ML20215C078

Special Rept:On 870518,triaxial Peak Recording Accelerograph XR-VA-151 Inoperable.Caused by Need to Remove Instrument in Support of Removing Vessel Head for Refueling.Recording Accelerograph to Be Reinstalled After Refueling

ML20215C078
Person / Time
Site:	Limerick
Issue date:	06/12/1987
From:	Cooney M PECO ENERGY CO., (FORMERLY PHILADELPHIA ELECTRIC
To:	Russell W NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I)
References
CON-#287-3840 OL, NUDOCS 8706170574
Download: ML20215C078 (3)

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'PHILADE!.PHIA ELECTRIC COMPANY ' I 2 301 MARKET STREET P.O. BOX 8699 PHILADELPHI A. PA,19101 (atsi sai soro M. J. COON EY

..6... I[E[J"S......., June 12, 1987 Docket No. 50-352 J

Mr. William T. Russell  !

Administrator '!

Region I. . . ,

U.S. Nuclear Regulatory Commission l ATTN: Document Control Desk Washington, D.C. 20555

SUBJECT:

Special Reporting Requirement for Inoperable Seismic Monitoring at Limerick Generating Station

Reference:

Technical Specification 3.3.7.2 and 6.9.2

Dear Mr. Russell:

This special report is being submitted pursuant to the q requirements of Limerick _ Technical Specifications 3.3.7.2 and 1 6.9.2 which state: i l

-SEISMIC' MONITORING INSTRUMENTATION:

l 3.3.7.2 The seismic monitoring instrumentation shown in Table 1 3.3.7.2-l* shall be OPERABLE.

APPLICABILITY: At all times.

ACTION:

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a. With one or more of the above required seismic monitoring instruments inoperable for more than 30 days, prepare and submit a Special Report to the Commission pursuant to

. e,o 1 Toe 7.

ADDCK O 70*>=

3 2 4,so PDR \

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I MC. William T. Russell June 12, 1987

, Page 2 Specification 6.9.2 within the next 10 days outlining the cause of the malfunction and the plans for restoring the instrument (s)'to OPERABLE status,

b. The provisions of Specifications 3.03 and 3.04 are not applicable.

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.SPECIAL REPORTS j l

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. ]

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DESCRIPTION OF EVENT: .

1 On May 18,-1987 with the unit shutdown, Triarial Peak Recording Accelerograph KR-VA-151 was removed from.the reactor pressure vessel head in preparation for refueling. The Triarial Peak l Recording Accelerograph is a passive device that mechanically .

records the accelerations of a seismic event. This instrument is i listed in Technical Specification Table 3.3.7.2-1 and is required i to be operable as stated in Technical Specification 3.3.7.2 above.

CONSEQUENCES OF THE EVENT:

The consequences of this condition are minimal. The control room will continue to receive notification of a seismic event because  !

the control room annunciators receive signals from components of the seismic monitoring system which are operable. Limerick has three Triaxial Peak Recording Accelerographs of which two are j still operable.  !

CAUSE OF EVENT:

The cause for the inoperability of XR-VA-151 was the need to i remove this instrument in support of removing the vessel head for refueling. >

Mg. William T. Russell June 12, 1987

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CORRECTIVE ACTIONS:-  !

XR-VA-ISl will be reinstalled after completion of refueling l activities and replacement of the vessel head. Surveillance Test i ST-2-036-402-0 will be performed to demonstrate operability of 1 the instrument.

l Should you require additional information, please do not l hesitate to contact us.

Very-truly yours, 7'

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