ML19209A804
| ML19209A804 | |
| Person / Time | |
|---|---|
| Site: | Dresden  |
| Issue date: | 09/25/1979 |
| From: | COMMONWEALTH EDISON CO. |
| To: | |
| Shared Package | |
| ML17174A048 | List: |
| References | |
| NUDOCS 7910050421 | |
| Download: ML19209A804 (3) | |
Text
.
DRESDEN UNIT 2 Startup Test No. 4 Initial Criticality Comparison PURPOSE The purpose of this procedure is to perform a critical eigenvalue comparison. This is done by comparing tS predicted critical control rod pattern to the actual critical control rod pattern and accounting for period and temperature coefficient corrections.
CRITERIA The actual cold critical rod pattern should be within 1%AK of the predicted control rod pattern. If the difference is greater than + 1%
AK, General Electric and Commonwealth Edison Company core management engineers will be promptly contacted to investigate the anomaly.
RESULTS The t' nit 2 initial critical occurred on May 1,1979 at 7:15 p.m.
on the B requence. The moderator temperature was 148'F and the period vas 68 seconds. The General Electric predic. ions and rod worths were performed using the PANACEA code, which assumed a 68 F moderator.
When corrected for temperature and period, the actual critical was within 1%AK of the predicted critical. Table 4-1 summari.:es the results, 1126 317 7910050 Y f-4i
TIP SYMMETRY - GROSS CllECK Table 3.1 TIP Pair
% Deviation on 5-15-79
% Deviation on 6-21-79 1
2.23 19.39 2
12.14 12.3 3
19.69 19.99 4
3.47 1.67 5
15.47 12.15 6
2.80 1.71 7
2.63 6.05 8
4.09 4.33 9
3.57 4.89 10 5.19 10.30 11 7.10 9.66 12 1.87 3.60 13 3.43 1.64 14 9.12 10.81 15 1.61 4.47 16 5.76 2.58 17 6.34 8.26 18 15.14 15.43 Average:
6.76 8.29 SYMMETRIC TIP LOCATIONS TIP PAIR
_ LP_RM_
10 16-09 32-25 08-25 24-41 2
24-09 11 40-25 08-33 24-49 3
32-09 12 48-15 08-41 24-57 4
40-19 13 56-25 08-49 32-41 5
48-09 I4 40-33 16-25 32-49 6
24-17 15 48-33 16-33 32-57 7
32-17 16 56-33 16-41 40-49 8
I7 40-17 48-41 16-49 40-57 9
18 56-41 48-17 b
b
TABLE 4-1 CRITICAL EICENVALUE CALCULATIONS Data K,
Source Keff with all rods in
.9475
- 1 o inserted by Group 1 rods
.0364 AKeff
- 1 o inserted by Group 2 rods withdrawn
.0198 AKef f
- 1 at criticality Panacea Keff Critical Rod Pattern at O't 1.003 Temperature Correction between 68 F and 15Y
.00264AK MTC of -3. 3 x 10-5 og gp "F
K Panacea Keff at critical Rod Pattern corrected for Temperature 1.0010f Keff at time of Critical with
= period 1.000 Period correction for 68 sec period
+.000766K
- 3 Actual Kef f with 68 sec period
[1. 0007f Difforence
.00036K (Panacea Keff - Actual Keff)
.03%AK Data Sources Used in Calculations
- 1. GE letter, A.
F.
Do ita to T J,
3auaeh dated May 21, 1979.
- 2. Actual !!oderator Tomp. Coorf detornined noc 6 on cite.
- 3.
g vs. T tables 1126 319
(($ [k1b