PNO-III-96-063A, on 961003,extension of Forced Outage & Special Insp Team Dispatched Update Made.Unit Shut Down on 960922 to Repair Turbine Control Valve

PNO-III-96-063A:on 961003,extension of Forced Outage & Special Insp Team Dispatched Update Made.Unit Shut Down on 960922 to Repair Turbine Control Valve

ML20129F559
Person / Time
Site:	LaSalle
Issue date:	10/04/1996
From:	Jorgensen B, Ring M NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION III)
To:
References
PNO-III-96-063A, PNO-III-96-63A, NUDOCS 9610040179
Download: ML20129F559 (1)

_ _ _ _ . _ _ _ . . _ _ _ _ _ . _ _ _ . _ _ _ _ . _ _ _ _ _ _ .

October 4. 1996 ,

I

. PRELIMINARY NOTIFICATION OF EVENT OR UNUSUAL OCCURRENCE PNO-III-96-063A This preliminary notification :onstitutes EARLY~ notice of events of POSSIBLE  :

safety or public interest ngrificance. The information is as initially received without verificat on or evaluation, and is basically all that is L known by Region III staff (.. isle, Illinois) on this date.

L

! Facility Licensee Emergency Classification I l Commonwealth Edison Co. Notification of Unusual Event l La Salle 1 Alert '

Marseilles. Illinois Site Area Emergency l Dockets: 50-373 General Emergency l_ X Not Applicable

Subject:

EXTENSION OF FORCED OUTAGE AND SPECIAL INSPECTION TEAM DISPATCHED (UPDATE)

Unit l's forced outage has been extended to approximately October 23, 1996, due to new engineering and work control 1ssues which have emerged -

during the outage. The unit was shut down on September 22, 1996, to  !

repair a turbine control valve. The valve was repaired, but the unit  :

remained shut down for an engineering evaluation of an issue (raised by l an NRC inspection) concerning a possible water hammer in the residual heat removal (RHR) service water system. i Subsequently, the licensee identified a second engineering issue.

involving a concern that certain air-operated valves in the Primary Containment Isolation System might not close under all operating conditions. Both testing and expanded engineering evaluations are being conducted as a result of the finding that the effective area of diaphragms in the valves' actuators differs from design information provided by the manufacturer. This issue may be-generic. with implications for air-operated valves at other nuclear plants.

A work control issue related to the LaSalle Unit 2 refueling outage was '

also identified by the licensee. Recently there were two examples of inadequate controls in equipment removal from service and its restoration to service under the licensee's out-of-service process. One example  ;

involved a Reactor Protection System trip function, and the second involved Primary Containment Isolation System motor-driven valves.

A special NRC inspection team was dispatched to the plant on October 1, 1996, to independently assess these developing issues and the licensee's performance in the areas of engineering and work controls.

The State of Illinois ~will be notified. The information in this preliminary notification has been reviewed with licensee management.

This information is current as of 3:00 p.m. on October 3, 1996.

l

Contact:

MARK RING BRUCE JORGENSEN (630)829-9703 (630)829-9615 l

9610040179 961004 PDR I&E A

[

PNO-III-96-063 PDR 4 {

_ __ -_ _ .__ _