ML19305D198
| ML19305D198 | |
| Person / Time | |
|---|---|
| Site: | Summer  |
| Issue date: | 03/07/1980 |
| From: | Crews E SOUTH CAROLINA ELECTRIC & GAS CO. |
| To: | James O'Reilly NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II) |
| References | |
| REF-PT21-80-200-000 NUDOCS 8004140174 | |
| Download: ML19305D198 (3) | |
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ATTACED IS A PART 21 REPORT FROM IE f%IL UNIT - ROOM 359E/W PART21IDENTIFICATIONNO.
To-m -oo COMPANY NAEM W F o
DATEOFLETTER 3h /r d DOCET NO. to - 39 s-DATEDISTRIBUTED 3/n/ro ORIGINAL REPORTj SUPPLDENTARY Z DISTRIBUTION:
REACTOR (R)[
FUEL CYCE 8 [
SAFEGUARDS (S)]
f%)ERIALS(M)
NRR/ DOR, DIRECTOR AD/FFMSI-AD/SG-IE NRR/DPM DIRECTOR ffES/FCMS AD/ROI AD/RDI ( 2 )
REGICNS REGIONS AD/RCI IE FIES NRR/ DOR, DIRECTOR
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PEGIONS PDR NMSS/SG SS-881 IE FIES (2)
LPDR PDR CENTPAL FIES CBFPAL FIES-SS-396 LPDR CBiTRAL FIES (CHRON)
TEPA GAL FIES(CHRON)
GC)
IE FIES (2)
TEPA LPDR CENTRAL FIES 016 TEPA L0EB/fPA ONB5715 CENTPAL FIES (CHRON)
LCEB/ IPA tliB 5715 CENTPAL FIES - SS-396 ACTION:
L0EB/fPA FNB 5715 PRELIMINARY EVUAl.ATION OF THE ATTACHED REPORT INDICATES LEAD RESPONSIBILITY FdR FOLLOW-UP AS SH0hN BELOW:
LW La C um[
QME1 SG FFMSI l
REV. 2/26/80
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I SOUTH CAROLINA ELECTRIQ & GAS COMPANY rass erroce mon see COLUMBIA,SoufH CAnoLINA 292f 6 E.H. Ca tws, J m.
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March 7,.1980 hQ-0 0 '~ O O
Mr. James P. O'Reilly
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Office of Inspection and. Enforcement
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United States Nuclear Regulatory Commiss' ion Region II
, 101 Marietta Street, NW, Suite 3100 Atlanta, Georgia 30303
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Subject:
Virgil C.' Summer Nuclear Station
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Reportable Significant Deficiency
, Emergency Feedwater Pump, Turbine Covernor Valve Linkage Nuclear Engineering File - 3.1051
Dear Mr. O'Reilly:
On October 17, 1979 Mr. Jack Skolds of NRC Region II was notified of a potqptial significant deficiency.
Under the South Carolina Electric and Gas Company program this defect which was determined, on March 4 1980, to be a 2
substantial safety hazard as defined by 10CFR Part 21 is being reported as'a
'cignificant deficiency under 10CFR'50 55(e)
In our preliminary evaluation, consideration had been given to the fact that redundant motor driven emer-gency feedwater pumps would prohibit this failure from being a substantial safety hazard; however, following discussions with Region II on March 3, 1980 regarding the use of redundancy in evaluation of substantial safety hazards, SCE6G reevaluated the deficiency.
Mr. Jack Skolds of NRC Region II was no-tified on March 4, 1980 of this change in evaluation.
Details of the problem are discussed in the attachment to this letter.
eenf Since corr ective action has completed, this will be the final report on this item.
If any questions ise please let us know.
V ryltrily yours,
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. H. Crews, Jr.
EHC:Jw cc: Office of Inspection and Enforcement i
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ATTACHMENT 1.
Name of Reporting Individual Mr. Ronald B. Clary - P. O. Box 764 - Columbia, South Carolina 29218.
I 2.
Identification of Basic Component Emergency Feedwater Pump Drive Turbine, TPP-8-EF.
3.
Identification of Firm Supplying Component Terry Corporation, P. O. Box 555, Windsor, Connecticut 06095.
4.
Nature of Defect, Safety Hazard Created, Evaluation The component involved is the emergency feedwater pump turbine which l
was manufactured by Terry Corporation and supplied through Bingham l
Willamette.
The turbine is a type GS-2, horizontally split.casingi l
tangential flow turbine fitted with a Woodward type PC-PL governor and equipped with a horizontally mounted steam control valve, The defect reported involved the potential for the governor valve to close when it-~
should remain open while the turbine is on stand-by and being subjected to excessive vibration.
If the problem remained uncorrected it could be possible that during an
. accident the turbine driven emergency. feedwater pump would not be avail-e -.
able.
If there was a concurrent single active failure of one of the 50%
capacity motor driven pumps, this failure could possible affect the ability to conduct a safe shutdown.
5.
Date Information of Defect was Obtained Terry Corporation letter to NRC dated Noverber 6,1979 identifying de-feet as a 10CFR 21 item.
6.
Number and Location of Defects There is only one coergency feedwater pump drive turbine, TPP-8-EF, in the V. C. Summer Nuclear Station.
7.
Corrective Action The corrective action taken was to modify the governor linkage to
^i accommodate a spring which preloads the valve linkage so that the governor valve remains in the open position during stand-by.
The modification was completed during February,1980 utilizing a re-trofit kit and instructions supplied by Terry Corporation.
8.
Advice None.
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