ML19296C253

LER 80-007/01T-0:on 800129,during Core Flush W/Rcs at 258 Psig,Relief Valve RC-404-ERV Opened.Apparently Caused by Spurious High Pressure Signal from Transmitter PT-103-1 When Technician Removed Cover of Transmitter During Review

ML19296C253
Person / Time
Site:	Calvert Cliffs
Issue date:	02/12/1980
From:	Davis S, Rizzo P BALTIMORE GAS & ELECTRIC CO.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I)
Shared Package
ML19296C249	List: ML19296C248 ML19296C253
References
LER-80-007-01T, LER-80-7-1T, NUDOCS 8002250457
Download: ML19296C253 (2)

Text

.c m ,m .. . .._ _m....m. -. m.

U-11)

g. .

LICENSEE EVENT REPORT (PLEASE PRINT OR TYPE ALL REQUIRED INFOnr.1ATION)

CONT Rol BLOCK: (( l l l l l 1 6 FETG I al LICENSEE 01 C CODE CI NI 1 @l 14 15 0101 -10101010101 LICENSE %VtlER

- 0 Ol@t4Ilill111j@l 2h 26 LICtNSE T YPE JO I

$7 C A I $8 ig 7 8 9 con'T 0 5l0101Ol3 1l7)@l011 2l918]0}@l012l1l2]8l0j@

o '

7 8 TS"C 60lL}@ 61 Cork ET NUYBER rel 63 EVENT C ATE 74 15 PEPORT D ATE 90 EVENT DESCRIPTICN AND pro 3 AGLE CONSEGUENCES o 2 l At approximately 1145 while conducting a core flush with the reactor coolant  ;

o 3 i system (RCS) at 258 psia, relief valve (PORV) RC-404-ERV opened. The coerator l 0 4 started all charging pumps, turned on all pressurizer heaters and stopped the l o s two operating reactor coolant pumps. The operator shut the PORV by going to l o is 1 I override. RCS pressure had decreased to 169 psia at 1148 when the PORV was j o 7 I shut. Shutdown coolinq with a flow of 6000 con remained in operation during '

I o a I the event. This is not a renetitive occurrence. 80 1,

7 8 9 C OE CO E SU8C E COMPONE NT CODE SL8 Code S E lol91 l Cl El@ [X_j@ l Z l@ l V l A l L l V l 0 l P l@ W@ W @

7 8 9 to 11 12 13 18 19 20 SEQUENTI AL OCCUR R E NCE REPORT R EVISION EVENT YE AR REPCRT NO. COD 6 TYPE N O.

W .'

t .

@ yg,q,pg R

Og 21 810l 22

[--J 23 l0l0l71 24 26 M27 10 l 1 l 28 29

[T_J to l-l 31 32 TAKEN A TO C PLANT T HOURS S B ITT D FO SUS. S PPLIER MAN ACT RER

[JJ@lXl@ (_J.j@ [JJ@ l 0 ] 010 0l 37 l41 Y l@ lNl@ W@ D 2]4l3l@

33 34 35 36 40 42 43 44 47 CAUSE DESCRIPTION AND CORRECTIVE ACTIONS h i o l The apparent cause was a spurious high pressure signal from transmitter PT-103-1. l i i l At the reocrted time of the event, a technician was conductinn a review of l i 2 I instruments installed in the containment buildinn. The check reouired removing l 1 3 I the cover of PT-103-1 to visually verifv internal conoonents. The transmitter l

[il4 l l wds jolted when the cover was unscrewed. l 7 8 9 80 ST $  % PCWER OTHER STATUS ISCO RY DISCOVERY DESCRIPTION i s [Gj@ l 0l 0l Ol@l NA l [_Aj@l Operator Observation l

' ' ' " " '8 88 AC TiviTY CcTTE NT RELE ASED OF RE LE ASE AMOUNT OF ACTIVITY LOCATION OF RELE ASE 7

i s 8 9

[Zj @ W@l i0 11 NA 44 l

45 NA 80 PERSCNNEL EXPOSURES NUMSER TYPE DESCRIPTION -

1 7 0 lo l0 l NA l PE R SONNE t ,N;u' lie s NuMsER cESCRiPriON@

NA l I t 188 ]9l 010 l 0 l@l12 7 11 80 LOSS CF CR O AM AGE TO F ACILITY TYPE C E SC RIP TION i 9 (lj@l NA l so 7 8 9 to

. s u ,C7C oE R ,,T ,0N @ 80 022 50 yS7 NRC USE ONLY ,

12101 I N IOl NA l lIlll1lI IIIl$

7 a 9 to 68 69 80 ;

s,..E cF PREP A AE R

. . . . o PHONE. 3011269 4742/d7A6 E,

LER li0. 30-07/1T DOCKET fi0. 50-317 EVENT DATE 01/29/80 REPORT DATE 02/12/80 ATTAC:if tEf4T CAUSE DESCRIPTIOff RlD CORRECTIVE ACTIO!1S:

A shock of this nature has been known to cause this type of trans-mitter to change its electrical output. To check the operability of the transmitter the applicable nortion of a plant surveillance procedure was then satisfactorily performed which confirmed the proper operation of associated o'verpressure protection circuitry.

During normal plant operating conditions, this overpressure protection circuitry is disabled and PORV actuation is a function of the reactor protection system. .

' ~ ' '

PT-103-1 is a Fischer & Porter, Co. model #50EP1041BC balanced force motor type transmitter. The review being made was necessary for completion of response to ISE Bulletin 79-01, and was not a main-tenance action.

l-