05000311/LER-1982-060, Forwards LER 82-060/03L-0.Detailed Event Analysis Encl

Forwards LER 82-060/03L-0.Detailed Event Analysis Encl

ML20063F941
Person / Time
Site:	Salem
Issue date:	08/18/1982
From:	Midura H Public Service Enterprise Group
To:	Haynes R NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I)
Shared Package
ML20063F943	List: 05000311/LER-1982-060, Forwards LER 82-060/03L-0.Detailed Event Analysis Encl 05000311/LER-1982-060-03, /03L-0:on 820722,level Accumulators 24 & 23 Determined Below Operating Band & Declared Inoperable.Caused by Drift of Level Indications.Sightglass Indications Installed on Both Accumulators
References
NUDOCS 8208310395
Download: ML20063F941 (4)

LER-1982-060, Forwards LER 82-060/03L-0.Detailed Event Analysis Encl

Event date:
Report date:
3111982060R00 - NRC Website

text

.

'O PSEG i

Public Service Electric and Gas Company P.O. Box E Hancocks Bridge, New Jersey 03038 i

Salem Generating Station August 18, 1982 1

Mr.

R.

C.

Haynes i

Regional Administrator USNRC Region 1 631 Park Avenue King of Prussia, Pennsylvania 19406 I

Dear Mr. Haynes:

LICENSE NO. DPR-75 3

DOCKET NO. 50-311 REPORTABLE OCCURRENCE 82-060/03L Pursuant to the requirements of Salem Generating Station j

Unit No.

2, Technical Specifications, Section 6.9.1.9.b, we are submitting Licensee Event Report for Reportable a

Occurrence 82-060/03L.

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

Sincerely yours, l

l<

r H.

J.

Midura j

General Manager -

Salem Operations RH:ksfj[ff CC:

Distribution I

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l 8200310395 820818 PDR ADDCK 05000311 S

PDR The Energy People gfW u m aa.o o et

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Report Number:

82-060/03L Report Date:

08-18-82 l

)

Occurrence Date:

07-22-82 Facility:

Salem Generating Station, Unit 2 Public Service Electric & Gas Company Hancocks Bridge, New Jersey 08038 IDENTIFICATION OF OCCURRENCE:

Emergency Core Cooling System-Accumulator - Inoperable.

This report was initiated by Incident Reports82-189 and 82-190.

l CONDITIONS PRIOR TO OCCURRENCE:

Mode 1 - Rx Power 83% - Unit Load 890 MWe.

DESCRIPTION OF OCCURRENCE:

At 1340 hours0.0155 days <br />0.372 hours <br />0.00222 weeks <br />5.0987e-4 months <br />, on July 22, 1982, during normal operation, the Control Room Operator determined the contained volume of i

borated water in No. 24 Accumulator, as indicated by the temporary sightglass, was less than the minimum volume required by Technical Specification Limiting Condition for Operation 3.5.lb.

The accumulator was immediately declared inoperable j

and Action Statement 3.5.la was entered at 1340 hours0.0155 days <br />0.372 hours <br />0.00222 weeks <br />5.0987e-4 months <br />.

The l

control room operator commenced filling the accumulator, however, by 1440 hours0.0167 days <br />0.4 hours <br />0.00238 weeks <br />5.4792e-4 months <br />, the level still was not within specified limits.

A unit load reduction was commenced in compliance with the Action Statement.

The accumulator level was increased to within specified limits.

At 1444 hours0.0167 days <br />0.401 hours <br />0.00239 weeks <br />5.49442e-4 months <br />, l

July 22, 1982, No. 24 Accumulator was declared operable, Action l

Statement 3.5.la was terminated, and normal power operation l

was resumed.

Later that day, at 1743 hours0.0202 days <br />0.484 hours <br />0.00288 weeks <br />6.632115e-4 months <br />, a temporary sight-glass was also installed on No. 23 Accumulator.

The control room operator determined, by sightolass indication, that the contained volume of borated water in No. 23 Accumulator, was less than the minimum required by Technical Specification Limiting Condition for Operation 3.5.1.

The accumulator was immediately declared inoperable and at 1743 hours0.0202 days <br />0.484 hours <br />0.00288 weeks <br />6.632115e-4 months <br />, Action Statement 3.5.la was entered.

The control room operator commenced filling the accumulator, however, by 1843 hours0.0213 days <br />0.512 hours <br />0.00305 weeks <br />7.012615e-4 months <br /> the accumulator level was j

not within the specified limits.

Preparation for a unit load reduction was commenced in compliance with the Action Statement.

i l

The accumulator level was raised to within specified limits.

At i

1844 hours0.0213 days <br />0.512 hours <br />0.00305 weeks <br />7.01642e-4 months <br />, July 22, 1982, No. 23 Accumulator was declared operable and Action Statement 3.5.la was terminated.

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LER 82-060/03L -

DESIGNATION OF APPARENT CAUSE OF OCCURRENCE:

The cause of both occurrences was drift of level indications.

Each accumulator has two remote level indications.

An increasing difference between the indicated levels for No. 24 Accumulator had been noted.

Because the level transmitter isolation valves had some leakage, the transmitters could not be calibrated while the unit was operating.

Therefore, No. 24 Accumulator level was maintained to keep both indications within the specified limits.

When the difference in level indications for No. 24 Accumulator became excessive, a sight-glass was installed.

The sightglass indication revealed that the actual level was below specified limits.

The Action State-ment was immediately entered and the accumulator level was restored to normal operating band.

A similar problem of level indication drift for No. 23 Accumulator was also experienced.

In this case, the lower indication had been declared inoperable because it seemed to be inaccurate.

No. 23 Accumulator level had been maintained to keep the higher indication within the operating band.

The isolation valves for the level transmitters had some leakage, therefore, No. 23 Accumulator level transmitters could not be calibrated while operating.

Because of the problem discovered with No. 24 Accumulator level indication, a sightglass was also installed on No. 23 Accumulator.

The sightglass indication revealed that the accumulator actual level was below specified limits.

The Action Statement was immediately entered, and the accumulator level was restored to normal operating band.

ANALYSIS OF OCCURRENCE:

The operability of each Reactor Coolant System (RCS) accumulator ensures that a sufficient volume of borated water will be immediately forced into the reactor core through each of the cold legs in the event the RCS pressure falls below the pressure of the accumulators.

This initial surge of water into the core i

provides the initial cooling mechanism during large RCS pipe ruptures.

Action Statement 3.5.la requires:

With one accumulator inoperable, except as a result of a closed isolation valve, restore the inoperable accumulator to operable status within one hour or be in hot standby within the next 12 hours1.388889e-4 days <br />0.00333 hours <br />1.984127e-5 weeks <br />4.566e-6 months <br />.

LER 82-060/03L

• ANALYSIS OF OCCURRENCE:Inoperability of one accumulator constitutes 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 noted, sightglass level indicators have been installed and accumulator levels were raised to comply with the Technical Specifications.

An operator will check the sightglass indi-cations on No. 23 and 24 Accumulators every 8 hours9.259259e-5 days <br />0.00222 hours <br />1.322751e-5 weeks <br />3.044e-6 months <br />.

The level transmitters will be calibrated at the next scheduled outage.

A Design Change Request, 2EC-1424, has been submitted to replace the level transmitters and install additional valves at the next refueling outage.

FAILURE DATA:

Barton Instrument Co.

Level Transmitter Model 384-352 Prepared By R.

Heller

/

MM Gen 6raf Manager -

Salem Operations SORC Meeting No.

82-77