05000324/FIN-2013003-06
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Finding | |
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| Title | Non-Conservative Calculation for Service Water Flow Rate to the Emergency Diesel Generators |
| Description | The inspectors are opening an URI to review the revision to Calculation M-89-0008, Heat Balance on DG 2 Jacket Water Service Heat Exchanger, for service water flow rate required for EDG operability during a design basis event, to determine if the performance deficiency associated with this issue is more than minor. On January 14, 2013, the licensee was performing Procedure 0ENP-2705, Service Water Heat Exchanger Thermal Performance Testing, to measure the service water flow rate to the EDG 3 jacket water heat exchanger, and found flow to be in the range of 351 to 358 gpm. The expected flow rate is 900 gpm to 1100 gpm. After visual inspection, it was determined the EDG 3 service water outlet valve 2-SW-V208 was throttled to 1-1.25 turns instead of the required 2.25 turns specified in 0OP-39, Diesel Generator Operating Procedure. Diesel 3 was determined to be operable based on Calculation M-89-0008, which required the measured service water flow rate to be above 350 gpm at an ultimate heat sink temperature of 90F. The licensee performed a past operability evaluation and determined the service water outlet valve 2-SW-V208 was out of position since April 2010. The licensee determined the maximum service water inlet temperature experienced between April 2010 and January 2013 was 89.2F on August 2, 2011 and August 6, 2012. The licensee concluded that since the inlet temperature was below 90F in 2011 and 2012, and the service water flow rate was above 350 gpm, that EDG 3 had always been operable. The inspectors reviewed Calculation M-89-0008 and determined that the calculation assumed an EDG loading of 3500 kW instead of the EDG loading of 3850 kW allowed by TS 3.8.1, AC Sources Operating, Surveillance Requirement 3.8.1.11. The inspectors determined that the failure to have an adequate calculation for service water flow rate required for EDG operability was a performance deficiency. The inspectors are opening an URI to review the revision to Calculation M-89-0008 and determine if the performance deficiency is more than minor. The licensee entered this issue in the CAP as NCR 592035. This issue is being tracked as a URI: URI 05000325/2013003-06 and 05000324/2013003-06, Non-Conservative Calculation for Service Water Flow Rate to the Emergency Diesel Generators. |
| Site: | Brunswick  |
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| Report | IR 05000324/2013003 Section 1R15 |
| Date counted | Jun 30, 2013 (2013Q2) |
| Type: | URI: |
| cornerstone | Mitigating Systems |
| Identified by: | NRC identified |
| Inspection Procedure: | IP 71111.15 |
| Inspectors (proximate) | J Laughlin M Bates M Catts M Schwieg P Lessard D Jackson G Hopper J Austin J Dodsonm Cattsm Schwieg R Taylor G Hopper J Dodson |
| INPO aspect | |
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Finding - Brunswick - IR 05000324/2013003 | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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Finding List (Brunswick) @ 2013Q2
Self-Identified List (Brunswick)
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