ML20045B457

Responds to NRC 930517 Ltr Re Violation Noted in Insp Rept 50-302/93-11.Corrective Actions:Addl Administrative Controls on Switchyard Activities Established & Administrative & Interface Documents Will Be Reviewed

ML20045B457
Person / Time
Site:	Crystal River
Issue date:	06/10/1993
From:	Beard P FLORIDA POWER CORP.
To:	NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM)
References
3F0693-06, 3F693-6, NUDOCS 9306170385
Download: ML20045B457 (3)

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n $y Florida Power c/ftifitie%t Docket No. 50-302 3

June 10, 1993 3F0693-06 U. S. Nuclear Regulatory Commission Attention: Document Control Desk Washington, D. C. 20555

Reference:

1) NRC letter to FPC dated May 17, 1993 Notice of Violation - Inspection Report 93-11

Dear Sir:

Florida Power Corporation (FPC) provides the attached as our response to the subject inspection report.

Sincerely,

\' j f1j, b'$Yf P. M. Beard, Jr.

Senior Vice President Nuclear Operations EEF: mag Enclosure xt: Regional Administrator, Region II NRR Project Manager Senior Resident Inspector 170653 93061703B5 930610 7

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ADOCK 05000302 PDR 9

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FLORIDA POWER CORPORATION '

NRC INSPECTION REPORT NO. 50-302/93-11 REPLY TO A NOTICE OF VIOLATION f

VIOLATION 50-302/93-11-01 Technical Specification 6.8.1.a requires the establishment and implementation of written procedures for applicable procedures recommended in Appendix "A" of Regulatory Guide 1.33, November,1972. Appendix "A" of Regulatory Guide  ;

1.33, November,1972, section C includes instructions for changing modes of  :

operation of the offsite electrical system (access circuits).

Contrary to the above, on April 8, electrical maintenance personnel removed a 500kV substation battery from service without an adequate procedure to delineate the evolution. The batteri hus provides control power to the 500kV switchyard breakers in the offsite circuit which was in use as an offsite

• electrical source, powering safety related loads including decay heat removal systems. The evolution was improperly performed, resulting in tripping of the 500kV switchyard breakers. This deenergized the "B" 4160V Engineered Safeguards electrical bus in service which resulted in an automatic start of the "B" Emergency Diesel Generator and a three minute interruption in the operation of the decay heat removal system. 1 ADMISSION OR DENIAL OF THE ALLEGED VIOLATION Florida Power Corporation (FPC) accepts the Violation.

REASON FOR THE VIOLATION The root causes which created the opportunity for the event are weaknesses in ,

communications and inadequate program controls in oraanizational interface and responsibility assignment. Contributing to the event is personnel . action resulting from inadequate work instructions. Unlike plant chargers, which are capable of supplying DC loads without the batteries attached to the bus,  ;

the switchyard battery chargers are not satisfactory power supplies by themselves. Day shift workers and engineering department personnel were 4 awcre of this condition but did not include written instructions containing the proper sequence of events for performing the work. Due to miscommunication between shifts, night shift personnel mistakenly attempted to complete the task, and unaware of the required action sequence, opened the batter) disconnect switch before deenergizing the charger. The lack of filtering of the switchyard battery charger output caused protective relays to fail, which caused the 500kV breakers to open. This resulted in the '

interruption of offsite power to the plant.

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l CORRECTIVE ACTIONS TAKEN  :

Florida Power Corporation has established additional administrative controls on switchyard activities. These controls will reduce the risk- of interruptions of offsite powt.' by precluding work within the switchyard providing power to shutdown cooling. This would include vehicular traffic and maintenance, modification, or testing activities. Exceptions would: .

require approval of senior plant management prior to initiation. A Human  !

Performance Enhancement System (HPES) root cause analysis was completed.

CORRECTIVE STEPS THAT WILL BE TAKEN TO AVOID FURTHER VIOLATIONS t

Administrative and interface documents will be reviewed and revised as necessary to clearly indicate the responsioility for control of switchyard

• maintenance and testing. Maintenance policies and procedures associated with record keeping and logs will be similarly reviewed and revised as necessary  ;

to strengthen guidance for communicating shift turnover information.  !

Personnel will be trained to the enhancements.

DATE WHEN FULL COMPLIANCE WILL BE ACHIEVED Maintenance policies and procedures will be reviewed / revised and personnel trained by July 30, 1993. Administrative and interface documents will be reviewed / revised and personnel trained prior to the 1994 refueling outage.

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