ML18010B129
| ML18010B129 | |
| Person / Time | |
|---|---|
| Site: | Harris  |
| Issue date: | 07/12/1993 |
| From: | Robinson W CAROLINA POWER & LIGHT CO. |
| To: | NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM) |
| References | |
| HO-930121, NUDOCS 9307220006 | |
| Download: ML18010B129 (3) | |
Text
A.CCELERATFD DOCUMENT DISTR BUTION SYSTEM REGULAT INFORMATION DISTRIBUTIO STEM (RIDS)
ACCESSION NBR:9307220006 DOC.DATE: 93/07/12 NOTARIZED:
NO DOCKET FACIL:50-400 Shearon Harris Nuclear Power Plant, Unit 1, Carolina 05000400 AUTH.NAME 'UTHOR AFFILIATION ROBINSON,W.R.
Carolina Power 6 Light Co.
RECIP.NAME RECIPIENT, AFFILIATION Document Control Branch (Document Control Desk)
SUBJECT:
Special rept:on 930621,violation of TS 3.3.3.6 occurred due to time required to install new operating system.for inoperable RCS subcooling margin monitor a pressurizer safety valve position indication sys.
DISTRIBUTION CODE:
IE22D COPIES RECEIVED:LTR ENCL SIZE:
TITLE: 50.73/50.9 Licensee Event Report (LER), Incident Rpt, etc.
NOTES:Application. for permit renewal, filed.
05000400 RECIPIENT ID CODE/NAME PD2-1 LA LE,N INTERNAL: ACNW AEOD/DOA AEOD/ROAB/DSP NRR/DE/EMEB NRR/DRCH/HHFB NRR/DRCH/HOLB NRR/DRSS/PRPB NRR/DSSA/SRXB RES/DSIR/EIB EXTERNAL: EG&G BRYCE,J.H NRC PDR NSIC POOREiW.
COPIES LTTR ENCL 1
1 1
1 RECIPIENT ID CODE/NAME PD2-1 PD ACRS AEOD/DSP/TPAB NRR/DE/EELB NRR/DORS/OEAB NRR/DRCH/HICB NRR/DRIL/RPEB NR~RDSSAQSPLB E~~
02 L ST LOBBY WARD NSIC MURPHY,G.A NUDOCS FULL TXT COPIES LTTR ENCL 1
1 2
2 1
1 1
1 1
1 1
1 1
1 1
1 1
1 1
1 1
1 1
1 1
1 NOTE TO ALL"RIDS" RECIPIENTS:
PLEASE HELP US TO REDUCE iVASTE! CONTACT THE DOCUMENT CONTROL DESK, ROOM Pl-37 (EXT. 504-2065) TO ELIMINATEYOUR NAME FROM DISTRIBUTION LISTS FOR DOCUMENTS YOU DON'T NEED!
TOTAL NUMBER OF COPIES REQUIRED:
LTTR 32 ENCL 32
Carolina Power 8 Light Company ll HARRIS NUCLEAR PLANT P.O.
Box 165 New Hill, North Carolina 27562 FOUL 1
2 1993 Letter Number:
HO-930121 United States Nuclear Regulatory Commission ATTN:
Document Control Desk Washington, D AC.
20555 SHEARON HARRIS NUCLEAR POWER PLANT UNIT 1 DOCKET No.
50-400 LICENSE No. NPF-63 NRC 14-DAY SPECIAL REPORT In accordance with Technical Specifications 3.3.3.6 and 6.9 '
for the Shearon Harris Nuclear Power Plant, Unit No. 1, Carolina Power and Light hereby submits this Special Report.
This Special Report documents why the plant process computer was out of service and the steps taken to return it to service.
This computer contains the Pressurizer Safety Valve Position Indication and Reactor Coolant System Subcooling Margin Monitor functions required by Technical Specifications.
Very truly yours, W. R. Robinson General Manager Harris Nuclear Plant MV:cmg Enclosure cc: Mr. S.
D. Ebneter (NRC - RII)
Mr. N. B. Le (NRR -
PM)
Mr. J.
E. Tedrow (NRC SHNPP)
'I 9$ '4x MEM/HO-930121/1/OS1 poo ADOCK o>ooo"oo OPg 930712 I
gP
Descri tion of Event:
.On June 21, 1993, the Reactor Coolant System (RCS) Subcooling Margin Monitor and the Pressurizer Safety Valve Position Indication System were-declared inoperable.
This function is automatically performed by the plant process computer (Emergency Response Facility Information System
- ERFIS).
,For the reasons described below, these systems were not restored until July 2,
1993 and are therefore being reported in accordance with the requirements of Technical Specification 3.3.3.6.c and 6.9.2 as a period of inoperability greater than seven days.
'Technical Specification compensatory
- measures, consisting of manual RCS subcooling calculations and continuous monitoring of the safety valve piping temperatures were performed as required through the entire period.
Cause Corrective Action:
ERFIS was removed from servic'e on June 21,
- 1993, to perform an.upgrade to the computer operating system.
The upgrade installed the newest version of operating software to compliment a hardware upgrade which was'reviously installed.
The time required to install the new operating system and pe'rform the required acceptance testing exceeded the seven days allowed by T.S. 3.3.3.6.
Testing was completed on July 2,
- 1993, and ERFIS was returned to service.
These upgrades were made to improve the reliability of the plant process
- computer, thereby improving the reliability of the RCS Subcooling Margin Monitor and Pressurizer Safety Valve Position Indication.
MEM/HO-930121/2/OS1