ML20127L308

Ler:On 750727,during Testing of RHR Torus Cooling Injection Valve Mo 2008,operator Motor Failed Due to Stalled Rotor Current.Caused by Limit Switches Failing to de-energize. Affected Parts Replaced

ML20127L308
Person / Time
Site:	Monticello
Issue date:	08/05/1975
From:	Day B, Mayer L NORTHERN STATES POWER CO.
To:	Giambusso A Office of Nuclear Reactor Regulation
References
LER-LER-750805, NUDOCS 9211230489
Download: ML20127L308 (2)

Text

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NORTHERN STATES POWEhCOMPANY

/ l MIN N E AfDM S. MIN N E S OTA 88400

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X 1 August 4 1975 <9, yA j

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Mr. A. Giambusso, Director I

Q Division of Reactor Licensing U. S. Nuclear Regulatory Comission ,w Q^

Washington, DC 20555 s Q f { hi[ /

Dear Mr. Giambusso:

MONTICELLO NUCLEAR GENERATING PIANT Docket No. 50-263 License No. DPR-22 Licensee Event Report to the NRC Inoperable Torus Cooling Injection Valve The Licensee Event Report for this occurrence is reproduced on the back of this letter.

Yours very truly, c),

Manager, Nuclear Support Services /

8h L ai/IMM/ deb L-cc: J. G. Keppler 8- . A ug 2 l $f' ig G. Charnof f p T ,

MPCA Ng f f.

Attn. J. W. Ferman g l l 1 i

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L 8514 9211230499 750005 l hDR ADOCK 05000263

PDR .

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. LICENSEE EVENT REPORT CONTROL BLOCK:( l l l l l l (PLEAM PAINT All REGUIRED INFORM ATtDN) 1 6 L CE NSI (VI NT (CEN$tt T YPt TYPI LCENSE NUMBf R ,

NAME

-@B is IN la IN le i 11 l Ol 01-10 lo Io lo_l o I-In I nl 25 Ic 26 li li li_ Lt_i 30 inIiI32 31 7 99 14 15 EVENT DATE REPORT Datt

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CATEGC4Y 01 CON 7 l P l (j T

[T_j M DOCKET NUMBER l0I SI 0l-l 0l 2l6 l368l 1017l2l7l7l1l 74 lol8lolSI7I5l 7b 80 7 0 57 EB 59 60 61 69 ,

EVENT DESCRIPTION 99 IDuring test RHR torus cooling iniection valve Mo 2008 operator motor f ailed due to I 80 7 89 nccurrenco!

$ l stalled rotor current. Unstrean isointion vnive Mn ?nn6 nnnrnhin nt tten nf 7 89 80 h (Two previous similar occurrences reported. Affected part repaired. Component modifi-) 80 7 89 -

h Ications in proeress(Ao 261/75-13 ) 80 7 89 I EE i 7 89 ns 80

$ysTE M CAUSE COM8W N1 COM80NtNT Spit t p MANUF ACTU64 R VtXA T ON Coot CODE COM8)CNf NT CODE E is !8 i LU I vlA It lv lo i rl17 Lt_1 43 44 in 1 3 I, la I 47 Lu.J 48 7 89 10 11 12 CAUSE DESCRIPTION l

Q lA Rotork Model 70A valve operator motor stalled because limit switches failed to BO 7 89 BE lde-energize motor windings at prescribed noint in valve onenine trnvn1- 14mir cuitch I 00 7 89 H lsrenn4nt am.inr4nm cm.,cma u. 1 _ cc- e _ mu mm4mm <. , u,, c - e m me,rm m. 4 - l 80 7 89 F ACUT y .METHOO OF DISCOVEHy DiSCOviny DE SCfwP f 40N STATUS  % POW E A OTHER STATUS .

1 !nl7 l1 l lN/A l l N/A 80 l

7 8 9 10 12 13 44 45 46 FOnu OF OF EL SE AM OUN T Of ACTNITY LOCAT3ON OF 9ELLASE RELE SED 1 l,,7_)  ! N/A  ! N /A I _

10 11 44 45 80 7 8 9 PERSONNEL EXPOSURES NUM0tR TYPf DESCRiPT'CN

_,l 81010 I o l trJ 7 89 11 12 l

13 N/A 80 PERSONNEL INJURIES NUMi1EA DESCRIPTION N lo 10 I o l I N /A l 7 89 11 12 80 OFFSITE CONSEQUENCES l

Ql 7 89 N/A OO LOSS OR DAMAGE TO FACILITY TYPE DE SCniPT ON

.l QWl 7 80 10 N/A <

80 PUBLICITY ~

N/A j M l 80 7 80 ADDITIONAL FACTORS Q [Cause Description (cont'd) valve' operation. Stem clamp loose because stem clamp l 7 89 80 Iset nerew shenred. tarcer ser nereus inntn11nd. I 7 89 eO D. Day I NAME: Bvr( / HONE: (612) 295-5151 GF 0 nat.467

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