ML20237F633
| ML20237F633 | |
| Person / Time | |
|---|---|
| Site: | Byron  |
| Issue date: | 08/07/1987 |
| From: | Ainger K COMMONWEALTH EDISON CO. |
| To: | NRC OFFICE OF ADMINISTRATION & RESOURCES MANAGEMENT (ARM) |
| References | |
| 3432K, NUDOCS 8708130106 | |
| Download: ML20237F633 (6) | |
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Commonwealth Edison
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Addriss Reply to: Poot Office Box 767 i
v Chicago, Illinois 60690 - 0767 August 7, 1987 U.S. Nuclear Regulatory Commission Attn: Document Control Desk Washington, DC 20555
Subject:
Byron Station Unit 1 Rod Swap Technique NRC Docket No. 50-454 Reference (1): September 9, 1986 letter from V.S. Noonan to D.L. Farrar Gentlemen:
Reference (1) approved the use of the rod swap technique to perform control rod worth measurements at Byron and Braidwood Stations. Attachment A of this letter contains a report outlining the calculations used to perform the rod worth measurements, as well as a comparison of the measured and predicted rod worths for Byron Unit 1 Cycle 2, The results of this testing show that all safety and design acceptance criteria were met.
Please direct any questions regarding this matter to this office.
Very truly yours, Ca K. A, Ainger Nuclear Licensing Administrator i
Attachment cc: NRC Region III Office Byron Resident Inspector
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8700130106 870B07 PDR ADOCK 05000454 P
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9 ATTAQOENT A Byron Unit 1, Cycle 2 Zero Power Physics Testing Rod Worth Measurement Results The purpose of this test was to determine the differential and integral worth of the reference bank over its entire travel in an unrodded core and to determine the integral worths of the remaining banks using the rod exchange method. Adequate shutdown margin exists based on the rod worth measurements meeting the required acceptance criteria.-
The rod exenange technique required calculations by Nuclear Fuel Services (Reference 2) providing estimated critical positions of the reference bank after exchange with the bank being measured, h, and the associated correction factors, E The measurements were g
obtained for three reference bank positions; Initially fully inserted position;n{h )f"
- 1 a) b) Critical position after exchange, h c) Final fully inserted position, (h )
- The worth of a measured bank,
,isi Wf =
- (AP) a (Ap )
where:
1)
= The total measured worth of the reference bank.
2)
(AP ), = The reference bank worth from 0 steps to the Initial average of (h )o and (h )o* "#".
x x
3)
(API2 x = The reference bank worth from h to 228 steps.
- 4) e, = A correction factor for the h worth due to the rodded geometry.
(1517M/0180M)
4 Rod worth measurements were performed under the guidance of Westinghouse Rod Exchange topical (Reference 3).
The document states that the allowable percent difference between measured and predicted reference bank worth is 10%,15% for individual rod banka and 10% for the sum of l
0 all measured rod banks. For individual banks with a predicted worth lessthan600pcmthelallowabledifferenceis100pcmratherthan15%.
l The reference bank (SBB) was measured by boration and dilution. The percent difference between the predicted worth and the measured worth by dilution and boration of SBB was determined to be -4.3% and -3.7%,
l respectively, which-are both well within the allowable limits as stated l
above. The results of the rod worth measurements are shown'in Tables 1 and 2.
Table 1 is the measured rod worths based on the l
~
dilution measurement of SBB and Table 2 is the measured rod worths based i
on the boration measurement of SBB.
I Using the rod exchange technique, all control and shutdown banks were exchanged with SBB. The largest difference between a measured and predicted rod worth was based on the rod exchange results using the boration data of-SEB and was -15.8% for Shutdown Bank A.
Since the predicted worth of SBB was 299 pcm (< 600 pcm) the allowable worth difference was 100 pcm. Themeasuredtotalworthof[allbanks,basedon the average of dilution and borar. ion measurements of QBB, was 4886.9 pcm which differs by -7.7% from the predicted worth. A11' safety and design acceptance criteria were met.
(1517M/0180M)
REFERENCES 1.
NRC letter V.S. Noonan to D.L. Farrar, dated September 9,1986..
SUBJECT:
- Bypon/Braidwood Rod Swap Technique 2.
' CECO memorand,um No. 87.9709.
B.B. Palagi to R.C. Ward, dated May 5, 1987.
SUBJECT:
Byron 1, Cycle 2 Rod Exchange Revision 3.
WCAP-9863-A, " Rod Bank Worth Measurements Utilizing Bank Exchange",
dated May, 1982.
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