ML20205G261

Special Rept:On 990328,3RT-7865 Was Removed from Service. Monitor Is Scheduled to Be Returned to Service Prior to Mode 4 Entry (Early May 1999) Which Will Exceed 72 H Allowed by LCS 3.3.102.Alternate Method of Monitoring Will Be Used

ML20205G261
Person / Time
Site:	San Onofre
Issue date:	04/01/1999
From:	Scherer A SOUTHERN CALIFORNIA EDISON CO.
To:	NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM)
References
NUDOCS 9904070184
Download: ML20205G261 (2)

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A. Edward scherer

- gg souisitus cAurousir d EDISON 5"Lgm xn unsas njuismow-cen, April 1,1999 U. S. Nuclear Regulatory Commission Document Control Desk Washington, D.C. 20555 - 4

Subject:

Docket 50-362 Special Report - Radiation Monitoring instrumentation (RMI) )

San Onofre Nuclear Generating Station, Unit 2

Reference:

Letter from A. E. Scherer (SCE) to Document Control Desk (USNRC),

"Special Report: Licensee Controlled Specification 3.3.102,

' Radiation Monitoring Instrumentation (RMI),' San Onofre Nuclear Generating Station, Unit 3," dated January 21,1999 I i

Gentlemen:

This letter provides a Special Report to the NRC in accordance with Licensee l Controlled Specification (LCS) 3.3.102. This LCS requires Southern California Edison (SCE) to maintain two Plant Vent Stacks Wide Range Noble Gas Monitor channels (2RT-7865 and 3RT-7865) operable when either Unit is operating in Modes 1 through

3. When two Wide Range Monitor channels are not restored to operable status within 72 hours8.333333e-4 days <br />0.02 hours <br />1.190476e-4 weeks <br />2.7396e-5 months <br />, a Special Report must be submitted within the next 14 days.

Unit 3 is currently in a refueling outage. During the outage, SCE plans to modify 3RT-7865 to allow this monitor to provide input to the new Radiation Monitoring Data Acquisition System. To implement this change, SCE removed 3RT-7865 from service on March 28,1999. The monitor is scheduled to returned to service prior to MODE 4 entry (currently forecast for early May,1999) which will exceed the 72 hours8.333333e-4 days <br />0.02 hours <br />1.190476e-4 weeks <br />2.7396e-5 months <br /> allowed be LCS 3.3.102. In the interim, an alternate method of monitoring will be used as required by the LCS. (An earlier companion change to Unit 2 monitor 2RT-7865 was discussed in the above referenced letter.)

D 9904070184 990401 5 D

PDR ADOCK 05000362 s PoR , /

P. O. Nx 128 San Clemente, CA 92674-0128 949- % 8-7501 Fax 949-368-7575

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Qocument Control Desk April 1,1999 l l

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! This letter contains no new commitments. If you require any additional information, please advise. i l

Sincerely, 1

cc: E. W. Merschoff, Regional Administrator, NRC Region IV J. A. Sloan, NRC Senior Resident inspector, Units 2 and 3 L. Raghaven, NRC Project Manager, San Onofre Units 2 and 3 i institute of Nuclear Power Operations (INPO) 1 r

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