ML19209D098

Interim Deficiency Rept Re Inadequate Range of Fault Current Protection on Some Containment Electrical Power Penetrations.Final Rept Will Be Submitted When Work on Circuit Mods Complete

ML19209D098
Person / Time
Site:	North Anna
Issue date:	09/27/1979
From:	Brown S VIRGINIA POWER (VIRGINIA ELECTRIC & POWER CO.)
To:
References
717A, NUDOCS 7910190402
Download: ML19209D098 (1)

Text

't ijs;GCIE)".';-

^ " " ' --

Vepco A59$te56r 27,1979 g pnJ l Serial No. 717A Mr. James P. O'Reilly, Director PSE&C/JMD:adw:mc Office of Inspection & Enforcement .

U.S. Nuclear Regulatory Comis-ion Docket No. 50-339 Region II 101 Marietta Street, Suite 3100 Atlanta, Georgia 30303

Dear Mr. O'Reilly:

On August 28, 1979, a report was made under the provisions of 10CFR50.55(e) concerning an inadequate range of fault current pro-tection on some containment electrical power penetrations.

During a review of the containment electrical power penetration fault current protection, it was discovered that some of the penetra-

• tion limits are not co-ordinated with the protection device curves throughout the full range of potential faults.

We have completed the review of all power circuits utilizing containment electrical penetrations and determined the revision or modification necessary to ensure protection of the are There penetrations for approximately the full range of potential fault currents.

eighty (80) circuits that require one of the following for com protection: circuit durrig plant operation, 3) replace starter overicad relay and contactor with larger size, 4) add breaker to circuit, 5) double up penetration feed-thru conductors, or 6) add fuse to existing cir-cuit.

Work is presently in progress on several of the circuit modifi-cations. A firm completion date is not available due to as yet in-complete material delivery schedules. Completion is estimated by Novenl.er 1, 1979.

This letter is an interim report on this subject and a final report will be submitted when the corrective action is com us. 7 /

Ve ly youss hut hyrown, 117.5 ??2 ... t. .

- Senior V ice President-Power jitatio Enginee ing and Constructiort, cc: Mr. Victor Stello, Director p 9 Office of Inspection & Enforcemen

/~

190['Q4 h(

Mr. Harold R. Denton, Director Office of Nuclear Reactor Regulation

~0 N03I OFFIO[AL COP 3