ML20086T373
| ML20086T373 | |
| Person / Time | |
|---|---|
| Site: | Rhode Island Atomic Energy Commission |
| Issue date: | 07/27/1995 |
| From: | Tehan T RHODE ISLAND, STATE OF |
| To: | Mendonca M NRC (Affiliation Not Assigned) |
| References | |
| NUDOCS 9508020332 | |
| Download: ML20086T373 (22) | |
Text
.
l STATE OF RHODE ISLAND AND PROVIDENCE PLANTATIONS i
Rhode Island Atomic Energy Commission NUCLEAR SCIENCE CENTER
[
South Ferry Road Narragansett, R.I. 02882 1197 l
July 27, 1995 f
i Docket No. 50-193 Mr. Marvin Mendonca, Senior Project Manager Non-Power Reactors, Decommissioning and Environmental Project Directorate Division of Reactor Projects - III/IV/V U.
S. Nuclear Regulatory Commission (NRC) l Washington, DC 20555
Dear Mr. Mendonca:
This letter and enclosures constitute the first annual report that is required by revision one to the Technical f
Specifications. Enclosure 1 provides reactor operating i
statistics. Enclosure 2 provides information on the 1
)
emergency shutdown. discusses maintenance operations. Enclosure 4 describes changes to the facility and enclosure E provides radiological controls information.
If there are ( ay questions regarding this information, please call me at 401-789-9391.
l Sincerely,
]
'Ju Terry an D1 r
TT:cd Enclosures (5)
Copy to:
T. Dragoun, Region One 02C053 9500020332 950727 r
PDR ADOCK 05000193
.I R
'((
ENCLOSURE 1 In 'accordance with Technical Specifications, section 6.8.4.a.:
The following pages provide a monthly summary for the i
period July 1, 1994 to June 30, 1995. Tabulating the energy generated by the reactor (in megawatt hours), the number of hours the reactor was critical, and the cumulative total energy output since indtial criticality.
dI i
1 e
[
t I
OPERATING STATISTICS JULY 1,1994 TO JUNE 30,1995 i
l EXPERIMENTERj, _ _ _ ___.
i l
BEAM PORTS IRRADIATIONS I SAMPLES !SUB. TOTAL HOURS 8
1 4
8 7
12 8
4 f
4
-..._..____.g_
24 2
22 i
...__-.-_-.__....-__-.---..._..m.._
117 12 37 12 37 45 71 277
~ ~
~
.5.
.... - ~..
4
'48 186 45 57 1
__.210
..193... -.
..4....
45 560 1
,,, _ [_[, }_],' ][__, _ _ n, ~
~
~
.. 5[
103
._ _ 3 45 37 200
~
45
_. _. [;
~
~'
~
_ j77. ((,[djU 1354 4811 45 188 i
822 e
m w
4
~
l'RRADI TION 5I 'S MdES'~
HOU'RS TOTALS 1419 5028 1419' ' 5'028" 859.88
~
l
d l
I Monthly Information Sheet l Month:
Jun-95 l
l Revised 5/18/95 l Cumulative MWH's l
Start:
3395.76 l
l End:
3484.91 l i
Run Ave Power Start S/D Operating Todays Stack Stack No.
Day Level Time Time Time total Monitor
% EC (MW)
(Hrs)
MWHs maxCPM neteased 6803 1
1.64 0911 1600 6.82 11.18 15,000 3.5%
i 6804 2
1.65 1001 1600 5.98 9.87 15,000 3.1 %
6805 13 1.75 0952 1600 6.13 16.73 16,000 3.3 %
l 6806 14 1.70 0913 1600 6.78 11.53 15,000 3.5%
6807 15 1.65 0905 1600 6.92 11.41 15,000 3.5%
e 6808 16 1.65 0916 1600 6.73 11.11 15,000 3.4 %
6809 19 1.70 0857 1600 7.05 11.99 16.000 3.8%
[
i 6810 20 1.65 0908 1600 6.87 11.33 16.000 3.7 %
t i
s i
t Totals:
53.28 89.15
SUMMARY
Max.
Actual Max.
