ML20059F687
| ML20059F687 | |
| Person / Time | |
|---|---|
| Site: | Vogtle  |
| Issue date: | 01/07/1994 |
| From: | Mccoy C GEORGIA POWER CO. |
| To: | NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM) |
| References | |
| LCV-0210, LCV-210, TAC-M80515, TAC-M80516, NUDOCS 9401140120 | |
| Download: ML20059F687 (12) | |
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January 7, 1994 LCV-0210 Docket Nos. 50-424 50-425 TAC Nos. M80515 M80516 U. S. Nuclear Regulatory Commission ATTN: Document Control Desk Washington, D. C. 20555 Gentlemen:
VOGTLE ELECTRIC GENERATING PLANT DIFFERENTI AL SETTLEMENT OF BURIED PIPE ADDITIONAL INFORMATION The August 23,1991, letter from the NRC to Mr. W. G, Hairston, III transmitted the Safety Evaluation Report (SER) regarding the VEGP settlement monitoring program. In section 2.4 of the SER, " Differential Settlement of Buried Pipe," the staff questioned the validity of the piping analyses. A January 8,1993, letter from Mr. C. K. McCoy to the NRC responded to the SER concern regarding the validity of the piping analyses by reporting the evaluation of all safety related buried piping.
During an August 12,1993, telephone conference to discuss this submitted evaluation data, the staff reguested additional survey data for the marker numbers 132-R,145-R, 196, 249-R,252-R,260-R and 292. These were provided as shown in Enclosure 1.
On October 25,1993, a follow-up telephone conference was held during which further questions were asked by the staff. Enclosure 2 is our responses to these questions:
Should you have any additional questions, please inquire.
Sincerel,
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U. S. Nucle.ar Regulatory Commission Page 2 cc: Osorgia Power Company Mr. J. B. Beasley, Jr Mr. M. Sheibani NORMS U. S. Nucitadegulatory Commini2D Mr. S. D. Ebneter, Regional Administrator Mr. D. S. IIood, Licensing Project Manager, NRR Mr. B. R. Bonser, Senior Resident Inspector, Vogtle I
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ENCLOSURE 2 i
(1 ) QUESTION:
What is the allowable survey error for Marker 2607 ANSWER:
There is not an " allowable survey error" for, or at, a particular marker. The allowable error for the closure of each survey run associated with marker 260 is calculated in accordance with NOAA Manual NOS NGS 3. This may vary and is dependent on several factors such as the distance of the run (out and back) to the marker.
(2) QUESTION:
What is the explanation for the apparent upward movement of the structure by 0.004 R (+0.05 inch) ?
ANSWER:
The positive numbers (+0.004' etc.) shown in the " CHANGE" column (the middle column on the data list) is not an indication that the building has any upward movement. This is only an indication of the difference in the elevation established by the current survey and that of the preceding survey.
ARer completion of a survey for each marker and the current elevation reading is established, the surveyors calculate this " CHANGE" only as an indicator that the current elevation reading is reasonable. If this were to be an unusual or questionable number, it would indicate a mistake on the part of the survey party who would conduct another run for that marker.
(3) QUESTION:
What is the basis for the survey tolerance limit?
ANSWER:
NOAA Manual NOS NGS 3, Chapter 3, Table 3-1 is the basis for the tolerances on surveying as required by GPC Procedure 84301-C, " Monitoring Settlement of Major Stmetures"
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LCV-0210 J
t ENCLOSURE 2 (CONTINUED)
(4) QUESTION:
llow far away is the permanent benchmark that was used in surveying the Marker 2607 ANSWER:
Refer to UFS AR figure 1.1-1, Location and Vicinity Map, for the location of the two permanent benchmarks (BM #1 at N80+00; E139+00 and BM #2 at N80+00; E50+00).
Refer to UFSAR figure 1.2.2-1, sheet 1, Site Plan, for the location of the two control monuments (CM #1 at N84+00, E85+00 and CM #2 at N71+00; E105+00).
The latest survey run for marker 260 had an approximate distance of 1400 feet from CM #1 to marker 260.
(5) QUESTION:
What were the allowable and actual closing survey errors for the days when positive (upward) movements of +0.003 and 40.004 f1 are indicated for the Marker 2607 ANSWER:
The following table is the requested data on some selected days when the "CIIANGE" was indicated as positive (in relation to the previous reading) i.e. +0.004, +0.005 and +0.004, respectively.
DATE RUN IN RUN OUT ELIiLD_.
ALLOWABLE ERROR ERROR 7-31-90
-1.10230'
+1.10275' 40.0005' 10.0068 9-28-92
-1.10195'
+1.10355' 40.0016' 10.0068 1-19-93
-1.10750'
+ 1.10635'
-0.0012' 10.0068 LCV-0210