ML19254E497

Forwards LERs 79-030/03L-0 & 79-031-03L-0

ML19254E497
Person / Time
Site:	Millstone
Issue date:	10/25/1979
From:	Opeka J NORTHEAST UTILITIES
To:	Grier B NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I)
Shared Package
ML19254E498	List: 05000336/LER-1979-030-03, /03L-0:on 790929,engineered Safety Feature Channel a Sensor Cabinet Trip Bistables All Tripped Due to Loss of Power.Caused by Failed Overvoltage Protector on Channel A-15 Volt Power Supply,Causing Fuse to Blow.Parts Replaced 05000336/LER-1979-031-03, /03L-0:on 790930,control Element Assembly Motion Inhibit Circuit Declared Inoperable Following Loss of Metrascope Indication of Control Element Assembly Position. Caused by Metrascope Component Failure ML19254E497
References
MP-2-4173, NUDOCS 7911010395
Download: ML19254E497 (1)

Text

@lDNT&31?M23'0'E3Tal.7T03333 hhfh,'

? ~~~ ~

'I T> Z;:%%':l,T:LTlCl i

\\

t October 25, 1979 MP 4173 Ifr. Boyce H. Grier Director, Region I Office of Inspection and Enforcement U. S. fluclear Regulatory Commission 631 Park Avenue King of Prussia, Pennsylvania 19406

Reference:

Facility Operating License 110. DPR-65 Docket tio. 50-336 Reportable Occurrence R0-50-336/79-30/3L-0, 79-31/3L-0

Dear fir. Grier:

This letter forwards Licensee Event Reports 79-30/3L-0 and 79-31/3L-0 required to be subnitted within thirty days pursuant to itillstone Unit 2 Appendix A Technical Specifications, Section 6.9.1.9.b, conditions leading to operation in a degraded mode permitted by a limiting condition for operation. An additional three copics of each report are enclosed.

Yours truly, cA

. F. Opeka Station Superintendent 11illstone fluclear Power Statidn JF0/RB:llm

Attachment:

LER's 79-30/3L-0, 79-31/3L-0 cc:

Director, Office of Inspection and Enforcement, Washington, D.C. (30)

Director, Office of Itanagement Infonnation and Program Control, Washington, D.C. (3)

I 1281 001 791101039 [ S