ML20203N873
| ML20203N873 | |
| Person / Time | |
|---|---|
| Site: | Summer  |
| Issue date: | 04/23/1986 |
| From: | Nauman D SOUTH CAROLINA ELECTRIC & GAS CO. |
| To: | Harold Denton Office of Nuclear Reactor Regulation |
| References | |
| GL-83-28, NUDOCS 8605060169 | |
| Download: ML20203N873 (2) | |
Text
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-s th Ca Electric & Gas Company n A. Na o
Columbia SC 29218 Nuclear Operations (803) 748 4513 SCEaG
~~
April 23, 1986 Mr. Harold R. Centon, Director Office of Nuclear Reactor Regulation U. S. Nuclear Regulatory Commission Washington, DC 20555
SUBJECT:
Virgil C. Summer Nuclear Station Docket No. 50/395 Operating License No. NPF-12 Generic Letter 83-28, Item 1.2
Dear Mr. Denton:
By a letter-dated October 29, 1985, South Carolina Electric and Gas Company '(SCE&G) was notified that the NRC Staff had completed a
, preliminary review of licensee responses to Generic Letter 83-28,
" Required Actions Based on Generic Implications of Salem ATWS Events,"
Item 1.2.
The letter indicated that SCE&G's response to Item 1.2 (contained in a letter from Mr. O. W. Dixon, Jr., to Mr. H. R. Denton dated November 4, 1983) was incomplete and additional information was required. This letter is hereby provided to supply the NRC Staff with the additional information.
Contained in an attachment to the NRC's October 29, 1985 submittal was a
, list of desirable parameters which should be recorded for post-trip review information. While SCE&G's November 4, 1983 submittal did not specifically address each of these parameters, a subsequent review has confirmed that all of these parameters are recorded. As discussed in a telephone conference with members of the NRC Staff and SCE&G on March 26, 1986, the P2500 process computer is supplemented by the Technical Support Center (TSC) computer (Safety Parameter Display System) and strip chart recorders to provide historical records of the NRC recommended parameters.
At the time of the November 4,1983 response, the capability of the P2500 process computer to store data was for a duration of two minutes before and three minutes after the post trip data acquisition sequence was triggered. However, as a result of a recent upgrade to the computer, data storage has been extended to twenty minutes pre-trip and twenty minutes post-trip for parameters scanned and stored at 10-second time intervals.
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8605060169 860423
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PDR ADOCK 05000395 P
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Mr. Harold R. Denton Page Two April 23, 1986 Event descriptors are an integral part of the Sequence-of-Events record
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printout on the P2500 alarm typer. The output format, as described in the November 4, 1983 letter, clearly identifies:the parameter descriptors which report events. The output provides the initiating event time followed by any of the other digital inputs which change state in the one minute period following the first event. This output provides for the retrieval of information in a meaningful format.
In the event of a reactor trip, station procedures require that the P2500 Sequence-of-Events printout, the P2500 Post-Trip Review' printout, the TSC Computer Discrete Changes Log and any applicable recorder chart reproductions be obtained and retained in the Off-Normal Occurrence Report records. These records are required to be retained for the life of the plant as permanent documents.
Therefore, these records are maintained in an accessible manner for any required future reference.
If you should have any further questions, please advise.
ry trul yourt)
AM4: DAN / led pc:
- 0. W. Dixon, Jr./T. C. Nichols, Jr.
W. T. Frady E. H. Crews, Jr.
C. L. Ligon (NSRC)
E. C. Roberts R. M.-Campbell R. M. Campbell K. E' Nodland J. G. Connelly, Jr.
R. A. Stough W. A. Williams, Jr.
G. O. Percival Group Managers R. L. Presatte~
- 0. S. Bradham I&E Washington J. B. Knots, Jr.
NPCF
- 0. R. Moore File C. A. Price
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