Actual Operating Hours:
154 53.28 M W H's:
308.00 89.15 Operating Percent:
35%
29 %
i I
_ ~ _
Monthly information Sheet l Month:
May-95 l
l Revised 5/18/95 l Cumulative MWH's l
Start:
3178.04 l
l End:
3395.76 l Run Ave Power Start S/D Operating Todays Stack Stack No.
Day Level Time Time Time total Monitor
% EC (MW)
(Hrs)
MWHs max CPM neieased 6782 1
1.80 1100 1600 5.00 9.00 16.000 2.7%
6783 2
1.75 0913 1600 6.78 11.87 15,000 3.5 %
6784 3
1.65 0917 1537 6.33 10.45 15,000 3.2 %
6785 4
1.65 0859 1600 7.02 11.58 15,000 3.6%
6786 5
1.65 0856 1600 7.07 11.66 15,000 3.6%
6787 8
1.60 0907 1400 4.88 7.81 15,000 2.5%
6788 10 1.75 0913 1605 6.37 11.14 16,000 3.5%
6789 11 1.60 0911 1600 6.82 10.91 16,000 3.7 %
6790 12 1.60 0950 1600 6.17 9.87 15,000 3.2%
6791 15 1.75 0917 1425 5.13 8.98 16,000 2.8%
6792 16 1.70 0922 1600 6.63 11.28 16,000 3.6%
6793 17 1.60 0909 1600 6.85 10.96 15,000 3.5 %
6794 18 1.60 0943 1600 6.28 10.05 14,000 30%
6795 19 1.60 0928 1600 6.53 10.45 14,000 3.1 %
I 6796 22 1.70 0919 1600 6.68 11.36 15.000 3.4 %
6797 23 1.65 0920 1530 6.17 10.18 15,000 3.2 %
6798 24 1.61 0917 1430 5.22 8.40 15,000 2.7 %
6799 25 1.70 0915 1600 6.75 11.48 15,000 3.5%
6800 26 1.70 1013 1600 5.78 9.83 16,000 3.2 %
i 6801 30 1.73 1100 1600 5.00 8.65 15.000 2.6 %
6802 31 1.70 0903 1600 6.95 11.82 15,000 3.6%
l Totals:
130.42 217.72 i
SUMMARY
Max.
Actual Max.
Actual Operating Hours:
154 130.42 M W H's:
308.00 217.72 l
Operating Percent:
85%
71 %
l l
l
Monthly Information Sheet l Month:
Apr-95 l
l Rev.
7/12/94 l Cumulative MWH's l
Start:
3068.23 l
l Ending:
3178.04 l Run Ave Power Start S/D Operating Todays Stack Stack No.
Day Level Time Time Time total Monitor
% EC (MW)
(Hrs)
MWHs max CPM neieased 6772 3
1.70 1005 1600 5.92 10.06 15,000 3.0%
6773 4
1.70 0932 1600 6.47 10.99 15,000 3.3 %
6774 6
1.75 0909 1551 6.70 11.73 15,000 3.4 %
6775 11 1.75 0912 1600 6.80 11.90 16,000 3.7%
6776 18 1.60 0910 1600 6.83 10.93 15,000 3.5%
6777 20 1.63 0910 1600 6.83 11.14 15,000 3.5%
6778 21 1.55 0909 1600 6.85 10.62 12,000 2.8%
6779 26 1.70 0918 1600 6.70 11.39 16,000 3.7 %
6780 27 1.65 0950 1600 6.17 10.18 15,000 3.2%
6781 28 1.60 0912 1600 6.80 10.88 15,000 3.5%
Totals:
66.07 109.81
SUMMARY
Max.
Actual Max.
Actual Operating Hours 140 66.07 MWH's 280.00 109.81 Operating Percentages:
47 %
39%
l l
l
t Monthly Information Sheet l Month:
Mar-95 l
l Rev.
7/12/94 l Cumulative MWH's l
Start:
2927.62 l
l Ending:
3068.23 l Run Ave Power Start S/D Operating Todays Stack Stack No.
