ML20155A796

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Informs That 860311 Meeting Re LER 86-005-01 Concerning Loss of Offsite Ac Power Event on 860128 Inadvertently Assigned to Dockets 50-324 & 50-325 in Region II .Meeting Summary & List of Attendees Encl
ML20155A796
Person / Time
Site: Robinson Duke Energy icon.png
Issue date: 04/02/1986
From: Walker R
NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II)
To: Utley E
CAROLINA POWER & LIGHT CO.
References
NUDOCS 8604100046
Download: ML20155A796 (3)


Text

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A?N 2 TS90 farolina Power and Light Compan)-

/ ATTN: Mr. E. E. Utley Senior Executive Vice President ,

Power Supply and Engineering and Construction P. O. Box 1551 Raleigh, NC 27602 Gentlemen:

SUBJECT:

MEETING

SUMMARY

00C.KET NO. 50-261, REVISION 1 This refers to the meeting conducted at your reauest, in the Region II Gffice on March 11,1986, concerning the loss of of fsite AC power event on January 28, 1986 as delineated in your LER 86-05 revision 0. This was inadvertently assigned to your Docket Nos. 50-325 and 50-324 in a Region II letter dated March 26, 1986, We apologize for any inconvenience this Ms caused.

, f It is our opinion that this meeting was beneficial and has provided a better understanding of your corrective actions for LER 85-05.

In accordance with Section 2.790 of NRC's " Rules of Practice," Title .10, Ccde of  !

Federal Regulations, a copy of this letter and the enclosure's will be placed in the NRC's Public Document Room.

Should you have any questions concerning this matter, we will be pleased to discuss them.

Sincerely Original Signed by Roger D, Walker Roger D. Walker, Director Division of Reactor Projects

Enclosures:

1. Meeting Summary
2. Attendance List cc w/encls:

LG. P. Beatty, Jr., Manager Robinson Nuclear Project Department

. E. Morgan, Plant General Manager t/ . W. Howe, Vice President i

(M.BrunswckNuclearProject R. Dietz, Plant General Manager

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VVNRC Resident Inspectors Document Control Desk 0604100046 860402 State of South Carolina PDR ADOCKODOOg1 State of North Carolina RI. RIl RII

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APR 2 1986 ENCLOSURE 1 MEETING

SUMMARY

Licensee: Carolina Power and Light Company (CP&L)

Facility: Robinson Nuclear Station i

License No.: DPR-23 The analysis and proposed modifications of the fuse arrangeaents for Emergency Bus E-2 to prevent a loss of voltage to the undervoltage relays were reviewed and found acceptable.

The calculations performed by CP&L to verify that DC saturation of the C phase current transformer (CT) caused the lock-out of the 115 kv West Bus resulting in the loss of offsite power had been reviewed by NRR. Discussions surrounding this phenomenon and the corrective actions taken revealed that the possibility of DC saturation of the CT had not been considered as additional station loads have been added since the plant was licensed. The calculations for the modifications to the cts on the primary side of the startup transformer which increased the rating of the cts and paralleling of the CT secondary windings were verified by NRR to be an effective resolution to overcoming the DC saturation created by the inrush of current during auxiliary load transfers.

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3 021m ENCLOSURE 2 LIST OF ATTENDEES Carolina Power and Light Co.

J. Curley, Director of Regulatory Compliance J. Benjamin, HBR Operations Support Supervisor D. Strickland, Superintendent of Substations W. Elmore, Westinghouse Nuclear Regulatory Commission - Region II A. F. Gibson, Director, Division of Reactor Safety (DRS)

V. W. Panciera, Chief, Reactor Projects Branch 2, Division of Reactor Projects (DRP)

A. Herdt, Chief, Engineering Branch, DRS P. Fredrickson, Chief, Reactor Projects Section 2A (RPS2A), DRP F. Jape, Chief, Test Program Section, DRS T. Conlon, Chief, Plant System Section, DRS N. Merriweather, Plant System Section, DRS M. Hunt, Plant System Section, DRS L. Mellen, Project Engineer, RPS2A, DRP J. Knight, NRR PWR Section A 4

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