ML18022A754
| ML18022A754 | |
| Person / Time | |
|---|---|
| Site: | Harris  |
| Issue date: | 01/15/1990 |
| From: | Richey R CAROLINA POWER & LIGHT CO. |
| To: | NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM) |
| References | |
| HO-900010-(O), NUDOCS 9001230200 | |
| Download: ML18022A754 (3) | |
Text
ACCELERATED DISTRIBUTION DEMONS TION SYSTEM REGULATORY INFORMATION DISTRIBUTION SYSTEM (RIDS)
ACCESSION NBR: 9001230200 DOC. DATE: 90/01/15 NOTARIZED-NO
'ACIL:50-400 Shearon Harris Nuclear Power Plant, Unit 1, Carolina AUTH.NAME AUTHOR AFFILIATION RICHEY,R.B.
Carolina Power
& Light Co.
RECIP.NAME RECIPIENT AFFILIATION Document Control Branch (Document Control Desk)
SUBJECT:
Special rept: on 891223,reactor coolant subcooling monitor declared inoperable due.to erratic indications.
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.
DOCKET 05000400 D
S 05000400
/
RECIPIENT ID CODE/NAME PD2-1 LA BECKER, D COPIES RECIPIENT LTTR ENCL ID CODE/NAME 1
1 PD2-1 PD 1
1 COPIES LTTR ENCL 1
1 A
D INTERNAL: ACRS MICHELSON ACRS WYLIE AEOD/DSP/TPAB DEDRO NRR/DET/EMEB9H3 NRR/DLPQ/LHFB11 NRR/DOEA/OEAB11 NRR/DST/SELB 8D NRR/DST/SPLB8D1 NUDOCS-ABSTRACT RES/DSIR/EIB EXTERNAL: EG&G WILLIAMS,S LPDR NSIC MAYS,G NUDOCS FULL TXT 1
1 1
1 1
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ACRS MOELLER 1
AEOD/DOA 1
AEOD/ROAB/DSP 1
NRR/DET/ECMB 9H 1
NRR/DET/ESGB 8D 1
NRR/DLPQ/LPEB10 1
NRR/DREP/PRPB11 1
NRR/DST/SICB 7E 1
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D R
D NOTE TO ALL"RIDS" RECIPIENTS:
PLEASE HELP US TO REDUCE WASTE! CONTACTTHE DOCUMENTCONSOL DESK, ROOM Pl-37 (EXT. 20079) TO ELIMINATEYOUR NAMEFROM DISTRIBUTION LISTS FOR DOCUMENTS YOU DON'T NEED!
TOTAL NUMBER OF COPIES REQUIRED:
LTTR 38 ENCL 38 A
D D
S
Carolina Power S Ught Company P. O. Box 165 ~ New Hill, N. C. 27562 R. B. RCHSY Manager Harrla Nuclear Prnject gQi g rJ 1990 Letter Number:
HO-900010 (0)
United States Nuclear Regulatory Commission ATTN:
Document Control Desk Washington, DC 20555 HARRIS NUCLEAR PROJECT 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 6.9.2 for the Shearon Harris Nuclear Power
- Plant, Unit No.
1, Carolina Power
& Light hereby submits this Special Report.
This Special Report concerns the operability of the Reactor Coolant Subcooling Monitor.
Very truly yours, p s'~
R. B. Richey, Manager Harris Nuclear Project RBR:dgr'nclosure cc:
Mr. R. A. Becker (NRR)
Mr. S.
D. Ebneter (NRC RII)
Mr. J.
E. Tedrow (NRC - SHNPP) 9001230200 900ii5 PDR ADOCK 05000400 PDC
<v'EM/H0-,9000100/1/Osl
REACTOR COOLANT SUBCOOLING MONITOR SPECIAL REPORT Descri tion of Event:
On December 23, 1989 at
- 0002, the Reactor Coolant Subcooling Monitor was declared inoperable due to erratic indications.
This monitor is identified in the Shearon Harris Technical Specifications, Table 3.3-10, Item 11.
The compensatory actions allow implementation of the alternative monitoring method, which is a
manual calculation of RCS subcooling
- margin, to permit continued operation of the plant.
This compensatory action was in place while the monitor was inoperable.
The monitor was out of service beyond the seven day limit, requiring a special report per Specification 6.9.2.
Cause/Corrective Actions:
The RCS Subcooling Monitor is a subroutine program of the main plant computer in the Safety Parameter Display System.
The plant computer receives inputs from the "A" and "B" safety trains of incore thermocouples via an isolation
- device, a
data isolator board.
The computer program then calculates a subcooling margin value base on train "A" and "B" data, providing a single output to the SPDS display.
The data isolator board for the "B" safety train had failed due to normal end of life cause.
The failure resulted in erratic high values of several incore thermocouples for the "B" train, causing the plant computer to improperly calculate the subcooling margin value.
The failed board was replaced on January 3,
- 1990,
~ restoring the monitor to operable status.
The repair was delayed due to the plant being in a refueling outage recovery and
- startup, and due to the holiday season' impact on personnel availability.
- Normally, equipment inoperabilities which are reportable after a specified time are identified and tracked at daily coordination meetings.
This inoperability was not identified,
- however, until the seven day period had elapsed.
The involved departments have been made aware of this situation, which is the first to have occurred in over three years of operation.
MEM/HO-9000100/2/Osl