Day Level Time Time Time total Monitor
% EC (MW)
(Hrs)
MWHs max CPM neteased 6760 1
1.80 0911 1600 6.Pc 12.27 16,000 3.7%
6761 3
1.80 0920 1600 6.67 12.00 16,000 3.6%
6762 6
1.80 0922 1600 6.63 11.94 16.000 3.6%
6763 7
1.80 0914 1600 6.77 12.18 16,000 3.7%
G764 8
1.62 0935 1600 6.42 10.40 15,000 3.3%
6765 9
1.78 0929 1600 6.52 11.60 15,000 3.3%
6766 10 1.75 0952 1600 6.13 10.73 15,000 3.1 %
6767 13 1.75 0911 1600 6.82 11.93 16.000 3.7%
6768 14 1.80 0911 1600 6.82 12.27 16,000 3.7 %
6769 16 1.73 0906 1600 6.90 11.94 15,000 3.5%
6770 17 1.70 0915 1600 6.75 11.48 16,000 3.7 %
G771 29 1.80 0924 1600 6.60 11.88 16,000 3.6%
s r
Totals:
79.83 140.61
SUMMARY
Max.
Actual Max.
Actual Operating Hours 140 79.83 MWH's 280.00 140.61 Operating Percentages:
57 %
50%
O
Monthly Information Sheet l Month:
Feb-95 l
l Rev.
7/12/94 l Cumulative MWH's l
Start:
2735.09 l
l Ending:
2880.61 l Run Ave Power Start S/D Operating Todays Stack Stack No.
Day Level Time Time Time total Monitor
% EC (MW)
(Hrs)
MWHs max CPM Released 6741 1
1.75 0928 1600 6.53 11.43 17,000 3.8%
6742 2
1.76 0934 1600 6.43 11.32 17,000 3.7%
6743 3
1.78 0906 1550 6.73 11.99 16,000 3.7 %
6744 6
1.75 0923 1600 6.62 11.58 16,000 3.6%
6745 8
1.75 0900 1600 7.00 12.25 16,000 3.8%
6748 9
1.76 1203 1600 3.95 6.95 17,000 2.3 %
6749 10 1.75 1159 1600 4.02 7.03 16,000 2.2%
6750 13 1.80 0911 1600 6.82 12.27 16,000 3.7%
6751 14 1.80 0911 1600 6.82 12.27 18.000 4.2%
6752 15 1.80 0910 1600 6.83 12.30 18,000 4.2%
6753 16 1.80 0911 1600 6.82 12.27 17.000 4.0%
6754 17 1.75 0911 1600 6.82 11.93 17,000 4.0%
G755 21 1.75 0911 1600 6.82 11.93 15.000 3.5%
Totals:
82.20 145.52
SUMMARY
Max.
Actual Max.
Actual Operating Hours 140 82.20 M W H's 280.00 145.52 Operating Percentages:
59 %
52%
8
~~~
e Monthly Information Sheet l Month:
Jan-95 l
l Rev.
7/12/94 l Cumulative MWH's l
Start:
2538.87 l
l Ending:
2735.09 l Run Ave Power Start S/D Operating Todays Stack Stack No.
Day Level Time Time Time total Monitor
% EC (MW)
(Hrs)
MWHs max CPM Released 6723 3
1.78 0926 1600 6.57 11.69 18,000 4.0%
6724 4
1.80 0913 1600 6.78 12.21 19,000 4.4%
6725 5
1.81 0954 1610 6.27 11.34 16,000 3.4 %
6726 6
1.80 0950 1600 6.17 11.10 19,000 4.0%
6727 10 1.80 0926 1600 6.57 11.82 15,000 3.4 %
6728 11 1.83 0930 1600 6.50 11.90 18,000 4.0%
6729 12 1.80 0915 1600 6.75 12.15 16,000 3.7 %
6730 17 1.80 0905 1400 4.92 8.85 15,000 2.5%
6731 18 1.80 0914 1600 6.77 12.18 18,000 4.2%
6732 19 1.80 0943 1600 6 28 11.31 16,000 3.4 %
6733 20 1.75 0910 1600 6.83 11.96 16,000 3.7%
6734 23 1.70 0916 1600 6.73 11.45 15,000 3.4%
6735 24 1.80 0912 1600 6.80 12.24 18,000 4.2%
6736 25 1.75 0919 1600 6.68 11.70 18,000 4.1 %
6737
\\ 26 1.75 0914 1600 6.77 11.84 16,000 3.7%
6738 30 1.75 0950 1600 6.17 10.79 16,000 3.4 %
6739 31 6740 31 1.80 0930 1600 6.50 11.70 17,000 3.8%
Totals:
110.05 196.22
SUMMARY
Max.
