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)

Text

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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 Routine- Shutdown Operation Other (specify)

7. Description of Occurrence

. 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 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.

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 l

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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:

None 4

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

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