05000373/LER-1982-155, Forwards LER 82-155/03L-0.Detailed Event Analysis Encl

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Forwards LER 82-155/03L-0.Detailed Event Analysis Encl
ML20070J091
Person / Time
Site: LaSalle Constellation icon.png
Issue date: 12/06/1982
From: Diederich G
COMMONWEALTH EDISON CO.
To: James Keppler
NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION III)
Shared Package
ML20070J092 List:
References
NUDOCS 8212270354
Download: ML20070J091 (2)


LER-2082-155, Forwards LER 82-155/03L-0.Detailed Event Analysis Encl
Event date:
Report date:
3732082155R00 - NRC Website

text

_ ~. _ _

f~'N Commorrveelth Edloon

/ u k LtSalleCountyNuclearStition

- *I / Rural Route #1. Box 220 I

(-' 's-' Marseilles,lilinois 61341 Telephone E15/357-6761 l

j December 6, 1982 4

l' Mr. James G. Xeppler Regional Administrator

} Region til U.S. Nuclear Regulatory Commission 799 Roosevelt Road j Glen Ellyn, IL 60137 l

Dear Sir:

Reportable Occurrence Report #82-155/03L-0 Docket #050-373 is being submitted to your office in accordance with LaSalle County Nuclear Power Station Techni-cal Specification 6.6.B.2.(b), conditions leading to operation in a degraded mode permitted by a limiting condition for operation or plant shutdown required j by a limiting condition for operation.

J G' J. Diederich '

1 Supe rin tenden t LaSalle County Station j GJD/GW/Irw 1

Enclosure i

cc: Director of Inspection & Enforcement Director of Management Information & Program Control i U.S. NRC Document Management Branch inpo-Records Center File /NRC DEC 17 I981

,;_S212270354 '821206

, PDR ADOCK 05000155

-S .. . PDR .__ _ Mo7R

N 4*

, I. LER NUMBER: 82-155/03L-0

11. -LASALLE COUNTY STATION: Unit 1 4

lif. DOCKET _NUMBCR: 050-373 IV. EVENT DESCRIPTION:

Technical Specification 3.6.5 1 requires secondary containment integrity to be maintained at all times in condition 1. On November 18, 1982 both' i doors into the Unit i Reactor Building on elevation 761' opened at the i same time while the Unit was in Condition 1.

V. PROBABLE CONSEQUENCES OF THE OCCURRENCE: ,

The purpose of secondary containment is to ensure that no uncontrolled

' radiocctive releases occur. When door 418 was opened the differential pressure caused door 285 to open allowing an inflow of air to the reactor building. Although the definition of secondary containment was violated, negative pressure was maintained in the Reactor Building and

the air flow was from the Turbine building into the Reactor Building. In addition primary containment integrity was in effect at all times. Safe.

j operation of the plant was maintained. , The health and safety of the public was not affected.

i VI. CAUSE: l I The cause of this occurrence was that door 285 electric strike was out- ,

i of-adjustment. Therefore the latch bolt could not work properly. The lock was manufactured by Yale model 8048.

j Vll. CORRECTIVE ACTION:

! The electric strike was adjusted the same day so that the. latch bolt worked properly. Procedure LO3-CS-MI, Secondary Containment Integrity

' for Conditions 1, 2, 3 and

  • will be revised to check the' operability

! of the Reactor Building interlock doors. AIR l-82-577 has been generated to track this procedure change.

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Prepared by: Diane L. Kay i

l F

4 x 4

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