ML18078A862
| ML18078A862 | |
| Person / Time | |
|---|---|
| Site: | Salem  |
| Issue date: | 02/16/1979 |
| From: | Kapple A Public Service Enterprise Group |
| To: | |
| Shared Package | |
| ML18078A861 | List: |
| References | |
| NUDOCS 7902230126 | |
| Download: ML18078A862 (2) | |
Text
Report Number:
Report Date:
Occurrence Date:
79-10/04L 02-16-79 1-18-79 Facility:
Salem Generating Station Public Service Electric & Gas Company Hancock's Bridge, New Jersey 08038 IDENTIFICATION OF OCCURRENCE:
Condenser 6T Exceeded Environmental Technical Specification Limit of 27.5°F.
CONDITIONS PRIOR TO OCCURRENCE:
Operational Mode 1 Reactor Power 95%
DESCRIPTION OF OCCURRENCE:
On 1-18-79, the computer printout of condenser operation showed the condenser maximum 6T limit of 27.5°F as specified by Environmental Technical Specification 2.l.l.b~3 had been exceeded at 2000 and 2100 hours0.0243 days <br />0.583 hours <br />0.00347 weeks <br />7.9905e-4 months <br />.
At 1839 hours0.0213 days <br />0.511 hours <br />0.00304 weeks <br />6.997395e-4 months <br /> with reactor power at 95%, five circulators in service and one circulator tagged out for maintenance, condenser 6T exceeded 16.5°F.
A power reduction was commenced to reduce condenser 6T to less than 16.5°F within the 24 hours2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br /> allowed by Environmental Tech-nical Specifications.
About this time river conditions began caus-ing intermittent suction problems for the running circulators and by approximately 2000 hours0.0231 days <br />0.556 hours <br />0.00331 weeks <br />7.61e-4 months <br />, although reactor power had been re-duced to 25%, the maximum 6T limit of 27.5°F was exceeded.
By 2158 hours0.025 days <br />0.599 hours <br />0.00357 weeks <br />8.21119e-4 months <br /> load reduction and cleaning the condenser water boxes had reduced condenser 6T to within Environmental Technical Speci-fication limits.
DESIGNATION OF APPARENT CAUSE OF OCCURRENCE:
The cause of this occurrence was an extremely low tide with high winds and low temperature causing icing problems with the circulating water screens.
During this occurrence, four of the five operating circulators had to be removed from service due to fluctuating motor amperage in-dicating intermittent loss of suction.
7902230(d-b
LER 79-10/04L 2 -
ANALYSIS OF OCCURRENCE:
Environmental Technical Specification 2.1.1.b.3 requires that in the event the maximum 6T limit of 27.5°F is exceeded, corrective action shall be taken to reduce the 6T to within specification.
Reducing reactor power from 95% to 25% and cleaning condenser tube sheets brought the condenser 6T to within specification.
CORRECTIVE ACTION:
Reactor power was promptly reduced from 95% and was already at 25%
within 10 minutes of the first computer printout which indicated a condenser 6T greater than 27.5°F.
Conde~ser tube sheets were cleaned and at 2158 condenser 6T was less than 16.5°F.
This event was due to abnormal weather conditions concurrent with an extremely low tide.
Existing administrative controls are adequate to prevent similar occurrences.
FAILURE DATA:
Not Applicable Prepared by A. W. Kapple
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SORC Meeting 9-79
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