ML19308A959
| ML19308A959 | |
| Person / Time | |
|---|---|
| Site: | Oconee  |
| Issue date: | 09/07/1973 |
| From: | DUKE POWER CO. |
| To: | |
| Shared Package | |
| ML19308A957 | List: |
| References | |
| NUDOCS 7912120729 | |
| Download: ML19308A959 (2) | |
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Regulatorj Ocdat Ee.
0 uwpa um w.A ~I* U D0KE POWER COMPANY OCONEE NUCLEAR STATION - UNIT 1 ABNORMAL OCCURRENCE REPORT A0-269/73-5 FAILURE TO VERIFY OPERABILITY OF REACTOR BUILDING SPRAY PUMP 1B AFTER MAINTENANCE Introduction As a limiting condition for operation, the Oconee Nuclear Station Technical Specifications require that two reactor building spray pumps be operable before the reactor is made critical.
On August 30, 1973, it was determined that Oconee Unit 1 had been made critical although reactor building spray pump 1B had not been tested to verify its operability after maintenance had been performed on the pump.
Regulatory Operations, Region II, was verbally notified of the incident on August 30, 1973.
P Description of the Incident Dure g a maint'enance outage'on Oconee Unit 1, Reactor Building Spray Pump 1B was duassembled, inspected for wear, cleaned, and af ter replacement of a gasket, reassembled.
This work was completed on the afternoon of August 26, 1973.
The pump was not run after reassembly to verify its operability.
On August 29, 1973, Unit 1 was made critical and commenced power operation.
Technical Specification 3.3 requires two reactor building spray pumps be operable before the reactor is made critical.
Failure to test the pump after reassembly provided no assurance of the immediate availability of both spray units for post-accident reactor building. cooling.
The failure to meet retest requirements on this pump was attributed to the following:
A.
The plant work order issued for maintenance of the pump was not adequately reviewed upon completion of the work.
The form provides documentation of retest requirements and should not be signed off until all requirements are met and documentation is complete.
B.
The procedure used (MP/0/A/1400/28) in performing maintenance on this pump does not contain adequate provisions for documentation to certify the work has been performed or retest requirements have been met.
C.
All provisions for documentation in MP/0/A/1400/28 were not completed.
Corrective Action Periodic test PT/0/A/0204/7, "RBS Pump Performance Test," was performed immediately, and the operability of the pump verified.
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The station superintendent will issue a memorandum stating instructions for the proper completion of a plant work order.
The appropriate supervisor will review the plant work order for completeness, including all retesting require-ments.
The memorandum will also stress to maintenance personnel the importance of following procedures and properly documenting all work on safety-related systems.
Safety Analysis Figure 14-56 of the Oconee FSAR shows that for the worst-case loss-of-coolant accident, with cnly three reactor building coolers operable, the containment e
design pressure will not be exceeded.
Even if Reactor Building Spray Pump 1B had proven to be inoperable, three reactor building cooling units and one reactor building spray were available to provido adequate reactor building cooling ip the event of a loss-of-coolant accident.
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