ML19350A165
| ML19350A165 | |
| Person / Time | |
|---|---|
| Site: | Yankee Rowe |
| Issue date: | 07/11/1974 |
| From: | Autio H YANKEE ATOMIC ELECTRIC CO. |
| To: | NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I) |
| References | |
| AO-50-29-74-4, NUDOCS 8102120181 | |
| Download: ML19350A165 (1) | |
Text
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ABNORMAL OCCURRENCE REPORT REPORT NUMBER:
50-29/7h-h REPORT DATE:
July 11, 197h OCCURRENCE DATE:
July 2, 197h FACILITY:
Yankee Atomic Electric Company, Rowe, Massachusetts 01367 IDENTIFICATION 0F OCCURRENCE:
Chlorides Exceeding Specifications in the Reactor Coolant System CONDITIONS PRIOR TO OCCURRENCE:
Refueling Shutdown, Shutdown Cooling and Purification Systems Operating, Reactor Coolant Temperature at 100 F.
DESCRIPTION OF OCCURRENCE During routine chemistry analysis of the reactor coolant, a chloride ion concentration of 0.1 PPM was detected. This is a violation of Techaical Specifications, Appendix A, Section B.2, referencing Section 106, Reactor Coolant Chemistry of the Final Hazards S e avy Report which lists a chloride ion concentration limit of less than 0.1 PPM.
DESIGNATION OF APPARENT CAUSE OF OCCURRENCE Exhaustion of the purification system ion exchanger.
ANALYSIS OF OCCURRENCE During refueling shutdown normal purification is in service.on the reactor coolant system. A mixed bed' ion exchanger had been in service since the.
start of refueling. The bed indicated-that it was spent on' July 1, 197h.
Remedial action was delayed for one day. By this time the chloride ion concentration reached 0.1 PPM, thereby exceeding the Technical Specification limit of less than 0.1 PPM.
CORRECTIVE ACTION The spent' ion excbanger was replaced on the afternooa of July 2, 197h. At 0100 on' July 3, 197h the chloride concentration had decreased to less than 0.1 PPM.
- The Chemistry Department vill change _its method of chloride analysis from AS'IM D512 Method A to ASTM D512 Method C.
Chlorides as lov as 0.02 PPM can be detected using Method C vt.ile 0.1 PPM is the lowest Method A can detect.
This change in method vill recalt in personnel noting trends at an early enough stage to take corrective action.
FAILURE DATA NA OgjaolfI MJJ d Plant Superintendent
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