ML20210S353

Special Rept:On 860903,north Stack Wide Range Accident Monitor Declared Inoperable Due to Failure of Sample Pump to Provide Proper Sample Flow.Caused by Torn Diaphragm.Pump Replaced.Related Correspondence

ML20210S353
Person / Time
Site:	Limerick
Issue date:	09/16/1986
From:	Leitch G PECO ENERGY CO., (FORMERLY PHILADELPHIA ELECTRIC
To:	Murley T NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I)
References
CON-#486-0996, CON-#486-996 OL, NUDOCS 8610080106
Download: ML20210S353 (4)

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j PHILADELPHIA ELECTRIC COMPANY -esenETE r ~ ~~

2301 MARKET STREET USNRC l

P.O. BOX 8699

.' PHILADELPHIA PA.19101 '86 0CT -6 P1 :14

! 0FFICE Of IEurt iA" l

00CKElitm & St.f'VICf.

September 19,198giRM:CH

- Docket No. 50-3 52 /MJ'4 h l

l Dr. Thomas E. Murley, Administrator

Itagion I U.S. Nuclear Regulatory Commission .y. '

631 Park Avenue s l King of Prussia, PA 19406 l

SUBJECT:

Special Reporting Requirement for Inoperable

• Accident Monitoring Instrumentation at Limerick Generating Station

REFERENCE:

Technical Specifications 3.3.7.5 and 6.9.2

Dear Dr. Murley:

i I! This special report is being submitted pursuant to the requirements of Limerick Technical Specifications 3.3.7.5 and 6.9.2 which state:

A g ACCIDENT MONITORING INSTRUMENTATION The accident monitoring instrumentation channels 1

3.3.7.5 shown in Table 3.3.7.5-1 shall be OPERABLE.

APPLICABILITY: As shown in Table 3.3.7.5-1.

i i.

ACTION:

f With one or more accident monitoring instrumentation channels

,: inoperable, take the ACTION required by Table 3.3.7.5-1.

ACTION 81 - With the number of OPERABLE accident monitoring instrumentation channels less than required by the Minimum Channels OPERABLE requirement, initiate the preplanned alternate method of 8610080106 860916 PDR ADOCK 05000352 S PDR DS03

l

't Dr. Thomas E. Murley September 19, 1986  !

Page 1!

monitoring the appropriate parameters within 72 hours8.333333e-4 days <br />0.02 hours <br />1.190476e-4 weeks <br />2.7396e-5 months <br />, and

a. Either restore the inoperable channel (s) to

' OPERABLE status within 7 days of the event, or

b. Prepare and submit a Special Report to the Commission pursuant to Specification 6.9.2 within

- 14 days following the event outlining the action taken, the cause of the inoperability and the plans and schedule for restoring the system to

- OPERABLE status.

SPECIAL REPORTS 6.9.2 Special reports shall be submitted to the Regional Administrator of the Regional Office of the NRC within the time period specified for each report.

DESCRIPTION OF EVENT:

On September 3, 1986 at 0925 hours0.0107 days <br />0.257 hours <br />0.00153 weeks <br />3.519625e-4 months <br /> with the unit at power, the North Stack Wide Range Accident Monitor (WRAM) was declared inoperable because the sample pump for the low range detector failed to provide proper sample flow. Upon investigating the sample flow alarm, the problem was determined to be pump in-leakage. The sample pump is a y

diaphragm positive displacement pump manufactured by Thomas a Industries (Model 727CM39).

4 CONSEQUENCES OF THE EVENT:

The consequences of this condition are minimal. An alternate method of monitoring the North Stack was maintained during the period of WRAM inoperability.

CAUSE OF THE EVENT:

The cause of the event was failure of the low range detector sample pump to provide proper sample flow due to a torn l diaphragm which resulted in pump in-leakage. A two day delay in obtaining a replacement pump resulted from the spare pump l

having an incorrect spare parts inventory code.

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l Dr. Thomas E. Murley September 19, 1986 Page 3 l

. CORRECTIVE ACTIONS:

The preplanned alternate method of monitoring the North Stack was initiated in accordance with Technical Specification Table 3.3.7.5-1. Although the pump was replaced and provided adequate flow prior to expiration of the action statement, the plant staff took a conservative position and did not declare the WRAM operable until the operability Surveillance Test for the WRAM was completed. The Surveillance Test was completed and the WRAM was returned to service at 2110 hours0.0244 days <br />0.586 hours <br />0.00349 weeks <br />8.02855e-4 months <br /> on September 10, 1986 which was 7.5 days after the event, thus requiring a special report.

ACTION TAKEN TO PREVENT RECURRENCE:

Two additional sample pumps have been acquired in order to prevent delays in obtaining replacement sample pumps. The incorrect spare parts inventory code has been corrected.

PREVIOUS SIMILAR OCCURRENCES:

No previous similar occurrences have been reported at the Limerick Generating Station.

Should you require additional information, please do not hesitate to contact us. The submittal of this report was delayed as a result of the time necessary to fully investigate this event in order to provide a complete and thorough report. We regret any inconvenience the delay may have caused.

Very truly yours,

^'

f]. l 'l . .I (.

[ I G. M. Leitch Superintendent Nuclear Generation Division

- cc: E. M. Kelly, LGS Resident Site Inspector See Attached Service List

r

cc: Troy B. Conner, Jr., Esq.

Benjamin H. Vogler, Esq.

Mr. Frank R. Romano Mr. Robert L. Anthony Ms. Maureen Mulligan j Charles W. Elliott, Esq.

' Barry M. Hartman, Esq.

Mr. Thomas Gerusky Directo,r, Penna. Emergency Management Agency Angus Love, Es*:.

David Wersan, Esq.

Robert J. Sugarman, Esq.

Kathryn S. Lewis, Esq.

Spence W. Perry, Esq.

- Jay M. Gutierrez, Esq.

Atomic Safety & Licensing Appeal Board Atomic Safety & Licensing Board Panel Docket & Service Section (3 Copies)

E. M. Kelly Timothy R. S. Campbell July 23, 1986 t

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