Actual Max.
Actual Operating Hours 140 110.05 M W H's 280.00 196.22 Operating Percentages:i 79 %
70 %
e I
i Monthly information Sheet l Month:
Dec-94 l
l Rev.
7/12/94 l Cumulative MWH's l
Start:
2361.33 l
l Ending:
2538.87 l Run Ave Power Start S/D Operating Todays Stack Stack No.
Day Level Time Time Time total Monitor
% EC (MW)
(Hrs)
MWHs max CPM neieased 6698 1
1.80 0925 1600 6.58 11.85 15,000 3.4 %
6699 2
1.78 0947 1600 6.22 11.07 15,000 3.2%
6700 3
1.83 1306 1600 2.90 5.31 16,000 1.6%
6701 4
1.76 0900 1600 7.00 12.32 15,000 3.6%
6702 7
1.75 0940 1600 6.33 11.08 16,000 3.5 %
6703 9
1.71 0939 1600 6.35 10.86 15,000 3.3 %
6713 12 1.80 0930 1600 6.50 11.70 15.000 3.3%
6714 13 1.80 0915 1600 6.75 12.15 18,000 4.1 %
6715 14 1.80 0924 1600 6.60 11.88 17,000 3.8%
6716 15 1.80 0920 1600 6.67 12.00 18,000 4.1 %
6717 16 1.80 1007 1600 5.88 10.59 18,000 3.6 %
6718 19 1.77 0920 1600 6.67 11.80 17,000 3.9%
6719 20 1.80 0929 1600 6.52 11.73 18,000 4.0%
6720 21 1.80 0916 1600 6.73 12.12 18,000 4.1 %
6721 1 29 1.80 0300 1600 7.00 12.60 18,000 4.3%
6722 30 1.80 0917 1400 4.72 8.49 19,000 3.1 %
~4 Totals:
99.42 177.54
SUMMARY
Max.
Actual Max.
Actual Operating Hours 140 99.42 MWH's 280.00 177.54 Operating Percentages:
71 %
63 %
Monthly Information Sheet i
l Month:
Nov-94 l
l Rev.
7/12/94 l Cumulative MWH's l
Start:
2209.99 l
l Ending:
2361.33 l Run Ave Power Start SID Operating Todays Stack Stack No.
Day Level Time Time Time total Monitor
% EC (MW)
(Hrs)
MWHs max CPM Released 6698 1
1.80 0925 1600 6.58 11.85 15,000 3.4 %
6699 2
1.78 0947 1600 6.22 11.07 15,000 3.2%
l 6700 3
1.83 1306 1600 2.90 5.31 16.000 1.G%
6701 4
1.76 0900 1600 7.00 12.32 15,000 3.6%
6702 7
1.75 0940 1600 6.33 11.08 16.000 3.5%
6703 9
1.71 0939 1600 6.35 10.86 15,000 3.3%
6704 10 0.01 0924 0939 0.25 0.00 500
- 0.0%
6705 10 1.77 1400 1600 2.00 3.54 16,000 1.1 %
6706 15 1.80 0912 1600 6.80 12.24 15,000 3.5 %
6707 16 1.80 0855 1600 7.08 12.75 15,000 3.6%
6708 17 1.80 0859 1600 7.02 12.63 19,000 4.5%
6709 N
18 1.80 0900 1600 7.00 12.60 17,000 4.1 %
6710 21 1.79 0940 1600 6.33 11.34 16,000 3.5%
6711 22 1.80 0859 1600 7.02 12.63 18,000 4.3 %
6712 23 1.79 0947 1600 6.22 11.13 18,000 3.8%
Totals:
85.10 151.34
SUMMARY
Max.
Actual Max.
Actual
- VALUE!
