ML072500014
| ML072500014 | |
| Person / Time | |
|---|---|
| Site: | Rhode Island Atomic Energy Commission |
| Issue date: | 08/27/2007 |
| From: | Marlone Davis State of RI, Atomic Energy Comm, Nuclear Science Ctr |
| To: | Hughes D Office of Nuclear Reactor Regulation |
| References | |
| Download: ML072500014 (19) | |
Text
PL ANIATIONS Rhode Island Atomic Energy Commission NUCLEAR SCIENCE CENTER 16 Reactor Road Narragansett, R.I. 02882-1165 August 27, 2007 Docket No. 50-193 Mr. Daniel Hughes, Project Manager Non-Power Reactors, Decommissioning and Environmental Project Directorate Division of Reactor Projects - III/ViV U. S. Nuclear Regulatory Commission (NRC)
Washington, D. C. 20555
Dear Mr. Hughes:
This letter and enclosures constitute the annual report required by the RINSC Technical Specifications (Section 6.8.4). Enclosure 1 provides reactor operating statistics. Enclosure 2 provides information pertaining to inadvertent reactor shutdowns or scrams. Enclosure 3 discusses maintenance operations performed during the reporting period. Enclosure 4 describes changes to the facility carried out under the conditions of Section 50.59 of Chapter 10 of the Code of Federal Regulations. Lastly, Enclosure 5 summarizes the radiological controls information. If there are any questions regarding this information, please call me at 401-789-9391.
Sincerely, Reactor Supervisor Enclosures (5)
Copy to:
Mr. Kevin Witt, USNRC Region I Dr. Harry Knickle, Chairman NRSC Dr. Stephen Mecca, Chairman RIAEC Dr. Alfred L. Allen, RIAEC Dr. Peter Gromet, RIAEC Dr. Andrew Kadak, RIAEC Dr. Bahram Nassersharif, RIAEC
ft ENCLOSURE 1 Technical Specifications Section 6.8.4.a Reactor Energy Energy Critical Generated Generated Month (hours) (MWh) (MWd)
July-06 63.10 126.20 5.26 August-06 47.90 66.60 2.78 September-06 20.50 40.90 1.70 October-06 15.30 30.60 1.28 November-06 44.70 89.40 3.73 December-06 28.30 56.60 2.36 January-07 5.00 10.10 0.42 February-07 15.30 30.60 1.28 March-07 10.60 21.10 0.88 April-07 25.20 49.80 2.08 May-07 32.10 63.60 2.65 June-07 18.50 25.30 1.05 2006-07 Totals: 326.50 610.80 25.45 t 1~
Total Energy Output Since Initial Criticality: 60,646.10 2,526.92
ENCLOSUREI (Continued)
NSC-78 Monthly Information Sheet NSC-78 IMonth: Jul-2006I T Revised 3/22/2004 Cumulative MWH's TOTAL LEU Start: 60,646.101 1 End: 160,772.33 11,064.91
