ML20027A104
| ML20027A104 | |
| Person / Time | |
|---|---|
| Site: | Yankee Rowe |
| Issue date: | 10/04/1978 |
| From: | Johnson W YANKEE ATOMIC ELECTRIC CO. |
| To: | Office of Nuclear Reactor Regulation |
| References | |
| WYR-78-85, NUDOCS 7810110163 | |
| Download: ML20027A104 (7) | |
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Telephone 617 366-9011 rwx 710 390-0739 B.l.l.3 YANKEE ATOMIC E!.ECTRIC COMPANY PC 155-7
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20 TurnpikiRoad Westborough, Massachusetts 01581
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,YAuxne WrR 78-85 October 4, 1978 United States Nuclear Regulatory Cor: mission Washington, D. C.
20555 Attention: Office of Nuclear Reactor Regulation
References:
(a) License No. DPR-3 (Docket No. 50-29)
(b) Proposed Change No.155, Supplement No.1 dated December 14, 1977, WYR 77-127 (c) USNRC - YAEC Telecon on September 8,1978
Dear Sir:
Subject:
Additional Information Package No. 4, Incore Detector System Technical Specification Changes In response to your request, Reference (c), for additional infor-mation, enclosed herein as Attachment I is a commitment to construct a core map from a video tape of the as-loaded core, and quadrant tilts based on between 17 and 12 available thimbles.
Any further questions regarding the enclosure should be directed to Mr. Richard J. Cacciapouti at our Engineering Office, 20 Turnpike Road, Westboro, Massachusetts, 01581, (617) 366-9011, Extension 2807.
Very truly yours, YANKEE ATOMIC ELECTRIC COMPANY
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W. P.' Johnson RJC/em Vice President Enclost COMM0!NEALTH OF MASSACHUSETTS)
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COUNTY OF WORCESTER
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Then personally appeared before me, W. P. Johnson, who being duly sworn did state that he is Vice President of Yankee Atomic Electric Company, that he is duly authorized to execute and file the foregoing request in the name and on the behalf of Yankee Atomic Electric Company and that the LPDR stateuents therein are true to the best of his knowlea e and belief-s
$ Id.f 1 A $ 1 h 3 b
Robert H. Groce Notary Public Co=nission Expires September 14, 1984 f D N O D Od Y % -G 41.$
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AIIACEMENI 1
ADDITIONAL INFORMATION CONCERNING REDUCTION OF INCORE NEUTRON DETECTOR THIMBLES AT YANKEE ROWE 1.
In response to the question regarding the construction of a core map from the video tape of the core, Yankee takes the following position:
Yankee Rowe has never experienced an error in fuel loading during the course of fourteen loadings of the core. This is the result of stringent administrative procedures and controls and video tape verifications.
In addition to this, the fact that the Yankee Rowe fuel consists of two physically distinct shapes, decreases the possibility of loading errors even further.
In spite of the above, Yankee recognizes the possibility, however remote, of misloading fuel. Hence Yankee will commit to creating a video tape of the as-loaded' core and constructing a map from that tape.
This will be done by an individual who was independent of the taping.
2.
In References (d), (e) and (f) maximum LHGR and comparisons of measured and theoretical signals were submitted for the reduced compliment of detectors for various times in Cores XII and XIII. Tilt comparisons were only submitted for one case study. For the remaining case studies, a ecmparison of the relative quadrant tilt with the reduced compliment of detectors is given in Tables 1 through 5.
As with the previous data, the relative quadrant tilt is not adversely affected by a reduction in the number of thimbles from 17 to 12.
Based on these results, and those in Reference (d), the use of the INCORE tilt algorithm to monitor core tilt is still valid with a reduced compliment of detectors.
N ba
i Table 1 Comparison of Relative Quadrant Tilt Between 17 and 12 Available Thimbles INCORE RUN YR-XIII-04 408 5'D/MTU Case Quadrant 1 Quadrant 2 Base
- 1.0030 0.9826 1
1.0011 0.9850 2
1.0007 0.0846 3
0.9993 0.9832 4
1.0018 0.9834-5 1.0048 0.9805 6
1,0038 0.9822 7
1,0051 0.9798
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8 1,0077 0,9788 9
0.9981 0.9730 10 1.0042
'0.9790 Quadrant 3.
