ML20151H785
| ML20151H785 | |
| Person / Time | |
|---|---|
| Site: | Catawba  |
| Issue date: | 04/12/1988 |
| From: | Tucker H DUKE POWER CO. |
| To: | NRC OFFICE OF ADMINISTRATION & RESOURCES MANAGEMENT (ARM) |
| References | |
| NUDOCS 8804200524 | |
| Download: ML20151H785 (3) | |
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DuxE POWER Goxem P.0, uox 33180 011ARLOTTm N.o. 2t3242 ifAL 11. TUCKER
. TELEPHOPrE wa pensioen (Fo4) 073-4801 wiumu t wev=ce Apr.4.1 12, 1988 U. S. Nuclear Regulatory Coraraission Attention: Document Control Desk Washington, D. C. 20555
Subject:
RII/PKV/MSL Catawba Nuclear Station Docket Nos. 50-413 and 50-414 IE Report 50-413,-414/88-06
Dear Sir:
Please find attached a reply to the Notice of Violation for Violation 413,414/88-06-01, which was transmitted by Dr. J. Nelson Grace's letter of March 14, 1988.
Very truly yours, 3 "J.
f#
Hal B. Tucker LTB/6021/sbn Attachments xc:
Dr. J. Nelson Grace, Regional Administrator U. S. Nuclear Regulatory Commission
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Region II 101 Marietta Street, NW, Suite 2900 Atlanta, Georgia 30323 Mr. P. K. Van Doorn i
NRC Resident Inspector 1
Catawba Nuclear Station i l 8804200524 880412 PDR ADOCK 05000413
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i Duke Power Company.
Reply to a Notice of Violation 414/88-06-01 Technical Specification 3.7.4 requires at least two independent nuclear service water loops be operable in Modes 1, 2, 3 and 4.
With only one nuclear service water loop operabic, restore at least two loops to operable status within 72 hours8.333333e-4 days <br />0.02 hours <br />1.190476e-4 weeks <br />2.7396e-5 months <br /> or be in at least hot standby within the next six hours in cold shutdown v' thin the following 30 hours3.472222e-4 days <br />0.00833 hours <br />4.960317e-5 weeks <br />1.1415e-5 months <br />.
f*ontrary to above, on August 30, 1986, at 8:30 p.m. with Unit 1 shutdown for refueling and Unit 2 in Mode 1, Power Operation, Nuclear Service Water Train A was made inoperable with respect to Unit 2.
Da September 8, 1986 at 4:40 a.m.,
Unit 2 entered Mode 5, thus exeneding by approximately 92 hours0.00106 days <br />0.0256 hours <br />1.521164e-4 weeks <br />3.5006e-5 months <br /> the time required to shutdown to Mode 5.
Response
(1) Admission or Denial of Violation Duke Power Company admits the violation.
(2) Reasons for Violation This violation occurred as a result of an error in an evaluation of an operating procedure.
In evaluating the procedure to be followed in the event that an emergency diesci were removed from service for an extended period of time, it was recognized that the redundant essential headers must be isolated to assure continued operability. The isolation valve which would normally receive electrical power from the affected diesel generator la the event of a loss of offsite power was selected as the appropriate valve to be placed in the closed (safe) position.
However, it was not recognized at the time that, under certain postulated conditions, additional operator actions may have been required to assure that the Nuclear Service Water System would perform its design safety functions. The procedures to perform these actions were in place at the time.
(3) Corrective Actions Taken and Results Achieved The affected procedures have been corrected and the system design has been reviewed in detail to assure that no similar conditions exist. This event has heightened the awareness of all involved to insure that all postulated accident scenarios are reviewed during safety evaluations.
The potential reportability of significant safety issues which are under review will be closely evaluated to determine if a preliminary courtesy report is in order. This report would present the stated problem, the potential safety significance, any interim corrective or compensatory actions, and the current state of the evaluation process.
The courtesy report will be made under the LER format of 10 CFR 50.73 with an additional 10 CFR 50.72 notification, if considered appropriate.
Duke Power Company will also continue to keep both Region II and NRR fully informed of emerging problems and issues using the information communications paths already established.
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a s (4) Corrective Actions to be Taken to Avoid Further Violations The corrective actions taken in Section 3 above should insure avoidance of further violations.
(5) Date of Full Compliance Duke Power Company is now in full compliance.
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