ML19276F156

Non-Routine Rept 50-313/79-01:on 790216,max Differential Temp Across Condenser Exceeded Tech Specs Limit.Caused by Excessive Fish Impingement on Water Intake Screen.Isolation Valves Being Cycled to Wash Off Debris

ML19276F156
Person / Time
Site:	Arkansas Nuclear
Issue date:	03/16/1979
From:	ARKANSAS POWER & LIGHT CO.
To:
Shared Package
ML19276F151	List: ML19276F150 ML19276F156
References
NUDOCS 7903270417
Download: ML19276F156 (2)

Text

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1. Non-Routine Report No. 50-313/79-1

2. Report Date: 3/16/79 3. Occurrence Date: 2/16/79

4. Facility: Arkansas Nuc1 car One - Unit One Russellville, Arkansas 72801

5. Identification of Occurrence:

The failure to maintain the maximum differential temperature across the condenser below 15*F as required by Appendix B of the Technical Specifications. This Non-Routine Occurrence is reportable per Appendix B, T.S. 5.6.2(b).

6. Conditions Prior to Occurrence:

X Reactor Power 2560 MWth Steady-State Power Net Output 810 MWe flot Standby Cold Shutdown Percent of Full Power 100%

Refueling Shutdown Load Changes During I Routine Power Operation Routine Startup Operation Routine Shutdown Operation other (specify)

7. Description of Occurrence:

The unit was in steady state operation with four circulating water pumps in operation. On 2/16/79, the temperature differential across the condenser 2exceeded the 15*F limit required by Appendix B, T.S. .1.1 (a ) ,

for approximately 2-1/2 hours with a maximum rise of 15.26*F. Following the occurrence, during a review of the computer logs containing the condenser AT values, it was discovered that the Technical Specification limit was also exceeded for approximately 49 hours5.671296e-4 days <br />0.0136 hours <br />8.101852e-5 weeks <br />1.86445e-5 months <br /> on 2/9/79 through 2/11/79, with a maximum temperature rise of 15.45*F.

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