ML20134F841
| ML20134F841 | |
| Person / Time | |
|---|---|
| Site: | Calvert Cliffs  |
| Issue date: | 02/03/1997 |
| From: | Katz P BALTIMORE GAS & ELECTRIC CO. |
| To: | Miller H NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I) |
| References | |
| NUDOCS 9702100179 | |
| Download: ML20134F841 (2) | |
Text
,
PETE3 E. KATz Baltimore Gas and Electric Company 3
Plant General Manager Calvert Cliffs Nuclear Power Plant J
Calven Cliffs Nuclear Power Plant 1650 Calven Cliffs Parkway Lusby, Maryland 20657 410 495-4101 i
1
)
)
February 3,1997 b
U. S. Nuclear Regulatory Commission l
I l
Region 1 475 Allendale Road l
King of Prussia, PA 19406 i
ATTENTION:
Mr. II. J. Miller, Regional Administrator l
SUBJECT:
Calvert Cliffs Nuclear Power Plant i
Unit No. 2; Docket No. 50-318 i
Inonerable Main Steam IIeader Radiation Monitor - Soecial Reoort i
The attached special report is submitted in accordance with Calvert Cliffs Unit 2 Technical Specification 3.3.3.1.
The report concerns the inoperability of Unit 2 No. 22 Main Steam lieader
]
Radiation Monitor for a period in excess of seven days.
j l
Should you have questions regarding this matter, we will be pleased to discuss them with you.
3 i
j Very truly yours, 1
)
for P. E. Katz
/
1 Plant General Manager f
I PEK/RCG/ dim
Attachment:
Unit 2 No. 22 Main Steam lleader Radiation Monitor Special Report cc:
D. A. Bnme, Esquire Document Control Desk, NRC l ['
J. E. Silberg, Esquire Resident Inspector, NRC Director, Project Directorate I-1, NRC R.1. McLean, DNR A. W. Dromerick, NRC J.11. Walter, PSC 9702100179 970203" PDR ADOCK 05000318 S
PDR i
j
i ATTACHMENT (1)
UNIT 2 NO. 22 MAIN STEAM HEADER RADIATION MONITOR SPECIAL REPORT l
We submit this Speciai Report concerning an inoperable Main Steam IIcader Radiation Monitor as
)
required by Technical Specification 3.3.3.1, Table 3.3-6, Item 2.b.ii.
]
ACTION TAKFN Number No. 22 Main Steam licader Radiation Monitor was removed from Operable status on January 10,1997 at approximately 1030 due to excessive failure alarms being received and remains inoperable.
A Special Report, dated January 17,1997, was previously submitted stating that No. 22 Main Steam lieader Radiation Monitor had experienced three independent failures each believed to be age-related.
The cause of one of the failures was identified and repaired. The causes of the two remaining failures have been isolated but the repairs are not yet completed. Troubleshooting completed to date has determined that an intermittent electrical contact exists within the cable to the ratemeter from the detector and that the ratemeter electronics appear to be degrading.
Calvert Cliffs previously initiated actions to replace the Unit 2 Nos. 21 and 22 Main Steam Radiation Monitor systems during the scheduled 1997 refueling outage.
EFFECT ON OPERATION Unit 2 Technical Specification 3.3.3.1 Action Statement (30) was entered when No. 22 Main Steam lieader Radiation monitor was removed from service. In accordance with this Action Statement and our Accidental Radioactivity Release Monitoring and Sampling Methods procedure (ERPIP-821), alternate sampling methods were implemented. The inoperability of No. 22 Main Steam IIcader Radiation Mo# tot did not affect Unit 2 operation.
C AUSES OF INOPERABILITY The causes of the inoperability are the intermittent electrical contact in the cable and degraded performance of the ratemeter, PLANS AND SCHEDULES FOR RESTORING THE SYSTEM TO OPERABLE STATUS Number No. 22 Main Steam IIeader Radiation Monitor was removed from Operable status on January 10,1996 at approximately 1030 and remains inoperable. Plans have been made to replace the degraded No. 22 Main Steam lieader Radiation Monitor ratemeter with a ratemeter removed from Unit I following the replacement of the Unit 1 Main Steam lleader Radiation Monitor systems. The replacement of the Unit i Main Steam 11eader Radiation Monitor systems is currently scheduled for the week of February 3,1997. A Unit I ratemeter is scheduled to be installed into the No. 22 Main Steam Radiation Monitor sys:em the week of February 10, 1997. The performance of the cable from the detector to the ratemeter will be re-evaluated at that time.
Numbers 21 and 22 Main Steam lleader Radiation Monitor systems will be replaced in their entirety during the scheduled 1997 refueling outage.
l 1
.