ML20134M456
| ML20134M456 | |
| Person / Time | |
|---|---|
| Site: | Zion File:ZionSolutions icon.png |
| Issue date: | 08/30/1985 |
| From: | NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION III) |
| To: | |
| Shared Package | |
| ML20134M454 | List: |
| References | |
| 50-295-85-22, 50-304-85-23, NUDOCS 8509040131 | |
| Download: ML20134M456 (1) | |
See also: IR 05000295/1985022
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NRR provided the requested assistance and documented the effort in
a Safety Evaluation Report (SER) issued June 27, 1985. The SER
addressed each of the above issues and concluded that Commonwealth
Edison's treatment of these issues was acceptable. NRR also points
out that should the situation occur again a new and current analysis
should be performed for the new occurrence. The inspector has
reviewed the Safety Evaluation Report and concurs with its conclusions.
The licensee's efforts to identify and correct the cause of 2
temperature deviation have been unsuccessful to date. The '.icensee has
therefore obtained an analysis from Westinghouse which concludes that
the available Departure from Nucleate Boiling Ratio margins for the
previous cycle (8) were unchanged by the reload and that operation in
Cycle 9 with this condition is permissible.
An onsite review of the
Westinghouse analysis was conducted on June 12, 1985. The inspector
has no additional questions at this time.
No violations or deviations were identified.
3.
Sumary of Operations
,
Unit 1
Unit 1 operated at full power levels throughout the inspection period.
Unit 2
Unit 2 operated at power levels as high as 93% at the beginning of the
inspection period and is currently in coastdown in preparation for a
refueling outage.
At 6:25 a.m. on July 18, 1985, the licensee declared the 2B diesel
generator (DG) inoperable after it had tripped on an overspeed condition
thereby placing the unit in a four hour action requirement to be in hot
shutdown as required by Technical Specifications. An Unusual Event was
declared at this time.
Prior to the 2B DG tripping, the 2B Residual Heat Removal (RHR) pump
had been taken out of service.for replacement of the lower motor bearing.
Technical Specification 4.8.3.C requires that when one of the two RHR
pump systems is inoperable the remaining RHR system, both centrifugal
charging pumps and safety injection pumps and associated standby AC and
DC power supplies, be demonstrated to be operable imediately and daily
thereafter. Technical Specifications states further that if the
conditions cannot be met, the reactor shall be brought to hot shutdown
in four hours.
At 7:46 a.m., July 18,1985, the 2B DG was declared operable after
successful completion of a surveillance test and the Unusual Event was
terminated.
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