ML20100J156

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Forwards Completed Physics Testing Results of Cycle 9 Using Rod Swap Methodology Approved by .Results of Next Unit 1 Use of Rod Swap Technique Will Be Submitted Per
ML20100J156
Person / Time
Site: Prairie Island Xcel Energy icon.png
Issue date: 11/29/1984
From: Musolf D
NORTHERN STATES POWER CO.
To:
Office of Nuclear Reactor Regulation
References
NUDOCS 8412100234
Download: ML20100J156 (3)


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> 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

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r a Y 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.

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' 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%

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