ML19319E454
| ML19319E454 | |
| Person / Time | |
|---|---|
| Site: | Arkansas Nuclear  |
| Issue date: | 01/30/1975 |
| From: | Phillips J, Woodward J ARKANSAS POWER & LIGHT CO. |
| To: | |
| Shared Package | |
| ML19319E445 | List: |
| References | |
| NUDOCS 8004100728 | |
| Download: ML19319E454 (3) | |
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Abnormal Occurrence Report No.
50-313/75-2 2.
Report Date:
1/30/75 3.
Occurrence Date:
1/23/75 4.
Facility:
Arkansas Nuclear One-Unit 1 Russellville, Arkansas 5.
Identification of Occurrence:
Primary Makeup Pump P36C drain line leak near the casing discharge nozzle.
6.
Conditions' Prior to Occurrence:
. Steady-State Power X
Reactor Power J530 MWth' Ilot Standby Net. Output 835 MWe Cold Shutdown Percent of Full Power 98.5%
Refueling Shutdown Routine Startup Operation r
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Routine Shutdown
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Operation Load Changes During Routine Power Operation Other (Specify) 7.
Description of Occurrence:
s-At approximately.15:30 hours, a leak was discovered on the Primary Makeup Pump P36C 1/2 inch casing drain line where the drain line is threaded into the casing discharge nozzle. The crack extended around approxi-mately 3/4 of the pipe circumference. The drain line was removed and a 7
threaded plug was temporarily installed until a new line could be fabri-cated and installed.
l P36A and B were inspected and no abnormalities were found.
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'O Abnormal Occurrence Report No.
50-313/75-2 Sheet 2 8.
Designation of Apparent Cause of Occurrence:
Design Procedure Manufacture Unusual Service Condition Including Installation /
X Environmental Construction Component Failure Operator Other (Specify)
X It is believed that this failure is due to improper fitup of the threaded section of the casing drain line. An investigation is in progress to determine if there are any other contributing causes.
9.
Analysis of Occurrence:
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The P36C outage was of a much shorter duration than that allowable as defined in Technical Specification 3.3.5.
There were no safety impli-cations or hazards to the public safety involved.
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- 10. Corrective Action:
A new casing drain line pipe section was fabricat'ed and installed. The proper fitup of the threaded portion was verified. A vibration analysis
,2 of the pipe section in question is being initiated to determine if there are any abnormal vibrations in the vicinity of the crack.
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July 5, 1974 NSP-21, Rev. O Page 2 of 3
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Abnormal Occurrence Report No.
50-313/75-2 Sheet 3 11.
Failure Data:
There have been no previous failures of this type. The Makeup Pump nameplate data is as follows:
Byron-Jackson, Horizontal Double Bearing Pump Type DVMX, Serial Number 691-N-0063.
12.
Reviews and Approvals:
Reviewed and Approved by: Plant Safety Committee Yes (X)
No ( )
P'lant Superintendent Yes (X)
No ( )
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Reference:
JWA-821 Date: 1/28/75 Reviewed by:
2m Date: / 30 d'
Licensing Supervisor
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Approved byhyGv/uf;
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Date: / 50 - 3 P Safety Review Committhe Approved by:
b Date: / 7 f g
ager of Nuclear Services Approved by
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Date b d C -R (
'l Director of Power Production Approved by:
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Date: / 7b
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Senior Vice fresident
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July 5, 1974 NSP-10, Rev, 0 Page 3 of 3
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