ML20058L553

Ler:On 771030,main Steam Line Low Pressure Switch Setpoint Drift Occurred.Switch Reset

ML20058L553
Person / Time
Site:	Monticello
Issue date:	11/29/1977
From:	Hill W, Mayer L NORTHERN STATES POWER CO.
To:	James Keppler NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION III)
References
LER-LER-771129, NUDOCS 9105230323
Download: ML20058L553 (2)

Text

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NSP , d P NORTHERN STATES POWER O' A Y

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November 29, 1977 s

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Mr J G Keppler, Director, Region III Uj p

Office of Inspection & Enforcement - {. )

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U S Nuclear Regulatory Cotraission ,

799 Roosevelt Road t Glen Ellyn, IL 60137  %

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Dear Mr Keppler:

MONTICELLO NUCLEAR GENERATING PIANT '

Docket No. 50-263 License No. DPR-22 i

Main Steam Line Low Pressure Switch Setpoint Drift The Licensee Event Report for this occurrence is reproduced on the back of this letter. Enclosed are three copies.

Yours very truly,

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-1 L 0 Mayer, PE Manager of Nuclear Support Services LOM/MHV/deh cc: Director, IE, USNRC (30)

Director, MIPC, USNRC (3)

G Charnoff MPCA Attn: J W Ferman e

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773430033

LICENSEE EVENT REPORT '

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t. ex:t pRiuT u accuiRoo iure:uArion)

NA E LCENSE NUMBER vi 1 PL 8 l MI NI d N l P l 1l 7 89 l150l 0l-l0 l 0 l 0l 0l 0l-l0 l0 l l3 l1 l3 l3 l3 l l0l3l 14 25 2b 3D 31 32 CATE00Av [,[ Ocui$ D00nri NUMBEA 01 CONI l 7 B $7 l

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[ VE NT DAT[

l610l 510l-l Ol 21 6l 31 l 110l 3l 0 l 71 ~l l 111 l 2 l9 l 7l 7l ME C AT Caig 68 69 74 7D bJ EVENT DESCR;PTION 8 Irvrrvvc nyr m StravrILL;NE TEST.' MAIN SEAM LINE LOW PRESSURE ISOLATIO 7 e9

@ lToTvpFD AT S12 PSIC: THE tem SPEC REOUIRES E011;L "ID OR GPIAER TriAN 825 PSIG ba 7 e9 WITri A J

ba 7@8 l10 PSIG ALLOKABLE DETIATION. REDUNDANT DRESSURE SKITW WAS PS 2-134COPERABLE. j

@9lDecrT. OYr PRrrIOUS OCCURRENE. fM-RO- 77-321 bJ 7 85 }

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ODupONENT CDupONFN' uO CCLE 000E COMPONENT COOE SJ+" AR MANJ' ACTW 8 07 IS I Dl lc l lI IN ISl Tl R! Ul l Nl l El 0 l 7l 0l VOJf0N 7 89 10 11 12 17 43 44 47

[46 CAUSE DESCRIPilDN 30 7 89 l SrTPOINT DRIFT. SWITCH WAS PFtFT. SUBSEQUENT SATISFACIORY j bd 7@][DURDON 89 11-16-77. PRESSURE SWITCH IS A HARESDALE FDDEL B2T-A12SS.

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ST ATkiS  % POWEA METHOD OF 60 OTHEA STATES Ds0Gwipv 8

7 8 9 inj 10 ln!0101 In i IBI Im D$00VEnv DELOA.PTON 1

12 13 44 45 46 ACTwn y CONTENT 60 MLEAIE0 DF AEL E ASE AMOUNT OF ACTwn y 8

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Lij 10 11 l n i I m t00ATON OF AltEAtt -

I 44 45 FERSONNE. EXPOSURES 60 NUMBEA T vpf des 0ASTON 8 1 ni ntnl LiJ 7 89 l NA 11 12 13 '

1 PERSONNEL INJUR ES bD NUMBER DESCAPTON 810!0 lnl11 SpI n 7 89 j 60 OFFSITE CONSEGUENCE3

@ ( NS 7 89 l LOSS DR DAMAGE TD FACIUTY gg Tv pt ogsemp7eN

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PUBLCITY 60 81m 7 89 I 60 ADD TIONAL FACTDRS is ! NA 7 89 l bb EE h 7 89h I BD N At.f E - W. Hill

%Dra 622-295-5152