- added HEU =49698.01 Run Ave Pwr System Start SID Operating Todays Stack Ar-41 Released No. Day Level On Time Time Time Time total Monitor Limit =4E-4 uCilcc (1-31) (MW) (hhmm) (hhmm) (hhmm) (hrs) MWH max CPM uCilcc Cilday 8009 6 2.00 0837 0958 1258 3.00 6.00 7,000 3.14E-05 0.84 8010 10 2.00 0820 0913 1641 7.47 14.93 10,000 4.49E-05 2.09 8011 11 2.00 0835 0940 1240 3.00 6.00 3,000 1.35E-05 0.84 8012 12 2.00 1110 1238 1538 3.00 6.00 5,000 2.25E-05 0.84 8013 13 2.00 0835 0944 1244 3.00 6.00 9,000 4.04E-05 0.84 8014 14 2.00 0820 0903 1550 6.78 13.57 8,000 3.59E-05 1.90 8015 17 2.00 0820 0910 1120 2.17 4.33 7,000 3.14E-05 0.61 8016 18 2.00 0820 0930 1230 3.00 6.00 11,000 4.94E-05 0.84 8017 19 2.00 0840 0932 1232 3.00 6.00 8,000 3.59E-05 0.84 8018 20 2.00 0835 0940 1240 3.00 6.00 8,000 3.59E-05 0.84 8019 21 2.00 0837 0940 1626 6.77 13.53 10,000 4.49E-05 1.89 8020 24 2.00 0825 0904 1600 6.93 13.87 9,000 4.04E-05 1.94 8021 25 2.00 0830 1015 1315 3.00 6.00 10,000 4.49E-05 0.84 8022 26 2.00 0850 0955 1255 3.00 6.00 9,000 4.04E-05 0.84 8023 27 2.00 0850 0955 1255 3.00 6.00 10,000 4.49E-05 0.84 8025 31 2.00 0838 0925 1225 3.00 6.00 9,000 4.04E-05 0.84 Totals: 1 63.12 126.23 1 1 17.67
SUMMARY
Operating Max. Actual Max. Actual Hours 154.0 63.1 MWH's: 308.0 126.2 Percentage 41% 41%
Stack Releases 17.7 curies
ENCLOSURE I (Continued)
NSC-78 Monthly Information Sheet NSC-78 IMonth: Aug-20061 I Revised 3/22/2004 Cumulative MWH's TOTAL LEU I Start: 60,772.331 I End: 160,838.901 11,131.48 I
- added HEU =49698.01 Run Ave Pwr System Start S/D Operating Todays Stack Ar-41 Released No. Day Level On Time Time Time Time total Monitor Limit =4E-4 uCilcc (1-31) (MW) (hhmm) (hhmm) (hhmm) (hrs) MWH max CPM uCi/cc Ci/day 8025 1 2.00 0845 0930 1305 3.58 7.17 7,000 4.21E-05 1.00 8026 2 2.00 0915 1038 1338 3.00 6.00 7,000 4.21E-05 0.84 8027 3 2.00 0850 0947 1229 2.70 5.40 9,000 5.41 E-05 0.76 8028 8 0.00 0940 1034 10.57 0.00 0.00 8029 8 0.00 1336 1442 1512 0.50 0.00 250 1.50E-06 0.00 8030 9 2.00 0835 0940 1240 3.00 6.00 9,000 5.41 E-05 0.84 8031 10 2.00 0825 0940 1240 3.00 6.00 7,000 4.21 E-05 0.84 8032 15 2.00 0820 0920 1220 3.00 6.00 7,000 4.21 E-05 0.84 8033 17 2.00 0835 0933 1233 3.00 6.00 7,000 4.21E-05 0.84 8034 18 2.00 1043 1140 1440 3.00 6.00 5,000 3.01E-05 0.84 8035 22 2.00 0830 0920 1220 3.00 6.00 8,000 4.81 E-05 0.84 8036 24 2.00 0835 0920 1220 3.00 6.00 8,000 4.81 E-05 0.84 8037 28 0.00 1020 1139 1231 0.87 0.00 500 3.01E-06 0.00 8038 29 2.00 0838 0925 1225 3.00 6.00 7,000 4.21 E-05 0.84 8039 30 0.00 1114 1229 1441 2.20 0.00 7,000 4.21E-05 0.00 8040 31 0.00 1420 1515 1542 0.45 0.00 4,000 2.40E-05 0.00 Totals: 47.87 66.57 6.72
SUMMARY
Operating Max. Actual Max. Actual Hours 147.0 47.9 MWH's: 294.0 66.6 Percentage 33% 23%
Stack Releases 6.7 curies
ENCLOSURE1 (Continued)
NSC-78 Monthly Information Sheet NSC-78 IMonth: Sep-20061 1 Revised 3/22/2004 Cumulative MWH's TOTAL LEU I Start: 60,838.901 I End: 160,879.801 11,172.38 1
