05000265/LER-1981-003, Forwards LER 81-003/01T-0.Detailed Event Analysis Also Encl

From kanterella
(Redirected from ML20004D707)
Jump to navigation Jump to search
Forwards LER 81-003/01T-0.Detailed Event Analysis Also Encl
ML20004D707
Person / Time
Site: Quad Cities Constellation icon.png
Issue date: 02/13/1981
From: Kalivianakis N
COMMONWEALTH EDISON CO.
To: James Keppler
NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION III)
Shared Package
ML20004D708 List:
References
NJK-81-73, NUDOCS 8106090670
Download: ML20004D707 (2)
v • d • e


LER-1981-003, Forwards LER 81-003/01T-0.Detailed Event Analysis Also Encl
Event date:
Report date:
2651981003R00 - NRC Website
v • d • e

text

Commonwe{..S Edison Quad Cities Nuc. Power Station 22710 208 Avenue North Corcova. Illinois 61242 Telephone 309/654 2241

/.

'/,%

/

/f

%[

9p' 6}\\

(V NJ K-81-73 N$ OS 4

16 S'"g h[g]

February 13, 1981 N

0" J. Keppler, Regional Di rector Office of Inspection and Enforcement Region 111 U. S. Nuclear Regulatory Commission 799 RooseveIt Road Glen Ellyn, IL 60137 Reference: Quad-Cities Nuclear Power Station Docket Number 50-265, DPR-30, Unit Two Append l.v. A, Sections 3.5.C.3., 3 5.E.3., and 6.6.B.I.e.

V Enclosed please find Reportable Occurrence Report Number R0 81-03/OlT for Quad-Cities Nuclear Power Station. This occurrence was previously reported to Region Ill, Office of Inspection and Enforcement by telephone on-February -2, 1981, and by telecopy on February 3, 1981.

This report is submitted to you in accordance with the requirements of Technical Specification 6.6.B.I.e., as a failure or mlfunction of one or more components which prevents or could prevent, by itself, the fulfillment of the functional requirements of system (s) used to cope with accidents analyzed in the SAR.

Very truly yours, COMMONWEALTH EDISON COMPANY QUAD-CITIES NUCLEAf} POWER TpTION f f n$wt' '

N. J. Kalivianakis Station Superintendent NJK:JRW/bb

'V Enclosure i

cc R. F. Janecek H. Chrissotimos NOIT #

8106090 670 g

o 1.

LER NUMBER: LER/R0 81-03/0lT II.

LICENSEE NAME: Commonwealth Edison Company Quad-Cities Nuclear Power Station Ill. FACILITY NAME: Unit Two IV.

DOCKET NUMBER: 050-265 V.

EVENT DESCRIPTION

On February 2,1981, at 2215, while performing HPCI Motor-Operated Valve Operability Test, QOS 2300-3, the Unit Two operator closed the HPCI Out-board Isolation valve, MO-2-2301-5, but could not re-open it.

Unit Two was holding load at 200 MWe.

RCIC had been made Inoperable prior to the time of the occurrence. Technical Specification 3.5.C.2. outlines requirements to be fulfilled in the event the HPCI system is inoperable.

A unit shutdown was subsequently initiated. Auto pressure relief and all low pressure ECCS were operable.

VI.

PROBABLE CONSEQUENCES OF THE OCCURRENCE:

RCIC is required to be operable in the event the HPCI System is inoperable.

RCIC had been made inoperable prior to the time of the occurrence and load reduction for unit shutdown within 24 hours2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br /> from the time of the occurrence was necessary. At 2225, load was reduced at a rate of 25 MWe per hour. At 2330 RCic was made operable and load 4

reduction was terminated.

Vll. CAUSE:

The MO-2-2301-5 valve operator had been replaced during a weekend maintenance outage starting January 31, 1981. The valve proved operable in the cold condition prior to unit startup on February 1,1981.

In the hot condition the valve disc apparently had remained stuck in the valve seat. More torque was therefore required to lif t the valve disc off of the seat. The limit switches did not remain on bypass long enough to prevent the torque switches from shutting off the valve motor operator.

Thus, the valve disc could not be lifted off of the valve seat.

Vill. CORRECTIVE ACTION:

The limit switches were adjusted to remain on bypass for a longer period.

After proper adjustment ei the limit switches, proper indication on Control Room panel 902-3 was received after the valve disc lifted off of the valve seat. M0-7-2301-5 was then cycled three times satisfactorily.

HPCI was declared operable at 2305 hours0.0267 days <br />0.64 hours <br />0.00381 weeks <br />8.770525e-4 months <br /> on February 2, 1981.

i O

i l

Retrieved from "https://kanterella.com/w/index.php?title=05000265/LER-1981-003,_Forwards_LER_81-003/01T-0.Detailed_Event_Analysis_Also_Encl&oldid=4672548"