05000369/LER-1981-049, Forwards LER 81-049/03L-0.Detailed Event Analysis Encl

Forwards LER 81-049/03L-0.Detailed Event Analysis Encl

ML20009C238
Person / Time
Site:	McGuire
Issue date:	05/07/1981
From:	Parker W DUKE POWER CO.
To:	James O'Reilly NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II)
Shared Package
ML20009C239	List: 05000369/LER-1981-049, Forwards LER 81-049/03L-0.Detailed Event Analysis Encl 05000369/LER-1981-049-03, /03L-0:on 810410,during Mode 3 Initial Fuel Loading,Waste Processing Panel Lost Ac Power,Causing Containment Floor & Equipment Sump Level Indicators in Control Room to Fail
References
NUDOCS 8107200399
Download: ML20009C238 (3)

LER-1981-049, Forwards LER 81-049/03L-0.Detailed Event Analysis Encl

Event date:
Report date:
3691981049R00 - NRC Website

text

_ w y 3 &nm.;> c g c;;;4.;44;gy&--

.m

/

OFFICIAI, copy, DUKE POWER COMPANY A g* }U b}ON,l

'il Powza Buttntwo 422 Socrn Cnuncu Srazzr, CHAnLOTTz, N. C. 28242 BI MAY ll A S. g g WI L LI AM Q. PAR K E R. R.

s[c45 ~*'o'c'Uo.

May 7, 1981

"" "N^,o' 3 o

// A 6-s k Mr. J. P. O'Reilly, Director U. S. Nuclear Regulatory Commission

,f g N

It"

/ ' ), f I Region II R.D 101 Marietta Street, Suite 3100

/g-3 Atlanta, Georgia 30303 g

E JUL17198Fk Re: McGuire Nuclear Station Unit 1

~

Docket No. 50-369 pp f

8

Dear Mr. O'Reilly:

02 N

Please find attached Reportable Occurrence Report R0-369/81-49. This report concerns the operability of the containment Sump Level and Flow Monitoring System. This intident was considered to be of no significance with respect to the health and safety of the public.

Very truly yours, e

William O. Parker, Jr.

RWO:djs cc.

Director Mr. Bill Lrvalee Office of Management and Program Analysis Nuclear Safety Analysis Center U. S. Nuclear Regulatory Cormr.ission Post Office Box 10412 Washington, D. C.

20555 Palo Alto, California 94303 M. J. Graham Resident Inspector l

McGuire Nuclear Station Y

f Y, 6

l l

I 8107200399 810507 i

PDR ADOCK 05000369 l

S PDR

>l d'

MCGUIRE NUCLEAR STATION INCIDENT REPORT REPORT NUlfBER: 81-49 REPORT NTE: April 29, 1981 OCCURRENCE DATE: April 10, 1981 FACILITY: McGuire Unit 1, Cornelius, N.C.

IDENTIFICATION OF OCCURRENCE: The Containment Sump Level and Flow Monitoring System was declared inoperable.

CONDITION PRIOR TO OCCURRENCE: Mode 3, Hot Standby DISCRIPTION OF OCCURRENCE: On April 10, 1981 at 1550 hours0.0179 days <br />0.431 hours <br />0.00256 weeks <br />5.89775e-4 months <br />, the Waste Processing Panel lost AC power. The Containinent Floor and Equipment Sump Level Indicators ic the Control Room failed to the zero scale position. The Shift Supervisor declared this system inoperable. This was a reportable incident pursuant to Technical Specification 3.4.7.1.

APPARENT CAUSE OF OCCURRENCE: The Containment Floor & Equipment Sump Level Indicators' failure was due to the loss of AC Power Supply to the Waste Processing Panel. The Containment Floor and Equipment Sump Level Transmitters received their 120 VAC power from the. Waste Processing Panel.

ANALYSIS OF OCCURRENCE: On April 10, 1981, the Floor Drain Tank Pump would not start. The Waste Processing Panel AC Power Supply was lost This was reported to the Shift Supervisor. The Containrent Floor & Equipmen+

cnip Level Indicators had failed to their zero scale position. The t ta:nment sump level and flow monitoring system was declared inoperable. A ca.~c x Unit 2 Lower Containment was not terminated and the wire was bare and en. s ad.

This was identified to be the power supply cable for Unit 2 Containmen tloor & Equip-l ment Sump Level Transmitter. The hot wire was shorted to its armored shield l

which had caused the breaker to the Waste Processing Panel to trip. The armor was stripped and the hot wire was taped. The Waste Processing Panel i

AC Power was restored and the Containment Floor & Equipment Sump Level Indicators were again operable on April 11, 1981.

l l

1

SAFETY ANALYSIS

At the time the containment sump level and flow monitoring system was inoperable, the sumps' levels were below the hi-level setpoint.

Their appropriate pumps are manually started only when their hi-level setpoint is reached to transfer water to the Floor Drain Tank.

Since there was no excessive leakage at that time, the inoperability of this system:did not have any significant impact on the plant's safe operation and the health and safety of the public were not affected.

i i

e REPORT NUMEdR 81-49 PAGE 2

CORRECTIVE ACTION

The identified shorted cable which caused the loss of AC power to the panel was fixed.

(The armored shield was stripped and the hot wire was taped.) AC power to the Waste Processing Panel was restored and the Containment Floor & Equipment Sump Level Indicators were also back into service and declared operable on April 11, 1981 at 0045 hours5.208333e-4 days <br />0.0125 hours <br />7.440476e-5 weeks <br />1.71225e-5 months <br />.

-(

+

dr 9--,

.__.-,-m,.

.t