ML19320A150
| ML19320A150 | |
| Person / Time | |
|---|---|
| Site: | Arkansas Nuclear  |
| Issue date: | 04/08/1977 |
| From: | Mardis D ARKANSAS POWER & LIGHT CO. |
| To: | |
| Shared Package | |
| ML19320A146 | List: |
| References | |
| NUDOCS 8004140743 | |
| Download: ML19320A150 (4) | |
Text
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Reportable Occurrence Report No.
50-313/77-5A 2.
Report Date: 4-8-77 3.
Occurrence Date:
1-28-77 4
Facility:
Arkansas Nuclear One-Unit 1 Russellville, Arkansas 5.
Identification of Occurrence:
A leak on the pipe to flange weld between valve RBV-77B and "B" RCP seal.
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Conditions Prior to Occurrence:
Steady-State Power Reactor Power 0
MWth Hot Standby Net Output 0
gwe Cold Shutdown Percent of Full Power 0
Refueling Shutdown Load Changes During Routine Power Operation Routine Startup Operation Routine Shutdown Operation Other (specify)
Hot Shutdown 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, a pinhole leak was observed on the pipe-to-flange weld between Valve RBV-77B and "B" RCP seal. Valve RBV-77B servas as a means of 6nting the "B" RCP seal during initial fill of the RCS.
The leak could not be isolated.
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Reportable Occurrence Report No.
50-313/77-5A 8.
Designation of Apparent Cause of Occurrence:
Design Procedure Manufacture Unusual Service Condition Including Environmental Installation /
Construction Conn onent Failure (See Failure Data)
Operator Other (specify),
X Unknown 9.
Analysis of Occurrence:
The Reactor Coolant System leakrate prior to snutdown was approximately O.S GPM. Since the leakage was contained in a controlled area, there was no hazard to the health and safety of the public.
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1 Reportable Occurrence Report No. 50-313/77-5A r
10.
Corrective Action:
The defective weld was repaired during the recent refueling outage by grinding and rewelding.
11.
Failure Data:
l This is the second failure in this area. See Abnormal Occurrence I
Report 74-14.
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