- added HEU =49698.01 Run Ave Pwr System Start S/D Operating Todays Stack Ar-41 Released No. Day Level On Time Time Time Time total Monitor Limit = 4E-4 uCi/cc (1-31) (MW) (hhmm) (hhmm) (hhmm) (hrs) MWH maxCPM uCi/cc Ci/day 8041 5 2.00 0840 0948 1248 3.00 6.00 7,500 4.51E-05 0.84 8042 7 2.00 0835 0924 1224 3.00 6.00 8,000 4.81 E-05 0.84 8043 12 2.00 0835 0927 1227 3.00 6.00 7,000 4.21E-05 0.84 8044 14 2.00 0835 0922 1222 3.00 6.00 7,000 4.21E-05 0.84 8045 19 2.00 0835 0937 1237 3.00 6.00 8,000 4.81E-05 0.84 8046 21 2.00 0840 1132 1217 0.75 1.50 8,000 4.81E-05 0.21 8047 26 2.00 0835 0922 1104 1.70 3.40 6,000 3.61E-05 0.48 8048 29 2.00 0842 1013 1313 3.00 6.00 7,000 4.21E-05 0.84 Totals: 20.45 40.90 5.73
SUMMARY
Operating Max. Actual Max. Actual Hours 147.0 20.5 MWH's: 294.0 40.9 Percentage 14% 14%
Stack Releases 5.7 curies
a ENCLOSURE 1 (Continued)
NSC-78 Monthly Information Sheet NSC-78 I Month: OCt-2006 I I Revised 3/22/20041 Cumulative MWH's TOTAL LEU I Start: 60,879.80 1 I End: 160,910.401 11,202.98 I
- added HEU =49698.01 Run Ave Pwr System Start S/D Operating Todays Stack Ar-41 Released No. Day Level On Time Time Time Time total Monitor Limit = 4E-4 uCi/cc (1-31) (MW) (hhmm) (hhmm) (hhmm) (hrs) MWH max CPM uCi/cc Ci/day 8049 3 2.00 0840 0926 1153 2.45 4.90 7,000 4.21 E-05 0.69 8050 5 2.00 0835 0940 1145 2.08 4.17 7,000 4.21E-05 0.58 8051 10 2.00 0835 0924 0958 0.57 1.13 7,000 4.21E-05 0.16 8052 11 2.00 0840 0945 1150 2.08 4.17 8,000 4.81E-05 0.58 8053 17 2.00 0835 0925 1258 3.55 7.10 110 5.09E-05 0.99 8054 19 2.00 0840 0942 1059 1.28 2.57 110 5.09E-05 0.36 8055 24 2.00 0838 0943 1300 3.28 6.57 160 7.41 E-05 0.92 Totals: 15.30 30.60 4.28
SUMMARY
Operating Max. Actual Max. Actual Hours 154.0 15.3 MWH's: 308.0 30.6 Percentage 10% 10%
Stack Releases 4.3 curies
ENCLOSURE I (Continued)
NSC-78 Monthly Information Sheet NSC-78 Month: NOV-20061 I Revised 3/22/2004 Cumulative MWH's TOTAL LEU Start: 60,910.40 1 End: 160,999.80 11,292.38
- added HEU = 49698.01 Run Ave Pwr System Start S/D Operating Todays Stack Ar-41 Released No. Day Level On Time Time Time Time total Monitor Limit= 4E-4 uCi/cc (1-31) (MW) (hhmm) (hhmm) (hhmm) (hrs) MWH max CPM uCi/cc Ci/day 8056 2 2.00 0835 0934 1012 0.63 1.27 150 6.95E-05 0.18 8057 9 2.00 0835 0930 1118 1.80 3.60 150 6.95E-05 0.50 8058 14 2.00 0835 0928 1228 3.00 6.00 160 7.41E-05 0.84 8059 16 2.00 0835 0923 0950 0.45 0.90 160 7.41E-05 0.13 8060 20 2.00 0830 0920 1637 7.28 14.57 170 7.87E-05 2.04 8061 21 2.00 0840 0933 1103 1.50 3.00 160 7.41E-05 0.42 8062 22 2.00 0830 0918 1625 7.12 14.23 250 1.16E-04 1.99 8063 27 2.00 0828 0915 1610 6.92 13.83 210 9.72E-05 1.94 8064 28 2.00 0830 0918 1052 1.57 3.13 200 9.26E-05 0.44 8065 29 2.00 0826 0914 1628 7.23 14.47 175 8.10E-05 2.03 8066 30 2.00 0804 0912 1624 7.20 14.40 250 1.16E-04 2.02 Totals: 1 44.70 89.40 12.52
