05000280/FIN-2008004-02
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Finding | |
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| Title | |
| Description | On February 19, 2008, charging pump 2-CH-P-1C was declared inoperable due to a high thrust bearing temperature (CR 091548) due to plugging of the TCV with silt. Fourteen (14) instances of SW silting, (five in Unit 1 and nine in Unit 2) were identified in ACE 13823 for the Unit 1 and 2 charging pump lube oil coolers and associated TCVs. Based on available information, the silting had not caused the charging pumps to become inoperable until the February, 2008 event. ACE 13823, performed due to fouling of 2-CH-E-5A (CR 102051), identified that the lowest flow velocities (1.7 ft/sec) occur in the SW lines to the charging pump lube oil coolers. During winter months, the flow rates are even lower. As a result of the low flow, silt/mud accumulates in the lube oil coolers and TCVs. The ACE stated, past corrective action dealt only with cleaning the heat exchanger rather than a permanent fix to the silting problem. ACE 13684, performed in response to fouling of 2-CH-E-5C (CR 091566), also identified low flow rates to be the cause of fouling of the TCV. Procedure PI-AA-200 (Rev. 2), Corrective Action; defines a Significant Condition Adverse to Quality (SCAQ) as: a condition Adverse to Quality that has, or if left uncorrected could have, an undesirable effect on plant safety, regulatory position, or environmental impact. It further states, because of the high regulatory or safety consequences associated with this type of condition the cause of the condition must be determined and corrective action taken to preclude repetition. Service water silting of the Unit 1 and 2 charging pump lube oil coolers and associated TCVs is a SCAQ which had an undesirable effect on plant safety and caused HHSI pump 2-CH-P-1C to be inoperable. The issues associated with the failure to take corrective action to prevent recurrence of SW silting in the charging pump lube oil coolers and TCVs is identified as an unresolved item (URI) pending additional inspection and review from the NRC. This URI is designated 05000280, 281/2008004-02, SW Silting in the Charging Pump Lube Oil Coolers and TCVs. |
| Site: | Surry  |
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| Report | IR 05000280/2008004 Section 4OA2 |
| Date counted | Sep 30, 2008 (2008Q3) |
| Type: | URI: |
| cornerstone | Mitigating Systems |
| Identified by: | NRC identified |
| Inspection Procedure: | |
| Inspectors (proximate) | J Nadel J Reece C Welch E Lea D Arnett G Mccoy R Hamilton W Loo H Gepford M Reichardr Hamiltonw Loo H Gepford J Nadel C Welch D Arnett M Reichard |
| INPO aspect | |
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Finding - Surry - IR 05000280/2008004 | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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Finding List (Surry) @ 2008Q3
Self-Identified List (Surry)
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