ML20206L823
| ML20206L823 | |
| Person / Time | |
|---|---|
| Site: | Rancho Seco |
| Issue date: | 11/23/1988 |
| From: | Keuter D SACRAMENTO MUNICIPAL UTILITY DISTRICT |
| To: | Martin J NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION V) |
| References | |
| 88-18, AGM-NPP-88-601, GL-85-02, GL-85-2, NUDOCS 8811300256 | |
| Download: ML20206L823 (5) | |
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SACRt.MENTo MUNICIPAL UT)dTY DISTRICT C 6201 S Street. P.o. Box 15830. Sacramento CA 958521830.(916) 452 3211 AN ELECTRIC SYSTEM SERVING THE HEART OF CALIFORNIA AGM/NPP 88 601 N0Y 2 31988 U.S. Nuclear Regulatcry Co.amission Attn:
J. B. Martin, Regional Administrator Region V 1450 Maria Lane, Suite 210 Halnut Creek, CA 94596 Docket No. 50-312 Rancho Seco Nuclear Generating Station License No. DPR-54 SPECIAL REPORT NUMBER 88-18:
FAILURE TO MAINYAIN SPECIFIC ACTIVITY OF THE PRIMARY SYSTEM HITHIN ADMINISTRATIVE LIMITS
Dear Mr. Hartin:
The specific activity of the primary tystem exceedsd administrative limits specified in Rancho Seco Administrative Procedure RSAP-0222 and as committed to in our response to Generic Letter 85-02.
The bacr&miento Municipal Utility District hereby submi c Special Report No. 38-18 in accordance with Rancho Seco administrative controls.
Members of your staff with questions requiring additional information or clarification may contact Mr. r ic Yochheim at (209) 333-2935, extension 4378.
r Sincerely, C-m i
- -% v Dan R. Keuter A;51stant General Manager Nuclear Power Production Attachment cc w/atch:
. D'Angelo, NRC, Rancho Seco Document Control Desk, Washington DC
$k OObbk RANCHO SECO NUCLEAR GENERATING STATION D 1444o Twin Cities Road. Herald, CA 95638 9799.(209) 333 2935
SPECIAL REPORT NUM8ER 88-18 Failure to Flintain Specific Activity of the l
Primary Sy: tem Hithin Administrative Limits 1
Date of Occurrence Oct'ober 25-26,'1988 Plant Conditions at Time of Occurrence Due to a Technical Specification requirement, the Control Room Operators began a controlled shutdown of the plant on October 25 at 0402 hours0.00465 days <br />0.112 hours <br />6.646825e-4 weeks <br />1.52961e-4 months <br />.
The plant reached hot shutdown conditions at 0843 hours0.00976 days <br />0.234 hours <br />0.00139 weeks <br />3.207615e-4 months <br />.
The react r remained in hot shutdown untti restart on October 29.
Identification of Occurrence The specific activity of the primary system exceeded administrative limits specified in Rancho Seco Administrative Procedure RSAP-0222 Rancho Seco Chemistry Control Commitment.
The procedure requires the submission of a Special Report if the specific activity of the primary coolant is either greater than 0.8 pCi/ml I-131 or 43/E pCi/ml.
Descriotion of Occurrence For the period from approximately 1305 hours0.0151 days <br />0.363 hours <br />0.00216 weeks <br />4.965525e-4 months <br /> on October 25 to 1727 hours0.02 days <br />0.48 hours <br />0.00286 weeks <br />6.571235e-4 months <br /> on October 26, while in a hot shutdown condition, Reactor Coolant System sample data indicated that specific activity was above 0.8 pCi/ml I-131; the 43/E limit was not exceeded.
It is normal for Iodine activity to increase for a short period of time after a power reduction. The District had committed to the 0.8 pCi/mi I-131 limit via letter dated June 11, 1985, in response to Generic Letter 85-02.
