ML19317G046

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AO 50-312/74-13:on 741203,diesel Generator a Failed to Start.Caused by Malfunctioning Zener Diodes.Damaged Relay Tachometer Returned to Dynalco Corp for Testing
ML19317G046
Person / Time
Site: Rancho Seco
Issue date: 01/02/1975
From: Colombo R
SACRAMENTO MUNICIPAL UTILITY DISTRICT
To:
Shared Package
ML19317G041 List:
References
NUDOCS 8002210747
Download: ML19317G046 (1)


Text

UCENSEE EVENT REPORT..

~

CONTROL BLOCK:l l'

l l

l l

l (5.i 4 ACE Pn1NT ALL REZU!AtD INFZRfAATl!N)

UCENSEE LCENSE EVENT NAME LCENSE NUMBER TYPE TYPE Cl AlR l S l S l Il l 0l 0l-l 0 l 0 l 0 l 0l 0l-l0 l]

l 4 l 1 l1 l1l1l l0l1l 7 89 14 15 25 26 30 31 32 CATEGORY T

CE OCCKET NUMBER EVENT DATE REPORT DATE hCON'T l pl Ol lLl l Ll l 0l 5l0 l-l 0 l 3 l 1 l 2 l l 1l 2l 0l 3 l 7 l 4 l l Ol 1l 0l2 l7 (5 l 7 8 57 58 59 60 61 68 69 74 75 80 EVENT DESCRIPTION gg l A Diesel Generator "A" start was attempted from the Control Room. All auxiliary l

7 89 80 RE l syst cs indicated normal but the diesel did not start.

The alternate Diesal "B" l

80 7 89 3G l was started and operated successfully. This is the third diesel starr failure of thid 80 7 89 I

3E I r-mn (AO-50-312-74-13).

80 7 89 DE I I

80 7 89 ppus E

CCOE COMPONENT CODE M

AC A

VOLATON RE lE)El lE l lE l N l G l Il N J

[L_j lBl4l3i5l J

I 7 89 10 11 12 17 43 44 47 48 CAUSE OESCRIPTION l Three Zener diodes overheated and failed in the speed relay tachometer. The l

c 80 7 89 Q l ralfunction sent a 40 RPM signal to the starting circuit that prevented energizing l

7 89 80 the air start solenoids.

l 80

's'tNuS o!sCovEnY t, PowEn oTHEn status oiscovEnY CEsCniPToN

(_BJ l0l 4l 0l l NA l d l Test Prior to Maintenance l

11 7 8 9

10 12 13 44 45.

46 80 e

AMOUNT OF ACTIVITY LCCATON OF AELEASE A LE S D OF

(_Z_jEL A E l NA l

l NA l

l Zl 7 J 9

10 11 44 45 80 PERSONNEL EXPOSUAES NUMBER TYPE CESCAPTCN

@ l 01 0l 0l Wl NA l

7 b9 11 12 13 80 PERSONNEL INJUR'ES NUMBEA CESCA>Pf?CN l 0l 0l0 l l

NA l

14 7 89 11 12 80 OFFSITE CONSECUENCES 15 l NA l

7 89 80 inSS OR DAMAGE TO FACILITY 4

CESCAiPTON l

b. Z.,j l

NA 7 89 10 80 PUBLICITY l Local newspapers informed - Sacramento " Bee" and "The Union" l

17 7 89 80 "x ADDITICNAL / ACTORS l

\\

ji 7%9 80 8l l

7 89 80 R. W. Colombo (916) 452-3211 NAME PHONE:

GPO 881 667

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