ML19095A715

LER 1975-018-00 for Surry Power Station, Unit 1, While Unit 1 Was Operating at 99.5% Power, a Loop at Instrumentation Drifted Low Which Resulted in at Safety System Setting Being Less Conservative than Setting in Technical Specification 2.3

ML19095A715
Person / Time
Site:	Surry
Issue date:	10/03/1975
From:	Stallings C Virginia Electric & Power Co (VEPCO)
To:	Moseley N NRC/IE, NRC/RGN-II
References
Serial No. 717 LER 1975-018-00
Download: ML19095A715 (2)

Text

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VIRGIN!~ ELECTRIC**AND POWER.COMPANY

• . R10HMOND,VIRGINIA 23261 October 3,. 1975

• Mr *. Nor~n .C ~ -M9aeiey, Direc:to'X' .* , ,. , -,g~rial: No. *717 Offic~ of Inspection'and Enforcement . * .: PO&M/JTB:'clwi.

• United States .Nuclear, Regulatory Coilllll:Lssion .

.. Region*: II ..:.. Suite 818 .. . ' . ,

• Docket; No*s. 50-280 .

.* 230 Peach tree St'reS:t ~

• Nortllw~st: . '. License :i:{os~ '..DPR~32>> -

l\.tlant:a ,.

• deorg-ia .: 30303 * . , -

i>.ear , Mr~. Moseley:

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-- .. 'Pursuaiitito Stjriy:P~w~~rst:1:1011,/T~~h~~ca{ ~peclficatfon 6.6.B.1,*

• the VirgiJiia :*Electric *and Power . Company :hereby *submits forty (l~O) copies.

-~f Abno~al Occurrence :Report No *. Ab~Sl-75..:.13. *- ...

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, <:*,; -'. :"i1*Th~}subs,tanc; j,f :t~is*'~e~ort'.has :b~e~ i;~v:{~tofed:j,;,'i~tii:/stat:1.on -N~tle,ar *.

Saf~ty anl_'Operatirig <*Committ;:ee*,aud -idll* be plE;Icecf on.:thel ag-~da for the. ,-

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Aext niee~in:g"c>f the System

. *. . . Nuciear Saf~ty ancf Opera~ing -,Comirltt_ee.' .* - '

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LICENSEE EVENT REPORT AO-Sl-75-18 CONTROL BLOCK: _I~,__* I I I 1 *

.J6 [PL * ..: PmmT ALL P.Eoumi:o 1r.lFOR1v1AnomJ

. LICENSEE LICENSE EVENT Nl,ME LICENSE NUMBER TYPE TYPE

@ill 7 8 9 I vi A Is IP I sI 114I Io! 15 01-10101010101-101025I 1411 26 1111101 30 11 I31o I 32 REPORT REPORT CATEGORY TYPE. SOURCE OOCK~T NUMBER EVENT OATE REPORT DATE

@E]coN'T jP lo I Lu L!:J t9.__b_l_Q__I - I o I 2 I s I o I Io! 91 21 417 is! 111010121 7j.2J 7 8 57 58 59 60 61 68 69 74 75 80 EVENT DESCRIPTION

@:§ !While Unit No .. 1 was operating at 99.5% power, 11 A" loop t.T instrumentation drifted low J 7 8 9 80

@@] jwhich resulted in the l'lT safety system setting being less conservative than the set- J 7 8 9 80

@BJ lting in the Technical Specification 2.3.A.2. The overpower b.T and overtemperature l'lT J 7 B 9 80

.@EJ ~1ere placed in the trip mode on 11 A" loop and the cause of the occurrence was investi- :J 7 8 9 80 lli:ffiJ I gated. (AO-Sl-75-18) ,_ _ _J 7 B 9 PRIME 80 SYSTEM CAUSE COMPONENT COMPONENT CODE CODE COMPONENT CODE SUPPUER MANUFACTURER VIOLATION 7

@El 8 9 LI.W 10 Lu11 I I IN I s I TI RI u 17I 12 L!U43 IR j 3 I 7 I O j 44 47

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48 CAUSE DESCRIPTION

@I§] I A Rosemount Engineering Company, Model 176KF RTD on "A" loop (T Hot) dr~fted lo~.:_!hisj 7 B 9

• BD

@laj Lwas due to the high moisture content in that section of the containment atmosp_he:::_:____ j 7

EJ21B 9J which caused insulation resistance to ground to decrease. The RTD will be re- (con_,'._:_!J

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7 EEJ 7

B g 8

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FACILITY STATUS 9

FORM OF ACTIVITY

'ID

% POWER I o I 91 CONTENT 9j 12 13 N/A OTHER STATUS 44 METHOD OF DISCOVERY uJ 45 DISCOVERY DESCRIPTION l_Qperator observation 46

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1 GO 80 I

rn RELEASED OF RELEASE AMOUNT OF ACTIVITY LOCATION OF RELEASE I~ wl N/A ......_N_/_A_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ ,J 7 8 9 10 11 44 45 80 PERSONNEL EXPOSURES NUMBER TYPE DESCRIPTION 7

[iEJ l QI ol o I 8 9 11 uJ 12 13 N/A 80 J

PERSONNEL INJURiES NUMBER DESCRIPTION 7

ET~8 9Lo Lol o11I 1I'N/; :A: 2 : - - - ' - - - - - - - - - - - - - - - - - - - - - ._J 80 0FFSITE CONSEQUENCES

.13)) N/ A J

I 7 B 9 80 LOSS OR DMvlAGE TO FACILITY TYPE DESCRIPTION lili ~ I N/A ___J 7 8 9 10 80 PUBLICITY

[i1?J L_!VA ,J 7 89 ----------------------------------~ BO ADDITIONAL FACTORS 7

ETu) 0.9 l CAUSE DESCRIPTION (con't): p~ire~_or replaced.

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E. M. Sweeney, Jr. (804) 357-3184 NAME*:_ - - - - - - - - - - - - - - - - - - - - - PHONE: _ __

GPO llOl-667