ML19294B331
| ML19294B331 | |
| Person / Time | |
|---|---|
| Site: | Grand Gulf  |
| Issue date: | 02/11/1980 |
| From: | Baer R Office of Nuclear Reactor Regulation |
| To: | Stampley N MISSISSIPPI POWER & LIGHT CO. |
| References | |
| NUDOCS 8002280197 | |
| Download: ML19294B331 (3) | |
Text
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FEB 111980 Docket Nos. 50-416 and 50-417 Mr. N. L. Stampley Vice President - Production Mississippi Power and Light Company P. O. Box 1640 Jackson, Mississippi 39205
Dear Mr. Stampley:
SUBJECT:
REVISED STAFF POSITION:
REGULATORY GUIDE 1.68, " INITIAL TEST PROGRAMS FOR WATER-COOLED REACTOR POWER PLANTS" (Grand Gulf Nuclear Station, Units 1 and 2)
In our letter of January 22, 1980, we transmitted a staff position (423.38) con-cerning your operating license application for the Grand Gulf Nuclear Station regarding full-load testing of transformers providing power to vital buses.
This position has been revised to reflect the testing requirements of the Power Systems Branch position on degraded grid voltage, which has been applied to all plants in licensing review since 1976.
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Our revised position is enclosed and should be substituted for 423.38. The test description in Chapter 14 of your FSAR should be revised to reflect this position instead of the position previously transmitted.
Sincercly, obert L. Baer, Chief Light Water Reactors Branch No. 2 Division of Project Management
Enclosure:
Revised Staff Position ces w/ enclosure:
See next page 8002280
Mr. N. L. Stampley FEB 1 I 1980 Mr. N. L. Stanpley Vice President - Production Mississippi Power and Light Canpany P. O. B ox 1640 Jackson, Mississippi 39205 ccs: Mr. Robert B. McGehee, Attorney Wise, Carter, Child, Steen and Caraway P. O. Box 651 Jackson, Mississippi 39205 Troy B. Conner, Jr., Esq.
Conner, Moore and Corber 1747 Pennsylvania Avenue, N. W.
Washington, D. C.
20006 Mr. Adrian Zaccaria, Project Engineer Grand Gul f Nuclear Station Bechtel Power Corporation Gaithersburg, Maryland 20760
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FEB 1 1 1980
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ENCLOSURE t
STAFF POSITION (Revised) 423.38 It has come to our attention that some applicants did not intend to conduct confirmatory tests of some distribution systems and transformers supplying power to vital buses as required by Position 3 of Regulatory Guide 1.68, and more specifically by Part 4 of the staff position on degraded grid voltage (applied to all plants in licensing review by the Power Systems Branch since 1976).
Part 4 of the degraded grid voltage position states as follows:
"4.
The voltage levels at the safety-related buses should be optimized for the full load and minimum load conditions that are expected throughout the anticipated range of voltage s
variations of the offsite power source by appropriate adjustment of the voltage tap settings of the intervening transformers. We require that the adequacy of the design in this regard be verified by actual measurement and by correlation of measured values with analysis results.
Provide a description of the method for making this verification; before initial reactor power operation, provide the documentation required to establish that this verification has been accomplished."
Your test description in FSAR Chapter 14 does not contain sufficient detail for us to determine if you intend to conduct such a test.
It is our position that confirmatory tests of all vital buses must be conducted including all source:
of power supplies to the buses. Modify your test description to indicate that this testing will be conducted in accordance with Regulatory Guide 1.68 and the above cited position.
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