05000263/LER-1977-029

LER 77-29:on 771002,three Main Steam Line Area Temp Switches Found to Trip Above Allowable Tech Spec Setting.Switches recalibrated.W/771101 Ltr

ML20056B861
Person / Time
Site:	Monticello
Issue date:	11/01/1977
From:	Hill W, Mayer L NORTHERN STATES POWER CO.
To:	James Keppler NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION III)
References
LER-77-29, NUDOCS 9102130506
Download: ML20056B861 (2)

LER-2077-029,

Event date:
Report date:
2632077029R00 - NRC Website

text

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LICENSEE EVENT REPORT CCNT AOL BLOCK l l l l l l l [PLEASE PRINT mLL REQUIRED INFORM ATION)

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.aau ocENsE .u NT NAVE i'Cf NSt NJMEiE A ' v PE Tv&E 8 IMINIMINIPl1l 7 89 14 l 01 01-101 01 010101-10 lo I 1b ES l 4 l 1 l 1l 1l 1l 26 30 l0 l 3l 31 32 CA?tscAv $$[ stun Y [ coc=Et NsMet a hf NT CATE rdE PDAY LATE BCovT I I l [t_l l t.1 l 015 ! 0 l-l 01216 l 3 l 11 1010 l 2 l 7171 l1 l 11 of 117171 7 8 57 56 59 60 61 68 69 74 75 80 EkENT DESCAIFTICN BE I Durine a routine surveillance test three of the main steam line area temperature l 7 89 80

@ l switches were found to trip above the allowable tech spec setting. The redundant l 7 e9 60

$ l switches were operable. One previous occurrence. Switches recalibrated. l 7 89 80 BE I (n-no-77-29) l 7 89 BO am l l 7 89 ,,wE

- 80 S*!M CLEE COMPONENT COMPONENT Cl LCCF Cr-MPOfvf twt CODE SU54'L IE ra W Nut AC?uRE A VOLA'ON 7

C 89 10 lIlBl d IIINlSlT!RlUI17 [N_l lFl0l8l1l [NJ 11 12 43 44 47 48 C AUSE CESCRIPTION c l Setpoine drift. The switches are Fennal, Inc. Type 17002-40. Switches l 7 ea eO DE l recalibrated. l 7 89 80 1

I I 6 AC1 ', ' *E 'aOD OF s'A?us s LCAEA O'utA STATU5 0 5COi( Av O$COvt Av DE SIAS'lON 7 8 b

9 l0l0l0l l NA 10 44 l W l NA l 12 13 45 46 60 Act v tv CONTENT GE t E ASE D 05 LELEASE AMOUNT OF ACTivtT v LOCAf TON CF AELE ASE 7 6 i

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Wl NA 10 11 44 l l NA l 45 60 PEASCNNEL EXPCSUAES NcMf9f A *wt DEstop*cN 7 89 O 0 l 01 bl13NA 11 l

id gg i DE ASCNNEL fNJUA.ES l NuMEiE A DES:Ar? GN i

1 10 l 0 l 0l l NA l 7 69 1T 12 60 CFFSITE CONSEQUENCES I

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gg LOSS CA DAMAGE TO rACILITY TvrE Ot sC Actico

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' 89 9102130506 771101 80 CF ADOCK 05000263 ,'

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W J Hill 612-295-5151 i ue .. ...,

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NS9 NEGkATO.W C:E7npp~ u0?y NORTHERN STATES POWER COMPANY M S N N E A PO LI S. MI N N E S OTA 95401 November 1, 1977 '

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Mr J G Keppler, Director, Region III Office of Inspection & Enforcement

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(; .** 0-U S Nuclear Regulatory Cormiission '

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799 Roosevelt Road N(/ g Glen Ellyn, IL 60137 -

Dear Mr Keppler:

MONTICELLO NUCLEAR GENERATING PLANT Docket No. 50-263 License No. DPR-22 Main Steam Line Area Temperature 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, I

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

Director, MIPC-USNRC (3)

G Charnoff MPCA Attn: J W Terman Enc 1osure cs:s O fI li:V 3 7977

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