Quadrant 4 Base 1.0146 0.9998 1
1,0133 1.0006 2
1.0154 0.9993 3
1,0196 0.9979 4
1.0172 0.9976 5
1.0153 0.9994 6
1.0190 0.9950 7
1.0154 0.9997 8
1.0136 0.9998 9
1.0114 1.0175 10 1.0170 0.9998
- Base contains 17 thimbles, all other cases contain 12 thimbles.
Table 2 Comparison ol Relative Quadrant Tilt Between 17 and 12 Available Thimbles INCORE RUN YR-XIII-ll 6530 MWD /MTU Case Quadrant 1 Quadrant 2 Base
- 1.0007 0.9999 1
1.0003 0.9981 2
1.0014 0.9992 3
1.0007 0.9985 4
0.9984 1.0046 5
1.0020 0.9961 6
1.0026 1.0005 7
1.0072 0.9949 8
1.0055 0.9950 9
0.9961 0.9889 10 1.0037 0.9982 Quadrant 3 Quadrant 4 Base 0.9950 1.0044 1
0.9994 1.0021 2
0.9955 1.0040 N
3 0.9974 1.0034 4
0.9931 1.0039 5
0.9980 1.0040 6
0.9979 0.9990 7
0.9957 1.0022 8
0.9960 1.0035 9
0.9924 1.0226 10 0.9994 0.9986
- Bese contains 17 thimbles, all other cases contain 12 thtmbles.
Table 3 Comparison of Relative Quadrant Tilt Between 17 and 12 Available Thimbles INCORE RUN YR-XII-10 1020 MiiD/MTU Case Quadrant 1 Quadrant 2 Base
- 1.0011 0.9931 1
0.9973 0.9981 2
0.9959 0.9967 s
3 0.9930 0.9938 4
0.9982 0.9936 5
1.0053 0.9872 6
0.9991 0.9906 7
0.9994 0.9907
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8 1.0046 0.9887 9
0.9986 0.9896 16 1.0003 0.9920 Quadrant 3 Quadrant 4 Base
-1.0040 1.0018
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1 1.0001 1.0046 2
1.0033 1.0040 3
1.0121 1.0011 4
1.0069 1.0013 5
1.0082 0.9993 6
1.0111 0.9992 7
1.0095 1.0004 8
1.0050 1.0018 9
1.0052 1.0066 10 1.0034 1.0043
- Base contains 17 thimbles, all other cases contain 12 thimbles.
i
-. 1 Table 4
- Comparison of. Relative Quadrant Tilt Between 17 and 12 Available Thimbles INCORE RUN YR-XII-16
~5991 MWD /MTU Case Quadrant 1 Quadrant 2 Base
- 1.0093 1.0016 1
1.0098 0.9980' 2
1,0095 0.9977 3
1.0074' O.9957 4
'l.0211
.1.0017-5 o,9999 0.9937 6
1.0134 1.0013 7
1.0075 1.0043
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8 1.0090 0.9933 9
1.0030 1.0058 10
.1.0103 1.0115' Quadrant 3 Quadrant 4-Base 0.9755 1.0135 1
0.9797 1.0125
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2 0.9741 1.0187 3
0.9803 1.0167 4
0.9712 1.0060 5
0.9821 1.0243 6
0.9839 1.0014 i
7 0.9693 1.0189 8
0.9706 1.0270 9
0.9735 1.0178 I
10 0.9673 1.0109
- Base contains 17 thimbles, all other cases contain 12 thimbles.
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Table 5 Comparison of Relative Quadrant Tilt Between 17-and 12 Available Thimbles INCORE RUN YR-XII-23~
9581 MWD /MTU Case Quadrant 1 Quadrant 2
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Base
- 1.000 1.0015 1
0.9978-0.9993 2
0.9974 0.9988 3
0.9978 0.9992 4
0.9976 l'0066 5
1.0029 0.9944 6
1.0025 1.0027 7
1.0081 0.9964 8
1.0048 0.9929 9
0.9972 0.9973
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0.9994 1.0015 10 Quadrant 3 Quadrant 4 Base 0.9924 1.0060 1
0.9981 1.0048 2
0.9957 1.0080 N
3 0.9945 1.0084 4
0.9890 1.0069 5
0.9944 1.0083 6
0.9964 0.9984 7
0.9923 1.0033 8
0.9956 1.0067 9
0.9893 1.0162
,10 0.9931 1.0060
- Base contains 17 thimbles, all other cases contain 12 thimbles.