ML20085E514

LER ER-76-017:on 760520,one of 24 Reactor Protective Matrix Relays Failed to Operate.Apparently Caused by Mercury Wetted Contacts.Replacement Relays Tested

ML20085E514
Person / Time
Site:	Palisades
Issue date:	09/22/1976
From:	Bixel D CONSUMERS ENERGY CO. (FORMERLY CONSUMERS POWER CO.)
To:	James Keppler NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION III)
References
LER-ER-76-017, LER-ER-76-17, NUDOCS 8308150176
Download: ML20085E514 (2)

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! UCENSEE EVENT REPORT

Palisades .

CONTROL BLOCK:l l l l l l l (ptgASE PRINT ALL REGUIRED INFOR84ATION) 1 6 ,

LEENSE NUMBER Y Q l MlIl Pl Al Ll1l l0 l 0 l_l 0l0 l 0 l 0 l 0l_l 0l 0 l l h l 1 l1l 1l130l l0l3l 32 7 89 14 15 25 26 31 DOCKET NUMBER EVENT DATE REPORT DATE TYPE U j O CONT l l l l 0l 5 l 0l-l Ol2 l 515 l l0 l 5 l 2l 0 l 7 l6 l l0 l 9 l 2 l217 l 6l

,' 7 8 57 58 59 60 61 88 69 74 75 80 EVENT DESCRIPTION DE IDuring routine testing it was found that one of the twenty-four RPS Matrix relays l 7 89 80

@ l failed to operate. Light tapping of the relay case appears to have resolved the l 7 89 80

@l l problem. Weekly testing of the relays has continued with no further problems l 7 89 80 l E l observed to date. 80 l

7 89 l 30 1 (ER-76-17) l 7 89 ,,,,, 80 E OCE COMPONENT CCOE VOLATcN

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7 89 10 11 l Rl ElL l AlY l Xl 12 17 W 43 44 l A l0l 5l5 l 47 l Nl 48

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9 CAUSE DESCRPTION HE l The cause of this failure appears to be associated with the mercury wetted l

! 7 89 80 i BE I centacts ( AntArz Mea w-2621-609) and is similar to that recorted treviousiv 80 I

7 89 3 l (UE-Th-1 ) . A selected crcur,of reelacement relays is currently being tested. l 89 (Contd L ne 18) 80 pa METHOO CF status  % POWER OTHER STATUS DrSCCVERY DGCOVERY DESCRPTCN

, 1 (E_l l0l5l0l l NA l (b_] l NA l 7 8 9 10 12 13 44 45 46 80 RE D CF AMOUNT CF ACTNrTY LOCATON OF RELEASE

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E 7 8 W

9 10 LEASE l 11 NA l 44 45 l NA 80 l

PERSONNEL EXPOSURES NUMBER fvPE CESCASTON H l 010101 LzJ 12 l

13 NA 80 I

I 7 89 11

! PERSONNEL INJURIES 1 NUMBER CESCASTON j Ql l 0l0 l 0l l NA l 7 89 11 12 80 PROBABLE CONSEQUENCES EE l Nene. The system is destened to terform its function with a failure of this tyte. l 7 89 80 LOSS OR OAMAGE TO FACILITY TYPE DESCRIPTON

$ [3] l NA l 7 89 10 80 PUBLICITY Ml NA 80 l

7 89 ADOITIONAL FACTORS 3 l A report on the results of these tests vill be completed within the next few weeks. l 7 89 80

@ l Resolution of the problem is expected to begin following review of the report. l i 7 89 80 8308150176 760922 PDR ADOCK 0500025

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6 3, CORSumerS 2 9 Power Ne/ Company v

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'] , :o General Omcas: 212 West Michigan Avenue. Jackson, Michigan 49201. Area Code S17 789-0550

)'l[ b September 22, 1976

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r .' Vg Mr James G. Keppler /- , , , , ,

Office of Inspection & Enforcement p_7 -

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Region III e 9 -

US Nuclear Regulatory Commission if o.nSEP 9 7 .O7ds 799 Roosevelt Road q -4(w g e Glen Ellyn, IL 60137  ;.

DOCKET 50-255, LICENSE DPR f s

PALISADES PLANT - ER-76 RPS MATRIX RELAYS The attached event report relates to a failure of an RPS Matrix relay at the Palisades Plant. This type of failure is reportable on a thi'rty-day basis but the report was inadvertently misplaced. The discovery of this emission was the result of the recent emphasis being placed on event reports and an extensive search for this event report which was mislaid during the plant review process.

In an effort to resolve this problem, the plant staff has instituted a formal method of maintaining control of all Palisades Plant event reports. This method of control vill be maintained until the Company computerized status system proves capable of performing this function.

As mentioned in the report, a testing program involving the selection of a re-placement relay is nearing completion. We have performed a series of tests on five different relays that were ordered to specification equivalent to the ex-isting relays. These relays (all dry contact type) have been subjected to a series of tests including surge current, seismic, operating time, etc. Pre-liminary results lead us to conclude that an acceptable replacement relay will

< be found.

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David A. Bixel (Signed)

David A. Bixel Assistant Nuclear Licensing Administrator c0PY SENT REGI /> _. 7725 J