ML20246M616
| ML20246M616 | |
| Person / Time | |
|---|---|
| Site: | Sequoyah  |
| Issue date: | 08/25/1989 |
| From: | Wilson B Office of Nuclear Reactor Regulation |
| To: | |
| Shared Package | |
| ML20246M584 | List: |
| References | |
| 50-327-89-19, 50-328-89-19, NUDOCS 8909070209 | |
| Download: ML20246M616 (2) | |
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1 ENCLOSURE 1 NOTICE OF VIOLATION Tennessee Valley Authority Docket Nos. 50-327, 50-328 Sequoyah License Nos. DPR-77, DPR-79 During the Nuclear Regulatory Commission (NRC) inspection conducted from July 6,1989, through August 5,1989, a violation of NRC requirements was identified.
In accordance with the " General Statement of Policy and Procedure for-NRC Enforcement Actions," 10 CFR Part 2, Appendix C (1989), the violation
'is listed below:
A.
Technical Specification 6.8.1 requires that procedures recommended in Appendix A of Regulatory Guide 1.33, Revision 2, be established, implemented and maintained.
This includes operating and abnormal operating procedures.
This requirement is implemented for failures of source range reactor trip system instrumentation by Abnormal Operating Instruction (A01)-4, Nuclear Instrumentation Malfunctions.
A01-4, states that operators shall place the failed detector trip switch to bypass on panel M-13.
Contrary to the above, when channel N-31 exhibited severe spiking and was declared inoperable, the licensee did not place the level trip switch in the bypass position.
This is a Severity Level IV violation (Supplement I).
B.
Technical Specification 3.0.1 states that upon failure to meet a Limiting Condition for Operation, the associated Action requirements shall be met.
Technical Specification 3.3.1 states that as a minimum, the reactor trip system instrumentation channels and interlocks of Table 3.3-1 shall be operable with response. times as shown in Table 3.3-2.
Action i
Statement 2, of TS 3.3.1, states that with the number of operable channels one less than the total number of channels, startup and power operation may proceed provided conditions 2a through 2d are met.
Action 2d states that the quadrant power tilt ratio (QPTR), as indicated by the remaining three detectors, shall be verified consistent with the normalized symmetric power distribution obtained by using the movable incore detectors in the four pairs of symmetric thimble locations at least once per 12 hours1.388889e-4 days <br />0.00333 hours <br />1.984127e-5 weeks <br />4.566e-6 months <br /> when thermal power is greater than 75% of rated thermal power.
On July 22, 1989, the Unit I reactor trip system power range channel N43 failed. The licensee entered Action Statement 2.d.
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Tennessee Valley Authority 2
Docket Nos. 50-327, 50-328 Sequoyah License Nos. DPR-77, DPR-79 Contrary to the above, the licensee failed to reduce power to less than or equal to 75% of rated thermal power to meet Action Statement 2.d when an incore flux map to verify the QPTR could not be completed within the 12 hours1.388889e-4 days <br />0.00333 hours <br />1.984127e-5 weeks <br />4.566e-6 months <br /> required by Action Statement 2.d.
This is a Severity Level IV violation (Supplement I).
Pursuant to the provisions of 10 CFR 2.201, Tennessee Valley Authority is hereby required to submit a written statement or explanation to the Nuclear Regulatory Commission, ATTN:
Document Control Desk, Washington, DC 20555, with a copy to the Associate Director for Special Projects, Office of Nuclear Reactor Regulation and a copy to the NRC Resident Inspector, Sequoyah, within 30 days of the date of the letter transmitting this Notice.
This reply should be clearly marked as a " Reply to a Notice of Violation" and should include [for each violation]: (1) admission or denial of the violation, (2) the reason for the violation if admitted, (3) the corrective steps which have been taken and the results achieved, (4) the corrective steps which will be taken to avoid further violations, and (5) the date when full compliance will be achieved.
Where good cause is shown, consideration will be given to extending the response time.
If an adequate reply is not received within the time specified in this Notice, an order may be. issued to show cause why the license should not be modified, suspended, or revoked or why such other action as may be proper should not be taken.
THE NUCLEAR REGULATORY COMMISSION M-n
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Bruce A. Wilson, Assistant Director for TVA Inspection Programs TVA Projects Division Office of Nuclear Reactor Regulation Dated at Atlanta, Georgia this 25thday of Aug.1989 l
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