ML19308D146

RO-77-62:on 770630,eight Hr Time Limit for Reduction to Less than 60% Thermal Power Exceeded.Caused by Personnel Error. Personnel Instructed to Heed Time Limits More Conservatively

ML19308D146
Person / Time
Site:	Crystal River
Issue date:	07/07/1977
From:	Stewart W FLORIDA POWER CORP.
To:
Shared Package
ML19308D108	List: ML19308D107 ML19308D146
References
NUDOCS 8002270624
Download: ML19308D146 (2)

Text

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!a l s 101-101310l21 l 016 l 31017 I 71 [ 0 l 710 ! 7 I 717 61 G8 09 74 73 ti EVENT O!:SCTcI'llON l3t-) l In Modo 1, reducing power to less than 607, thermal power, as required by Technical f uu il

@l Specification Action Statement 3.1.3.3.A.1, the 8 hour9.259259e-5 days <br />0.00222 hours <br />1.322751e-5 weeks <br />3.044e-6 months <br /> time limit was exceeded by 7 il 9 -

Eh hl one hour and seven minute s. Redundancy NA. First time occurrence. Personnel were 7 nu er

$l instructed to take necessary steps to insure that required time limits are met. '

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CAUSE DESCIUPilON * *8

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bl The event was the result of operator failure to stare power reduction in time to j hl satisfy the allowed time frame as set forth by Technical Specifications.

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/ 0u 11 12 l 00 OFFSITE CONSEQUENCES E@ l NA

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ADOll!ONAL i ACTORS  ?

See attached Sup21 cnentary In formation *

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SUPPLEMEffrARY INFORMATION J

1. Report No.: 50-302/77-62

2. Facility: Crystal River Unit #3

3. Report Date: 7 July 1977

4. Occurrence Date: 30 June 1977 -

5. Identification of Occurrence:

Exceeded the 8 hour9.259259e-5 days <br />0.00222 hours <br />1.322751e-5 weeks <br />3.044e-6 months <br /> time limit for reduction to less than / % thermal power as required by Technical Specification Action Statement 3.1.3.3. A.1.

6. Conditions Prior to Occurrence: ,-

Verifying the position of Rod 3, Group 6 as required by Technical Specification f-3.1.3.3, upon loss of the absolute position indication.

7. Description of Occurrence:

As a result of loss of absolute position indication of Control Rod 3, Group 6, power reduction to less than 60% thermal power was required to be achieved within 8 hours9.259259e-5 days <br />0.00222 hours <br />1.322751e-5 weeks <br />3.044e-6 months <br /> by Technical Specification Action Statement 3.1.3.3.A.1. Be-cause of several minor difficulties af ter the initiation of power reduction, the 8 hour9.259259e-5 days <br />0.00222 hours <br />1.322751e-5 weeks <br />3.044e-6 months <br /> time limit was exceeded by I hour and 7 minutes. At that time (0600),

the Action Statement was met except for the time interval. Conditions surround-ing absolute position indication failure will be reported as a 30 day written report prior to 30 July 1977.

8. Designation of Apparent Cause:

This event was a result of operator failure to anticipate the potential for equipment problems which retarded power reduction to less than 60% in the re-quired time frame.

9. Analysis of Occurrence:

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There was no safety related significance to this event.

10. Corrective Action:

Operations personnel were instructed to heed Technical Specification requirements as to time frame limits more conservatively and take necessary steps to insure these time limits are met. , ,

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11. Failure D'aca:

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) This event was non-repetitive.

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