ML19319E454

AO-50-313/75-2:on 750123,leak Found on Primary Makeup Pump P36C 1/2 Inch Casing Drain Line Near Casing Discharge Nozzle.Caused by Improper Fitup of Threaded Section of Casing Drain Line.Other Possible Causes Being Investigated

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: ML19319E444 ML19319E454
References
NUDOCS 8004100728
Download: ML19319E454 (3)

Text

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1. 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

( 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:

The P36C outage was of a much shorter duration than that allowable as C,,') 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 havedata nameplate beenisno asprevious follows: failures of this type. The Makeup Pump 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; -f fe '. /*

Safety Review Committhe Date: / 50 - 3 P Approved by: b Date: / 7 f g ager of Nuclear Services Approved by ##Zr [e 6/

' Date b d C -R ( 'l Director of Power Production

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Approved by: /

1. Date: / 7b ,

Senior Vice fresident

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July 5, 1974 NSP-10, Rev, 0 .

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