Corrective Action Taken In accordance with RSAP-0222, on detection of the unusual condition, isotopic analysis continued until restoration of specific activity to within limits. Control Room Operators placed the alternate Letdown System purification demineralizer in service at 1028 hours0.0119 days <br />0.286 hours <br />0.0017 weeks <br />3.91154e-4 months <br /> on October 26.
The analysis performed on October 26 at 1727 hours0.02 days <br />0.48 hours <br />0.00286 weeks <br />6.571235e-4 months <br /> indicated that specific activity was below 0.8 pC1/ml I-131.
Per RSAP-0222 the following information is enclosed:
{
I Primary coolant specific activity and time duration when the activity exceeded 0.8 pC1/ml I-131 (Attachment 1).
Reactor power history starting 48 hours5.555556e-4 days <br />0.0133 hours <br />7.936508e-5 weeks <br />1.8264e-5 months <br /> prior to the first samp. in i
which the limit was exceeded (Attachment 1).
t Cleanup flow history starting 48 hours5.555556e-4 days <br />0.0133 hours <br />7.936508e-5 weeks <br />1.8264e-5 months <br /> prior to the first samale in which the limit was exceeded (Attachment 2).
l History of degassing operations, if any, starting 48 hours5.555556e-4 days <br />0.0133 hours <br />7.936508e-5 weeks <br />1.8264e-5 months <br />,
to the first sample in which the limit was exceeded.
(No data -
t enclosed for this item because degassing o;,erations were not performed during the period I-131 specific activity exceeded the limit.)
Fu91 burnup by core region (Attachment 3).
L
SPECIAL REPORT 88-18 Failure to Maintain Specific Activity of the Primary System Within Administrative Limits P0HER LEVEL PARAMETER DATE/ TIME
(% Full Paul VALUE I-131 22-Oct-88 02*.00 92.0 7.81E-2 pC1/ml 23-Oct-88 00:15 92.0 9.62E-2 pCl/ml 24-Oct-88 00:20 93.0 8.92E-2 pCi/mi 25-Oct-88 07:20 12.0 2.30E-1 pC1/mi 25-Oct-88 09:00 0.0 3.91E-1 pC1/mi 25-Oct-88 13:05 0.0 9.9E-1 pCi/ml*
25-Oct-88 14:10 0.0 9.35E-1 pC1/m1' 25-Oct-88 16:10 0.0 9.33E-1 pC1/m1' 25-Oct-88 18:10 0.0 1.090 pC1/m1' j
25-Oct-88 22:00 0.0 1.1 pC1/m1' I
26-Oct-88 02:00 0.0 1.04 pCi/m1' 26-Oct-88 06:00 0.0 9.62E-l pC1/mi' 26-Oct-98 10:40 0.0 9.57E-1 pC1/m12*
26-Oct-88 17:27 0.0 6.9E-1 pC1/ml i
- Indicates an administrative limit has been exceeded
- Alternate Letdown System purification demineralizer placed in service l
at 1028 hours0.0119 days <br />0.286 hours <br />0.0017 weeks <br />3.91154e-4 months <br /> i
/
SPECIAL REIOtT 88-18 Failure to Maintain Specific Activity of the Primary System Nithin Administrative Limits PARAMETER DATE/ TIME VALUE-.
LETDOHh 22-Oct-88 02:00 70 GPM FLOW 23-Oct-88 00:15 75 GPM 24-Oct-88 00:20 70 GPM 25-Oct-88 05:40 75 GPH 26-Oct-88 02:00 70 GPH 27-Oct-88 02:00 75 GPM 28-Oct-88 02:00 75 GPH i
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lo.o SPECIAL REPORT 88-18 Failure to Maintain Specific Activity of the Primary Systen Within Administrative Limits BURNUP BATCH #
- OF ASSEMBLES (MHD/MTU)
IE 1
20,800 SC 8
27,765 6B 16 28,183 7
32 24,214 i
8A 24 18.317 8B 40 17,767 f
9 56 5,812 i
Note:. Core Average Burnup - 16,635 MHD/HTU l
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