Operating Hours 140 85.10 MWH's 280.00 151.34 Operating Percentages:
61 %
54 %
~
Monthly Information Sheet l Month:
Oct-94 l
l Rev.
7/12/94 l Cumulative MWH's l
Start:
2007.28 l
l Ending:
2209.99 l Run Ave Power Start S/D Operating Todays Stack Stack No.
Day Level Time Time Time total Monitor
% EC (MW)
(Hrs)
MWHs max CPM neleased 6681 3
1.85 0950 1600 6.17 11.41 15,000 3.2%
6682 4
1.80 0910 1600 6.83 12.30 15,000 3.5%
6683 5
1.80 0900 1600 7.00 12.60 15,000 3.6%
6684 6
1.80 0915 1600 6.75 12.15 15,000 3.5%
6685 12 1.75 0917 1600 6.72 11.75 15,000 3.4 %
6686 13 1.76 0912 1600 6.80 11.97 15,000 3.5%
6687 14 1.75 0907 1600 6.88 12.05 16,000 3.8%
6688 17 1.83 0932 1600 6.47 11.80 15,000 3.3%
6689
_ 18 1.80 0929 1600 6.52 11.73 16,000 3.6%
6690 19 1.80 0908 1530 6.37 11.46 15,000 3.3 %
6691 20 1.75 0905 1600 6.92 12.10 15,000 3.5%
1 6692 24 1.80 0923 1600 6.62 11.91 15,000 3.4 %
6693 25 1.80 0859 1600 7.02 12.63 15,000 3.6%
6694 26 1.75 0913 1600 6.78 11.87 15,000 3.5%
6695 27 1.80 0911 1600 6.82 12.27 18,000 4.2%
6696 28 1.80 0911 1545 6.57
- 11.82 18,000 4.0%
6679 31 1.80 0957 1600 6.05 10.89 15,000 3.1 %
Totals:
113.27 202.71
SUMMARY
Max.
Actual Max.
Actual Operating Hours 140 113.27 M W H's 280.00 202.71 Operating Percentages:
81 % s 72 %
e v
~, -
n-,-
++
Monthly information Sheet l Month:
Sep-94 l
l Rev.
7/12/94 l Cumulative MWH's l
Start:
1872.39 l
l Ending:
2007.28 l Run Ave Power Start S/D Operating Todays Stack Stack No.
Day Level Time Time Time total Monitor
% EC (MW)
(Hrs)
MWHs max CPM neleased 6667 1
1.70 0931 1600 6.48 11.0-13,000 2.9 %
6668 9
6669 13 1.60 1018 1600 5.70 9.12 11,000 2.1 %
6670 19 1.65 0917 1600 6.72 11.08 11,000 2.5 %
6671 20 1.68 0850 1600 7.17 12.04 15,000 3.7 %
6672 21 1.67 0908 1600 6.87 11.47 14,000 3.3%
6673 22 1.75 0946 1600 6.23 10.91 15,000 3.2%
6674 23 1.72 0923 1600 6.62 11.38 15,000 3.4 %
6675 26 1.76 0920 1600 6.67 11.73 13,000 3.0%
6676 27 1.78 0900 1600 7.00 12.46 13,000 3.1 %
6677 28 1.80 1000 1600 6.00 10.80 15,000 3.1%
6678 29 1.78 0913 1600 6.78 12.07 15,000 3.5%
6679 30 1.78 0956 1600 6.07 10.80 15,000 3.1 %
s -
e Totals:
78.30 134.89
SUMMARY
Max.
Actual Max.
Actual Operating Hours 154 78.30 M W H's 308.00 134.89 Operating Percentages:
51 %
44 %
Monthly information Sheet l Month:
Aug-94 l
l Rev.
7/12/94 l Cumulative MWH's l
Start:
1634.53 l
l Ending:
1872.39 l Run Ave Power Start S/D Operating Todays Stack Stack No.
