ML20086F418
| ML20086F418 | |
| Person / Time | |
|---|---|
| Site: | Peach Bottom, 05000000 |
| Issue date: | 12/09/1976 |
| From: | Cooney M PECO ENERGY CO., (FORMERLY PHILADELPHIA ELECTRIC |
| To: | James O'Reilly NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I) |
| Shared Package | |
| ML19289B554 | List: |
| References | |
| NUDOCS 8312270034 | |
| Download: ML20086F418 (2) | |
Text
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s PHILADELPHIA ELECTRIC COMPANY 2301 MARKET STREET PHILADELPHI A. PA.19101 Igp
%Py (215) e414ooO December 9, 1976 j
Ret Docket Nos.:
50-277 C' s.'
50-278
'N Q
Mr. J. P. O'Reilly Director, Region 1
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Office of Inspection and Enforcement
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U. S. Nuclear Regulatory Comnission
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631 Park Avenue n h '/
King of Prussia, Pa.
19406 4
Subject:
Unique Report for Plant Iodine and Particulate Release Rate Exceeded Four Forcent of Technical Specification 3.8.C.2 Averaged Over the Fourth Calendar Quarter of 1976
Dear Mr. 08Reilly:
This letter is being transmitted in accordance witn the unique reporting requirements specified in Technical Specification 3.8.C.3.b, which states that the Director of Region 1 should be informed when the release rate ex-ceeds four percent of Technical Specification 3.8.0.2 when averaged over a calender quarter.
Accarent Cause The sources of the releases of I-131 and particulates during the fourth quarter of 1976 were leaks in the reactor water clean-up systems (RWCU).
The major isotope was I-131 with particulates having half lives greater than eight days comprising only ten percent of the total releases. During the first five weeks of the quarter approximately eighty-five percent of activity released was from the Unit 2 reactor and turbine building ventilation systems with the remainder from the Unit 3 system.
Analvsis of Occurrenee Most of the primary coolant leakage which contributed to the releases was from the Unit 2 RWCU regenerative heat exchange head flanges. Two other incidents have occurred which were significant contributors to the release rates.
The first was a leak on a Unit 2 instrument nitrogen compressor on November 10.
The second was a normal nuclear system depressurization associated with a shut-down of Unit 2 reactor on November 14.
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