05000263/LER-1977-022

LER 77-22:on 770828,MO-2013 B RHR Injection Valve Failed to Open.Control Relays Installed in Breaker to Reduce Control Wire Voltage drop.W/770927 Ltr

ML20056B867
Person / Time
Site:	Monticello
Issue date:	09/27/1977
From:	Mayer L, Tilly D NORTHERN STATES POWER CO.
To:	James Keppler NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION III)
References
LER-77-22, NUDOCS 9102130540
Download: ML20056B867 (2)

LER-2077-022,

Event date:
Report date:
2632077022R00 - NRC Website

text

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} LICENSEE EVENT REPORT CONTAOL BLOCK-l l l l l l l [PLEASE P; TNT ALL CEgumED INFORMATION) 1 6 eCE NSEE uCENSE EVENT NAME UCENSt NUMBER ?YPE Yvpf

@ lM lN l Ml NlP l1l {0 l 0l_ l 0 l 0l 0l 0l q -l 0l 0l l4l1l1l1l1l l0 l 3l 7 89 14 15 25 26 30 31 32 Cattconv Tvp[ EUb DOCmET NUMBEA EVENT CAff AEPOGT CATE 7 8 O CON T l l l lL l lLl l0 l510 l-l 0 l 2l 6l 3l l 0l Sl 2l 8 l 7 l 7l l0 l91 2l 7l 71 7l 57 58 59 60 61 68 69 74 75 80 l

EVENT DESCA;PTION f

BE I During test,M0-2013, "B" RHR injection valve failed to open. "A" RHR system oper- l l 7 89 80 l

, $ l able at time of occurrence. One previous similar occurrence. Control 7 89 relays in- l l 80 i

@ l stalled in breaker to reduce control wire voltage drop. (M-RO-77-22). l l

7 89 80

• l l 7 89 80 hl 7 89 l >

%, 80 ,

$UCE CON [ COMPONENT CODE .JPPL R M$ UAER v0LATON M l Sl Fl W 7 89 10 lC l K l T lB lR lK l 12 17 l Al 43 lG l0 l 8 l 0l lN l j 11 44 47 48 j CAUSE DESCAiPTION i Q l A GE 7700 line motor control center "open" contactor did not close as required l f 7 89 80  !

l b lwhen civen "open" signal. Control wire voltage drop during open signal prevented l  !

l 7 89 80 f J E5 l slightiv worn contactor from closing. Control wire for this valve approximately l l 5 F AClut y METHC3 0F STATES t POW E R OTHEA STATUS DISCOVE RY DISCOVERY DESCRIPTON i 1

7 8 ,9 d 10 l0 l9l Sl l NA 12 13 44 l W 45 46 l NA l 80 I ACTtviT v CONTE NT j 3* ELE ASI D OF E ACTivtTV LOCATON 08 AELEASE

< BE 7 8 Lz_J L' ELE ASEzJ l x^ AMOUNT l OFI NA I a

9 10 11 44 4E 80 FEASONNEL EXPOSUAES .  !

j NUVCE A it PE CE SC54PTON I DE I 01 0I0_I Lz_I I NA l 7 89 11 12 13 80 PERSONNEL INJUA ES teuMBE A DESCESTON '

H l 0l0 b l l NA 7 89 l 11 12 gg OFFSITE CONSEQUENCES DE I EA I 7 89 LOSS DA DAMAGE TO FACILITV 80  ;

4 '

' v ot DE SCnepTON Di LZJ 10l 7 89 NA l l

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80 PUBLICITY l l

DE I NA 7 89 l f 80  ;

l ADOiTIONAL raCTORS M l (Cause Description Continued) twice as long as for other safety relatcd valves. l i

7 89 gg Q l Control relays installed in breaker to reduce control wire voltage drop. l j

i 7 89 80 4

' NAME: Dean D Tilly pgggg WMFW I

' z vo een.se,

' 9102130540 770927 1

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• NORTHERN 5TATES POWER COMPANY w e N N z A potia. win N a s oTA es4oi 1

September 27, 1977 9

Mr J G Keppler, Director, Region III

+

Office of Inspection & Enforcement U S Nuclear Regulatory Corsnission 799 Roosevelt Road Glen Ellym, IL 60137

Dear Mr Keppler:

MONTICELLO NUCLEAR GENERATING PLANT Docket No. 50-263 License No. DPR-22 Failure of LPCI Injection Valve, MO 2013 The Licensee Event Report for this occurrence is reproduced on the back of this letter. Enclosed are three copies.

Yours very truly, r I

( 'f '1 L 0 Mayer, PE Manager of Nuclear Support Services LOM/MHV/deh k

\

cc: Director, IE, USNRC (30)

Director, MIPC, USNRC (3)

G Charnoff MPCA

Attn

J W Feman

~T.

LEP.2s1917 over -

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