ML20127B740

Ler:On 750123,informed That Damaged CRD Connector Resulted in False Indication for One Control Rod.Connector Repaired, Bypass Removed

ML20127B740
Person / Time
Site:	Monticello
Issue date:	01/31/1975
From:	Clarity M, Mayer L NORTHERN STATES POWER CO.
To:	Giambusso A NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION III)
References
LER-LER-750131, NUDOCS 9102130557
Download: ML20127B740 (2)

Text

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CONTROL BLOCK:l l l l l l l pLgAgg PRWT ALL EgednE3 WPORGA?. TION)

, e 1 6 NAME LCENSE NUMBER E TY P1 l ulN lM lN l P l 1l bl 0l-l0 l 0 l 0 l 0 l 0l-l 0l 0] l4 l1 l1 l1 l1 l. l0l1l 32 7 89 14 15 25 26 30 31 CATEcoRv "N S$N T coCKET NUMBER EVENT DATE REPORT oATE O 1 CON'T l P l Ol W (_L_j l 0l 5l 0l-10 l2 l 6 l 3 ] l0l112l3l7l Sj l 0 l 1l 3l1 l 7l 5l 7 8 57 58 59 60 01 68 69 74 75 80 EVENT DESCRIPTION BE l During refueling, da:anged CRD connector resulted in false indication for one control l 7 89 80 EE l rod. Rod was verified fully inserted and rod position interlock for that rod 80 l

7 89

@l vas bypassed. Refueling continued two hours. Bypass violated limiting condition 80 l

7 89 0 l for operation. No previous occurrence. Connector repaired, bypass removed. l 7 89 80

@l 7 89 (A0 263/75-04) pmg 80 l

CODE COMPONENT CODE M ACTUNA VOLATON E lRlBl lA l 7 89 10 11 lIlNl SIT lRlUl 12 17 lN l 43

[C]0l7lSl47 44 W 48 CAUSE DESCRIPTION DE l coerator Error. Electrically disarmed the CRD and repaired the connector.

80 l

7 89 3E l Discussed occurrence with shift supervisors.

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7 89 1 I I FACLITy METHOD OF STATUS  % POWER OTHER STATUS DISCOVERY DtSCOVERY DESCRIPTON lolol ol I 1

h_l n I LAj  ! NA l 7 8 9 10 12 13 44 45 46 80 E ED OF ASE AMOUNT OF ACTIVITY LOCATON OF RELEASE i l NA I I NA l LzJ 1.2J 7 8 9 10 11 44 45 80 PERSONNEL EXPOSURES NUMBER TYPE DESCRDTON M l 0 l 0l 0l [Zj l NA l 7 89 11 12 13 80 PERSONNEL INJURIES NUMBER DESCRIPTON 3 l0l0l0l11 12l 7 89 NA 80 l

OFFSffE CONSEQUENCES hl 7 89 NA 80 l

LOSS OR OAMAGE TO FACIUTY TYPE DESCRIPTON D2 Lz.I l NA -l 7 89 10 80 PUBLICITY DE I NA ,

l 7 89 80 AOOmNAL MCTOR3 "-

9102130557 750131 I ~

E l NA PDR ADOCK 03000263' l 7 89 S PDRj , , , ,, , gg

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=st t-m 80 l

NAME: Mo renn ClaH tv P' ME. 612-295-5151

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NORTHERN 5TATES POWER COMPANY r" M I N N E A PO bl S, M I N N E SOTA 5 3401 Jtnuary 31, 1975

's Mr. A. Giambusso, Director Division of Reactor Licensing r-(

" '- A i / L k NB j U S Nuclear Regulatory Commission Wishington, DC 20555 S] FEBS1975 *.-o g_- .

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mf Dae.r Mr. Giambusso: 'A ,- <

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./lg -te a..o MONTICELLO NUCLEAR GENERATING PIANT '" N /h%6 Docket No. 50-263 License No. DPR-22 Licensee Event Report to the NRC Refueling Interlock Bypass The Licensee Event Report for this occurrence is reproduced on the back of this letter, Yours very truly,.

+ '0-L 0 Mayer, PE Manager of Nuclear Support Services LCN/MHV/yb cc: J G Keppler G Charnoff Minnesota Pollution Control Agency /

Attn: E A Pryzina l

1378 <'

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