SUMMARY
Operating Max. Actual Max. Actual Hours 133.0 44.7 MWH's: 266.0 89.4 Percentage 34% 34%
Stack Releases 12.5 curies
ENCLOSURE1 (Continued)
NSC-78 Monthly Information Sheet NSC-78 Month: DeC-2006I Revised 3/22/20041 Cumulative MWH's TOTAL LEU I Start: 60,999.801 I End: 161,056.371 11,348.95 I
- added HEU = 49698.01 Run Ave Pwr System Start S/D Operating Todays Stack Ar-41 Released No. Day Level On Time Time Time Time total Monitor Limit = 4E-4 uCi/cc (1-31) (MW) (hhmm) (hhmm) (hhmm) (hrs) MWH max CPM uCi/cc Ci/day 8067 4 2.00 0825 0914 1632 7.30 14.60 250 1.16E-04 2.04 8068 5 2.00 0825 0918 1052 1.57 3.13 150 6.95E-05 0.44 8069 6 2.00 0825 0913 1630 7.28 14.57 175 8.1OE-05 2.04 8070 7 2.00 0825 0926 1226 3.00 6.00 150 6.95E-05 0.84 8071 8 2.00 0830 0957 1036 0.65 1.30 170 7.87E-05 0.18 8072 12 2.00 0825 0920 1220 3.00 6.00 175 8.1OE-05 0.84 8073 14 2.00 0835 0923 1022 0.98 1.97 140 6.48E-05 0.28 8074 19 2.00 0825 0915 1045 1.50 3.00 160 7.41 E-05 0.42 8075 27 2.00 0825 0915 1215 3.00 6.00 225 1.04E-04 0.84 Totals: 28.28 56.57 7.92
SUMMARY
Operating Max. Actual Max. Actual Hours 154.0 28.3 MWH's: 308.0 56.6 Percentage 18% 18%
Stack Releases 7.9 curies
ENCLOSURE1 (Continued)
NSC-78 Monthly Information Sheet NSC-78 IMonth: Jan-07 I I Revised 3/22/2004 Cumulative MWH's TOTAL LEU Start: 61,056.37 1 End: 161,066.44 11,368.43]
- added HE U =49698.01 Run Ave Pwr System Start S/D Operating Todays Stack Ar-41 Released No. Day Level On Time Time Time Time total Monitor Limit = 4E-4 uCi/cc (1-31) (MW) (hhmm) (hhmm) (hhmm) (hrs) MWH max CPM uCi/cc Cilday 8076 4 2.00 0830 0923 1010 0.78 1.57 150 6.95E-05 0.22 8077 9 2.00 0830 0916 0950 0.57 1.13 120 5.56E-05 0.16 8078 11 2.00 0830 0915 1025 1.17 2.33 120 5.56E-05 0.33 8079 18 2.00 0840 0926 1020 0.90 1.80 120 5.56E-05 0.25 8080 23 2.00 0830 0918 1002 0.73 1.47 120 5.56E-05 0.21 8081 25 2.00 0838 0925 1002 0.62 1.23 120 5.56E-05 0.17 8082 30 2.00 1047 1201 1217 0.27 0.53 100 3.04E-07 0.07 Totals: 1 5.03 10.07 1.41
SUMMARY
Operating Max. Actual Max. Actual Hours 147.0 5.0 MWH's: 294.0 10.1 Percentage 3% 3%
Stack Releases 1.4 curies
ENCLOSURE 1 (Continued)
NSC-78 Monthly Information Sheet NSC-78 Month: Feb-07 I I Revised 3/22/2004 Cumulative MWH's TOTAL LEU I Start: 61,066.441 1End: 161,097.00111,398.991
