ML13303A757
| ML13303A757 | |
| Person / Time | |
|---|---|
| Site: | Grand Gulf, Summer, San Onofre, McGuire  |
| Issue date: | 01/10/1980 |
| From: | Haass W Office of Nuclear Reactor Regulation |
| To: | Baer R Office of Nuclear Reactor Regulation |
| References | |
| NUDOCS 8001230013 | |
| Download: ML13303A757 (1) | |
Text
0 lb JAN 1 0 1980 Docket Nos.: 50-369/
50-416 M*EMOAANDUM FOR:
Robert L. Baer, Chief, Light Water Reactors Branch No. 2 Division of Project Management FROM:
Walter P. Haass, Chief, Quality Assurance Branch Division of Project Management
SUBJECT:
STAFF POSITION: MCGUIRE NUCLEAR STATION UNIT NOS. 1 & 2, VIRGIL C SUMMER NUCLEAR STATION UNIT NO. 1, SAN ONOFRE NUCLEAR GENERATING STATION UNIT NOS. 2 & 3, AND GRAND GULF NUCLEAR STATION UNIT NOS.
1 & 2 It was recently brought to our attention by IE that some applicants do not intend to perform full-load tests of vital 480 volt AC buses using all sources of power supplies to the buses.
As a result, some 4160-480 volt transformers would not be full-load tested. Our concern is that if the transformers were not properly sized, a loss of voltage or a degraded voltage condition on the vital buses during an accident could result. These applicants had committed in their FSAR to Regulatory Guide 1.68 and did not take exception to the part which states that load testing of vital buses and their power supplies should be conducted. However, their test descriptions (in FSAR Chapter 14) did not state explicitly that this testing would be conducted, and they maintained that their test programs had been approved without full-load tests of these transformers.
The subject facilities are committed to Regulatory Guide 1.68, but have not stated explicitly in their test abstracts that this testing will be conducted.
It is our position that full-load tests of the vital buses must be conducted including all power supplies. We request that you forward the enclosed staff position to these applicants.
By copy of this memo we are also forwarding the enclosure tb the DSS branches who have secondary review responsibility for Section 14.2. Any coments or recommendations from the assigned reviewers in those branches should be addressed to B. Clayton of the QAB.
O FFIC E SU RNAM E DATE~........
. F)..................
N P O
16...................9...
NRC FORM 318 (9-76) NRCM 0240
- ~U.S.
GOVERNMENT PRINTING OFFICE: 1979-289-369