ML20215M735
| ML20215M735 | |
| Person / Time | |
|---|---|
| Site: | McGuire, Mcguire  |
| Issue date: | 10/17/1986 |
| From: | Tucker H DUKE POWER CO. |
| To: | Grace J NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II) |
| References | |
| NUDOCS 8611030219 | |
| Download: ML20215M735 (2) | |
Text
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DUKE POWER GOMPANY l'.o. foox 33180 CllAMLOTTE, N.C. 28242 ILE II. TUCKER 3%$3 gy Oo 0CT 24 A10 : n6 October 17, 1986 Dr. J. Nelson Grace, Regional Administrator U.S. Nuclear Regulatory Commission Region II 101 Marietta St. NW, Suite 2900 At.lanta, Georgia 30323
Subject:
McGuire Nuclear Station Docket Nos. 50-369, 50-370
Reference:
NRC/0IE Inspection Report 50-369/86-21, 50-370/86-21 l
Dear Dr. Grace:
Pursuant to 10CFR2.201, please find attached a response to the violation which was identified in the above referenced Inspection Report.
Very truly yours, ps Hal B. Tucker JBD/110/jgm Attachment xc:
Mr. W.T. Orders NRC Resident Inspector McGuire Nuclear Station l
8611030219 861017 PDR ADOCK 05000369 G
PDR I
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DUKE POWER COMPANY NcGUIRE NUCLEAR STATION RESPONSE TO VIOLATION IN INSPECTION REPORT 50-369/86-21 AND 50-370/86-21 Violation 50-370/86-21-03, Severity Level IV TS 6.8.1.a requires that written procedures be established, implemented and maintained covering activities delineated in Appendix A of Regulatory Guide (RG) 1.33, Revision 2, February 1978.
Appendix A of RG 1.33, Revision 2, specifies that activities involving reactor protection system tests and calibrations be performed in accordance with written procedures.
Contrary to the above, the procedure for Response Time Testing of Reactor Trip Breakers RTA and/or BYB (PT/0/A/4601/07A) was demonstrated to be inadequate in that it incorrectly allowed the opening of both the main reactor trip breaker and the bypass reactor trip breaker without requiring control room personnel to block the feedwater isolation signal. This resulted in an inadvertent actuation of the i
Unit 2 engineered safeguard features train A feedwater isolation logic during a performance of the PT on June 23, 1986.
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Response
1.
Admission or denial of the alleged violation:
l Duke Power admits the violation occurred as stated.
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Reason for violation:
The procedure was originally written to permit the main reactor trip breaker to be left in the most desirable state based on plant conditions. However, the effect of opening the bypass breaker while the main breaker was left in the open state was not realized during procedure development.
3.
Corrective steps which have been taken and the results achieved:
Immediately after the procedure deficiency was realized, a procedure change was initiated. This change consisted of adding a caution statement prior to the step for opening the bypass breaker.
This caution requires the control room operator to block the automatic feedwater isolation signal if the main breaker is already open. The procedure for Unit 2 breakers RTB and BYA (PT/0/A/4601/07B), was also changed to add the caution statement. The results were satisfactory when the procedure was performed.
4.
Corrective steps which will be taken to avoid further violations:
In addition to the change which added the caution statement, procedure (PT/0/A/4601/07A) was analyzed to determine if any othe areas were inadequate in relation to preventing the reoccurrence of an automatic J
feedwater isolation; none were found.
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5.
Date when full compliance will be achieved:
)
With the implementation of the procedure change incorporating the caution statement, McGuire achieved full compliance on July 21, 1986.
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