ML19320A155

RO 50-313/77-5:on 770128,at Hot Shutdown Conditions During Routine walk-through Investigation,Pinhole Leak Discovered on Upstream pipe-to-valve Weld of Valve RBW-77B.Cause Unknown.Repair of Weld Scheduled for Refueling Outage

ML19320A155
Person / Time
Site:	Arkansas Nuclear
Issue date:	03/07/1977
From:	Mardis D ARKANSAS POWER & LIGHT CO.
To:
Shared Package
ML19320A146	List: ML19320A145 ML19320A150 ML19320A152 ML19320A155
References
NUDOCS 8004140748
Download: ML19320A155 (4)

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.v/ 1. Reportable Occurrence Report No. 50-313/77-S

2. Report Date: 3/7/77 3. Occurrence Date: 1/28/77

4. Facility: Arkansas Nuclear One-Unit 1 Russellville, Arkansas S. Identification of Occurrence.- A pinhole leak on the upstream pipe-to-valve weld of Valve RBV-77B. This valve serves as a means of venting the "B" Reactor Coolant Pump seals during initial fill of the RCS.

6. Conditions Prior to Occurrence:

Steady-State Power ____ Reactor Power 0 MWth Hot Standby '

Net Output 0 MWe Cold Shutdown Percent of Full Power 0  %

Refueling Shutdown Load Changes During Routine Power Operation Routine Startup

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Operation Routine Shutdown Operation Other (specify) Hot Shutdown l

7. Description of Occurrence:

At approximately 0200 hours0.00231 days <br />0.0556 hours <br />3.306878e-4 weeks <br />7.61e-5 months <br /> on January 28, 1977, during a routine walk-through inspection by Operations Personnel prior to cooldown for refueling, a pinhole leak was observed on the upstream pipe-to-valve weld of Valve RBV-77B. ,

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Peportable Occurrence Report No. 50-313/77-5

8. Designation of Apparent Cause of Occurrence:

Deign Procedure Manufacture Unusual Service Condition Including Environmental Installation /

Construction Component Failure (See Failure Data)

, Operator Other (specify): Unknown

9. Analysis of Occurrence:

Since the Reactor Coolant System leak rate prior to shutdown was only approximately 0.5 GPM, there was no hazard t. the health and safety of the public.

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I Reportable Occurrence Report No. 50-313/77-5 i

10. Corrective Action: i I

Re repair of the weld is scheduled during the current refueling outage.

A followup report will be submitted after the repair is completed.

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i i 11. Failure Data: l

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D is is the second failure in this area. See Abnormal Occurrence Report 74-14.

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