ML19031B168

LER 1978-016-03 for Salem Unit 1 Excessive Tilt Ratio of Quadrant Power

ML19031B168
Person / Time
Site:	Salem
Issue date:	03/23/1978
From:	Librizzi F Public Service Electric & Gas Co
To:	Grier B NRC/IE, NRC Region 1
References
LER 1978-016-03
Download: ML19031B168 (4)

Text

• • 0 PS~G Public Service Electric and Gas Company 80 Park Place Newark, N.J. 07101 Phone 201 /622-7000 March 23, 1978

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Dear Mr. Grier:

LICENSE NO. DPR-70 DOCKET NO. 50-272 REPORTABLE OCCURRENCE 78-16/03L 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 78-16/03L. This report is required within thirty (30) days of the occurrence.

Sincerely yours, Original Signed f_. P. Librizzi F. P. Librizzi General Manager -

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

Director, Office of Management Information and Program Control 7809500:35 The Energy People 95*2001 300M 1C* 0

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_-,- Report Number:

Report Date:

Occurrence Date:

Facility:

78-16/03L J/23/78 2/23/78 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 decreased from 100% to 70%

DESCRIPTION OF OCCURRENCE:

At 1315 hours0.0152 days <br />0.365 hours <br />0.00217 weeks <br />5.003575e-4 months <br /> following a .30% load reduction the Power Range Channel 1 deviation alarm was received in the Control Room. Quadrant Power Tilt Ratio was determined to be 1.027 on N-41 upper. Technical Specification 3.2.4 Action Statement a.2 was implemented. At 1345 hours0.0156 days <br />0.374 hours <br />0.00222 weeks <br />5.117725e-4 months <br /> Action Statement for LCO 3.2.4 was terminated with QPT calculation less than 1.02. QPT calculations continued for 12 hours1.388889e-4 days <br />0.00333 hours <br />1.984127e-5 weeks <br />4.566e-6 months <br />. All calculations were less than 1.02.

DESIGNATION OF APPARENT CAUSE OF OCCURRENCE:

The cause of this occurrence was the load reduction which resulted in flux oscillations resulting in the Quadrant Power Tilt Ratio exceeding 1.02.

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 78-16/03L ~ Identify 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 was reduced to within its limits within thirty minutes therefore no further action was required.

CORRECTIVE ACTION:

This occurrence is considered to be normal following a large load change. No long term corrective action is planned.

FAILURE DATA:

N/A Prepared by T. L. Spencer Manage~ - Salem Generating Station SORC Meeting No.* 14-78

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LICENSEE EVENT REPO.

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!At 1315 hours0.0152 days <br />0.365 hours <br />0.00217 weeks <br />5.003575e-4 months <br /> following a 30% loop reduction quadrant power t i l t ratio

[TIIJ I was determined to be 1. 027. Action Statements for LCD 3. 2. 4 implemented.!

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.u:::m ]This occurrence was the result of a 30% load reduction which resulted CIIIJ !in QPT ratio exceeding 1. 02. This is an exvected occurrence and no o:JJJ 1corrective action is planned.

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STATUS '4 POWER OTHER STATUS DISCOVERY DISCOVERY OESCRIPTlON ~

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