05000272/LER-1982-073, Forwards LER 82-073/03L-0.Detailed Event Analysis Encl

Forwards LER 82-073/03L-0.Detailed Event Analysis Encl

ML20063N852
Person / Time
Site:	Salem
Issue date:	09/22/1982
From:	Midura H Public Service Enterprise Group
To:	Haynes R NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I)
Shared Package
ML20063N853	List: 05000272/LER-1982-073, Forwards LER 82-073/03L-0.Detailed Event Analysis Encl 05000272/LER-1982-073-03, /03L-0:on 820906,calculation Showed That Quadrant Power Tilt Ratio for Bottom Detector N42 Exceeded Max Allowable Limit.Caused by Failed Milliamp Detector Switch in Current Meter Assembly.Assembly Replaced & Channel Tested
References
NUDOCS 8210070305
Download: ML20063N852 (3)

LER-1982-073, Forwards LER 82-073/03L-0.Detailed Event Analysis Encl

Event date:
Report date:
2721982073R00 - NRC Website

text

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Public Service Electric and Gas Company P.O. Box E. Hancocks Bridge, New Jersey 06038 Salem Generating Station September 22, 1982 7""~% ~..., _

j Mr. R. C. Haynes Regional Administrator USNRC Region 1 631 Park Avenue King of Prussia, Pennsylvania 19406

Dear Mr. Haynes:

LICENSE NO. DPR-70 DOCKET NO. 50-272 REPORTABLE OCCURRENCE 82-073/03L 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 82-073/03L.

This report is required within thirty (30) days of the occurrence.

Sincerely yours, lf.

Y H. J.

Midura General Manager -

Salem Operations RF:ksfd[

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Distribution I

0070305 820922 PP ADOCK 05000272

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PDR.

The Energy People p#

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sReport Number:

82-073/03L

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g Report Date:

09-22-82 E.

Occurrence Date:

09-06-82 L

h Facility:

Salem Generating Station, Unit 1 Public Service Electric & Gas Company g

Hancocks Bridge, New Jersey 08038 b

w IDENTIFICATION OF OCCURRENCE:

E

[

Quadrant Power Tilt Ratio - Out-of-Epecification.

This report was initiated by Incident Report 82-254.

7 CONDITIONS PRIOR TO OCCURRENCE:

e I

Mode 1 - Rx Power 100% - Unit Load 1110 MWe.

I DESCRIPTION OF OCCURRENCE:

?

At 0230 hours0.00266 days <br />0.0639 hours <br />3.80291e-4 weeks <br />8.7515e-5 months <br />, September 6, 1982, calculation showed the Quadrant Power Tilt Ratio (QPTR) for No. N42 Bottom Detector I

was greater than the maximum of 1.02 allowed by the Technical c

Specifications.

Since the value was within the range of 1.02

[

to 1.09, Technical Specification Action Statement 3.2.4.a was entered.

Investigation into the cause of the excessive QPTR revealed that a problem existed in No. N42 Detector B drawer.

A current measurement was taken directly from the detector, i-and the OPTR was determined to be within specification.

Action Statement 3.2.4 was accordingly terminated at 0425 hours0.00492 days <br />0.118 hours <br />7.027116e-4 weeks <br />1.617125e-4 months <br />, September 6, 1982.

DESIGNATION OF APPARENT CAUSE OF OCCURRENCE:

Further investigation of the problem revealed that the milli-amp detector switch in the detector current meter assembly had failed.

The failure resulted in improper detector current E

measurements and an erroneous QPTR value.

No previous failures of the switch had been noted, and the occurrence was assumed to k

be of an isolated nature.

ANALYSIS OF OCCURRENCE:

The limit on QPTR provides DNB and linear heat generation rate 7

protection with X-Y plane power tilts.

Action Statement 3.2.4.a i

requires:

With the QPTR determined to exceed 1.02 but less than or equal to 1.09, within 2 hours2.314815e-5 days <br />5.555556e-4 hours <br />3.306878e-6 weeks <br />7.61e-7 months <br /> either reduce the QPTR to within its limit, or reduce thermal power at least 3% from rated thermal power for each 1% of indicated QPTR 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 />.

M

7 LER 82-073/03L "

, ANALYSIS OF OCCURRENCE:The 2 hour2.314815e-5 days <br />5.555556e-4 hours <br />3.306878e-6 weeks <br />7.61e-7 months <br /> time allowance for operation with QPTR between 1.02 and 1.09 is provided to allow identification and correction of a dropped or misaligned rod.

)

As noted, the QPTR was actually within specification.

The occurrence, therefore, did not involve any risk to the health or safety of the public.

The incident constituted operation in a degraded mode permitted by a limiting condition for operation, and is reportable in accordance with Technical Specification 6.9.1.9.b.

CORRECTIVE ACTION

As stated, the QPTR was determined to be within specification, and the action statement was terminated within the 2 hour2.314815e-5 days <br />5.555556e-4 hours <br />3.306878e-6 weeks <br />7.61e-7 months <br /> time limit.

The failed assembly was replaced, the channel was satis-factorily tested and was returned to service.

In view of the nature of the failure, no further action was deemed necessary.

FAILURE DATA:

Westinghouse Electric Corp.

Power Range Channel B Drawer Detector Current Meter Assembly Prepared By R. Frahm Af[

vdE Generai Manager -

Salem Operations SORC Meeting No.

82-85 4

I l

6

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