ML20138C447

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Forwards Summary of 860311 Meeting W/Util in Region II Ofc Re Loss of Offsite Ac Power Event on 860128.Meeting Provided Better Understanding of Corrective Actions for LER 86-05. Attendance List Also Encl
ML20138C447
Person / Time
Site: Brunswick  Duke Energy icon.png
Issue date: 03/26/1986
From: Walker R
NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II)
To: Utley E
CAROLINA POWER & LIGHT CO.
References
NUDOCS 8604020499
Download: ML20138C447 (3)


Text

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$R 2 61986

-Carolina Power and Light Company pATTN: 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

DOCKET NO. 50-325 AND.50-324 This refers to the meeting conducted at your request, in the Region II Office on March 11, 1986, concerning the loss of offsite AC power event on January 28, 1986 as delineated in your LER 86-05 revision 0.

It is our opinion that this meeting was beneficial and has provided a better understanding of your corrective actions for LER 86-05.

In accordance with Section 2.790 of NRC's " Rules of Practice," Title 10, Code of Federal Regulations, a copy of this letter 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 Luis A. Reyes /for Roger D. Walker, Director Division of Reactor Projects

Enclosures:

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

LF. W. Howe, Vice President Brunswick Nuclear Project

(. R. Dietz, Plant General Manager bec w/encis:

JRC Resident Inspector Document Control Desk State of North Carolina RI I.. 1 RII ellen:Jd yo?.PBredrickson TCon on V pciera p/Af/86 3 3/af/86 3 /86 3 g/86 8604020499 860326 PDR s\

ADOCK 05000324 L.__ MW

MAR 2 6 1986.

ENCLOSURE 1 MEETING

SUMMARY

Licensee: Carolina Power and Light Company Facility: Brunswick Nuclear Station License Nos.: DPR-71 and DPR-62 The analysis and proposed modifications of the fuse arrangements for Emergency Bus E-2 to prevent a loss of voltage to the undervoltage relays were reviewed and fcund acceptable.

The calculations performed by CP&L to verify that DC satceation 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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, MAR 2 6 1986 ENCLOSURE 2 LIST OF ATTENDEES Carolina Power and Light Co.

J. Curley, Director of' Regulatory Compliance J. Ben Jamine, 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 i