ML20063A875
| ML20063A875 | |
| Person / Time | |
|---|---|
| Site: | Grand Gulf  |
| Issue date: | 01/07/1994 |
| From: | Hutchinson C ENTERGY OPERATIONS, INC. |
| To: | NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM) |
| References | |
| GNRO-94-00004, GNRO-94-4, NUDOCS 9401270122 | |
| Download: ML20063A875 (3) | |
Text
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W Entergy Operations,Inc.
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- ENTERGY eoi-75c PJ1 Ottum, MS 39 t50 l
TH f 01437 2800 1
1 C. R. Hutchinson l
January 7, 1994 vww-ant 3
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Gard Gut! f twar T@ on i
l U.S.
Nuclear Regulatory Commission l
Mail Station P1-137 Washington, D.C.
20555 4
Attention:
Document Control Desk
SUBJECT:
Grand Gulf Nuclear Station Unit 1 l
Docket No. 50-416 License No. NPF-29 l
Response to Violation for Failure to Follow Instructions on Equipment Clearance i
Report No. 50-416/93-16, dated 12/10/93 (GNRI-93/00210)
GNRO-94/00004
-I Gentlemen:
t Entergy Operations, Inc. hereby submits the response to the Noti e of Violation 50-416/93-16-01.
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cc:
Mr. R. H. Bernhard(w/a)
Mr. H. W. Keiser(w/a)
Mr. R. B. McGehee (w/a)
Mr. N.
S.
Reynolds (w/a)
Mr. H. L. Thomas (w/o)
Mr. Stewart D. Ebneter (w/a)
Regional Administrator U.S.
Nuclear Regulatory Commission Region II 103 Marietta St.,
N.W.,
Suite 2900 Atlanta, Georgia 30323 Mr.
P.
W.
O'Connor Office of Nuclear Reactor Regulation U.S.
Nuclear Regulatory Commission Mail Stop 13H3 Washington, D.C.
20555 9401270122 940107 v
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PDR ADOCK 05000416
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i Attachment to GNRO-94/00004 1
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Notice of Violation 93-16-01 Technical Specification 6.8.1.c requires that written procedures be established, implemented, and a
maintained covering the applicable procedures recommended in Appendix 'A' of Regulatory Guide j
1.33, Revision 2. Regulatory Guide 1.33 recommends that administrative procedures for equipment control (locking and tagging) be established. Administrative Procedure 01-S-06-1, 1
Protective Tagging System, step 6.3.2.a requires the individual performing tag installation shall 2
". follow any special instructions as written in the Special Instructions Block."
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Contrary to the above, on October 07,1993, operators hanging clearance 933749 and 933750 failed to adequately verify inverter 1Y96 was being supplied from its normal power supply, as j
required in the clearance's special instructions, before opening the alternate supply breaker.
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1.
Admission or Denial of the Allened Violation Entergy Operations, Inc. admits to this violation.
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II.
The Reason for the Violation,if Admitted On October 07,1993 a non-licensed operator was realigning equipment associated with j
the uninterruptible power supply system. The equipment clearance had been generated to support the calibration ofinverter alternate source transformer indications. Special instructions had been incorporated into the clearance to direct proper equipment manipulations. The Special Instructions required personnel to verify the inverter was being supplied by the normal power source prior to opening the inverters' alternate supply breaker. The operator observed the inverter barrel switch position but did not verify light indications prior to performing the task. The barrel switch does not change position when an automatic transfer to the alternate source occurs. Indicating lights which are on the j
inverter reveal which power source is in service.
The opening of the above breaker deenergized the associated distribution panel and
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resulted in the actuation of several ESF systems. The affected systems were restored to their appropriate mode of operations.
8 A subsequent investigation revealed that the cause of the incident was due to inadequate
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work practices. Self-checking was not adequately applied while verifying tbc inverter j
status. Operators performing the task did not consider all available information and indications while verifying the power source of the inverter.
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Attachment to GNRO-94/00004
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III.
Corrective Steps Which llave Heen Taken and Results Achieved Personnelinvolved were counseled. Operations personnel were briefed on the event. A Standing Order was issued to require that an information tag be placed on the barrel
- switch when the alternate power supply was supplying the load. Signs were also placed on the alternate power source supply breakers. These signs give appropriate details for inverter verification which would be required prior to the opening of the breakers l
IV.
Corrective Steps to be Taken to Preclude Further Violations
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Entergy Operations feels that the above corrective actions are adequate to prevent recurrence of this violation.
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