Day Level Time Time Time total Monitor
% EC (MW)
(Hrs)
MWHs max CPM Released 6645 1
1.65 0924 1600 6.60 10.89 11,000 2.5%
6646 2
1.60 0919 1600 6.68 10.69 11.000 2.5%
6647 3
1.65 0905 1600 6.92 11.41 11,000 2.6%
6648 4
1.65 0920 1600 6.67 11.00 11,000 2.5%
6649 5
1.60 0915 1600 6.75 10.80 11,000 2.5%
6650 9
1.65 0907 1600 6.88 11.36 11,000 2.6%
6651 10 1.65 0900 1600 7.00 11.55 12,000 2.9%
6652 11 1.65 0918 1600 6.70 11.06 14,000 3.2%
6653 12 1.70 0900 1300 4.00 6.80 12,000 1.6%
6654 15 1.65 1040 1600 5.33 8.80 12,000 2.2%
6655 16 1.70 0900 1600 7.00 11.90 12,000 2.9 %
6656 17 1.65 0929 1600 6.52 10.75 11,000 2.4 %
6657 18 1.65 0917 1600 6.72 11.08 11,000 2.5%
6658 19 1.65 0909 1600 6.85 11.30 11,000 2.6%
6659 22 1.70 0923 1600 6.62 11.25 11,000 2.5%
6660 23 1.65 0900 1600 7.00 11.55 12,000 2.9%
6661 24 1.65 0930 1600 6.50 10.73 12,000 2.7 %
6662 25 1.62 0906 1600 6.90 11.18 12,000 2.8%
6663 26 1.65 0858 1600 7.03 11.61 12,009 2.9 %
6664 29 1.65 0943 1600 6.28 10.37 12,000 2.6%
6665 30 1.60 0858 1600 7.03 11.25 12,000 2.9 %
6666 31 1.60 0925 1600 6.58 10.53 12,000 2.7%
Totals:
144.57 237.86
SUMMARY
Max.
Actual Max.
Actual Operating Hours 154 144.57 M W H's 308.00 237.86 Operating Percentages:
94 %
77 %
Monthly Information Sheet l Month:
Jul-94 l
l Rev.
7/12/94 l Cumulative MWH's l
Start:
1513.30 l
l Ending:
1634.53 l Run Ave Power Start S/D Operating Todays Stack Stack No.
Day Level Time Time Time total Monitor
% EC (MW)
(Hrs)
MWHs max CPM neieased 6631 1
1.70 1001 1600 5.98 10.17 13,000 2.7%
6632 5
1.70 0947 1600 6.22 10.57 12.000 2.5 %
6633 6
1.70 0949 1058 1.15 1.96 11,000 0.4%
6634 6
1.70 1143 1600 4.28 7.28 11,000 1.6%
6635 7
1.65 1009 1600 5.85 9.65 11,000 2.2%
6636 8
1.60 0909 1148 2.65 4.24 11,000 1.0%
6637 8
1.45 1242 1600 3.30 4.79 11,000 1.2%
6638 11 1.55 0904 1600 6.93 10.75 12,000 2.8%
6639 12 1.60 0922 1600 6.63 10.61 13,000 2.9%
6640 13 1.50 0905 1600 6.92 10.38 10.000 2.4 %
6641 19 1.55 0918 1600 6.70 10.39 10,000 2.3%
6642 20 1.40 0918 1600 6.70 9.38 10,000 2.3 %
6643 26 1.65 0920 1600 6.67 11.00 10,000 2.3 %
s 6644 28 1.60 0927 1545 6.30 10.08 10,000 2.1 %
l Totals:
76.28 121.23
SUMMARY
Max.
Actual Max.
Actual Operating Hours 140 76.28 M W H's 280.00 121.23 Operating Percentages:
54 %
43%
ENCIOSURE 2 EMERGENCY SHUTDOWNS AND INADVERTENT SCRAMS The following are the number of emergency shutdowns and inadvertent scrams, including the reasons in accordance with Technical Specifications, section 6,8.4.b.:
DATE RUN NO.
LOGBOOK /PAGE REASON 10/3/94 6680 43/145 Wide Range Linear Channel #1 Hi-Power scram due to auto-ranging malfunction which selected a lower range while raising reactor power level during a startup.
