ML19261A711

LER 79-001/03L-0 on 790109:electronic Switching Sys B1G Sequencer Failed to Meet Time Requirements for Picking Up Step 2.Caused by Agastat Timer Setpoint Drift

ML19261A711
Person / Time
Site:	Farley
Issue date:	02/01/1979
From:	Hairston W ALABAMA POWER CO.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II)
Shared Package
ML19261A709	List: ML19261A708 ML19261A711
References
LER-79-001-03L, LER-79-1-3L, NUDOCS 7902060304
Download: ML19261A711 (1)

Text

NRC F ORM 366 U. S. IVUCLE AR REGULATORY COMMISSION (7 7F -

LICENSEE E\"ENT REPORT a '.

, CONTROL BLOCK: l 1

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(PLEASE PRINT OR TYPE ALL REQUIRED INFORMATION) l0 l 1 l l Al Ll Jl Ml Fl 1l@l0 l0 l- l0 LICENSE 14 l0 l0NUMBERl0 l0 l- l0 l0 j@l 25 4 l 1l 26 1 l 1l 1l@l57 CAT 68l@

LICENSE TYPE 30 7 8 9 LICENSEE CODE 15 CON'T 0 1 " " y l L l@l 0l 5l 0l 0l 0l 3l 4l 8@l0 EVENT SO R 68 69 l1 l0 19 l7 l9 l@l0l2l0l1l7l9l@

DATE 74 75 REPORT DATE 80 7 8 00 61 DOCKET NUMBER EVENT DESCRIPTION AND PROBABLE CONSEQUENCES h

[Ol2l At 1851 on 1/9/79, while performing FNP-1-STP-28.2, the ESS BIG Sequencer failed to l g meet the time requirement for picking up step 2. Tech. Spec. 3.8.1.1 requires two l 3

l separate independent diesel generator sets and sequencers to be operable. Diesel g 4 o s l Generator IB was restored to an operable status at 1950 on 1/9/79. (Diesel Generator l t a l IB would have picked up required loads in an ESS condition.) This occurrence did notl 0 7 l affect the health and safety of the general public. A similar occurrence was reported g g  ; in LER 78-020/03L-0. l C DE CODE SU8CO E COMPONEN T CODE S BC dE S E l0l9l8 lE lE l@ y@ l Xl@

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SE QUENTI AL OCCURRENCE REPORT REVISION EVEN T YE AR REPORT NO. CODE TYPE NO.

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1l0l9l@ 47 CAUSE DESCRIPTION AND CORRECTIVE ACTIONS h i o l The agastat timer setpoint for the ESS BlG Sequencer drifted below the setpoint I g ij (4. 2 sec. actual vs. 5 .5 sec. required) for picking up step 2. The acastat t irier I

, 7 l was adjusted and a satisfactory retest per the applicable portion of FNP-1-STP-28.2 l l,j3l was performed. Diesel Generator 1B was restored to an operable status within the timc]

3 4 l limit specified in Tech. Spec. 3.8.1.1. g.

7 8 9 80 ST S  % POV.ER OTHER STATUS ISCO RY Di3COVERY DESCRIPTION li ls ] ]@ l 110l 0 gl NA l g g Performance of STP 80 l

ACTIVIT V CO TENT RELEASED OF RELEASE A?.tOUNT OF ACTIVITY LOCATION OF RELEASE lt l'G l ] g gl NA 44 l l 45 NA 80 7 8 9 to 11 PLHSONNEL FXPOSURES t .t Jf/DE R TYPE DESCRIPTION

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LOSS OF OH DA?_1 AGE TO F ACitiTY TYPE DESCRIPTION NA l t

i 9 8 9 Zl@l 10 80 7 o le, SUEl@ NA DESCRIPTION 90206OD' Ll l l l l l l l l l *g 7 g- 9 to 6B 69 80 $

NAME OF PREPAREH W. G. HairstOn, III PHONE:

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