05000272/LER-1982-057, Forwards LER 82-057/03L-0.Detailed Event Analysis Encl

Forwards LER 82-057/03L-0.Detailed Event Analysis Encl

ML20027B123
Person / Time
Site:	Salem
Issue date:	08/25/1982
From:	Midura H Public Service Enterprise Group
To:	Haynes R NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I)
Shared Package
ML20027B124	List: 05000272/LER-1982-057, Forwards LER 82-057/03L-0.Detailed Event Analysis Encl 05000272/LER-1982-057-03, /03L-0:on 820803,during Routine Operation, Circulator 13A Tripped Resulting in Rapid Load Reduction. Caused by Grass & Debris Clogging Travelling Screen.Screen Cleaned & Circulator Returned to Svc
References
NUDOCS 8209160452
Download: ML20027B123 (3)

LER-1982-057, Forwards LER 82-057/03L-0.Detailed Event Analysis Encl

Event date:
Report date:
2721982057R00 - NRC Website

text

o O PSEG Public Service Electric and Gas Company P.O. Box E Hancocks Bridge, New Jersey 08038 Salem Generating Station August 25, 1982 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 82-057/03L Pursuant to the requirements of Salen Generating Station Unit No.

1, Technical Specifications, Section 6.9.1.9.b, we are submitting Licensee Event Report for Reportable Occurrence 82-057/03L.

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

Sincerely yours, j f,, ') i f 'e b w J H.

J.

Midura General Manager -

Salem Operations RF:ks M CC:

Distribution l

i 8209160452 820825 PDRADOCK05000g S

W The Energy People A

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~.o n o u n et L

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w Report Number:

82-057/03L Report Date:

08-25-82 t

Occurrence Date:

08-03-82 Facility:

Salem Generating Station, Unit 1 Public Service Electric & Gas Company Hancocks Bridge, New Jersey 08038 IDENTIFICATION OF OCCURRENCE:

Axial Flux Distribution - Out of Specification.

This report was initiated by Incident Report 82-209.

CONDITIONS PRIOR TO OCCURRENCE:

Mode 1 - Rx Power 80% - Unit Load 890 MWe.

DESCRIPTION OF OCCURRENCE:

At 1427 hours0.0165 days <br />0.396 hours <br />0.00236 weeks <br />5.429735e-4 months <br />, August 3, 1982, during routine operation, the Control Operator observed a No. 13A Travelling Screen High Differential Pressure Trip alarm.

At the time of the occurrence, Nos. 12B and 13B Circulators were already out of service for maintenance; with 3 out of 6 of the circulators inoperable, vacuum started to decrease rapidly.

The operator commenced reduction of turbine load in order to maintain vacuum, and due to the temperature error, automatic insertion of the control rods occurred.

Axial Flux Difference (AFD) went out of the

+6,

- 9% target. band as a result of i

the rod insertion'and Technical Specification Action Statement l

3.2.1.a.2.a was entered.

Rx power was stabilized at 65%, and the operator commenced boration of the Reactor Coolant System to restore the rods to a normal position.

AFD returned to within the target band at 1505 hours0.0174 days <br />0.418 hours <br />0.00249 weeks <br />5.726525e-4 months <br />, and Action Statement 3.2.1.a.2.a was terminated.

A total of 35 minutes penalty deviation was accumulated.

AFD was maintained within the limits of Technical Specification Figure 3.2-1 l

throughout the occurrence.

DESIGNATION OF APPARENT CAUSE OF OCCURRENCE:

No. 13A Circulator tripped due to a high differential pressure caused by grass and debris clogging the travelling screen.

Floating materials are routinely drawn into the screens by the large volumes of water moved by the circulators.

No. 13B Circu-(

lator was out of service due to its pump being removed for inspection and repair.

No. 12B Circulator had been removed from service earlier that day for routine travelling screen inspection.

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~LER 82-057/03L !

.~

ANALYSIS OF OCCURRENCE:

Limits on AFD insure core thermal limits are not exceeded during normal operation, including periods of xenon redistribution.

The AFD band also insures that the initial core thermal conditions assumed for events analyzed in the FSAR are met.

Deviation of AFD from the target band will not affect xenon distribution sufficiently to change the peaking factor envelope upon return to power, provided thermal power, total deviation and duration are controlled.

Action Statement 3.2.1.a.2 requires:

Between 50% and 90% of rated thermal power, power operation may continue, provided the indicated AFD has not been outside of the

+6,

- 9% target band for more than 1 hour1.157407e-5 days <br />2.777778e-4 hours <br />1.653439e-6 weeks <br />3.805e-7 months <br /> penalty deviation cumulative during the previous 24 hours2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br />, and the indicated AFD is within the limits of Figure 3.2-1 of the Technical Specification; otherwise, reduce thermal power to less than 50% of rated power within 30 minutes and reduce the Power Range Neutron Flux-High trip setpoints to less than or equal 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 />.

As noted, the plant was maintained within the limits specified in the action statement, and consequently no risk to the health or safety of the public was involved.

The event 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:

The clogged screen was cleaned, and No. 13A Circulator was returned to service.

With AFD back in the target band, load escalation was commenced.

No. 12B Circulator was returned to service; No. 13B Circulator is still out of service pending completion of repairs.

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FAILURE DATA:

Rex Chainbelt Travelling Screen Chain Link Prepared By R. Frahm

/

c d"d Generdl Manager -

I Salem Operations SORC Meeting No.

82-78 i

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