ML20149D375

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Forwards Insp Repts 50-220/93-15 & 50-410/93-15 on 930719-23.Adequate Steps Taken to Assure Corrective & Preventive Measures to Enhance Reliability of Station Offsite Power Supply Sources
ML20149D375
Person / Time
Site: Nine Mile Point  Constellation icon.png
Issue date: 09/16/1993
From: Durr J
NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I)
To: Sylvia B
NIAGARA MOHAWK POWER CORP.
Shared Package
ML20149D380 List:
References
NUDOCS 9309210026
Download: ML20149D375 (3)


See also: IR 05000220/1993015

Text

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SEP 161993

Docket Nos. 50-220

50-410

Mr. B. Ralph Sylvia

Executive Vice President - Nuclear

Niagara Mohawk Power Corporation

301 Plainfield Road

Syracuse, New York 13212

Dear Mr. Sylvia:

SUBJECT: NRC REGION I COMBINED INSPECTION REPORT NOS.

50-220/93-15 AND 50-410/93-15

This letter transmits the NRC Region I inspection report for the inspections conducted by

Mr. R. Bhatia of this office on July 19-23, 1993, at Niagara Mohawk, Salina Meadows

Office in Syracuse, New York, and at Nine Mile Point Units 1 and 2, Scriba, New York.

Mr. Bhatia discussed the findings of this inspection with members of your staff at the

conclusion of the inspection.

Areas examined during this inspection focused on assessing the offsite power supply sources

for Nine Mile Units 1 and 2 and your completed corrective actions to close the previous

Electrical Distribution Functional Inspection (EDSFI) outstanding items for Unit 1. The

inspection included the ongoing breaker replacement effort to further enhance the offsite

power supply sources for Unit 2, based on several concerns generated by the loss of power

events during the last two years. Within this scope, the inspection consisted of selective

examinations of design records, procedures and representative records, interviews with

personnel, and observations by the inspector.

Overall, the inspector concluded that the Nine Mile Point 1 and 2 offsite power sources are

reliable. We note that you have taken adequate steps to assure corrective and preventive

measures to enhance the reliability of the station offsite power supply sources. Further, you

are replacing the four less reliable 115 kV breakers in the Scriba substation during the 1993

fall refueling outage of Unit 2. In addition, the corrective actions for three previously

identified issues were found to be adequate and the items are closed. One other issue

reviewed pertaining to the emergency diesel generator transient loading analysis was found

partially complete; however, because of the low margin obtained in your calculation results,

you have taken

OFFICIAL RECORD COPY A:NM9315. INS

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9309210026 930916 ^

gDR ADOCK 05000220 / l/

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SEP 161993

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Mr. B. Ralph Sylvia 2

additional test data to confirm that your computer model assumptions are adequate.

Therefore, this item is updated in this report. Within the scope of this inspection, no l

violation or deviation was observed.

Your cooperation with us in this matter is appreciated.

Sincerely,

.

Jacque P. Durr, Chief

Engineering Branch

Division of Reactor Safety

Enclosure: NRC Region I Combined Inspection Report Nos. 50-220/93-15 and

50-410/93-15

cc w/ encl:

C. Terry, Vice President - Nuclear Engineering

J. Perry, Vice President - Quality Assurance

Vice President - Nuclear Generation

K. Dahlberg, Unit 1 Plant Manager

M. McCormick, Unit 2 Plant Manager

D. Greene, Manager, Licensing

J. Warden, New York Consumer Protection Branch

G. Wilson, Senior Attorney

M. Wetterhahn, Winston and Strawn

Director, Energy & Water Division, Department of Public Service, State of New York

C. Donaldson, Esquire, Assistant Attorney General, New York Department of law

K. Abraham, PAO (2)

Public Document Room (PDR) .

Local Public Document Room (LPDR)

Nuclear Safety Information Center (NSIC)

NRC Resident Inspector

State of New York, SLO Designee

,

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OFFICIAL RECORD COPY A:NM9315. INS  ;

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SEP 161993

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Mr. B. Ralph Sylvia

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bec w/ encl:

Region I Docket Room (with concurrences)

C Cowgill, DRP

L. Nicholson, DRP

D. Weaver, DRP

W. Schmidt - Nine Mile Point '

V. McCree, OEDO

R. Capra, NRR

J. Menning, NRR

D. Brinkman, NRR

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RI:DRS R :D #1 RI:DRS

Bhatia Ruland Durr

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09/7/93 09/7/93 09/ /93

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OFFICIAL RECORD COPY A:NM9315. INS

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