- added HE U =49698.01 Run Ave Pwr System Start S/D Operating Todays Stack Ar-41 Released No. Day Level On Time Time Time Time total Monitor Limit = 4E-4 uCi/cc (1-31) (MW) (hhmm) (hhmm) (hhmm) (hrs) MWH max CPM uCi/cc Ci/day 8083 1 2.00 0830 0931 1035 1.07 2.13 120 3.65E-07 0.30 8084 6 2.00 0835 0935 1140 2.08 4.17 120 3.65E-07 0.58 8085 8 2.00 0835 1039 1100 0.35 0.70 90 2.74E-07 0.10 8086 13 2.00 0830 0923 1223 3.00 6.00 150 4.56E-07 0.84 8087 15 2.00 0845 0945 1245 3.00 6.00 110 3.34E-07 0.84 8088 20 2.00 0841 0925 1009 0.73 1.47 80 2.43E-07 0.21 8089 22 2.00 0854 0944 1138 1.90 3.80 100 3.04E-07 0.53 8090 27 2.00 0830 0920 1229 3.15 6.30 100 3.04E-07 0.88 Totals: 15.28 30.57 4.28
SUMMARY
Operating Max. Actual Max. Actual Hours 140.0 15.3 MWH's: 280.0 30.6 Percentage 11% 11%
Stack Releases 4.3 curies
ENCLOSURE1 (Continued)
NSC-78 Monthly Information Sheet NSC-78 Month: Mar-07 I I Revised 3/22/20041 Cumulative MWH's TOTAL LEU I Start: 61.097.001 I End: 161,118.14111,410.721
- added HEU = 49698.01 Calibration Factor =0.000449 Run Ave Pwr System Start SID Operating Todays Stack Ar-41 Released No. Day Level On Time Time Time Time total Monitor Limit = 4E-4 uCi/cc (1-31) (MW) (hhmm) (hhmm) (hhmm) (hrs) MWH max CPM uCi/cc Ci/day 8091 1 2.00 0830 0935 1148 2.22 4.43 150 4.56E-07 0.62 8092 6 2.00 0830 0930 1004 0.57 1.13 120 3.65E-07 0.16 8093 8 2.00 0825 0914 1132 2.30 4.60 120 3.65E-07 0.64 8094 13 2.00 0830 0952 1125 1.55 3.10 150 4.56E-07 0.43 8095 20 2.00 0835 0928 1008 0.67 1.33 150 4.56E-07 0.19 8096 22 2.00 0830 0930 1028 0.97 1.93 150 4.56E-07 0.27 8097 27 2.00 0830 0955 1130 1.58 3.17 160 4.86E-07 0.44 8098 28 2.00 1138 1215 1258 0.72 1.43 100 3.04E-07 0.20 Totals: 10.57 21.13 2.96
SUMMARY
Operating Max. Actual Max. Actual Hours 147.0 10.6 MWH's: 294.0 21.1 Percentage 7% 7%
Stack Releases 3.0 curies
ENCLOSURE1 (Continued)
NSC-78 Monthly Information Sheet NSC-78 Month: Apr-07I I Revised 3/22/20041 Cumulative MWH's TOTAL LEU Start: 61,118.141 1End: 161,167.90 11,460.48
- added HEU = 49698.01 Run Ave Pwr System Start SID Operating Todays Stack Ar-41 Released No. Day Level On Time Time Time Time total Monitor Limit =4E-4 uCi/cc (1-31) (MW) (hhmm) (hhmm) (hhmm) (hrs) MWH max CPM uCi/cc Ci/day 8099 3 2.00 0832 0940 1327 3.78 7.57 150 4.56E-07 1.06 8100 10 2.00 0830 1107 1517 4.17 8.33 190 5.78E-07 1.17 8101 12 2.00 0820 1133 1134 0.02 0.03 100 3.04E-07 0.00 8102 16 2.00 1328 1417 1420 0.03 0.06 100 3.04E-07 0.01 8103 17 2.00 0828 0952 1235 2.72 5.43 200 6.08E-07 0.76 8104 19 2.00 0903 0959 1530 5.52 11.03 150 4.56E-07 1.54 8105 20 0.10 1430 1529 1530 0.02 0.00 150 4.56E-07 0.00 8106 23 1.00 1450 1515 1551 0.60 0.60 60 1.82E-07 0.08 8107 24 2.00 0926 1038 1255 2.28 4.57 160 4.86E-07 0.64 8108 26 2.00 0828 0923 1527 6.07 12.13 175 5.32E-07 1.70 Totals: 25.20 49.76 6.97
