ML20100J156
| ML20100J156 | |
| Person / Time | |
|---|---|
| Site: | Prairie Island  |
| Issue date: | 11/29/1984 |
| From: | Musolf D NORTHERN STATES POWER CO. |
| To: | Office of Nuclear Reactor Regulation |
| References | |
| NUDOCS 8412100234 | |
| Download: ML20100J156 (3) | |
Text
r 4
Northem States Power Company 414 Ncollet Matt Minneapoks. Minnesota 55401 Telephone (612) 330 5500 November 29, 1984 Director Office of Nuclear Reactor Regulation U S Nuclear Regulatory Commission Washington, DC 20555 PRAIRIE ISLAND NUCLEAR GENERATING PLANT Docket Nos. 50-282 License Nos. DPR-42 50-306 DPR-60 Rod Swap Results We have completed physics testing of Unit 2, Cycle 9 using rod swap methodology approved by your October 24, 1984 letter. All acceptance criterian, including those stated in the October 24, 1984 letter, were met; the results are attached.
The results of the next Unit i use of the rod swap technique will be sub-
.mitted per the October 24, 1984 letter.
%: o w David Musolf Manager-Nuclear Support Serv 4 es DMM/TMP/ dab c: Regional Administrator-III, NRC NRR Project Manager, NRC Resident Inspector, NRC G Charnoff I
t
'\\
8412100234 841129 PDR ADOCK 05000306 P
PDR I
r Y
a Prairie Island Unit 2 Cycle 9 Rod Swap Results This report includes the data taken during the control rod reactivity measurements of "rairie Island Unit 2 Cycle 9 using the rod swap tech-nique as presented in NSP topical report NSPNAD-8408 " Prairie Island Units 1 and 2 Rod Swap Methodology". The following page includes a table comparing the plant measured data for.PI 2 Cycle 9 with'the predictions presented in NSP report NSPNAD-8407P " Prairie Island Unit 2 Cycle 9 Startup & Operations Report".
All corrections presented in the rod swap topical report were taken into account i the rod swap measurements. The boron level did n7t deviate by more than the titration error during the test, therefore no boron correc-tions were needed. The data recorded for the reference bank (A bank) in, all other rods out condition at the beginning and the end of the test '
verified that no reactivity change attributable to a change:in boron had-occurred.
From the following table it can be seen that the error in the reference bank worth of -9.9% is very close to the 110% criteria.
NSP originally planned to use a 115% acceptance criteria. After discus-sion with the NRC we agreed to use !10%. We are currently reviewing the 110% criteria and plan to discuss the use of a larger acceptance criteria with you.
l b
r
' Prairie Island Unit 2 Cycle 9 Rod Swap Rod Swap Technique Control Worth (pcm)
Review Rod Bank Measured Predicted A(pcm)
A(%)
Criteria (%)
A 1283 1424'
-141
-9.9 10 (reference bank)
B 587 519 68 13.1 15 C
1020 977 43 4.4 15 0
711' 671 40 6.0 15 SA 619 637
-18
-2.8 t15 58 624 637
-13
-2.0 t15-Total 4844 4865
-21
-0.4
- 10 Mean =- 1.5%
o = 8.0%
t i
e l
- - - -. -. -,,.. - -..... -...