1 I
s es
ENCLOSURE 3 Enclosure 3-Maintenance Operations A radioactive waste water filter system was installed this month. As a result of this installation, all waste water is filtered through a one micron filter before discharge. The Emergency Core Cooling System installation is in progress. All mechanical components are in place. The electrical system installation and testing are the only remaining items to complete the installation. The water softener on the make up system has developed pin hole leaks due to age. The liner has been broached and the steel tank began to leak in two locations. Rubber gaskets and steel bolts were used to make temporary repairs. At some point, the water softener will require replacement.
The reactor pool leak has increased during the past two years from 1-2 liters a day to 5 gallons a day and is now 25 gallons a day. The leak water is collected in drain lines and pumped to a holding tank. After sampling, this water is discharged. Most of the leakage comes from the area below j
the thermal column door on the main reactor floor level.
This leakage source had not been present for a few years, but has reappeared recently. The most probable source of the leakage is from cooling tubes that are welded to the pool liner and make a u-shape into the concrete. This item is the top priority for funding under the Department of Energy Grant Program.
A 15,000 gallon holding tank was placed out of commission after it developed a leak at the welded joint of the suction pipe. This underground tank is thirty years old and a state building engineer judged it to be not worth repairing. Efforts are underway to procure a new plastic
)
tank which will be installed inside the facility.
All HEU fuel has been removed from the facility. The contract for additional cooling and pumping capacity to upgrade the reactor to 5 Megawatts has been awarded and work will start this month.
a ENCLOSURE 4 The following are descriptions of 10 CFR 50.59 evaluations conducted during the period covered by this report in accordance with Technical Specifications, section 6.8.4.d.:
1.
3-16-94, Replace steel through-tube cover flange with a PVC flange.
The use of a PVC flange is to decrease the weight of the flange during the increased handling of the flanges by staff personnel while using the through-tube to conduct irradiations. The flange is used as a barrier to prevent pool leakage in the event of a rupture along the through tube penetration in the pool. It must be capable of withstanding a force of at least 15 psi static pressure in the case of a guillotine break of the through tube.
The flange must also be able to hold back the resulting surge pressure from the water rushing to the end of the tube ( i. e.' water hammer effect). Calculations showed that a PVC flange with a one inch thickness is sufficient as a replacement. The change to a PVC flange for use in the through-tube did not require a change in the Technical Specifications nor create an unresolved safety question.
2.
7-19-94, Replace the Primary Temperature monitorina system.
The primary temperature monitoring system consisted of RTD temperature probes, amplifier with recorder and alarm outputs. The temperature monitoring replacement provides for better resolution and accuracy than the old (30 years) system. Reliability and serviceability should be better with a single unit (A/D, digital readout) compared to the multi-unit design
( resistance-to-current converter, alarm module, power supply, and recorder). The digital readout provides for a more accurate indication and adjustment of alarm and scram set points. The new system pgovides automatic self-calibration; testing for open/ shorted sensor and including fail-safe modes. It interfaces with existing alarm and scram circuits using relay contacts similar to the original. system requiring no changes to electrical schematics.
The change to a digital panel meter for the primary system temperature system does not involve a change to the Technical Specifications nor a change in any Safety Analysis Report descriptions.
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9-9-94, Relocating 6 beryllium reflectors in the core 2 configuration outward and moving graphite reflectors in toward the core to reduce core reactivity.
The four (4) control (shim / safety) blades span almost the full width of the core. Each blade has a reactivity worth of approximately 3%. Control blade stroke is 26 inches ( 0" - full in, 26" - full out ).
Power fluctuations occur when control blade heights are below 18 inches of travel. The play between the blade and its shroud allows the blade to move from side to side, as cooling water flows around the blade, changing the neutron flux seen by the linear power range detectors. This causes an approximate iS% change in the indicated power level.
Power level detectors are suspended in adjacent core supports above the active core which causes shadowing of detectors when the control blades are below the 18 inch level.
This fluctuation is amplified by the automatic servo control system attempting to maintain reactor power within 2%.
The change to core #2 in accordance with the SAR to regain additional reactivity lost due to burnup after an initial operation with the startup core configuration provided a core excess reactivity requiring control blades to be below the 18 inch level.
The exchange of reflector positions within the reactor core provided just enough reactivity loss to cause the compensating control blade heights to be above 18
- inches, eliminating the fluctuations.
