05000361/FIN-2008010-03
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Finding | |
|---|---|
| Title | Omission of Station Blackout Profile During Battery Service Tests |
| Description | The team identified an unresolved item (URI) associated with Technical Specification Surveillance 3.8.4.7 for omission of the SBO profile (and corresponding test duration of 240 minutes) during the battery service test. The calculation for battery size and minimum battery voltage clearly indicates that the SBO condition is more limiting than the Loss of Voltage Signal/Safety Injection Actuation Signal (LOVS/SIAS) condition. Description: Service test Procedure SO123-I-2.5 used to satisfy Technical Specification Surveillance 3.8.4.7 is based on the LOVS/SIAS profile instead of the more limiting SBO profile. The USAR, section 8.3.2.1.2.1, states that the blackout duty cycles for Batteries A and B can be met for 4 hours4.62963e-5 days <br />0.00111 hours <br />6.613757e-6 weeks <br />1.522e-6 months <br /> per Battery Sizing Calculation E4C-017. Technical Specification 3.8.4.7 requires a battery service test to verify battery capacity is adequate to supply and maintain in operable status the required emergency loads for the design duty cycle. The Institute of Electrical and Electronic Engineers (IEEE) 450-1980 requires the discharge rate and test length for the service test to correspond as closely as possible to the battery duty cycle. Calculation E4C-017 analyzed a 90 minute duty cycle for the LOV/SIAS scenario and a 4 hour4.62963e-5 days <br />0.00111 hours <br />6.613757e-6 weeks <br />1.522e-6 months <br /> duty cycle for the SBO scenario. The load profile required by procedure SO123-I-2.5 requires a discharge rate of 471 Amps for the first minute, 173 Amps for minutes 2 through 89, and 252 Amps for the last minute. The Battery 2B008 duty cycle determined in Calculation E4C-017 for the SBO scenario was 341 Amps for the first minute, 193 Amps for minutes 2 through 29 minutes, 234 Amps for the 30th minute, 155 Amps for minutes 31 through 239, and 238.95 Amps for the last minute. Although the profiles are not directly comparable, Calculation E4C-017 demonstrated that the SBO profile was the more limiting profile for battery sizing, requiring an uncorrected size of 5.01 positive plates per cell vs. 4.60 for the LOV/SIAS profile. In addition, the calculation showed that the SBO profile was more limiting with respect to minimum battery voltage with an expected minimum voltage of 106.72V for the SBO profile vs. 108.81V for the LOV/SIAS profile. The licensee initiated Notification NN 200061041 to address this issue. This issue was opened to determine if the SONGS current licensing basis requires the performance of a service test to demonstrate the capability of the batteries to complete all design duty cycles (including SBO) defined in the USAR. Pending completion of this determination by the NRC, this issue is identified as URI 05000361 and 050000362/2008010-03, Omission of Station Blackout Profile During Battery Service Tests |
| Site: | San Onofre  |
|---|---|
| Report | IR 05000361/2008010 Section 1R21 |
| Date counted | Sep 30, 2008 (2008Q3) |
| Type: | URI: |
| cornerstone | No Cornerstone |
| Identified by: | NRC identified |
| Inspection Procedure: | IP 71111.21 |
| Inspectors (proximate) | L Ellershaw J Adams C Baron G Skinner P Gage R Bywater M Bloodgood D Reinertk Claytonr Lantz J Reynoso J Laughlin G Warnick B Parks M Young B Correll S Achen |
| INPO aspect | |
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Finding - San Onofre - IR 05000361/2008010 | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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Finding List (San Onofre) @ 2008Q3
Self-Identified List (San Onofre)
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