ML20043B664
| ML20043B664 | |
| Person / Time | |
|---|---|
| Site: | Sequoyah  |
| Issue date: | 05/29/1990 |
| From: | Wallace E TENNESSEE VALLEY AUTHORITY |
| To: | NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM) |
| References | |
| 90-09, 90-9, NUDOCS 9005310081 | |
| Download: ML20043B664 (2) | |
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TENNESSEE VALLEY AUTHORITY CHATTANOOG A. TENNESSEE 37401 SN 157B Lookout Place ~
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MAY 291990 U.S.' Nuclear Regulatory C eyission ATTN: -Document Control % c'.
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Hasnington, D.C.
20555
- Gentlemen:
In,the Matter of
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Docket Nos. 50-328 1
Tennessee Valley Authority
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~ SEQUOYAH NUCLEAR PLANT (SQN)'- TECHNICAL SPECIFICATION (TS) 3.3.3.7 - SPECIAL REPORT.90-09 The enclosed special report provides details concerning the Condenser Vacuum Exhaust Vent Mid-Range. Noble Gas Monitor 2-RM-90-405 being inoperable for
-greater than seven days.
This report is being submitted in accordance with TS' Action Statement (d) of Limiting Condition-for Operation 3.3.3.7.
If you have any questions concerning this submittal, please telephone M,
A.' Cooper at (615) 843-6651.
Very truly yours, TENNESSEE. VALLEY AUTHORITY
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n E. G. Hollace, M n&ger Nuclear' Licensing and Regulatory Affairs-Enclosure.
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cc-(Enclosure):
' Ms. S. C' Black, Assistant Director-for Projects 4
TVA Projects Division
. U.S.: Nuclear. Regulatory Commtssion 1
' One White Flint, North 11555 Rockville-Pike Rockville, Maryland 20852 NRC Resident Inspector j
Sequoyah Nuclear Plant 2600 Igou Ferry Road
. Soddy Daisy, Tennessee 37379 Mr.
B.' A. Wilson, Assistant Director for Inspection. Programs TVA Projects Division U.S. Nuclear. Regulatory Commission Region II 101-Marietta Street, NH, Suite 2900 Atlanta,: Georgia, g
30323 9005310081 900529 LPDR ADOCK 05000328
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PDC An Equal opportunity Employer 4
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ENCLOSURE
- QN SPECIAL REPORT 90 S This special report is being made in.accordance with Action Statement (d) of-Limiting Condition for Operation (LCO) 3.3.3.7.-
The mid-range noble gas-.
' radiation nonitor (RM) (2-RM-90-405) for.the' condenser vacuum exhaust-vent has
-been inoperable for greater than seven days.
On May 15,1990, at -1100 Eastern daylight time, with Unit i shut down. for a refueling outage and Unit 2 in Mode l'(100 percent power, 2,235 pounds per i
square inch gauge, and 578 degrees Fahrenhe t), LC0 3.3.3.7 was entered when a trouble alarm on Control Room Panel 2-M-30 was observed. An investigation into the-situation revealed that 2-RM-90-405 had apparently malfunctioned.
Work Request C003224 was initiated to inspect the RM and return it to service. Inspection of the monitor revealed a damaged and degraded detector cable. The cause of the cable being damaged was indeterminate.
When maintenance was1 scheduled to replace the cable, it was identified that a replacement' cable was.not available and that it will take approximately 14 days to procure a new cable.
Based on this delivery date, the projected-schedule for receipt and installation of the new cable is June 8, 1990.
- Until the RM can be returned to service, an alternate method of monitoring the appropriate parameters has been established.
The alternate method is accomplished by Operations closely monitoring the-condenser vacuum exhaust Postaccident Monitors'2-RM-90-255 and 2-RM-90-256. 'These~ monitor channels, which have overlapping ranges, monitor effluent radioactivity concentrations by~ detection of' exposure rates in the vicinity of the condenser vacuum pump exhaust duct.
These alternate monitors were originally the means of
-monitoring the condenser vacuum exhaust vent before the 2-RM-90-405 monitor was installed.
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