ML18348A269

License Event Report 1976-044-00 Re Drift of Reactor Protection System Steam Generator Low Level Trip Set Point

ML18348A269
Person / Time
Site:	Palisades
Issue date:	01/04/1977
From:	Bixel D Consumers Power Co
To:	James Keppler NRC/RGN-III
References
LER 1976-044-00
Download: ML18348A269 (2)

Text

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consumers

• Power company General Offices: 212 West Michigan Avenue, Jackson, Michigan 49201

• Area Code 517 788-0550 January 4, 1977 Mr James G Keppler Office of Inspection & Enforcement Region III US Nuclear Regulatory Commission 799 Roo*sevelt Road Glen Ellyn, IL 60137

• DOCKET 50-255, LICENSE DPR PALISADES PLANT, ER-76 SG TRIP SET POINT DRIFT Attached is a Reportable Event which relates to the Palisades Plant Reactor Protection System (RPS) Steam Generator (SG) low level trip set point. The set point on one channel was found to have drifted 0.135 inch.below the ac-ceptable value.

David A Bixel Assistant Nuclear Licensing Administrator JAN 6 1977

9LJCENSEE EVENT REPORT e Palisades CONTROL BLOCK: I I I I I I I . [PLEASE PAINT ALL REQUIRED INFORMATION]

1 6 LICENSEE LICENSE EVENT NAME LICENSE NUMBER TYPE TYPE

• IMIIIPIAILl1I Iola I-lo-I ol ol ol ol-lo lo I I 4 I 1 11 I1 I1 I Io I 3 I

. 7 8 9 14 15 25 26 30 31 32 REPORT 'REPORT TYPE. SOURCE . OOCKET NUMBER EVENT DATE REPORT DATE

@E]coN'T l*.. ]-*~I L1J l1.J lo,15 lo I-lo 1215151 L1l 2I ol 617 16 I 1011101417171 7 8 57 59* 59 60 ~- *~-~ N 75 80 EVENT DESCRIPTION lof2I I During monthly testing of the RPS, the SG low level trip set point (Channel D) was

• I

7. a*s

• 80 lol3l I found to be below the' Tech Spec limit by 0.135 inch. The other three channels were I 7 8 9 . . . BO lol41. I normal. In *addition, a review of this event disclosed that a similar set point drift .I 7 8 9 80 lol51 l had occurred on 9-2-76 but was not reported due to an error in the calculation. In I 7 8 9 . . ~

lolsl I both instances the set point was. returned to the* proper ( ER-76-044) (Contd on Line 1.8)

• t, 7 B s PRIME. 80 SYSTEM CAUSE COMPONENT COMPONENT w

CODE SUPPLIER MANUFACTURER VIOLATION

.w CODE COMPONENT CODE 1

~I a s 10 rl Al 11 I I I NI 8 I 12 Tl R I u I 17 43 Iz I2 I2 I2 I 44 47 w48 CAUSE . DESCRIPTION Iola! I The cause: of this event was both set point drift and an administrative limit that was I.

lolsj j.~cl~~~ -t~- th~--T~-c*li-8J,e'c*-1imit-.~----------------~----*-~-------

• 0 j

~: FACIUTY*

%. POWER OTHER STATus*

METHOD OF OISCOVERY DISCOVERY DESCRIPTION w

STATUS fillla LU 1. i I 0 I 0 I .,,_I_*-"""NA""--_ _..,,.I *.NA

...__~~~=-=-~~~~~~~~___,*

I 7 9 10 12 13 44 45 46 80 FORM OF ACTIVITY CONTENT I

rn RELEASED OF RELEASE AMOUNT OF ACTIVITY LOCATION OF RELEASE

~ . -~ .* ~-*_ _ _N_A_ _ _ __.,. NA 7 8 s* 10 11

• 44 45 80 PERSONNEL EXPOSURES NUMBER TYPE DESCRIPTION

~I ol olol ~ NA 7 as 11 12

• 13 80

. PERS.ONNEL INJURIES NUMBER DESCRIPTION

• [EI I 0 I 0 I 0 I NA 7 8 9 . 11 12 80 PROBABLE CONSEQUENCES

~ I None; the other cha.Iu:iels were found acceptable. I 1 as

• 80 LOSS . OR* DAMAGE TO FACILITY

. TYPE DESCRIPTION

[Ifil ~ NA I

7 as 10 80 PUBLICITY Norie 80

DDITIONAL FACTORS E1fil I ( Contd From Line 6) value . A review of the administrative set point limit indicated I 7 8 9 80 G]] I that it was too close to the Tech Spec limit. The administrative limit is being I 7 8 9 80 appropriately revised.