ML19308D312

RO-77-24:on 770307,emergency Feedwater Pump Tripped Due to Overspeed During Main Steam Start Attempt.Caused by Steam Supply Valve Opening Faster than Governor Can Respond. Auxiliary Steam Supplied & Sys Declared Operable

ML19308D312
Person / Time
Site:	Crystal River
Issue date:	03/29/1977
From:	Stewart W FLORIDA POWER CORP.
To:
Shared Package
ML19308D305	List: ML19308D304 ML19308D312
References
NUDOCS 8002270756
Download: ML19308D312 (2)

Text

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'LIUENSkti EVENT REPORT

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o UCENSEE NAME UCENSE NUMCEn

• LCENSE TvPt EVENT TYPE k

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7 8 57 58 y lL l l0 EVENT cATE l5 l0 l-l 0l 3l 0l 2l l 0l 3l 0l 7 l 7 l7 l l0 l3 l2 l9 l 7l 7l REPORT CATE 59 60 61 68 69 74 75 80 EVENT CESCntpTION O2 l Operating in Mode 1, a start of the Turbine driven EWP was attemoted remotely using' Main l 7 89 60

@l Steam. The EWP tripped due to overspeed and was declared inoperable per Technical l 7 89 -

80 04 l Specification 3. 7.1. 2.b . Redundancy was maintained with the electric driven EWP. This l 7 89 80 l avere wie n ne rencef ei*rp nn r8 ni,m una regeored enprnbla timi n e AvM1fnrr9epe 14movm_

7 89 l 60 Ql 7 83 (77-24) l mg 60 EE CC$E CCMPCNENT CCCE su F?cIL R VCt.ATCN 017 l Hl Hl lEl lM lE lC lF lU lN l lAl l Wl 2 l9 l0 l lN l .

7 89 10 11 12 17 43 44 47 48 CAUSE DESCRIPTION

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@l Steam supoly valve opens sufficient 1v fast on remote s art to admit Main Steam faster l 7 89 60 hl than governor response. Overspeed trio. The EWP' was supolied by Auxiliarv Steam and l 7 89 80 docinvad neo*nhia u4ekin 7T kntirn_ l 6l FactrTV STATUS  % POWER OTHER STATUS METHCO OF CtSCCv!RY CGCOVERY CESCRPTCN 7-U 11 9

d l 0} 4l 0l l 10 12 13 N/A 44 l lB l 45 l N/A l- ]

46 60 E'.E ED 0 AE AMOUNT OF ACTMTY LOCATON OF AELEASE 12 lZ l ASE l N/A l l N/A l 7 8 9 10 11 44 45 PERSONNEL EXPOSURES 80 l NUMBER TYPE CESCRIPTON Q l0l0l0l 7 89 11 l Zl 12 l

13 N/A l

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Pi RSONNEL INJURIES NUMC!A CEECn:PTION h l0l0l0l11 12l 7 89 N/A l

e0 OFFSITE CONSEGUENCES mm l N/A- .

7 09 l t.:0 LOSS On DAf.* AGE TO TAC:UTY TYPE CE*CfhPTON .

7 1i UD Ul 10 N/A __l l LO t

PUBUCITY .

1 l N/A 7 0o l tu ADDITIONAL FACTORS

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See attached Supplementary Information 8 0 ()2 270 hfg l w j 7 00

~ l NAMC: W. P. Stewart W,' PHOnc. (813) 866-4159 l ea l

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SUPPLEMENTARY INFORMATION

1. Report No: 50-302/77-24 '

f 2. Facility: Crystal River Unit #3

3. Report Date: 29 March 1977 i

4. Occurrence Date: 7 March 1977

5. Identification of occurrence:

e Failure to have two Emergency Ndwater Pumps available and operable from two independent power sources as defined by Technical Specification 3.7.1.2.b.

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l 6. Conditions Prior to Occurrence: ,

l

! At steady state condition in Mode 1, 40% power, a start of 3B Turbine driven . :

Emergency Feedwater Pump was attempted to inspect for packing leakage.

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7. Description of Occurrence:

At 1720 on 7 March 1977, 3B Turbine driven Emergency Feedwater Pump was scatted from the Control Board with Main Steam as the supply. The pump cripped on overspeed and was declared inoperable per Technical Specifica- 1

tion 3.7.1.2.b. Further investigation revealed that the pump operated j normally when started locally on Main Steam. The steam source was changed -

to Auxiliary Steam and the pump operated normally both locally and from the l Control Board. With the lineup on Auxiliary Steam the pump was declared j operable. l l

4 8. Designation of Apparent Cause of Occurrence:

j On initial steam admission, Turbine throttle valve opens fully. Steata sup-  !

! ply valve opens sufficiently fast on remote start to admit Main Steam faster  !

than gcvernor can respond to throttle the flow. Turbine then trips on over-speed.

9. Analysis of Occurrence:

Redundancy is provided by motor driven Emergency Feedwater Pump which was de-termined available and operable. Turbine driven ENP is operable both lo-i cally and remotely when lined up on Auxiliary Steam. Should this supply '

i become unavailable, startup of the pump can be accomplished manually using Main Steam lineup within the time frame required by the Safety Analysis.

There were no adverse safety consequences resulting from this occurrence.

., 10. Corrective Action:

As a result of this occurrence, Auxiliary Steam lineup is maintained for standby EWP condition. Engineering has been requested to provide means to prevent remote, Main Steam startup problem.

, 11. Failure Data:

There have been no previous occurrences of this type.

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