ML20009A866

LER 81-017/03L-0:on 810605,three 4 Kv Bus Degraded Grid Voltage Relays & Eight 4 Kv Bus Loss of Voltage Relays Were Found to Have Exceeded Tech Specs.Caused by Excessive Voltages.Relays Adjusted

ML20009A866
Person / Time
Site:	Cook
Issue date:	07/03/1981
From:	Palmer R INDIANA MICHIGAN POWER CO. (FORMERLY INDIANA & MICHIG
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION III)
Shared Package
ML20009A862	List: ML20009A861 ML20009A866
References
LER-81-017-03L-01, LER-81-17-3L-1, NUDOCS 8107140377
Download: ML20009A866 (2)

Text

NRC FORM 366 U. S. NUCLEAR REGULATORY COMMISSION

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74 REPORT DATE 80 EVENT DESCRIPTION AND PROBABLE CONSEQUENCES O'o io L2_] lDURING SURVEILLANCE TESTING IN MODES 5 AND 6, IT UAS DISCOVERED THAT THREE 4KV BUS l io i3 i i DEGRADED GRID VOLTAGE RELAYS HAD EXCEEDED THE TOLERANCE ALLOWED BY TECHNICAL SPECIFI- l lo i4i l CATION TABLE 3.3-4 ITEM 8.b AND THAT EIGHT 4KV BUS LOSS OF VOLTAGE RELAYS HAD EXCEEDED 1 lo Isl I THE TOLERANCE ALLOWED BY TECHNICAL SPECIFICATION TABLE 3.3-4 ITEM 8.a. PREVIOUS I ioisil0CCURRENCES INCLUDE: 50-316/81-15. I lo171I I 10181I l CODE C0OE SUBCODE COMPONENT CODE SU8C dE SU E lol9l8 11 lB IO LEj@ [A_J @ l R l E I L l A l Y l X l@ y@ lZ_J @

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44 33 42 43 47 CAUSE DESCRIPTION AND CORRECTIVE ACTIONS h li l 0 l l INVESTIGATION REVEALED THAT THE DEGRADED GRID V0LTAGE RELAYS ACTUATED AT THE FOLLOWING 1 ii ii i lV0LTAGES; RELAY 27-T11A-2 AT 3577 V0LTS, RELAY 27-TllD-1 AT 3626 VOLTS AND RELAY I 1

, , l27-T11D-2 AT 37'O VOLTS. THESE V0LTAGES EXCEEDED THE TOLERANCE ALLOWED BY TECHNICAL g,,3i l SPECIFICATION OF 3596 V0LTS PLUS OR MINUS 18 V0LTS. THE DIESEL START AND LOAD SHEDDING l i, i4 i l RELAYS ACTUATED AT THE FOLLOWING V0LTAGES; RELAY 27-lTilA AT 3175 VOLTS, RELAY l

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616-465-5901

,D kDo o!o0h5 R. A. PALMER pnONE: 2,

e e p SUPPLEMENT TO LER #81-017/03L-0 CAUSE DESCRIPTION AND CORRECTIVE ACTIONS (cont.)

27-3T11A AT 3238 V0LTS, RELAY 27-2T11B AT 3164, RELAY 27-3T11B AT 3220 VOLTS, RELAY 27.2T11C AT 3227 V0LTS, RELAY 27-3TllC AT 3234 VOLTS, RELAY 27-1T110 AT 3238 AND RELAY 27-3TllD AT 3105 V0LTS. THESE V0LTAGES EXCEEDED THE TOLERANCE ALLOWED BY TECHNICAL SPECIFICATION OF 3196 VOLTS PLUS OR MINUS 18 VOLTS. THF. RELAYS-WERE ADJUSTED TO WITHIN ALLOWABLE LIMITS. THESE RELAYS ARE MANUFACTUFED BY GENERAL ELECTRIC,~MODEL NGV13. AN ENGINEERING REVIEW IS IN PROGRESS TO EVALUATE THE TECHNICAL SPECIFICATION TOLERANCES AND TYPE-0F RELAY USED.

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