05000311/LER-1983-006, Forwards LER 83-006/04L-0.Detailed Event Analysis Encl

Forwards LER 83-006/04L-0.Detailed Event Analysis Encl

ML20023C478
Person / Time
Site:	Salem
Issue date:	05/06/1983
From:	Zupko J Public Service Enterprise Group
To:	Allan J NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I)
Shared Package
ML20023C479	List: 05000311/LER-1983-006, Forwards LER 83-006/04L-0.Detailed Event Analysis Encl 05000311/LER-1983-006-04, /04L-0:on 830408,decreased Sensitivity of Channel 2R41C Plant Vent Noble Gas Monitor Rendered Waste Gas Discharge Line Automatic Isolation Feature Inoperable.Caused by Leakage on Monitor Sample Lines & Internal Connections
References
NUDOCS 8305170367
Download: ML20023C478 (4)

LER-1983-006, Forwards LER 83-006/04L-0.Detailed Event Analysis Encl

Event date:
Report date:
3111983006R00 - NRC Website

text

s O PSEG Public Service Electric and Gas Company P.O. Box E Hancocks Bridge, New Jersey 08038 Salem Generating Station May 6, 1983 Mr. J. Allan Acting Regional Administrator USNRC Region 1 631 Park Avenue King of Prussia, Pennsylvania 19406 Dear Mr. Allan LICENSE NO. DPR-75 DOCKET NO. 50-311 REPORTABLE OCCURRENCE 83-006/04L Pursuant to the requirements of Salem Generating Station Unit No. 2, Environmental Technical Specifications, Section 5.6.2, we are submitting Licensee Event Report for Reportable Occurrence 83-006/04L.

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

Sincerely yours, u f /*

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J. M.

Zupko, Jr.

General Manager -

Salem Operations RF:ks'J4[

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Report Number:

83-006/04L Report Date:

05-04-83 Occurrence Date:

04-08-83 Facility:

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

Gaseous Waste Effluent Monitors - Waste Gas Discharge Line Automatic Isolation Feature - Inoperable.

This report was initiated by Incident Report 83-063 EDEDITIONS PRIOR TO OCCURRENCE:

Mode 5 - RX Power 0 % - Unit Load 0 MWe, DESCRIPTIONJ0F OCCURRENCE:

On April 8, 1983. the results of an in-plant response comparison between the Channel 2R41C Plant Vent Noble Gas Monitor and the Channel 2R16 Plant Vent Gross Activity Monitor indicated that the sensitivity of Channel 2R41C was a factor of 9 lower than the factory calibration data.

The in-plant response comparison was the first of its kind conducted between the channels, and was performed during the first unit refueling, when low background levels and stored waste gas became simultaneously available.

The decreased channel sensitivity rendered the waste gas discharge line automatic isolation feature inoperable.

This feature is required to be operable during gaseous releases from the Waste Gas Hold-up System, in accordance with Environmental Technical Specifications (ETS) 2.3.3d.

Based on data from other Radiation Monitoring System channels and effluent sampling, no ETS limits were exceeded.

APPARENT CAUSE OF OCCURRENCE:

Investigation of the disparity in sensitivity values revealed that leakage on the monitor suction lines and internal connections had resulted in dilution of the sample flow by clean air from the adjacent Auxiliary Building spaces.

The dilution in turn decreased channel sensitivity.

Due to the design of the sampling system, such leakage would not result in a Low Flow alarm.

A survey of appropriate surveillance procedures showed that the leakage would not be detected by the testing involved.

The occurrence therefore apparently involved isolated inadequacies in procedural controls for surveillance of the operability of the device.

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LER 006/ 04L~

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ANALYSIS OF ' OCCURRENCE:

Operabilit o rthe waste gas discharge line automatic isolation feature is-required to' insure monitoring and control of gaseous releases'from the primary waste gas holdup system.

Control of gaseous releases to unrestricted areas insures that the concentration limits specified in 10CFR Part 20 are not. exceeded.

^

i-Further evaluation of the monitor data indicated Ithat no inadvertent releases t,o thG environme'ptchad occurred since unit startup.

The

. analysis' alsr, demonstrated that the ETS limits were not at any time

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exceeded.

Thi event therefore did not result in any adverse impact on the environment.

.The containment purge and pressure relief function utilizes the

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Channel'2R12A monitor and was not affected by,the problems with the plant vent monitor.

Further..siampling of waste gas decay tank

?. contents is conducted to insurcithat the release of a tank will not r,esult in exceedin5 the ETS 11dits.

The Chant.el 2R42 area monitor was operable and would have alarmed if the" activity in the tanks reached a level which could result in/exceedi~ng the. limits.

Finally, the Channel 2R16 gross activity ' plant vent monitor would have alarmed if the ETS limits were exceeded dGiin~g'a release.

Operator action in response.to either sample information or monitor alarms would have prevented' 6r stopped any release involved.

ETS Section 5.4 requires, if a limiting condition for operation is exceeded: '

Remedial action 'as permitted by the ETS shall be taken until the condition can be met, the event will be investigated by the SORC, and a report prepared and submitted as specified in Section 5.6.2.

CORRECTIVE ACTION

a No further waste gas releases were necessary following dicovery of the problem, due to the unit being shutdown for refueling.

This report and the corresponding SORC review meet the requirements of ETS Section 5.4.

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LER 83-006/04L CORRECTIVE ACTION: (cont'd)

During the shutdown, the plant vent monitor detector and electronics were relocated to to provide improved ambient conditions for the circuitry.

The leaks in the system were repaired. and a pressure and leak test was satisfactorily performed.

The monitor will be recalibrated and returned to an operable status.

To prevent future l

problems with leakage, the requirement to pressure check monitor sampling lines each refueling will be incorporated into the Inspection Order system.

FAILURF DATA:

Not Applicable k'

[

I Prepared By R.

Frahm VGene"ral Manager -

SORC Meeting No.87-060 l

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