This new configuration becomes Core #1A.
The new core configuration did not require a change in the Technical Specifications nor did it create an unresolved safety question.
4.
9-13-94, Install 1/2 inch orifice plates in the drain / vent lines of the six beam ports to insure that the SAR calculations for a pool leak through a beam port are accurate.
The RINSC SAR loss of coolant accident describes the shearing off of the beam port end in the pool providing a leakage path of primary coolant draining through an experimental apparatus and through the one inch drain / vent lines at the top and bottom of the beam port.
Experimental apparatus must be mechanically fixed to the beam port such that any leakage is limited to the equivalent of a 1/2 inch diameter hole.
With the addition of 1/2 inch orifices in the drain / vent lines we
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have limited the total leakage to two 1/2 inch hole equivalents.
Installing orifices in the six beam port drain / vent lines reduced the leakage area from a one inch hole and a 1/2 inch diameter hole to two 1/2 inch diameter holes.
In the event of a pool leak to a beam port the total leakage rate is reduced by more than half.
The addition of 1/2 inch orifice plates in the drain / vent lines does not involve a change in the Technical Specifications nor does it change any Safety Analysis Report conclusion.
5.
11-25-94, Install a magnehlic differential gauge to monitor reactor containment pressure.
The installation of the d/p gauge provides indication of containment pressure during normal and emergency operati'n of the containment building ventilation o
systems.
In the event of an emergency within the containment the proper operation of the evacuation system can easily be checked without having to enter the containment building.
To install the gauge, a 1/2 inch diameter hole was drilled through the reactor room containment wall. A 3/8 inch diameter tube was inserted in the hole and connected to the gage. The hole was sealed and the containment integrity was tested and determined to meet Technical Specifications requirements.
The gauge reading during the weekly testing of the evacuation system will be recorded. Calibration of the gage will be conducted at the same time as the calibration of the gauge installed in the reactor control room.
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ENCLOSURE 5 RINSC ANNUAL REPORT JULY 1, 1994 - JUNE 30, 1995 TECHNICAL SPECIFICATIONS SECTION 6.8.4 4.e.
Environmental surveys performed outside the facility.
A survey was perfumed outside the northeast wall (see attached).
A quarterly TLD badge was deployed on 1/16/95 outside the northeast wall of the reactor room when " hot" items are stored.
The dose during the period 1/16/95 to 4/15/95.was 200 mrem.
This is an area which is not readily accessible to the general public. The dose rates for the period 4/16/95 to 7/15/95 have not been received as of no 4.f.
Annual radiation exposures in excess of 500 mrem.
There were no exposures above this limit.
4.g.
Radioactive Effluents 1.
Gaseous effluent concentrations are documented on the
- Monthly Information Sheets (Form NSC-78).
The gaseous j
effluents, mainly Argon-41, are about 3-4% of the maximum permissible concentrations.
2.
Liquid effluents concentrations, released to the sewer, are documented on the sewer disposal record (Form NSC-32).
The concentrations were well below the monthly sewer limits.
A summary sheet is attached.
- 3. Release to unrestricted area was estimated at 3500 gallons (October 1994),
at concentr4tions below the limits for effluents (20.4% of limit) with a total activity of 1.24 micro Curies.
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s SEWER DISPOSALS JULY 1, 1994 - JUNE 30, 1995 The liquid waste retention tank disposals were made to the municipal sewer system as shown.
The liquid waste that was disposed contained a mixture of isotopes from the primary pool water, namely Na-24, Co-60, Sb-122, Sb-124, Te-132, Sc-46, Cs-127, Zn-65 and H-3.
TOTAL SUM OF DATE
- GALLQJig ACTIVITY FRACTIONS
% OF LIMIT 9/94 9,000 3.2 mci 0.011 1.1 10/94 10,000
<500 Ci 0.072 7.2 12/94 790
<500 Ci 0.025 2.5 l
1 3/95 809
<500 pCi 0.031 3.1 5/95 1,000
<500 Ci 0.027 2.7 All radioactive licptid waste disposed of off-site were.within the limits established by 10CFR20.
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