ML19031A898

LER 1978-017-03 for Salem Unit 1 Tilt Ratio During Power Escalation

ML19031A898
Person / Time
Site:	Salem
Issue date:	04/05/1978
From:	Librizzi F Public Service Electric & Gas Co
To:	Grier B NRC/IE, NRC Region 1
References
LER 1978-017-03
Download: ML19031A898 (4)

Text

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Public Service Electric and Gas Company 80 Park Place Newark, N.J. 07101 Phone 201/622-7000 April 5, 1978

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Dear Mr. Grier:

LICENSE NO. DPR-70 DOCKET NO. 50-272 REPORTABLE OCCURRENCE 78-17/03L Pursuant to the requirements of Salem Generating Station Unit No. 1 Technical Specifications, Section 6.9.1.9.b, we are submitting Licensee Event Report for Reportable Occurrence 78-17/03L. This report is required within thirty (30) days of the occurrence.

Sincerely yours,

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F. P. Librizzi General Manager -

Electric Production CC: Director, Office of Inspection and Enforcement (30 copies)

_Director, Office of Management Information and Program Control The Ener~r,r People 95-2001 300M 10-7L

Report Number: a8-l 7/03L Report Date: 415/78 Occurrence Date: 3/7/78 Facility: Salem Generating Station Public Service Electric & Gas Company Hancock's Bridge, New Jersey 08038 IDENTIFICATION OF OCCURRENCE:

Quadrant Power Tilt Ratio Greater than 1.02 CONDITIONS PRIOR TO OCCURRENCE:

Operational Mode 1 Reactor Power: 58% increasing at 5%/Hr.

DESCRIPTION OF OCCURRENCE:

At 0450 hours0.00521 days <br />0.125 hours <br />7.440476e-4 weeks <br />1.71225e-4 months <br /> during a power escalation to 100%, Quadrant Power Tilt Ratio was determined to be 1.031. This being above the 1.02 allowed by Technical Specification 3.2.4 required the implementation of Action Statement "a". The power escalation rate was reduced from 5%

per hour to 3% per hour and the Quadrant Power Tilt Ratio returned to less than 1.02. At 0745 hours0.00862 days <br />0.207 hours <br />0.00123 weeks <br />2.834725e-4 months <br /> the action statement for LCO 3.2.4 was terminated.

DESIGNATION OF APPARENT CAUSE OF OCCURRENCE:

The cause of this occurrence was the power escalation rate of 5% per hour. When the escalation rate was reduced to 3% per hour, QPT ratio decreased to less than 1.02 within three hours.

ANALYSIS OF OCCURRENCE:

Technical Specification Action Statement for LCO 3.2.4 states that ...

With the Quadrant Power Tilt Ratio determined to exceed 1.02 but

< 1.09:

Within 2 hour2.314815e-5 days <br />5.555556e-4 hours <br />3.306878e-6 weeks <br />7.61e-7 months <br />s:

a) Either reduce the Quadrant Power Tilt Ratio to within its limit, or b) Reduce Thermal Power at least 3% from Rated Thermal Power for each 1% of indicated Quadrant Power Tilt Ratio in excess of 1.0 and similarly reduce the Power Range Neutron Flux-High Trip Setpoints within the next 4 hours4.62963e-5 days <br />0.00111 hours <br />6.613757e-6 weeks <br />1.522e-6 months <br />.

Verify that the Quadrant Power Tilt Ratio is within its limit within 24 hours2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br /> after exceeding the limit or reduce Thermal Power to less than 50% of Rated Thermal Power within the next 2 hours2.314815e-5 days <br />5.555556e-4 hours <br />3.306878e-6 weeks <br />7.61e-7 months <br /> and reduce the Power Range Neutron Flux-High Trip setpoints to < 55% of Rated Thermal Power within the next 4 hours4.62963e-5 days <br />0.00111 hours <br />6.613757e-6 weeks <br />1.522e-6 months <br />.

LER 78-17/03L .. fdentify and correct the cause of the out of limit condition prior to increasing Thermal Power; subsequent Power Operation above 50% of Rated Thermal power may proceed provided that the Quadrant Power Tilt Ratio is verified within its limit at least once per hour for 12 hours1.388889e-4 days <br />0.00333 hours <br />1.984127e-5 weeks <br />4.566e-6 months <br /> or until verified acceptable at 95% or greater Rated Thermal Power.

The Quadrant Power Tilt Ratio returned to within its limit within three hours therefore no further action was required. Thermal Power remained less than 90% during this period.

CORRECTIVE ACTION:

This occurrence is considered to be normal when increasing reactor power. It has been demonstrated that a rate of 5% per hour can produce a QPT ratio of greater than 1.02. When the rate was reduced to 3% per hour the QPT ratio decreased to less than 1.02. Power escalation continued at 3% per hour to 100% power and QPT ratio remained less than 1.02.

FAILURE DATA:

N/A

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Prepared by T. L. Spencer c/.

Manager -

SORC Meeting No. 14-78

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NRC .FORM 366 U.S. NUCLEAR REGULATURY COMMISSION

. '(7-77) ., ..* '*

LICENSEE EVENT REPORT

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[:III) !At 0450 hours during power escalation to 100% Quadrant Power tilt ratio C£:IIJ 1was determined to be 1.031. Action Statement "a" for LCO 3.2.4 was CQJ:IJ !implemented. At 0745 hours QPT was reduced to less than 1.02 and

[§))] !Action Statement "a" for LCO 3.2.4 was terminated.

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