SUMMARY
Operating Max. Actual Max. Actual Hours Percentage 154.0 25.2 16%
MWH's:
116%
308.0 49.8 Stack Releases 7.0 curies I
ENCLOSURE I (Continued)
NSC-78 Monthly Information Sheet NSC-78 Month: May-07 I I Revised 3/22/2004 Cumulative MWH's TOTAL LEU Start: 61,167.901 End: 161,224.931 11,517.51
- added HEU = 49698.01 Run Ave Pwr system Start SID Operating Todays Stack Ar-41 Released No. Day Level On Time Time Time Time total Monitor Limit =4E-4 uCi/cc (1-31) (MW) (hhmm) (hhmm) (hhmm) (hrs) MWH max CPM uCi/cc Cilday 8109 1 2.00 0830 0918 1115 1.95 3.90 150 6.74E-07 0.55 8110 3 2.00 0830 1020 1343 3.38 6.77 110 4.94E-07 0.95 8111 8 2.00 0830 0920 1235 3.25 6.50 150 6.74E-07 0.91 8112 9 2.00 0830 1000 1455 4.92 9.83 230 1.03E-06 1.38 8113 10 2.00 0830 0940 1000 0.33 0.67 140 6.29E-07 0.09 8114 15 2.00 0835 0930 1500 5.50 11.00 200 8.98E-07 1.54 8115 17 2.00 0840 0935 1246 3.18 6.37 200 8.98E-07 0.89 8116 22 2.00 0830 0950 1250 3.00 6.00 150 6.74E-07 0.84 8117 24 2.00 0835 1034 1334 3.00 6.00 200 8.98E-07 0.84 8118 29 0.00 0840 1006 1025 0.32 0.00 20 8.98E-08 0.00 8119 30 2.00 0830 0927 1244 3.28 6.57 160 7.18E-07 0.92 Totals: 32.12 63.60 1 8.90
SUMMARY
Operating Max. Actual Max. Actual Hours 147.0 32.1 MWH's: 294.0 63.6 Percentage 22% 22%
Stack Releases 8.9 curiesA
ENCLOSURE 1 (Continued)
NSC-78 Monthly Information Sheet NSC-78 IMonth: Jun-20071 Revised 3/22/2004]
Cumulative MWH's TOTAL LEU I Start: 61,224.931 1 End: 161,250.201 11,542.78
- added HEU = 49698.01 Run Ave Pwr System Start S/D Operating Todays Stack Ar-41 Released No. Day Level On Time Time Time Time total Monitor Limit = 4E-4 uCi/cc (1-31) (MW) (hhmm) (hhmm) (hhmm) (hrs) MWH max CPM uCi/cc Ci/day 8120 5 2.00 0840 0955 1115 1.33 2.67 150 6.74E-07 0.37 8121 6 2.00 1110 1206 1355 1.82 3.63 150 6.74E-07 0.51 8122 7 2.00 0835 1012 1312 3.00 6.00 200 8.98E-07 0.84 8123 12 2.00 0830 0927 1039 1.20 2.40 150 6.74E-07 0.34 8124 14 2.00 0830 0922 1439 5.28 10.57 200 8.98E-07 1.48 8125 19 0.00 1030 1109 1542 4.55 0.00 0 0 0.00 8126 28 0.00 0915 1051 1135 0.73 0.00 22 9.88E-08 0.00 8127 29 0.00 1310 1533 1608 0.58 0.00 22 9.88E-08 0.00 Totals: I_1 _ 1_18.50 25.27 3.54
SUMMARY
Operating Max. Actual Max. Actual Hours 147.0 18.5 MWH's: 294.0 25.3 Percentage 13% 9%
Stack Releases 3.5 curies
ENCLOSURE 2 EMERGENCY SHUTDOWNS AND SCRAMS The following is a listing of the emergency shutdowns and inadvertent scrams that occurred during the 2006-2007 reporting period. This information is required by Technical Specification 6.8.4.b.
