ML19312C274
| ML19312C274 | |
| Person / Time | |
|---|---|
| Site: | Oconee  |
| Issue date: | 07/10/1974 |
| From: | Thies A DUKE POWER CO. |
| To: | |
| References | |
| NUDOCS 7912120848 | |
| Download: ML19312C274 (3) | |
Text
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!.ZC DISr.! 'J~iC' 702 ?A?T 50 DCCRET Y.ATERIAL 6912 (TaiPO?ARY FORM)
CONTROI. NO:
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FILE:
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DATE OF DOC DATE P2C'D LTR TWX RPT CT:-ER Duko Power Cotapany Charlotte, N.C. 28201 Mr. A.C. Thies
'7-10-74 7-26-74 X
TO:
ORIG CC OTIER SENT AEC PER XXX N.C. Moseley none signed SENT LOCAL P R m
CLASS C; CLASS PROP INFO INPUT NO CYS REC'D DOCY2T NO:
XXX 1
50-269 DESCRIPTICN:
ENCLCSUP2S:
Ltr r porting an abnormal occurrence at the
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OctnO2 Nuclear Sation Unit #1...cencerning...
un:xngeted level of radioactivity in the
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Component Cooling System......
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July 10, 1974
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f JUL0'I,9745 A lir. Elorman C. Moseley, Director
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Directorate of Regulatory Operations 4
U. S. Atomic Energy Cocaission MQ D
Region II - Suite 818 h'
4 230 Peachtree Street, Norrhvest Cu nic Atlanta, Georgia 30303 50-269
Dear Mr. Moseley:
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This letter is to report an unexpected level of radioactivity in the Component Cooling System of the Oconee Nuclear Station, Unit 1.
Radiochemical tests conducted prior to criticality and'during escalation to 75 percent of full power indicated no activity in the component Cooling System.
In late June 1973, activity in the system was found to The activity level returned to normal bac,.be twice normal background.
kground in a short period of time.
In mid July 1973, system activity again exceeded twice background level and has since remained
.there.
Since the discovery of the activity, a high pressure injection and component cooling leak test has been performed. Due to the small leakage rate and the inability to fully separate Units 1 and 2, the
.results of the test were inconclusive. The most likely place for a leak to exist is in the reactor coolant pump seal heat exchangers or the. letdown coolers.
EmMnchemistry has been closely monitored since detection and gamma spectrum analyses have shown only long-lived fission products.
The
.setivity is independent of reactor power level. Boric acid has not been
. detected in the Component Cooling System.
The. low. level of activity in the system in no way hinders the operation of.the~. plant or its components.
Isolation of the Component Cooling System at the reactor building is not in,21 red by this level of
.ctivity.
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Mr. Elorman C. Moseley Page 2 July 10, 1974 The level of radioactivity and its isotopic content are being monitored on s. regular basis. Another leak test is being devised and will be performed during Unit 1 refueling.
Very truly yours,
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A..C. Thies Mr. Angeio Giambusso
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