ML20128E537

Discusses Proposed License Amend to Update Pressure Temp Limits & Low Temp Overpressure Protection Enable Temps, Per Commitment in Util .Pressure Temp Limit Calculations Currently Being Reviewed

ML20128E537
Person / Time
Site:	San Onofre
Issue date:	12/02/1992
From:	Rainsberry J SOUTHERN CALIFORNIA EDISON CO.
To:	NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM)
References
NUDOCS 9212080117
Download: ML20128E537 (2)

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U. S. Nuclear Regulatory Commission Attention: Document Control Desk Washington, D.C. 20555 Gentlemen:

Subject:

Docket No. 50-361 and 50-362 Proposed License Amendments to Update the Pressure-Temperature Limits and Low Temperature Overpressure Protection Enable Temperaturee San Onofre Nuclear Generating Station Units 2 and 3

References:

1. February 24, 1992, letter from R. M. Rosenblum (SCE) .to Document Control Desk,

Subject:

Docket Nos. 50-361 and 50-362, Proposed License /,mendments to Update the. Pressure-Temperature Limits and Low Temperature Overpressure Protection Enable Temperatures, San Onofre Nuclear Generating Station, Units 2 and 3

2. September 9, 1992, letter from Harold B. Ray (SCE) to Document Control Desk,

Subject:

Docket Nos. 50-362, Amendment.

Application No. 102, Changes to Technical Specifications 3/4.4.8.1, 3.4.8.3.1, and 3.4.8.3.2, San Onofre Nuclear Generating Station, Unit 3 By Reference 1 Southern California Edison (SCE) 4.ommitted to submit 1) by September 11, 1992, a license amendment request updating the existing Unit 3 Reacter Coolant System (RCF) Pressure-Temperature (PT) lini:ts and 2)-by October 30, 1992, a license amendment request updating the existing Ur.it 2 PT limits.

By Reference 2 the above commitment for San Onofre Unit 3 was fulfilled.

'However, in finalizing-the Unit 2 PT limits, questions arose concerning the conservatism of the calculations and the October 30, 1992 commitment for San Onofre Unit 2 could not be met. This concern.also applies- to the Unit 3 PT limits submitted by Reference 2. We are currently reevaluathg the Units 2 and 3 P1 limit calculations and will revise these calculations before submitting the license amendment request to update the existing Unit 2 PT limits.

Therefore, the Unit ?. license amendment request will be submitted by May 7, 1993. If the results of our reevaluation also require a change to the PT limits for Unit 3, we will submit a revision to Reference 2 by May 7, 1993.

9212080117 DR 921202 ADOCK 05000351-  ! h=

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.- i Docilment Control Desk At San Onofre Units 2 and 3 we have implemented administrative PT limits that are more restrictive than the PT limits from the calculations of record. The  !

results of our preliminary reevaluation indicate these administrative limits remain bounding. Therefore, there is no safety impact to the delay in the submittal of the updates for the Units 2 and 3 PT limits.

if you have any questions regarding these matters, please let me know.

Very truly yours, cc: J. B. Martin, Regional Administrator, NRC Region V C. Caldwell, NRC Senior. Resident Inspector, San Onofre Units 1, 2 and 3 H. B. Fields, NRR-Project Manager, San Onofre Units 2 and.3 b

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