DATE RUN # LOGBOOK / PAGE DESCRIPTION 7/12/06 8012 54/73 Dropped Blade #1.
7/25/06 8021 54/82 Dropped Blade #1 three times.
7/26/06 8022 54/83 Dropped Blade #1.
8/3/06 8027 54/88 Scram due to building power failure.
9/28/06 8048 54/110 Scram due to operator error.
10/5/06 8050 54/112 Dropped Blade #3.
10/11/06 8052 54/114 Dropped Blade #3.
10/24/06 8055 54/117 Dropped Blade #2.
12/1/06 8066 54/128 Scram due to noise as a result of a relay jumper falling off.
3/1/07 8091 55/16 Dropped Blade #1.
3/13/07 8094 55/20 Dropped Blade #3.
3/27/07 8097 55/23 Dropped all four shim safety blades.
4/10/07 8100 55/27 Dropped Blades #3 and #4 twice.
4/12/07 8101 55/29 Dropped all blades twice. Dropped #3. Dropped #3 and #4 twice.
4/17/07 8103 55/31 Dropped Blades #1 and #2.
4/19/07 8104 55/32 Dropped Blades #1 and #2. Dropped all four shim safety blades.
4/20/07 8105 55/33 Dropped Blades #3 and #4.
5/3/07 8110 55/38 Scram. Dropped Blade #1.
5/9/07 8112 55/40 Dropped all four shim safety blades.
5/10/07 8113 55/41 Dropped Blade #1.
5/22/07 8116 55/44 Dropped Blade #3.
5/24/07 8117 55/45 Dropped Blade #3 due to misalignment.
5/29/07 8118 55/46 Dropped all four shim safety blades.
6/7/07 8122 55/50 Scram when switching the regulating blade to auto mode.
ENCLOSURE 2 EMERGENCY SHUTDOWNS AND SCRAMS Most of the unplanned shutdowns occurred because a shim safety blade magnet failed to hold on to the associated blade. Factors that contribute to this problem include misalignment between the magnet and the armature, and vibration caused by coolant flow past the blades.
Run #8066:
The latching relay for the regulating blade auto mode failed. A jumper was put into the system in order to make the auto mode function properly. A scram occurred when the jumper fell off and introduced noise in the system. The relay has been replaced.
Run #8097:
One of the shim safety blades dropped, followed by the release of other three blades. The suspected cause was that the vibration caused by the first blade knocked the other three blades loose.
Runs #8 100 through #8105:
Blades started dropping in pairs. In each case, the pair of blades that dropped shared the same magnet amplifier. Ultimately, it was determined that some of the magnet current switch connections were loose, causing momentary current losses in a magnet current amplifier.
Run #8110:
A scram occurred with no indication of the cause.
Run #8122:
A scram occurred when the regulating blade was switched to auto mode. The switch caused noise in the system.
ENCLOSURE 3 The following is a listing of the major maintenance operations performed in the 2006-2007 reporting period which includes impact upon the safe operation of the reactor and the reasons for corrective maintenance.
This information is required by Technical Specification 6.8.4.c.
During the 10/23/06 Pool Inspection, it was noted that the gasket on the cooling system outlet coupling was torn. Consequently, the gasket was replaced. The project involved unloading the fuel, gating off the high power section of the pool, and draining the high power section to a water level below the inlet and outlet couplings.
