ML19350E237

LER 81-026/03L-0:on 810514,erratic Behavior Noted on Both 2-203-3B Electromatic Safety Relief Valve Acoustic Monitor Sensor & Pilot Valve Discharge Temp Element.Caused by Open Thermocouple & Short Ground in Acoustic Sensor Cable

ML19350E237
Person / Time
Site:	Dresden
Issue date:	06/12/1981
From:	Speroff R COMMONWEALTH EDISON CO.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION III)
Shared Package
ML19350E236	List: ML19350E235 ML19350E237
References
LER-81-026-03L, LER-81-26-3L, NUDOCS 8106170191
Download: ML19350E237 (1)

Text

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NRC PCRA4 385 - - - - - - - - --

U.S. NUCLEAR REGULATORY COMMISSION (7 T/l i LICENSEE EVENT REPORT  ;

CoNTRot BLoCx: l l l l l l l@ (PLE4sE PRINT OR TYPE ALL REQUIRED INPQRMATION) lo l1l8 I9 Il LlUCENSEE

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Dl Rl Coot Sl 2 l@l 14 018 l 0 l - l 0 l UCENSE 0 l 0 NUMSER l 0 l 0 l- l0 l0 l@l 25 4 l 1UCENSE 28 l 1 ( TYPE l l 140l@l57 CAT l 58 l@

CON'T

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loli 7 8 1% l 60L@l 01 5 l 0coCKET83

! 0NUMSER l 0 l 2 l 368l 7 68@l 015 EVENT oATE l1 l4 18 l1 @l0l6l1l218l1i@

74 75 Pi* ORT LATE $0 EVENT DESCRIPT1CN AND PROBABLE CONSEQUENCES h io #2; [ During normal dperation, erratic behavior was noted on both the 2-203-3B electro-stic l

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i gl saf ety re. lief valve ~ air.UisteHimhnitor- sensor. and pilot valve-discharge temperature l

, i o ,, i l element. Acoustic monitor manufactured by NDT International and thermocouple by J

,o,3,  ; Control Products, C615. Minimal effect.upon public health and safety because redundant;

, o , ,- y l 6:CS systems were available, remaining four safety / relief valve indications were  ;

jo,7; l tunctional and valve opening would De indicated as a reduction in megawatt output or l

,o ,,, bypass valve position. First occurrence of this type. g 7 es 80 SYSTEM CAUSE CAUSE COMP. VALVE CODE CCOE SUSCoot COMPONENT CooE SUSCo0E SU8 Coot 10 l 9 l' 7 8 l Il Elh Wh l A lh l Il Nl S l Tl R l U lh lE l@ l Zlh 9 10 11 12 13 18 19 20 SEoWENTIAL CCCURRENCE REPORT REvi$loN LER EVENT YEAR REPORT No. CODE TYPE No.

O aeg/Ro su 18111 1-1 lo 12 is I l/l 1013I l Ll l-l 6

_2 22 22 24 28 27 28 2s 20 si 22 P T MCTH hours $8 i PcR 8. U MA UP RER _

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22 24 lJJ@

2s lZlh 28 3 l0l0l0l0l 40 lN 4

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42 lasX l@ !u X l9 19 [947l@. --

CAUSE DESCRIPTION AND CORRECTIVE ACTICNS h

, Ii!o_j l Failure of temperature element believed cae to open thermocouple. Failure of acoustic l

[") m i monitor due to a short to g ound in the acoustic sensor cable. I==ediate action was tol l repair acoustic monitor by raversing connection to sensor. The safety relief valve was;

,,,3, j lifted to verify acoustic monin.r operability. Repairs to thermocouple will be made l i, ,,,j during next outage of sufficient length. ,

7 8 9 80 A  % POWER oTHER STATUS olSco Y 015CoVERY CE5CRIPTIoN l1 158 l l E l@ l 0l 5 l 6l@[ N/A l y @l Operator observation l 7 1 12 1*J 44 48 48 40 s.EtaAsEo op RELsAca LOCATION oP RELEASE @

l N/AAMouNTcP ACriv Ty hl l N/A l li 188 sl I Z l kb@tv 7 ie - -

PERSONNEL EXPOSURES

= 48 80 NUMSER TYPE DESCRIPTtoN i

11171 l 0 l 0 l 0 @l Z l@l' l PERsoNNE'L INJU E3 l NUMSER DESCPIPTICN N/A li la 8l l9 0 l 010 l@l12 7 11 80 l

LoS5 CP CM QAMAGE To PAC!UTY Q TYPE DESCRIPT1cN  %,/

N/A l__

l7 t I s8 l 9l Z l@l10 80 N8 NRC USE CNI.Y ,

12tolINU@]l,$,go, @ N/A I IIIIIIItiiiili 81061 7 0 e\

Randy D. Speroft 8Y5-942-2920

. . . . . _ NAME nF PaspanPa, . DH nN S- *

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