above inspection report. Due to an inadvertent error the response to violation 85-46-10 vas omitted from your copy of the response.
Enclosed is the response i
j to that violation.
I apologize for Eny inconvenier.co.
If you have any questions, please gel in touch with R. E. Alsup at FTS 858-2725.
To the best of my knowledge, I declare the statements contained herein are completo and true.
Very ttuly yours, TE! JESSE ' ALLEY AUTis?dITY R. Orldiey Hana6er of Licensing Enclosure ec:
Mr. James Taylor, Director (Enclocure) office of Inspection and Enforcement U.S. Nuclear Re6ulatory Commission Washington, D.C.
20555 i
0 327 G
PDR An Equal Opportunity Employee l \\
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Violation 50-327/85-46-10 and 50-328/85-46-10 TS 6.5.1.6.g requires that the Plant Operations Review Committee (PORC) review unit operations to de 2ct potential nuclear safety hazards.
Contrary to the above, the PORC failed to conduct a formal review of the potential nuclear safety hazards associated with accuracy of Measuring and Test Equipment (M&TE) used for calibration of Reactor Prctection System (RPS) instrumentation. The M&TE accuracy for such test equipment as Fluke 8600 and Ashcrof t Digigage used for calibrating RPS 1r.strumen-tation did not meet the accuracy assumptions used in the setpoint methodology for RPS trip setpoints.
This is a Severity level IV Violation (Supplement I).
1.
Admission or Dental cf Alleged Violation TVA admits the violation occured as stated.
2.
Reason for the Violation The information was received onsite through informal channels. A question was raised on the integrity of the safety margin associated with the containment pressure channel protection functions.
The potential problem was related to the difference between actual M&TE used for calibration and that specified by the WSM. Additionally, two of the transmitters had been replaced with a span change from -1 to 15 PSID to -1 to 17 PSID.
A senior level Compliance Staff engineer performed an evaluation based on actual M&TE used, calibration data retrieved from QA records, and a working knowledge of the plant systems.
The conclusion of the evaluation was that the safety margin was actually much better than originally stated in the HSM; therefore, no technical specification violation existed, and there was no potential for a nuclear safety hazard.
The evaluation was discussed with the Compliance Staff supervisor, who concurred with the con:lusion.
The violation occurred Lecause personnel involved
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did not consider the evaluation to require PORC review.
3.
Corrective Steps Taken and Results Achieved Plant management has reemphasized the review respoasibilities of PORC (TS 6.5.1.6.g) to the individuals involved.
The requirements for PORC review are delineated in technical specifications and-administrative instruction SQA-21.
- 4.
Corrective Steps Taken to Avoid Further Violations TVA will investigate alternate methods of performing reviews of items that could affect nuclear safety.
This will include, but is not confined to, consideration of the creation of PORC subcommitteas, a list of qualified reviewers, or delegation to other quallfled reviaw groups such as the ISEG.
The results of
.this investigation will be provided in a supplemental response by June.1, 19r,6.
.c 5.
Date When Full Compliance Hill Re Achieved Full compliance will be achieved when the Compliance Staff evaluation is PORC reviewed.
This revle.v will be performed before either unit restart.
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