ENCLOSURE 4 FACILITY CHANGES - 10CFR50.59 REVIEW The following is a listing and description of 10CFR50.59 evaluations conducted during the 2006-2007 reporting period. This information is required by Technical Specification 6.8.4.d.
- 1. Reactor Rod Control Equipment Change Pursuant to 10CFR50.59, a committee was formed to evaluate an upgrade of the rod control system.
The proposed system would use Opto22 industrial automation hardware and software to manipulate the control rods. The NRSC approved the upgrade. The shim safety rod drive motors and gear reducers have been replaced with stepper motors and reducers.
- 2. Emergency Plan Revision Pursuant to 10CFR50.54(q), the RINSC Emergency Plan was revised to reflect current practices. This section of the regulation describes the types of changes that can be made to the Emergency Plan without NRC approval. All of the revisions that were made were deemed to be within the scope of this regulation. The NRSC approved the changes, and the Emergency Plan Implementing Procedures have been updated to reflect these changes.
'1 -'
ENCLOSURE 5 RADIOLOGICAL CONTROLS
- 1. Environmental Surveys Outside the Facility - Technical Specification 6.8.4.e Quarterly OSL' badges are deployed outside the reactor building in three separate locations. The general public does not frequent these locations and therefore occupancy factors may be used to approximate annual dose. The allowable external dose rates must be below 50 mrem per year. The quarterly doses in units of mrem are shown in the table below.
LOCATION 3 RD QTR 2006 4r' QTR 2006 1 ST QTR 2007 2ND QTR 20072 Northeast Wall 75 27 23 25 Demineralizer 198 108 97 55 Door Heat Exchanger 78 22 22 22 Door These areas are in locations where access is limited. Consequently, the general public will not frequent these areas, and appropriate occupancy factors can be used to approximate annual dose. Assuming that the maximum time that a member of the general public would be present in one of these locations is 15 minutes per day, an occupancy factor of 0.01 can be used to obtain the annual dose that would be received by a member of the general public, in any of these areas.
The dose rate in the Northeast Wall area is due to storage of RAM, and is present regardless of reactor operation. Applying the occupancy factor, the annual dose to an individual in this area would be 1.5 mrem over the course of last year. The annual dose rate at the Demineralizer and Heat Exchanger Doors is dependent on the operations schedule of the reactor. Ignoring the fact that the dose rate is not present 24 hours2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br /> per day, and applying the occupancy factor of 0.01, the annual dose that would be received by an individual at the Demineralizer Door would be 4.58 mrem. Likewise the dose received at the Heat Exchanger Door would be 1.44 mrem. The variations from quarter to quarter and from previous reports were due in part to movements of items within the reactor building during the fiscal year.
- 2. Annual Exposures Exceeding 500 mrem - Technical Specification 6.8.4.f There were no personnel exposures greater than 500 mrem.
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- 3. Radioactive Effluents - Technical Specification . .4.g A. Gaseous effluent concentrations are documented on the Monthly Information Sheets (Form NSC-
- 78) enclosed. The gaseous effluents, primarily Argon-41, were less than 5% of the 10 CFR 20, Appendix B, Table 2, Column 1 effluent limits.
B. Liquid effluent concentrations released to the sewer are documented on the Sewer Disposal Record (Form NSC-52) and/or the Liquid Release Record (Form NSC-17). On September 15, 2006, 600 gallons containing 156.486 microcuries of tritium, 0.103 microcuries of cobalt-60, 0.203 microcuries of zinc-65, 0.018 microcuries of antimony- 124 and 0.062 microcuries of europium- 152 were discharged to the sewer. The sum of the fractions for release totaled 0.011 (about 1%) of the discharge limit.
On June 20, 2007, 6681 gallons of pool water were discharged to the sewer during the gasket replacement project. The water contained 9,360 microcuries of tritium, 11 microcuries of sodium-24 and 4.34 microcuries of antimony-122. The sum of the fractions for the release totaled 0.038 (about 4%) of the discharge limit.
Optically Stimulated Luminescence 2 Landauer reads the OSL dosimeters to 1 mrem.