05000272/LER-2078-002-03, Failure of Loop 13 Channel

Failure of Loop 13 Channel

ML19031A903
Person / Time
Site:	Salem
Issue date:	02/03/1978
From:	Librizzi F Public Service Electric & Gas Co
To:	Grier B NRC/IE, NRC Region 1
References
LER 1978-002-03
Download: ML19031A903 (5)

LER-2078-002, Failure of Loop 13 Channel

Event date:
Report date:
2722078002R03 - NRC Website

text

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• ~.)PS~G Public Service Electric and Gas Company Mr. Boyce H~ Grier Director of USNRC Off ice of Inspections and Enforcements Region 1 631 Park Avenue King of Prussia, Pennsylvania 19406

Dear Mr. Grier:

LICENSE NO. DPR-70 DOCKET NO.

50~272 REPORTABLE OCCURRENCE 78-02/03L Pursuant to the requirements of Salem Generating Station Unit No. 1 Technical Specifications, Section 6.9.1, we are submitting Licensee Event Report for Reportable Occurrence 78*-02/03L.

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

Sincerely yours, F. P. Librizzi General Manager -

Electric Production CC:

Director, Office of Inspection and Enforcement (30 copies)

Director, Office of Management Information and Program Control (3 copies)

The Energy People l/ooa/ s W 0 I 1

95-2001 300M 8-75

__ Report Number:

Report Date:

. Occurrence Date:

Facility:

78~02/03L 1/.78 1/6/78 Salem Generating Station Public Service Electric & Gas Company Hancocks Bridge, New Jersey 08038 IDENTIFICATION OF OCCURRENCE:

Inoperable Reactor Trip Instrumentation, Reactor Coolant Loop 13 OTt:.T CONDITIONS PRIOR TO OCCURRENCE:

Operational Mode 1

'Reactor Power:

88% increasing to 100%

DESCRIPTION OF OCCURRENCE:

At 0650 hours0.00752 days <br />0.181 hours <br />0.00107 weeks <br />2.47325e-4 months <br />, while increasing reactor power to 100%, the "Over-temperature t:.T.

Block Rod Withdrawal and Start Turbine Runback" alarm was received in the control.room.

Loop 13 OTt:.T.channel had failed.

The control operator blocked loop 13 t:.T and Tavg Deviation and declared loop 13 OTt:.T channel inoperable.

Technical Specifica-tion 3.3.1.1 Action Statement No. 2 was implemented and.the OTt:.T channel was placed in the tripped condition..

Instrumentation per-sonnel investigated and reworked loop 13 OTt:.T channel such that the channel was returned to service at 1530 hours0.0177 days <br />0.425 hours <br />0.00253 weeks <br />5.82165e-4 months <br />.

Action State-ment No. 2 for LCO 3.3.1.1 was then terminated.

DESIGNATION OF APPARENT CAUSE OF OCCURRENCE:

The.cause* of this occurrence was the failure of a Hagan Function Generator.

The function generator failure resulted from a failed capacitor.

The failure of this capacitor reduced the OTt:.T set-point to the actual t:.T value which is in the conservative direction.

ANALYSIS OF OCCURRENCE:

Technical Specification Action Statement No. 2 for LCO 3.3.1.l states that with the number of operable channels one less than the total number of channels, startup and/or power operation may proceed provided the following conditions are satisfied:

a)

The inoperable channel is placed in the tripped condition within 1 hour1.157407e-5 days <br />2.777778e-4 hours <br />1.653439e-6 weeks <br />3.805e-7 months <br />.

b)

The minimum channels operable requirement is met.

c)

Either, Thermal Power is restricted to < 75% of Rated Thermal Power and the Power Range, Neutron Flux-Trip Setpoint is reduced to < 85% of Rated Thermal Power within 4 hours4.62963e-5 days <br />0.00111 hours <br />6.613757e-6 weeks <br />1.522e-6 months <br />; or, Quadrant Power Tilt Ratio is monitored at least once per 12 hours1.388889e-4 days <br />0.00333 hours <br />1.984127e-5 weeks <br />4.566e-6 months <br />.

LER 78-02/03L 1/11/78 L90P 13 OT~T channel was placed in the tripped condition within 1

~.hour. All other OT~T channels were operable throughout this event~

' The channel was returned to service within 12 hours1.388889e-4 days <br />0.00333 hours <br />1.984127e-5 weeks <br />4.566e-6 months <br />, therefore, monitoring of the Quadrant Power Tilt Ratio was not required.

CORRECTIVE ACTION

The failed function generator was taken to the instrumentation repair shop where investigation revealed the failed capacitor.

The capacitor was replaced and the unit was bench tested with satisfactory results.

The function generator was returned to service in the loop 13 OT~T channel.

Functional testing confirmed operability.

FAILURE DATA:

Function Generator Manufacturer: -

Type:

Hagan Controls Orville, Ohio 4111513 Prepared by T. L. Spencer

~~~~~--=-~~~~~~~

SORC Meeting No.

4-78

--.~~.....,-~~~~~~-

Manager.~

al em Genera ting Station

e.

LICENSEE EVENT REPORT REPORT DATE: 1/11/78 CONTROL BLOCK UCENSEE NAME 6

LICENSE NUM8ER IOIOl-IOIO!OIOIOl-1 OIOJ 15 2

REPORT REPORT CATEGORY TV" SOURCE OOCKET NUMBER e

LICENSE TVPI!:

k 41 11 11 11 l~

E.Vl!:NT OAT£

~

CON'T's,-1-J ~ ~ ~p I 51 o I -I o I 2 I 71 2J I 0111 01 6171 81 69 14 EVENT OESCl'llPTION EVENT TVPI!:

REPORT OATllt I 0 I 11 11 11 7 I ~

75

@))I While increasing power to

• iOO%., Loop 13 OTf:.T Channel failed.

Action I

7 8 9 ao

@)) Statement 2 for LCO 3.3.1.1 was implemented and the failed cahnnel place 7

8

@:E]I in the tripped condition.

All remaining channels were operable.

The J 1 el *

@J!ll failed capacitor was replaced and the function generator recalibrated.

I 1

s g ao [fil!] I This is the first OTAT channel failure.

(78-02/03Ll I

7 8 9 PRIME SQ SVSTl!:M

CAUSE

COMPONENT COMPONENT r,;'T;'1 COO£ COOE COMPONENT COOE SUPPl..IER MANUFACTURER l:!.1!.Jl.LlA.J

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8 9 10 11 12 17 43 44 47 VIOLATION lliJ 48 CAUSE OESCl'llftTlON

~!This occurrence was caused by a failed capacitor in a Hagan Control.

@]f 1\\.ype 4111513 Furiction Generator.

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ACTIVITY CONTENT Rlltl..EASEO QI' RELEASE AMOUNT OF ACTIVITY

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PHONI: (609)365-7000 Ext. Salem 528

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