ML19309E760

LER 80-015/03L-0:on 800320,during Operation at Approx 60% Power,Emergency Feedwater Header Supply to Loop 2 Helium Circulation Water Turbine Drives Was Isolated to Repair Leaking Pressure Control Valve.Caused by Loose Block Bolt

ML19309E760
Person / Time
Site:	Fort Saint Vrain
Issue date:	04/18/1980
From:	Gahm J PUBLIC SERVICE CO. OF COLORADO
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION IV)
Shared Package
ML19309E759	List: ML19309E757 ML19309E760
References
LER-80-015-03L, LER-80-15-3L, NUDOCS 8004240328
Download: ML19309E760 (1)

Text

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NRC FORM 366 U.S. NUCLEAR REGULATORY COMMISSitN

'T.77)

LICENSEE EVENT REPORT CONTROL BLOCK: l l l l l l lh (PLEASE PRINT OR TYPE ALL REQUIRED INFORMATION) lo lil8l 9C l 0LICENSEE 7

l F l CODE S lV l 1 l@l 010 l- l 0LICENSE 14 15 l0 l0 l010 l- l0 l0 25l@l4 NUMBER 26 l1LICENSE l1 l2TYPE l 0 JOl@l 57 CAT l 58 l@

CON'T IoI11 s$RCI60 l L l@l 0 l 5OOCKET l 0 lNUM8ER 0 l0 l 2 l 686 l 769 @lEVENT 0 l 312 l0 l 8 l075 l@l0 74 REPORT l4 CATE l1 l 8 l 808 l0 l@

7 8 61 DATE EVENT OESCRIPTION AND PROB ABLE CONSEQUENCES h l o l 21 l From 1105 to 1505 hours0.0174 days <br />0.418 hours <br />0.00249 weeks <br />5.726525e-4 months <br /> on March 20, 1980, with the plant operating at approximately l lo lal 1 60% thermal power and 216 MWe, the emergency feedwater header supply to Loop 2 helium l l o la I [ circulator water turbine driver was isolated to repair a leaking pressure control l Ioisl l valve. This resulted in operation in a degraded mode of LCO 4.2.2(a) and is re- l ITTs 1 l portable per Fort St. Vrain Technical Specification AC 7.5.2(b)2. No accompanying l

[ol7l l occurrence or probable consequences. No affect on public health or safety. l l0l8l l 80 7 8 9 E COE SUSC E COMPON ENT CODE 508 ODE SU E lo19l lH lH l@ y@ l Bl@ l Vl Al Ll Vl El Xl@ l Fl@ lHl@ 13 18 19 20 7 8 9 10 11 12

_ SEQUENTI AL OCCURRENCE REPCRT REVISION LER EVENT YEAR R EPORT NO. COOE TYPE NO.

@ ygg'R0 I 8 l 01 a

l-l l 01 11 5l l/l 10131 lLI l-l 10l

,_ 21 22 23 24 26 27 28 29 30 31 32 K N AC C O P NT ME HOURS S8 i POR 8. SUPPLI MANUPAC RER Ls_J@lz_J@ Lz_J@ LIJ@ l 01 01 01 01 IV l@ l42Ni@ IN l@ In 11 12 l047l@

33 34 33 36 31 40 41 43 44 CAUSE DESCRIPTION ANO CORRECTIVE ACTIONS h lilol lCause of valve leakage was a loose bole on hinck .rh4 rb i n ch nn a m *

• sta - mh I g istem of a Masoneilan pressure control valve. This did not allow proper stroking, _i i,;7, lresulting in valve leakage. Block cleaned and re-assembled. Valve stroke calibrated. J i, ;3l l Valve and system returned to service. No further corrective action anticipated or l

[il4[ l required. l 7 a 9 80 ST  % POWER oTHER STATUS 015 O RY DISCOVERY OESCRIPTION l1 l5 l l E l@ l 0l 6l 0l@lN/A l l Al@l Personnel Observation l ACTIVITY CC TENT RELEASED vP AELEASE AMOUNT OF ACTIVITY LOCATION OF RELEASE It i6I l Z l lZh!N/A l l N/A l 7 3 3 10 11 44 45 80 PERSONNEL ExPOSUMES NUM8ER TYPE OESCRIPTION 39 l l i 17 l l 0 l 0 l 0 l@l Z l@l N/A l l PERSON ~EL mu'AEs NUMBER DESCRIPTION li t a8l 31010101@l 12N/A 7 11 80 I

'#$ Eo'i s'C"^i1 cN' ' '^c' " @ 8004240 3Jgl~

l t l 9d l 9l Z l@ltoN/A 7 80 PUBLICITY NRC USE ONLY

'SSU E D OESCRIPTION l2 l0l l N l l N/A l llll!ll!!!lI l$*'

7 8 3 to a p 68 69 80 ;,

M (\,,a _\.w % 0 /M . . . . NOU 785-2253 9'