ML19319E554

RO 50-313/77-01:on 770110,four Frozen Sensing Lines & Actuated Pressure Switch PS2668B in Red Channel Discovered When Slbic Alarm Sounded in Control Room.Caused by Subfreezing Temps.Slbic Removed from Svc While Lines Thawed

ML19319E554
Person / Time
Site:	Arkansas Nuclear
Issue date:	02/02/1977
From:	Mardis D ARKANSAS POWER & LIGHT CO.
To:
Shared Package
ML19319E550	List: ML19319E549 ML19319E554
References
NUDOCS 8004110813
Download: ML19319E554 (4)

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

2. Report Date: 2/2/77 3. Occurrence Date: 1/10/77

4. Facility:

Arkansas Nuclear One-Unit 1 Russellville, Arkansas

5. Identification of Occurrence:

Frozen sensing lines to SLBIC system

6. Conditions Prior to Occurrence:

Steady-State Power y Reactor Power 2362 MWth Hot Standby Net Output 760 MWe Cold Shutdown Percent of Full Power 92 %

Refueling Shutdown Load Changes During Routine Power Operation __ -

Operation

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Routine- Shutdown Operation

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Other (specify)

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7. Description of Occurrence

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. At approximately 2200 hours0.0255 days <br />0.611 hours <br />0.00364 weeks <br />8.371e-4 months <br /> on January 10, 1977 a trouble SLBIC alarm was indicated in the control room. An investigation revealed all four sensings lines were frozen and Pressure Switch PS2668B in

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the Red Channel had actuated. At 2330 hours0.027 days <br />0.647 hours <br />0.00385 weeks <br />8.86565e-4 months <br /> on January 10, 1977, .

SLBIC was defeated in order to thaw out the sensing lines.

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NSP-III-2, Rev. S Attachment "D" S ,

October 1, 1976 Page 2 of 4 l

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Reportable Occurrence Report No. 50-313/77-1 4

8. Designation of Apparent Cause of Occurrence:

Design Procedure Manufacture Unusual Service Condition

• X Including Environmental Installation /

Construction Component Failure (See Failure Data) 5 Operator Other (specify)

• Frozen lines due to subfreezing temperatures

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9. Analysis of Occurrence:

Since SLBIC can be removed from service for 24 hours2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br /> per Technical Specification 3.4.3 and SLBIC was restored at 1730 hours0.02 days <br />0.481 hours <br />0.00286 weeks <br />6.58265e-4 months <br /> on 1/11/77, there was no hazard to the health e.nd safety of the public.

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V October 1, 1976 NSP-III-2, Rev. 5 Attachment "D" 5 Page 3 Of 4

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Reportable Occurrence Report No. 50-313/77-1 4

i 10. Corrective Action:

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, After SLBIC was taken out of service the sensing lines were thawed. The insulation was then removed, heat tracing was applied to the lines, and the insulation was replaced.

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11. Failure Data:

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None

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October 1, 1976 NSP-III-2, Rev. 5 Attachment "D" 5 Page 4 of 4 1

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