ML112760123

Forwards LER 78-018/03L-0

ML112760123
Person / Time
Site:	Monticello
Issue date:	10/25/1978
From:	Mayer L Northern States Power Co
To:	James Keppler NRC/OI/RGN-III/FO
Shared Package
ML112760124	List: ML112760123
References
NUDOCS 7810300191
Download: ML112760123 (3)

Text

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REGULATOR*NFORMATION DISTRIBUTION OSTEM DOCKET NBR: 050-263 MONTICELLO DOC DATE: 781025 RECIPIENT: KEPPLER, J.G. ACCESSION NBR: 7810300191 ORIGINATOR: MAYER, L.O. COPIES RECEIVED:

COMPANY NAME: N STATES PWR LTR 1 ENCL 1

SUBJECT:

SIZE: 1+1 LER#78-018/03L-0 on 781002: HPCI temp switch failed to trip caused by loose wire inside switch; wire probably pulled loose when switch removed for calibr. Switch replaced & procedures revised.

NOTARIZED LISTRTRUTI!ON C011'El An02 DISTP!pUTTUN TITLEl INCID)ENT REPODRTS NAME ENCL? FOR ACTION BR CHTFF W/4 ENCL

• ORB#3 BC

/ENCL NRC PnR W/E NCCL TRE W/2 ENCL MIPC W/3 ENCL I & C SYSTEMS BR J/FNCL NOVAK/CHECK W/ENCL

• EEB W/ENCL AD FOR ENG P /FkNCL PLANT sYSTEPS iRR W/ENCL HANAUER W/ENCL AD FOR PLANT 'SYSTEMS k/ENCL AD FOR SYS & PROJ W/ENCL REACTrP SAFETY RR W/ENCL ENGINEERING BR W/ENCL KREGER/J. CO)LLINS W/ENCL I.

POWER SYS BR W/ENCL K SEYFRIT/IE W/ENCL LPDR W/ENCL NSIC W/ENCL ACRS W/16 ENCL TOTAL NUMBER OF COPIES REPUIREDI LTP 9.2 ENCL qjA NOV 1978 NOTES: HEAD HEDTO HEAD Al0

NORTHERN STATES POWER COMPANY MINNEAPOLIS, MINNESOTA 55401 October 25, 1978 Mr J G Keppler Office of Inspection & Enforcement U S Nuclear Regulatory Commission 799 Roosevelt Road Glen Ellyn, IL 60137

Dear MIr Keppler:

MONTICELLO NUCLEAR GENERATING PLANT Docket No. 50-263 License No. DPR-22 Failed HPCI Area Temperature Suitch.

The Licensee Event Report for this occurrence is reproduced on the back of this letter. Enclosed are three copies.

This event is reported in compliance with Technical Specification 6.7.B.2.(a) since it represents operation with an inoperable instrument under conditions in which all protective functions were still available.

Yours very truly, L 0 Mayer, PE Manager of Nuclear Support Services LOM/DHM/ ak cc: Director, IE, USNRC (30)

Director, MIPC, USNRC (3)

MPCA Attn: J W Ferman 0o 781030 O1q1/ S 9l -over-

NRC FOR M 366 U. S. NUCLEAR REGULATORY COMMtSSON (7-77)

LICENSEE EVENT REPORT CONTROL BLOCK. (PLEASE PRINT OR TYPE ALL REQUIRED INFORMATION)

I MINJ MINIP 1 ()1Q0 101-101 01 0 010 1 -0 10 25 26 4 111 LICENSE TYPE 30 57 CAT 58 7 11 ' LICENSEE CO!lE 14 15 LICENSE NUMBER CONT REPORT 1L~0 10 6 3 (l11 ET D2 17 18 1 0 lo 91 718 I26 a1so GL....2Q11 SOURCE 15 0_I0 NO B REPORT DATE 80 60 61 EVENT DESCRIPTION AND PROBABLE CONSEQUENCES DOCKET NUMBEP so) 68 69 EVENT DATE 74 75 I

temperature switches

( During a routine surveillance test one of the HPCI isolation I failed to trip as required by Tec:hnical Specification 3.2.A. The redundant j Lswitches were operable and isolation would have been initiated as required. No 019 effect up~on public health and safety- Three previous orjirrpnrpq reported in IAO-38. AO-74-01 and M-RO-77-07.

80 SYSTEM CAUSE CAUSE COMP VALVE CODE CODE SUBCODE COMPONENT CODE SUBCODE SUBCODE 7 8 ISlID-9 10 11 12

. 13 IWNISITIRIJ 18 L L i 19 20 REVISION SEQUENTIAL OCCURRENCE . REPORT -

REPORT NO. CODE TYPE No LE RO EVENT YEAR 1P21 L 22 R P---

23 Ini 111L8 1 L.

24 26 27

. WI 28 29 W

30

[I1-.

31 32 ACTION FUTURE EFFECT SHUTDOWN ATTACHMENT NPRD-4 PRIME COMP. COMPONENT TAKEN ACTION ON PLANT METHOD HOURS 02 SUBMITTED FORM SUB. SUPPLIER MANUFACTURER 33 11081 H 34 Ii Lz.@

LA.J@LJ@ 35 (D LzIN@I3N15 LJO lolololol 36 37 40 LWJ Lxi 41 Ix@

42 43 NU 1F 10 18 11 Cf) 44 41 CAUSE DESCRIPTION AND CORRECTIVE ACTIONS 1 Switch-failed to trip due to a loosE wire inside switch. Wire was probably pulled 1 Iloose when switch was removed for c~ilibration. Switch is a Model 17023-6.

11000 +

1 600'F temperature range. S witch was replaced. Handling methods will be S revised to minimize possibility of similar failures. Redundant switches

.4 Itested satisfactorLily.

7 8 9 METHOD OF 80 FACILITY STATUS  % POWER OTHER STATUS DISCOVERY DISCOVERY DESCRIPTION 17 IE@ 10 1 61 01& NA I BnJDI Surveillance Test 1

. 9 10 12 13 44 45 46 80 ACTIVITY CONTENT RELEASED Or RELEASE AMOUNT OF ACTIVITY LOCATION OF RELEASE I NA 7

" R 9

@ jg 10 11 NA 44 45 80 80 PERSONNEL EXPOSURES NUMBER TYPE DESCRIPTION W lol o10 lJL 8 9 11 12 13 NA 80 PERSONNEL INJURIES

%UMBER DESCRIPTIONO

/

W8 9 1 010 _(D)I 11 12 NA 80 LOSS OF OR DAMAGE TO FACILITY TYPE DESCRIPTION

, 8 9 10 B0 PUBLICITY NRC USE ONLY ISSUED DESCRIPTION F2 0I ILN A 7 7 9 0 10 68 69 80 5 7813QA1/FkEPARER PHONE_612-295-5151 o W