05000443/LER-1990-001, :on 900109,wide Range Gas Monitor Low Range Pump Found to Be Inoperable,Resulting in Noncompliance W/ Tech Specs.Caused by Regulator Isolation Valves Being Left in Open Position.Walkdown of Skids Conducted

:on 900109,wide Range Gas Monitor Low Range Pump Found to Be Inoperable,Resulting in Noncompliance W/ Tech Specs.Caused by Regulator Isolation Valves Being Left in Open Position.Walkdown of Skids Conducted

ML20006E180
Person / Time
Site:	Seabrook
Issue date:	02/08/1990
From:	Belanger R, Feigenbaum T PUBLIC SERVICE CO. OF NEW HAMPSHIRE
To:	NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM)
References
LER-90-001, LER-90-1, NYN-90034, NUDOCS 9002220236
Download: ML20006E180 (4)

LER-1990-001, on 900109,wide Range Gas Monitor Low Range Pump Found to Be Inoperable,Resulting in Noncompliance W/ Tech Specs.Caused by Regulator Isolation Valves Being Left in Open Position.Walkdown of Skids Conducted

Event date:
Report date:
Reporting criterion:	10 CFR 50.73(a)(2)(1)
4431990001R00 - NRC Website

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4 t New Ham'pshire

- Ted C. F:', 'r -.

Senior Vice President ond.

' Chief Operating Officer o

i' NYN 90034 February 8, 1990

. United States Nuclear Regulatory Commission

- Washington, DC 20555 t'

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' Attention:' Document Control Desk

Reference:

Facility, Operating License No. NPF-67 Docket No; 50-443 Subjects'LLicensee Event Report (LER) No. 90-001-00: Noncompliance with Technical' Specifications - Wide Range Gas Monitor Inoperable Gentlemen:

Enclosed please find Licensee Event Report (15R) No. 90-001-00 for Seabrook Station.

This submittal documents an event which was. identified on January 9, 1990, and is being reported pursuant to 10CFR50.73(a)(2)(1).'

'Should you require further information regarding this matter, please

- contact Mr. Richard R. Belanger at (603) 474-9521, extension 4048.

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Very truly yours.

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Ted C. Feigenba Enclosures NRC Forms 366,' 366A cci Mr. William T. Russell Regional Administrator United States Nuclear Regulatory Conunission Region I

'475 Allendale Road King of Prussia, PA 19406 Mr. Noel Dudley NRC Senior Resident Inspector P.O. Box 1149 Seabrook. NH 03874 INPO

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Records Center 1100 Circle 75 Parkway Atlanta, GA 30339 9002220236 900208 ADOCK0$00g3 y

pq New Hampshire Yonkee Division of Public Service Company of New Hampshire P.O. Box 300

• Seabrook, NH 03874

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ABSTRACT IUm/t to f 400 speces. Le., approusnerely fureen papie spece synewmven enest (161 On January 9.-1990, at 9:00am EST, while in Mode 5, during routine weekly sampling activities, the Wide Range Gas Monitor (WRGM) Icw range pump L

was found to be inoperable.

Investigation into the pump failure identified I

purge air flowing through the sample lines, resulting in non-representative samples being obtained, contrary to Technical Specification 3.3.3.10.

The purge air flowing through the sample lines was due to the regulator isolation valves which provide purge air for cleaning purposes being left in the open position during the restoration of a tagging order, 1

l The mispositioning of these valves on the purge air line to the WRGM l

sample conditioning skid was attributed to the inability to accurately l

determine the required position of the purge air line valves.

1 There were no adverse safety consequences as a result of this event.

For corrective action, the Operations Department will develop a method to determine required positions of equipment when not identified on P& ids or in procedure line ups, for tagging order restorations.

The valves involved will be controlled by an Operations procedure.

This is the first event of this type at Seabrook Station, g,,.,m 3

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] l0 0l2 OF 0 l3 79(T M ausse ausse a seeiset asar esmosant ##C #ss"i Judil(th On January 9, 1990, at 9:00 EST, during routine weekly sampling activities, the Wide Range Gas Monitor (WRGM) low range pump was found to be inoperable.

Investigation into the pump failure identified purge air flowing through the sample lines, resulting in non-representative samples being obtained, contrary to. Technical Specification 3.3.3.10.

Background

On December 26, 1989, the Wide Range Gas Monitor sample conditioning skid RM-SKD-53-1 was removed from service for~the purpose of installing a minor modification.

Both the isolation and the restoration of the skid once the modification was complete, were performed using a tagging order.

During restoration of this tagging order on January 5, 1990, regulator isolation valves 1-PAH-RM-SKD-53-1-V4-1 and 1 PAH-RM-SKD-53-1-V4-2 were opened and left in the open position.

These valves provided purge air to the WRGM sample conditioning skid RM-SKD-53-1 for the purposes of cleaning sample lines and nozzles.

l The opening of the purge air line to the sample conditioning skid provided constant flow through the skid. At some time prier to identification of this event the low range, high flow pump tripped due to a diaphragm failure.

Since the purge air line was open, this condition prevented the initiation of the low flow alarm.

The receipt of this alarm would have initiated the action required pursuant to Technical Specification 3.3.3.10.

~ Root Cause The mispositioning of the regulator isolation valves on the purge air line to the WRGM sample conditioning skid was attributed to the inability to accurately deterndne_ the required position of the purge air line valves.

Two purge air lines are associated with the WRGM sampling l

configuration. One line supplies purge air to the sample detection skid, RM-SKD-53-2, and the other to the sample conditioning skid RM-SKD-53-1.

The purge air valves, 1-PAH-RM-SKD-53-1-V4-1 and 1-PAH-RM-SKD-53-1-V4-2, that were left in the open position, are typically not shown on P&ID's sinco l

these valves are instrument valves used only for maintenance isolation.

Additionally, this type of valve is not included in valve lineups of operating procedures.

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- w==c w ass vim When the operator attempted to complete the restoration per the tagging i

order,~he discovered that he could not determine the required position of these-valves.

The operator initially contacted chemistry technicians, but they indicated they could not provide the requested information. Subsequently, the I&C technician familiar with the WRGH war contacted. After obtaining an "information only" copy of the P&ID, he informed the operator that he could not locate the valves but did locate a line leading into the sample detector skid labelled ' purge air".

Further discussion between the operator and technician led to a determina-tion that the valves probably were on the line labelled " purge air", and that the required position was open.

Subsequently, on January 5, 1990, all four instrument air purge isolation valves were placed in the open position, and the WRGM was declared s

operable.

The root cause of this event is the improper determination of required positions of equipment when not identified on P& ids or in procedure lineupt:.

Safety Consecuences l

There were no adverse safety consequences as a result of this event.

The Wide Range Gas Monitor does not perform any safety functions and the event did not interfere or inhibit any safety related equipment from performing its function.

In addition, the plant continuous air monitors were reviewed to insure that no abnormal radiological conditions existed during this period and the health and safety of employees or the public was not adversely affected by this event.

Corrective Actions

A field walkdown of all radiation monitoring skids was conducted.

l.

'This configuration was determined to be unique to the WRGM Radiation l

Monitoring Skid.

l The Operations department will develop a method to determine required positions of equipment when not identified on P& ids or in procedure lineups, for tagging order restorations.

This will be completed by May 1, 1990. -The valves involved, 1-PAH-RM-SKD-53-1-V4-1 AND 1-PAH-RM-SKD-53-1-V4-2, will be controlled by procedure OS1090.05

• Component Configuration Control".

Plant Conditions

1 At the time of this event the plant was in Mode 5.

This is the first event of this type at Seabrook Station.

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