ML13317A134

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Informs of Results of Effort to Examine Design Alternatives Which Would Reduce Particulate & Iodine plate-out in Sys & Enable High Radiation Grab Sample to Be Taken Per TMI Action Item II.F.1
ML13317A134
Person / Time
Site: San Onofre 
Issue date: 05/28/1982
From: Baskin K
Southern California Edison Co
To: Crutchfield D
Office of Nuclear Reactor Regulation
References
RTR-NUREG-0737, RTR-NUREG-737, TAC-44128, TASK-2.F.1, TASK-TM NUDOCS 8206030194
Download: ML13317A134 (2)


Text

Southern California Edison Company P. 0.

BOX 800 2244 WALNUTGROVEAVENUE ROSEMEAD, CALIFORNIA 91770 K. P. BASKIN TELEPHONE MANAGER OF NUCLEAR ENGINEERING, May 28, 1982 (213) 572-1401 SAFETY, AND LICENSING Director, Office of Nuclear Reactor Regulation Attention:

D. M. Crutchfield, Chief Operating Reactors Branch No. 5 Division of Licensing U. S. Nuclear Regulatory Commission Washington, D.C. 20555 Gentlemen:

Subject:

Docket No. 50-206 NUREG-0737, Item II.F.1, Sampling and Analysis of Plant Effluents San Onofre Nuclear Generating Station Unit 1 By letter dated February 24, 1982 we informed you that a possible plate-out problem may exist with the effluent monitoring system installed to meet the criteria of NUREG Item II.F.1, Attachment 2. It was also indicated that we were initiating an effort to examine design alternatives which would reduce particulate and iodine plate-out in the system and enable a high radiation grab sample to be taken. The purpose of this letter is to inform you of the results of our effort.

A review was completed of conceptual design alternatives for the Vent Stack Wide Range Gas Monitor (WRGM). The following four design alternatives were considered:

1. Increase the flow rate through the 1/4 inch 0.D. sample line.
2. Use the 3/4 inch 0.D. sample line for high radiation grab sampling.
3.

Install a third sample line to take high radiation grab samples.

4. Use the existing 3/4 inch 0.D. sample line, together with an isokinetic nozzle, and tie into the existing 1/4 inch O.D.

sample line at the sample conditioning skid.

8206030194 820528 PDR ADOCK 05000206 P

PDR

Mr. D.

May 28, 1982 All four alternatives use the concept of increasing the diameter and/or increasing the flow rate through the sample lines to reduce plate-out.

Based on ANSI N13.1-1969, Appendix B data, and on calculations completed for the existing WRGM configuration, we believe that these alternatives will provide acceptable high radiation grab sampling capability.

Your letter of May 13, 1982 suggested that a test be performed to determine actual line losses which would empirically predict the amount of plate-out that would be expected in the system. Since the above described review is based on conservative calculations, we will perform the test you suggested to determine if any modifications are necessary. A test procedure will be developed which will result in collection of the appropriate data.

The test will be conducted as soon as practicable but no later than the next refueling outage. Upon completion of the required testing of the system, an evaluation of the data will be performed and any corrective action will be determined at that time.

If you have any questions or desire additional information, please contact me.

Very truly yours, cc:

R. H. Engelken, Director, OIE, Region V