ML20070H232
| ML20070H232 | |
| Person / Time | |
|---|---|
| Site: | Perry  |
| Issue date: | 06/03/1994 |
| From: | Stratman R CENTERIOR ENERGY |
| To: | NRC OFFICE OF NUCLEAR MATERIAL SAFETY & SAFEGUARDS (NMSS) |
| References | |
| GL-91-02, GL-91-2, PY-CEI-NMSS-002, PY-CEI-NMSS-2, NUDOCS 9407210166 | |
| Download: ML20070H232 (3) | |
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I csw1remon ENERGY PERRY NUCLEAR POWER PLANT Mail Address:
Robert A.Stratman l
10 CENTER ROAD R, O 10 44o81 PERRY, OHIO 44081 (216) 259 4737 j
June 3, 1994 l
PY-CEI/NMSS-0025L l
Director Division of Low-Level Vaste Management and Decommissioning U. S. Nuclear Regulatory Commission Vashington, D.C.
20555 j
l Perry Nuclear Power Plant Docket No. 50-440 Reporting of Low-Level Vaste Form Mishap
Dear Sir:
Generic Letter 91-02, " Reporting Mishaps Involving LLV Forms Prepared for Disposal", requested licensees to voluntarily submit Low-Level Vaste Form Mishap information to the Nuclear Regulatory Commission (NRC) in order to j
provide field information to the staff.
1 On May 5, 1994, a High Integrity Container (HIC) being prepared for shipment was confirmed to have gas concentrations in excess of the Perry Nuclear Power Plant (PNPP) site administrative limit established for shipping devatered radioactive vaste. This limit is 0.2% of the lover explosive limit (LEL). The highest measured reading of the HIC vas approximately 10% LEL. The HIC was not shipped. A description of the HIC (HIC 94-027) is included in Attachment 1.
The event description is included in Attachment 2.
If you have questions or require additional information, please contact Mr. J. D. Kloosterman, Manager - Regulatory Affairs at (216) 280-5833.
Very truly yours,
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9407210166 940603 PDR ADOCK 05000440 S
PDR RAS:JEE:sc Attachments cc:
V. R. Autry, Director, Division of Radioactive Material Licensing and Control Department of Health and Environmental Control - South Carolina
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NRC Fil.E CENTER COPY Toledo Eason
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PY-CEI/NMSS-0025L Description of High Integrity Container (HIC)94-027 Type:
NUPAC, Model EL-142, Crosslinked Polyethylene HIC with POVDEX Internals Contents:
92 Cubic Feet Devatered Powdered Resin a
Vaste Classification:
Class B Total Activity:
1950 Curies Major Isotopes:
Co-60 Zn-65 Cr-51 Mn-54 Co-58 Cs-134 Cs-137 i
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PY-CEI/NHSS-0025L Attechment 2 Event Description Reactor Vater Backvash Settling Tank B (RBST B) is a storage tank for discarded filter media / resin from the plant Reactor Vater Cleanup System filter /demineralizers. The vaste that was processed in HIC 94-027 had previously processed reactor coolant.
RBST B was sampled for the presence of bacteria using three different types of test kits. The kits used were the Easicult TTC kit for total bacteria, the Betz H11 kit for total bacteria, and the Betz M12 kit for sulfate reducing (anaerobic) bacteria. The results of the Betz M11 kit indicated the presence of a small population of bacteria. However, the Easicult kit and Betz M12 kit results were both below the " lover limit of detection". The Betz M12 results are notable in that there was no significant anaerobic bacteria population (the bacteria which produces methane gas as a digestive system byproduct).
RBST B was isolated for vaste processing on 3/28/94. The vaste was processed between 4/19/94 and 4/21/94. During this time, the vaste was dried for approximately 15 hours1.736111e-4 days <br />0.00417 hours <br />2.480159e-5 weeks <br />5.7075e-6 months <br /> to ensure <0.5% free standing water. On 4/27/94 the vaste was monitored for gas generation using an electronic gas detector (the detector samples for methane and carbon dioxide). After several hours, the detector indicated the presence of methane gas (10% LEL). Another gas detector of a different type (the detector samples for explosive gas, carbon monoxide, and oxygen) was installed to verify the results of the first detector. The second detector did not indicate the presence of explosise gas (0% LEL). At this point the HIC was closed. It was then decided to perform another five day gas check, but with another type of explosive gas detector.
On 5/5/94 a new explosive gas detector was obtained and used to test the HIC for methane gas generation. This detector samples for methane, oxygen, carbon monoxide, and hydrogen sulfide. Additionally, the original electronic gas detector was recalibrated and reinstalled to test for methane gas. The results from both detectors indicated the presence of methane gas (approximately 4-5%
LEL). As a result, the decision was made not to ship HIC 94-027.
The final disposition of HIC 94-027 has not yet been determined.
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