ML20101K383

Special Rept:On 841103,strong Motion Accelerometers 2XT- 8020C & D on Reactor Coolant Pump & Pressurizer Base Support Respectively,Declared Inoperable When Found Out of Calibr. Cause of Malfunction Unknown.Meters Shipped to Vendor

ML20101K383
Person / Time
Site:	San Onofre
Issue date:	12/13/1984
From:	Haynes J SOUTHERN CALIFORNIA EDISON CO.
To:	Martin J NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION V)
References
NUDOCS 8412310332
Download: ML20101K383 (2)

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J. G. H A Y N E S retersoNs STOttON M AN AGE ft (714)492 7700 December 13, 1984 U.S. Nuclear Regulatory Commission Office of Inspection and Enforcement Region V 1450 Maria Lane, Suite 210 Walnut Creek, California 94596-5368 Attention: Mr. J. B. Martin, Regional Administrator

Subject:

Docket No. 50-361 Special Report - Seismic Instrumentation San Onofre Nuclear Generating Station, Unit 2 Pursuant to Section 6.9.2 of Appendix A, Technical Specifications to Facility Operating License NPF-10 for San Onofre Unit 2, this Special Report is being submitted as required by Action Statement 'a' associated with Limiting Condition for Operation (LCO) 3.3.3.3. This Action Statement requires that a Special Report be prepared and submitted to +he Commission within 10 days after any of the seismic instrumentation listed in Table 3.3-7 of the Technical Specifications, is inoperable for more than 30 days. The cause of the malfunction and plans for restoring the instrument to operate status, are cutlined below.

On November 3, 1984, with Unit 2 in Mode 6, seismic instrumentation was removed from service for design change work and to perform 18-month surveillance testing. The strong-motion accelerometers 2XT-8020C and D located on the reactor coolant. pump and prenurizer base support, respectively, were declared inaperable when they failed to meet the functional calibration requirements of Procedure 5023-II-2.2. The accelerometers were removed and shipped to the vendor for appropriate calibration and/or repair. The cause of the malfunction is unknown and will be determined by the vendor. Our i investigation was not able to determine when the accelerometers became inoperable because there have been no seismic events during this period.

An update to this Special Report will be submitted addressing the significance of the event as well as the cause of the malfunction and corrective actions.

The instruments are anticipated to be placed back in service withil 30 days of this report.

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+Mr. J. B. Martin -

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l There was no impact on plant operation or the health and safety of plant personnel or the public as a result of the instruments'_ inoperability. If there are any questions regarding the above, please contact me.

Sincerely, p@

cc: F. R. Huey (USNRC Senior Resident Inspector, Units 1, 2, and 3)

J. P. Stewart (USNRC Resident Inspector, Units'2 and 3)

U.S. Nuclear Regulatory Commission Document Control Desk Institute of Nuclear Power Operations (INPO) t e

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