ML18005A286
| ML18005A286 | |
| Person / Time | |
|---|---|
| Site: | Harris  |
| Issue date: | 02/05/1988 |
| From: | Watson R CAROLINA POWER & LIGHT CO. |
| To: | NRC OFFICE OF ADMINISTRATION & RESOURCES MANAGEMENT (ARM) |
| References | |
| HO-880021-(O), NUDOCS 8802120086 | |
| Download: ML18005A286 (4) | |
Text
I'CC FA REGUL INFORMATION DISTR IBUTI YSTEM (RIDS)
E SION NBR: 880 '120086 DGC. DATE: 88/02/05 NOTARIZED:
NO CIL: 50-400 SheaT on Harris Nuclear Power Plant.
Unit 1> Carolina AUTH. NAME AUTHOR AFFILIATION WATSON>,R. A.
CaT olina Power 5 Light Co.
RECIP. NAME RECIPIENT AFFILIATION Document Control Branch (Document Control Desk),
DOCKET 05000400
SUBJECT:
Special rept: on 880118> main steam line radiation monitor
'C'ailed to adequately respond to routine source check. Caused bg source sticking in par tiallg inserted position. Wor k request initiated to repair monitor.
DISTRIBUTION CODE:
IE22D COPIES RECEIVED: LTR ENCL SIZE:
TITLE:
- 50. 73 Licensee Event RepoT t (LER)> Incident Rpt>
etc.
NOTES: Application for permit renewal Filed.
05000400 REC IP IENT ID CODE/NAME PD"-1 LA BUCKLEY> B INTERNAL:
ACRS MICHELSON AEOD/DQA AEGD/DSP/RQ*B ARtd/DCTS/DAB NRR/DEST/ADS NRR/DEST/ELB NRR/DEST/MEB NRR/DEST/PSB NRR/DEST/SQB NRR/DLPG/GAB NRR/DREP/RAB NR D
SIB 02 ES/DE/E I B RQN2 FILE 01 EXTERNAL:
EQuQ GRGH> M H ST LOBBY WARD NRC PDR NSI C i lAYS. Q CGP IES LTTR ENCL 1
1 f
1 1
2 2
1 f
1 0
1 1
1 1
1 1
1 1
1 1
1 1
1 1
1 1
5 5
1 1
1 1
RECIPIENT ID CODE/NAME PD2-1 PD ACRS MQELLER
- EQD/DSP/NAS AEOD/DSP/TPAB DEDRO NRR/DEST/CEB NRR/DEST/ ICSB NRR/DEST/MTB NRR/DEST/RSB NRR/DLPG/HFB NRR/DOEA/EAB NRR/DREP/RPB NRR/PMAS/ ILRB RES TELFORD> J RES/DRPS DIR FORD BLDG HOY> A LPDR NSIC HARRIS J COPIES LTTR ENCL 1
2 2
f 1
1 1
1 1
1 1
1 1
1 1
1 1
1 1
2 2
'1 1
f 1
1 1
1 1
1 1
1 TOTAL NUMBER GF CGP IES REQUIRED.'TTR 46 ENCL 45
CARL Carolina Power & Light Company HARRIS NUCLEAR PROJECT P. 0.
Box 165 New Hill, North Carolina 27562 t co 5 SAR File Number'SHF/10-13510C Letter Number'HO"880021 (0)
United States Nuclear Regulatory Commission Attention:
Document Control Desk Washington, DC 20555 HARRIS NUCLEAR PROJECT UNIT 1 DOCKET NO. 50-400 LICENSE NO. NPF-63 NRC 14-DAY SPECIAL REPORT Gentlemen:
In accoidance with Technical Specifications 3.3.3.6 and 6.9.2 for the Shearon Harris Nuclear Power
- Plant, Unit No.
1, Carolina Power it Light Company hereby submits this Special Report.
This Special Report concerns operability of a radiation monitor.
Very truly yours, JRJ:dj Enclosure R. A. Watson Vice President Harris Nuclear Project cc'.
Dr. J.
N. Grace (NRC-RII)
Mr. B. Buckley (NRR)
Mr. G. Maxwell (NRC-SHNPP) 880212008b 880205 PDR ADOCK 05000400 8
PDR MEM/HO-8800210/1/Osl
MAIN STEAM LINE RADIATION MONITOR SPECIAL REPORT
~Back round:
The "C" Main Steam Line Radiation Monitor (RM-1MS-3593-SB) was declared inoperable under Technical Specification 3.3.3.6, Accident Monitoring Instrumentation, on January 18, 1988 at 1015.
This was due to intermittent failures of the check source test.
Efforts to return the monitor to operable status within 7
days have been unsuccessful due to the location of the monitor in the main steam
- tunnel, and the potential hazards to personnel when working in this area during power operations.
Therefore, this special report is submitted pursuant to Technical Specification 3.3.3.6, Action C.
On January 18,
- 1988, the "C" Main Steam Line Radiation Monitor failed to adequately respond to the routine source check.
The plant had been experiencing intermittent source check failures on this monitor earlier during the
- month, but subsequent source checks were performed satisfactorily.
. The monitor was declared inoperable at 1015 and a Work Request written to test and repair the monitor.
Because of the location of the monitor (attached to the Main Steam Line in the steam tunnel), it was not physically possible to get to the monitor to repair it during power operation without undue risk of personnel injury.
Therefore, a preplanned alternate method of monitoring the steam line was implemented.
The alternate monitoring method utilizes the Area Radiation Monitor (RM-1RR-3596),
which is installed inside the Main Steam Tunnel.
A Work Request has been initiated to test and repair the Main Steam Line Radiation Monitor during the next forced outage.
Cause.
Upon investigation of the
- problem, and after repeated actuations of the check source function, it was determined that the detector in the Main Steam Line Monitor appears to be functioning properly.
The cause of the intermittent failures of the source check appears to be due to the source sticking (upon withdrawal) in the partially inserted
- position, instead of withdrawing completely into the source housing.
This causes the detector to have a higher than normal background reading.
During the source
- test, the background reading is subtracted from the reading generated by the
- source, and this net reading must exceed 1000 counts per minute for the source check to be successful.
Due to the higher than normal background
- reading, caused by the sticking
- source, the difference between background and source readings is MEM/HO-8800210/2/Osl
not sufficient to satisfactorily pass the source check.
The
- reason for the sticking source is not known at this time since the monitor is not readily accessible during power operation.
Corrective Actions'.
The detector responds to radiation and should respond satisfactorily during an accident condition, although the response would be slightly higher due to the artificially elevated background due to the source sticking.
This slight over response would be in a
conservative direction.
- However, a
preplanned alternate method of monitoring has been implemented.
A Work Request has been initiated to repair the monitor during the next forced outage that allows access to the monitor.
MEM/H0-8800210/3/OS1