05000237/FIN-2010003-01
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Finding | |
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| Title | High Pressure Coolant Injection (HPCI) Booster Pump Bearing Oil Levels |
| Description | The inspectors identified an unresolved item (URI) regarding the impact of HPCI booster pump bearing oil levels being outside the acceptable band on the operability of the HPCI pump.
During a walkdown of the Unit 2 HPCI system, the inspectors identified that the preferred level band indicators on the sightglasses for the HPCI booster pump inboard and outboard bearing oil reservoirs were not reliable since the indicators consisted of wires that could be slid up and down the sightglass. When informed by the inspectors, the licensee checked the indicators and identified that they do not conform to the type and position of the markings described in the HPCI booster pump maintenance procedure (MA-AB-734-448). The maintenance procedure defined the oil level band as 12 between the high and low levels. Since the sightglasses on all bearings in the field had a band of approximately 1, they were all non-conservative in at least one direction. Upon further questioning by the inspectors, the licensee measured the oil levels in each of the HPCI booster pump bearing oil level sightglasses for both Units 2 and 3. From these measurements, the inspectors identified that one oil level, the Unit 3 outboard bearing oil level, was below the low level described in the maintenance procedure. When the inspectors asked the licensee about the impact on operability of the pump with this oil level, the licensee indicated that they do not consider the oil band contained in the maintenance procedure as defining the operability of the pump, and they determined that the oil level was not low enough to consider the pump inoperable. When asked at what levels the licensee would consider the pump inoperable, licensee staff were unable to provide an answer. Further information is required from the licensee to determine whether the inaccurate oil level bands caused the oil for the bearings to be at levels such that the HPCI pump was inoperable. This is considered an URI pending further NRC review. |
| Site: | Dresden  |
|---|---|
| Report | IR 05000237/2010003 Section 1R04 |
| Date counted | Jun 30, 2010 (2010Q2) |
| Type: | URI: |
| cornerstone | Mitigating Systems |
| Identified by: | NRC identified |
| Inspection Procedure: | IP 71111.04 |
| Inspectors (proximate) | A Dunlop D Melendez-Colon W Slawinski C Phillips D Reeser B Palagi J Neurauter M Ring J Draper M Learn D Sand R Edwards R Jickling R Schulz J Tapp R Russelle Sanchezf Nestor R Jickling T Bilik D Melendez-Colon W Slawinski C Phillips M Ring T Go J Draper D Sand |
| INPO aspect | |
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Finding - Dresden - IR 05000237/2010003 | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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Finding List (Dresden) @ 2010Q2
Self-Identified List (Dresden)
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